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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 
 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         if (info->weak_speed || info->strong_speed) {
194                 if (!info->enabled)
195                         twl6040_vibra_enable(info);
196 
197                 twl6040_vibra_set_effect(info);
198         } else if (info->enabled)
199                 twl6040_vibra_disable(info);
200 
201 }
202 
203 static int vibra_play(struct input_dev *input, void *data,
204                       struct ff_effect *effect)
205 {
206         struct vibra_info *info = input_get_drvdata(input);
207 
208         info->weak_speed = effect->u.rumble.weak_magnitude;
209         info->strong_speed = effect->u.rumble.strong_magnitude;
210         info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
211 
212         schedule_work(&info->play_work);
213 
214         return 0;
215 }
216 
217 static void twl6040_vibra_close(struct input_dev *input)
218 {
219         struct vibra_info *info = input_get_drvdata(input);
220 
221         cancel_work_sync(&info->play_work);
222 
223         if (info->enabled)
224                 twl6040_vibra_disable(info);
225 }
226 
227 static int __maybe_unused twl6040_vibra_suspend(struct device *dev)
228 {
229         struct platform_device *pdev = to_platform_device(dev);
230         struct vibra_info *info = platform_get_drvdata(pdev);
231 
232         cancel_work_sync(&info->play_work);
233 
234         if (info->enabled)
235                 twl6040_vibra_disable(info);
236 
237         return 0;
238 }
239 
240 static SIMPLE_DEV_PM_OPS(twl6040_vibra_pm_ops, twl6040_vibra_suspend, NULL);
241 
242 static int twl6040_vibra_probe(struct platform_device *pdev)
243 {
244         struct device *twl6040_core_dev = pdev->dev.parent;
245         struct device_node *twl6040_core_node;
246         struct vibra_info *info;
247         int vddvibl_uV = 0;
248         int vddvibr_uV = 0;
249         int error;
250 
251         of_node_get(twl6040_core_dev->of_node);
252         twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
253                                                  "vibra");
254         if (!twl6040_core_node) {
255                 dev_err(&pdev->dev, "parent of node is missing?\n");
256                 return -EINVAL;
257         }
258 
259         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
260         if (!info) {
261                 of_node_put(twl6040_core_node);
262                 dev_err(&pdev->dev, "couldn't allocate memory\n");
263                 return -ENOMEM;
264         }
265 
266         info->dev = &pdev->dev;
267 
268         info->twl6040 = dev_get_drvdata(pdev->dev.parent);
269 
270         of_property_read_u32(twl6040_core_node, "ti,vibldrv-res",
271                              &info->vibldrv_res);
272         of_property_read_u32(twl6040_core_node, "ti,vibrdrv-res",
273                              &info->vibrdrv_res);
274         of_property_read_u32(twl6040_core_node, "ti,viblmotor-res",
275                              &info->viblmotor_res);
276         of_property_read_u32(twl6040_core_node, "ti,vibrmotor-res",
277                              &info->vibrmotor_res);
278         of_property_read_u32(twl6040_core_node, "ti,vddvibl-uV", &vddvibl_uV);
279         of_property_read_u32(twl6040_core_node, "ti,vddvibr-uV", &vddvibr_uV);
280 
281         of_node_put(twl6040_core_node);
282 
283         if ((!info->vibldrv_res && !info->viblmotor_res) ||
284             (!info->vibrdrv_res && !info->vibrmotor_res)) {
285                 dev_err(info->dev, "invalid vibra driver/motor resistance\n");
286                 return -EINVAL;
287         }
288 
289         info->irq = platform_get_irq(pdev, 0);
290         if (info->irq < 0) {
291                 dev_err(info->dev, "invalid irq\n");
292                 return -EINVAL;
293         }
294 
295         error = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
296                                           twl6040_vib_irq_handler,
297                                           IRQF_ONESHOT,
298                                           "twl6040_irq_vib", info);
299         if (error) {
300                 dev_err(info->dev, "VIB IRQ request failed: %d\n", error);
301                 return error;
302         }
303 
304         info->supplies[0].supply = "vddvibl";
305         info->supplies[1].supply = "vddvibr";
306         /*
307          * When booted with Device tree the regulators are attached to the
308          * parent device (twl6040 MFD core)
309          */
310         error = devm_regulator_bulk_get(twl6040_core_dev,
311                                         ARRAY_SIZE(info->supplies),
312                                         info->supplies);
313         if (error) {
314                 dev_err(info->dev, "couldn't get regulators %d\n", error);
315                 return error;
316         }
317 
318         if (vddvibl_uV) {
319                 error = regulator_set_voltage(info->supplies[0].consumer,
320                                               vddvibl_uV, vddvibl_uV);
321                 if (error) {
322                         dev_err(info->dev, "failed to set VDDVIBL volt %d\n",
323                                 error);
324                         return error;
325                 }
326         }
327 
328         if (vddvibr_uV) {
329                 error = regulator_set_voltage(info->supplies[1].consumer,
330                                               vddvibr_uV, vddvibr_uV);
331                 if (error) {
332                         dev_err(info->dev, "failed to set VDDVIBR volt %d\n",
333                                 error);
334                         return error;
335                 }
336         }
337 
338         INIT_WORK(&info->play_work, vibra_play_work);
339 
340         info->input_dev = devm_input_allocate_device(&pdev->dev);
341         if (!info->input_dev) {
342                 dev_err(info->dev, "couldn't allocate input device\n");
343                 return -ENOMEM;
344         }
345 
346         input_set_drvdata(info->input_dev, info);
347 
348         info->input_dev->name = "twl6040:vibrator";
349         info->input_dev->id.version = 1;
350         info->input_dev->close = twl6040_vibra_close;
351         __set_bit(FF_RUMBLE, info->input_dev->ffbit);
352 
353         error = input_ff_create_memless(info->input_dev, NULL, vibra_play);
354         if (error) {
355                 dev_err(info->dev, "couldn't register vibrator to FF\n");
356                 return error;
357         }
358 
359         error = input_register_device(info->input_dev);
360         if (error) {
361                 dev_err(info->dev, "couldn't register input device\n");
362                 return error;
363         }
364 
365         platform_set_drvdata(pdev, info);
366 
367         return 0;
368 }
369 
370 static struct platform_driver twl6040_vibra_driver = {
371         .probe          = twl6040_vibra_probe,
372         .driver         = {
373                 .name   = "twl6040-vibra",
374                 .pm     = &twl6040_vibra_pm_ops,
375         },
376 };
377 module_platform_driver(twl6040_vibra_driver);
378 
379 MODULE_ALIAS("platform:twl6040-vibra");
380 MODULE_DESCRIPTION("TWL6040 Vibra driver");
381 MODULE_LICENSE("GPL");
382 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
383 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
384 

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