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 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 gp2a_probe(struct i2c_client *client,
126				const struct i2c_device_id *id)
127{
128	const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev);
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 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
228static int __maybe_unused gp2a_suspend(struct device *dev)
229{
230	struct i2c_client *client = to_i2c_client(dev);
231	struct gp2a_data *dt = i2c_get_clientdata(client);
232	int retval = 0;
233
234	if (device_may_wakeup(&client->dev)) {
235		enable_irq_wake(client->irq);
236	} else {
237		mutex_lock(&dt->input->mutex);
238		if (dt->input->users)
239			retval = gp2a_disable(dt);
240		mutex_unlock(&dt->input->mutex);
241	}
242
243	return retval;
244}
245
246static int __maybe_unused gp2a_resume(struct device *dev)
247{
248	struct i2c_client *client = to_i2c_client(dev);
249	struct gp2a_data *dt = i2c_get_clientdata(client);
250	int retval = 0;
251
252	if (device_may_wakeup(&client->dev)) {
253		disable_irq_wake(client->irq);
254	} else {
255		mutex_lock(&dt->input->mutex);
256		if (dt->input->users)
257			retval = gp2a_enable(dt);
258		mutex_unlock(&dt->input->mutex);
259	}
260
261	return retval;
262}
263
264static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
265
266static const struct i2c_device_id gp2a_i2c_id[] = {
267	{ GP2A_I2C_NAME, 0 },
268	{ }
269};
270MODULE_DEVICE_TABLE(i2c, gp2a_i2c_id);
271
272static struct i2c_driver gp2a_i2c_driver = {
273	.driver = {
274		.name	= GP2A_I2C_NAME,
275		.pm	= &gp2a_pm,
276	},
277	.probe		= gp2a_probe,
278	.remove		= gp2a_remove,
279	.id_table	= gp2a_i2c_id,
280};
281
282module_i2c_driver(gp2a_i2c_driver);
283
284MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
285MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
286MODULE_LICENSE("GPL v2");
287