1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * MAXIM MAX77693/MAX77843 Haptic device driver
4 *
5 * Copyright (C) 2014,2015 Samsung Electronics
6 * Jaewon Kim <jaewon02.kim@samsung.com>
7 * Krzysztof Kozlowski <krzk@kernel.org>
8 *
9 * This program is not provided / owned by Maxim Integrated Products.
10 */
11
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/pwm.h>
20 #include <linux/slab.h>
21 #include <linux/workqueue.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/mfd/max77693.h>
24 #include <linux/mfd/max77693-common.h>
25 #include <linux/mfd/max77693-private.h>
26 #include <linux/mfd/max77843-private.h>
27
28 #define MAX_MAGNITUDE_SHIFT 16
29
30 enum max77693_haptic_motor_type {
31 MAX77693_HAPTIC_ERM = 0,
32 MAX77693_HAPTIC_LRA,
33 };
34
35 enum max77693_haptic_pulse_mode {
36 MAX77693_HAPTIC_EXTERNAL_MODE = 0,
37 MAX77693_HAPTIC_INTERNAL_MODE,
38 };
39
40 enum max77693_haptic_pwm_divisor {
41 MAX77693_HAPTIC_PWM_DIVISOR_32 = 0,
42 MAX77693_HAPTIC_PWM_DIVISOR_64,
43 MAX77693_HAPTIC_PWM_DIVISOR_128,
44 MAX77693_HAPTIC_PWM_DIVISOR_256,
45 };
46
47 struct max77693_haptic {
48 enum max77693_types dev_type;
49
50 struct regmap *regmap_pmic;
51 struct regmap *regmap_haptic;
52 struct device *dev;
53 struct input_dev *input_dev;
54 struct pwm_device *pwm_dev;
55 struct regulator *motor_reg;
56
57 bool enabled;
58 bool suspend_state;
59 unsigned int magnitude;
60 unsigned int pwm_duty;
61 enum max77693_haptic_motor_type type;
62 enum max77693_haptic_pulse_mode mode;
63
64 struct work_struct work;
65 };
66
max77693_haptic_set_duty_cycle(struct max77693_haptic * haptic)67 static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
68 {
69 struct pwm_args pargs;
70 int delta;
71 int error;
72
73 pwm_get_args(haptic->pwm_dev, &pargs);
74 delta = (pargs.period + haptic->pwm_duty) / 2;
75 error = pwm_config(haptic->pwm_dev, delta, pargs.period);
76 if (error) {
77 dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
78 return error;
79 }
80
81 return 0;
82 }
83
max77843_haptic_bias(struct max77693_haptic * haptic,bool on)84 static int max77843_haptic_bias(struct max77693_haptic *haptic, bool on)
85 {
86 int error;
87
88 if (haptic->dev_type != TYPE_MAX77843)
89 return 0;
90
91 error = regmap_update_bits(haptic->regmap_haptic,
92 MAX77843_SYS_REG_MAINCTRL1,
93 MAX77843_MAINCTRL1_BIASEN_MASK,
94 on << MAINCTRL1_BIASEN_SHIFT);
95 if (error) {
96 dev_err(haptic->dev, "failed to %s bias: %d\n",
97 on ? "enable" : "disable", error);
98 return error;
99 }
100
101 return 0;
102 }
103
max77693_haptic_configure(struct max77693_haptic * haptic,bool enable)104 static int max77693_haptic_configure(struct max77693_haptic *haptic,
105 bool enable)
106 {
107 unsigned int value, config_reg;
108 int error;
109
110 switch (haptic->dev_type) {
111 case TYPE_MAX77693:
112 value = ((haptic->type << MAX77693_CONFIG2_MODE) |
113 (enable << MAX77693_CONFIG2_MEN) |
114 (haptic->mode << MAX77693_CONFIG2_HTYP) |
115 MAX77693_HAPTIC_PWM_DIVISOR_128);
116 config_reg = MAX77693_HAPTIC_REG_CONFIG2;
117 break;
118 case TYPE_MAX77843:
119 value = (haptic->type << MCONFIG_MODE_SHIFT) |
120 (enable << MCONFIG_MEN_SHIFT) |
121 MAX77693_HAPTIC_PWM_DIVISOR_128;
122 config_reg = MAX77843_HAP_REG_MCONFIG;
123 break;
124 default:
125 return -EINVAL;
126 }
127
128 error = regmap_write(haptic->regmap_haptic,
129 config_reg, value);
130 if (error) {
131 dev_err(haptic->dev,
132 "failed to update haptic config: %d\n", error);
133 return error;
134 }
135
136 return 0;
137 }
138
max77693_haptic_lowsys(struct max77693_haptic * haptic,bool enable)139 static int max77693_haptic_lowsys(struct max77693_haptic *haptic, bool enable)
140 {
141 int error;
142
143 if (haptic->dev_type != TYPE_MAX77693)
144 return 0;
145
146 error = regmap_update_bits(haptic->regmap_pmic,
147 MAX77693_PMIC_REG_LSCNFG,
148 MAX77693_PMIC_LOW_SYS_MASK,
149 enable << MAX77693_PMIC_LOW_SYS_SHIFT);
150 if (error) {
151 dev_err(haptic->dev, "cannot update pmic regmap: %d\n", error);
152 return error;
153 }
154
155 return 0;
156 }
157
max77693_haptic_enable(struct max77693_haptic * haptic)158 static void max77693_haptic_enable(struct max77693_haptic *haptic)
159 {
160 int error;
161
162 if (haptic->enabled)
163 return;
164
165 error = pwm_enable(haptic->pwm_dev);
166 if (error) {
167 dev_err(haptic->dev,
168 "failed to enable haptic pwm device: %d\n", error);
169 return;
170 }
171
172 error = max77693_haptic_lowsys(haptic, true);
173 if (error)
174 goto err_enable_lowsys;
175
176 error = max77693_haptic_configure(haptic, true);
177 if (error)
178 goto err_enable_config;
179
180 haptic->enabled = true;
181
182 return;
183
184 err_enable_config:
185 max77693_haptic_lowsys(haptic, false);
186 err_enable_lowsys:
187 pwm_disable(haptic->pwm_dev);
188 }
189
max77693_haptic_disable(struct max77693_haptic * haptic)190 static void max77693_haptic_disable(struct max77693_haptic *haptic)
191 {
192 int error;
193
194 if (!haptic->enabled)
195 return;
196
197 error = max77693_haptic_configure(haptic, false);
198 if (error)
199 return;
200
201 error = max77693_haptic_lowsys(haptic, false);
202 if (error)
203 goto err_disable_lowsys;
204
205 pwm_disable(haptic->pwm_dev);
206 haptic->enabled = false;
207
208 return;
209
210 err_disable_lowsys:
211 max77693_haptic_configure(haptic, true);
212 }
213
max77693_haptic_play_work(struct work_struct * work)214 static void max77693_haptic_play_work(struct work_struct *work)
215 {
216 struct max77693_haptic *haptic =
217 container_of(work, struct max77693_haptic, work);
218 int error;
219
220 error = max77693_haptic_set_duty_cycle(haptic);
221 if (error) {
222 dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
223 return;
224 }
225
226 if (haptic->magnitude)
227 max77693_haptic_enable(haptic);
228 else
229 max77693_haptic_disable(haptic);
230 }
231
max77693_haptic_play_effect(struct input_dev * dev,void * data,struct ff_effect * effect)232 static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
233 struct ff_effect *effect)
234 {
235 struct max77693_haptic *haptic = input_get_drvdata(dev);
236 struct pwm_args pargs;
237 u64 period_mag_multi;
238
239 haptic->magnitude = effect->u.rumble.strong_magnitude;
240 if (!haptic->magnitude)
241 haptic->magnitude = effect->u.rumble.weak_magnitude;
242
243 /*
244 * The magnitude comes from force-feedback interface.
245 * The formula to convert magnitude to pwm_duty as follows:
246 * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
247 */
248 pwm_get_args(haptic->pwm_dev, &pargs);
249 period_mag_multi = (u64)pargs.period * haptic->magnitude;
250 haptic->pwm_duty = (unsigned int)(period_mag_multi >>
251 MAX_MAGNITUDE_SHIFT);
252
253 schedule_work(&haptic->work);
254
255 return 0;
256 }
257
max77693_haptic_open(struct input_dev * dev)258 static int max77693_haptic_open(struct input_dev *dev)
259 {
260 struct max77693_haptic *haptic = input_get_drvdata(dev);
261 int error;
262
263 error = max77843_haptic_bias(haptic, true);
264 if (error)
265 return error;
266
267 error = regulator_enable(haptic->motor_reg);
268 if (error) {
269 dev_err(haptic->dev,
270 "failed to enable regulator: %d\n", error);
271 return error;
272 }
273
274 return 0;
275 }
276
max77693_haptic_close(struct input_dev * dev)277 static void max77693_haptic_close(struct input_dev *dev)
278 {
279 struct max77693_haptic *haptic = input_get_drvdata(dev);
280 int error;
281
282 cancel_work_sync(&haptic->work);
283 max77693_haptic_disable(haptic);
284
285 error = regulator_disable(haptic->motor_reg);
286 if (error)
287 dev_err(haptic->dev,
288 "failed to disable regulator: %d\n", error);
289
290 max77843_haptic_bias(haptic, false);
291 }
292
max77693_haptic_probe(struct platform_device * pdev)293 static int max77693_haptic_probe(struct platform_device *pdev)
294 {
295 struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
296 struct max77693_haptic *haptic;
297 int error;
298
299 haptic = devm_kzalloc(&pdev->dev, sizeof(*haptic), GFP_KERNEL);
300 if (!haptic)
301 return -ENOMEM;
302
303 haptic->regmap_pmic = max77693->regmap;
304 haptic->dev = &pdev->dev;
305 haptic->type = MAX77693_HAPTIC_LRA;
306 haptic->mode = MAX77693_HAPTIC_EXTERNAL_MODE;
307 haptic->suspend_state = false;
308
309 /* Variant-specific init */
310 haptic->dev_type = platform_get_device_id(pdev)->driver_data;
311 switch (haptic->dev_type) {
312 case TYPE_MAX77693:
313 haptic->regmap_haptic = max77693->regmap_haptic;
314 break;
315 case TYPE_MAX77843:
316 haptic->regmap_haptic = max77693->regmap;
317 break;
318 default:
319 dev_err(&pdev->dev, "unsupported device type: %u\n",
320 haptic->dev_type);
321 return -EINVAL;
322 }
323
324 INIT_WORK(&haptic->work, max77693_haptic_play_work);
325
326 /* Get pwm and regulatot for haptic device */
327 haptic->pwm_dev = devm_pwm_get(&pdev->dev, NULL);
328 if (IS_ERR(haptic->pwm_dev)) {
329 dev_err(&pdev->dev, "failed to get pwm device\n");
330 return PTR_ERR(haptic->pwm_dev);
331 }
332
333 /*
334 * FIXME: pwm_apply_args() should be removed when switching to the
335 * atomic PWM API.
336 */
337 pwm_apply_args(haptic->pwm_dev);
338
339 haptic->motor_reg = devm_regulator_get(&pdev->dev, "haptic");
340 if (IS_ERR(haptic->motor_reg)) {
341 dev_err(&pdev->dev, "failed to get regulator\n");
342 return PTR_ERR(haptic->motor_reg);
343 }
344
345 /* Initialize input device for haptic device */
346 haptic->input_dev = devm_input_allocate_device(&pdev->dev);
347 if (!haptic->input_dev) {
348 dev_err(&pdev->dev, "failed to allocate input device\n");
349 return -ENOMEM;
350 }
351
352 haptic->input_dev->name = "max77693-haptic";
353 haptic->input_dev->id.version = 1;
354 haptic->input_dev->dev.parent = &pdev->dev;
355 haptic->input_dev->open = max77693_haptic_open;
356 haptic->input_dev->close = max77693_haptic_close;
357 input_set_drvdata(haptic->input_dev, haptic);
358 input_set_capability(haptic->input_dev, EV_FF, FF_RUMBLE);
359
360 error = input_ff_create_memless(haptic->input_dev, NULL,
361 max77693_haptic_play_effect);
362 if (error) {
363 dev_err(&pdev->dev, "failed to create force-feedback\n");
364 return error;
365 }
366
367 error = input_register_device(haptic->input_dev);
368 if (error) {
369 dev_err(&pdev->dev, "failed to register input device\n");
370 return error;
371 }
372
373 platform_set_drvdata(pdev, haptic);
374
375 return 0;
376 }
377
max77693_haptic_suspend(struct device * dev)378 static int __maybe_unused max77693_haptic_suspend(struct device *dev)
379 {
380 struct platform_device *pdev = to_platform_device(dev);
381 struct max77693_haptic *haptic = platform_get_drvdata(pdev);
382
383 if (haptic->enabled) {
384 max77693_haptic_disable(haptic);
385 haptic->suspend_state = true;
386 }
387
388 return 0;
389 }
390
max77693_haptic_resume(struct device * dev)391 static int __maybe_unused max77693_haptic_resume(struct device *dev)
392 {
393 struct platform_device *pdev = to_platform_device(dev);
394 struct max77693_haptic *haptic = platform_get_drvdata(pdev);
395
396 if (haptic->suspend_state) {
397 max77693_haptic_enable(haptic);
398 haptic->suspend_state = false;
399 }
400
401 return 0;
402 }
403
404 static SIMPLE_DEV_PM_OPS(max77693_haptic_pm_ops,
405 max77693_haptic_suspend, max77693_haptic_resume);
406
407 static const struct platform_device_id max77693_haptic_id[] = {
408 { "max77693-haptic", TYPE_MAX77693 },
409 { "max77843-haptic", TYPE_MAX77843 },
410 {},
411 };
412 MODULE_DEVICE_TABLE(platform, max77693_haptic_id);
413
414 static struct platform_driver max77693_haptic_driver = {
415 .driver = {
416 .name = "max77693-haptic",
417 .pm = &max77693_haptic_pm_ops,
418 },
419 .probe = max77693_haptic_probe,
420 .id_table = max77693_haptic_id,
421 };
422 module_platform_driver(max77693_haptic_driver);
423
424 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
425 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
426 MODULE_DESCRIPTION("MAXIM 77693/77843 Haptic driver");
427 MODULE_LICENSE("GPL");
428