1 /*
2 * MAXIM MAX77693/MAX77843 Haptic device driver
3 *
4 * Copyright (C) 2014,2015 Samsung Electronics
5 * Jaewon Kim <jaewon02.kim@samsung.com>
6 * Krzysztof Kozlowski <krzk@kernel.org>
7 *
8 * This program is not provided / owned by Maxim Integrated Products.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 #include <linux/err.h>
17 #include <linux/init.h>
18 #include <linux/i2c.h>
19 #include <linux/regmap.h>
20 #include <linux/input.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/pwm.h>
24 #include <linux/slab.h>
25 #include <linux/workqueue.h>
26 #include <linux/regulator/consumer.h>
27 #include <linux/mfd/max77693.h>
28 #include <linux/mfd/max77693-common.h>
29 #include <linux/mfd/max77693-private.h>
30 #include <linux/mfd/max77843-private.h>
31
32 #define MAX_MAGNITUDE_SHIFT 16
33
34 enum max77693_haptic_motor_type {
35 MAX77693_HAPTIC_ERM = 0,
36 MAX77693_HAPTIC_LRA,
37 };
38
39 enum max77693_haptic_pulse_mode {
40 MAX77693_HAPTIC_EXTERNAL_MODE = 0,
41 MAX77693_HAPTIC_INTERNAL_MODE,
42 };
43
44 enum max77693_haptic_pwm_divisor {
45 MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
46 MAX77693_HAPTIC_PWM_DIVISOR_64,
47 MAX77693_HAPTIC_PWM_DIVISOR_128,
48 MAX77693_HAPTIC_PWM_DIVISOR_256,
49 };
50
51 struct max77693_haptic {
52 enum max77693_types dev_type;
53
54 struct regmap *regmap_pmic;
55 struct regmap *regmap_haptic;
56 struct device *dev;
57 struct input_dev *input_dev;
58 struct pwm_device *pwm_dev;
59 struct regulator *motor_reg;
60
61 bool enabled;
62 bool suspend_state;
63 unsigned int magnitude;
64 unsigned int pwm_duty;
65 enum max77693_haptic_motor_type type;
66 enum max77693_haptic_pulse_mode mode;
67
68 struct work_struct work;
69 };
70
max77693_haptic_set_duty_cycle(struct max77693_haptic * haptic)71 static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
72 {
73 struct pwm_args pargs;
74 int delta;
75 int error;
76
77 pwm_get_args(haptic->pwm_dev, &pargs);
78 delta = (pargs.period + haptic->pwm_duty) / 2;
79 error = pwm_config(haptic->pwm_dev, delta, pargs.period);
80 if (error) {
81 dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
82 return error;
83 }
84
85 return 0;
86 }
87
max77843_haptic_bias(struct max77693_haptic * haptic,bool on)88 static int max77843_haptic_bias(struct max77693_haptic *haptic, bool on)
89 {
90 int error;
91
92 if (haptic->dev_type != TYPE_MAX77843)
93 return 0;
94
95 error = regmap_update_bits(haptic->regmap_haptic,
96 MAX77843_SYS_REG_MAINCTRL1,
97 MAX77843_MAINCTRL1_BIASEN_MASK,
98 on << MAINCTRL1_BIASEN_SHIFT);
99 if (error) {
100 dev_err(haptic->dev, "failed to %s bias: %d\n",
101 on ? "enable" : "disable", error);
102 return error;
103 }
104
105 return 0;
106 }
107
max77693_haptic_configure(struct max77693_haptic * haptic,bool enable)108 static int max77693_haptic_configure(struct max77693_haptic *haptic,
109 bool enable)
110 {
111 unsigned int value, config_reg;
112 int error;
113
114 switch (haptic->dev_type) {
115 case TYPE_MAX77693:
116 value = ((haptic->type << MAX77693_CONFIG2_MODE) |
117 (enable << MAX77693_CONFIG2_MEN) |
118 (haptic->mode << MAX77693_CONFIG2_HTYP) |
119 MAX77693_HAPTIC_PWM_DIVISOR_128);
120 config_reg = MAX77693_HAPTIC_REG_CONFIG2;
121 break;
122 case TYPE_MAX77843:
123 value = (haptic->type << MCONFIG_MODE_SHIFT) |
124 (enable << MCONFIG_MEN_SHIFT) |
125 MAX77693_HAPTIC_PWM_DIVISOR_128;
126 config_reg = MAX77843_HAP_REG_MCONFIG;
127 break;
128 default:
129 return -EINVAL;
130 }
131
132 error = regmap_write(haptic->regmap_haptic,
133 config_reg, value);
134 if (error) {
135 dev_err(haptic->dev,
136 "failed to update haptic config: %d\n", error);
137 return error;
138 }
139
140 return 0;
141 }
142
max77693_haptic_lowsys(struct max77693_haptic * haptic,bool enable)143 static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
144 {
145 int error;
146
147 if (haptic->dev_type != TYPE_MAX77693)
148 return 0;
149
150 error = regmap_update_bits(haptic->regmap_pmic,
151 MAX77693_PMIC_REG_LSCNFG,
152 MAX77693_PMIC_LOW_SYS_MASK,
153 enable << MAX77693_PMIC_LOW_SYS_SHIFT);
154 if (error) {
155 dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
156 return error;
157 }
158
159 return 0;
160 }
161
max77693_haptic_enable(struct max77693_haptic * haptic)162 static void max77693_haptic_enable(struct max77693_haptic *haptic)
163 {
164 int error;
165
166 if (haptic->enabled)
167 return;
168
169 error = pwm_enable(haptic->pwm_dev);
170 if (error) {
171 dev_err(haptic->dev,
172 "failed to enable haptic pwm device: %d\n", error);
173 return;
174 }
175
176 error = max77693_haptic_lowsys(haptic, true);
177 if (error)
178 goto err_enable_lowsys;
179
180 error = max77693_haptic_configure(haptic, true);
181 if (error)
182 goto err_enable_config;
183
184 haptic->enabled = true;
185
186 return;
187
188 err_enable_config:
189 max77693_haptic_lowsys(haptic, false);
190 err_enable_lowsys:
191 pwm_disable(haptic->pwm_dev);
192 }
193
max77693_haptic_disable(struct max77693_haptic * haptic)194 static void max77693_haptic_disable(struct max77693_haptic *haptic)
195 {
196 int error;
197
198 if (!haptic->enabled)
199 return;
200
201 error = max77693_haptic_configure(haptic, false);
202 if (error)
203 return;
204
205 error = max77693_haptic_lowsys(haptic, false);
206 if (error)
207 goto err_disable_lowsys;
208
209 pwm_disable(haptic->pwm_dev);
210 haptic->enabled = false;
211
212 return;
213
214 err_disable_lowsys:
215 max77693_haptic_configure(haptic, true);
216 }
217
max77693_haptic_play_work(struct work_struct * work)218 static void max77693_haptic_play_work(struct work_struct *work)
219 {
220 struct max77693_haptic *haptic =
221 container_of(work, struct max77693_haptic, work);
222 int error;
223
224 error = max77693_haptic_set_duty_cycle(haptic);
225 if (error) {
226 dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
227 return;
228 }
229
230 if (haptic->magnitude)
231 max77693_haptic_enable(haptic);
232 else
233 max77693_haptic_disable(haptic);
234 }
235
max77693_haptic_play_effect(struct input_dev * dev,void * data,struct ff_effect * effect)236 static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
237 struct ff_effect *effect)
238 {
239 struct max77693_haptic *haptic = input_get_drvdata(dev);
240 struct pwm_args pargs;
241 u64 period_mag_multi;
242
243 haptic->magnitude = effect->u.rumble.strong_magnitude;
244 if (!haptic->magnitude)
245 haptic->magnitude = effect->u.rumble.weak_magnitude;
246
247 /*
248 * The magnitude comes from force-feedback interface.
249 * The formula to convert magnitude to pwm_duty as follows:
250 * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
251 */
252 pwm_get_args(haptic->pwm_dev, &pargs);
253 period_mag_multi = (u64)pargs.period * haptic->magnitude;
254 haptic->pwm_duty = (unsigned int)(period_mag_multi >>
255 MAX_MAGNITUDE_SHIFT);
256
257 schedule_work(&haptic->work);
258
259 return 0;
260 }
261
max77693_haptic_open(struct input_dev * dev)262 static int max77693_haptic_open(struct input_dev *dev)
263 {
264 struct max77693_haptic *haptic = input_get_drvdata(dev);
265 int error;
266
267 error = max77843_haptic_bias(haptic, true);
268 if (error)
269 return error;
270
271 error = regulator_enable(haptic->motor_reg);
272 if (error) {
273 dev_err(haptic->dev,
274 "failed to enable regulator: %d\n", error);
275 return error;
276 }
277
278 return 0;
279 }
280
max77693_haptic_close(struct input_dev * dev)281 static void max77693_haptic_close(struct input_dev *dev)
282 {
283 struct max77693_haptic *haptic = input_get_drvdata(dev);
284 int error;
285
286 cancel_work_sync(&haptic->work);
287 max77693_haptic_disable(haptic);
288
289 error = regulator_disable(haptic->motor_reg);
290 if (error)
291 dev_err(haptic->dev,
292 "failed to disable regulator: %d\n", error);
293
294 max77843_haptic_bias(haptic, false);
295 }
296
max77693_haptic_probe(struct platform_device * pdev)297 static int max77693_haptic_probe(struct platform_device *pdev)
298 {
299 struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
300 struct max77693_haptic *haptic;
301 int error;
302
303 haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
304 if (!haptic)
305 return -ENOMEM;
306
307 haptic->regmap_pmic = max77693->regmap;
308 haptic->dev = &pdev->dev;
309 haptic->type = MAX77693_HAPTIC_LRA;
310 haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
311 haptic->suspend_state = false;
312
313 /* Variant-specific init */
314 haptic->dev_type = platform_get_device_id(pdev)->driver_data;
315 switch (haptic->dev_type) {
316 case TYPE_MAX77693:
317 haptic->regmap_haptic = max77693->regmap_haptic;
318 break;
319 case TYPE_MAX77843:
320 haptic->regmap_haptic = max77693->regmap;
321 break;
322 default:
323 dev_err(&pdev->dev, "unsupported device type: %u\n",
324 haptic->dev_type);
325 return -EINVAL;
326 }
327
328 INIT_WORK(&haptic->work, max77693_haptic_play_work);
329
330 /* Get pwm and regulatot for haptic device */
331 haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
332 if (IS_ERR(haptic->pwm_dev)) {
333 dev_err(&pdev->dev, "failed to get pwm device\n");
334 return PTR_ERR(haptic->pwm_dev);
335 }
336
337 /*
338 * FIXME: pwm_apply_args() should be removed when switching to the
339 * atomic PWM API.
340 */
341 pwm_apply_args(haptic->pwm_dev);
342
343 haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
344 if (IS_ERR(haptic->motor_reg)) {
345 dev_err(&pdev->dev, "failed to get regulator\n");
346 return PTR_ERR(haptic->motor_reg);
347 }
348
349 /* Initialize input device for haptic device */
350 haptic->input_dev = devm_input_allocate_device(&pdev->dev);
351 if (!haptic->input_dev) {
352 dev_err(&pdev->dev, "failed to allocate input device\n");
353 return -ENOMEM;
354 }
355
356 haptic->input_dev->name = "max77693-haptic";
357 haptic->input_dev->id.version = 1;
358 haptic->input_dev->dev.parent = &pdev->dev;
359 haptic->input_dev->open = max77693_haptic_open;
360 haptic->input_dev->close = max77693_haptic_close;
361 input_set_drvdata(haptic->input_dev, haptic);
362 input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
363
364 error = input_ff_create_memless(haptic->input_dev, NULL,
365 max77693_haptic_play_effect);
366 if (error) {
367 dev_err(&pdev->dev, "failed to create force-feedback\n");
368 return error;
369 }
370
371 error = input_register_device(haptic->input_dev);
372 if (error) {
373 dev_err(&pdev->dev, "failed to register input device\n");
374 return error;
375 }
376
377 platform_set_drvdata(pdev, haptic);
378
379 return 0;
380 }
381
max77693_haptic_suspend(struct device * dev)382 static int __maybe_unused max77693_haptic_suspend(struct device *dev)
383 {
384 struct platform_device *pdev = to_platform_device(dev);
385 struct max77693_haptic *haptic = platform_get_drvdata(pdev);
386
387 if (haptic->enabled) {
388 max77693_haptic_disable(haptic);
389 haptic->suspend_state = true;
390 }
391
392 return 0;
393 }
394
max77693_haptic_resume(struct device * dev)395 static int __maybe_unused max77693_haptic_resume(struct device *dev)
396 {
397 struct platform_device *pdev = to_platform_device(dev);
398 struct max77693_haptic *haptic = platform_get_drvdata(pdev);
399
400 if (haptic->suspend_state) {
401 max77693_haptic_enable(haptic);
402 haptic->suspend_state = false;
403 }
404
405 return 0;
406 }
407
408 static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
409 max77693_haptic_suspend, max77693_haptic_resume);
410
411 static const struct platform_device_id max77693_haptic_id[] = {
412 { "max77693-haptic", TYPE_MAX77693 },
413 { "max77843-haptic", TYPE_MAX77843 },
414 {},
415 };
416 MODULE_DEVICE_TABLE(platform, max77693_haptic_id);
417
418 static struct platform_driver max77693_haptic_driver = {
419 .driver = {
420 .name = "max77693-haptic",
421 .pm = &max77693_haptic_pm_ops,
422 },
423 .probe = max77693_haptic_probe,
424 .id_table = max77693_haptic_id,
425 };
426 module_platform_driver(max77693_haptic_driver);
427
428 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
429 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
430 MODULE_DESCRIPTION("MAXIM 77693/77843 Haptic driver");
431 MODULE_ALIAS("platform:max77693-haptic");
432 MODULE_LICENSE("GPL");
433
