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/pm_runtime.h>
32 #include <linux/irq.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_TOUCH_ID_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;
78 struct touchscreen_properties prop;
81 struct input_mt_pos pos[SILEAD_MAX_FINGERS];
82 int slots[SILEAD_MAX_FINGERS];
83 int id[SILEAD_MAX_FINGERS];
86 struct silead_fw_data {
91 static int silead_ts_request_input_dev(struct silead_ts_data *data)
93 struct device *dev = &data->client->dev;
96 data->input = devm_input_allocate_device(dev);
99 "Failed to allocate input device\n");
103 input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
104 input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
105 touchscreen_parse_properties(data->input, true, &data->prop);
107 input_mt_init_slots(data->input, data->max_fingers,
108 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
111 data->input->name = SILEAD_TS_NAME;
112 data->input->phys = "input/ts";
113 data->input->id.bustype = BUS_I2C;
115 error = input_register_device(data->input);
117 dev_err(dev, "Failed to register input device: %d\n", error);
124 static void silead_ts_set_power(struct i2c_client *client,
125 enum silead_ts_power state)
127 struct silead_ts_data *data = i2c_get_clientdata(client);
129 if (data->gpio_power) {
130 gpiod_set_value_cansleep(data->gpio_power, state);
131 msleep(SILEAD_POWER_SLEEP);
135 static void silead_ts_read_data(struct i2c_client *client)
137 struct silead_ts_data *data = i2c_get_clientdata(client);
138 struct input_dev *input = data->input;
139 struct device *dev = &client->dev;
140 u8 *bufp, buf[SILEAD_TS_DATA_LEN];
141 int touch_nr, error, i;
143 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
144 SILEAD_TS_DATA_LEN, buf);
146 dev_err(dev, "Data read error %d\n", error);
151 if (touch_nr > data->max_fingers) {
152 dev_warn(dev, "More touches reported then supported %d > %d\n",
153 touch_nr, data->max_fingers);
154 touch_nr = data->max_fingers;
157 bufp = buf + SILEAD_POINT_DATA_LEN;
158 for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) {
159 /* Bits 4-7 are the touch id */
160 data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] &
161 SILEAD_TOUCH_ID_MASK) >> 4;
162 touchscreen_set_mt_pos(&data->pos[i], &data->prop,
163 get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
164 get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
167 input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
169 for (i = 0; i < touch_nr; i++) {
170 input_mt_slot(input, data->slots[i]);
171 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
172 input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
173 input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
175 dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
176 data->pos[i].y, data->id[i], data->slots[i]);
179 input_mt_sync_frame(input);
183 static int silead_ts_init(struct i2c_client *client)
185 struct silead_ts_data *data = i2c_get_clientdata(client);
188 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
192 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
194 error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
198 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
200 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
204 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
206 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
210 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
215 dev_err(&client->dev, "Registers clear error %d\n", error);
219 static int silead_ts_reset(struct i2c_client *client)
223 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
227 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
229 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
233 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
235 error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
239 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
244 dev_err(&client->dev, "Chip reset error %d\n", error);
248 static int silead_ts_startup(struct i2c_client *client)
252 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
254 dev_err(&client->dev, "Startup error %d\n", error);
258 msleep(SILEAD_STARTUP_SLEEP);
263 static int silead_ts_load_fw(struct i2c_client *client)
265 struct device *dev = &client->dev;
266 struct silead_ts_data *data = i2c_get_clientdata(client);
267 unsigned int fw_size, i;
268 const struct firmware *fw;
269 struct silead_fw_data *fw_data;
272 dev_dbg(dev, "Firmware file name: %s", data->fw_name);
274 error = reject_firmware(&fw, data->fw_name, dev);
276 dev_err(dev, "Firmware request error %d\n", error);
280 fw_size = fw->size / sizeof(*fw_data);
281 fw_data = (struct silead_fw_data *)fw->data;
283 for (i = 0; i < fw_size; i++) {
284 error = i2c_smbus_write_i2c_block_data(client,
287 (u8 *)&fw_data[i].val);
289 dev_err(dev, "Firmware load error %d\n", error);
294 release_firmware(fw);
298 static u32 silead_ts_get_status(struct i2c_client *client)
303 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
304 sizeof(status), (u8 *)&status);
306 dev_err(&client->dev, "Status read error %d\n", error);
310 return le32_to_cpu(status);
313 static int silead_ts_get_id(struct i2c_client *client)
315 struct silead_ts_data *data = i2c_get_clientdata(client);
319 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
320 sizeof(chip_id), (u8 *)&chip_id);
324 data->chip_id = le32_to_cpu(chip_id);
325 dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
330 static int silead_ts_setup(struct i2c_client *client)
336 * Some buggy BIOS-es bring up the chip in a stuck state where it
337 * blocks the I2C bus. The following steps are necessary to
338 * unstuck the chip / bus:
339 * 1. Turn off the Silead chip.
340 * 2. Try to do an I2C transfer with the chip, this will fail in
341 * response to which the I2C-bus-driver will call:
342 * i2c_recover_bus() which will unstuck the I2C-bus. Note the
343 * unstuck-ing of the I2C bus only works if we first drop the
344 * chip off the bus by turning it off.
345 * 3. Turn the chip back on.
347 * On the x86/ACPI systems were this problem is seen, step 1. and
348 * 3. require making ACPI calls and dealing with ACPI Power
349 * Resources. The workaround below runtime-suspends the chip to
350 * turn it off, leaving it up to the ACPI subsystem to deal with
354 if (device_property_read_bool(&client->dev,
355 "silead,stuck-controller-bug")) {
356 pm_runtime_set_active(&client->dev);
357 pm_runtime_enable(&client->dev);
358 pm_runtime_allow(&client->dev);
360 pm_runtime_suspend(&client->dev);
362 dev_warn(&client->dev, FW_BUG "Stuck I2C bus: please ignore the next 'controller timed out' error\n");
363 silead_ts_get_id(client);
365 /* The forbid will also resume the device */
366 pm_runtime_forbid(&client->dev);
367 pm_runtime_disable(&client->dev);
370 silead_ts_set_power(client, SILEAD_POWER_OFF);
371 silead_ts_set_power(client, SILEAD_POWER_ON);
373 error = silead_ts_get_id(client);
375 dev_err(&client->dev, "Chip ID read error %d\n", error);
379 error = silead_ts_init(client);
383 error = silead_ts_reset(client);
387 error = silead_ts_load_fw(client);
391 error = silead_ts_startup(client);
395 status = silead_ts_get_status(client);
396 if (status != SILEAD_STATUS_OK) {
397 dev_err(&client->dev,
398 "Initialization error, status: 0x%X\n", status);
405 static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
407 struct silead_ts_data *data = id;
408 struct i2c_client *client = data->client;
410 silead_ts_read_data(client);
415 static void silead_ts_read_props(struct i2c_client *client)
417 struct silead_ts_data *data = i2c_get_clientdata(client);
418 struct device *dev = &client->dev;
422 error = device_property_read_u32(dev, "silead,max-fingers",
425 dev_dbg(dev, "Max fingers read error %d\n", error);
426 data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
429 error = device_property_read_string(dev, "firmware-name", &str);
433 dev_dbg(dev, "Firmware file name read error. Using default.");
437 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
438 const struct i2c_device_id *id)
440 const struct acpi_device_id *acpi_id;
441 struct device *dev = &data->client->dev;
444 if (ACPI_HANDLE(dev)) {
445 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
449 snprintf(data->fw_name, sizeof(data->fw_name),
450 "/*(DEBLOBBED)*/", acpi_id->id);
452 for (i = 0; i < strlen(data->fw_name); i++)
453 data->fw_name[i] = tolower(data->fw_name[i]);
455 snprintf(data->fw_name, sizeof(data->fw_name),
456 "/*(DEBLOBBED)*/", id->name);
462 static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
463 const struct i2c_device_id *id)
465 snprintf(data->fw_name, sizeof(data->fw_name),
466 "/*(DEBLOBBED)*/", id->name);
471 static int silead_ts_probe(struct i2c_client *client,
472 const struct i2c_device_id *id)
474 struct silead_ts_data *data;
475 struct device *dev = &client->dev;
478 if (!i2c_check_functionality(client->adapter,
480 I2C_FUNC_SMBUS_READ_I2C_BLOCK |
481 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
482 dev_err(dev, "I2C functionality check failed\n");
486 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
490 i2c_set_clientdata(client, data);
491 data->client = client;
493 error = silead_ts_set_default_fw_name(data, id);
497 silead_ts_read_props(client);
499 /* We must have the IRQ provided by DT or ACPI subsytem */
500 if (client->irq <= 0)
504 data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
505 if (IS_ERR(data->gpio_power)) {
506 if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
507 dev_err(dev, "Shutdown GPIO request failed\n");
508 return PTR_ERR(data->gpio_power);
511 error = silead_ts_setup(client);
515 error = silead_ts_request_input_dev(data);
519 error = devm_request_threaded_irq(dev, client->irq,
520 NULL, silead_ts_threaded_irq_handler,
521 IRQF_ONESHOT, client->name, data);
523 if (error != -EPROBE_DEFER)
524 dev_err(dev, "IRQ request failed %d\n", error);
531 static int __maybe_unused silead_ts_suspend(struct device *dev)
533 struct i2c_client *client = to_i2c_client(dev);
535 silead_ts_set_power(client, SILEAD_POWER_OFF);
539 static int __maybe_unused silead_ts_resume(struct device *dev)
541 struct i2c_client *client = to_i2c_client(dev);
542 bool second_try = false;
545 silead_ts_set_power(client, SILEAD_POWER_ON);
548 error = silead_ts_reset(client);
553 error = silead_ts_load_fw(client);
558 error = silead_ts_startup(client);
562 status = silead_ts_get_status(client);
563 if (status != SILEAD_STATUS_OK) {
566 dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
569 dev_err(dev, "Resume error, status: 0x%02x\n", status);
576 static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
578 static const struct i2c_device_id silead_ts_id[] = {
587 MODULE_DEVICE_TABLE(i2c, silead_ts_id);
590 static const struct acpi_device_id silead_ts_acpi_match[] = {
599 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
602 static struct i2c_driver silead_ts_driver = {
603 .probe = silead_ts_probe,
604 .id_table = silead_ts_id,
606 .name = SILEAD_TS_NAME,
607 .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
611 module_i2c_driver(silead_ts_driver);
613 MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
614 MODULE_DESCRIPTION("Silead I2C touchscreen driver");
615 MODULE_LICENSE("GPL");