![Guenter Roeck](/assets/img/avatar_default.png)
Calling device_init_wakeup in the remove function is unnecessary since the device is going away, and thus won't be able to cause any wakeups under any circumstances. Besides, the driver cleanup code already handles the necessary cleanup. Similarly, disabling wakeup in the probe error path is unnecessary, as is disabling wakeup in the probe function in the first place. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
285 lines
6 KiB
C
285 lines
6 KiB
C
/*
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* Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
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*
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* Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
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* Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*/
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/input/gp2ap002a00f.h>
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struct gp2a_data {
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struct input_dev *input;
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const struct gp2a_platform_data *pdata;
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struct i2c_client *i2c_client;
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};
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enum gp2a_addr {
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GP2A_ADDR_PROX = 0x0,
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GP2A_ADDR_GAIN = 0x1,
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GP2A_ADDR_HYS = 0x2,
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GP2A_ADDR_CYCLE = 0x3,
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GP2A_ADDR_OPMOD = 0x4,
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GP2A_ADDR_CON = 0x6
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};
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enum gp2a_controls {
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/* Software Shutdown control: 0 = shutdown, 1 = normal operation */
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GP2A_CTRL_SSD = 0x01
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};
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static int gp2a_report(struct gp2a_data *dt)
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{
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int vo = gpio_get_value(dt->pdata->vout_gpio);
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input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);
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input_sync(dt->input);
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return 0;
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}
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static irqreturn_t gp2a_irq(int irq, void *handle)
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{
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struct gp2a_data *dt = handle;
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gp2a_report(dt);
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return IRQ_HANDLED;
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}
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static int gp2a_enable(struct gp2a_data *dt)
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{
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return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
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GP2A_CTRL_SSD);
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}
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static int gp2a_disable(struct gp2a_data *dt)
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{
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return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
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0x00);
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}
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static int gp2a_device_open(struct input_dev *dev)
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{
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struct gp2a_data *dt = input_get_drvdata(dev);
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int error;
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error = gp2a_enable(dt);
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if (error < 0) {
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dev_err(&dt->i2c_client->dev,
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"unable to activate, err %d\n", error);
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return error;
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}
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gp2a_report(dt);
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return 0;
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}
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static void gp2a_device_close(struct input_dev *dev)
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{
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struct gp2a_data *dt = input_get_drvdata(dev);
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int error;
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error = gp2a_disable(dt);
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if (error < 0)
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dev_err(&dt->i2c_client->dev,
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"unable to deactivate, err %d\n", error);
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}
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static int gp2a_initialize(struct gp2a_data *dt)
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{
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int error;
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error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN,
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0x08);
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if (error < 0)
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return error;
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error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS,
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0xc2);
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if (error < 0)
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return error;
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error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE,
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0x04);
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if (error < 0)
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return error;
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error = gp2a_disable(dt);
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return error;
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}
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static int gp2a_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev);
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struct gp2a_data *dt;
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int error;
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if (!pdata)
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return -EINVAL;
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if (pdata->hw_setup) {
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error = pdata->hw_setup(client);
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if (error < 0)
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return error;
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}
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error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME);
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if (error)
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goto err_hw_shutdown;
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dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
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if (!dt) {
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error = -ENOMEM;
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goto err_free_gpio;
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}
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dt->pdata = pdata;
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dt->i2c_client = client;
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error = gp2a_initialize(dt);
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if (error < 0)
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goto err_free_mem;
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dt->input = input_allocate_device();
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if (!dt->input) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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input_set_drvdata(dt->input, dt);
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dt->input->open = gp2a_device_open;
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dt->input->close = gp2a_device_close;
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dt->input->name = GP2A_I2C_NAME;
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dt->input->id.bustype = BUS_I2C;
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dt->input->dev.parent = &client->dev;
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input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY);
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error = request_threaded_irq(client->irq, NULL, gp2a_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
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GP2A_I2C_NAME, dt);
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if (error) {
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dev_err(&client->dev, "irq request failed\n");
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goto err_free_input_dev;
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}
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error = input_register_device(dt->input);
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if (error) {
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dev_err(&client->dev, "device registration failed\n");
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goto err_free_irq;
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}
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device_init_wakeup(&client->dev, pdata->wakeup);
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i2c_set_clientdata(client, dt);
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return 0;
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err_free_irq:
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free_irq(client->irq, dt);
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err_free_input_dev:
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input_free_device(dt->input);
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err_free_mem:
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kfree(dt);
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err_free_gpio:
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gpio_free(pdata->vout_gpio);
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err_hw_shutdown:
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if (pdata->hw_shutdown)
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pdata->hw_shutdown(client);
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return error;
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}
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static int gp2a_remove(struct i2c_client *client)
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{
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struct gp2a_data *dt = i2c_get_clientdata(client);
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const struct gp2a_platform_data *pdata = dt->pdata;
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free_irq(client->irq, dt);
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input_unregister_device(dt->input);
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kfree(dt);
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gpio_free(pdata->vout_gpio);
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if (pdata->hw_shutdown)
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pdata->hw_shutdown(client);
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return 0;
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}
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static int __maybe_unused gp2a_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct gp2a_data *dt = i2c_get_clientdata(client);
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int retval = 0;
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if (device_may_wakeup(&client->dev)) {
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enable_irq_wake(client->irq);
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} else {
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mutex_lock(&dt->input->mutex);
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if (dt->input->users)
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retval = gp2a_disable(dt);
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mutex_unlock(&dt->input->mutex);
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}
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return retval;
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}
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static int __maybe_unused gp2a_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct gp2a_data *dt = i2c_get_clientdata(client);
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int retval = 0;
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if (device_may_wakeup(&client->dev)) {
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disable_irq_wake(client->irq);
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} else {
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mutex_lock(&dt->input->mutex);
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if (dt->input->users)
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retval = gp2a_enable(dt);
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mutex_unlock(&dt->input->mutex);
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}
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return retval;
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}
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static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
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static const struct i2c_device_id gp2a_i2c_id[] = {
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{ GP2A_I2C_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, gp2a_i2c_id);
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static struct i2c_driver gp2a_i2c_driver = {
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.driver = {
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.name = GP2A_I2C_NAME,
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.pm = &gp2a_pm,
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},
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.probe = gp2a_probe,
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.remove = gp2a_remove,
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.id_table = gp2a_i2c_id,
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};
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module_i2c_driver(gp2a_i2c_driver);
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MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
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MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
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MODULE_LICENSE("GPL v2");
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