--- /dev/null
+/*
+ * 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;
+}
+
+static irqreturn_t gp2a_irq(int irq, void *handle)
+{
+ struct gp2a_data *dt = handle;
+
+ gp2a_report(dt);
+
+ return IRQ_HANDLED;
+}
+
+static int gp2a_enable(struct gp2a_data *dt)
+{
+ return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
+ GP2A_CTRL_SSD);
+}
+
+static int gp2a_disable(struct gp2a_data *dt)
+{
+ return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
+ 0x00);
+}
+
+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;
+}
+
+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);
+}
+
+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;
+}
+
+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;
+}
+
+static int gp2a_remove(struct i2c_client *client)
+{
+ struct gp2a_data *dt = i2c_get_clientdata(client);
+ const struct gp2a_platform_data *pdata = dt->pdata;
+
+ device_init_wakeup(&client->dev, false);
+
+ 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;
+}
+
+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;
+}
+
+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;
+}
+
+static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
+
+static const struct i2c_device_id gp2a_i2c_id[] = {
+ { GP2A_I2C_NAME, 0 },
+ { }
+};
+
+static struct i2c_driver gp2a_i2c_driver = {
+ .driver = {
+ .name = GP2A_I2C_NAME,
+ .owner = THIS_MODULE,
+ .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");
Code Review / kvmfornfv.git / blobdiff