1 /* -------------------------------------------------------------------------
2 * Copyright (C) 2014-2015, Intel Corporation
6 * Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 * -------------------------------------------------------------------------
20 #include <linux/i2c.h>
21 #include <linux/module.h>
22 #include <linux/acpi.h>
23 #include <linux/interrupt.h>
24 #include <linux/gpio/consumer.h>
25 #include <linux/delay.h>
26 #include <linux/firmware.h>
27 #include <linux/input.h>
28 #include <linux/input/mt.h>
29 #include <linux/input/touchscreen.h>
31 #include <linux/irq.h>
32 #include <linux/regulator/consumer.h>
34 #include <asm/unaligned.h>
36 #define SILEAD_TS_NAME "silead_ts"
38 #define SILEAD_REG_RESET 0xE0
39 #define SILEAD_REG_DATA 0x80
40 #define SILEAD_REG_TOUCH_NR 0x80
41 #define SILEAD_REG_POWER 0xBC
42 #define SILEAD_REG_CLOCK 0xE4
43 #define SILEAD_REG_STATUS 0xB0
44 #define SILEAD_REG_ID 0xFC
45 #define SILEAD_REG_MEM_CHECK 0xB0
47 #define SILEAD_STATUS_OK 0x5A5A5A5A
48 #define SILEAD_TS_DATA_LEN 44
49 #define SILEAD_CLOCK 0x04
51 #define SILEAD_CMD_RESET 0x88
52 #define SILEAD_CMD_START 0x00
54 #define SILEAD_POINT_DATA_LEN 0x04
55 #define SILEAD_POINT_Y_OFF 0x00
56 #define SILEAD_POINT_Y_MSB_OFF 0x01
57 #define SILEAD_POINT_X_OFF 0x02
58 #define SILEAD_POINT_X_MSB_OFF 0x03
59 #define SILEAD_EXTRA_DATA_MASK 0xF0
61 #define SILEAD_CMD_SLEEP_MIN 10000
62 #define SILEAD_CMD_SLEEP_MAX 20000
63 #define SILEAD_POWER_SLEEP 20
64 #define SILEAD_STARTUP_SLEEP 30
66 #define SILEAD_MAX_FINGERS 10
68 enum silead_ts_power {
73 struct silead_ts_data {
74 struct i2c_client *client;
75 struct gpio_desc *gpio_power;
76 struct input_dev *input;
77 struct regulator_bulk_data regulators[2];
79 struct touchscreen_properties prop;
82 struct input_mt_pos pos[SILEAD_MAX_FINGERS];
83 int slots[SILEAD_MAX_FINGERS];
84 int id[SILEAD_MAX_FINGERS];
87 struct silead_fw_data {
92 static int silead_ts_request_input_dev(struct silead_ts_data *data)
94 struct device *dev = &data->client->dev;
97 data->input = devm_input_allocate_device(dev);
100 "Failed to allocate input device\n");
104 input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
105 input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
106 touchscreen_parse_properties(data->input, true, &data->prop);
108 input_mt_init_slots(data->input, data->max_fingers,
109 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
112 if (device_property_read_bool(dev, "silead,home-button"))
113 input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
115 data->input->name = SILEAD_TS_NAME;
116 data->input->phys = "input/ts";
117 data->input->id.bustype = BUS_I2C;
119 error = input_register_device(data->input);
121 dev_err(dev, "Failed to register input device: %d\n", error);
128 static void silead_ts_set_power(struct i2c_client *client,
129 enum silead_ts_power state)
131 struct silead_ts_data *data = i2c_get_clientdata(client);
133 if (data->gpio_power) {
134 gpiod_set_value_cansleep(data->gpio_power, state);
135 msleep(SILEAD_POWER_SLEEP);
139 static void silead_ts_read_data(struct i2c_client *client)
141 struct silead_ts_data *data = i2c_get_clientdata(client);
142 struct input_dev *input = data->input;
143 struct device *dev = &client->dev;
144 u8 *bufp, buf[SILEAD_TS_DATA_LEN];
145 int touch_nr, softbutton, error, i;
146 bool softbutton_pressed = false;
148 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
149 SILEAD_TS_DATA_LEN, buf);
151 dev_err(dev, "Data read error %d\n", error);
155 if (buf[0] > data->max_fingers) {
156 dev_warn(dev, "More touches reported then supported %d > %d\n",
157 buf[0], data->max_fingers);
158 buf[0] = data->max_fingers;
162 bufp = buf + SILEAD_POINT_DATA_LEN;
163 for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
164 softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
165 SILEAD_EXTRA_DATA_MASK) >> 4;
169 * For now only respond to softbutton == 0x01, some
170 * tablets *without* a capacative button send 0x04
171 * when crossing the edges of the screen.
173 if (softbutton == 0x01)
174 softbutton_pressed = true;
180 * Bits 4-7 are the touch id, note not all models have
181 * hardware touch ids so atm we don't use these.
183 data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
184 SILEAD_EXTRA_DATA_MASK) >> 4;
185 touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
186 get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
187 get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
191 input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
193 for (i = 0; i < touch_nr; i++) {
194 input_mt_slot(input, data->slots[i]);
195 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
196 input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
197 input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
199 dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
200 data->pos[i].y, data->id[i], data->slots[i]);
203 input_mt_sync_frame(input);
204 input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
208 static int silead_ts_init(struct i2c_client *client)
210 struct silead_ts_data *data = i2c_get_clientdata(client);
213 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
217 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
219 error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
223 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
225 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
229 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
231 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
235 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
240 dev_err(&client->dev, "Registers clear error %d\n", error);
244 static int silead_ts_reset(struct i2c_client *client)
248 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
252 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
254 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
258 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
260 error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
264 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
269 dev_err(&client->dev, "Chip reset error %d\n", error);
273 static int silead_ts_startup(struct i2c_client *client)
277 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
279 dev_err(&client->dev, "Startup error %d\n", error);
283 msleep(SILEAD_STARTUP_SLEEP);
288 static int silead_ts_load_fw(struct i2c_client *client)
290 struct device *dev = &client->dev;
291 struct silead_ts_data *data = i2c_get_clientdata(client);
292 unsigned int fw_size, i;
293 const struct firmware *fw;
294 struct silead_fw_data *fw_data;
297 dev_dbg(dev, "Firmware file name: %s", data->fw_name);
299 error = request_firmware(&fw, data->fw_name, dev);
301 dev_err(dev, "Firmware request error %d\n", error);
305 fw_size = fw->size / sizeof(*fw_data);
306 fw_data = (struct silead_fw_data *)fw->data;
308 for (i = 0; i < fw_size; i++) {
309 error = i2c_smbus_write_i2c_block_data(client,
312 (u8 *)&fw_data[i].val);
314 dev_err(dev, "Firmware load error %d\n", error);
319 release_firmware(fw);
323 static u32 silead_ts_get_status(struct i2c_client *client)
328 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
329 sizeof(status), (u8 *)&status);
331 dev_err(&client->dev, "Status read error %d\n", error);
335 return le32_to_cpu(status);
338 static int silead_ts_get_id(struct i2c_client *client)
340 struct silead_ts_data *data = i2c_get_clientdata(client);
344 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
345 sizeof(chip_id), (u8 *)&chip_id);
347 dev_err(&client->dev, "Chip ID read error %d\n", error);
351 data->chip_id = le32_to_cpu(chip_id);
352 dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
357 static int silead_ts_setup(struct i2c_client *client)
362 silead_ts_set_power(client, SILEAD_POWER_OFF);
363 silead_ts_set_power(client, SILEAD_POWER_ON);
365 error = silead_ts_get_id(client);
369 error = silead_ts_init(client);
373 error = silead_ts_reset(client);
377 error = silead_ts_load_fw(client);
381 error = silead_ts_startup(client);
385 status = silead_ts_get_status(client);
386 if (status != SILEAD_STATUS_OK) {
387 dev_err(&client->dev,
388 "Initialization error, status: 0x%X\n", status);
395 static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
397 struct silead_ts_data *data = id;
398 struct i2c_client *client = data->client;
400 silead_ts_read_data(client);
405 static void silead_ts_read_props(struct i2c_client *client)
407 struct silead_ts_data *data = i2c_get_clientdata(client);
408 struct device *dev = &client->dev;
412 error = device_property_read_u32(dev, "silead,max-fingers",
415 dev_dbg(dev, "Max fingers read error %d\n", error);
416 data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
419 error = device_property_read_string(dev, "firmware-name", &str);
421 snprintf(data->fw_name, sizeof(data->fw_name),
424 dev_dbg(dev, "Firmware file name read error. Using default.");
428 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
429 const struct i2c_device_id *id)
431 const struct acpi_device_id *acpi_id;
432 struct device *dev = &data->client->dev;
435 if (ACPI_HANDLE(dev)) {
436 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
440 snprintf(data->fw_name, sizeof(data->fw_name),
441 "silead/%s.fw", acpi_id->id);
443 for (i = 0; i < strlen(data->fw_name); i++)
444 data->fw_name[i] = tolower(data->fw_name[i]);
446 snprintf(data->fw_name, sizeof(data->fw_name),
447 "silead/%s.fw", id->name);
453 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
454 const struct i2c_device_id *id)
456 snprintf(data->fw_name, sizeof(data->fw_name),
457 "silead/%s.fw", id->name);
462 static void silead_disable_regulator(void *arg)
464 struct silead_ts_data *data = arg;
466 regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
469 static int silead_ts_probe(struct i2c_client *client,
470 const struct i2c_device_id *id)
472 struct silead_ts_data *data;
473 struct device *dev = &client->dev;
476 if (!i2c_check_functionality(client->adapter,
478 I2C_FUNC_SMBUS_READ_I2C_BLOCK |
479 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
480 dev_err(dev, "I2C functionality check failed\n");
484 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
488 i2c_set_clientdata(client, data);
489 data->client = client;
491 error = silead_ts_set_default_fw_name(data, id);
495 silead_ts_read_props(client);
497 /* We must have the IRQ provided by DT or ACPI subsytem */
498 if (client->irq <= 0)
501 data->regulators[0].supply = "vddio";
502 data->regulators[1].supply = "avdd";
503 error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
509 * Enable regulators at probe and disable them at remove, we need
510 * to keep the chip powered otherwise it forgets its firmware.
512 error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
517 error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
522 data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
523 if (IS_ERR(data->gpio_power)) {
524 if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
525 dev_err(dev, "Shutdown GPIO request failed\n");
526 return PTR_ERR(data->gpio_power);
529 error = silead_ts_setup(client);
533 error = silead_ts_request_input_dev(data);
537 error = devm_request_threaded_irq(dev, client->irq,
538 NULL, silead_ts_threaded_irq_handler,
539 IRQF_ONESHOT, client->name, data);
541 if (error != -EPROBE_DEFER)
542 dev_err(dev, "IRQ request failed %d\n", error);
549 static int __maybe_unused silead_ts_suspend(struct device *dev)
551 struct i2c_client *client = to_i2c_client(dev);
553 disable_irq(client->irq);
554 silead_ts_set_power(client, SILEAD_POWER_OFF);
558 static int __maybe_unused silead_ts_resume(struct device *dev)
560 struct i2c_client *client = to_i2c_client(dev);
561 bool second_try = false;
564 silead_ts_set_power(client, SILEAD_POWER_ON);
567 error = silead_ts_reset(client);
572 error = silead_ts_load_fw(client);
577 error = silead_ts_startup(client);
581 status = silead_ts_get_status(client);
582 if (status != SILEAD_STATUS_OK) {
585 dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
588 dev_err(dev, "Resume error, status: 0x%02x\n", status);
592 enable_irq(client->irq);
597 static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
599 static const struct i2c_device_id silead_ts_id[] = {
608 MODULE_DEVICE_TABLE(i2c, silead_ts_id);
611 static const struct acpi_device_id silead_ts_acpi_match[] = {
622 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
626 static const struct of_device_id silead_ts_of_match[] = {
627 { .compatible = "silead,gsl1680" },
628 { .compatible = "silead,gsl1688" },
629 { .compatible = "silead,gsl3670" },
630 { .compatible = "silead,gsl3675" },
631 { .compatible = "silead,gsl3692" },
634 MODULE_DEVICE_TABLE(of, silead_ts_of_match);
637 static struct i2c_driver silead_ts_driver = {
638 .probe = silead_ts_probe,
639 .id_table = silead_ts_id,
641 .name = SILEAD_TS_NAME,
642 .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
643 .of_match_table = of_match_ptr(silead_ts_of_match),
647 module_i2c_driver(silead_ts_driver);
650 MODULE_DESCRIPTION("Silead I2C touchscreen driver");
651 MODULE_LICENSE("GPL");