1 /* drivers/input/sensors/access/angle_kxtik.c
2 *
3 * Copyright (C) 2012-2015 ROCKCHIP.
4 * Author: luowei <lw@rock-chips.com>
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16 #include <linux/interrupt.h>
17 #include <linux/i2c.h>
18 #include <linux/slab.h>
19 #include <linux/irq.h>
20 #include <linux/miscdevice.h>
21 #include <linux/gpio.h>
22 #include <linux/uaccess.h>
23 #include <asm/atomic.h>
24 #include <linux/delay.h>
25 #include <linux/input.h>
26 #include <linux/workqueue.h>
27 #include <linux/freezer.h>
28 #include <linux/of_gpio.h>
29 #ifdef CONFIG_HAS_EARLYSUSPEND
30 #include <linux/earlysuspend.h>
31 #endif
32 #include <linux/sensor-dev.h>
33
34 #define KXTIK_DEVID_1004 0x05 //chip id
35 #define KXTIK_DEVID_J9_1005 0x07 //chip id
36 #define KXTIK_DEVID_J2_1009 0x09 //chip id
37 #define KXTIK_DEVID_1013 0x11 //chip id
38 #define KXTIK_RANGE 2000000
39
40 #define KXTIK_XOUT_HPF_L (0x00) /* 0000 0000 */
41 #define KXTIK_XOUT_HPF_H (0x01) /* 0000 0001 */
42 #define KXTIK_YOUT_HPF_L (0x02) /* 0000 0010 */
43 #define KXTIK_YOUT_HPF_H (0x03) /* 0000 0011 */
44 #define KXTIK_ZOUT_HPF_L (0x04) /* 0001 0100 */
45 #define KXTIK_ZOUT_HPF_H (0x05) /* 0001 0101 */
46 #define KXTIK_XOUT_L (0x06) /* 0000 0110 */
47 #define KXTIK_XOUT_H (0x07) /* 0000 0111 */
48 #define KXTIK_YOUT_L (0x08) /* 0000 1000 */
49 #define KXTIK_YOUT_H (0x09) /* 0000 1001 */
50 #define KXTIK_ZOUT_L (0x0A) /* 0001 1010 */
51 #define KXTIK_ZOUT_H (0x0B) /* 0001 1011 */
52 #define KXTIK_ST_RESP (0x0C) /* 0000 1100 */
53 #define KXTIK_WHO_AM_I (0x0F) /* 0000 1111 */
54 #define KXTIK_TILT_POS_CUR (0x10) /* 0001 0000 */
55 #define KXTIK_TILT_POS_PRE (0x11) /* 0001 0001 */
56 #define KXTIK_INT_SRC_REG1 (0x15) /* 0001 0101 */
57 #define KXTIK_INT_SRC_REG2 (0x16) /* 0001 0110 */
58 #define KXTIK_STATUS_REG (0x18) /* 0001 1000 */
59 #define KXTIK_INT_REL (0x1A) /* 0001 1010 */
60 #define KXTIK_CTRL_REG1 (0x1B) /* 0001 1011 */
61 #define KXTIK_CTRL_REG2 (0x1C) /* 0001 1100 */
62 #define KXTIK_CTRL_REG3 (0x1D) /* 0001 1101 */
63 #define KXTIK_INT_CTRL_REG1 (0x1E) /* 0001 1110 */
64 #define KXTIK_INT_CTRL_REG2 (0x1F) /* 0001 1111 */
65 #define KXTIK_INT_CTRL_REG3 (0x20) /* 0010 0000 */
66 #define KXTIK_DATA_CTRL_REG (0x21) /* 0010 0001 */
67 #define KXTIK_TILT_TIMER (0x28) /* 0010 1000 */
68 #define KXTIK_WUF_TIMER (0x29) /* 0010 1001 */
69 #define KXTIK_TDT_TIMER (0x2B) /* 0010 1011 */
70 #define KXTIK_TDT_H_THRESH (0x2C) /* 0010 1100 */
71 #define KXTIK_TDT_L_THRESH (0x2D) /* 0010 1101 */
72 #define KXTIK_TDT_TAP_TIMER (0x2E) /* 0010 1110 */
73 #define KXTIK_TDT_TOTAL_TIMER (0x2F) /* 0010 1111 */
74 #define KXTIK_TDT_LATENCY_TIMER (0x30) /* 0011 0000 */
75 #define KXTIK_TDT_WINDOW_TIMER (0x31) /* 0011 0001 */
76 #define KXTIK_WUF_THRESH (0x5A) /* 0101 1010 */
77 #define KXTIK_TILT_ANGLE (0x5C) /* 0101 1100 */
78 #define KXTIK_HYST_SET (0x5F) /* 0101 1111 */
79
80 /* CONTROL REGISTER 1 BITS */
81 #define KXTIK_DISABLE 0x7F
82 #define KXTIK_ENABLE (1 << 7)
83 #define KXTIK_DRDYE (1 << 5)
84 /* INPUT_ABS CONSTANTS */
85 #define FUZZ 3
86 #define FLAT 3
87 /* RESUME STATE INDICES */
88 #define RES_DATA_CTRL 0
89 #define RES_CTRL_REG1 1
90 #define RES_INT_CTRL1 2
91 #define RESUME_ENTRIES 3
92
93 /* CTRL_REG1: set resolution, g-range, data ready enable */
94 /* Output resolution: 8-bit valid or 12-bit valid */
95 #define KXTIK_RES_8BIT 0
96 #define KXTIK_RES_12BIT (1 << 6)
97 /* Output g-range: +/-2g, 4g, or 8g */
98 #define KXTIK_G_2G 0
99 #define KXTIK_G_4G (1 << 3)
100 #define KXTIK_G_8G (1 << 4)
101
102 /* DATA_CTRL_REG: controls the output data rate of the part */
103 #define KXTIK_ODR12_5F 0
104 #define KXTIK_ODR25F 1
105 #define KXTIK_ODR50F 2
106 #define KXTIK_ODR100F 3
107 #define KXTIK_ODR200F 4
108 #define KXTIK_ODR400F 5
109 #define KXTIK_ODR800F 6
110
111 /* kxtik */
112 #define KXTIK_PRECISION 12
113 #define KXTIK_BOUNDARY (0x1 << (KXTIK_PRECISION - 1))
114 #define KXTIK_GRAVITY_STEP KXTIK_RANGE / KXTIK_BOUNDARY
115
116
117 /****************operate according to sensor chip:start************/
118
sensor_active(struct i2c_client * client,int enable,int rate)119 static int sensor_active(struct i2c_client *client, int enable, int rate)
120 {
121 struct sensor_private_data *sensor =
122 (struct sensor_private_data *) i2c_get_clientdata(client);
123 int result = 0;
124 int status = 0;
125
126 sensor->ops->ctrl_data = sensor_read_reg(client, sensor->ops->ctrl_reg);
127
128 //register setting according to chip datasheet
129 if(enable)
130 {
131 status = KXTIK_ENABLE; //kxtik
132 sensor->ops->ctrl_data |= status;
133 }
134 else
135 {
136 status = ~KXTIK_ENABLE; //kxtik
137 sensor->ops->ctrl_data &= status;
138 }
139
140 DBG("%s:reg=0x%x,reg_ctrl=0x%x,enable=%d\n",__func__,sensor->ops->ctrl_reg, sensor->ops->ctrl_data, enable);
141 result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
142 if(result)
143 printk("%s:fail to active sensor\n",__func__);
144
145 return result;
146
147 }
148
sensor_init(struct i2c_client * client)149 static int sensor_init(struct i2c_client *client)
150 {
151 struct sensor_private_data *sensor =
152 (struct sensor_private_data *) i2c_get_clientdata(client);
153 int result = 0;
154 int i = 0;
155 unsigned char id_reg = KXTIK_WHO_AM_I;
156 unsigned char id_data = 0;
157 unsigned char ctrl_data_save = 0;
158
159 result = sensor->ops->active(client,0,0);
160 if(result)
161 {
162 printk("%s:line=%d,error\n",__func__,__LINE__);
163 return result;
164 }
165
166 sensor->status_cur = SENSOR_OFF;
167
168 for(i=0; i<3; i++)
169 {
170 result = sensor_rx_data(client, &id_reg, 1);
171 id_data = id_reg;
172 if(!result)
173 break;
174 }
175
176 if(result)
177 {
178 printk("%s:fail to read id,result=%d\n",__func__, result);
179 return result;
180 }
181
182 sensor->devid = id_data;
183
184 result = sensor_write_reg(client, KXTIK_DATA_CTRL_REG, KXTIK_ODR400F);
185 if(result)
186 {
187 printk("%s:line=%d,error\n",__func__,__LINE__);
188 return result;
189 }
190
191 if(sensor->pdata->irq_enable) //open interrupt
192 {
193
194 /*
195 BIT 4 IEA sets the polarity of the physical interrupt pin (7)
196 IEA = 0 ? polarity of the physical interrupt pin (7) is active low
197 IEA = 1 ? polarity of the physical interrupt pin (7) is active high
198 BIT 3 IEL sets the response of the physical interrupt pin (7)
199 IEL = 0 ? the physical interrupt pin (7) latches until it is cleared by reading INT_REL
200 IEL = 1 ? the physical interrupt pin (7) will transmit one pulse with a period of 0.03 - 0.05ms
201 */
202 if (id_data == KXTIK_DEVID_1004)
203 result = sensor_write_reg(client, KXTIK_INT_CTRL_REG1, 0x34);//enable int,active high,need read INT_REL
204 else
205 result = sensor_write_reg(client, KXTIK_INT_CTRL_REG1, 0x28);//enable int,active high,need read INT_REL
206
207 if(result)
208 {
209 printk("%s:line=%d,error\n",__func__,__LINE__);
210 return result;
211 }
212 }
213
214 ctrl_data_save = sensor_read_reg(client, sensor->ops->ctrl_reg);
215 DBG("%s: ctrl_data_save = 0x%x\n", __func__, ctrl_data_save);
216 sensor->ops->ctrl_data = (KXTIK_RES_12BIT | KXTIK_G_2G);
217 if(sensor->pdata->irq_enable)
218 {
219 sensor->ops->ctrl_data &= ~KXTIK_ENABLE;
220 sensor->ops->ctrl_data |= KXTIK_DRDYE;
221 }
222 DBG("%s: first write sensor->ops->ctrl_data = 0x%x\n", __func__, sensor->ops->ctrl_data);
223 result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
224 if(result)
225 {
226 printk("%s:line=%d,error\n",__func__,__LINE__);
227 return result;
228 }
229 if(ctrl_data_save & 0x80)
230 sensor->ops->ctrl_data |= KXTIK_ENABLE;
231 else
232 sensor->ops->ctrl_data &= ~KXTIK_ENABLE;
233 DBG("%s: second write sensor->ops->ctrl_data = 0x%x\n", __func__, sensor->ops->ctrl_data);
234 result = sensor_write_reg(client, sensor->ops->ctrl_reg, sensor->ops->ctrl_data);
235 if(result)
236 {
237 printk("%s:line=%d,error\n",__func__,__LINE__);
238 return result;
239 }
240
241 DBG("%s:%s id=0x%x\n",__func__,sensor->ops->name, id_data);
242 return result;
243 }
244
sensor_convert_data(struct i2c_client * client,char high_byte,char low_byte)245 static int sensor_convert_data(struct i2c_client *client, char high_byte, char low_byte)
246 {
247 s64 result;
248 struct sensor_private_data *sensor =
249 (struct sensor_private_data *) i2c_get_clientdata(client);
250 /* int precision = sensor->ops->precision; */
251 switch (sensor->devid) {
252 case KXTIK_DEVID_1004:
253 case KXTIK_DEVID_1013:
254 case KXTIK_DEVID_J9_1005:
255 case KXTIK_DEVID_J2_1009:
256 result = (((int)high_byte << 8) | ((int)low_byte ))>>4;
257 if (result < KXTIK_BOUNDARY)
258 result = result * KXTIK_GRAVITY_STEP;
259 else
260 result = ~(((~result & (0x7fff >> (16 - KXTIK_PRECISION))) + 1)
261 * KXTIK_GRAVITY_STEP) + 1;
262 break;
263
264 default:
265 printk(KERN_ERR "%s: devid wasn't set correctly\n",__func__);
266 return -EFAULT;
267 }
268 return (int)result;
269 }
270
angle_report_value(struct i2c_client * client,struct sensor_axis * axis)271 static int angle_report_value(struct i2c_client *client, struct sensor_axis *axis)
272 {
273 struct sensor_private_data *sensor =
274 (struct sensor_private_data *) i2c_get_clientdata(client);
275
276 /* Report acceleration sensor information */
277 input_report_abs(sensor->input_dev, ABS_X, axis->x);
278 input_report_abs(sensor->input_dev, ABS_Y, axis->y);
279 input_report_abs(sensor->input_dev, ABS_Z, axis->z);
280 input_sync(sensor->input_dev);
281 DBG("Gsensor x==%d y==%d z==%d\n",axis->x,axis->y,axis->z);
282
283 return 0;
284 }
285
286 #define GSENSOR_MIN 10
sensor_report_value(struct i2c_client * client)287 static int sensor_report_value(struct i2c_client *client)
288 {
289 struct sensor_private_data *sensor =
290 (struct sensor_private_data *) i2c_get_clientdata(client);
291 struct sensor_platform_data *pdata = sensor->pdata;
292 int ret = 0;
293 int x,y,z;
294 struct sensor_axis axis;
295 char buffer[6] = {0};
296 char value = 0;
297
298 if(sensor->ops->read_len < 6) //sensor->ops->read_len = 6
299 {
300 printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
301 return -1;
302 }
303
304 memset(buffer, 0, 6);
305
306 /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
307 do {
308 *buffer = sensor->ops->read_reg;
309 ret = sensor_rx_data(client, buffer, sensor->ops->read_len);
310 if (ret < 0)
311 return ret;
312 } while (0);
313
314 //this angle need 6 bytes buffer
315 x = sensor_convert_data(sensor->client, buffer[1], buffer[0]); //buffer[1]:high bit
316 y = sensor_convert_data(sensor->client, buffer[3], buffer[2]);
317 z = sensor_convert_data(sensor->client, buffer[5], buffer[4]);
318
319 axis.x = (pdata->orientation[0])*x + (pdata->orientation[1])*y + (pdata->orientation[2])*z;
320 axis.y = (pdata->orientation[3])*x + (pdata->orientation[4])*y + (pdata->orientation[5])*z;
321 axis.z = (pdata->orientation[6])*x + (pdata->orientation[7])*y + (pdata->orientation[8])*z;
322
323 DBG( "%s: axis = %d %d %d \n", __func__, axis.x, axis.y, axis.z);
324
325 //Report event only while value is changed to save some power
326 if((abs(sensor->axis.x - axis.x) > GSENSOR_MIN) || (abs(sensor->axis.y - axis.y) > GSENSOR_MIN) || (abs(sensor->axis.z - axis.z) > GSENSOR_MIN))
327 {
328 angle_report_value(client, &axis);
329
330 /* ?????ػ???????. */
331 mutex_lock(&(sensor->data_mutex) );
332 sensor->axis = axis;
333 mutex_unlock(&(sensor->data_mutex) );
334 }
335
336 if((sensor->pdata->irq_enable)&& (sensor->ops->int_status_reg >= 0)) //read sensor intterupt status register
337 {
338
339 value = sensor_read_reg(client, sensor->ops->int_status_reg);
340 DBG("%s:sensor int status :0x%x\n",__func__,value);
341 }
342
343 return ret;
344 }
345
346 static struct sensor_operate angle_kxtik_ops = {
347 .name = "angle_kxtik",
348 .type = SENSOR_TYPE_ANGLE, //sensor type and it should be correct
349 .id_i2c = ANGLE_ID_KXTIK, //i2c id number
350 .read_reg = KXTIK_XOUT_L, //read data
351 .read_len = 6, //data length
352 .id_reg = SENSOR_UNKNOW_DATA, //read device id from this register
353 .id_data = SENSOR_UNKNOW_DATA,
354 .precision = KXTIK_PRECISION, //12 bits
355 .ctrl_reg = KXTIK_CTRL_REG1, //enable or disable
356 .int_status_reg = KXTIK_INT_REL, //intterupt status register
357 .range = {-KXTIK_RANGE,KXTIK_RANGE}, //range
358 .trig = IRQF_TRIGGER_LOW|IRQF_ONESHOT,
359 .active = sensor_active,
360 .init = sensor_init,
361 .report = sensor_report_value,
362 };
363
364 /****************operate according to sensor chip:end************/
angle_kxtik_probe(struct i2c_client * client,const struct i2c_device_id * devid)365 static int angle_kxtik_probe(struct i2c_client *client,
366 const struct i2c_device_id *devid)
367 {
368 return sensor_register_device(client, NULL, devid, &angle_kxtik_ops);
369 }
370
angle_kxtik_remove(struct i2c_client * client)371 static int angle_kxtik_remove(struct i2c_client *client)
372 {
373 return sensor_unregister_device(client, NULL, &angle_kxtik_ops);
374 }
375
376 static const struct i2c_device_id angle_kxtik_id[] = {
377 {"angle_kxtik", ANGLE_ID_KXTIK},
378 {}
379 };
380
381 static struct i2c_driver angle_kxtik_driver = {
382 .probe = angle_kxtik_probe,
383 .remove = angle_kxtik_remove,
384 .shutdown = sensor_shutdown,
385 .id_table = angle_kxtik_id,
386 .driver = {
387 .name = "angle_kxtik",
388 #ifdef CONFIG_PM
389 .pm = &sensor_pm_ops,
390 #endif
391 },
392 };
393
394 module_i2c_driver(angle_kxtik_driver);
395
396 MODULE_AUTHOR("luowei <lw@rock-chips.com>");
397 MODULE_DESCRIPTION("kxtik angle driver");
398 MODULE_LICENSE("GPL");
399