Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/input/touchscreen/mms114.c

  1 /*
  2  * Copyright (C) 2012 Samsung Electronics Co.Ltd
  3  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/delay.h>
 12 #include <linux/of.h>
 13 #include <linux/i2c.h>
 14 #include <linux/i2c/mms114.h>
 15 #include <linux/input/mt.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/regulator/consumer.h>
 18 #include <linux/slab.h>
 19 
 20 /* Write only registers */
 21 #define MMS114_MODE_CONTROL             0x01
 22 #define MMS114_OPERATION_MODE_MASK      0xE
 23 #define MMS114_ACTIVE                   (1 << 1)
 24 
 25 #define MMS114_XY_RESOLUTION_H          0x02
 26 #define MMS114_X_RESOLUTION             0x03
 27 #define MMS114_Y_RESOLUTION             0x04
 28 #define MMS114_CONTACT_THRESHOLD        0x05
 29 #define MMS114_MOVING_THRESHOLD         0x06
 30 
 31 /* Read only registers */
 32 #define MMS114_PACKET_SIZE              0x0F
 33 #define MMS114_INFOMATION               0x10
 34 #define MMS114_TSP_REV                  0xF0
 35 
 36 /* Minimum delay time is 50us between stop and start signal of i2c */
 37 #define MMS114_I2C_DELAY                50
 38 
 39 /* 200ms needs after power on */
 40 #define MMS114_POWERON_DELAY            200
 41 
 42 /* Touchscreen absolute values */
 43 #define MMS114_MAX_AREA                 0xff
 44 
 45 #define MMS114_MAX_TOUCH                10
 46 #define MMS114_PACKET_NUM               8
 47 
 48 /* Touch type */
 49 #define MMS114_TYPE_NONE                0
 50 #define MMS114_TYPE_TOUCHSCREEN         1
 51 #define MMS114_TYPE_TOUCHKEY            2
 52 
 53 struct mms114_data {
 54         struct i2c_client       *client;
 55         struct input_dev        *input_dev;
 56         struct regulator        *core_reg;
 57         struct regulator        *io_reg;
 58         const struct mms114_platform_data       *pdata;
 59 
 60         /* Use cache data for mode control register(write only) */
 61         u8                      cache_mode_control;
 62 };
 63 
 64 struct mms114_touch {
 65         u8 id:4, reserved_bit4:1, type:2, pressed:1;
 66         u8 x_hi:4, y_hi:4;
 67         u8 x_lo;
 68         u8 y_lo;
 69         u8 width;
 70         u8 strength;
 71         u8 reserved[2];
 72 } __packed;
 73 
 74 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
 75                              unsigned int len, u8 *val)
 76 {
 77         struct i2c_client *client = data->client;
 78         struct i2c_msg xfer[2];
 79         u8 buf = reg & 0xff;
 80         int error;
 81 
 82         if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
 83                 BUG();
 84 
 85         /* Write register: use repeated start */
 86         xfer[0].addr = client->addr;
 87         xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART;
 88         xfer[0].len = 1;
 89         xfer[0].buf = &buf;
 90 
 91         /* Read data */
 92         xfer[1].addr = client->addr;
 93         xfer[1].flags = I2C_M_RD;
 94         xfer[1].len = len;
 95         xfer[1].buf = val;
 96 
 97         error = i2c_transfer(client->adapter, xfer, 2);
 98         if (error != 2) {
 99                 dev_err(&client->dev,
100                         "%s: i2c transfer failed (%d)\n", __func__, error);
101                 return error < 0 ? error : -EIO;
102         }
103         udelay(MMS114_I2C_DELAY);
104 
105         return 0;
106 }
107 
108 static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
109 {
110         u8 val;
111         int error;
112 
113         if (reg == MMS114_MODE_CONTROL)
114                 return data->cache_mode_control;
115 
116         error = __mms114_read_reg(data, reg, 1, &val);
117         return error < 0 ? error : val;
118 }
119 
120 static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
121                             unsigned int val)
122 {
123         struct i2c_client *client = data->client;
124         u8 buf[2];
125         int error;
126 
127         buf[0] = reg & 0xff;
128         buf[1] = val & 0xff;
129 
130         error = i2c_master_send(client, buf, 2);
131         if (error != 2) {
132                 dev_err(&client->dev,
133                         "%s: i2c send failed (%d)\n", __func__, error);
134                 return error < 0 ? error : -EIO;
135         }
136         udelay(MMS114_I2C_DELAY);
137 
138         if (reg == MMS114_MODE_CONTROL)
139                 data->cache_mode_control = val;
140 
141         return 0;
142 }
143 
144 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
145 {
146         const struct mms114_platform_data *pdata = data->pdata;
147         struct i2c_client *client = data->client;
148         struct input_dev *input_dev = data->input_dev;
149         unsigned int id;
150         unsigned int x;
151         unsigned int y;
152 
153         if (touch->id > MMS114_MAX_TOUCH) {
154                 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id);
155                 return;
156         }
157 
158         if (touch->type != MMS114_TYPE_TOUCHSCREEN) {
159                 dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type);
160                 return;
161         }
162 
163         id = touch->id - 1;
164         x = touch->x_lo | touch->x_hi << 8;
165         y = touch->y_lo | touch->y_hi << 8;
166         if (x > pdata->x_size || y > pdata->y_size) {
167                 dev_dbg(&client->dev,
168                         "Wrong touch coordinates (%d, %d)\n", x, y);
169                 return;
170         }
171 
172         if (pdata->x_invert)
173                 x = pdata->x_size - x;
174         if (pdata->y_invert)
175                 y = pdata->y_size - y;
176 
177         dev_dbg(&client->dev,
178                 "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n",
179                 id, touch->type, touch->pressed,
180                 x, y, touch->width, touch->strength);
181 
182         input_mt_slot(input_dev, id);
183         input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed);
184 
185         if (touch->pressed) {
186                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width);
187                 input_report_abs(input_dev, ABS_MT_POSITION_X, x);
188                 input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
189                 input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength);
190         }
191 }
192 
193 static irqreturn_t mms114_interrupt(int irq, void *dev_id)
194 {
195         struct mms114_data *data = dev_id;
196         struct input_dev *input_dev = data->input_dev;
197         struct mms114_touch touch[MMS114_MAX_TOUCH];
198         int packet_size;
199         int touch_size;
200         int index;
201         int error;
202 
203         mutex_lock(&input_dev->mutex);
204         if (!input_dev->users) {
205                 mutex_unlock(&input_dev->mutex);
206                 goto out;
207         }
208         mutex_unlock(&input_dev->mutex);
209 
210         packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE);
211         if (packet_size <= 0)
212                 goto out;
213 
214         touch_size = packet_size / MMS114_PACKET_NUM;
215 
216         error = __mms114_read_reg(data, MMS114_INFOMATION, packet_size,
217                         (u8 *)touch);
218         if (error < 0)
219                 goto out;
220 
221         for (index = 0; index < touch_size; index++)
222                 mms114_process_mt(data, touch + index);
223 
224         input_mt_report_pointer_emulation(data->input_dev, true);
225         input_sync(data->input_dev);
226 
227 out:
228         return IRQ_HANDLED;
229 }
230 
231 static int mms114_set_active(struct mms114_data *data, bool active)
232 {
233         int val;
234 
235         val = mms114_read_reg(data, MMS114_MODE_CONTROL);
236         if (val < 0)
237                 return val;
238 
239         val &= ~MMS114_OPERATION_MODE_MASK;
240 
241         /* If active is false, sleep mode */
242         if (active)
243                 val |= MMS114_ACTIVE;
244 
245         return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
246 }
247 
248 static int mms114_get_version(struct mms114_data *data)
249 {
250         struct device *dev = &data->client->dev;
251         u8 buf[6];
252         int error;
253 
254         error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
255         if (error < 0)
256                 return error;
257 
258         dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
259                  buf[0], buf[1], buf[3]);
260 
261         return 0;
262 }
263 
264 static int mms114_setup_regs(struct mms114_data *data)
265 {
266         const struct mms114_platform_data *pdata = data->pdata;
267         int val;
268         int error;
269 
270         error = mms114_get_version(data);
271         if (error < 0)
272                 return error;
273 
274         error = mms114_set_active(data, true);
275         if (error < 0)
276                 return error;
277 
278         val = (pdata->x_size >> 8) & 0xf;
279         val |= ((pdata->y_size >> 8) & 0xf) << 4;
280         error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val);
281         if (error < 0)
282                 return error;
283 
284         val = pdata->x_size & 0xff;
285         error = mms114_write_reg(data, MMS114_X_RESOLUTION, val);
286         if (error < 0)
287                 return error;
288 
289         val = pdata->y_size & 0xff;
290         error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val);
291         if (error < 0)
292                 return error;
293 
294         if (pdata->contact_threshold) {
295                 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD,
296                                 pdata->contact_threshold);
297                 if (error < 0)
298                         return error;
299         }
300 
301         if (pdata->moving_threshold) {
302                 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD,
303                                 pdata->moving_threshold);
304                 if (error < 0)
305                         return error;
306         }
307 
308         return 0;
309 }
310 
311 static int mms114_start(struct mms114_data *data)
312 {
313         struct i2c_client *client = data->client;
314         int error;
315 
316         error = regulator_enable(data->core_reg);
317         if (error) {
318                 dev_err(&client->dev, "Failed to enable avdd: %d\n", error);
319                 return error;
320         }
321 
322         error = regulator_enable(data->io_reg);
323         if (error) {
324                 dev_err(&client->dev, "Failed to enable vdd: %d\n", error);
325                 regulator_disable(data->core_reg);
326                 return error;
327         }
328 
329         mdelay(MMS114_POWERON_DELAY);
330 
331         error = mms114_setup_regs(data);
332         if (error < 0) {
333                 regulator_disable(data->io_reg);
334                 regulator_disable(data->core_reg);
335                 return error;
336         }
337 
338         if (data->pdata->cfg_pin)
339                 data->pdata->cfg_pin(true);
340 
341         enable_irq(client->irq);
342 
343         return 0;
344 }
345 
346 static void mms114_stop(struct mms114_data *data)
347 {
348         struct i2c_client *client = data->client;
349         int error;
350 
351         disable_irq(client->irq);
352 
353         if (data->pdata->cfg_pin)
354                 data->pdata->cfg_pin(false);
355 
356         error = regulator_disable(data->io_reg);
357         if (error)
358                 dev_warn(&client->dev, "Failed to disable vdd: %d\n", error);
359 
360         error = regulator_disable(data->core_reg);
361         if (error)
362                 dev_warn(&client->dev, "Failed to disable avdd: %d\n", error);
363 }
364 
365 static int mms114_input_open(struct input_dev *dev)
366 {
367         struct mms114_data *data = input_get_drvdata(dev);
368 
369         return mms114_start(data);
370 }
371 
372 static void mms114_input_close(struct input_dev *dev)
373 {
374         struct mms114_data *data = input_get_drvdata(dev);
375 
376         mms114_stop(data);
377 }
378 
379 #ifdef CONFIG_OF
380 static struct mms114_platform_data *mms114_parse_dt(struct device *dev)
381 {
382         struct mms114_platform_data *pdata;
383         struct device_node *np = dev->of_node;
384 
385         if (!np)
386                 return NULL;
387 
388         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
389         if (!pdata) {
390                 dev_err(dev, "failed to allocate platform data\n");
391                 return NULL;
392         }
393 
394         if (of_property_read_u32(np, "x-size", &pdata->x_size)) {
395                 dev_err(dev, "failed to get x-size property\n");
396                 return NULL;
397         };
398 
399         if (of_property_read_u32(np, "y-size", &pdata->y_size)) {
400                 dev_err(dev, "failed to get y-size property\n");
401                 return NULL;
402         };
403 
404         of_property_read_u32(np, "contact-threshold",
405                                 &pdata->contact_threshold);
406         of_property_read_u32(np, "moving-threshold",
407                                 &pdata->moving_threshold);
408 
409         if (of_find_property(np, "x-invert", NULL))
410                 pdata->x_invert = true;
411         if (of_find_property(np, "y-invert", NULL))
412                 pdata->y_invert = true;
413 
414         return pdata;
415 }
416 #else
417 static inline struct mms114_platform_data *mms114_parse_dt(struct device *dev)
418 {
419         return NULL;
420 }
421 #endif
422 
423 static int mms114_probe(struct i2c_client *client,
424                                   const struct i2c_device_id *id)
425 {
426         const struct mms114_platform_data *pdata;
427         struct mms114_data *data;
428         struct input_dev *input_dev;
429         int error;
430 
431         pdata = dev_get_platdata(&client->dev);
432         if (!pdata)
433                 pdata = mms114_parse_dt(&client->dev);
434 
435         if (!pdata) {
436                 dev_err(&client->dev, "Need platform data\n");
437                 return -EINVAL;
438         }
439 
440         if (!i2c_check_functionality(client->adapter,
441                                 I2C_FUNC_PROTOCOL_MANGLING)) {
442                 dev_err(&client->dev,
443                         "Need i2c bus that supports protocol mangling\n");
444                 return -ENODEV;
445         }
446 
447         data = devm_kzalloc(&client->dev, sizeof(struct mms114_data),
448                             GFP_KERNEL);
449         input_dev = devm_input_allocate_device(&client->dev);
450         if (!data || !input_dev) {
451                 dev_err(&client->dev, "Failed to allocate memory\n");
452                 return -ENOMEM;
453         }
454 
455         data->client = client;
456         data->input_dev = input_dev;
457         data->pdata = pdata;
458 
459         input_dev->name = "MELPAS MMS114 Touchscreen";
460         input_dev->id.bustype = BUS_I2C;
461         input_dev->dev.parent = &client->dev;
462         input_dev->open = mms114_input_open;
463         input_dev->close = mms114_input_close;
464 
465         __set_bit(EV_ABS, input_dev->evbit);
466         __set_bit(EV_KEY, input_dev->evbit);
467         __set_bit(BTN_TOUCH, input_dev->keybit);
468         input_set_abs_params(input_dev, ABS_X, 0, data->pdata->x_size, 0, 0);
469         input_set_abs_params(input_dev, ABS_Y, 0, data->pdata->y_size, 0, 0);
470 
471         /* For multi touch */
472         input_mt_init_slots(input_dev, MMS114_MAX_TOUCH, 0);
473         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
474                              0, MMS114_MAX_AREA, 0, 0);
475         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
476                              0, data->pdata->x_size, 0, 0);
477         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
478                              0, data->pdata->y_size, 0, 0);
479         input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
480 
481         input_set_drvdata(input_dev, data);
482         i2c_set_clientdata(client, data);
483 
484         data->core_reg = devm_regulator_get(&client->dev, "avdd");
485         if (IS_ERR(data->core_reg)) {
486                 error = PTR_ERR(data->core_reg);
487                 dev_err(&client->dev,
488                         "Unable to get the Core regulator (%d)\n", error);
489                 return error;
490         }
491 
492         data->io_reg = devm_regulator_get(&client->dev, "vdd");
493         if (IS_ERR(data->io_reg)) {
494                 error = PTR_ERR(data->io_reg);
495                 dev_err(&client->dev,
496                         "Unable to get the IO regulator (%d)\n", error);
497                 return error;
498         }
499 
500         error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
501                         mms114_interrupt, IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
502                         dev_name(&client->dev), data);
503         if (error) {
504                 dev_err(&client->dev, "Failed to register interrupt\n");
505                 return error;
506         }
507         disable_irq(client->irq);
508 
509         error = input_register_device(data->input_dev);
510         if (error) {
511                 dev_err(&client->dev, "Failed to register input device\n");
512                 return error;
513         }
514 
515         return 0;
516 }
517 
518 #ifdef CONFIG_PM_SLEEP
519 static int mms114_suspend(struct device *dev)
520 {
521         struct i2c_client *client = to_i2c_client(dev);
522         struct mms114_data *data = i2c_get_clientdata(client);
523         struct input_dev *input_dev = data->input_dev;
524         int id;
525 
526         /* Release all touch */
527         for (id = 0; id < MMS114_MAX_TOUCH; id++) {
528                 input_mt_slot(input_dev, id);
529                 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
530         }
531 
532         input_mt_report_pointer_emulation(input_dev, true);
533         input_sync(input_dev);
534 
535         mutex_lock(&input_dev->mutex);
536         if (input_dev->users)
537                 mms114_stop(data);
538         mutex_unlock(&input_dev->mutex);
539 
540         return 0;
541 }
542 
543 static int mms114_resume(struct device *dev)
544 {
545         struct i2c_client *client = to_i2c_client(dev);
546         struct mms114_data *data = i2c_get_clientdata(client);
547         struct input_dev *input_dev = data->input_dev;
548         int error;
549 
550         mutex_lock(&input_dev->mutex);
551         if (input_dev->users) {
552                 error = mms114_start(data);
553                 if (error < 0) {
554                         mutex_unlock(&input_dev->mutex);
555                         return error;
556                 }
557         }
558         mutex_unlock(&input_dev->mutex);
559 
560         return 0;
561 }
562 #endif
563 
564 static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume);
565 
566 static const struct i2c_device_id mms114_id[] = {
567         { "mms114", 0 },
568         { }
569 };
570 MODULE_DEVICE_TABLE(i2c, mms114_id);
571 
572 #ifdef CONFIG_OF
573 static struct of_device_id mms114_dt_match[] = {
574         { .compatible = "melfas,mms114" },
575         { }
576 };
577 #endif
578 
579 static struct i2c_driver mms114_driver = {
580         .driver = {
581                 .name   = "mms114",
582                 .owner  = THIS_MODULE,
583                 .pm     = &mms114_pm_ops,
584                 .of_match_table = of_match_ptr(mms114_dt_match),
585         },
586         .probe          = mms114_probe,
587         .id_table       = mms114_id,
588 };
589 
590 module_i2c_driver(mms114_driver);
591 
592 /* Module information */
593 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
594 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver");
595 MODULE_LICENSE("GPL");
596 

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