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10#include <linux/i2c.h>
11#include <linux/input.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/regulator/consumer.h>
18
19
20#define DRV2667_STATUS 0x00
21#define DRV2667_CTRL_1 0x01
22#define DRV2667_CTRL_2 0x02
23
24#define DRV2667_WV_SEQ_0 0x03
25#define DRV2667_WV_SEQ_1 0x04
26#define DRV2667_WV_SEQ_2 0x05
27#define DRV2667_WV_SEQ_3 0x06
28#define DRV2667_WV_SEQ_4 0x07
29#define DRV2667_WV_SEQ_5 0x08
30#define DRV2667_WV_SEQ_6 0x09
31#define DRV2667_WV_SEQ_7 0x0A
32#define DRV2667_FIFO 0x0B
33#define DRV2667_PAGE 0xFF
34#define DRV2667_MAX_REG DRV2667_PAGE
35
36#define DRV2667_PAGE_0 0x00
37#define DRV2667_PAGE_1 0x01
38#define DRV2667_PAGE_2 0x02
39#define DRV2667_PAGE_3 0x03
40#define DRV2667_PAGE_4 0x04
41#define DRV2667_PAGE_5 0x05
42#define DRV2667_PAGE_6 0x06
43#define DRV2667_PAGE_7 0x07
44#define DRV2667_PAGE_8 0x08
45
46
47#define DRV2667_RAM_HDR_SZ 0x0
48
49#define DRV2667_RAM_START_HI 0x01
50#define DRV2667_RAM_START_LO 0x02
51#define DRV2667_RAM_STOP_HI 0x03
52#define DRV2667_RAM_STOP_LO 0x04
53#define DRV2667_RAM_REPEAT_CT 0x05
54
55#define DRV2667_RAM_AMP 0x06
56#define DRV2667_RAM_FREQ 0x07
57#define DRV2667_RAM_DURATION 0x08
58#define DRV2667_RAM_ENVELOPE 0x09
59
60
61#define DRV2667_25_VPP_GAIN 0x00
62#define DRV2667_50_VPP_GAIN 0x01
63#define DRV2667_75_VPP_GAIN 0x02
64#define DRV2667_100_VPP_GAIN 0x03
65#define DRV2667_DIGITAL_IN 0xfc
66#define DRV2667_ANALOG_IN (1 << 2)
67
68
69#define DRV2667_GO (1 << 0)
70#define DRV2667_STANDBY (1 << 6)
71#define DRV2667_DEV_RST (1 << 7)
72
73
74#define DRV2667_NO_ENV 0x00
75#define DRV2667_32_MS_ENV 0x01
76#define DRV2667_64_MS_ENV 0x02
77#define DRV2667_96_MS_ENV 0x03
78#define DRV2667_128_MS_ENV 0x04
79#define DRV2667_160_MS_ENV 0x05
80#define DRV2667_192_MS_ENV 0x06
81#define DRV2667_224_MS_ENV 0x07
82#define DRV2667_256_MS_ENV 0x08
83#define DRV2667_512_MS_ENV 0x09
84#define DRV2667_768_MS_ENV 0x0a
85#define DRV2667_1024_MS_ENV 0x0b
86#define DRV2667_1280_MS_ENV 0x0c
87#define DRV2667_1536_MS_ENV 0x0d
88#define DRV2667_1792_MS_ENV 0x0e
89#define DRV2667_2048_MS_ENV 0x0f
90
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99
100struct drv2667_data {
101 struct input_dev *input_dev;
102 struct i2c_client *client;
103 struct regmap *regmap;
104 struct work_struct work;
105 struct regulator *regulator;
106 u32 page;
107 u32 magnitude;
108 u32 frequency;
109};
110
111static const struct reg_default drv2667_reg_defs[] = {
112 { DRV2667_STATUS, 0x02 },
113 { DRV2667_CTRL_1, 0x28 },
114 { DRV2667_CTRL_2, 0x40 },
115 { DRV2667_WV_SEQ_0, 0x00 },
116 { DRV2667_WV_SEQ_1, 0x00 },
117 { DRV2667_WV_SEQ_2, 0x00 },
118 { DRV2667_WV_SEQ_3, 0x00 },
119 { DRV2667_WV_SEQ_4, 0x00 },
120 { DRV2667_WV_SEQ_5, 0x00 },
121 { DRV2667_WV_SEQ_6, 0x00 },
122 { DRV2667_WV_SEQ_7, 0x00 },
123 { DRV2667_FIFO, 0x00 },
124 { DRV2667_PAGE, 0x00 },
125};
126
127static int drv2667_set_waveform_freq(struct drv2667_data *haptics)
128{
129 unsigned int read_buf;
130 int freq;
131 int error;
132
133
134
135
136 freq = (haptics->frequency * 1000) / 78125;
137 if (freq <= 0) {
138 dev_err(&haptics->client->dev,
139 "ERROR: Frequency calculated to %i\n", freq);
140 return -EINVAL;
141 }
142
143 error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf);
144 if (error) {
145 dev_err(&haptics->client->dev,
146 "Failed to read the page number: %d\n", error);
147 return -EIO;
148 }
149
150 if (read_buf == DRV2667_PAGE_0 ||
151 haptics->page != read_buf) {
152 error = regmap_write(haptics->regmap,
153 DRV2667_PAGE, haptics->page);
154 if (error) {
155 dev_err(&haptics->client->dev,
156 "Failed to set the page: %d\n", error);
157 return -EIO;
158 }
159 }
160
161 error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ, freq);
162 if (error)
163 dev_err(&haptics->client->dev,
164 "Failed to set the frequency: %d\n", error);
165
166
167 if (read_buf == DRV2667_PAGE_0 ||
168 haptics->page != read_buf) {
169 error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf);
170 if (error) {
171 dev_err(&haptics->client->dev,
172 "Failed to set the page: %d\n", error);
173 return -EIO;
174 }
175 }
176
177 return error;
178}
179
180static void drv2667_worker(struct work_struct *work)
181{
182 struct drv2667_data *haptics = container_of(work, struct drv2667_data, work);
183 int error;
184
185 if (haptics->magnitude) {
186 error = regmap_write(haptics->regmap,
187 DRV2667_PAGE, haptics->page);
188 if (error) {
189 dev_err(&haptics->client->dev,
190 "Failed to set the page: %d\n", error);
191 return;
192 }
193
194 error = regmap_write(haptics->regmap, DRV2667_RAM_AMP,
195 haptics->magnitude);
196 if (error) {
197 dev_err(&haptics->client->dev,
198 "Failed to set the amplitude: %d\n", error);
199 return;
200 }
201
202 error = regmap_write(haptics->regmap,
203 DRV2667_PAGE, DRV2667_PAGE_0);
204 if (error) {
205 dev_err(&haptics->client->dev,
206 "Failed to set the page: %d\n", error);
207 return;
208 }
209
210 error = regmap_write(haptics->regmap,
211 DRV2667_CTRL_2, DRV2667_GO);
212 if (error) {
213 dev_err(&haptics->client->dev,
214 "Failed to set the GO bit: %d\n", error);
215 }
216 } else {
217 error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
218 DRV2667_GO, 0);
219 if (error) {
220 dev_err(&haptics->client->dev,
221 "Failed to unset the GO bit: %d\n", error);
222 }
223 }
224}
225
226static int drv2667_haptics_play(struct input_dev *input, void *data,
227 struct ff_effect *effect)
228{
229 struct drv2667_data *haptics = input_get_drvdata(input);
230
231 if (effect->u.rumble.strong_magnitude > 0)
232 haptics->magnitude = effect->u.rumble.strong_magnitude;
233 else if (effect->u.rumble.weak_magnitude > 0)
234 haptics->magnitude = effect->u.rumble.weak_magnitude;
235 else
236 haptics->magnitude = 0;
237
238 schedule_work(&haptics->work);
239
240 return 0;
241}
242
243static void drv2667_close(struct input_dev *input)
244{
245 struct drv2667_data *haptics = input_get_drvdata(input);
246 int error;
247
248 cancel_work_sync(&haptics->work);
249
250 error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
251 DRV2667_STANDBY, DRV2667_STANDBY);
252 if (error)
253 dev_err(&haptics->client->dev,
254 "Failed to enter standby mode: %d\n", error);
255}
256
257static const struct reg_sequence drv2667_init_regs[] = {
258 { DRV2667_CTRL_2, 0 },
259 { DRV2667_CTRL_1, DRV2667_25_VPP_GAIN },
260 { DRV2667_WV_SEQ_0, 1 },
261 { DRV2667_WV_SEQ_1, 0 }
262};
263
264static const struct reg_sequence drv2667_page1_init[] = {
265 { DRV2667_RAM_HDR_SZ, 0x05 },
266 { DRV2667_RAM_START_HI, 0x80 },
267 { DRV2667_RAM_START_LO, 0x06 },
268 { DRV2667_RAM_STOP_HI, 0x00 },
269 { DRV2667_RAM_STOP_LO, 0x09 },
270 { DRV2667_RAM_REPEAT_CT, 0 },
271 { DRV2667_RAM_DURATION, 0x05 },
272 { DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV },
273 { DRV2667_RAM_AMP, 0x60 },
274};
275
276static int drv2667_init(struct drv2667_data *haptics)
277{
278 int error;
279
280
281 haptics->frequency = 195;
282 haptics->page = DRV2667_PAGE_1;
283
284 error = regmap_register_patch(haptics->regmap,
285 drv2667_init_regs,
286 ARRAY_SIZE(drv2667_init_regs));
287 if (error) {
288 dev_err(&haptics->client->dev,
289 "Failed to write init registers: %d\n",
290 error);
291 return error;
292 }
293
294 error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page);
295 if (error) {
296 dev_err(&haptics->client->dev, "Failed to set page: %d\n",
297 error);
298 goto error_out;
299 }
300
301 error = drv2667_set_waveform_freq(haptics);
302 if (error)
303 goto error_page;
304
305 error = regmap_register_patch(haptics->regmap,
306 drv2667_page1_init,
307 ARRAY_SIZE(drv2667_page1_init));
308 if (error) {
309 dev_err(&haptics->client->dev,
310 "Failed to write page registers: %d\n",
311 error);
312 return error;
313 }
314
315 error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
316 return error;
317
318error_page:
319 regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0);
320error_out:
321 return error;
322}
323
324static const struct regmap_config drv2667_regmap_config = {
325 .reg_bits = 8,
326 .val_bits = 8,
327
328 .max_register = DRV2667_MAX_REG,
329 .reg_defaults = drv2667_reg_defs,
330 .num_reg_defaults = ARRAY_SIZE(drv2667_reg_defs),
331 .cache_type = REGCACHE_NONE,
332};
333
334static int drv2667_probe(struct i2c_client *client,
335 const struct i2c_device_id *id)
336{
337 struct drv2667_data *haptics;
338 int error;
339
340 haptics = devm_kzalloc(&client->dev, sizeof(*haptics), GFP_KERNEL);
341 if (!haptics)
342 return -ENOMEM;
343
344 haptics->regulator = devm_regulator_get(&client->dev, "vbat");
345 if (IS_ERR(haptics->regulator)) {
346 error = PTR_ERR(haptics->regulator);
347 dev_err(&client->dev,
348 "unable to get regulator, error: %d\n", error);
349 return error;
350 }
351
352 haptics->input_dev = devm_input_allocate_device(&client->dev);
353 if (!haptics->input_dev) {
354 dev_err(&client->dev, "Failed to allocate input device\n");
355 return -ENOMEM;
356 }
357
358 haptics->input_dev->name = "drv2667:haptics";
359 haptics->input_dev->dev.parent = client->dev.parent;
360 haptics->input_dev->close = drv2667_close;
361 input_set_drvdata(haptics->input_dev, haptics);
362 input_set_capability(haptics->input_dev, EV_FF, FF_RUMBLE);
363
364 error = input_ff_create_memless(haptics->input_dev, NULL,
365 drv2667_haptics_play);
366 if (error) {
367 dev_err(&client->dev, "input_ff_create() failed: %d\n",
368 error);
369 return error;
370 }
371
372 INIT_WORK(&haptics->work, drv2667_worker);
373
374 haptics->client = client;
375 i2c_set_clientdata(client, haptics);
376
377 haptics->regmap = devm_regmap_init_i2c(client, &drv2667_regmap_config);
378 if (IS_ERR(haptics->regmap)) {
379 error = PTR_ERR(haptics->regmap);
380 dev_err(&client->dev, "Failed to allocate register map: %d\n",
381 error);
382 return error;
383 }
384
385 error = drv2667_init(haptics);
386 if (error) {
387 dev_err(&client->dev, "Device init failed: %d\n", error);
388 return error;
389 }
390
391 error = input_register_device(haptics->input_dev);
392 if (error) {
393 dev_err(&client->dev, "couldn't register input device: %d\n",
394 error);
395 return error;
396 }
397
398 return 0;
399}
400
401static int __maybe_unused drv2667_suspend(struct device *dev)
402{
403 struct drv2667_data *haptics = dev_get_drvdata(dev);
404 int ret = 0;
405
406 mutex_lock(&haptics->input_dev->mutex);
407
408 if (haptics->input_dev->users) {
409 ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
410 DRV2667_STANDBY, DRV2667_STANDBY);
411 if (ret) {
412 dev_err(dev, "Failed to set standby mode\n");
413 regulator_disable(haptics->regulator);
414 goto out;
415 }
416
417 ret = regulator_disable(haptics->regulator);
418 if (ret) {
419 dev_err(dev, "Failed to disable regulator\n");
420 regmap_update_bits(haptics->regmap,
421 DRV2667_CTRL_2,
422 DRV2667_STANDBY, 0);
423 }
424 }
425out:
426 mutex_unlock(&haptics->input_dev->mutex);
427 return ret;
428}
429
430static int __maybe_unused drv2667_resume(struct device *dev)
431{
432 struct drv2667_data *haptics = dev_get_drvdata(dev);
433 int ret = 0;
434
435 mutex_lock(&haptics->input_dev->mutex);
436
437 if (haptics->input_dev->users) {
438 ret = regulator_enable(haptics->regulator);
439 if (ret) {
440 dev_err(dev, "Failed to enable regulator\n");
441 goto out;
442 }
443
444 ret = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2,
445 DRV2667_STANDBY, 0);
446 if (ret) {
447 dev_err(dev, "Failed to unset standby mode\n");
448 regulator_disable(haptics->regulator);
449 goto out;
450 }
451
452 }
453
454out:
455 mutex_unlock(&haptics->input_dev->mutex);
456 return ret;
457}
458
459static SIMPLE_DEV_PM_OPS(drv2667_pm_ops, drv2667_suspend, drv2667_resume);
460
461static const struct i2c_device_id drv2667_id[] = {
462 { "drv2667", 0 },
463 { }
464};
465MODULE_DEVICE_TABLE(i2c, drv2667_id);
466
467#ifdef CONFIG_OF
468static const struct of_device_id drv2667_of_match[] = {
469 { .compatible = "ti,drv2667", },
470 { }
471};
472MODULE_DEVICE_TABLE(of, drv2667_of_match);
473#endif
474
475static struct i2c_driver drv2667_driver = {
476 .probe = drv2667_probe,
477 .driver = {
478 .name = "drv2667-haptics",
479 .of_match_table = of_match_ptr(drv2667_of_match),
480 .pm = &drv2667_pm_ops,
481 },
482 .id_table = drv2667_id,
483};
484module_i2c_driver(drv2667_driver);
485
486MODULE_DESCRIPTION("TI DRV2667 haptics driver");
487MODULE_LICENSE("GPL");
488MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
489
