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Release 4.11 drivers/input/misc/gp2ap002a00f.c

/*
 * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
 *
 * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
 * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/input/gp2ap002a00f.h>


struct gp2a_data {
	
struct input_dev *input;
	
const struct gp2a_platform_data *pdata;
	
struct i2c_client *i2c_client;
};


enum gp2a_addr {
	
GP2A_ADDR_PROX	= 0x0,
	
GP2A_ADDR_GAIN	= 0x1,
	
GP2A_ADDR_HYS	= 0x2,
	
GP2A_ADDR_CYCLE	= 0x3,
	
GP2A_ADDR_OPMOD	= 0x4,
	
GP2A_ADDR_CON	= 0x6
};


enum gp2a_controls {
	/* Software Shutdown control: 0 = shutdown, 1 = normal operation */
	
GP2A_CTRL_SSD	= 0x01
};


static int gp2a_report(struct gp2a_data *dt) { int vo = gpio_get_value(dt->pdata->vout_gpio); input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo); input_sync(dt->input); return 0; }

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static irqreturn_t gp2a_irq(int irq, void *handle) { struct gp2a_data *dt = handle; gp2a_report(dt); return IRQ_HANDLED; }

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static int gp2a_enable(struct gp2a_data *dt) { return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD, GP2A_CTRL_SSD); }

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static int gp2a_disable(struct gp2a_data *dt) { return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD, 0x00); }

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static int gp2a_device_open(struct input_dev *dev) { struct gp2a_data *dt = input_get_drvdata(dev); int error; error = gp2a_enable(dt); if (error < 0) { dev_err(&dt->i2c_client->dev, "unable to activate, err %d\n", error); return error; } gp2a_report(dt); return 0; }

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static void gp2a_device_close(struct input_dev *dev) { struct gp2a_data *dt = input_get_drvdata(dev); int error; error = gp2a_disable(dt); if (error < 0) dev_err(&dt->i2c_client->dev, "unable to deactivate, err %d\n", error); }

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static int gp2a_initialize(struct gp2a_data *dt) { int error; error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN, 0x08); if (error < 0) return error; error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS, 0xc2); if (error < 0) return error; error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE, 0x04); if (error < 0) return error; error = gp2a_disable(dt); return error; }

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static int gp2a_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev); struct gp2a_data *dt; int error; if (!pdata) return -EINVAL; if (pdata->hw_setup) { error = pdata->hw_setup(client); if (error < 0) return error; } error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME); if (error) goto err_hw_shutdown; dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL); if (!dt) { error = -ENOMEM; goto err_free_gpio; } dt->pdata = pdata; dt->i2c_client = client; error = gp2a_initialize(dt); if (error < 0) goto err_free_mem; dt->input = input_allocate_device(); if (!dt->input) { error = -ENOMEM; goto err_free_mem; } input_set_drvdata(dt->input, dt); dt->input->open = gp2a_device_open; dt->input->close = gp2a_device_close; dt->input->name = GP2A_I2C_NAME; dt->input->id.bustype = BUS_I2C; dt->input->dev.parent = &client->dev; input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY); error = request_threaded_irq(client->irq, NULL, gp2a_irq, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, GP2A_I2C_NAME, dt); if (error) { dev_err(&client->dev, "irq request failed\n"); goto err_free_input_dev; } error = input_register_device(dt->input); if (error) { dev_err(&client->dev, "device registration failed\n"); goto err_free_irq; } device_init_wakeup(&client->dev, pdata->wakeup); i2c_set_clientdata(client, dt); return 0; err_free_irq: free_irq(client->irq, dt); err_free_input_dev: input_free_device(dt->input); err_free_mem: kfree(dt); err_free_gpio: gpio_free(pdata->vout_gpio); err_hw_shutdown: if (pdata->hw_shutdown) pdata->hw_shutdown(client); return error; }

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static int gp2a_remove(struct i2c_client *client) { struct gp2a_data *dt = i2c_get_clientdata(client); const struct gp2a_platform_data *pdata = dt->pdata; free_irq(client->irq, dt); input_unregister_device(dt->input); kfree(dt); gpio_free(pdata->vout_gpio); if (pdata->hw_shutdown) pdata->hw_shutdown(client); return 0; }

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static int __maybe_unused gp2a_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct gp2a_data *dt = i2c_get_clientdata(client); int retval = 0; if (device_may_wakeup(&client->dev)) { enable_irq_wake(client->irq); } else { mutex_lock(&dt->input->mutex); if (dt->input->users) retval = gp2a_disable(dt); mutex_unlock(&dt->input->mutex); } return retval; }

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static int __maybe_unused gp2a_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct gp2a_data *dt = i2c_get_clientdata(client); int retval = 0; if (device_may_wakeup(&client->dev)) { disable_irq_wake(client->irq); } else { mutex_lock(&dt->input->mutex); if (dt->input->users) retval = gp2a_enable(dt); mutex_unlock(&dt->input->mutex); } return retval; }

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static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume); static const struct i2c_device_id gp2a_i2c_id[] = { { GP2A_I2C_NAME, 0 }, { } }; MODULE_DEVICE_TABLE(i2c, gp2a_i2c_id); static struct i2c_driver gp2a_i2c_driver = { .driver = { .name = GP2A_I2C_NAME, .pm = &gp2a_pm, }, .probe = gp2a_probe, .remove = gp2a_remove, .id_table = gp2a_i2c_id, }; module_i2c_driver(gp2a_i2c_driver); MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>"); MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver"); MODULE_LICENSE("GPL v2");

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