1/*
  2 * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
  3 *
  4 * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
  5 * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2, as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/i2c.h>
 13#include <linux/irq.h>
 14#include <linux/slab.h>
 15#include <linux/input.h>
 16#include <linux/module.h>
 17#include <linux/interrupt.h>
 18#include <linux/gpio.h>
 19#include <linux/delay.h>
 20#include <linux/input/gp2ap002a00f.h>
 21
 22struct gp2a_data {
 23	struct input_dev *input;
 24	const struct gp2a_platform_data *pdata;
 25	struct i2c_client *i2c_client;
 26};
 27
 28enum gp2a_addr {
 29	GP2A_ADDR_PROX	= 0x0,
 30	GP2A_ADDR_GAIN	= 0x1,
 31	GP2A_ADDR_HYS	= 0x2,
 32	GP2A_ADDR_CYCLE	= 0x3,
 33	GP2A_ADDR_OPMOD	= 0x4,
 34	GP2A_ADDR_CON	= 0x6
 35};
 36
 37enum gp2a_controls {
 38	/* Software Shutdown control: 0 = shutdown, 1 = normal operation */
 39	GP2A_CTRL_SSD	= 0x01
 40};
 41
 42static int gp2a_report(struct gp2a_data *dt)
 43{
 44	int vo = gpio_get_value(dt->pdata->vout_gpio);
 45
 46	input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);
 47	input_sync(dt->input);
 48
 49	return 0;
 50}
 51
 52static irqreturn_t gp2a_irq(int irq, void *handle)
 53{
 54	struct gp2a_data *dt = handle;
 55
 56	gp2a_report(dt);
 57
 58	return IRQ_HANDLED;
 59}
 60
 61static int gp2a_enable(struct gp2a_data *dt)
 62{
 63	return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
 64					 GP2A_CTRL_SSD);
 65}
 66
 67static int gp2a_disable(struct gp2a_data *dt)
 68{
 69	return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
 70					 0x00);
 71}
 72
 73static int gp2a_device_open(struct input_dev *dev)
 74{
 75	struct gp2a_data *dt = input_get_drvdata(dev);
 76	int error;
 77
 78	error = gp2a_enable(dt);
 79	if (error < 0) {
 80		dev_err(&dt->i2c_client->dev,
 81			"unable to activate, err %d\n", error);
 82		return error;
 83	}
 84
 85	gp2a_report(dt);
 86
 87	return 0;
 88}
 89
 90static void gp2a_device_close(struct input_dev *dev)
 91{
 92	struct gp2a_data *dt = input_get_drvdata(dev);
 93	int error;
 94
 95	error = gp2a_disable(dt);
 96	if (error < 0)
 97		dev_err(&dt->i2c_client->dev,
 98			"unable to deactivate, err %d\n", error);
 99}
100
101static int __devinit gp2a_initialize(struct gp2a_data *dt)
102{
103	int error;
104
105	error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN,
106					  0x08);
107	if (error < 0)
108		return error;
109
110	error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS,
111					  0xc2);
112	if (error < 0)
113		return error;
114
115	error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE,
116					  0x04);
117	if (error < 0)
118		return error;
119
120	error = gp2a_disable(dt);
121
122	return error;
123}
124
125static int __devinit gp2a_probe(struct i2c_client *client,
126				const struct i2c_device_id *id)
127{
128	const struct gp2a_platform_data *pdata = client->dev.platform_data;
129	struct gp2a_data *dt;
130	int error;
131
132	if (!pdata)
133		return -EINVAL;
134
135	if (pdata->hw_setup) {
136		error = pdata->hw_setup(client);
137		if (error < 0)
138			return error;
139	}
140
141	error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME);
142	if (error)
143		goto err_hw_shutdown;
144
145	dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
146	if (!dt) {
147		error = -ENOMEM;
148		goto err_free_gpio;
149	}
150
151	dt->pdata = pdata;
152	dt->i2c_client = client;
153
154	error = gp2a_initialize(dt);
155	if (error < 0)
156		goto err_free_mem;
157
158	dt->input = input_allocate_device();
159	if (!dt->input) {
160		error = -ENOMEM;
161		goto err_free_mem;
162	}
163
164	input_set_drvdata(dt->input, dt);
165
166	dt->input->open = gp2a_device_open;
167	dt->input->close = gp2a_device_close;
168	dt->input->name = GP2A_I2C_NAME;
169	dt->input->id.bustype = BUS_I2C;
170	dt->input->dev.parent = &client->dev;
171
172	input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY);
173
174	error = request_threaded_irq(client->irq, NULL, gp2a_irq,
175			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
176				IRQF_ONESHOT,
177			GP2A_I2C_NAME, dt);
178	if (error) {
179		dev_err(&client->dev, "irq request failed\n");
180		goto err_free_input_dev;
181	}
182
183	error = input_register_device(dt->input);
184	if (error) {
185		dev_err(&client->dev, "device registration failed\n");
186		goto err_free_irq;
187	}
188
189	device_init_wakeup(&client->dev, pdata->wakeup);
190	i2c_set_clientdata(client, dt);
191
192	return 0;
193
194err_free_irq:
195	free_irq(client->irq, dt);
196err_free_input_dev:
197	input_free_device(dt->input);
198err_free_mem:
199	kfree(dt);
200err_free_gpio:
201	gpio_free(pdata->vout_gpio);
202err_hw_shutdown:
203	if (pdata->hw_shutdown)
204		pdata->hw_shutdown(client);
205	return error;
206}
207
208static int __devexit gp2a_remove(struct i2c_client *client)
209{
210	struct gp2a_data *dt = i2c_get_clientdata(client);
211	const struct gp2a_platform_data *pdata = dt->pdata;
212
213	device_init_wakeup(&client->dev, false);
214
215	free_irq(client->irq, dt);
216
217	input_unregister_device(dt->input);
218	kfree(dt);
219
220	gpio_free(pdata->vout_gpio);
221
222	if (pdata->hw_shutdown)
223		pdata->hw_shutdown(client);
224
225	return 0;
226}
227
228#ifdef CONFIG_PM_SLEEP
229static int gp2a_suspend(struct device *dev)
230{
231	struct i2c_client *client = to_i2c_client(dev);
232	struct gp2a_data *dt = i2c_get_clientdata(client);
233	int retval = 0;
234
235	if (device_may_wakeup(&client->dev)) {
236		enable_irq_wake(client->irq);
237	} else {
238		mutex_lock(&dt->input->mutex);
239		if (dt->input->users)
240			retval = gp2a_disable(dt);
241		mutex_unlock(&dt->input->mutex);
242	}
243
244	return retval;
245}
246
247static int gp2a_resume(struct device *dev)
248{
249	struct i2c_client *client = to_i2c_client(dev);
250	struct gp2a_data *dt = i2c_get_clientdata(client);
251	int retval = 0;
252
253	if (device_may_wakeup(&client->dev)) {
254		disable_irq_wake(client->irq);
255	} else {
256		mutex_lock(&dt->input->mutex);
257		if (dt->input->users)
258			retval = gp2a_enable(dt);
259		mutex_unlock(&dt->input->mutex);
260	}
261
262	return retval;
263}
264#endif
265
266static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
267
268static const struct i2c_device_id gp2a_i2c_id[] = {
269	{ GP2A_I2C_NAME, 0 },
270	{ }
271};
272
273static struct i2c_driver gp2a_i2c_driver = {
274	.driver = {
275		.name	= GP2A_I2C_NAME,
276		.owner	= THIS_MODULE,
277		.pm	= &gp2a_pm,
278	},
279	.probe		= gp2a_probe,
280	.remove		= __devexit_p(gp2a_remove),
281	.id_table	= gp2a_i2c_id,
282};
283
284module_i2c_driver(gp2a_i2c_driver);
285
286MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
287MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
288MODULE_LICENSE("GPL v2");