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Linux/drivers/input/misc/twl6040-vibra.c

  1 /*
  2  * twl6040-vibra.c - TWL6040 Vibrator driver
  3  *
  4  * Author:      Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
  5  * Author:      Misael Lopez Cruz <misael.lopez@ti.com>
  6  *
  7  * Copyright:   (C) 2011 Texas Instruments, Inc.
  8  *
  9  * Based on twl4030-vibra.c by Henrik Saari <henrik.saari@nokia.com>
 10  *                              Felipe Balbi <felipe.balbi@nokia.com>
 11  *                              Jari Vanhala <ext-javi.vanhala@nokia.com>
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License version 2 as
 15  * published by the Free Software Foundation.
 16  *
 17  * This program is distributed in the hope that it will be useful, but
 18  * WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 20  * General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 25  * 02110-1301 USA
 26  *
 27  */
 28 #include <linux/module.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/of.h>
 31 #include <linux/workqueue.h>
 32 #include <linux/input.h>
 33 #include <linux/mfd/twl6040.h>
 34 #include <linux/slab.h>
 35 #include <linux/delay.h>
 36 #include <linux/regulator/consumer.h>
 37 
 38 #define EFFECT_DIR_180_DEG      0x8000
 39 
 40 /* Recommended modulation index 85% */
 41 #define TWL6040_VIBRA_MOD       85
 42 
 43 #define TWL6040_NUM_SUPPLIES 2
 44 
 45 struct vibra_info {
 46         struct device *dev;
 47         struct input_dev *input_dev;
 48         struct workqueue_struct *workqueue;
 49         struct work_struct play_work;
 50         struct mutex mutex;
 51         int irq;
 52 
 53         bool enabled;
 54         int weak_speed;
 55         int strong_speed;
 56         int direction;
 57 
 58         unsigned int vibldrv_res;
 59         unsigned int vibrdrv_res;
 60         unsigned int viblmotor_res;
 61         unsigned int vibrmotor_res;
 62 
 63         struct regulator_bulk_data supplies[TWL6040_NUM_SUPPLIES];
 64 
 65         struct twl6040 *twl6040;
 66 };
 67 
 68 static irqreturn_t twl6040_vib_irq_handler(int irq, void *data)
 69 {
 70         struct vibra_info *info = data;
 71         struct twl6040 *twl6040 = info->twl6040;
 72         u8 status;
 73 
 74         status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
 75         if (status & TWL6040_VIBLOCDET) {
 76                 dev_warn(info->dev, "Left Vibrator overcurrent detected\n");
 77                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLL,
 78                                    TWL6040_VIBENA);
 79         }
 80         if (status & TWL6040_VIBROCDET) {
 81                 dev_warn(info->dev, "Right Vibrator overcurrent detected\n");
 82                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLR,
 83                                    TWL6040_VIBENA);
 84         }
 85 
 86         return IRQ_HANDLED;
 87 }
 88 
 89 static void twl6040_vibra_enable(struct vibra_info *info)
 90 {
 91         struct twl6040 *twl6040 = info->twl6040;
 92         int ret;
 93 
 94         ret = regulator_bulk_enable(ARRAY_SIZE(info->supplies), info->supplies);
 95         if (ret) {
 96                 dev_err(info->dev, "failed to enable regulators %d\n", ret);
 97                 return;
 98         }
 99 
100         twl6040_power(info->twl6040, 1);
101         if (twl6040_get_revid(twl6040) <= TWL6040_REV_ES1_1) {
102                 /*
103                  * ERRATA: Disable overcurrent protection for at least
104                  * 3ms when enabling vibrator drivers to avoid false
105                  * overcurrent detection
106                  */
107                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
108                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
109                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
110                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
111                 usleep_range(3000, 3500);
112         }
113 
114         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
115                           TWL6040_VIBENA);
116         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
117                           TWL6040_VIBENA);
118 
119         info->enabled = true;
120 }
121 
122 static void twl6040_vibra_disable(struct vibra_info *info)
123 {
124         struct twl6040 *twl6040 = info->twl6040;
125 
126         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 0x00);
127         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 0x00);
128         twl6040_power(info->twl6040, 0);
129 
130         regulator_bulk_disable(ARRAY_SIZE(info->supplies), info->supplies);
131 
132         info->enabled = false;
133 }
134 
135 static u8 twl6040_vibra_code(int vddvib, int vibdrv_res, int motor_res,
136                              int speed, int direction)
137 {
138         int vpk, max_code;
139         u8 vibdat;
140 
141         /* output swing */
142         vpk = (vddvib * motor_res * TWL6040_VIBRA_MOD) /
143                 (100 * (vibdrv_res + motor_res));
144 
145         /* 50mV per VIBDAT code step */
146         max_code = vpk / 50;
147         if (max_code > TWL6040_VIBDAT_MAX)
148                 max_code = TWL6040_VIBDAT_MAX;
149 
150         /* scale speed to max allowed code */
151         vibdat = (u8)((speed * max_code) / USHRT_MAX);
152 
153         /* 2's complement for direction > 180 degrees */
154         vibdat *= direction;
155 
156         return vibdat;
157 }
158 
159 static void twl6040_vibra_set_effect(struct vibra_info *info)
160 {
161         struct twl6040 *twl6040 = info->twl6040;
162         u8 vibdatl, vibdatr;
163         int volt;
164 
165         /* weak motor */
166         volt = regulator_get_voltage(info->supplies[0].consumer) / 1000;
167         vibdatl = twl6040_vibra_code(volt, info->vibldrv_res,
168                                      info->viblmotor_res,
169                                      info->weak_speed, info->direction);
170 
171         /* strong motor */
172         volt = regulator_get_voltage(info->supplies[1].consumer) / 1000;
173         vibdatr = twl6040_vibra_code(volt, info->vibrdrv_res,
174                                      info->vibrmotor_res,
175                                      info->strong_speed, info->direction);
176 
177         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATL, vibdatl);
178         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATR, vibdatr);
179 }
180 
181 static void vibra_play_work(struct work_struct *work)
182 {
183         struct vibra_info *info = container_of(work,
184                                 struct vibra_info, play_work);
185 
186         mutex_lock(&info->mutex);
187 
188         if (info->weak_speed || info->strong_speed) {
189                 if (!info->enabled)
190                         twl6040_vibra_enable(info);
191 
192                 twl6040_vibra_set_effect(info);
193         } else if (info->enabled)
194                 twl6040_vibra_disable(info);
195 
196         mutex_unlock(&info->mutex);
197 }
198 
199 static int vibra_play(struct input_dev *input, void *data,
200                       struct ff_effect *effect)
201 {
202         struct vibra_info *info = input_get_drvdata(input);
203         int ret;
204 
205         /* Do not allow effect, while the routing is set to use audio */
206         ret = twl6040_get_vibralr_status(info->twl6040);
207         if (ret & TWL6040_VIBSEL) {
208                 dev_info(&input->dev, "Vibra is configured for audio\n");
209                 return -EBUSY;
210         }
211 
212         info->weak_speed = effect->u.rumble.weak_magnitude;
213         info->strong_speed = effect->u.rumble.strong_magnitude;
214         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
215 
216         ret = queue_work(info->workqueue, &info->play_work);
217         if (!ret) {
218                 dev_info(&input->dev, "work is already on queue\n");
219                 return ret;
220         }
221 
222         return 0;
223 }
224 
225 static void twl6040_vibra_close(struct input_dev *input)
226 {
227         struct vibra_info *info = input_get_drvdata(input);
228 
229         cancel_work_sync(&info->play_work);
230 
231         mutex_lock(&info->mutex);
232 
233         if (info->enabled)
234                 twl6040_vibra_disable(info);
235 
236         mutex_unlock(&info->mutex);
237 }
238 
239 #ifdef CONFIG_PM_SLEEP
240 static int twl6040_vibra_suspend(struct device *dev)
241 {
242         struct platform_device *pdev = to_platform_device(dev);
243         struct vibra_info *info = platform_get_drvdata(pdev);
244 
245         mutex_lock(&info->mutex);
246 
247         if (info->enabled)
248                 twl6040_vibra_disable(info);
249 
250         mutex_unlock(&info->mutex);
251 
252         return 0;
253 }
254 #endif
255 
256 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
257 
258 static int twl6040_vibra_probe(struct platform_device *pdev)
259 {
260         struct device *twl6040_core_dev = pdev->dev.parent;
261         struct device_node *twl6040_core_node;
262         struct vibra_info *info;
263         int vddvibl_uV = 0;
264         int vddvibr_uV = 0;
265         int error;
266 
267         twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
268                                                  "vibra");
269         if (!twl6040_core_node) {
270                 dev_err(&pdev->dev, "parent of node is missing?\n");
271                 return -EINVAL;
272         }
273 
274         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
275         if (!info) {
276                 of_node_put(twl6040_core_node);
277                 dev_err(&pdev->dev, "couldn't allocate memory\n");
278                 return -ENOMEM;
279         }
280 
281         info->dev = &pdev->dev;
282 
283         info->twl6040 = dev_get_drvdata(pdev->dev.parent);
284 
285         of_property_read_u32(twl6040_core_node, "ti,vibldrv-res",
286                              &info->vibldrv_res);
287         of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res",
288                              &info->vibrdrv_res);
289         of_property_read_u32(twl6040_core_node, "ti,viblmotor-res",
290                              &info->viblmotor_res);
291         of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res",
292                              &info->vibrmotor_res);
293         of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV", &vddvibl_uV);
294         of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV", &vddvibr_uV);
295 
296         of_node_put(twl6040_core_node);
297 
298         if ((!info->vibldrv_res && !info->viblmotor_res) ||
299             (!info->vibrdrv_res && !info->vibrmotor_res)) {
300                 dev_err(info->dev, "invalid vibra driver/motor resistance\n");
301                 return -EINVAL;
302         }
303 
304         info->irq = platform_get_irq(pdev, 0);
305         if (info->irq < 0) {
306                 dev_err(info->dev, "invalid irq\n");
307                 return -EINVAL;
308         }
309 
310         mutex_init(&info->mutex);
311 
312         error = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
313                                           twl6040_vib_irq_handler, 0,
314                                           "twl6040_irq_vib", info);
315         if (error) {
316                 dev_err(info->dev, "VIB IRQ request failed: %d\n", error);
317                 return error;
318         }
319 
320         info->supplies[0].supply = "vddvibl";
321         info->supplies[1].supply = "vddvibr";
322         /*
323          * When booted with Device tree the regulators are attached to the
324          * parent device (twl6040 MFD core)
325          */
326         error = devm_regulator_bulk_get(twl6040_core_dev,
327                                         ARRAY_SIZE(info->supplies),
328                                         info->supplies);
329         if (error) {
330                 dev_err(info->dev, "couldn't get regulators %d\n", error);
331                 return error;
332         }
333 
334         if (vddvibl_uV) {
335                 error = regulator_set_voltage(info->supplies[0].consumer,
336                                               vddvibl_uV, vddvibl_uV);
337                 if (error) {
338                         dev_err(info->dev, "failed to set VDDVIBL volt %d\n",
339                                 error);
340                         return error;
341                 }
342         }
343 
344         if (vddvibr_uV) {
345                 error = regulator_set_voltage(info->supplies[1].consumer,
346                                               vddvibr_uV, vddvibr_uV);
347                 if (error) {
348                         dev_err(info->dev, "failed to set VDDVIBR volt %d\n",
349                                 error);
350                         return error;
351                 }
352         }
353 
354         INIT_WORK(&info->play_work, vibra_play_work);
355 
356         info->input_dev = devm_input_allocate_device(&pdev->dev);
357         if (!info->input_dev) {
358                 dev_err(info->dev, "couldn't allocate input device\n");
359                 return -ENOMEM;
360         }
361 
362         input_set_drvdata(info->input_dev, info);
363 
364         info->input_dev->name = "twl6040:vibrator";
365         info->input_dev->id.version = 1;
366         info->input_dev->dev.parent = pdev->dev.parent;
367         info->input_dev->close = twl6040_vibra_close;
368         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
369 
370         error = input_ff_create_memless(info->input_dev, NULL, vibra_play);
371         if (error) {
372                 dev_err(info->dev, "couldn't register vibrator to FF\n");
373                 return error;
374         }
375 
376         error = input_register_device(info->input_dev);
377         if (error) {
378                 dev_err(info->dev, "couldn't register input device\n");
379                 return error;
380         }
381 
382         platform_set_drvdata(pdev, info);
383 
384         return 0;
385 }
386 
387 static struct platform_driver twl6040_vibra_driver = {
388         .probe          = twl6040_vibra_probe,
389         .driver         = {
390                 .name   = "twl6040-vibra",
391                 .owner  = THIS_MODULE,
392                 .pm     = &twl6040_vibra_pm_ops,
393         },
394 };
395 module_platform_driver(twl6040_vibra_driver);
396 
397 MODULE_ALIAS("platform:twl6040-vibra");
398 MODULE_DESCRIPTION("TWL6040 Vibra driver");
399 MODULE_LICENSE("GPL");
400 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
401 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
402 

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