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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 work_struct play_work;
 49         struct mutex mutex;
 50         int irq;
 51 
 52         bool enabled;
 53         int weak_speed;
 54         int strong_speed;
 55         int direction;
 56 
 57         unsigned int vibldrv_res;
 58         unsigned int vibrdrv_res;
 59         unsigned int viblmotor_res;
 60         unsigned int vibrmotor_res;
 61 
 62         struct regulator_bulk_data supplies[TWL6040_NUM_SUPPLIES];
 63 
 64         struct twl6040 *twl6040;
 65 };
 66 
 67 static irqreturn_t twl6040_vib_irq_handler(int irq, void *data)
 68 {
 69         struct vibra_info *info = data;
 70         struct twl6040 *twl6040 = info->twl6040;
 71         u8 status;
 72 
 73         status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
 74         if (status & TWL6040_VIBLOCDET) {
 75                 dev_warn(info->dev, "Left Vibrator overcurrent detected\n");
 76                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLL,
 77                                    TWL6040_VIBENA);
 78         }
 79         if (status & TWL6040_VIBROCDET) {
 80                 dev_warn(info->dev, "Right Vibrator overcurrent detected\n");
 81                 twl6040_clear_bits(twl6040, TWL6040_REG_VIBCTLR,
 82                                    TWL6040_VIBENA);
 83         }
 84 
 85         return IRQ_HANDLED;
 86 }
 87 
 88 static void twl6040_vibra_enable(struct vibra_info *info)
 89 {
 90         struct twl6040 *twl6040 = info->twl6040;
 91         int ret;
 92 
 93         ret = regulator_bulk_enable(ARRAY_SIZE(info->supplies), info->supplies);
 94         if (ret) {
 95                 dev_err(info->dev, "failed to enable regulators %d\n", ret);
 96                 return;
 97         }
 98 
 99         twl6040_power(info->twl6040, 1);
100         if (twl6040_get_revid(twl6040) <= TWL6040_REV_ES1_1) {
101                 /*
102                  * ERRATA: Disable overcurrent protection for at least
103                  * 3ms when enabling vibrator drivers to avoid false
104                  * overcurrent detection
105                  */
106                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
107                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
108                 twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
109                                   TWL6040_VIBENA | TWL6040_VIBCTRL);
110                 usleep_range(3000, 3500);
111         }
112 
113         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL,
114                           TWL6040_VIBENA);
115         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR,
116                           TWL6040_VIBENA);
117 
118         info->enabled = true;
119 }
120 
121 static void twl6040_vibra_disable(struct vibra_info *info)
122 {
123         struct twl6040 *twl6040 = info->twl6040;
124 
125         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLL, 0x00);
126         twl6040_reg_write(twl6040, TWL6040_REG_VIBCTLR, 0x00);
127         twl6040_power(info->twl6040, 0);
128 
129         regulator_bulk_disable(ARRAY_SIZE(info->supplies), info->supplies);
130 
131         info->enabled = false;
132 }
133 
134 static u8 twl6040_vibra_code(int vddvib, int vibdrv_res, int motor_res,
135                              int speed, int direction)
136 {
137         int vpk, max_code;
138         u8 vibdat;
139 
140         /* output swing */
141         vpk = (vddvib * motor_res * TWL6040_VIBRA_MOD) /
142                 (100 * (vibdrv_res + motor_res));
143 
144         /* 50mV per VIBDAT code step */
145         max_code = vpk / 50;
146         if (max_code > TWL6040_VIBDAT_MAX)
147                 max_code = TWL6040_VIBDAT_MAX;
148 
149         /* scale speed to max allowed code */
150         vibdat = (u8)((speed * max_code) / USHRT_MAX);
151 
152         /* 2's complement for direction > 180 degrees */
153         vibdat *= direction;
154 
155         return vibdat;
156 }
157 
158 static void twl6040_vibra_set_effect(struct vibra_info *info)
159 {
160         struct twl6040 *twl6040 = info->twl6040;
161         u8 vibdatl, vibdatr;
162         int volt;
163 
164         /* weak motor */
165         volt = regulator_get_voltage(info->supplies[0].consumer) / 1000;
166         vibdatl = twl6040_vibra_code(volt, info->vibldrv_res,
167                                      info->viblmotor_res,
168                                      info->weak_speed, info->direction);
169 
170         /* strong motor */
171         volt = regulator_get_voltage(info->supplies[1].consumer) / 1000;
172         vibdatr = twl6040_vibra_code(volt, info->vibrdrv_res,
173                                      info->vibrmotor_res,
174                                      info->strong_speed, info->direction);
175 
176         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATL, vibdatl);
177         twl6040_reg_write(twl6040, TWL6040_REG_VIBDATR, vibdatr);
178 }
179 
180 static void vibra_play_work(struct work_struct *work)
181 {
182         struct vibra_info *info = container_of(work,
183                                 struct vibra_info, play_work);
184         int ret;
185 
186         /* Do not allow effect, while the routing is set to use audio */
187         ret = twl6040_get_vibralr_status(info->twl6040);
188         if (ret & TWL6040_VIBSEL) {
189                 dev_info(info->dev, "Vibra is configured for audio\n");
190                 return;
191         }
192 
193         mutex_lock(&info->mutex);
194 
195         if (info->weak_speed || info->strong_speed) {
196                 if (!info->enabled)
197                         twl6040_vibra_enable(info);
198 
199                 twl6040_vibra_set_effect(info);
200         } else if (info->enabled)
201                 twl6040_vibra_disable(info);
202 
203         mutex_unlock(&info->mutex);
204 }
205 
206 static int vibra_play(struct input_dev *input, void *data,
207                       struct ff_effect *effect)
208 {
209         struct vibra_info *info = input_get_drvdata(input);
210 
211         info->weak_speed = effect->u.rumble.weak_magnitude;
212         info->strong_speed = effect->u.rumble.strong_magnitude;
213         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
214 
215         schedule_work(&info->play_work);
216 
217         return 0;
218 }
219 
220 static void twl6040_vibra_close(struct input_dev *input)
221 {
222         struct vibra_info *info = input_get_drvdata(input);
223 
224         cancel_work_sync(&info->play_work);
225 
226         mutex_lock(&info->mutex);
227 
228         if (info->enabled)
229                 twl6040_vibra_disable(info);
230 
231         mutex_unlock(&info->mutex);
232 }
233 
234 static int __maybe_unused twl6040_vibra_suspend(struct device *dev)
235 {
236         struct platform_device *pdev = to_platform_device(dev);
237         struct vibra_info *info = platform_get_drvdata(pdev);
238 
239         mutex_lock(&info->mutex);
240 
241         if (info->enabled)
242                 twl6040_vibra_disable(info);
243 
244         mutex_unlock(&info->mutex);
245 
246         return 0;
247 }
248 
249 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
250 
251 static int twl6040_vibra_probe(struct platform_device *pdev)
252 {
253         struct device *twl6040_core_dev = pdev->dev.parent;
254         struct device_node *twl6040_core_node;
255         struct vibra_info *info;
256         int vddvibl_uV = 0;
257         int vddvibr_uV = 0;
258         int error;
259 
260         of_node_get(twl6040_core_dev->of_node);
261         twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
262                                                  "vibra");
263         if (!twl6040_core_node) {
264                 dev_err(&pdev->dev, "parent of node is missing?\n");
265                 return -EINVAL;
266         }
267 
268         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
269         if (!info) {
270                 of_node_put(twl6040_core_node);
271                 dev_err(&pdev->dev, "couldn't allocate memory\n");
272                 return -ENOMEM;
273         }
274 
275         info->dev = &pdev->dev;
276 
277         info->twl6040 = dev_get_drvdata(pdev->dev.parent);
278 
279         of_property_read_u32(twl6040_core_node, "ti,vibldrv-res",
280                              &info->vibldrv_res);
281         of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res",
282                              &info->vibrdrv_res);
283         of_property_read_u32(twl6040_core_node, "ti,viblmotor-res",
284                              &info->viblmotor_res);
285         of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res",
286                              &info->vibrmotor_res);
287         of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV", &vddvibl_uV);
288         of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV", &vddvibr_uV);
289 
290         of_node_put(twl6040_core_node);
291 
292         if ((!info->vibldrv_res && !info->viblmotor_res) ||
293             (!info->vibrdrv_res && !info->vibrmotor_res)) {
294                 dev_err(info->dev, "invalid vibra driver/motor resistance\n");
295                 return -EINVAL;
296         }
297 
298         info->irq = platform_get_irq(pdev, 0);
299         if (info->irq < 0) {
300                 dev_err(info->dev, "invalid irq\n");
301                 return -EINVAL;
302         }
303 
304         mutex_init(&info->mutex);
305 
306         error = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
307                                           twl6040_vib_irq_handler,
308                                           IRQF_ONESHOT,
309                                           "twl6040_irq_vib", info);
310         if (error) {
311                 dev_err(info->dev, "VIB IRQ request failed: %d\n", error);
312                 return error;
313         }
314 
315         info->supplies[0].supply = "vddvibl";
316         info->supplies[1].supply = "vddvibr";
317         /*
318          * When booted with Device tree the regulators are attached to the
319          * parent device (twl6040 MFD core)
320          */
321         error = devm_regulator_bulk_get(twl6040_core_dev,
322                                         ARRAY_SIZE(info->supplies),
323                                         info->supplies);
324         if (error) {
325                 dev_err(info->dev, "couldn't get regulators %d\n", error);
326                 return error;
327         }
328 
329         if (vddvibl_uV) {
330                 error = regulator_set_voltage(info->supplies[0].consumer,
331                                               vddvibl_uV, vddvibl_uV);
332                 if (error) {
333                         dev_err(info->dev, "failed to set VDDVIBL volt %d\n",
334                                 error);
335                         return error;
336                 }
337         }
338 
339         if (vddvibr_uV) {
340                 error = regulator_set_voltage(info->supplies[1].consumer,
341                                               vddvibr_uV, vddvibr_uV);
342                 if (error) {
343                         dev_err(info->dev, "failed to set VDDVIBR volt %d\n",
344                                 error);
345                         return error;
346                 }
347         }
348 
349         INIT_WORK(&info->play_work, vibra_play_work);
350 
351         info->input_dev = devm_input_allocate_device(&pdev->dev);
352         if (!info->input_dev) {
353                 dev_err(info->dev, "couldn't allocate input device\n");
354                 return -ENOMEM;
355         }
356 
357         input_set_drvdata(info->input_dev, info);
358 
359         info->input_dev->name = "twl6040:vibrator";
360         info->input_dev->id.version = 1;
361         info->input_dev->close = twl6040_vibra_close;
362         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
363 
364         error = input_ff_create_memless(info->input_dev, NULL, vibra_play);
365         if (error) {
366                 dev_err(info->dev, "couldn't register vibrator to FF\n");
367                 return error;
368         }
369 
370         error = input_register_device(info->input_dev);
371         if (error) {
372                 dev_err(info->dev, "couldn't register input device\n");
373                 return error;
374         }
375 
376         platform_set_drvdata(pdev, info);
377 
378         return 0;
379 }
380 
381 static struct platform_driver twl6040_vibra_driver = {
382         .probe          = twl6040_vibra_probe,
383         .driver         = {
384                 .name   = "twl6040-vibra",
385                 .pm     = &twl6040_vibra_pm_ops,
386         },
387 };
388 module_platform_driver(twl6040_vibra_driver);
389 
390 MODULE_ALIAS("platform:twl6040-vibra");
391 MODULE_DESCRIPTION("TWL6040 Vibra driver");
392 MODULE_LICENSE("GPL");
393 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
394 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
395 

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