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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
36#define MAX8997_MOTOR_TYPE_SHIFT 7
37#define MAX8997_ENABLE_SHIFT 6
38#define MAX8997_MODE_SHIFT 5
39
40
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
46struct 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
70static 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
111static 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
171static 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 chip->enabled = true;
185 regulator_enable(chip->regulator);
186 max8997_haptic_configure(chip);
187 if (chip->mode == MAX8997_EXTERNAL_MODE)
188 pwm_enable(chip->pwm);
189 }
190
191out:
192 mutex_unlock(&chip->mutex);
193}
194
195static void max8997_haptic_disable(struct max8997_haptic *chip)
196{
197 mutex_lock(&chip->mutex);
198
199 if (chip->enabled) {
200 chip->enabled = false;
201 max8997_haptic_configure(chip);
202 if (chip->mode == MAX8997_EXTERNAL_MODE)
203 pwm_disable(chip->pwm);
204 regulator_disable(chip->regulator);
205 }
206
207 mutex_unlock(&chip->mutex);
208}
209
210static void max8997_haptic_play_effect_work(struct work_struct *work)
211{
212 struct max8997_haptic *chip =
213 container_of(work, struct max8997_haptic, work);
214
215 if (chip->level)
216 max8997_haptic_enable(chip);
217 else
218 max8997_haptic_disable(chip);
219}
220
221static int max8997_haptic_play_effect(struct input_dev *dev, void *data,
222 struct ff_effect *effect)
223{
224 struct max8997_haptic *chip = input_get_drvdata(dev);
225
226 chip->level = effect->u.rumble.strong_magnitude;
227 if (!chip->level)
228 chip->level = effect->u.rumble.weak_magnitude;
229
230 schedule_work(&chip->work);
231
232 return 0;
233}
234
235static void max8997_haptic_close(struct input_dev *dev)
236{
237 struct max8997_haptic *chip = input_get_drvdata(dev);
238
239 cancel_work_sync(&chip->work);
240 max8997_haptic_disable(chip);
241}
242
243static int max8997_haptic_probe(struct platform_device *pdev)
244{
245 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
246 const struct max8997_platform_data *pdata =
247 dev_get_platdata(iodev->dev);
248 const struct max8997_haptic_platform_data *haptic_pdata =
249 pdata->haptic_pdata;
250 struct max8997_haptic *chip;
251 struct input_dev *input_dev;
252 int error;
253
254 if (!haptic_pdata) {
255 dev_err(&pdev->dev, "no haptic platform data\n");
256 return -EINVAL;
257 }
258
259 chip = kzalloc(sizeof(struct max8997_haptic), GFP_KERNEL);
260 input_dev = input_allocate_device();
261 if (!chip || !input_dev) {
262 dev_err(&pdev->dev, "unable to allocate memory\n");
263 error = -ENOMEM;
264 goto err_free_mem;
265 }
266
267 INIT_WORK(&chip->work, max8997_haptic_play_effect_work);
268 mutex_init(&chip->mutex);
269
270 chip->client = iodev->haptic;
271 chip->dev = &pdev->dev;
272 chip->input_dev = input_dev;
273 chip->pwm_period = haptic_pdata->pwm_period;
274 chip->type = haptic_pdata->type;
275 chip->mode = haptic_pdata->mode;
276 chip->pwm_divisor = haptic_pdata->pwm_divisor;
277
278 switch (chip->mode) {
279 case MAX8997_INTERNAL_MODE:
280 chip->internal_mode_pattern =
281 haptic_pdata->internal_mode_pattern;
282 chip->pattern_cycle = haptic_pdata->pattern_cycle;
283 chip->pattern_signal_period =
284 haptic_pdata->pattern_signal_period;
285 break;
286
287 case MAX8997_EXTERNAL_MODE:
288 chip->pwm = pwm_request(haptic_pdata->pwm_channel_id,
289 "max8997-haptic");
290 if (IS_ERR(chip->pwm)) {
291 error = PTR_ERR(chip->pwm);
292 dev_err(&pdev->dev,
293 "unable to request PWM for haptic, error: %d\n",
294 error);
295 goto err_free_mem;
296 }
297 break;
298
299 default:
300 dev_err(&pdev->dev,
301 "Invalid chip mode specified (%d)\n", chip->mode);
302 error = -EINVAL;
303 goto err_free_mem;
304 }
305
306 chip->regulator = regulator_get(&pdev->dev, "inmotor");
307 if (IS_ERR(chip->regulator)) {
308 error = PTR_ERR(chip->regulator);
309 dev_err(&pdev->dev,
310 "unable to get regulator, error: %d\n",
311 error);
312 goto err_free_pwm;
313 }
314
315 input_dev->name = "max8997-haptic";
316 input_dev->id.version = 1;
317 input_dev->dev.parent = &pdev->dev;
318 input_dev->close = max8997_haptic_close;
319 input_set_drvdata(input_dev, chip);
320 input_set_capability(input_dev, EV_FF, FF_RUMBLE);
321
322 error = input_ff_create_memless(input_dev, NULL,
323 max8997_haptic_play_effect);
324 if (error) {
325 dev_err(&pdev->dev,
326 "unable to create FF device, error: %d\n",
327 error);
328 goto err_put_regulator;
329 }
330
331 error = input_register_device(input_dev);
332 if (error) {
333 dev_err(&pdev->dev,
334 "unable to register input device, error: %d\n",
335 error);
336 goto err_destroy_ff;
337 }
338
339 platform_set_drvdata(pdev, chip);
340 return 0;
341
342err_destroy_ff:
343 input_ff_destroy(input_dev);
344err_put_regulator:
345 regulator_put(chip->regulator);
346err_free_pwm:
347 if (chip->mode == MAX8997_EXTERNAL_MODE)
348 pwm_free(chip->pwm);
349err_free_mem:
350 input_free_device(input_dev);
351 kfree(chip);
352
353 return error;
354}
355
356static int max8997_haptic_remove(struct platform_device *pdev)
357{
358 struct max8997_haptic *chip = platform_get_drvdata(pdev);
359
360 input_unregister_device(chip->input_dev);
361 regulator_put(chip->regulator);
362
363 if (chip->mode == MAX8997_EXTERNAL_MODE)
364 pwm_free(chip->pwm);
365
366 kfree(chip);
367
368 return 0;
369}
370
371#ifdef CONFIG_PM_SLEEP
372static int max8997_haptic_suspend(struct device *dev)
373{
374 struct platform_device *pdev = to_platform_device(dev);
375 struct max8997_haptic *chip = platform_get_drvdata(pdev);
376
377 max8997_haptic_disable(chip);
378
379 return 0;
380}
381#endif
382
383static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL);
384
385static const struct platform_device_id max8997_haptic_id[] = {
386 { "max8997-haptic", 0 },
387 { },
388};
389MODULE_DEVICE_TABLE(i2c, max8997_haptic_id);
390
391static struct platform_driver max8997_haptic_driver = {
392 .driver = {
393 .name = "max8997-haptic",
394 .owner = THIS_MODULE,
395 .pm = &max8997_haptic_pm_ops,
396 },
397 .probe = max8997_haptic_probe,
398 .remove = max8997_haptic_remove,
399 .id_table = max8997_haptic_id,
400};
401module_platform_driver(max8997_haptic_driver);
402
403MODULE_ALIAS("platform:max8997-haptic");
404MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
405MODULE_DESCRIPTION("max8997_haptic driver");
406MODULE_LICENSE("GPL");
407
