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
22 struct gp2a_data {
23 struct input_dev *input;
24 const struct gp2a_platform_data *pdata;
25 struct i2c_client *i2c_client;
26 };
27
28 enum 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
37 enum gp2a_controls {
38 /* Software Shutdown control: 0 = shutdown, 1 = normal operation */
39 GP2A_CTRL_SSD = 0x01
40 };
41
gp2a_report(struct gp2a_data * dt)42 static 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
gp2a_irq(int irq,void * handle)52 static 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
gp2a_enable(struct gp2a_data * dt)61 static 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
gp2a_disable(struct gp2a_data * dt)67 static 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
gp2a_device_open(struct input_dev * dev)73 static 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
gp2a_device_close(struct input_dev * dev)90 static 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
gp2a_initialize(struct gp2a_data * dt)101 static 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
gp2a_probe(struct i2c_client * client,const struct i2c_device_id * id)125 static 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
194 err_free_irq:
195 free_irq(client->irq, dt);
196 err_free_input_dev:
197 input_free_device(dt->input);
198 err_free_mem:
199 kfree(dt);
200 err_free_gpio:
201 gpio_free(pdata->vout_gpio);
202 err_hw_shutdown:
203 if (pdata->hw_shutdown)
204 pdata->hw_shutdown(client);
205 return error;
206 }
207
gp2a_remove(struct i2c_client * client)208 static 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
gp2a_suspend(struct device * dev)229 static 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
gp2a_resume(struct device * dev)247 static 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
266 static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
267
268 static const struct i2c_device_id gp2a_i2c_id[] = {
269 { GP2A_I2C_NAME, 0 },
270 { }
271 };
272
273 static 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
284 module_i2c_driver(gp2a_i2c_driver);
285
286 MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
287 MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
288 MODULE_LICENSE("GPL v2");
289