1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2011 Sony Ericsson Mobile Communications Inc.
4 *
5 * Author: Courtney Cavin <courtney.cavin@sonyericsson.com>
6 * Prepared for up-stream by: Oskar Andero <oskar.andero@sonyericsson.com>
7 */
8
9 #include <linux/i2c.h>
10 #include <linux/irq.h>
11 #include <linux/slab.h>
12 #include <linux/input.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/gpio.h>
16 #include <linux/delay.h>
17 #include <linux/input/gp2ap002a00f.h>
18
19 struct gp2a_data {
20 struct input_dev *input;
21 const struct gp2a_platform_data *pdata;
22 struct i2c_client *i2c_client;
23 };
24
25 enum gp2a_addr {
26 GP2A_ADDR_PROX = 0x0,
27 GP2A_ADDR_GAIN = 0x1,
28 GP2A_ADDR_HYS = 0x2,
29 GP2A_ADDR_CYCLE = 0x3,
30 GP2A_ADDR_OPMOD = 0x4,
31 GP2A_ADDR_CON = 0x6
32 };
33
34 enum gp2a_controls {
35 /* Software Shutdown control: 0 = shutdown, 1 = normal operation */
36 GP2A_CTRL_SSD = 0x01
37 };
38
gp2a_report(struct gp2a_data * dt)39 static int gp2a_report(struct gp2a_data *dt)
40 {
41 int vo = gpio_get_value(dt->pdata->vout_gpio);
42
43 input_report_switch(dt->input, SW_FRONT_PROXIMITY, !vo);
44 input_sync(dt->input);
45
46 return 0;
47 }
48
gp2a_irq(int irq,void * handle)49 static irqreturn_t gp2a_irq(int irq, void *handle)
50 {
51 struct gp2a_data *dt = handle;
52
53 gp2a_report(dt);
54
55 return IRQ_HANDLED;
56 }
57
gp2a_enable(struct gp2a_data * dt)58 static int gp2a_enable(struct gp2a_data *dt)
59 {
60 return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
61 GP2A_CTRL_SSD);
62 }
63
gp2a_disable(struct gp2a_data * dt)64 static int gp2a_disable(struct gp2a_data *dt)
65 {
66 return i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_OPMOD,
67 0x00);
68 }
69
gp2a_device_open(struct input_dev * dev)70 static int gp2a_device_open(struct input_dev *dev)
71 {
72 struct gp2a_data *dt = input_get_drvdata(dev);
73 int error;
74
75 error = gp2a_enable(dt);
76 if (error < 0) {
77 dev_err(&dt->i2c_client->dev,
78 "unable to activate, err %d\n", error);
79 return error;
80 }
81
82 gp2a_report(dt);
83
84 return 0;
85 }
86
gp2a_device_close(struct input_dev * dev)87 static void gp2a_device_close(struct input_dev *dev)
88 {
89 struct gp2a_data *dt = input_get_drvdata(dev);
90 int error;
91
92 error = gp2a_disable(dt);
93 if (error < 0)
94 dev_err(&dt->i2c_client->dev,
95 "unable to deactivate, err %d\n", error);
96 }
97
gp2a_initialize(struct gp2a_data * dt)98 static int gp2a_initialize(struct gp2a_data *dt)
99 {
100 int error;
101
102 error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_GAIN,
103 0x08);
104 if (error < 0)
105 return error;
106
107 error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_HYS,
108 0xc2);
109 if (error < 0)
110 return error;
111
112 error = i2c_smbus_write_byte_data(dt->i2c_client, GP2A_ADDR_CYCLE,
113 0x04);
114 if (error < 0)
115 return error;
116
117 error = gp2a_disable(dt);
118
119 return error;
120 }
121
gp2a_probe(struct i2c_client * client,const struct i2c_device_id * id)122 static int gp2a_probe(struct i2c_client *client,
123 const struct i2c_device_id *id)
124 {
125 const struct gp2a_platform_data *pdata = dev_get_platdata(&client->dev);
126 struct gp2a_data *dt;
127 int error;
128
129 if (!pdata)
130 return -EINVAL;
131
132 if (pdata->hw_setup) {
133 error = pdata->hw_setup(client);
134 if (error < 0)
135 return error;
136 }
137
138 error = gpio_request_one(pdata->vout_gpio, GPIOF_IN, GP2A_I2C_NAME);
139 if (error)
140 goto err_hw_shutdown;
141
142 dt = kzalloc(sizeof(struct gp2a_data), GFP_KERNEL);
143 if (!dt) {
144 error = -ENOMEM;
145 goto err_free_gpio;
146 }
147
148 dt->pdata = pdata;
149 dt->i2c_client = client;
150
151 error = gp2a_initialize(dt);
152 if (error < 0)
153 goto err_free_mem;
154
155 dt->input = input_allocate_device();
156 if (!dt->input) {
157 error = -ENOMEM;
158 goto err_free_mem;
159 }
160
161 input_set_drvdata(dt->input, dt);
162
163 dt->input->open = gp2a_device_open;
164 dt->input->close = gp2a_device_close;
165 dt->input->name = GP2A_I2C_NAME;
166 dt->input->id.bustype = BUS_I2C;
167 dt->input->dev.parent = &client->dev;
168
169 input_set_capability(dt->input, EV_SW, SW_FRONT_PROXIMITY);
170
171 error = request_threaded_irq(client->irq, NULL, gp2a_irq,
172 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
173 IRQF_ONESHOT,
174 GP2A_I2C_NAME, dt);
175 if (error) {
176 dev_err(&client->dev, "irq request failed\n");
177 goto err_free_input_dev;
178 }
179
180 error = input_register_device(dt->input);
181 if (error) {
182 dev_err(&client->dev, "device registration failed\n");
183 goto err_free_irq;
184 }
185
186 device_init_wakeup(&client->dev, pdata->wakeup);
187 i2c_set_clientdata(client, dt);
188
189 return 0;
190
191 err_free_irq:
192 free_irq(client->irq, dt);
193 err_free_input_dev:
194 input_free_device(dt->input);
195 err_free_mem:
196 kfree(dt);
197 err_free_gpio:
198 gpio_free(pdata->vout_gpio);
199 err_hw_shutdown:
200 if (pdata->hw_shutdown)
201 pdata->hw_shutdown(client);
202 return error;
203 }
204
gp2a_remove(struct i2c_client * client)205 static int gp2a_remove(struct i2c_client *client)
206 {
207 struct gp2a_data *dt = i2c_get_clientdata(client);
208 const struct gp2a_platform_data *pdata = dt->pdata;
209
210 free_irq(client->irq, dt);
211
212 input_unregister_device(dt->input);
213 kfree(dt);
214
215 gpio_free(pdata->vout_gpio);
216
217 if (pdata->hw_shutdown)
218 pdata->hw_shutdown(client);
219
220 return 0;
221 }
222
gp2a_suspend(struct device * dev)223 static int __maybe_unused gp2a_suspend(struct device *dev)
224 {
225 struct i2c_client *client = to_i2c_client(dev);
226 struct gp2a_data *dt = i2c_get_clientdata(client);
227 int retval = 0;
228
229 if (device_may_wakeup(&client->dev)) {
230 enable_irq_wake(client->irq);
231 } else {
232 mutex_lock(&dt->input->mutex);
233 if (dt->input->users)
234 retval = gp2a_disable(dt);
235 mutex_unlock(&dt->input->mutex);
236 }
237
238 return retval;
239 }
240
gp2a_resume(struct device * dev)241 static int __maybe_unused gp2a_resume(struct device *dev)
242 {
243 struct i2c_client *client = to_i2c_client(dev);
244 struct gp2a_data *dt = i2c_get_clientdata(client);
245 int retval = 0;
246
247 if (device_may_wakeup(&client->dev)) {
248 disable_irq_wake(client->irq);
249 } else {
250 mutex_lock(&dt->input->mutex);
251 if (dt->input->users)
252 retval = gp2a_enable(dt);
253 mutex_unlock(&dt->input->mutex);
254 }
255
256 return retval;
257 }
258
259 static SIMPLE_DEV_PM_OPS(gp2a_pm, gp2a_suspend, gp2a_resume);
260
261 static const struct i2c_device_id gp2a_i2c_id[] = {
262 { GP2A_I2C_NAME, 0 },
263 { }
264 };
265 MODULE_DEVICE_TABLE(i2c, gp2a_i2c_id);
266
267 static struct i2c_driver gp2a_i2c_driver = {
268 .driver = {
269 .name = GP2A_I2C_NAME,
270 .pm = &gp2a_pm,
271 },
272 .probe = gp2a_probe,
273 .remove = gp2a_remove,
274 .id_table = gp2a_i2c_id,
275 };
276
277 module_i2c_driver(gp2a_i2c_driver);
278
279 MODULE_AUTHOR("Courtney Cavin <courtney.cavin@sonyericsson.com>");
280 MODULE_DESCRIPTION("Sharp GP2AP002A00F I2C Proximity/Opto sensor driver");
281 MODULE_LICENSE("GPL v2");
282