forked from rrcarlosr/Jetpack
268 lines
6.4 KiB
C
268 lines
6.4 KiB
C
/*
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* extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
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*
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* Copyright (C) 2008 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.com>
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*
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* Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon
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* (originally switch class is supported)
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/extcon.h>
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#include <linux/extcon/extcon-gpio.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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struct gpio_extcon_data {
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struct device *dev;
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struct extcon_dev *edev;
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int irq;
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struct delayed_work work;
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unsigned long debounce_jiffies;
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struct gpio_desc *id_gpiod;
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struct gpio_extcon_pdata *pdata;
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};
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static void gpio_extcon_work(struct work_struct *work)
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{
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int state;
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int ret;
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struct gpio_extcon_data *data =
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container_of(to_delayed_work(work), struct gpio_extcon_data,
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work);
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if (gpio_is_valid(data->pdata->gpio)) {
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state = gpiod_get_value_cansleep(data->id_gpiod);
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if (data->pdata->gpio_active_low)
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state = !state;
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} else {
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state = data->pdata->default_state;
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}
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ret = extcon_set_state(data->edev,
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data->pdata->supported_cable[0], state);
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if (ret < 0)
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dev_err(data->dev, "cable state update failed\n");
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}
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static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
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{
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struct gpio_extcon_data *data = dev_id;
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queue_delayed_work(system_power_efficient_wq, &data->work,
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data->debounce_jiffies);
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return IRQ_HANDLED;
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}
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static int gpio_extcon_init(struct device *dev, struct gpio_extcon_data *data)
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{
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struct gpio_extcon_pdata *pdata = data->pdata;
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int ret;
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ret = devm_gpio_request_one(dev, pdata->gpio, GPIOF_DIR_IN,
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dev_name(dev));
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if (ret < 0)
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return ret;
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data->id_gpiod = gpio_to_desc(pdata->gpio);
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if (!data->id_gpiod)
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return -EINVAL;
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if (pdata->debounce) {
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ret = gpiod_set_debounce(data->id_gpiod,
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pdata->debounce * 1000);
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if (ret < 0)
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data->debounce_jiffies =
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msecs_to_jiffies(pdata->debounce);
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}
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data->irq = gpiod_to_irq(data->id_gpiod);
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if (data->irq < 0)
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return data->irq;
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return 0;
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}
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static struct gpio_extcon_pdata *of_get_platform_data(
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struct platform_device *pdev)
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{
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struct gpio_extcon_pdata *pdata;
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struct device_node *np = pdev->dev.of_node;
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int gpio;
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u32 pval;
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int ret;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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ret = of_property_read_string(np, "extcon-gpio,name", &pdata->name);
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if (ret < 0)
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pdata->name = np->name;
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ret = of_property_read_u32_array(np, "extcon-gpio,supported-cable",
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pdata->supported_cable, 2);
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if (ret)
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return ERR_PTR(-EINVAL);
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gpio = of_get_named_gpio(np, "gpio", 0);
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if ((gpio < 0) && (gpio != -ENOENT))
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return ERR_PTR(gpio);
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if (gpio == -ENOENT)
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pdata->gpio = -1;
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else
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pdata->gpio = gpio;
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if (pdata->gpio < 0)
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pdata->default_state = of_property_read_bool(np,
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"extcon-gpio,default-connected");
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ret = of_property_read_u32(np, "extcon-gpio,irq-flags", &pval);
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if (!ret)
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pdata->irq_flags = pval;
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else
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pdata->irq_flags = IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING;
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ret = of_property_read_u32(np, "extcon-gpio,debounce", &pval);
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if (!ret)
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pdata->debounce = pval;
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pdata->gpio_active_low = of_property_read_bool(np,
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"extcon-gpio,connection-state-low");
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return pdata;
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}
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static int gpio_extcon_probe(struct platform_device *pdev)
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{
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struct gpio_extcon_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct gpio_extcon_data *data;
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int ret;
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if (!pdata && pdev->dev.of_node) {
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pdata = of_get_platform_data(pdev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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if (!pdata)
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return -EBUSY;
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if (!pdata->irq_flags)
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return -EINVAL;
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data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->dev = &pdev->dev;
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data->pdata = pdata;
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/* Allocate the memory of extcon devie and register extcon device */
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data->edev = devm_extcon_dev_allocate(&pdev->dev,
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pdata->supported_cable);
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if (IS_ERR(data->edev)) {
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dev_err(&pdev->dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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data->edev->name = pdata->name;
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ret = devm_extcon_dev_register(&pdev->dev, data->edev);
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if (ret < 0)
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return ret;
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INIT_DELAYED_WORK(&data->work, gpio_extcon_work);
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if (!gpio_is_valid(pdata->gpio))
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goto skip_gpio;
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/* Initialize the gpio */
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ret = gpio_extcon_init(&pdev->dev, data);
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if (ret < 0)
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return ret;
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/*
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* Request the interrupt of gpio to detect whether external connector
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* is attached or detached.
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*/
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ret = devm_request_any_context_irq(&pdev->dev, data->irq,
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gpio_irq_handler, pdata->irq_flags,
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pdev->name, data);
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if (ret < 0)
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return ret;
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skip_gpio:
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platform_set_drvdata(pdev, data);
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/* Perform initial detection */
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gpio_extcon_work(&data->work.work);
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return 0;
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}
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static int gpio_extcon_remove(struct platform_device *pdev)
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{
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struct gpio_extcon_data *data = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&data->work);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int gpio_extcon_resume(struct device *dev)
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{
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struct gpio_extcon_data *data;
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data = dev_get_drvdata(dev);
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if (data->pdata->check_on_resume)
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queue_delayed_work(system_power_efficient_wq,
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&data->work, data->debounce_jiffies);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);
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static const struct of_device_id of_extcon_gpio_tbl[] = {
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{ .compatible = "extcon-gpio", },
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, of_extcon_gpio_tbl);
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static struct platform_driver gpio_extcon_driver = {
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.probe = gpio_extcon_probe,
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.remove = gpio_extcon_remove,
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.driver = {
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.name = "extcon-gpio",
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.pm = &gpio_extcon_pm_ops,
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.of_match_table = of_extcon_gpio_tbl,
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},
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};
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module_platform_driver(gpio_extcon_driver);
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MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
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MODULE_DESCRIPTION("GPIO extcon driver");
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MODULE_LICENSE("GPL");
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