1 // SPDX-License-Identifier: GPL-2.0
2 // Melfas MMS114/MMS136/MMS152 touchscreen device driver
4 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 // Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 #include <linux/module.h>
8 #include <linux/delay.h>
10 #include <linux/of_device.h>
11 #include <linux/i2c.h>
12 #include <linux/input/mt.h>
13 #include <linux/input/touchscreen.h>
14 #include <linux/interrupt.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/slab.h>
18 /* Write only registers */
19 #define MMS114_MODE_CONTROL 0x01
20 #define MMS114_OPERATION_MODE_MASK 0xE
21 #define MMS114_ACTIVE BIT(1)
23 #define MMS114_XY_RESOLUTION_H 0x02
24 #define MMS114_X_RESOLUTION 0x03
25 #define MMS114_Y_RESOLUTION 0x04
26 #define MMS114_CONTACT_THRESHOLD 0x05
27 #define MMS114_MOVING_THRESHOLD 0x06
29 /* Read only registers */
30 #define MMS114_PACKET_SIZE 0x0F
31 #define MMS114_INFORMATION 0x10
32 #define MMS114_TSP_REV 0xF0
34 #define MMS152_FW_REV 0xE1
35 #define MMS152_COMPAT_GROUP 0xF2
37 /* Minimum delay time is 50us between stop and start signal of i2c */
38 #define MMS114_I2C_DELAY 50
40 /* 200ms needs after power on */
41 #define MMS114_POWERON_DELAY 200
43 /* Touchscreen absolute values */
44 #define MMS114_MAX_AREA 0xff
46 #define MMS114_MAX_TOUCH 10
47 #define MMS114_EVENT_SIZE 8
48 #define MMS136_EVENT_SIZE 6
51 #define MMS114_TYPE_NONE 0
52 #define MMS114_TYPE_TOUCHSCREEN 1
53 #define MMS114_TYPE_TOUCHKEY 2
63 struct i2c_client *client;
64 struct input_dev *input_dev;
65 struct regulator *core_reg;
66 struct regulator *io_reg;
67 struct touchscreen_properties props;
69 unsigned int contact_threshold;
70 unsigned int moving_threshold;
72 /* Use cache data for mode control register(write only) */
73 u8 cache_mode_control;
77 u8 id:4, reserved_bit4:1, type:2, pressed:1;
86 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
87 unsigned int len, u8 *val)
89 struct i2c_client *client = data->client;
90 struct i2c_msg xfer[2];
94 if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
98 xfer[0].addr = client->addr;
99 xfer[0].flags = client->flags & I2C_M_TEN;
104 xfer[1].addr = client->addr;
105 xfer[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
109 error = i2c_transfer(client->adapter, xfer, 2);
111 dev_err(&client->dev,
112 "%s: i2c transfer failed (%d)\n", __func__, error);
113 return error < 0 ? error : -EIO;
115 udelay(MMS114_I2C_DELAY);
120 static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
125 if (reg == MMS114_MODE_CONTROL)
126 return data->cache_mode_control;
128 error = __mms114_read_reg(data, reg, 1, &val);
129 return error < 0 ? error : val;
132 static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
135 struct i2c_client *client = data->client;
142 error = i2c_master_send(client, buf, 2);
144 dev_err(&client->dev,
145 "%s: i2c send failed (%d)\n", __func__, error);
146 return error < 0 ? error : -EIO;
148 udelay(MMS114_I2C_DELAY);
150 if (reg == MMS114_MODE_CONTROL)
151 data->cache_mode_control = val;
156 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
158 struct i2c_client *client = data->client;
159 struct input_dev *input_dev = data->input_dev;
164 if (touch->id > MMS114_MAX_TOUCH) {
165 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id);
169 if (touch->type != MMS114_TYPE_TOUCHSCREEN) {
170 dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type);
175 x = touch->x_lo | touch->x_hi << 8;
176 y = touch->y_lo | touch->y_hi << 8;
178 dev_dbg(&client->dev,
179 "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n",
180 id, touch->type, touch->pressed,
181 x, y, touch->width, touch->strength);
183 input_mt_slot(input_dev, id);
184 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed);
186 if (touch->pressed) {
187 touchscreen_report_pos(input_dev, &data->props, x, y, true);
188 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width);
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_device_enabled(input_dev)) {
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 /* MMS136 has slightly different event size */
215 if (data->type == TYPE_MMS136)
216 touch_size = packet_size / MMS136_EVENT_SIZE;
218 touch_size = packet_size / MMS114_EVENT_SIZE;
220 error = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,
225 for (index = 0; index < touch_size; index++)
226 mms114_process_mt(data, touch + index);
228 input_mt_report_pointer_emulation(data->input_dev, true);
229 input_sync(data->input_dev);
235 static int mms114_set_active(struct mms114_data *data, bool active)
239 val = mms114_read_reg(data, MMS114_MODE_CONTROL);
243 val &= ~MMS114_OPERATION_MODE_MASK;
245 /* If active is false, sleep mode */
247 val |= MMS114_ACTIVE;
249 return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
252 static int mms114_get_version(struct mms114_data *data)
254 struct device *dev = &data->client->dev;
259 switch (data->type) {
261 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf);
265 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x\n",
266 buf[0], buf[1], buf[2]);
270 error = __mms114_read_reg(data, MMS152_FW_REV, 3, buf);
274 group = i2c_smbus_read_byte_data(data->client,
275 MMS152_COMPAT_GROUP);
279 dev_info(dev, "TSP FW Rev: bootloader 0x%x / core 0x%x / config 0x%x, Compat group: %c\n",
280 buf[0], buf[1], buf[2], group);
285 error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
289 dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
290 buf[0], buf[1], buf[3]);
297 static int mms114_setup_regs(struct mms114_data *data)
299 const struct touchscreen_properties *props = &data->props;
303 error = mms114_get_version(data);
307 /* Only MMS114 and MMS136 have configuration and power on registers */
308 if (data->type != TYPE_MMS114 && data->type != TYPE_MMS136)
311 error = mms114_set_active(data, true);
315 val = (props->max_x >> 8) & 0xf;
316 val |= ((props->max_y >> 8) & 0xf) << 4;
317 error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val);
321 val = props->max_x & 0xff;
322 error = mms114_write_reg(data, MMS114_X_RESOLUTION, val);
326 val = props->max_x & 0xff;
327 error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val);
331 if (data->contact_threshold) {
332 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD,
333 data->contact_threshold);
338 if (data->moving_threshold) {
339 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD,
340 data->moving_threshold);
348 static int mms114_start(struct mms114_data *data)
350 struct i2c_client *client = data->client;
353 error = regulator_enable(data->core_reg);
355 dev_err(&client->dev, "Failed to enable avdd: %d\n", error);
359 error = regulator_enable(data->io_reg);
361 dev_err(&client->dev, "Failed to enable vdd: %d\n", error);
362 regulator_disable(data->core_reg);
366 msleep(MMS114_POWERON_DELAY);
368 error = mms114_setup_regs(data);
370 regulator_disable(data->io_reg);
371 regulator_disable(data->core_reg);
375 enable_irq(client->irq);
380 static void mms114_stop(struct mms114_data *data)
382 struct i2c_client *client = data->client;
385 disable_irq(client->irq);
387 error = regulator_disable(data->io_reg);
389 dev_warn(&client->dev, "Failed to disable vdd: %d\n", error);
391 error = regulator_disable(data->core_reg);
393 dev_warn(&client->dev, "Failed to disable avdd: %d\n", error);
396 static int mms114_input_open(struct input_dev *dev)
398 struct mms114_data *data = input_get_drvdata(dev);
400 return mms114_start(data);
403 static void mms114_input_close(struct input_dev *dev)
405 struct mms114_data *data = input_get_drvdata(dev);
410 static int mms114_parse_legacy_bindings(struct mms114_data *data)
412 struct device *dev = &data->client->dev;
413 struct touchscreen_properties *props = &data->props;
415 if (device_property_read_u32(dev, "x-size", &props->max_x)) {
416 dev_dbg(dev, "failed to get legacy x-size property\n");
420 if (device_property_read_u32(dev, "y-size", &props->max_y)) {
421 dev_dbg(dev, "failed to get legacy y-size property\n");
425 device_property_read_u32(dev, "contact-threshold",
426 &data->contact_threshold);
427 device_property_read_u32(dev, "moving-threshold",
428 &data->moving_threshold);
430 if (device_property_read_bool(dev, "x-invert"))
431 props->invert_x = true;
432 if (device_property_read_bool(dev, "y-invert"))
433 props->invert_y = true;
435 props->swap_x_y = false;
440 static int mms114_probe(struct i2c_client *client,
441 const struct i2c_device_id *id)
443 struct mms114_data *data;
444 struct input_dev *input_dev;
445 const void *match_data;
448 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
449 dev_err(&client->dev, "Not supported I2C adapter\n");
453 data = devm_kzalloc(&client->dev, sizeof(struct mms114_data),
455 input_dev = devm_input_allocate_device(&client->dev);
456 if (!data || !input_dev) {
457 dev_err(&client->dev, "Failed to allocate memory\n");
461 data->client = client;
462 data->input_dev = input_dev;
464 match_data = device_get_match_data(&client->dev);
468 data->type = (enum mms_type)match_data;
470 input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
471 input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
472 input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
473 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
474 0, MMS114_MAX_AREA, 0, 0);
476 touchscreen_parse_properties(input_dev, true, &data->props);
477 if (!data->props.max_x || !data->props.max_y) {
478 dev_dbg(&client->dev,
479 "missing X/Y size properties, trying legacy bindings\n");
480 error = mms114_parse_legacy_bindings(data);
484 input_set_abs_params(input_dev, ABS_MT_POSITION_X,
485 0, data->props.max_x, 0, 0);
486 input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
487 0, data->props.max_y, 0, 0);
490 if (data->type == TYPE_MMS114 || data->type == TYPE_MMS136) {
492 * The firmware handles movement and pressure fuzz, so
493 * don't duplicate that in software.
495 data->moving_threshold = input_abs_get_fuzz(input_dev,
497 data->contact_threshold = input_abs_get_fuzz(input_dev,
499 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_X, 0);
500 input_abs_set_fuzz(input_dev, ABS_MT_POSITION_Y, 0);
501 input_abs_set_fuzz(input_dev, ABS_MT_PRESSURE, 0);
504 input_dev->name = devm_kasprintf(&client->dev, GFP_KERNEL,
505 "MELFAS MMS%d Touchscreen",
507 if (!input_dev->name)
510 input_dev->id.bustype = BUS_I2C;
511 input_dev->dev.parent = &client->dev;
512 input_dev->open = mms114_input_open;
513 input_dev->close = mms114_input_close;
515 error = input_mt_init_slots(input_dev, MMS114_MAX_TOUCH,
520 input_set_drvdata(input_dev, data);
521 i2c_set_clientdata(client, data);
523 data->core_reg = devm_regulator_get(&client->dev, "avdd");
524 if (IS_ERR(data->core_reg)) {
525 error = PTR_ERR(data->core_reg);
526 dev_err(&client->dev,
527 "Unable to get the Core regulator (%d)\n", error);
531 data->io_reg = devm_regulator_get(&client->dev, "vdd");
532 if (IS_ERR(data->io_reg)) {
533 error = PTR_ERR(data->io_reg);
534 dev_err(&client->dev,
535 "Unable to get the IO regulator (%d)\n", error);
539 error = devm_request_threaded_irq(&client->dev, client->irq,
540 NULL, mms114_interrupt,
541 IRQF_ONESHOT | IRQF_NO_AUTOEN,
542 dev_name(&client->dev), data);
544 dev_err(&client->dev, "Failed to register interrupt\n");
548 error = input_register_device(data->input_dev);
550 dev_err(&client->dev, "Failed to register input device\n");
557 static int __maybe_unused mms114_suspend(struct device *dev)
559 struct i2c_client *client = to_i2c_client(dev);
560 struct mms114_data *data = i2c_get_clientdata(client);
561 struct input_dev *input_dev = data->input_dev;
564 /* Release all touch */
565 for (id = 0; id < MMS114_MAX_TOUCH; id++) {
566 input_mt_slot(input_dev, id);
567 input_mt_report_slot_inactive(input_dev);
570 input_mt_report_pointer_emulation(input_dev, true);
571 input_sync(input_dev);
573 mutex_lock(&input_dev->mutex);
574 if (input_device_enabled(input_dev))
576 mutex_unlock(&input_dev->mutex);
581 static int __maybe_unused mms114_resume(struct device *dev)
583 struct i2c_client *client = to_i2c_client(dev);
584 struct mms114_data *data = i2c_get_clientdata(client);
585 struct input_dev *input_dev = data->input_dev;
588 mutex_lock(&input_dev->mutex);
589 if (input_device_enabled(input_dev)) {
590 error = mms114_start(data);
592 mutex_unlock(&input_dev->mutex);
596 mutex_unlock(&input_dev->mutex);
601 static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume);
603 static const struct i2c_device_id mms114_id[] = {
607 MODULE_DEVICE_TABLE(i2c, mms114_id);
610 static const struct of_device_id mms114_dt_match[] = {
612 .compatible = "melfas,mms114",
613 .data = (void *)TYPE_MMS114,
615 .compatible = "melfas,mms136",
616 .data = (void *)TYPE_MMS136,
618 .compatible = "melfas,mms152",
619 .data = (void *)TYPE_MMS152,
621 .compatible = "melfas,mms345l",
622 .data = (void *)TYPE_MMS345L,
626 MODULE_DEVICE_TABLE(of, mms114_dt_match);
629 static struct i2c_driver mms114_driver = {
632 .pm = &mms114_pm_ops,
633 .of_match_table = of_match_ptr(mms114_dt_match),
635 .probe = mms114_probe,
636 .id_table = mms114_id,
639 module_i2c_driver(mms114_driver);
641 /* Module information */
642 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
643 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver");
644 MODULE_LICENSE("GPL v2");