2 * Copyright (C) 2012 Samsung Electronics Co.Ltd
3 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
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.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/delay.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>
20 /* Write only registers */
21 #define MMS114_MODE_CONTROL 0x01
22 #define MMS114_OPERATION_MODE_MASK 0xE
23 #define MMS114_ACTIVE (1 << 1)
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
31 /* Read only registers */
32 #define MMS114_PACKET_SIZE 0x0F
33 #define MMS114_INFOMATION 0x10
34 #define MMS114_TSP_REV 0xF0
36 /* Minimum delay time is 50us between stop and start signal of i2c */
37 #define MMS114_I2C_DELAY 50
39 /* 200ms needs after power on */
40 #define MMS114_POWERON_DELAY 200
42 /* Touchscreen absolute values */
43 #define MMS114_MAX_AREA 0xff
45 #define MMS114_MAX_TOUCH 10
46 #define MMS114_PACKET_NUM 8
49 #define MMS114_TYPE_NONE 0
50 #define MMS114_TYPE_TOUCHSCREEN 1
51 #define MMS114_TYPE_TOUCHKEY 2
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;
60 /* Use cache data for mode control register(write only) */
61 u8 cache_mode_control;
65 u8 id:4, reserved_bit4:1, type:2, pressed:1;
74 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
75 unsigned int len, u8 *val)
77 struct i2c_client *client = data->client;
78 struct i2c_msg xfer[2];
82 if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
85 /* Write register: use repeated start */
86 xfer[0].addr = client->addr;
87 xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART;
92 xfer[1].addr = client->addr;
93 xfer[1].flags = I2C_M_RD;
97 error = i2c_transfer(client->adapter, xfer, 2);
100 "%s: i2c transfer failed (%d)\n", __func__, error);
101 return error < 0 ? error : -EIO;
103 udelay(MMS114_I2C_DELAY);
108 static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
113 if (reg == MMS114_MODE_CONTROL)
114 return data->cache_mode_control;
116 error = __mms114_read_reg(data, reg, 1, &val);
117 return error < 0 ? error : val;
120 static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
123 struct i2c_client *client = data->client;
130 error = i2c_master_send(client, buf, 2);
132 dev_err(&client->dev,
133 "%s: i2c send failed (%d)\n", __func__, error);
134 return error < 0 ? error : -EIO;
136 udelay(MMS114_I2C_DELAY);
138 if (reg == MMS114_MODE_CONTROL)
139 data->cache_mode_control = val;
144 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
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;
153 if (touch->id > MMS114_MAX_TOUCH) {
154 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id);
158 if (touch->type != MMS114_TYPE_TOUCHSCREEN) {
159 dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type);
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);
173 x = pdata->x_size - x;
175 y = pdata->y_size - y;
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);
182 input_mt_slot(input_dev, id);
183 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed);
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);
193 static irqreturn_t mms114_interrupt(int irq, void *dev_id)
195 struct mms114_data *data = dev_id;
196 struct input_dev *input_dev = data->input_dev;
197 struct mms114_touch touch[MMS114_MAX_TOUCH];
203 mutex_lock(&input_dev->mutex);
204 if (!input_dev->users) {
205 mutex_unlock(&input_dev->mutex);
208 mutex_unlock(&input_dev->mutex);
210 packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE);
211 if (packet_size <= 0)
214 touch_size = packet_size / MMS114_PACKET_NUM;
216 error = __mms114_read_reg(data, MMS114_INFOMATION, packet_size,
221 for (index = 0; index < touch_size; index++)
222 mms114_process_mt(data, touch + index);
224 input_mt_report_pointer_emulation(data->input_dev, true);
225 input_sync(data->input_dev);
231 static int mms114_set_active(struct mms114_data *data, bool active)
235 val = mms114_read_reg(data, MMS114_MODE_CONTROL);
239 val &= ~MMS114_OPERATION_MODE_MASK;
241 /* If active is false, sleep mode */
243 val |= MMS114_ACTIVE;
245 return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
248 static int mms114_get_version(struct mms114_data *data)
250 struct device *dev = &data->client->dev;
254 error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
258 dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
259 buf[0], buf[1], buf[3]);
264 static int mms114_setup_regs(struct mms114_data *data)
266 const struct mms114_platform_data *pdata = data->pdata;
270 error = mms114_get_version(data);
274 error = mms114_set_active(data, true);
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);
284 val = pdata->x_size & 0xff;
285 error = mms114_write_reg(data, MMS114_X_RESOLUTION, val);
289 val = pdata->y_size & 0xff;
290 error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val);
294 if (pdata->contact_threshold) {
295 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD,
296 pdata->contact_threshold);
301 if (pdata->moving_threshold) {
302 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD,
303 pdata->moving_threshold);
311 static int mms114_start(struct mms114_data *data)
313 struct i2c_client *client = data->client;
317 regulator_enable(data->core_reg);
319 regulator_enable(data->io_reg);
320 mdelay(MMS114_POWERON_DELAY);
322 error = mms114_setup_regs(data);
326 if (data->pdata->cfg_pin)
327 data->pdata->cfg_pin(true);
329 enable_irq(client->irq);
334 static void mms114_stop(struct mms114_data *data)
336 struct i2c_client *client = data->client;
338 disable_irq(client->irq);
340 if (data->pdata->cfg_pin)
341 data->pdata->cfg_pin(false);
344 regulator_disable(data->io_reg);
346 regulator_disable(data->core_reg);
349 static int mms114_input_open(struct input_dev *dev)
351 struct mms114_data *data = input_get_drvdata(dev);
353 return mms114_start(data);
356 static void mms114_input_close(struct input_dev *dev)
358 struct mms114_data *data = input_get_drvdata(dev);
363 static int __devinit mms114_probe(struct i2c_client *client,
364 const struct i2c_device_id *id)
366 struct mms114_data *data;
367 struct input_dev *input_dev;
370 if (!client->dev.platform_data) {
371 dev_err(&client->dev, "Need platform data\n");
375 if (!i2c_check_functionality(client->adapter,
376 I2C_FUNC_PROTOCOL_MANGLING)) {
377 dev_err(&client->dev,
378 "Need i2c bus that supports protocol mangling\n");
382 data = kzalloc(sizeof(struct mms114_data), GFP_KERNEL);
383 input_dev = input_allocate_device();
384 if (!data || !input_dev) {
385 dev_err(&client->dev, "Failed to allocate memory\n");
390 data->client = client;
391 data->input_dev = input_dev;
392 data->pdata = client->dev.platform_data;
394 input_dev->name = "MELPAS MMS114 Touchscreen";
395 input_dev->id.bustype = BUS_I2C;
396 input_dev->dev.parent = &client->dev;
397 input_dev->open = mms114_input_open;
398 input_dev->close = mms114_input_close;
400 __set_bit(EV_ABS, input_dev->evbit);
401 __set_bit(EV_KEY, input_dev->evbit);
402 __set_bit(BTN_TOUCH, input_dev->keybit);
403 input_set_abs_params(input_dev, ABS_X, 0, data->pdata->x_size, 0, 0);
404 input_set_abs_params(input_dev, ABS_Y, 0, data->pdata->y_size, 0, 0);
406 /* For multi touch */
407 input_mt_init_slots(input_dev, MMS114_MAX_TOUCH, 0);
408 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
409 0, MMS114_MAX_AREA, 0, 0);
410 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
411 0, data->pdata->x_size, 0, 0);
412 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
413 0, data->pdata->y_size, 0, 0);
414 input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
416 input_set_drvdata(input_dev, data);
417 i2c_set_clientdata(client, data);
419 data->core_reg = regulator_get(&client->dev, "avdd");
420 if (IS_ERR(data->core_reg)) {
421 error = PTR_ERR(data->core_reg);
422 dev_err(&client->dev,
423 "Unable to get the Core regulator (%d)\n", error);
427 data->io_reg = regulator_get(&client->dev, "vdd");
428 if (IS_ERR(data->io_reg)) {
429 error = PTR_ERR(data->io_reg);
430 dev_err(&client->dev,
431 "Unable to get the IO regulator (%d)\n", error);
435 error = request_threaded_irq(client->irq, NULL, mms114_interrupt,
436 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "mms114", data);
438 dev_err(&client->dev, "Failed to register interrupt\n");
441 disable_irq(client->irq);
443 error = input_register_device(data->input_dev);
450 free_irq(client->irq, data);
452 regulator_put(data->io_reg);
454 regulator_put(data->core_reg);
456 input_free_device(input_dev);
461 static int __devexit mms114_remove(struct i2c_client *client)
463 struct mms114_data *data = i2c_get_clientdata(client);
465 free_irq(client->irq, data);
466 regulator_put(data->io_reg);
467 regulator_put(data->core_reg);
468 input_unregister_device(data->input_dev);
474 #ifdef CONFIG_PM_SLEEP
475 static int mms114_suspend(struct device *dev)
477 struct i2c_client *client = to_i2c_client(dev);
478 struct mms114_data *data = i2c_get_clientdata(client);
479 struct input_dev *input_dev = data->input_dev;
482 /* Release all touch */
483 for (id = 0; id < MMS114_MAX_TOUCH; id++) {
484 input_mt_slot(input_dev, id);
485 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
488 input_mt_report_pointer_emulation(input_dev, true);
489 input_sync(input_dev);
491 mutex_lock(&input_dev->mutex);
492 if (input_dev->users)
494 mutex_unlock(&input_dev->mutex);
499 static int mms114_resume(struct device *dev)
501 struct i2c_client *client = to_i2c_client(dev);
502 struct mms114_data *data = i2c_get_clientdata(client);
503 struct input_dev *input_dev = data->input_dev;
506 mutex_lock(&input_dev->mutex);
507 if (input_dev->users) {
508 error = mms114_start(data);
510 mutex_unlock(&input_dev->mutex);
514 mutex_unlock(&input_dev->mutex);
520 static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume);
522 static const struct i2c_device_id mms114_id[] = {
526 MODULE_DEVICE_TABLE(i2c, mms114_id);
528 static struct i2c_driver mms114_driver = {
531 .owner = THIS_MODULE,
532 .pm = &mms114_pm_ops,
534 .probe = mms114_probe,
535 .remove = __devexit_p(mms114_remove),
536 .id_table = mms114_id,
539 module_i2c_driver(mms114_driver);
541 /* Module information */
542 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
543 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver");
544 MODULE_LICENSE("GPL");