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Jetpack/kernel/nvidia/drivers/input/touchscreen/atmel_mxt_ts_nv.c

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/*
* Atmel maXTouch Touchscreen driver
*
* Copyright (C) 2010 Samsung Electronics Co.Ltd
* Copyright (C) 2011-2014 Atmel Corporation
* Copyright (C) 2012 Google, Inc.
* Copyright (C) 2011-2017, NVIDIA CORPORATION. All rights reserved.
*
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/platform_data/atmel_mxt_ts_nv.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
/* Configuration file */
#define MXT_CFG_MAGIC "OBP_RAW V1"
/* Registers */
#define MXT_OBJECT_START 0x07
#define MXT_OBJECT_SIZE 6
#define MXT_INFO_CHECKSUM_SIZE 3
#define MXT_MAX_BLOCK_WRITE 255
/* Object types */
#define MXT_DEBUG_DIAGNOSTIC_T37 37
#define MXT_GEN_MESSAGE_T5 5
#define MXT_GEN_COMMAND_T6 6
#define MXT_GEN_POWER_T7 7
#define MXT_GEN_ACQUIRE_T8 8
#define MXT_GEN_DATASOURCE_T53 53
#define MXT_TOUCH_MULTI_T9 9
#define MXT_TOUCH_KEYARRAY_T15 15
#define MXT_TOUCH_PROXIMITY_T23 23
#define MXT_TOUCH_PROXKEY_T52 52
#define MXT_PROCI_GRIPFACE_T20 20
#define MXT_PROCG_NOISE_T22 22
#define MXT_PROCI_ONETOUCH_T24 24
#define MXT_PROCI_TWOTOUCH_T27 27
#define MXT_PROCI_GRIP_T40 40
#define MXT_PROCI_PALM_T41 41
#define MXT_PROCI_TOUCHSUPPRESSION_T42 42
#define MXT_PROCI_STYLUS_T47 47
#define MXT_PROCG_NOISESUPPRESSION_T48 48
#define MXT_SPT_COMMSCONFIG_T18 18
#define MXT_SPT_GPIOPWM_T19 19
#define MXT_SPT_SELFTEST_T25 25
#define MXT_SPT_CTECONFIG_T28 28
#define MXT_SPT_USERDATA_T38 38
#define MXT_SPT_DIGITIZER_T43 43
#define MXT_SPT_MESSAGECOUNT_T44 44
#define MXT_SPT_CTECONFIG_T46 46
#define MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71 71
#define MXT_PROCI_SYMBOLGESTUREPROCESSOR 92
#define MXT_PROCI_TOUCHSEQUENCELOGGER 93
#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
#define MXT_PROCI_ACTIVESTYLUS_T107 107
/* MXT_GEN_MESSAGE_T5 object */
#define MXT_RPTID_NOMSG 0xff
/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET 0
#define MXT_COMMAND_BACKUPNV 1
#define MXT_COMMAND_CALIBRATE 2
#define MXT_COMMAND_REPORTALL 3
#define MXT_COMMAND_DIAGNOSTIC 5
/* Define for T6 status byte */
#define MXT_T6_STATUS_RESET BIT(7)
#define MXT_T6_STATUS_OFL BIT(6)
#define MXT_T6_STATUS_SIGERR BIT(5)
#define MXT_T6_STATUS_CAL BIT(4)
#define MXT_T6_STATUS_CFGERR BIT(3)
#define MXT_T6_STATUS_COMSERR BIT(2)
/* MXT_GEN_POWER_T7 field */
struct t7_config {
u8 idle;
u8 active;
} __packed;
#define MXT_POWER_CFG_RUN 0
#define MXT_POWER_CFG_DEEPSLEEP 1
/* MXT_TOUCH_MULTI_T9 field */
#define MXT_T9_CTRL 0
#define MXT_T9_ORIENT 9
#define MXT_T9_RANGE 18
/* MXT_TOUCH_MULTI_T9 status */
#define MXT_T9_UNGRIP BIT(0)
#define MXT_T9_SUPPRESS BIT(1)
#define MXT_T9_AMP BIT(2)
#define MXT_T9_VECTOR BIT(3)
#define MXT_T9_MOVE BIT(4)
#define MXT_T9_RELEASE BIT(5)
#define MXT_T9_PRESS BIT(6)
#define MXT_T9_DETECT BIT(7)
struct t9_range {
__le16 x;
__le16 y;
} __packed;
/* MXT_TOUCH_MULTI_T9 orient */
#define MXT_T9_ORIENT_SWITCH BIT(0)
/* MXT_SPT_COMMSCONFIG_T18 */
#define MXT_COMMS_CTRL 0
#define MXT_COMMS_CMD 1
#define MXT_COMMS_RETRIGEN BIT(6)
/* Define for MXT_GEN_COMMAND_T6 */
#define MXT_BOOT_VALUE 0xa5
#define MXT_RESET_VALUE 0x01
#define MXT_BACKUP_VALUE 0x55
/* Define for MXT_PROCI_TOUCHSUPPRESSION_T42 */
#define MXT_T42_MSG_TCHSUP BIT(0)
/* T100 Multiple Touch Touchscreen */
#define MXT_T100_CTRL 0
#define MXT_T100_CFG1 1
#define MXT_T100_TCHAUX 3
#define MXT_T100_XRANGE 13
#define MXT_T100_YRANGE 24
#define MXT_T100_CFG_SWITCHXY BIT(5)
#define MXT_T100_TCHAUX_VECT BIT(0)
#define MXT_T100_TCHAUX_AMPL BIT(1)
#define MXT_T100_TCHAUX_AREA BIT(2)
#define MXT_T100_DETECT BIT(7)
#define MXT_T100_TYPE_MASK 0x70
enum t100_type {
MXT_T100_TYPE_FINGER = 1,
MXT_T100_TYPE_PASSIVE_STYLUS = 2,
MXT_T100_TYPE_ACTIVE_STYLUS = 3,
MXT_T100_TYPE_HOVERING_FINGER = 4,
MXT_T100_TYPE_GLOVE = 5,
MXT_T100_TYPE_LARGE_TOUCH = 6,
};
#define MXT_DISTANCE_ACTIVE_TOUCH 0
#define MXT_DISTANCE_HOVERING 1
#define MXT_TOUCH_MAJOR_DEFAULT 1
#define MXT_PRESSURE_DEFAULT 1
/* Gen2 Active Stylus */
#define MXT_T107_STYLUS_STYAUX 42
#define MXT_T107_STYLUS_STYAUX_PRESSURE BIT(0)
#define MXT_T107_STYLUS_STYAUX_PEAK BIT(4)
#define MXT_T107_STYLUS_HOVER BIT(0)
#define MXT_T107_STYLUS_TIPSWITCH BIT(1)
#define MXT_T107_STYLUS_BUTTON0 BIT(2)
#define MXT_T107_STYLUS_BUTTON1 BIT(3)
/* Delay times */
#define MXT_BACKUP_TIME 50 /* msec */
#define MXT_RESET_TIME 200 /* msec */
#define MXT_RESET_TIMEOUT 3000 /* msec */
#define MXT_CRC_TIMEOUT 1000 /* msec */
#define MXT_FW_RESET_TIME 3000 /* msec */
#define MXT_FW_CHG_TIMEOUT 300 /* msec */
#define MXT_WAKEUP_TIME 25 /* msec */
#define MXT_REGULATOR_DELAY 150 /* msec */
#define MXT_CHG_DELAY 100 /* msec */
#define MXT_POWERON_DELAY 150 /* msec */
#define MXT_BOOTLOADER_WAIT 36E5 /* 1 minute */
/* Command to unlock bootloader */
#define MXT_UNLOCK_CMD_MSB 0xaa
#define MXT_UNLOCK_CMD_LSB 0xdc
/* Bootloader mode status */
#define MXT_WAITING_BOOTLOAD_CMD 0xc0 /* valid 7 6 bit only */
#define MXT_WAITING_FRAME_DATA 0x80 /* valid 7 6 bit only */
#define MXT_FRAME_CRC_CHECK 0x02
#define MXT_FRAME_CRC_FAIL 0x03
#define MXT_FRAME_CRC_PASS 0x04
#define MXT_APP_CRC_FAIL 0x40 /* valid 7 8 bit only */
#define MXT_BOOT_STATUS_MASK 0x3f
#define MXT_BOOT_EXTENDED_ID BIT(5)
#define MXT_BOOT_ID_MASK 0x1f
/* Touchscreen absolute values */
#define MXT_MAX_AREA 0xff
#define MXT_PIXELS_PER_MM 20
#define DEBUG_MSG_MAX 200
struct mxt_info {
u8 family_id;
u8 variant_id;
u8 version;
u8 build;
u8 matrix_xsize;
u8 matrix_ysize;
u8 object_num;
};
struct mxt_object {
u8 type;
u16 start_address;
u8 size_minus_one;
u8 instances_minus_one;
u8 num_report_ids;
} __packed;
/* Firmware frame structure */
struct mxt_fw_frame {
__be16 size;
u8 data[];
};
/* Config update context */
struct mxt_cfg {
u8 *raw;
size_t raw_size;
off_t raw_pos;
u8 *mem;
size_t mem_size;
int start_ofs;
struct mxt_info info;
};
/* Firmware update context */
struct mxt_flash {
struct mxt_data *data;
const struct firmware *fw;
struct mxt_fw_frame *frame;
loff_t pos;
size_t frame_size;
unsigned int count;
unsigned int retry;
u8 previous;
struct completion flash_completion;
struct delayed_work work;
};
/* Each client has this additional data */
struct mxt_data {
struct i2c_client *client;
struct input_dev *input_dev;
char phys[64]; /* device physical location */
const struct mxt_platform_data *pdata;
struct mxt_object *object_table;
struct mxt_info *info;
void *raw_info_block;
unsigned int irq;
unsigned int max_x;
unsigned int max_y;
bool xy_switch;
bool in_bootloader;
u16 mem_size;
u8 t100_aux_ampl;
u8 t100_aux_area;
u8 t100_aux_vect;
struct bin_attribute mem_access_attr;
bool debug_enabled;
bool debug_v2_enabled;
u8 *debug_msg_data;
u16 debug_msg_count;
struct bin_attribute debug_msg_attr;
struct mutex debug_msg_lock;
u8 max_reportid;
u32 config_crc;
u32 info_crc;
u8 bootloader_addr;
u8 *msg_buf;
u8 t6_status;
bool update_input;
u8 last_message_count;
u8 num_touchids;
u8 multitouch;
struct t7_config t7_cfg;
unsigned long t15_keystatus;
u8 stylus_aux_pressure;
u8 stylus_aux_peak;
bool use_retrigen_workaround;
struct regulator *reg_vdd;
struct regulator *reg_avdd;
char *fw_name;
char *cfg_name;
struct mxt_flash *flash;
/* Cached parameters from object table */
u16 T5_address;
u8 T5_msg_size;
u8 T6_reportid;
u16 T6_address;
u16 T7_address;
u16 T71_address;
u8 T9_reportid_min;
u8 T9_reportid_max;
u8 T15_reportid_min;
u8 T15_reportid_max;
u16 T18_address;
u8 T19_reportid;
u8 T42_reportid_min;
u8 T42_reportid_max;
u16 T44_address;
u8 T48_reportid;
u16 T92_address;
u8 T92_reportid;
u16 T93_address;
u8 T93_reportid;
u8 T100_reportid_min;
u8 T100_reportid_max;
u16 T107_address;
/* for reset handling */
struct completion reset_completion;
/* for config update handling */
struct completion crc_completion;
/* for power up handling */
struct completion chg_completion;
/* Indicates whether device is in suspend */
bool suspended;
/* Indicates whether device is updating configuration */
bool updating_config;
/* Indicates whether device is initialized */
bool initialized;
};
static size_t mxt_obj_size(const struct mxt_object *obj)
{
return obj->size_minus_one + 1;
}
static size_t mxt_obj_instances(const struct mxt_object *obj)
{
return obj->instances_minus_one + 1;
}
static bool mxt_object_readable(unsigned int type)
{
switch (type) {
case MXT_GEN_COMMAND_T6:
case MXT_GEN_POWER_T7:
case MXT_GEN_ACQUIRE_T8:
case MXT_GEN_DATASOURCE_T53:
case MXT_TOUCH_MULTI_T9:
case MXT_TOUCH_KEYARRAY_T15:
case MXT_TOUCH_PROXIMITY_T23:
case MXT_TOUCH_PROXKEY_T52:
case MXT_PROCI_GRIPFACE_T20:
case MXT_PROCG_NOISE_T22:
case MXT_PROCI_ONETOUCH_T24:
case MXT_PROCI_TWOTOUCH_T27:
case MXT_PROCI_GRIP_T40:
case MXT_PROCI_PALM_T41:
case MXT_PROCI_TOUCHSUPPRESSION_T42:
case MXT_PROCI_STYLUS_T47:
case MXT_PROCG_NOISESUPPRESSION_T48:
case MXT_SPT_COMMSCONFIG_T18:
case MXT_SPT_GPIOPWM_T19:
case MXT_SPT_SELFTEST_T25:
case MXT_SPT_CTECONFIG_T28:
case MXT_SPT_USERDATA_T38:
case MXT_SPT_DIGITIZER_T43:
case MXT_SPT_CTECONFIG_T46:
case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
return true;
default:
return false;
}
}
static void mxt_dump_message(struct mxt_data *data, u8 *message)
{
dev_dbg(&data->client->dev, "MXT MSG: %*ph\n",
data->T5_msg_size, message);
}
static void mxt_debug_msg_enable(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
if (data->debug_v2_enabled)
return;
mutex_lock(&data->debug_msg_lock);
data->debug_msg_data = kcalloc(DEBUG_MSG_MAX,
data->T5_msg_size, GFP_KERNEL);
if (!data->debug_msg_data)
return;
data->debug_v2_enabled = true;
mutex_unlock(&data->debug_msg_lock);
dev_dbg(dev, "Enabled message output\n");
}
static void mxt_debug_msg_disable(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
if (!data->debug_v2_enabled)
return;
data->debug_v2_enabled = false;
mutex_lock(&data->debug_msg_lock);
kfree(data->debug_msg_data);
data->debug_msg_data = NULL;
data->debug_msg_count = 0;
mutex_unlock(&data->debug_msg_lock);
dev_dbg(dev, "Disabled message output\n");
}
static void mxt_debug_msg_add(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
mutex_lock(&data->debug_msg_lock);
if (!data->debug_msg_data) {
dev_err(dev, "No buffer!\n");
return;
}
if (data->debug_msg_count < DEBUG_MSG_MAX) {
memcpy(data->debug_msg_data +
data->debug_msg_count * data->T5_msg_size,
msg,
data->T5_msg_size);
data->debug_msg_count++;
} else {
dev_dbg(dev, "Discarding %u messages\n", data->debug_msg_count);
data->debug_msg_count = 0;
}
mutex_unlock(&data->debug_msg_lock);
sysfs_notify(&data->client->dev.kobj, NULL, "debug_notify");
}
static ssize_t mxt_debug_msg_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf, loff_t off,
size_t count)
{
return -EIO;
}
static ssize_t mxt_debug_msg_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf, loff_t off, size_t bytes)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct mxt_data *data = dev_get_drvdata(dev);
size_t count;
size_t bytes_read;
if (!data->debug_msg_data) {
dev_err(dev, "No buffer!\n");
return 0;
}
count = bytes / data->T5_msg_size;
if (count > DEBUG_MSG_MAX)
count = DEBUG_MSG_MAX;
mutex_lock(&data->debug_msg_lock);
if (count > data->debug_msg_count)
count = data->debug_msg_count;
bytes_read = count * data->T5_msg_size;
memcpy(buf, data->debug_msg_data, bytes_read);
data->debug_msg_count = 0;
mutex_unlock(&data->debug_msg_lock);
return bytes_read;
}
static int mxt_debug_msg_init(struct mxt_data *data)
{
sysfs_bin_attr_init(&data->debug_msg_attr);
data->debug_msg_attr.attr.name = "debug_msg";
data->debug_msg_attr.attr.mode = 0666;
data->debug_msg_attr.read = mxt_debug_msg_read;
data->debug_msg_attr.write = mxt_debug_msg_write;
data->debug_msg_attr.size = data->T5_msg_size * DEBUG_MSG_MAX;
if (sysfs_create_bin_file(&data->client->dev.kobj,
&data->debug_msg_attr) < 0) {
dev_err(&data->client->dev, "Failed to create %s\n",
data->debug_msg_attr.attr.name);
return -EINVAL;
}
return 0;
}
static void mxt_debug_msg_remove(struct mxt_data *data)
{
if (data->debug_msg_attr.attr.name)
sysfs_remove_bin_file(&data->client->dev.kobj,
&data->debug_msg_attr);
}
static int mxt_wait_for_completion(struct mxt_data *data,
struct completion *comp,
unsigned int timeout_ms)
{
struct device *dev = &data->client->dev;
unsigned long timeout = msecs_to_jiffies(timeout_ms);
long ret;
ret = wait_for_completion_interruptible_timeout(comp, timeout);
if (ret < 0) {
return ret;
} else if (ret == 0) {
dev_err(dev, "Wait for completion timed out.\n");
return -ETIMEDOUT;
}
return 0;
}
static int mxt_bootloader_read(struct mxt_data *data,
u8 *val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.flags |= I2C_M_RD;
msg.len = count;
msg.buf = val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_bootloader_write(struct mxt_data *data,
const u8 * const val, unsigned int count)
{
int ret;
struct i2c_msg msg;
msg.addr = data->bootloader_addr;
msg.flags = data->client->flags & I2C_M_TEN;
msg.len = count;
msg.buf = (u8 *)val;
ret = i2c_transfer(data->client->adapter, &msg, 1);
if (ret == 1) {
ret = 0;
} else {
ret = ret < 0 ? ret : -EIO;
dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
}
return ret;
}
static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
{
u8 appmode = data->client->addr;
u8 bootloader;
u8 family_id = data->info ? data->info->family_id : 0;
switch (appmode) {
case 0x4a:
case 0x4b:
/* Chips after 1664S use different scheme */
if (retry || family_id >= 0xa2) {
bootloader = appmode - 0x24;
break;
}
/* Fall through for normal case */
case 0x4c:
case 0x4d:
case 0x5a:
case 0x5b:
bootloader = appmode - 0x26;
break;
default:
dev_err(&data->client->dev,
"Appmode i2c address 0x%02x not found\n",
appmode);
return -EINVAL;
}
data->bootloader_addr = bootloader;
return 0;
}
static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
{
struct device *dev = &data->client->dev;
int error;
u8 buf[3];
bool crc_failure, extended_id;
error = mxt_lookup_bootloader_address(data, alt_address);
if (error)
return error;
/* Check bootloader status and version information */
error = mxt_bootloader_read(data, buf, sizeof(buf));
if (error)
return error;
crc_failure = (buf[0] & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
extended_id = buf[0] & MXT_BOOT_EXTENDED_ID;
dev_info(dev, "Found bootloader addr:%02x ID:%u%s%u%s\n",
data->bootloader_addr,
extended_id ? (buf[1] & MXT_BOOT_ID_MASK) : buf[0],
extended_id ? " version:" : "",
extended_id ? buf[2] : 0,
crc_failure ? ", APP_CRC_FAIL" : "");
return 0;
}
static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock);
static int mxt_write_firmware_frame(struct mxt_data *data, struct mxt_flash *f)
{
f->frame = (struct mxt_fw_frame *)(f->fw->data + f->pos);
/* Take account of CRC bytes */
f->frame_size = __be16_to_cpu(f->frame->size) + 2U;
/* Write one frame to device */
return mxt_bootloader_write(data, f->fw->data + f->pos,
f->frame_size);
}
static int mxt_check_bootloader(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
struct mxt_flash *f = data->flash;
u8 state;
int ret;
/* Handle interrupt after download/flash process */
if (f->pos >= f->fw->size) {
complete(&f->flash_completion);
return 0;
}
ret = mxt_bootloader_read(data, &state, 1);
if (ret)
return ret;
/* Remove don't care bits */
if (state & ~MXT_BOOT_STATUS_MASK)
state &= ~MXT_BOOT_STATUS_MASK;
switch (state) {
case MXT_WAITING_BOOTLOAD_CMD:
dev_info(dev, "Unlocking bootloader\n");
ret = mxt_send_bootloader_cmd(data, true);
if (ret)
return ret;
break;
case MXT_WAITING_FRAME_DATA:
if ((f->previous != MXT_WAITING_BOOTLOAD_CMD)
&& (f->previous != MXT_FRAME_CRC_PASS)
&& (f->previous != MXT_FRAME_CRC_FAIL))
goto unexpected;
ret = mxt_write_firmware_frame(data, f);
if (ret)
return ret;
break;
case MXT_FRAME_CRC_CHECK:
if (f->previous != MXT_WAITING_FRAME_DATA)
goto unexpected;
break;
case MXT_FRAME_CRC_PASS:
if (f->previous != MXT_FRAME_CRC_CHECK)
goto unexpected;
/* Next frame */
f->retry = 0;
f->pos += f->frame_size;
f->count++;
if (f->pos >= f->fw->size)
dev_info(dev, "Sent %u frames, %zu bytes\n",
f->count, f->fw->size);
else if (f->count % 50 == 0)
dev_dbg(dev, "Sent %u frames, %lld/%zu bytes\n",
f->count, f->pos, f->fw->size);
break;
case MXT_FRAME_CRC_FAIL:
if (f->retry > 20) {
dev_err(dev, "Retry count exceeded\n");
return -EIO;
}
/* Back off by 20ms per retry */
dev_dbg(dev, "Bootloader frame CRC failure\n");
f->retry++;
msleep(f->retry * 20);
break;
default:
return -EINVAL;
}
f->previous = state;
/* Poll after 0.1s if no interrupt received */
schedule_delayed_work(&f->work, HZ / 10);
return 0;
unexpected:
dev_err(dev, "Unexpected state transition\n");
return -EINVAL;
}
int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
{
int ret;
u8 buf[2];
if (unlock) {
buf[0] = MXT_UNLOCK_CMD_LSB;
buf[1] = MXT_UNLOCK_CMD_MSB;
} else {
buf[0] = 0x01;
buf[1] = 0x01;
}
ret = mxt_bootloader_write(data, buf, 2);
if (ret)
return ret;
return 0;
}
static int __mxt_read_reg(struct i2c_client *client,
u16 reg, u16 len, void *val)
{
struct i2c_msg xfer[2];
u8 buf[2];
int ret;
bool retry = false;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 2;
xfer[0].buf = buf;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = len;
xfer[1].buf = val;
retry_read:
ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer));
if (ret != ARRAY_SIZE(xfer)) {
if (!retry) {
dev_dbg(&client->dev, "%s: i2c retry\n", __func__);
msleep(MXT_WAKEUP_TIME);
retry = true;
goto retry_read;
} else {
dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
__func__, ret);
return -EIO;
}
}
return 0;
}
static int mxt_read_blks(struct mxt_data *data, u16 start, u16 count, u8 *buf)
{
u16 offset = 0;
int error;
u16 size;
while (offset < count) {
size = min(MXT_MAX_BLOCK_WRITE, count - offset);
error = __mxt_read_reg(data->client,
start + offset,
size, buf + offset);
if (error)
return error;
offset += size;
}
return 0;
}
static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
const void *val)
{
u8 *buf;
size_t count;
int ret;
bool retry = false;
count = len + 2;
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf[0] = reg & 0xff;
buf[1] = (reg >> 8) & 0xff;
memcpy(&buf[2], val, len);
retry_write:
ret = i2c_master_send(client, buf, count);
if (ret != count) {
if (!retry) {
dev_dbg(&client->dev, "%s: i2c retry\n", __func__);
msleep(MXT_WAKEUP_TIME);
retry = true;
goto retry_write;
} else {
dev_err(&client->dev, "%s: i2c send failed (%d)\n",
__func__, ret);
ret = -EIO;
}
} else {
ret = 0;
}
kfree(buf);
return ret;
}
static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
{
return __mxt_write_reg(client, reg, 1, &val);
}
static struct mxt_object *
mxt_get_object(struct mxt_data *data, u8 type)
{
struct mxt_object *object;
int i;
for (i = 0; i < data->info->object_num; i++) {
object = data->object_table + i;
if (object->type == type)
return object;
}
dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
return NULL;
}
static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
if (crc != data->config_crc) {
data->config_crc = crc;
dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
}
complete(&data->crc_completion);
/* Detect reset */
if (status & MXT_T6_STATUS_RESET)
complete(&data->reset_completion);
/* Output debug if status has changed */
if (status != data->t6_status)
dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
status,
status == 0 ? " OK" : "",
status & MXT_T6_STATUS_RESET ? " RESET" : "",
status & MXT_T6_STATUS_OFL ? " OFL" : "",
status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
status & MXT_T6_STATUS_CAL ? " CAL" : "",
status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
/* Save current status */
data->t6_status = status;
}
static int mxt_write_object(struct mxt_data *data,
u8 type, u8 offset, u8 val)
{
struct mxt_object *object;
u16 reg;
object = mxt_get_object(data, type);
if (!object || offset >= mxt_obj_size(object))
return -EINVAL;
reg = object->start_address;
return mxt_write_reg(data->client, reg + offset, val);
}
static void mxt_input_button(struct mxt_data *data, u8 *message)
{
struct input_dev *input = data->input_dev;
const struct mxt_platform_data *pdata = data->pdata;
int i;
for (i = 0; i < pdata->t19_num_keys; i++) {
if (pdata->t19_keymap[i] == KEY_RESERVED)
continue;
/* Active-low switch */
input_report_key(input, pdata->t19_keymap[i],
!(message[1] & BIT(i)));
}
}
static void mxt_input_sync(struct mxt_data *data)
{
if (data->input_dev) {
input_mt_report_pointer_emulation(data->input_dev,
data->pdata->t19_num_keys);
input_sync(data->input_dev);
}
}
static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev = data->input_dev;
int id;
u8 status;
int x;
int y;
int area;
int amplitude;
u8 vector;
int tool;
id = message[0] - data->T9_reportid_min;
status = message[1];
x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
y = (message[3] << 4) | ((message[4] & 0xf));
/* Handle 10/12 bit switching */
if (data->max_x < 1024)
x >>= 2;
if (data->max_y < 1024)
y >>= 2;
area = message[5];
amplitude = message[6];
vector = message[7];
dev_dbg(dev,
"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u vector: %02X\n",
id,
(status & MXT_T9_DETECT) ? 'D' : '.',
(status & MXT_T9_PRESS) ? 'P' : '.',
(status & MXT_T9_RELEASE) ? 'R' : '.',
(status & MXT_T9_MOVE) ? 'M' : '.',
(status & MXT_T9_VECTOR) ? 'V' : '.',
(status & MXT_T9_AMP) ? 'A' : '.',
(status & MXT_T9_SUPPRESS) ? 'S' : '.',
(status & MXT_T9_UNGRIP) ? 'U' : '.',
x, y, area, amplitude, vector);
input_mt_slot(input_dev, id);
if (status & MXT_T9_DETECT) {
/*
* Multiple bits may be set if the host is slow to read
* the status messages, indicating all the events that
* have happened.
*/
if (status & MXT_T9_RELEASE) {
input_mt_report_slot_state(input_dev, 0, 0);
mxt_input_sync(data);
}
/* A size of zero indicates touch is from a linked T47 Stylus */
if (area == 0) {
area = MXT_TOUCH_MAJOR_DEFAULT;
tool = MT_TOOL_PEN;
} else {
tool = MT_TOOL_FINGER;
}
/* if active, pressure must be non-zero */
if (!amplitude)
amplitude = MXT_PRESSURE_DEFAULT;
/* Touch active */
input_mt_report_slot_state(input_dev, tool, 1);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
input_report_abs(input_dev, ABS_MT_ORIENTATION, vector);
} else {
/* Touch no longer active, close out slot */
input_mt_report_slot_state(input_dev, 0, 0);
}
data->update_input = true;
}
static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
{
struct device *dev = &data->client->dev;
struct input_dev *input_dev = data->input_dev;
int id;
u8 status;
u8 type = 0;
u16 x;
u16 y;
int distance = 0;
int tool = 0;
u8 major = 0;
u8 pressure = 0;
u8 orientation = 0;
bool active = false;
bool hover = false;
id = message[0] - data->T100_reportid_min - 2;
/* ignore SCRSTATUS events */
if (id < 0)
return;
status = message[1];
x = get_unaligned_le16(&message[2]);
y = get_unaligned_le16(&message[4]);
if (status & MXT_T100_DETECT) {
type = (status & MXT_T100_TYPE_MASK) >> 4;
switch (type) {
case MXT_T100_TYPE_HOVERING_FINGER:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_HOVERING;
hover = true;
active = true;
break;
case MXT_T100_TYPE_FINGER:
case MXT_T100_TYPE_GLOVE:
tool = MT_TOOL_FINGER;
distance = MXT_DISTANCE_ACTIVE_TOUCH;
hover = false;
active = true;
if (data->t100_aux_area)
major = message[data->t100_aux_area];
if (data->t100_aux_ampl)
pressure = message[data->t100_aux_ampl];
if (data->t100_aux_vect)
orientation = message[data->t100_aux_vect];
break;
case MXT_T100_TYPE_PASSIVE_STYLUS:
tool = MT_TOOL_PEN;
distance = MXT_DISTANCE_ACTIVE_TOUCH;
hover = false;
active = true;
/*
* Passive stylus is reported with size zero so
* hardcode.
*/
major = MXT_TOUCH_MAJOR_DEFAULT;
if (data->t100_aux_ampl)
pressure = message[data->t100_aux_ampl];
break;
case MXT_T100_TYPE_ACTIVE_STYLUS:
/* Report input buttons */
input_report_key(input_dev, BTN_STYLUS,
message[6] & MXT_T107_STYLUS_BUTTON0);
input_report_key(input_dev, BTN_STYLUS2,
message[6] & MXT_T107_STYLUS_BUTTON1);
/* stylus in range, but position unavailable */
if (!(message[6] & MXT_T107_STYLUS_HOVER))
break;
tool = MT_TOOL_PEN;
distance = MXT_DISTANCE_ACTIVE_TOUCH;
active = true;
major = MXT_TOUCH_MAJOR_DEFAULT;
if (!(message[6] & MXT_T107_STYLUS_TIPSWITCH)) {
hover = true;
distance = MXT_DISTANCE_HOVERING;
} else if (data->stylus_aux_pressure) {
pressure = message[data->stylus_aux_pressure];
}
break;
case MXT_T100_TYPE_LARGE_TOUCH:
/* Ignore suppressed touch */
break;
default:
dev_dbg(dev, "Unexpected T100 type\n");
return;
}
}
/*
* Values reported should be non-zero if tool is touching the
* device
*/
if (!pressure && !hover)
pressure = MXT_PRESSURE_DEFAULT;
input_mt_slot(input_dev, id);
if (active) {
dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
id, type, x, y, major, pressure, orientation);
input_mt_report_slot_state(input_dev, tool, 1);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, major);
input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
} else {
dev_dbg(dev, "[%u] release\n", id);
/* close out slot */
input_mt_report_slot_state(input_dev, 0, 0);
}
data->update_input = true;
}
static void mxt_proc_t15_messages(struct mxt_data *data, u8 *msg)
{
struct input_dev *input_dev = data->input_dev;
struct device *dev = &data->client->dev;
int key;
bool curr_state, new_state;
bool sync = false;
unsigned long keystates = le32_to_cpu(msg[2]);
for (key = 0; key < data->pdata->t15_num_keys; key++) {
curr_state = test_bit(key, &data->t15_keystatus);
new_state = test_bit(key, &keystates);
if (!curr_state && new_state) {
dev_dbg(dev, "T15 key press: %u\n", key);
__set_bit(key, &data->t15_keystatus);
input_event(input_dev, EV_KEY,
data->pdata->t15_keymap[key], 1);
sync = true;
} else if (curr_state && !new_state) {
dev_dbg(dev, "T15 key release: %u\n", key);
__clear_bit(key, &data->t15_keystatus);
input_event(input_dev, EV_KEY,
data->pdata->t15_keymap[key], 0);
sync = true;
}
}
if (sync)
input_sync(input_dev);
}
static void mxt_proc_t42_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
if (status & MXT_T42_MSG_TCHSUP)
dev_info(dev, "T42 suppress\n");
else
dev_info(dev, "T42 normal\n");
}
static int mxt_proc_t48_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status, state;
status = msg[1];
state = msg[4];
dev_dbg(dev, "T48 state %d status %02X %s%s%s%s%s\n", state, status,
status & 0x01 ? "FREQCHG " : "",
status & 0x02 ? "APXCHG " : "",
status & 0x04 ? "ALGOERR " : "",
status & 0x10 ? "STATCHG " : "",
status & 0x20 ? "NLVLCHG " : "");
return 0;
}
static void mxt_proc_t92_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
dev_info(dev, "T92 long stroke LSTR=%d %d\n",
(status & 0x80) ? 1 : 0,
status & 0x0F);
}
static void mxt_proc_t93_messages(struct mxt_data *data, u8 *msg)
{
struct device *dev = &data->client->dev;
u8 status = msg[1];
dev_info(dev, "T93 report double tap %d\n", status);
}
static int mxt_proc_message(struct mxt_data *data, u8 *message)
{
u8 report_id = message[0];
bool dump = data->debug_enabled;
if (report_id == MXT_RPTID_NOMSG)
return 0;
if (report_id == data->T6_reportid) {
mxt_proc_t6_messages(data, message);
} else if (report_id >= data->T42_reportid_min
&& report_id <= data->T42_reportid_max) {
mxt_proc_t42_messages(data, message);
} else if (report_id == data->T48_reportid) {
mxt_proc_t48_messages(data, message);
} else if (!data->input_dev || data->suspended) {
/*
* Do not report events if input device is not
* yet registered or returning from suspend
*/
mxt_dump_message(data, message);
} else if (report_id >= data->T9_reportid_min &&
report_id <= data->T9_reportid_max) {
mxt_proc_t9_message(data, message);
} else if (report_id >= data->T100_reportid_min &&
report_id <= data->T100_reportid_max) {
mxt_proc_t100_message(data, message);
} else if (report_id == data->T19_reportid) {
mxt_input_button(data, message);
data->update_input = true;
} else if (report_id >= data->T15_reportid_min
&& report_id <= data->T15_reportid_max) {
mxt_proc_t15_messages(data, message);
} else if (report_id == data->T92_reportid) {
mxt_proc_t92_messages(data, message);
} else if (report_id == data->T93_reportid) {
mxt_proc_t93_messages(data, message);
} else {
dump = true;
}
if (dump)
mxt_dump_message(data, message);
if (data->debug_v2_enabled)
mxt_debug_msg_add(data, message);
return 1;
}
static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
{
struct device *dev = &data->client->dev;
int ret;
int i;
u8 num_valid = 0;
/* Safety check for msg_buf */
if (count > data->max_reportid)
return -EINVAL;
/* Process remaining messages if necessary */
ret = __mxt_read_reg(data->client, data->T5_address,
data->T5_msg_size * count, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
return ret;
}
for (i = 0; i < count; i++) {
ret = mxt_proc_message(data,
data->msg_buf + data->T5_msg_size * i);
if (ret == 1)
num_valid++;
}
/* return number of messages read */
return num_valid;
}
static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret;
u8 count, num_left;
/* Read T44 and T5 together */
ret = __mxt_read_reg(data->client, data->T44_address,
data->T5_msg_size + 1, data->msg_buf);
if (ret) {
dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
return IRQ_NONE;
}
count = data->msg_buf[0];
/*
* This condition may be caused by the CHG line being configured in
* Mode 0. It results in unnecessary I2C operations but it is benign.
*/
if (count == 0)
return IRQ_NONE;
if (count > data->max_reportid) {
dev_warn(dev, "T44 count %d exceeded max report id\n", count);
count = data->max_reportid;
}
/* Process first message */
ret = mxt_proc_message(data, data->msg_buf + 1);
if (ret < 0) {
dev_warn(dev, "Unexpected invalid message\n");
return IRQ_NONE;
}
num_left = count - 1;
/* Process remaining messages if necessary */
if (num_left) {
ret = mxt_read_and_process_messages(data, num_left);
if (ret < 0)
goto end;
else if (ret != num_left)
dev_warn(dev, "Unexpected invalid message\n");
}
end:
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static int mxt_process_messages_until_invalid(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int count, read;
u8 tries = 2;
count = data->max_reportid;
/* Read messages until we force an invalid */
do {
read = mxt_read_and_process_messages(data, count);
if (read < count)
return 0;
} while (--tries);
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
dev_err(dev, "CHG pin isn't cleared\n");
return -EBUSY;
}
static irqreturn_t mxt_process_messages(struct mxt_data *data)
{
int total_handled, num_handled;
u8 count = data->last_message_count;
if (count < 1 || count > data->max_reportid)
count = 1;
/* include final invalid message */
total_handled = mxt_read_and_process_messages(data, count + 1);
if (total_handled < 0)
return IRQ_NONE;
/* if there were invalid messages, then we are done */
else if (total_handled <= count)
goto update_count;
/* keep reading two msgs until one is invalid or reportid limit */
do {
num_handled = mxt_read_and_process_messages(data, 2);
if (num_handled < 0)
return IRQ_NONE;
total_handled += num_handled;
if (num_handled < 2)
break;
} while (total_handled < data->num_touchids);
update_count:
data->last_message_count = total_handled;
if (data->update_input) {
mxt_input_sync(data);
data->update_input = false;
}
return IRQ_HANDLED;
}
static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
struct mxt_data *data = dev_id;
complete(&data->chg_completion);
if (data->in_bootloader) {
if (data->flash)
cancel_delayed_work_sync(&data->flash->work);
return IRQ_RETVAL(data->flash ? mxt_check_bootloader(data) : 0);
}
if (!data->object_table)
return IRQ_HANDLED;
if (data->T44_address) {
return mxt_process_messages_t44(data);
} else {
return mxt_process_messages(data);
}
}
static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
u8 value, bool wait)
{
u16 reg;
u8 command_register;
int timeout_counter = 0;
int ret;
reg = data->T6_address + cmd_offset;
ret = mxt_write_reg(data->client, reg, value);
if (ret)
return ret;
if (!wait)
return 0;
do {
msleep(20);
ret = __mxt_read_reg(data->client, reg, 1, &command_register);
if (ret)
return ret;
} while (command_register != 0 && timeout_counter++ <= 100);
if (timeout_counter > 100) {
dev_err(&data->client->dev, "Command failed!\n");
return -EIO;
}
return 0;
}
static int mxt_soft_reset(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int ret = 0;
dev_info(dev, "Resetting device\n");
disable_irq(data->irq);
reinit_completion(&data->reset_completion);
ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
if (ret)
return ret;
/* Ignore CHG line for 100ms after reset */
msleep(100);
enable_irq(data->irq);
ret = mxt_wait_for_completion(data, &data->reset_completion,
MXT_RESET_TIMEOUT);
if (ret)
return ret;
return 0;
}
static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
{
/*
* On failure, CRC is set to 0 and config will always be
* downloaded.
*/
data->config_crc = 0;
reinit_completion(&data->crc_completion);
mxt_t6_command(data, cmd, value, true);
/*
* Wait for crc message. On failure, CRC is set to 0 and config will
* always be downloaded.
*/
mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
}
static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
{
static const unsigned int crcpoly = 0x80001B;
u32 result;
u32 data_word;
data_word = (secondbyte << 8) | firstbyte;
result = ((*crc << 1) ^ data_word);
if (result & 0x1000000)
result ^= crcpoly;
*crc = result;
}
static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
{
u32 crc = 0;
u8 *ptr = base + start_off;
u8 *last_val = base + end_off - 1;
if (end_off < start_off)
return -EINVAL;
while (ptr < last_val) {
mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
ptr += 2;
}
/* if len is odd, fill the last byte with 0 */
if (ptr == last_val)
mxt_calc_crc24(&crc, *ptr, 0);
/* Mask to 24-bit */
crc &= 0x00FFFFFF;
return crc;
}
static int mxt_check_retrigen(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
int val;
if (irq_get_trigger_type(data->irq) & IRQF_TRIGGER_LOW)
return 0;
if (data->T18_address) {
error = __mxt_read_reg(client,
data->T18_address + MXT_COMMS_CTRL,
1, &val);
if (error)
return error;
if (val & MXT_COMMS_RETRIGEN)
return 0;
}
dev_warn(&client->dev, "Enabling RETRIGEN workaround\n");
data->use_retrigen_workaround = true;
return 0;
}
static int mxt_prepare_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
{
struct device *dev = &data->client->dev;
struct mxt_object *object;
unsigned int type, instance, size, byte_offset;
int offset;
int ret;
int i;
u16 reg;
u8 val;
while (cfg->raw_pos < cfg->raw_size) {
/* Read type, instance, length */
ret = sscanf(cfg->raw + cfg->raw_pos, "%4x %4x %4x%n",
&type, &instance, &size, &offset);
if (ret == 0) {
/* EOF */
break;
} else if (ret != 3) {
dev_err(dev, "Bad format: failed to parse object\n");
return -EINVAL;
}
cfg->raw_pos += offset;
object = mxt_get_object(data, type);
if (!object) {
/* Skip object */
for (i = 0; i < size; i++) {
ret = sscanf(cfg->raw + cfg->raw_pos, "%2hhx%n",
&val, &offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
cfg->raw_pos += offset;
}
continue;
}
if (size > mxt_obj_size(object)) {
/*
* Either we are in fallback mode due to wrong
* config or config from a later fw version,
* or the file is corrupt or hand-edited.
*/
dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
size - mxt_obj_size(object), type);
} else if (mxt_obj_size(object) > size) {
/*
* If firmware is upgraded, new bytes may be added to
* end of objects. It is generally forward compatible
* to zero these bytes - previous behaviour will be
* retained. However this does invalidate the CRC and
* will force fallback mode until the configuration is
* updated. We warn here but do nothing else - the
* malloc has zeroed the entire configuration.
*/
dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
mxt_obj_size(object) - size, type);
}
if (instance >= mxt_obj_instances(object)) {
dev_err(dev, "Object instances exceeded!\n");
return -EINVAL;
}
reg = object->start_address + mxt_obj_size(object) * instance;
for (i = 0; i < size; i++) {
ret = sscanf(cfg->raw + cfg->raw_pos, "%2hhx%n",
&val,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format in T%d at %d\n",
type, i);
return -EINVAL;
}
cfg->raw_pos += offset;
if (i > mxt_obj_size(object))
continue;
byte_offset = reg + i - cfg->start_ofs;
if (byte_offset < cfg->mem_size) {
*(cfg->mem + byte_offset) = val;
} else {
dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
reg, object->type, byte_offset);
return -EINVAL;
}
}
}
return 0;
}
static int mxt_upload_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
{
unsigned int byte_offset = 0;
int error;
/* Write configuration as blocks */
while (byte_offset < cfg->mem_size) {
unsigned int size = cfg->mem_size - byte_offset;
if (size > MXT_MAX_BLOCK_WRITE)
size = MXT_MAX_BLOCK_WRITE;
error = __mxt_write_reg(data->client,
cfg->start_ofs + byte_offset,
size, cfg->mem + byte_offset);
if (error) {
dev_err(&data->client->dev,
"Config write error, ret=%d\n", error);
return error;
}
byte_offset += size;
}
return 0;
}
static int mxt_init_t7_power_cfg(struct mxt_data *data);
/*
* mxt_update_cfg - download configuration to chip
*
* Atmel Raw Config File Format
*
* The first four lines of the raw config file contain:
* 1) Version
* 2) Chip ID Information (first 7 bytes of device memory)
* 3) Chip Information Block 24-bit CRC Checksum
* 4) Chip Configuration 24-bit CRC Checksum
*
* The rest of the file consists of one line per object instance:
* <TYPE> <INSTANCE> <SIZE> <CONTENTS>
*
* <TYPE> - 2-byte object type as hex
* <INSTANCE> - 2-byte object instance number as hex
* <SIZE> - 2-byte object size as hex
* <CONTENTS> - array of <SIZE> 1-byte hex values
*/
static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw)
{
struct device *dev = &data->client->dev;
struct mxt_cfg cfg;
int ret;
int offset;
int i;
u32 info_crc, config_crc, calculated_crc;
u16 crc_start = 0;
/* Make zero terminated copy of the OBP_RAW file */
cfg.raw = kzalloc(fw->size + 1, GFP_KERNEL);
if (!cfg.raw)
return -ENOMEM;
memcpy(cfg.raw, fw->data, fw->size);
cfg.raw[fw->size] = '\0';
cfg.raw_size = fw->size;
mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
if (strncmp(cfg.raw, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
dev_err(dev, "Unrecognised config file\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos = strlen(MXT_CFG_MAGIC);
/* Load information block and check */
for (i = 0; i < sizeof(struct mxt_info); i++) {
ret = sscanf(cfg.raw + cfg.raw_pos, "%2hhx%n",
(unsigned char *)&cfg.info + i,
&offset);
if (ret != 1) {
dev_err(dev, "Bad format\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
}
if (cfg.info.family_id != data->info->family_id) {
dev_err(dev, "Family ID mismatch!\n");
ret = -EINVAL;
goto release_raw;
}
if (cfg.info.variant_id != data->info->variant_id) {
dev_err(dev, "Variant ID mismatch!\n");
ret = -EINVAL;
goto release_raw;
}
/* Read CRCs */
ret = sscanf(cfg.raw + cfg.raw_pos, "%6x%n", &info_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Info CRC\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
ret = sscanf(cfg.raw + cfg.raw_pos, "%6x%n", &config_crc, &offset);
if (ret != 1) {
dev_err(dev, "Bad format: failed to parse Config CRC\n");
ret = -EINVAL;
goto release_raw;
}
cfg.raw_pos += offset;
/*
* The Info Block CRC is calculated over mxt_info and the object
* table. If it does not match then we are trying to load the
* configuration from a different chip or firmware version, so
* the configuration CRC is invalid anyway.
*/
if (info_crc == data->info_crc) {
if (config_crc == 0 || data->config_crc == 0) {
dev_info(dev, "CRC zero, attempting to apply config\n");
} else if (config_crc == data->config_crc) {
dev_dbg(dev, "Config CRC 0x%06X: OK\n",
data->config_crc);
return 0;
} else {
dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
data->config_crc, config_crc);
}
} else {
dev_warn(dev,
"Warning: Info CRC error - device=0x%06X file=0x%06X\n",
data->info_crc, info_crc);
}
/* Malloc memory to store configuration */
cfg.start_ofs = MXT_OBJECT_START +
data->info->object_num * sizeof(struct mxt_object) +
MXT_INFO_CHECKSUM_SIZE;
cfg.mem_size = data->mem_size - cfg.start_ofs;
cfg.mem = kzalloc(cfg.mem_size, GFP_KERNEL);
if (!cfg.mem) {
ret = -ENOMEM;
goto release_raw;
}
ret = mxt_prepare_cfg_mem(data, &cfg);
if (ret)
goto release_mem;
/* Calculate crc of the received configs (not the raw config file) */
if (data->T71_address)
crc_start = data->T71_address;
else if (data->T7_address)
crc_start = data->T7_address;
else
dev_warn(dev, "Could not find CRC start\n");
if (crc_start > cfg.start_ofs) {
calculated_crc = mxt_calculate_crc(cfg.mem,
crc_start - cfg.start_ofs,
cfg.mem_size);
if (config_crc > 0 && config_crc != calculated_crc)
dev_warn(dev, "Config CRC in file inconsistent, calculated=%06X, file=%06X\n",
calculated_crc, config_crc);
}
ret = mxt_upload_cfg_mem(data, &cfg);
if (ret)
goto release_mem;
mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
ret = mxt_check_retrigen(data);
if (ret)
goto release_mem;
ret = mxt_soft_reset(data);
if (ret)
goto release_mem;
dev_info(dev, "Config successfully updated\n");
/* T7 config may have changed */
mxt_init_t7_power_cfg(data);
release_mem:
kfree(cfg.mem);
release_raw:
kfree(cfg.raw);
return ret;
}
static int mxt_acquire_irq(struct mxt_data *data)
{
int error;
if (!data->irq) {
error = request_threaded_irq(data->client->irq, NULL,
mxt_interrupt,
data->pdata->irqflags | IRQF_ONESHOT,
data->client->name, data);
if (error) {
dev_err(&data->client->dev, "Error requesting irq\n");
return error;
}
/* Presence of data->irq means IRQ initialised */
data->irq = data->client->irq;
} else {
enable_irq(data->irq);
}
if (data->object_table && data->use_retrigen_workaround) {
error = mxt_process_messages_until_invalid(data);
if (error)
return error;
}
return 0;
}
static void mxt_free_input_device(struct mxt_data *data)
{
if (data->input_dev) {
input_unregister_device(data->input_dev);
data->input_dev = NULL;
}
}
static void mxt_free_object_table(struct mxt_data *data)
{
data->object_table = NULL;
data->info = NULL;
kfree(data->raw_info_block);
data->raw_info_block = NULL;
kfree(data->msg_buf);
data->msg_buf = NULL;
data->T5_address = 0;
data->T5_msg_size = 0;
data->T6_reportid = 0;
data->T7_address = 0;
data->T71_address = 0;
data->T9_reportid_min = 0;
data->T9_reportid_max = 0;
data->T15_reportid_min = 0;
data->T15_reportid_max = 0;
data->T18_address = 0;
data->T19_reportid = 0;
data->T42_reportid_min = 0;
data->T42_reportid_max = 0;
data->T44_address = 0;
data->T48_reportid = 0;
data->T92_reportid = 0;
data->T92_address = 0;
data->T93_reportid = 0;
data->T93_address = 0;
data->T100_reportid_min = 0;
data->T100_reportid_max = 0;
data->max_reportid = 0;
}
static int mxt_parse_object_table(struct mxt_data *data,
struct mxt_object *object_table)
{
struct i2c_client *client = data->client;
int i;
u8 reportid;
u16 end_address;
/* Valid Report IDs start counting from 1 */
reportid = 1;
data->mem_size = 0;
for (i = 0; i < data->info->object_num; i++) {
struct mxt_object *object = object_table + i;
u8 min_id, max_id;
le16_to_cpus(&object->start_address);
if (object->num_report_ids) {
min_id = reportid;
reportid += object->num_report_ids *
mxt_obj_instances(object);
max_id = reportid - 1;
} else {
min_id = 0;
max_id = 0;
}
dev_dbg(&data->client->dev,
"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
object->type, object->start_address,
mxt_obj_size(object), mxt_obj_instances(object),
min_id, max_id);
switch (object->type) {
case MXT_GEN_MESSAGE_T5:
if (data->info->family_id == 0x80 &&
data->info->version < 0x20) {
/*
* On mXT224 firmware versions prior to V2.0
* read and discard unused CRC byte otherwise
* DMA reads are misaligned.
*/
data->T5_msg_size = mxt_obj_size(object);
} else {
/* CRC not enabled, so skip last byte */
data->T5_msg_size = mxt_obj_size(object) - 1;
}
data->T5_address = object->start_address;
break;
case MXT_GEN_COMMAND_T6:
data->T6_reportid = min_id;
data->T6_address = object->start_address;
break;
case MXT_GEN_POWER_T7:
data->T7_address = object->start_address;
break;
case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
data->T71_address = object->start_address;
break;
case MXT_TOUCH_MULTI_T9:
data->multitouch = MXT_TOUCH_MULTI_T9;
/* Only handle messages from first T9 instance */
data->T9_reportid_min = min_id;
data->T9_reportid_max = min_id +
object->num_report_ids - 1;
data->num_touchids = object->num_report_ids;
break;
case MXT_TOUCH_KEYARRAY_T15:
data->T15_reportid_min = min_id;
data->T15_reportid_max = max_id;
break;
case MXT_SPT_COMMSCONFIG_T18:
data->T18_address = object->start_address;
break;
case MXT_PROCI_TOUCHSUPPRESSION_T42:
data->T42_reportid_min = min_id;
data->T42_reportid_max = max_id;
break;
case MXT_SPT_MESSAGECOUNT_T44:
data->T44_address = object->start_address;
break;
case MXT_SPT_GPIOPWM_T19:
data->T19_reportid = min_id;
break;
case MXT_PROCG_NOISESUPPRESSION_T48:
data->T48_reportid = min_id;
break;
case MXT_PROCI_SYMBOLGESTUREPROCESSOR:
data->T92_reportid = min_id;
data->T92_address = object->start_address;
break;
case MXT_PROCI_TOUCHSEQUENCELOGGER:
data->T93_reportid = min_id;
data->T93_address = object->start_address;
break;
case MXT_TOUCH_MULTITOUCHSCREEN_T100:
data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
data->T100_reportid_min = min_id;
data->T100_reportid_max = max_id;
/* first two report IDs reserved */
data->num_touchids = object->num_report_ids - 2;
break;
case MXT_PROCI_ACTIVESTYLUS_T107:
data->T107_address = object->start_address;
break;
}
end_address = object->start_address
+ mxt_obj_size(object) * mxt_obj_instances(object) - 1;
if (end_address >= data->mem_size)
data->mem_size = end_address + 1;
}
/* Store maximum reportid */
data->max_reportid = reportid;
/* If T44 exists, T5 position has to be directly after */
if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
dev_err(&client->dev, "Invalid T44 position\n");
return -EINVAL;
}
data->msg_buf = kcalloc(data->max_reportid,
data->T5_msg_size, GFP_KERNEL);
if (!data->msg_buf)
return -ENOMEM;
return 0;
}
static int mxt_read_info_block(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
size_t object_size, size;
void *id_buf = NULL, *object_buf = NULL, *buf = NULL;
uint8_t num_objects;
u32 calculated_crc;
u8 *crc_ptr;
/* If info block already allocated, free it */
if (data->raw_info_block != NULL)
mxt_free_object_table(data);
/* Read 7-byte ID information block starting at address 0 */
size = sizeof(struct mxt_info);
id_buf = kzalloc(size, GFP_KERNEL);
if (!id_buf)
return -ENOMEM;
error = __mxt_read_reg(client, 0, size, id_buf);
if (error)
goto err_free_mem;
/* Read rest of info block */
num_objects = ((struct mxt_info *)id_buf)->object_num;
object_size = (num_objects * sizeof(struct mxt_object))
+ MXT_INFO_CHECKSUM_SIZE;
object_buf = kzalloc(object_size, GFP_KERNEL);
if (!object_buf) {
error = -ENOMEM;
goto err_free_mem;
}
error = mxt_read_blks(data, MXT_OBJECT_START, object_size, object_buf);
if (error)
goto err_free_mem;
/* Resize buffer to give space for rest of info block */
size += object_size;
buf = krealloc(id_buf, size, GFP_KERNEL);
if (!buf) {
error = -ENOMEM;
goto err_free_mem;
}
id_buf = NULL;
/* Copy rest of info block into the buffer */
memcpy(buf + MXT_OBJECT_START, object_buf, object_size);
kfree(object_buf);
object_buf = NULL;
/* Extract & calculate checksum */
crc_ptr = buf + size - MXT_INFO_CHECKSUM_SIZE;
data->info_crc = crc_ptr[0] | (crc_ptr[1] << 8) | (crc_ptr[2] << 16);
calculated_crc = mxt_calculate_crc(buf, 0,
size - MXT_INFO_CHECKSUM_SIZE);
/*
* CRC mismatch can be caused by data corruption due to I2C comms
* issue or else device is not using Object Based Protocol (eg i2c-hid)
*/
if ((data->info_crc == 0) || (data->info_crc != calculated_crc)) {
dev_err(&client->dev,
"Info Block CRC error calculated=0x%06X read=0x%06X\n",
calculated_crc, data->info_crc);
error = -EIO;
goto err_free_mem;
}
data->raw_info_block = buf;
data->info = (struct mxt_info *)buf;
dev_info(&client->dev,
"Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
data->info->family_id, data->info->variant_id,
data->info->version >> 4, data->info->version & 0xf,
data->info->build, data->info->object_num);
/* Parse object table information */
error = mxt_parse_object_table(data, buf + MXT_OBJECT_START);
if (error) {
dev_err(&client->dev, "Error %d parsing object table\n", error);
mxt_free_object_table(data);
return error;
}
data->object_table = (struct mxt_object *)(buf + MXT_OBJECT_START);
return 0;
err_free_mem:
kfree(id_buf);
kfree(object_buf);
kfree(buf);
return error;
}
static void mxt_regulator_enable(struct mxt_data *data)
{
int error;
if (!data->reg_vdd || !data->reg_avdd)
return;
gpio_set_value(data->pdata->gpio_reset, 0);
error = regulator_enable(data->reg_vdd);
if (error)
return;
error = regulator_enable(data->reg_avdd);
if (error)
return;
/*
* According to maXTouch power sequencing specification, RESET line
* must be kept low until some time after regulators come up to
* voltage
*/
msleep(MXT_REGULATOR_DELAY);
gpio_set_value(data->pdata->gpio_reset, 1);
msleep(MXT_CHG_DELAY);
retry_wait:
reinit_completion(&data->chg_completion);
data->in_bootloader = true;
error = mxt_wait_for_completion(data, &data->chg_completion,
MXT_POWERON_DELAY);
if (error == -EINTR)
goto retry_wait;
data->in_bootloader = false;
}
static void mxt_regulator_disable(struct mxt_data *data)
{
if (!data->reg_vdd || !data->reg_avdd)
return;
regulator_disable(data->reg_vdd);
regulator_disable(data->reg_avdd);
}
static int mxt_probe_regulators(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int error;
/* Must have reset GPIO to use regulator support */
if (!gpio_is_valid(data->pdata->gpio_reset)) {
error = -EINVAL;
goto fail;
}
data->reg_vdd = regulator_get(dev, "vdd");
if (IS_ERR(data->reg_vdd)) {
error = PTR_ERR(data->reg_vdd);
dev_err(dev, "Error %d getting vdd regulator\n", error);
goto fail;
}
data->reg_avdd = regulator_get(dev, "avdd");
if (IS_ERR(data->reg_avdd)) {
error = PTR_ERR(data->reg_avdd);
dev_err(dev, "Error %d getting avdd regulator\n", error);
goto fail_release;
}
mxt_regulator_enable(data);
dev_dbg(dev, "Initialised regulators\n");
return 0;
fail_release:
regulator_put(data->reg_vdd);
fail:
data->reg_vdd = NULL;
data->reg_avdd = NULL;
return error;
}
static int mxt_read_t9_resolution(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct t9_range range;
unsigned char orient;
struct mxt_object *object;
object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
if (!object)
return -EINVAL;
error = __mxt_read_reg(client,
object->start_address + MXT_T9_RANGE,
sizeof(range), &range);
if (error)
return error;
data->max_x = get_unaligned_le16(&range.x);
data->max_y = get_unaligned_le16(&range.y);
error = __mxt_read_reg(client,
object->start_address + MXT_T9_ORIENT,
1, &orient);
if (error)
return error;
data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
return 0;
}
static int mxt_set_up_active_stylus(struct input_dev *input_dev,
struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct mxt_object *object;
u8 styaux;
int aux;
u8 ctrl;
object = mxt_get_object(data, MXT_PROCI_ACTIVESTYLUS_T107);
if (!object)
return 0;
error = __mxt_read_reg(client, object->start_address, 1, &ctrl);
if (error)
return error;
/* Check enable bit */
if (!(ctrl & 0x01))
return 0;
error = __mxt_read_reg(client,
object->start_address + MXT_T107_STYLUS_STYAUX,
1, &styaux);
if (error)
return error;
/* map aux bits */
aux = 7;
if (styaux & MXT_T107_STYLUS_STYAUX_PRESSURE)
data->stylus_aux_pressure = aux++;
if (styaux & MXT_T107_STYLUS_STYAUX_PEAK)
data->stylus_aux_peak = aux++;
input_set_capability(input_dev, EV_KEY, BTN_STYLUS);
input_set_capability(input_dev, EV_KEY, BTN_STYLUS2);
input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE, 0, MT_TOOL_MAX, 0, 0);
dev_dbg(&client->dev,
"T107 active stylus, aux map pressure:%u peak:%u\n",
data->stylus_aux_pressure, data->stylus_aux_peak);
return 0;
}
static int mxt_read_t100_config(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
struct mxt_object *object;
u16 range_x, range_y;
u8 cfg, tchaux;
u8 aux;
object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
if (!object)
return -EINVAL;
/* read touchscreen dimensions */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_XRANGE,
sizeof(range_x), &range_x);
if (error)
return error;
data->max_x = get_unaligned_le16(&range_x);
error = __mxt_read_reg(client,
object->start_address + MXT_T100_YRANGE,
sizeof(range_y), &range_y);
if (error)
return error;
data->max_y = get_unaligned_le16(&range_y);
/* read orientation config */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_CFG1,
1, &cfg);
if (error)
return error;
data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
/* allocate aux bytes */
error = __mxt_read_reg(client,
object->start_address + MXT_T100_TCHAUX,
1, &tchaux);
if (error)
return error;
aux = 6;
if (tchaux & MXT_T100_TCHAUX_VECT)
data->t100_aux_vect = aux++;
if (tchaux & MXT_T100_TCHAUX_AMPL)
data->t100_aux_ampl = aux++;
if (tchaux & MXT_T100_TCHAUX_AREA)
data->t100_aux_area = aux++;
dev_dbg(&client->dev,
"T100 aux mappings vect:%u ampl:%u area:%u\n",
data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
return 0;
}
static int mxt_input_open(struct input_dev *dev);
static void mxt_input_close(struct input_dev *dev);
static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
struct mxt_data *data)
{
const struct mxt_platform_data *pdata = data->pdata;
int i;
input_dev->name = "Atmel maXTouch Touchpad";
__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_X,
MXT_PIXELS_PER_MM);
input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
MXT_PIXELS_PER_MM);
for (i = 0; i < pdata->t19_num_keys; i++)
if (pdata->t19_keymap[i] != KEY_RESERVED)
input_set_capability(input_dev, EV_KEY,
pdata->t19_keymap[i]);
}
static int mxt_initialize_input_device(struct mxt_data *data)
{
const struct mxt_platform_data *pdata = data->pdata;
struct device *dev = &data->client->dev;
struct input_dev *input_dev;
int error;
unsigned int num_mt_slots;
unsigned int mt_flags = 0;
int i;
switch (data->multitouch) {
case MXT_TOUCH_MULTI_T9:
num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
error = mxt_read_t9_resolution(data);
if (error)
dev_warn(dev, "Failed to initialize T9 resolution\n");
break;
case MXT_TOUCH_MULTITOUCHSCREEN_T100:
num_mt_slots = data->num_touchids;
error = mxt_read_t100_config(data);
if (error)
dev_warn(dev, "Failed to read T100 config\n");
break;
default:
dev_err(dev, "Invalid multitouch object\n");
return -EINVAL;
}
/* Handle default values and orientation switch */
if (data->max_x == 0)
data->max_x = 1023;
if (data->max_y == 0)
data->max_y = 1023;
if (data->xy_switch)
swap(data->max_x, data->max_y);
dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
/* Register input device */
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
if (data->pdata->input_name)
input_dev->name = data->pdata->input_name;
else
input_dev->name = "Atmel maXTouch Touchscreen";
input_dev->phys = data->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = dev;
input_dev->open = mxt_input_open;
input_dev->close = mxt_input_close;
set_bit(EV_ABS, input_dev->evbit);
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
/* For single touch */
input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0);
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_ampl)) {
input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
}
/* If device has buttons we assume it is a touchpad */
if (pdata->t19_num_keys) {
mxt_set_up_as_touchpad(input_dev, data);
mt_flags |= INPUT_MT_POINTER;
} else {
mt_flags |= INPUT_MT_DIRECT;
}
/* For multi touch */
error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
if (error) {
dev_err(dev, "Error %d initialising slots\n", error);
goto err_free_mem;
}
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
0, MT_TOOL_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_MT_DISTANCE,
MXT_DISTANCE_ACTIVE_TOUCH,
MXT_DISTANCE_HOVERING,
0, 0);
}
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, data->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, data->max_y, 0, 0);
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_area)) {
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, MXT_MAX_AREA, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
(data->t100_aux_ampl || data->stylus_aux_pressure))) {
input_set_abs_params(input_dev, ABS_MT_PRESSURE,
0, 255, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_vect) {
input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
0, 255, 0, 0);
}
if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
(data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->t100_aux_vect)) {
input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
0, 255, 0, 0);
}
/* For T107 Active Stylus */
if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
data->T107_address) {
error = mxt_set_up_active_stylus(input_dev, data);
if (error)
dev_warn(dev, "Failed to read T107 config\n");
}
/* For T15 Key Array */
if (data->T15_reportid_min) {
data->t15_keystatus = 0;
for (i = 0; i < data->pdata->t15_num_keys; i++)
input_set_capability(input_dev, EV_KEY,
data->pdata->t15_keymap[i]);
}
input_set_drvdata(input_dev, data);
error = input_register_device(input_dev);
if (error) {
dev_err(dev, "Error %d registering input device\n", error);
goto err_free_mem;
}
data->input_dev = input_dev;
return 0;
err_free_mem:
input_free_device(input_dev);
return error;
}
static int mxt_sysfs_init(struct mxt_data *data);
static void mxt_sysfs_remove(struct mxt_data *data);
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg);
static void mxt_config_cb(const struct firmware *cfg, void *ctx)
{
mxt_configure_objects(ctx, cfg);
release_firmware(cfg);
}
static int mxt_initialize(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int recovery_attempts = 0;
int error;
while (1) {
error = mxt_read_info_block(data);
if (!error)
break;
/* Check bootloader state */
error = mxt_probe_bootloader(data, false);
if (error) {
dev_info(&client->dev, "Trying alternate bootloader address\n");
error = mxt_probe_bootloader(data, true);
if (error) {
/* Chip is not in appmode or bootloader mode */
return error;
}
}
/* OK, we are in bootloader, see if we can recover */
if (++recovery_attempts > 1) {
dev_err(&client->dev, "Could not recover from bootloader mode\n");
/*
* We can reflash from this state, so do not
* abort initialization.
*/
data->in_bootloader = true;
return 0;
}
/* Attempt to exit bootloader into app mode */
mxt_send_bootloader_cmd(data, false);
msleep(MXT_FW_RESET_TIME);
}
error = mxt_check_retrigen(data);
if (error)
goto err_free_object_table;
error = mxt_acquire_irq(data);
if (error)
goto err_free_object_table;
error = mxt_sysfs_init(data);
if (error)
goto err_free_object_table;
error = mxt_debug_msg_init(data);
if (error)
goto err_free_object_table;
if (data->cfg_name) {
error = request_firmware_nowait(THIS_MODULE, true,
data->cfg_name, &data->client->dev,
GFP_KERNEL, data, mxt_config_cb);
if (error) {
dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
error);
goto err_free_object_table;
}
} else {
error = mxt_configure_objects(data, NULL);
if (error)
goto err_free_object_table;
}
return 0;
err_free_object_table:
mxt_free_object_table(data);
return error;
}
static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
{
struct device *dev = &data->client->dev;
int error;
struct t7_config *new_config;
struct t7_config deepsleep = { .active = 0, .idle = 0 };
if (sleep == MXT_POWER_CFG_DEEPSLEEP)
new_config = &deepsleep;
else
new_config = &data->t7_cfg;
error = __mxt_write_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), new_config);
if (error)
return error;
dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
new_config->active, new_config->idle);
return 0;
}
static int mxt_init_t7_power_cfg(struct mxt_data *data)
{
struct device *dev = &data->client->dev;
int error;
bool retry = false;
recheck:
error = __mxt_read_reg(data->client, data->T7_address,
sizeof(data->t7_cfg), &data->t7_cfg);
if (error)
return error;
if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
if (!retry) {
dev_dbg(dev, "T7 cfg zero, resetting\n");
mxt_soft_reset(data);
retry = true;
goto recheck;
} else {
dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
data->t7_cfg.active = 20;
data->t7_cfg.idle = 100;
return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
}
}
dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
data->t7_cfg.active, data->t7_cfg.idle);
return 0;
}
static int mxt_configure_objects(struct mxt_data *data,
const struct firmware *cfg)
{
struct device *dev = &data->client->dev;
int error;
error = mxt_init_t7_power_cfg(data);
if (error) {
dev_err(dev, "Failed to initialize power cfg\n");
goto err_free_object_table;
}
if (cfg) {
error = mxt_update_cfg(data, cfg);
if (error)
dev_warn(dev, "Error %d updating config\n", error);
}
if (data->multitouch) {
error = mxt_initialize_input_device(data);
if (error)
goto err_free_object_table;
} else {
dev_warn(dev, "No touch object detected\n");
}
return 0;
err_free_object_table:
mxt_free_object_table(data);
return error;
}
/* Configuration crc check sum is returned as hex xxxxxx */
static ssize_t mxt_config_crc_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
if (!data->initialized)
return -EBUSY;
return scnprintf(buf, PAGE_SIZE, "%06x\n", data->config_crc);
}
/* Firmware Version is returned as Major.Minor.Build */
static ssize_t mxt_fw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
if (!data->initialized)
return -EBUSY;
return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
data->info->version >> 4, data->info->version & 0xf,
data->info->build);
}
/* Hardware Version is returned as FamilyID.VariantID */
static ssize_t mxt_hw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
if (!data->initialized)
return -EBUSY;
return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
data->info->family_id, data->info->variant_id);
}
static ssize_t mxt_show_instance(char *buf, int count,
struct mxt_object *object, int instance,
const u8 *val)
{
int i;
if (mxt_obj_instances(object) > 1)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Instance %u\n", instance);
for (i = 0; i < mxt_obj_size(object); i++)
count += scnprintf(buf + count, PAGE_SIZE - count,
"\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
return count;
}
static ssize_t mxt_object_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
struct mxt_object *object;
int count = 0;
int i, j;
int error;
u8 *obuf;
if (!data->initialized)
return -EBUSY;
/* Pre-allocate buffer large enough to hold max sized object. */
obuf = kmalloc(256, GFP_KERNEL);
if (!obuf)
return -ENOMEM;
error = 0;
for (i = 0; i < data->info->object_num; i++) {
object = data->object_table + i;
if (!mxt_object_readable(object->type))
continue;
count += scnprintf(buf + count, PAGE_SIZE - count,
"T%u:\n", object->type);
for (j = 0; j < mxt_obj_instances(object); j++) {
u16 size = mxt_obj_size(object);
u16 addr = object->start_address + j * size;
error = mxt_read_blks(data, addr, size, obuf);
if (error)
goto done;
count = mxt_show_instance(buf, count, object, j, obuf);
}
}
done:
kfree(obuf);
return error ?: count;
}
static int mxt_check_firmware_format(struct device *dev,
const struct firmware *fw)
{
unsigned int pos = 0;
char c;
while (pos < fw->size) {
c = *(fw->data + pos);
if (c < '0' || (c > '9' && c < 'A') || c > 'F')
return 0;
pos++;
}
/*
* To convert file try:
* xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
*/
dev_err(dev, "Aborting: firmware file must be in binary format\n");
return -EINVAL;
}
static int mxt_enter_bootloader(struct mxt_data *data)
{
int ret;
if (data->suspended) {
if (data->pdata->suspend_mode == MXT_SUSPEND_REGULATOR)
mxt_regulator_enable(data);
data->suspended = false;
}
if (!data->in_bootloader) {
disable_irq(data->irq);
/* Change to the bootloader mode */
ret = mxt_t6_command(data, MXT_COMMAND_RESET,
MXT_BOOT_VALUE, false);
if (ret)
return ret;
msleep(MXT_RESET_TIME);
/* Do not need to scan since we know family ID */
ret = mxt_probe_bootloader(data, 0);
if (ret)
return ret;
data->in_bootloader = true;
mxt_debug_msg_remove(data);
mxt_sysfs_remove(data);
mxt_free_input_device(data);
mxt_free_object_table(data);
}
dev_dbg(&data->client->dev, "Entered bootloader\n");
return 0;
}
static void mxt_fw_work(struct work_struct *work)
{
struct mxt_flash *f =
container_of(work, struct mxt_flash, work.work);
mxt_check_bootloader(f->data);
}
static int mxt_load_fw(struct device *dev)
{
struct mxt_data *data = dev_get_drvdata(dev);
int ret;
data->flash = devm_kzalloc(dev, sizeof(struct mxt_flash), GFP_KERNEL);
if (!data->flash)
return -ENOMEM;
data->flash->data = data;
ret = request_firmware(&data->flash->fw, data->fw_name, dev);
if (ret) {
dev_err(dev, "Unable to open firmware %s\n", data->fw_name);
goto free;
}
/* Check for incorrect enc file */
ret = mxt_check_firmware_format(dev, data->flash->fw);
if (ret)
goto release_firmware;
init_completion(&data->flash->flash_completion);
INIT_DELAYED_WORK(&data->flash->work, mxt_fw_work);
reinit_completion(&data->flash->flash_completion);
if (!data->in_bootloader) {
ret = mxt_enter_bootloader(data);
if (ret)
goto release_firmware;
}
ret = mxt_acquire_irq(data);
if (ret)
goto release_firmware;
/* Poll after 0.1s if no interrupt received */
schedule_delayed_work(&data->flash->work, HZ / 10);
/* Wait for flash. */
ret = mxt_wait_for_completion(data, &data->flash->flash_completion,
MXT_BOOTLOADER_WAIT);
disable_irq(data->irq);
cancel_delayed_work_sync(&data->flash->work);
data->in_bootloader = false;
release_firmware:
release_firmware(data->flash->fw);
free:
devm_kfree(dev, data->flash);
data->flash = NULL;
return ret;
}
static int mxt_update_file_name(struct device *dev, char **file_name,
const char *buf, size_t count)
{
char *file_name_tmp;
/* Simple sanity check */
if (count > 64) {
dev_warn(dev, "File name too long\n");
return -EINVAL;
}
file_name_tmp = krealloc(*file_name, count + 1, GFP_KERNEL);
if (!file_name_tmp)
return -ENOMEM;
*file_name = file_name_tmp;
memcpy(*file_name, buf, count);
/* Echo into the sysfs entry may append newline at the end of buf */
if (buf[count - 1] == '\n')
(*file_name)[count - 1] = '\0';
else
(*file_name)[count] = '\0';
return 0;
}
static ssize_t mxt_update_fw_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
int error;
if (!data->initialized)
return -EBUSY;
error = mxt_update_file_name(dev, &data->fw_name, buf, count);
if (error)
return error;
if (data->irq)
disable_irq(data->irq);
error = mxt_load_fw(dev);
if (error) {
dev_err(dev, "The firmware update failed(%d)\n", error);
count = error;
if (data->irq)
enable_irq(data->irq);
} else {
dev_info(dev, "The firmware update succeeded\n");
data->suspended = false;
error = mxt_initialize(data);
if (error)
return error;
}
return count;
}
static ssize_t mxt_update_cfg_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
const struct mxt_platform_data *pdata = data->pdata;
const struct firmware *cfg;
int ret;
if (!data->initialized)
return -EBUSY;
ret = mxt_update_file_name(dev, &data->cfg_name, buf, count);
if (ret)
return ret;
ret = request_firmware(&cfg, data->cfg_name, dev);
if (ret < 0) {
dev_err(dev, "Failure to request config file %s\n",
data->cfg_name);
ret = -ENOENT;
goto out;
}
data->updating_config = true;
mxt_free_input_device(data);
if (data->suspended) {
if (pdata->suspend_mode == MXT_SUSPEND_REGULATOR) {
enable_irq(data->irq);
mxt_regulator_enable(data);
} else if (pdata->suspend_mode == MXT_SUSPEND_DEEP_SLEEP) {
mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
ret = mxt_acquire_irq(data);
if (ret)
goto release;
}
data->suspended = false;
}
ret = mxt_configure_objects(data, cfg);
if (ret)
goto release;
ret = count;
release:
release_firmware(cfg);
out:
data->updating_config = false;
return ret;
}
static ssize_t mxt_debug_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
char c;
if (!data->initialized)
return -EBUSY;
c = data->debug_enabled ? '1' : '0';
return scnprintf(buf, PAGE_SIZE, "%c\n", c);
}
static ssize_t mxt_debug_notify_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mxt_data *data = dev_get_drvdata(dev);
if (!data->initialized)
return -EBUSY;
return snprintf(buf, 3, "0\n");
}
static ssize_t mxt_debug_v2_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
u8 i;
ssize_t ret;
if (!data->initialized)
return -EBUSY;
if (kstrtou8(buf, 0, &i) == 0 && i < 2) {
if (i == 1)
mxt_debug_msg_enable(data);
else
mxt_debug_msg_disable(data);
ret = count;
} else {
dev_dbg(dev, "debug_enabled write error\n");
ret = -EINVAL;
}
return ret;
}
static ssize_t mxt_debug_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct mxt_data *data = dev_get_drvdata(dev);
u8 i;
ssize_t ret;
if (!data->initialized)
return -EBUSY;
if (kstrtou8(buf, 0, &i) == 0 && i < 2) {
data->debug_enabled = (i == 1);
dev_dbg(dev, "%s\n", i ? "debug enabled" : "debug disabled");
ret = count;
} else {
dev_dbg(dev, "debug_enabled write error\n");
ret = -EINVAL;
}
return ret;
}
static int mxt_check_mem_access_params(struct mxt_data *data, loff_t off,
size_t *count)
{
if (off >= data->mem_size)
return -EIO;
if (off + *count > data->mem_size)
*count = data->mem_size - off;
if (*count > MXT_MAX_BLOCK_WRITE)
*count = MXT_MAX_BLOCK_WRITE;
return 0;
}
static ssize_t mxt_mem_access_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct mxt_data *data = dev_get_drvdata(dev);
int ret = 0;
ret = mxt_check_mem_access_params(data, off, &count);
if (ret < 0)
return ret;
if (count > 0)
ret = __mxt_read_reg(data->client, off, count, buf);
return ret == 0 ? count : ret;
}
static ssize_t mxt_mem_access_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf, loff_t off,
size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct mxt_data *data = dev_get_drvdata(dev);
int ret = 0;
ret = mxt_check_mem_access_params(data, off, &count);
if (ret < 0)
return ret;
if (count > 0)
ret = __mxt_write_reg(data->client, off, count, buf);
return ret == 0 ? count : ret;
}
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
static struct attribute *mxt_fw_attrs[] = {
&dev_attr_update_fw.attr,
NULL
};
static const struct attribute_group mxt_fw_attr_group = {
.attrs = mxt_fw_attrs,
};
static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_cfg, S_IWUSR, NULL, mxt_update_cfg_store);
static DEVICE_ATTR(config_crc, S_IRUGO, mxt_config_crc_show, NULL);
static DEVICE_ATTR(debug_enable, S_IWUSR | S_IRUSR, mxt_debug_enable_show,
mxt_debug_enable_store);
static DEVICE_ATTR(debug_v2_enable, S_IWUSR | S_IRUSR, NULL,
mxt_debug_v2_enable_store);
static DEVICE_ATTR(debug_notify, S_IRUGO, mxt_debug_notify_show, NULL);
static struct attribute *mxt_attrs[] = {
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_object.attr,
&dev_attr_update_cfg.attr,
&dev_attr_config_crc.attr,
&dev_attr_debug_enable.attr,
&dev_attr_debug_v2_enable.attr,
&dev_attr_debug_notify.attr,
NULL
};
static const struct attribute_group mxt_attr_group = {
.attrs = mxt_attrs,
};
static int mxt_sysfs_init(struct mxt_data *data)
{
struct i2c_client *client = data->client;
int error;
error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
if (error) {
dev_err(&client->dev, "Failure %d creating sysfs group\n",
error);
return error;
}
sysfs_bin_attr_init(&data->mem_access_attr);
data->mem_access_attr.attr.name = "mem_access";
data->mem_access_attr.attr.mode = S_IRUGO | S_IWUSR;
data->mem_access_attr.read = mxt_mem_access_read;
data->mem_access_attr.write = mxt_mem_access_write;
data->mem_access_attr.size = data->mem_size;
error = sysfs_create_bin_file(&client->dev.kobj,
&data->mem_access_attr);
if (error) {
dev_err(&client->dev, "Failed to create %s\n",
data->mem_access_attr.attr.name);
goto err_remove_sysfs_group;
}
return 0;
err_remove_sysfs_group:
sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
return error;
}
static void mxt_sysfs_remove(struct mxt_data *data)
{
struct i2c_client *client = data->client;
if (data->mem_access_attr.attr.name)
sysfs_remove_bin_file(&client->dev.kobj,
&data->mem_access_attr);
sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
}
static void mxt_reset_slots(struct mxt_data *data)
{
struct input_dev *input_dev = data->input_dev;
int id;
if (!input_dev)
return;
for (id = 0; id < data->num_touchids; id++) {
input_mt_slot(input_dev, id);
input_mt_report_slot_state(input_dev, 0, 0);
}
mxt_input_sync(data);
}
static int mxt_start(struct mxt_data *data)
{
int ret;
if (!data->suspended || data->in_bootloader)
return 0;
switch (data->pdata->suspend_mode) {
case MXT_SUSPEND_T9_CTRL:
mxt_soft_reset(data);
/* Touch enable */
/* 0x83 = SCANEN | RPTEN | ENABLE */
mxt_write_object(data,
MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
break;
case MXT_SUSPEND_REGULATOR:
enable_irq(data->irq);
mxt_regulator_enable(data);
break;
case MXT_SUSPEND_DEEP_SLEEP:
default:
/*
* Discard any touch messages still in message buffer
* from before chip went to sleep
*/
mxt_process_messages_until_invalid(data);
ret = mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
if (ret)
return ret;
/* Recalibrate since chip has been in deep sleep */
ret = mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
if (ret)
return ret;
ret = mxt_acquire_irq(data);
if (ret)
return ret;
break;
}
data->suspended = false;
return 0;
}
static int mxt_stop(struct mxt_data *data)
{
int ret;
if (data->suspended || data->in_bootloader || data->updating_config)
return 0;
switch (data->pdata->suspend_mode) {
case MXT_SUSPEND_T9_CTRL:
/* Touch disable */
ret = mxt_write_object(data,
MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
if (ret)
return ret;
break;
case MXT_SUSPEND_REGULATOR:
disable_irq(data->irq);
mxt_regulator_disable(data);
mxt_reset_slots(data);
break;
case MXT_SUSPEND_DEEP_SLEEP:
default:
disable_irq(data->irq);
ret = mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
if (ret)
return ret;
mxt_reset_slots(data);
break;
}
data->suspended = true;
return 0;
}
static int mxt_input_open(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
int ret;
ret = mxt_start(data);
if (ret)
dev_err(&data->client->dev, "%s failed rc=%d\n", __func__, ret);
return ret;
}
static void mxt_input_close(struct input_dev *dev)
{
struct mxt_data *data = input_get_drvdata(dev);
int ret;
ret = mxt_stop(data);
if (ret)
dev_err(&data->client->dev, "%s failed rc=%d\n", __func__, ret);
}
#ifdef CONFIG_OF
static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
struct mxt_platform_data *pdata;
struct device_node *np = client->dev.of_node;
u32 *keymap;
u32 irqflags;
int proplen, ret;
if (!np)
return ERR_PTR(-ENOENT);
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->gpio_reset = of_get_named_gpio_flags(np, "atmel,reset-gpio",
0, NULL);
ret = of_property_read_u32(client->dev.of_node, "atmel,irq_flags",
&irqflags);
if (ret) {
dev_warn(&client->dev, "Using default irq_flags");
pdata->irqflags = IRQF_TRIGGER_FALLING;
} else
pdata->irqflags = irqflags;
of_property_read_string(np, "atmel,cfg_name", &pdata->cfg_name);
of_property_read_string(np, "atmel,input_name", &pdata->input_name);
if (of_find_property(np, "linux,gpio-keymap", &proplen)) {
pdata->t19_num_keys = proplen / sizeof(u32);
keymap = devm_kzalloc(&client->dev,
pdata->t19_num_keys * sizeof(keymap[0]),
GFP_KERNEL);
if (!keymap)
return ERR_PTR(-ENOMEM);
ret = of_property_read_u32_array(np, "linux,gpio-keymap",
keymap, pdata->t19_num_keys);
if (ret)
dev_warn(&client->dev,
"Couldn't read linux,gpio-keymap: %d\n", ret);
pdata->t19_keymap = keymap;
}
of_property_read_u32(np, "atmel,suspend-mode", &pdata->suspend_mode);
return pdata;
}
#else
static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
{
return ERR_PTR(-ENOENT);
}
#endif
#ifdef CONFIG_ACPI
struct mxt_acpi_platform_data {
const char *hid;
struct mxt_platform_data pdata;
};
static unsigned int samus_touchpad_buttons[] = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
BTN_LEFT
};
static struct mxt_acpi_platform_data samus_platform_data[] = {
{
/* Touchpad */
.hid = "ATML0000",
.pdata = {
.t19_num_keys = ARRAY_SIZE(samus_touchpad_buttons),
.t19_keymap = samus_touchpad_buttons,
},
},
{
/* Touchscreen */
.hid = "ATML0001",
},
{ }
};
static unsigned int chromebook_tp_buttons[] = {
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
KEY_RESERVED,
BTN_LEFT
};
static struct mxt_acpi_platform_data chromebook_platform_data[] = {
{
/* Touchpad */
.hid = "ATML0000",
.pdata = {
.t19_num_keys = ARRAY_SIZE(chromebook_tp_buttons),
.t19_keymap = chromebook_tp_buttons,
},
},
{
/* Touchscreen */
.hid = "ATML0001",
},
{ }
};
static const struct dmi_system_id mxt_dmi_table[] = {
{
/* 2015 Google Pixel */
.ident = "Chromebook Pixel 2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
},
.driver_data = samus_platform_data,
},
{
/* Other Google Chromebooks */
.ident = "Chromebook",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
},
.driver_data = chromebook_platform_data,
},
{ }
};
static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
{
struct acpi_device *adev;
const struct dmi_system_id *system_id;
const struct mxt_acpi_platform_data *acpi_pdata;
/*
* Ignore ACPI devices representing bootloader mode.
*
* This is a bit of a hack: Google Chromebook BIOS creates ACPI
* devices for both application and bootloader modes, but we are
* interested in application mode only (if device is in bootloader
* mode we'll end up switching into application anyway). So far
* application mode addresses were all above 0x40, so we'll use it
* as a threshold.
*/
if (client->addr < 0x40)
return ERR_PTR(-ENXIO);
adev = ACPI_COMPANION(&client->dev);
if (!adev)
return ERR_PTR(-ENOENT);
system_id = dmi_first_match(mxt_dmi_table);
if (!system_id)
return ERR_PTR(-ENOENT);
acpi_pdata = system_id->driver_data;
if (!acpi_pdata)
return ERR_PTR(-ENOENT);
while (acpi_pdata->hid) {
if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid))
return &acpi_pdata->pdata;
acpi_pdata++;
}
return ERR_PTR(-ENOENT);
}
#else
static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
{
return ERR_PTR(-ENOENT);
}
#endif
static struct mxt_platform_data *mxt_default_pdata(struct i2c_client *client)
{
struct mxt_platform_data *pdata;
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
/* Set default parameters */
pdata->irqflags = IRQF_TRIGGER_FALLING;
return pdata;
}
static const struct mxt_platform_data *
mxt_get_platform_data(struct i2c_client *client)
{
const struct mxt_platform_data *pdata;
pdata = dev_get_platdata(&client->dev);
if (pdata)
return pdata;
pdata = mxt_parse_dt(client);
if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
return pdata;
pdata = mxt_parse_acpi(client);
if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
return pdata;
pdata = mxt_default_pdata(client);
if (!IS_ERR(pdata))
return pdata;
dev_err(&client->dev, "No platform data specified\n");
return ERR_PTR(-EINVAL);
}
static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct mxt_data *data;
const struct mxt_platform_data *pdata;
int error;
pdata = mxt_get_platform_data(client);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
client->adapter->nr, client->addr);
data->client = client;
data->pdata = pdata;
i2c_set_clientdata(client, data);
if (data->pdata->cfg_name)
mxt_update_file_name(&data->client->dev,
&data->cfg_name,
data->pdata->cfg_name,
strlen(data->pdata->cfg_name));
init_completion(&data->chg_completion);
init_completion(&data->reset_completion);
init_completion(&data->crc_completion);
mutex_init(&data->debug_msg_lock);
if (pdata->suspend_mode == MXT_SUSPEND_REGULATOR) {
error = mxt_acquire_irq(data);
if (error)
goto err_free_mem;
error = mxt_probe_regulators(data);
if (error)
goto err_free_irq;
disable_irq(data->irq);
}
error = sysfs_create_group(&client->dev.kobj, &mxt_fw_attr_group);
if (error) {
dev_err(&client->dev, "Failure %d creating fw sysfs group\n",
error);
return error;
}
error = mxt_initialize(data);
if (error) {
mxt_regulator_disable(data);
regulator_put(data->reg_avdd);
regulator_put(data->reg_vdd);
goto err_free_irq;
}
data->initialized = true;
return 0;
err_free_irq:
if (data->irq)
free_irq(data->irq, data);
err_free_mem:
kfree(data);
return error;
}
static int mxt_remove(struct i2c_client *client)
{
struct mxt_data *data = i2c_get_clientdata(client);
data->initialized = false;
sysfs_remove_group(&client->dev.kobj, &mxt_fw_attr_group);
mxt_debug_msg_remove(data);
mxt_sysfs_remove(data);
if (data->irq)
free_irq(data->irq, data);
regulator_put(data->reg_avdd);
regulator_put(data->reg_vdd);
mxt_free_input_device(data);
mxt_free_object_table(data);
kfree(data);
return 0;
}
static int __maybe_unused mxt_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
if (!input_dev)
return 0;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_stop(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static int __maybe_unused mxt_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mxt_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
if (!input_dev)
return 0;
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mxt_start(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
static const struct of_device_id mxt_of_match[] = {
{ .compatible = "atmel,maxtouch", },
{},
};
MODULE_DEVICE_TABLE(of, mxt_of_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id mxt_acpi_id[] = {
{ "ATML0000", 0 }, /* Touchpad */
{ "ATML0001", 0 }, /* Touchscreen */
{ }
};
MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
#endif
static const struct i2c_device_id mxt_id[] = {
{ "qt602240_ts", 0 },
{ "atmel_mxt_ts", 0 },
{ "atmel_mxt_tp", 0 },
{ "maxtouch", 0 },
{ "mXT224", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mxt_id);
static struct i2c_driver mxt_driver = {
.driver = {
.name = "atmel_mxt_ts",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(mxt_of_match),
.acpi_match_table = ACPI_PTR(mxt_acpi_id),
.pm = &mxt_pm_ops,
},
.probe = mxt_probe,
.remove = mxt_remove,
.id_table = mxt_id,
};
module_i2c_driver(mxt_driver);
/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
MODULE_LICENSE("GPL");
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