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104594b0 DK |
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> | |
104594b0 DK |
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 | 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 | ||
191 | out: | |
192 | mutex_unlock(&chip->mutex); | |
193 | } | |
194 | ||
195 | static 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 | ||
210 | static 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 | ||
221 | static 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 | ||
235 | static 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 | ||
5298cc4c | 243 | static int max8997_haptic_probe(struct platform_device *pdev) |
104594b0 DK |
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 | ||
342 | err_destroy_ff: | |
343 | input_ff_destroy(input_dev); | |
344 | err_put_regulator: | |
345 | regulator_put(chip->regulator); | |
346 | err_free_pwm: | |
347 | if (chip->mode == MAX8997_EXTERNAL_MODE) | |
348 | pwm_free(chip->pwm); | |
349 | err_free_mem: | |
350 | input_free_device(input_dev); | |
351 | kfree(chip); | |
352 | ||
353 | return error; | |
354 | } | |
355 | ||
e2619cf7 | 356 | static int max8997_haptic_remove(struct platform_device *pdev) |
104594b0 DK |
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 | |
372 | static 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 | ||
383 | static SIMPLE_DEV_PM_OPS(max8997_haptic_pm_ops, max8997_haptic_suspend, NULL); | |
384 | ||
385 | static const struct platform_device_id max8997_haptic_id[] = { | |
386 | { "max8997-haptic", 0 }, | |
387 | { }, | |
388 | }; | |
389 | MODULE_DEVICE_TABLE(i2c, max8997_haptic_id); | |
390 | ||
391 | static 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, | |
1cb0aa88 | 398 | .remove = max8997_haptic_remove, |
104594b0 DK |
399 | .id_table = max8997_haptic_id, |
400 | }; | |
401 | module_platform_driver(max8997_haptic_driver); | |
402 | ||
403 | MODULE_ALIAS("platform:max8997-haptic"); | |
404 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
405 | MODULE_DESCRIPTION("max8997_haptic driver"); | |
406 | MODULE_LICENSE("GPL"); |