1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * VTI CMA3000_D0x Accelerometer driver
4 *
5 * Copyright (C) 2010 Texas Instruments
6 * Author: Hemanth V <hemanthv@ti.com>
7 */
8
9 #include <linux/types.h>
10 #include <linux/interrupt.h>
11 #include <linux/delay.h>
12 #include <linux/slab.h>
13 #include <linux/input.h>
14 #include <linux/input/cma3000.h>
15 #include <linux/module.h>
16
17 #include "cma3000_d0x.h"
18
19 #define CMA3000_WHOAMI 0x00
20 #define CMA3000_REVID 0x01
21 #define CMA3000_CTRL 0x02
22 #define CMA3000_STATUS 0x03
23 #define CMA3000_RSTR 0x04
24 #define CMA3000_INTSTATUS 0x05
25 #define CMA3000_DOUTX 0x06
26 #define CMA3000_DOUTY 0x07
27 #define CMA3000_DOUTZ 0x08
28 #define CMA3000_MDTHR 0x09
29 #define CMA3000_MDFFTMR 0x0A
30 #define CMA3000_FFTHR 0x0B
31
32 #define CMA3000_RANGE2G (1 << 7)
33 #define CMA3000_RANGE8G (0 << 7)
34 #define CMA3000_BUSI2C (0 << 4)
35 #define CMA3000_MODEMASK (7 << 1)
36 #define CMA3000_GRANGEMASK (1 << 7)
37
38 #define CMA3000_STATUS_PERR 1
39 #define CMA3000_INTSTATUS_FFDET (1 << 2)
40
41 /* Settling time delay in ms */
42 #define CMA3000_SETDELAY 30
43
44 /* Delay for clearing interrupt in us */
45 #define CMA3000_INTDELAY 44
46
47
48 /*
49 * Bit weights in mg for bit 0, other bits need
50 * multiply factor 2^n. Eight bit is the sign bit.
51 */
52 #define BIT_TO_2G 18
53 #define BIT_TO_8G 71
54
55 struct cma3000_accl_data {
56 const struct cma3000_bus_ops *bus_ops;
57 const struct cma3000_platform_data *pdata;
58
59 struct device *dev;
60 struct input_dev *input_dev;
61
62 int bit_to_mg;
63 int irq;
64
65 int g_range;
66 u8 mode;
67
68 struct mutex mutex;
69 bool opened;
70 bool suspended;
71 };
72
73 #define CMA3000_READ(data, reg, msg) \
74 (data->bus_ops->read(data->dev, reg, msg))
75 #define CMA3000_SET(data, reg, val, msg) \
76 ((data)->bus_ops->write(data->dev, reg, val, msg))
77
78 /*
79 * Conversion for each of the eight modes to g, depending
80 * on G range i.e 2G or 8G. Some modes always operate in
81 * 8G.
82 */
83
84 static int mode_to_mg[8][2] = {
85 { 0, 0 },
86 { BIT_TO_8G, BIT_TO_2G },
87 { BIT_TO_8G, BIT_TO_2G },
88 { BIT_TO_8G, BIT_TO_8G },
89 { BIT_TO_8G, BIT_TO_8G },
90 { BIT_TO_8G, BIT_TO_2G },
91 { BIT_TO_8G, BIT_TO_2G },
92 { 0, 0},
93 };
94
decode_mg(struct cma3000_accl_data * data,int * datax,int * datay,int * dataz)95 static void decode_mg(struct cma3000_accl_data *data, int *datax,
96 int *datay, int *dataz)
97 {
98 /* Data in 2's complement, convert to mg */
99 *datax = ((s8)*datax) * data->bit_to_mg;
100 *datay = ((s8)*datay) * data->bit_to_mg;
101 *dataz = ((s8)*dataz) * data->bit_to_mg;
102 }
103
cma3000_thread_irq(int irq,void * dev_id)104 static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
105 {
106 struct cma3000_accl_data *data = dev_id;
107 int datax, datay, dataz, intr_status;
108 u8 ctrl, mode, range;
109
110 intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
111 if (intr_status < 0)
112 return IRQ_NONE;
113
114 /* Check if free fall is detected, report immediately */
115 if (intr_status & CMA3000_INTSTATUS_FFDET) {
116 input_report_abs(data->input_dev, ABS_MISC, 1);
117 input_sync(data->input_dev);
118 } else {
119 input_report_abs(data->input_dev, ABS_MISC, 0);
120 }
121
122 datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
123 datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
124 dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");
125
126 ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
127 mode = (ctrl & CMA3000_MODEMASK) >> 1;
128 range = (ctrl & CMA3000_GRANGEMASK) >> 7;
129
130 data->bit_to_mg = mode_to_mg[mode][range];
131
132 /* Interrupt not for this device */
133 if (data->bit_to_mg == 0)
134 return IRQ_NONE;
135
136 /* Decode register values to milli g */
137 decode_mg(data, &datax, &datay, &dataz);
138
139 input_report_abs(data->input_dev, ABS_X, datax);
140 input_report_abs(data->input_dev, ABS_Y, datay);
141 input_report_abs(data->input_dev, ABS_Z, dataz);
142 input_sync(data->input_dev);
143
144 return IRQ_HANDLED;
145 }
146
cma3000_reset(struct cma3000_accl_data * data)147 static int cma3000_reset(struct cma3000_accl_data *data)
148 {
149 int val;
150
151 /* Reset sequence */
152 CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
153 CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
154 CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");
155
156 /* Settling time delay */
157 mdelay(10);
158
159 val = CMA3000_READ(data, CMA3000_STATUS, "Status");
160 if (val < 0) {
161 dev_err(data->dev, "Reset failed\n");
162 return val;
163 }
164
165 if (val & CMA3000_STATUS_PERR) {
166 dev_err(data->dev, "Parity Error\n");
167 return -EIO;
168 }
169
170 return 0;
171 }
172
cma3000_poweron(struct cma3000_accl_data * data)173 static int cma3000_poweron(struct cma3000_accl_data *data)
174 {
175 const struct cma3000_platform_data *pdata = data->pdata;
176 u8 ctrl = 0;
177 int ret;
178
179 if (data->g_range == CMARANGE_2G) {
180 ctrl = (data->mode << 1) | CMA3000_RANGE2G;
181 } else if (data->g_range == CMARANGE_8G) {
182 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
183 } else {
184 dev_info(data->dev,
185 "Invalid G range specified, assuming 8G\n");
186 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
187 }
188
189 ctrl |= data->bus_ops->ctrl_mod;
190
191 CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
192 "Motion Detect Threshold");
193 CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
194 "Time register");
195 CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
196 "Free fall threshold");
197 ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
198 if (ret < 0)
199 return -EIO;
200
201 msleep(CMA3000_SETDELAY);
202
203 return 0;
204 }
205
cma3000_poweroff(struct cma3000_accl_data * data)206 static int cma3000_poweroff(struct cma3000_accl_data *data)
207 {
208 int ret;
209
210 ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
211 msleep(CMA3000_SETDELAY);
212
213 return ret;
214 }
215
cma3000_open(struct input_dev * input_dev)216 static int cma3000_open(struct input_dev *input_dev)
217 {
218 struct cma3000_accl_data *data = input_get_drvdata(input_dev);
219
220 mutex_lock(&data->mutex);
221
222 if (!data->suspended)
223 cma3000_poweron(data);
224
225 data->opened = true;
226
227 mutex_unlock(&data->mutex);
228
229 return 0;
230 }
231
cma3000_close(struct input_dev * input_dev)232 static void cma3000_close(struct input_dev *input_dev)
233 {
234 struct cma3000_accl_data *data = input_get_drvdata(input_dev);
235
236 mutex_lock(&data->mutex);
237
238 if (!data->suspended)
239 cma3000_poweroff(data);
240
241 data->opened = false;
242
243 mutex_unlock(&data->mutex);
244 }
245
cma3000_suspend(struct cma3000_accl_data * data)246 void cma3000_suspend(struct cma3000_accl_data *data)
247 {
248 mutex_lock(&data->mutex);
249
250 if (!data->suspended && data->opened)
251 cma3000_poweroff(data);
252
253 data->suspended = true;
254
255 mutex_unlock(&data->mutex);
256 }
257 EXPORT_SYMBOL(cma3000_suspend);
258
259
cma3000_resume(struct cma3000_accl_data * data)260 void cma3000_resume(struct cma3000_accl_data *data)
261 {
262 mutex_lock(&data->mutex);
263
264 if (data->suspended && data->opened)
265 cma3000_poweron(data);
266
267 data->suspended = false;
268
269 mutex_unlock(&data->mutex);
270 }
271 EXPORT_SYMBOL(cma3000_resume);
272
cma3000_init(struct device * dev,int irq,const struct cma3000_bus_ops * bops)273 struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
274 const struct cma3000_bus_ops *bops)
275 {
276 const struct cma3000_platform_data *pdata = dev_get_platdata(dev);
277 struct cma3000_accl_data *data;
278 struct input_dev *input_dev;
279 int rev;
280 int error;
281
282 if (!pdata) {
283 dev_err(dev, "platform data not found\n");
284 error = -EINVAL;
285 goto err_out;
286 }
287
288
289 /* if no IRQ return error */
290 if (irq == 0) {
291 error = -EINVAL;
292 goto err_out;
293 }
294
295 data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL);
296 input_dev = input_allocate_device();
297 if (!data || !input_dev) {
298 error = -ENOMEM;
299 goto err_free_mem;
300 }
301
302 data->dev = dev;
303 data->input_dev = input_dev;
304 data->bus_ops = bops;
305 data->pdata = pdata;
306 data->irq = irq;
307 mutex_init(&data->mutex);
308
309 data->mode = pdata->mode;
310 if (data->mode > CMAMODE_POFF) {
311 data->mode = CMAMODE_MOTDET;
312 dev_warn(dev,
313 "Invalid mode specified, assuming Motion Detect\n");
314 }
315
316 data->g_range = pdata->g_range;
317 if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
318 dev_info(dev,
319 "Invalid G range specified, assuming 8G\n");
320 data->g_range = CMARANGE_8G;
321 }
322
323 input_dev->name = "cma3000-accelerometer";
324 input_dev->id.bustype = bops->bustype;
325 input_dev->open = cma3000_open;
326 input_dev->close = cma3000_close;
327
328 __set_bit(EV_ABS, input_dev->evbit);
329
330 input_set_abs_params(input_dev, ABS_X,
331 -data->g_range, data->g_range, pdata->fuzz_x, 0);
332 input_set_abs_params(input_dev, ABS_Y,
333 -data->g_range, data->g_range, pdata->fuzz_y, 0);
334 input_set_abs_params(input_dev, ABS_Z,
335 -data->g_range, data->g_range, pdata->fuzz_z, 0);
336 input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0);
337
338 input_set_drvdata(input_dev, data);
339
340 error = cma3000_reset(data);
341 if (error)
342 goto err_free_mem;
343
344 rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
345 if (rev < 0) {
346 error = rev;
347 goto err_free_mem;
348 }
349
350 pr_info("CMA3000 Accelerometer: Revision %x\n", rev);
351
352 error = request_threaded_irq(irq, NULL, cma3000_thread_irq,
353 pdata->irqflags | IRQF_ONESHOT,
354 "cma3000_d0x", data);
355 if (error) {
356 dev_err(dev, "request_threaded_irq failed\n");
357 goto err_free_mem;
358 }
359
360 error = input_register_device(data->input_dev);
361 if (error) {
362 dev_err(dev, "Unable to register input device\n");
363 goto err_free_irq;
364 }
365
366 return data;
367
368 err_free_irq:
369 free_irq(irq, data);
370 err_free_mem:
371 input_free_device(input_dev);
372 kfree(data);
373 err_out:
374 return ERR_PTR(error);
375 }
376 EXPORT_SYMBOL(cma3000_init);
377
cma3000_exit(struct cma3000_accl_data * data)378 void cma3000_exit(struct cma3000_accl_data *data)
379 {
380 free_irq(data->irq, data);
381 input_unregister_device(data->input_dev);
382 kfree(data);
383 }
384 EXPORT_SYMBOL(cma3000_exit);
385
386 MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
387 MODULE_LICENSE("GPL");
388 MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");
389
