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Linux/drivers/input/misc/max8997_haptic.c

  1 /*
  2  * MAX8997-haptic controller driver
  3  *
  4  * Copyright (C) 2012 Samsung Electronics
  5  * Donggeun Kim <dg77.kim@samsung.com>
  6  *
  7  * This program is not provided / owned by Maxim Integrated Products.
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  *
 23  */
 24 
 25 #include <linux/module.h>
 26 #include <linux/slab.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/err.h>
 29 #include <linux/pwm.h>
 30 #include <linux/input.h>
 31 #include <linux/mfd/max8997-private.h>
 32 #include <linux/mfd/max8997.h>
 33 #include <linux/regulator/consumer.h>
 34 
 35 /* Haptic configuration 2 register */
 36 #define MAX8997_MOTOR_TYPE_SHIFT        7
 37 #define MAX8997_ENABLE_SHIFT            6
 38 #define MAX8997_MODE_SHIFT              5
 39 
 40 /* Haptic driver configuration register */
 41 #define MAX8997_CYCLE_SHIFT             6
 42 #define MAX8997_SIG_PERIOD_SHIFT        4
 43 #define MAX8997_SIG_DUTY_SHIFT          2
 44 #define MAX8997_PWM_DUTY_SHIFT          0
 45 
 46 struct max8997_haptic {
 47         struct device *dev;
 48         struct i2c_client *client;
 49         struct input_dev *input_dev;
 50         struct regulator *regulator;
 51 
 52         struct work_struct work;
 53         struct mutex mutex;
 54 
 55         bool enabled;
 56         unsigned int level;
 57 
 58         struct pwm_device *pwm;
 59         unsigned int pwm_period;
 60         enum max8997_haptic_pwm_divisor pwm_divisor;
 61 
 62         enum max8997_haptic_motor_type type;
 63         enum max8997_haptic_pulse_mode mode;
 64 
 65         unsigned int internal_mode_pattern;
 66         unsigned int pattern_cycle;
 67         unsigned int pattern_signal_period;
 68 };
 69 
 70 static int max8997_haptic_set_duty_cycle(struct max8997_haptic *chip)
 71 {
 72         int ret = 0;
 73 
 74         if (chip->mode == MAX8997_EXTERNAL_MODE) {
 75                 unsigned int duty = chip->pwm_period * chip->level / 100;
 76                 ret = pwm_config(chip->pwm, duty, chip->pwm_period);
 77         } else {
 78                 int i;
 79                 u8 duty_index = 0;
 80 
 81                 for (i = 0; i <= 64; i++) {
 82                         if (chip->level <= i * 100 / 64) {
 83                                 duty_index = i;
 84                                 break;
 85                         }
 86                 }
 87                 switch (chip->internal_mode_pattern) {
 88                 case 0:
 89                         max8997_write_reg(chip->client,
 90                                 MAX8997_HAPTIC_REG_SIGPWMDC1, duty_index);
 91                         break;
 92                 case 1:
 93                         max8997_write_reg(chip->client,
 94                                 MAX8997_HAPTIC_REG_SIGPWMDC2, duty_index);
 95                         break;
 96                 case 2:
 97                         max8997_write_reg(chip->client,
 98                                 MAX8997_HAPTIC_REG_SIGPWMDC3, duty_index);
 99                         break;
100                 case 3:
101                         max8997_write_reg(chip->client,
102                                 MAX8997_HAPTIC_REG_SIGPWMDC4, duty_index);
103                         break;
104                 default:
105                         break;
106                 }
107         }
108         return ret;
109 }
110 
111 static void max8997_haptic_configure(struct max8997_haptic *chip)
112 {
113         u8 value;
114 
115         value = chip->type << MAX8997_MOTOR_TYPE_SHIFT |
116                 chip->enabled << MAX8997_ENABLE_SHIFT |
117                 chip->mode << MAX8997_MODE_SHIFT | chip->pwm_divisor;
118         max8997_write_reg(chip->client, MAX8997_HAPTIC_REG_CONF2, value);
119 
120         if (chip->mode == MAX8997_INTERNAL_MODE && chip->enabled) {
121                 value = chip->internal_mode_pattern << MAX8997_CYCLE_SHIFT |
122                         chip->internal_mode_pattern << MAX8997_SIG_PERIOD_SHIFT |
123                         chip->internal_mode_pattern << MAX8997_SIG_DUTY_SHIFT |
124                         chip->internal_mode_pattern << MAX8997_PWM_DUTY_SHIFT;
125                 max8997_write_reg(chip->client,
126                         MAX8997_HAPTIC_REG_DRVCONF, value);
127 
128                 switch (chip->internal_mode_pattern) {
129                 case 0:
130                         value = chip->pattern_cycle << 4;
131                         max8997_write_reg(chip->client,
132                                 MAX8997_HAPTIC_REG_CYCLECONF1, value);
133                         value = chip->pattern_signal_period;
134                         max8997_write_reg(chip->client,
135                                 MAX8997_HAPTIC_REG_SIGCONF1, value);
136                         break;
137 
138                 case 1:
139                         value = chip->pattern_cycle;
140                         max8997_write_reg(chip->client,
141                                 MAX8997_HAPTIC_REG_CYCLECONF1, value);
142                         value = chip->pattern_signal_period;
143                         max8997_write_reg(chip->client,
144                                 MAX8997_HAPTIC_REG_SIGCONF2, value);
145                         break;
146 
147                 case 2:
148                         value = chip->pattern_cycle << 4;
149                         max8997_write_reg(chip->client,
150                                 MAX8997_HAPTIC_REG_CYCLECONF2, value);
151                         value = chip->pattern_signal_period;
152                         max8997_write_reg(chip->client,
153                                 MAX8997_HAPTIC_REG_SIGCONF3, value);
154                         break;
155 
156                 case 3:
157                         value = chip->pattern_cycle;
158                         max8997_write_reg(chip->client,
159                                 MAX8997_HAPTIC_REG_CYCLECONF2, value);
160                         value = chip->pattern_signal_period;
161                         max8997_write_reg(chip->client,
162                                 MAX8997_HAPTIC_REG_SIGCONF4, value);
163                         break;
164 
165                 default:
166                         break;
167                 }
168         }
169 }
170 
171 static void max8997_haptic_enable(struct max8997_haptic *chip)
172 {
173         int error;
174 
175         mutex_lock(&chip->mutex);
176 
177         error = max8997_haptic_set_duty_cycle(chip);
178         if (error) {
179                 dev_err(chip->dev, "set_pwm_cycle failed, error: %d\n", error);
180                 goto out;
181         }
182 
183         if (!chip->enabled) {
184                 error = regulator_enable(chip->regulator);
185                 if (error) {
186                         dev_err(chip->dev, "Failed to enable regulator\n");
187                         goto out;
188                 }
189                 max8997_haptic_configure(chip);
190                 if (chip->mode == MAX8997_EXTERNAL_MODE) {
191                         error = pwm_enable(chip->pwm);
192                         if (error) {
193                                 dev_err(chip->dev, "Failed to enable PWM\n");
194                                 regulator_disable(chip->regulator);
195                                 goto out;
196                         }
197                 }
198                 chip->enabled = true;
199         }
200 
201 out:
202         mutex_unlock(&chip->mutex);
203 }
204 
205 static void max8997_haptic_disable(struct max8997_haptic *chip)
206 {
207         mutex_lock(&chip->mutex);
208 
209         if (chip->enabled) {
210                 chip->enabled = false;
211                 max8997_haptic_configure(chip);
212                 if (chip->mode == MAX8997_EXTERNAL_MODE)
213                         pwm_disable(chip->pwm);
214                 regulator_disable(chip->regulator);
215         }
216 
217         mutex_unlock(&chip->mutex);
218 }
219 
220 static void max8997_haptic_play_effect_work(struct work_struct *work)
221 {
222         struct max8997_haptic *chip =
223                         container_of(work, struct max8997_haptic, work);
224 
225         if (chip->level)
226                 max8997_haptic_enable(chip);
227         else
228                 max8997_haptic_disable(chip);
229 }
230 
231 static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
232                                   struct ff_effect *effect)
233 {
234         struct max8997_haptic *chip = input_get_drvdata(dev);
235 
236         chip->level = effect->u.rumble.strong_magnitude;
237         if (!chip->level)
238                 chip->level = effect->u.rumble.weak_magnitude;
239 
240         schedule_work(&chip->work);
241 
242         return 0;
243 }
244 
245 static void max8997_haptic_close(struct input_dev *dev)
246 {
247         struct max8997_haptic *chip = input_get_drvdata(dev);
248 
249         cancel_work_sync(&chip->work);
250         max8997_haptic_disable(chip);
251 }
252 
253 static int max8997_haptic_probe(struct platform_device *pdev)
254 {
255         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
256         const struct max8997_platform_data *pdata =
257                                         dev_get_platdata(iodev->dev);
258         const struct max8997_haptic_platform_data *haptic_pdata =
259                                         pdata->haptic_pdata;
260         struct max8997_haptic *chip;
261         struct input_dev *input_dev;
262         int error;
263 
264         if (!haptic_pdata) {
265                 dev_err(&pdev->dev, "no haptic platform data\n");
266                 return -EINVAL;
267         }
268 
269         chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
270         input_dev = input_allocate_device();
271         if (!chip || !input_dev) {
272                 dev_err(&pdev->dev, "unable to allocate memory\n");
273                 error = -ENOMEM;
274                 goto err_free_mem;
275         }
276 
277         INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
278         mutex_init(&chip->mutex);
279 
280         chip->client = iodev->haptic;
281         chip->dev = &pdev->dev;
282         chip->input_dev = input_dev;
283         chip->pwm_period = haptic_pdata->pwm_period;
284         chip->type = haptic_pdata->type;
285         chip->mode = haptic_pdata->mode;
286         chip->pwm_divisor = haptic_pdata->pwm_divisor;
287 
288         switch (chip->mode) {
289         case MAX8997_INTERNAL_MODE:
290                 chip->internal_mode_pattern =
291                                 haptic_pdata->internal_mode_pattern;
292                 chip->pattern_cycle = haptic_pdata->pattern_cycle;
293                 chip->pattern_signal_period =
294                                 haptic_pdata->pattern_signal_period;
295                 break;
296 
297         case MAX8997_EXTERNAL_MODE:
298                 chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
299                                         "max8997-haptic");
300                 if (IS_ERR(chip->pwm)) {
301                         error = PTR_ERR(chip->pwm);
302                         dev_err(&pdev->dev,
303                                 "unable to request PWM for haptic, error: %d\n",
304                                 error);
305                         goto err_free_mem;
306                 }
307                 break;
308 
309         default:
310                 dev_err(&pdev->dev,
311                         "Invalid chip mode specified (%d)\n", chip->mode);
312                 error = -EINVAL;
313                 goto err_free_mem;
314         }
315 
316         chip->regulator = regulator_get(&pdev->dev, "inmotor");
317         if (IS_ERR(chip->regulator)) {
318                 error = PTR_ERR(chip->regulator);
319                 dev_err(&pdev->dev,
320                         "unable to get regulator, error: %d\n",
321                         error);
322                 goto err_free_pwm;
323         }
324 
325         input_dev->name = "max8997-haptic";
326         input_dev->id.version = 1;
327         input_dev->dev.parent = &pdev->dev;
328         input_dev->close = max8997_haptic_close;
329         input_set_drvdata(input_dev, chip);
330         input_set_capability(input_dev, EV_FF, FF_RUMBLE);
331 
332         error = input_ff_create_memless(input_dev, NULL,
333                                 max8997_haptic_play_effect);
334         if (error) {
335                 dev_err(&pdev->dev,
336                         "unable to create FF device, error: %d\n",
337                         error);
338                 goto err_put_regulator;
339         }
340 
341         error = input_register_device(input_dev);
342         if (error) {
343                 dev_err(&pdev->dev,
344                         "unable to register input device, error: %d\n",
345                         error);
346                 goto err_destroy_ff;
347         }
348 
349         platform_set_drvdata(pdev, chip);
350         return 0;
351 
352 err_destroy_ff:
353         input_ff_destroy(input_dev);
354 err_put_regulator:
355         regulator_put(chip->regulator);
356 err_free_pwm:
357         if (chip->mode == MAX8997_EXTERNAL_MODE)
358                 pwm_free(chip->pwm);
359 err_free_mem:
360         input_free_device(input_dev);
361         kfree(chip);
362 
363         return error;
364 }
365 
366 static int max8997_haptic_remove(struct platform_device *pdev)
367 {
368         struct max8997_haptic *chip = platform_get_drvdata(pdev);
369 
370         input_unregister_device(chip->input_dev);
371         regulator_put(chip->regulator);
372 
373         if (chip->mode == MAX8997_EXTERNAL_MODE)
374                 pwm_free(chip->pwm);
375 
376         kfree(chip);
377 
378         return 0;
379 }
380 
381 #ifdef CONFIG_PM_SLEEP
382 static int max8997_haptic_suspend(struct device *dev)
383 {
384         struct platform_device *pdev = to_platform_device(dev);
385         struct max8997_haptic *chip = platform_get_drvdata(pdev);
386 
387         max8997_haptic_disable(chip);
388 
389         return 0;
390 }
391 #endif
392 
393 static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);
394 
395 static const struct platform_device_id max8997_haptic_id[] = {
396         { "max8997-haptic", 0 },
397         { },
398 };
399 MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);
400 
401 static struct platform_driver max8997_haptic_driver = {
402         .driver = {
403                 .name   = "max8997-haptic",
404                 .owner  = THIS_MODULE,
405                 .pm     = &max8997_haptic_pm_ops,
406         },
407         .probe          = max8997_haptic_probe,
408         .remove         = max8997_haptic_remove,
409         .id_table       = max8997_haptic_id,
410 };
411 module_platform_driver(max8997_haptic_driver);
412 
413 MODULE_ALIAS("platform:max8997-haptic");
414 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
415 MODULE_DESCRIPTION("max8997_haptic driver");
416 MODULE_LICENSE("GPL");
417 

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