1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * kernel/drivers/input/sensors/psensor/ps_em3071x.c
4 *
5 * Copyright (C) 2020 Rockchip Co.,Ltd.
6 * Author: Wang Jie <dave.wang@rock-chips.com>
7 */
8
9 #include <linux/interrupt.h>
10 #include <linux/i2c.h>
11 #include <linux/slab.h>
12 #include <linux/irq.h>
13 #include <linux/miscdevice.h>
14 #include <linux/gpio.h>
15 #include <linux/uaccess.h>
16 #include <linux/atomic.h>
17 #include <linux/delay.h>
18 #include <linux/input.h>
19 #include <linux/workqueue.h>
20 #include <linux/freezer.h>
21 #include <linux/of_gpio.h>
22 #ifdef CONFIG_HAS_EARLYSUSPEND
23 #include <linux/earlysuspend.h>
24 #endif
25 #include <linux/sensor-dev.h>
26
27 #define EM3071X_CONFIG_REG 0x01
28 #define EM3071X_INT_REG 0x02
29 #define EM3071X_PS_L_REG 0x03
30 #define EM3071X_PS_H_REG 0x04
31 #define EM3071X_PS_REG 0x08
32 #define EM3071X_INT_PMASK 0x80
33 #define EM3071X_PS_OFFSET 0x0F
34
35 #define EM3071X_PS_CONFIG 0xB0
36 /* #define ps_threshold_low 0x30 */
37 /* #define ps_threshold_high 0x40 */
38 #define EM3071X_INT_CLEAR 0x00
39
40 static int ps_threshold_low;
41 static int ps_threshold_high;
42
em3071x_get_object(struct i2c_client * client)43 static int em3071x_get_object(struct i2c_client *client)
44 {
45 int index = 0;
46 int val;
47
48 val = sensor_read_reg(client, EM3071X_PS_REG);
49
50 if (val >= ps_threshold_high) {
51 index = 0;
52 val = 0;
53 } else if (val <= ps_threshold_low) {
54 index = 1;
55 val = 1;
56 } else {
57 index = val;
58 }
59
60 dev_dbg(&client->dev,
61 "%s: val = 0x%x, index = %d\n", __func__, val, index);
62
63 return index;
64 }
65
sensor_active(struct i2c_client * client,int enable,int rate)66 static int sensor_active(struct i2c_client *client, int enable, int rate)
67 {
68 struct sensor_private_data *sensor =
69 (struct sensor_private_data *) i2c_get_clientdata(client);
70 int result = 0;
71 int status = 0;
72
73 sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
74 if (enable) {
75 status = EM3071X_PS_CONFIG;
76 sensor->ops->ctrl_data |= status;
77 } else {
78 status = ~EM3071X_PS_CONFIG;
79 sensor->ops->ctrl_data &= status;
80 }
81
82 result = sensor_write_reg(client, sensor->ops->ctrl_reg,
83 sensor->ops->ctrl_data);
84 if (result)
85 dev_err(&client->dev, "%s: fail to active sensor\n", __func__);
86
87 return result;
88
89 }
90
em3071x_set_threshold(struct i2c_client * client,int threshold_high,int threshold_low)91 static int em3071x_set_threshold(struct i2c_client *client,
92 int threshold_high, int threshold_low)
93 {
94 int result = 0;
95
96 result = sensor_write_reg(client, EM3071X_PS_L_REG, threshold_low);
97 if (result) {
98 dev_err(&client->dev,
99 "%s: fail to write EM3071X_PS_L_REG(%d)\n",
100 __func__, result);
101 return result;
102 }
103
104 result = sensor_write_reg(client, EM3071X_PS_H_REG, threshold_high);
105 if (result) {
106 dev_err(&client->dev,
107 "%s: fail to write EM3071X_PS_H_REG(%d)\n",
108 __func__, result);
109 return result;
110 }
111
112 dev_dbg(&client->dev,
113 "%s: set threshold_high = %d, set threshold_low = %d\n",
114 __func__, threshold_high, threshold_low);
115 return result;
116 }
117
sensor_init(struct i2c_client * client)118 static int sensor_init(struct i2c_client *client)
119 {
120 struct sensor_private_data *sensor =
121 (struct sensor_private_data *) i2c_get_clientdata(client);
122 struct device_node *np = client->dev.of_node;
123 int ps_val = 0;
124 int ret = 0;
125 int result = 0;
126
127 result = sensor->ops->active(client, 0, 0);
128 if (result) {
129 dev_err(&client->dev, "%s: line = %d, result = %d.\n",
130 __func__, __LINE__, result);
131 return result;
132 }
133 sensor->status_cur = SENSOR_OFF;
134
135 /* initialize the EM3071X chip */
136 result = sensor_write_reg(client, EM3071X_CONFIG_REG, 0X00);
137 if (result) {
138 dev_err(&client->dev,
139 "%s: write EM3071X_CONFIG_REG reg fail(%d)\n",
140 __func__, result);
141 return result;
142 }
143
144 result = sensor_write_reg(client, EM3071X_INT_REG, EM3071X_INT_CLEAR);
145 if (result) {
146 dev_err(&client->dev,
147 "%s: write EM3071X_INT_REG reg fail(%d)\n",
148 __func__, result);
149 return result;
150 }
151
152 result = sensor_write_reg(client, EM3071X_PS_OFFSET, 0X00);
153 if (result) {
154 dev_err(&client->dev,
155 "%s: write EM3071X_PS_OFFSET reg fail(%d)\n",
156 __func__, result);
157 return result;
158 }
159
160 ret = of_property_read_u32(np, "ps_threshold_low", &ps_val);
161 if (ret)
162 dev_warn(&client->dev,
163 "%s: Unable to get ps_threshold_low\n", __func__);
164
165 ps_threshold_low = ps_val;
166
167 ret = of_property_read_u32(np, "ps_threshold_high", &ps_val);
168 if (ret)
169 dev_warn(&client->dev,
170 "%s: Unable to get ps_threshold_high\n", __func__);
171
172 ps_threshold_high = ps_val;
173
174 ret = em3071x_set_threshold(client,
175 ps_threshold_high, ps_threshold_low);
176 if (ret)
177 dev_err(&client->dev,
178 "%s: em3071x set threshold failed\n", __func__);
179
180 return result;
181 }
182
em3071x_get_status(struct i2c_client * client)183 static int em3071x_get_status(struct i2c_client *client)
184 {
185 struct sensor_private_data *sensor =
186 (struct sensor_private_data *) i2c_get_clientdata(client);
187 int val;
188
189 val = sensor_read_reg(client, sensor->ops->int_status_reg);
190 val &= 0x80;
191
192 return val;
193 }
194
sensor_report_value(struct i2c_client * client)195 static int sensor_report_value(struct i2c_client *client)
196 {
197 struct sensor_private_data *sensor =
198 (struct sensor_private_data *) i2c_get_clientdata(client);
199 int result = 0;
200 char value = 0;
201 u8 status;
202
203 status = em3071x_get_status(client);
204 dev_dbg(&client->dev, "em3071x_get_status: status = 0x%x\n", status);
205
206 if (sensor->pdata->irq_enable) {
207 if (status & EM3071X_INT_PMASK) {
208 result = sensor_write_reg(client, EM3071X_INT_REG, 0x00);
209 if (result) {
210 dev_err(&client->dev,
211 "%s: write EM3071X_INT_REG reg fail(%d)\n", __func__, result);
212 return result;
213 }
214
215 value = em3071x_get_object(client);
216 input_report_abs(sensor->input_dev, ABS_DISTANCE, value);
217 input_sync(sensor->input_dev);
218 }
219 } else {
220 value = em3071x_get_object(client);
221 input_report_abs(sensor->input_dev, ABS_DISTANCE, value);
222 input_sync(sensor->input_dev);
223 }
224
225 return result;
226 }
227
228 static struct sensor_operate psensor_em3071x_ops = {
229 .name = "ps_em3071x",
230 .type = SENSOR_TYPE_PROXIMITY,
231 .id_i2c = PROXIMITY_ID_EM3071X,
232 .read_reg = SENSOR_UNKNOW_DATA,
233 .read_len = 1,
234 .id_reg = 0,
235 .id_data = 0x31,
236 .precision = 8,
237 .ctrl_reg = 0x01,
238 .int_status_reg = 0x02,
239 .range = {0, 10},
240 .brightness = {10, 255},
241 .trig = IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
242 .active = sensor_active,
243 .init = sensor_init,
244 .report = sensor_report_value,
245 };
246
proximity_em3071x_probe(struct i2c_client * client,const struct i2c_device_id * devid)247 static int proximity_em3071x_probe(struct i2c_client *client,
248 const struct i2c_device_id *devid)
249 {
250 return sensor_register_device(client, NULL, devid, &psensor_em3071x_ops);
251 }
252
proximity_em3071x_remove(struct i2c_client * client)253 static int proximity_em3071x_remove(struct i2c_client *client)
254 {
255 return sensor_unregister_device(client, NULL, &psensor_em3071x_ops);
256 }
257
258 static const struct i2c_device_id proximity_em3071x_id[] = {
259 {"ps_em3071x", PROXIMITY_ID_EM3071X},
260 {}
261 };
262
263 static struct i2c_driver proximity_em3071x_driver = {
264 .probe = proximity_em3071x_probe,
265 .remove = proximity_em3071x_remove,
266 .shutdown = sensor_shutdown,
267 .id_table = proximity_em3071x_id,
268 .driver = {
269 .name = "proximity_em3071x",
270 #ifdef CONFIG_PM
271 .pm = &sensor_pm_ops,
272 #endif
273 },
274 };
275
276 module_i2c_driver(proximity_em3071x_driver);
277
278 MODULE_AUTHOR("Wang Jie <dave.wang@rock-chips.com>");
279 MODULE_DESCRIPTION("em3071x proximity driver");
280 MODULE_LICENSE("GPL");
281