1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * MAX8997-haptic controller driver
4 *
5 * Copyright (C) 2012 Samsung Electronics
6 * Donggeun Kim <dg77.kim@samsung.com>
7 *
8 * This program is not provided / owned by Maxim Integrated Products.
9 */
10
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/err.h>
15 #include <linux/pwm.h>
16 #include <linux/input.h>
17 #include <linux/mfd/max8997-private.h>
18 #include <linux/mfd/max8997.h>
19 #include <linux/regulator/consumer.h>
20
21 /* Haptic configuration 2 register */
22 #define MAX8997_MOTOR_TYPE_SHIFT 7
23 #define MAX8997_ENABLE_SHIFT 6
24 #define MAX8997_MODE_SHIFT 5
25
26 /* Haptic driver configuration register */
27 #define MAX8997_CYCLE_SHIFT 6
28 #define MAX8997_SIG_PERIOD_SHIFT 4
29 #define MAX8997_SIG_DUTY_SHIFT 2
30 #define MAX8997_PWM_DUTY_SHIFT 0
31
32 struct max8997_haptic {
33 struct device *dev;
34 struct i2c_client *client;
35 struct input_dev *input_dev;
36 struct regulator *regulator;
37
38 struct work_struct work;
39 struct mutex mutex;
40
41 bool enabled;
42 unsigned int level;
43
44 struct pwm_device *pwm;
45 unsigned int pwm_period;
46 enum max8997_haptic_pwm_divisor pwm_divisor;
47
48 enum max8997_haptic_motor_type type;
49 enum max8997_haptic_pulse_mode mode;
50
51 unsigned int internal_mode_pattern;
52 unsigned int pattern_cycle;
53 unsigned int pattern_signal_period;
54 };
55
max8997_haptic_set_duty_cycle(struct max8997_haptic * chip)56 static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
57 {
58 int ret = 0;
59
60 if (chip->mode == MAX8997_EXTERNAL_MODE) {
61 unsigned int duty = chip->pwm_period * chip->level / 100;
62 ret = pwm_config(chip->pwm, duty, chip->pwm_period);
63 } else {
64 u8 duty_index = 0;
65
66 duty_index = DIV_ROUND_UP(chip->level * 64, 100);
67
68 switch (chip->internal_mode_pattern) {
69 case 0:
70 max8997_write_reg(chip->client,
71 MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
72 break;
73 case 1:
74 max8997_write_reg(chip->client,
75 MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
76 break;
77 case 2:
78 max8997_write_reg(chip->client,
79 MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
80 break;
81 case 3:
82 max8997_write_reg(chip->client,
83 MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
84 break;
85 default:
86 break;
87 }
88 }
89 return ret;
90 }
91
max8997_haptic_configure(struct max8997_haptic * chip)92 static void max8997_haptic_configure(struct max8997_haptic *chip)
93 {
94 u8 value;
95
96 value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
97 chip->enabled << MAX8997_ENABLE_SHIFT |
98 chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
99 max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
100
101 if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
102 value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
103 chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
104 chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
105 chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
106 max8997_write_reg(chip->client,
107 MAX8997_HAPTIC_REG_DRVCONF, value);
108
109 switch (chip->internal_mode_pattern) {
110 case 0:
111 value = chip->pattern_cycle << 4;
112 max8997_write_reg(chip->client,
113 MAX8997_HAPTIC_REG_CYCLECONF1, value);
114 value = chip->pattern_signal_period;
115 max8997_write_reg(chip->client,
116 MAX8997_HAPTIC_REG_SIGCONF1, value);
117 break;
118
119 case 1:
120 value = chip->pattern_cycle;
121 max8997_write_reg(chip->client,
122 MAX8997_HAPTIC_REG_CYCLECONF1, value);
123 value = chip->pattern_signal_period;
124 max8997_write_reg(chip->client,
125 MAX8997_HAPTIC_REG_SIGCONF2, value);
126 break;
127
128 case 2:
129 value = chip->pattern_cycle << 4;
130 max8997_write_reg(chip->client,
131 MAX8997_HAPTIC_REG_CYCLECONF2, value);
132 value = chip->pattern_signal_period;
133 max8997_write_reg(chip->client,
134 MAX8997_HAPTIC_REG_SIGCONF3, value);
135 break;
136
137 case 3:
138 value = chip->pattern_cycle;
139 max8997_write_reg(chip->client,
140 MAX8997_HAPTIC_REG_CYCLECONF2, value);
141 value = chip->pattern_signal_period;
142 max8997_write_reg(chip->client,
143 MAX8997_HAPTIC_REG_SIGCONF4, value);
144 break;
145
146 default:
147 break;
148 }
149 }
150 }
151
max8997_haptic_enable(struct max8997_haptic * chip)152 static void max8997_haptic_enable(struct max8997_haptic *chip)
153 {
154 int error;
155
156 mutex_lock(&chip->mutex);
157
158 error = max8997_haptic_set_duty_cycle(chip);
159 if (error) {
160 dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
161 goto out;
162 }
163
164 if (!chip->enabled) {
165 error = regulator_enable(chip->regulator);
166 if (error) {
167 dev_err(chip->dev, "Failed to enable regulator\n");
168 goto out;
169 }
170 max8997_haptic_configure(chip);
171 if (chip->mode == MAX8997_EXTERNAL_MODE) {
172 error = pwm_enable(chip->pwm);
173 if (error) {
174 dev_err(chip->dev, "Failed to enable PWM\n");
175 regulator_disable(chip->regulator);
176 goto out;
177 }
178 }
179 chip->enabled = true;
180 }
181
182 out:
183 mutex_unlock(&chip->mutex);
184 }
185
max8997_haptic_disable(struct max8997_haptic * chip)186 static void max8997_haptic_disable(struct max8997_haptic *chip)
187 {
188 mutex_lock(&chip->mutex);
189
190 if (chip->enabled) {
191 chip->enabled = false;
192 max8997_haptic_configure(chip);
193 if (chip->mode == MAX8997_EXTERNAL_MODE)
194 pwm_disable(chip->pwm);
195 regulator_disable(chip->regulator);
196 }
197
198 mutex_unlock(&chip->mutex);
199 }
200
max8997_haptic_play_effect_work(struct work_struct * work)201 static void max8997_haptic_play_effect_work(struct work_struct *work)
202 {
203 struct max8997_haptic *chip =
204 container_of(work, struct max8997_haptic, work);
205
206 if (chip->level)
207 max8997_haptic_enable(chip);
208 else
209 max8997_haptic_disable(chip);
210 }
211
max8997_haptic_play_effect(struct input_dev * dev,void * data,struct ff_effect * effect)212 static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
213 struct ff_effect *effect)
214 {
215 struct max8997_haptic *chip = input_get_drvdata(dev);
216
217 chip->level = effect->u.rumble.strong_magnitude;
218 if (!chip->level)
219 chip->level = effect->u.rumble.weak_magnitude;
220
221 schedule_work(&chip->work);
222
223 return 0;
224 }
225
max8997_haptic_close(struct input_dev * dev)226 static void max8997_haptic_close(struct input_dev *dev)
227 {
228 struct max8997_haptic *chip = input_get_drvdata(dev);
229
230 cancel_work_sync(&chip->work);
231 max8997_haptic_disable(chip);
232 }
233
max8997_haptic_probe(struct platform_device * pdev)234 static int max8997_haptic_probe(struct platform_device *pdev)
235 {
236 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
237 const struct max8997_platform_data *pdata =
238 dev_get_platdata(iodev->dev);
239 const struct max8997_haptic_platform_data *haptic_pdata = NULL;
240 struct max8997_haptic *chip;
241 struct input_dev *input_dev;
242 int error;
243
244 if (pdata)
245 haptic_pdata = pdata->haptic_pdata;
246
247 if (!haptic_pdata) {
248 dev_err(&pdev->dev, "no haptic platform data\n");
249 return -EINVAL;
250 }
251
252 chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
253 input_dev = input_allocate_device();
254 if (!chip || !input_dev) {
255 dev_err(&pdev->dev, "unable to allocate memory\n");
256 error = -ENOMEM;
257 goto err_free_mem;
258 }
259
260 INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
261 mutex_init(&chip->mutex);
262
263 chip->client = iodev->haptic;
264 chip->dev = &pdev->dev;
265 chip->input_dev = input_dev;
266 chip->pwm_period = haptic_pdata->pwm_period;
267 chip->type = haptic_pdata->type;
268 chip->mode = haptic_pdata->mode;
269 chip->pwm_divisor = haptic_pdata->pwm_divisor;
270
271 switch (chip->mode) {
272 case MAX8997_INTERNAL_MODE:
273 chip->internal_mode_pattern =
274 haptic_pdata->internal_mode_pattern;
275 chip->pattern_cycle = haptic_pdata->pattern_cycle;
276 chip->pattern_signal_period =
277 haptic_pdata->pattern_signal_period;
278 break;
279
280 case MAX8997_EXTERNAL_MODE:
281 chip->pwm = pwm_get(&pdev->dev, NULL);
282 if (IS_ERR(chip->pwm)) {
283 error = PTR_ERR(chip->pwm);
284 dev_err(&pdev->dev,
285 "unable to request PWM for haptic, error: %d\n",
286 error);
287 goto err_free_mem;
288 }
289
290 /*
291 * FIXME: pwm_apply_args() should be removed when switching to
292 * the atomic PWM API.
293 */
294 pwm_apply_args(chip->pwm);
295 break;
296
297 default:
298 dev_err(&pdev->dev,
299 "Invalid chip mode specified (%d)\n", chip->mode);
300 error = -EINVAL;
301 goto err_free_mem;
302 }
303
304 chip->regulator = regulator_get(&pdev->dev, "inmotor");
305 if (IS_ERR(chip->regulator)) {
306 error = PTR_ERR(chip->regulator);
307 dev_err(&pdev->dev,
308 "unable to get regulator, error: %d\n",
309 error);
310 goto err_free_pwm;
311 }
312
313 input_dev->name = "max8997-haptic";
314 input_dev->id.version = 1;
315 input_dev->dev.parent = &pdev->dev;
316 input_dev->close = max8997_haptic_close;
317 input_set_drvdata(input_dev, chip);
318 input_set_capability(input_dev, EV_FF, FF_RUMBLE);
319
320 error = input_ff_create_memless(input_dev, NULL,
321 max8997_haptic_play_effect);
322 if (error) {
323 dev_err(&pdev->dev,
324 "unable to create FF device, error: %d\n",
325 error);
326 goto err_put_regulator;
327 }
328
329 error = input_register_device(input_dev);
330 if (error) {
331 dev_err(&pdev->dev,
332 "unable to register input device, error: %d\n",
333 error);
334 goto err_destroy_ff;
335 }
336
337 platform_set_drvdata(pdev, chip);
338 return 0;
339
340 err_destroy_ff:
341 input_ff_destroy(input_dev);
342 err_put_regulator:
343 regulator_put(chip->regulator);
344 err_free_pwm:
345 if (chip->mode == MAX8997_EXTERNAL_MODE)
346 pwm_put(chip->pwm);
347 err_free_mem:
348 input_free_device(input_dev);
349 kfree(chip);
350
351 return error;
352 }
353
max8997_haptic_remove(struct platform_device * pdev)354 static int max8997_haptic_remove(struct platform_device *pdev)
355 {
356 struct max8997_haptic *chip = platform_get_drvdata(pdev);
357
358 input_unregister_device(chip->input_dev);
359 regulator_put(chip->regulator);
360
361 if (chip->mode == MAX8997_EXTERNAL_MODE)
362 pwm_put(chip->pwm);
363
364 kfree(chip);
365
366 return 0;
367 }
368
max8997_haptic_suspend(struct device * dev)369 static int max8997_haptic_suspend(struct device *dev)
370 {
371 struct platform_device *pdev = to_platform_device(dev);
372 struct max8997_haptic *chip = platform_get_drvdata(pdev);
373
374 max8997_haptic_disable(chip);
375
376 return 0;
377 }
378
379 static DEFINE_SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops,
380 max8997_haptic_suspend, NULL);
381
382 static const struct platform_device_id max8997_haptic_id[] = {
383 { "max8997-haptic", 0 },
384 { },
385 };
386 MODULE_DEVICE_TABLE(platform, max8997_haptic_id);
387
388 static struct platform_driver max8997_haptic_driver = {
389 .driver = {
390 .name = "max8997-haptic",
391 .pm = pm_sleep_ptr(&max8997_haptic_pm_ops),
392 },
393 .probe = max8997_haptic_probe,
394 .remove = max8997_haptic_remove,
395 .id_table = max8997_haptic_id,
396 };
397 module_platform_driver(max8997_haptic_driver);
398
399 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
400 MODULE_DESCRIPTION("max8997_haptic driver");
401 MODULE_LICENSE("GPL");
402