| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller |
| * |
| * Copyright (C) 2009 Samsung Electronics Co.Ltd |
| * Author: Joonyoung Shim <jy0922.shim@samsung.com> |
| * |
| * Based on wm97xx-core.c |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/input.h> |
| #include <linux/irq.h> |
| #include <linux/platform_data/mcs.h> |
| #include <linux/slab.h> |
| |
| /* Registers */ |
| #define MCS5000_TS_STATUS 0x00 |
| #define STATUS_OFFSET 0 |
| #define STATUS_NO (0 << STATUS_OFFSET) |
| #define STATUS_INIT (1 << STATUS_OFFSET) |
| #define STATUS_SENSING (2 << STATUS_OFFSET) |
| #define STATUS_COORD (3 << STATUS_OFFSET) |
| #define STATUS_GESTURE (4 << STATUS_OFFSET) |
| #define ERROR_OFFSET 4 |
| #define ERROR_NO (0 << ERROR_OFFSET) |
| #define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET) |
| #define ERROR_INT_RESET (2 << ERROR_OFFSET) |
| #define ERROR_EXT_RESET (3 << ERROR_OFFSET) |
| #define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET) |
| #define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET) |
| |
| #define MCS5000_TS_OP_MODE 0x01 |
| #define RESET_OFFSET 0 |
| #define RESET_NO (0 << RESET_OFFSET) |
| #define RESET_EXT_SOFT (1 << RESET_OFFSET) |
| #define OP_MODE_OFFSET 1 |
| #define OP_MODE_SLEEP (0 << OP_MODE_OFFSET) |
| #define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET) |
| #define GESTURE_OFFSET 4 |
| #define GESTURE_DISABLE (0 << GESTURE_OFFSET) |
| #define GESTURE_ENABLE (1 << GESTURE_OFFSET) |
| #define PROXIMITY_OFFSET 5 |
| #define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET) |
| #define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET) |
| #define SCAN_MODE_OFFSET 6 |
| #define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET) |
| #define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET) |
| #define REPORT_RATE_OFFSET 7 |
| #define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET) |
| #define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET) |
| |
| #define MCS5000_TS_SENS_CTL 0x02 |
| #define MCS5000_TS_FILTER_CTL 0x03 |
| #define PRI_FILTER_OFFSET 0 |
| #define SEC_FILTER_OFFSET 4 |
| |
| #define MCS5000_TS_X_SIZE_UPPER 0x08 |
| #define MCS5000_TS_X_SIZE_LOWER 0x09 |
| #define MCS5000_TS_Y_SIZE_UPPER 0x0A |
| #define MCS5000_TS_Y_SIZE_LOWER 0x0B |
| |
| #define MCS5000_TS_INPUT_INFO 0x10 |
| #define INPUT_TYPE_OFFSET 0 |
| #define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET) |
| #define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET) |
| #define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET) |
| #define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET) |
| #define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET) |
| #define GESTURE_CODE_OFFSET 3 |
| #define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET) |
| |
| #define MCS5000_TS_X_POS_UPPER 0x11 |
| #define MCS5000_TS_X_POS_LOWER 0x12 |
| #define MCS5000_TS_Y_POS_UPPER 0x13 |
| #define MCS5000_TS_Y_POS_LOWER 0x14 |
| #define MCS5000_TS_Z_POS 0x15 |
| #define MCS5000_TS_WIDTH 0x16 |
| #define MCS5000_TS_GESTURE_VAL 0x17 |
| #define MCS5000_TS_MODULE_REV 0x20 |
| #define MCS5000_TS_FIRMWARE_VER 0x21 |
| |
| /* Touchscreen absolute values */ |
| #define MCS5000_MAX_XC 0x3ff |
| #define MCS5000_MAX_YC 0x3ff |
| |
| enum mcs5000_ts_read_offset { |
| READ_INPUT_INFO, |
| READ_X_POS_UPPER, |
| READ_X_POS_LOWER, |
| READ_Y_POS_UPPER, |
| READ_Y_POS_LOWER, |
| READ_BLOCK_SIZE, |
| }; |
| |
| /* Each client has this additional data */ |
| struct mcs5000_ts_data { |
| struct i2c_client *client; |
| struct input_dev *input_dev; |
| const struct mcs_platform_data *platform_data; |
| }; |
| |
| static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id) |
| { |
| struct mcs5000_ts_data *data = dev_id; |
| struct i2c_client *client = data->client; |
| u8 buffer[READ_BLOCK_SIZE]; |
| int err; |
| int x; |
| int y; |
| |
| err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO, |
| READ_BLOCK_SIZE, buffer); |
| if (err < 0) { |
| dev_err(&client->dev, "%s, err[%d]\n", __func__, err); |
| goto out; |
| } |
| |
| switch (buffer[READ_INPUT_INFO]) { |
| case INPUT_TYPE_NONTOUCH: |
| input_report_key(data->input_dev, BTN_TOUCH, 0); |
| input_sync(data->input_dev); |
| break; |
| |
| case INPUT_TYPE_SINGLE: |
| x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER]; |
| y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER]; |
| |
| input_report_key(data->input_dev, BTN_TOUCH, 1); |
| input_report_abs(data->input_dev, ABS_X, x); |
| input_report_abs(data->input_dev, ABS_Y, y); |
| input_sync(data->input_dev); |
| break; |
| |
| case INPUT_TYPE_DUAL: |
| /* TODO */ |
| break; |
| |
| case INPUT_TYPE_PALM: |
| /* TODO */ |
| break; |
| |
| case INPUT_TYPE_PROXIMITY: |
| /* TODO */ |
| break; |
| |
| default: |
| dev_err(&client->dev, "Unknown ts input type %d\n", |
| buffer[READ_INPUT_INFO]); |
| break; |
| } |
| |
| out: |
| return IRQ_HANDLED; |
| } |
| |
| static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data, |
| const struct mcs_platform_data *platform_data) |
| { |
| struct i2c_client *client = data->client; |
| |
| /* Touch reset & sleep mode */ |
| i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, |
| RESET_EXT_SOFT | OP_MODE_SLEEP); |
| |
| /* Touch size */ |
| i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER, |
| platform_data->x_size >> 8); |
| i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER, |
| platform_data->x_size & 0xff); |
| i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER, |
| platform_data->y_size >> 8); |
| i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER, |
| platform_data->y_size & 0xff); |
| |
| /* Touch active mode & 80 report rate */ |
| i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE, |
| OP_MODE_ACTIVE | REPORT_RATE_80); |
| } |
| |
| static int mcs5000_ts_probe(struct i2c_client *client) |
| { |
| const struct mcs_platform_data *pdata; |
| struct mcs5000_ts_data *data; |
| struct input_dev *input_dev; |
| int error; |
| |
| pdata = dev_get_platdata(&client->dev); |
| if (!pdata) |
| return -EINVAL; |
| |
| data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
| if (!data) { |
| dev_err(&client->dev, "Failed to allocate memory\n"); |
| return -ENOMEM; |
| } |
| |
| data->client = client; |
| |
| input_dev = devm_input_allocate_device(&client->dev); |
| if (!input_dev) { |
| dev_err(&client->dev, "Failed to allocate input device\n"); |
| return -ENOMEM; |
| } |
| |
| input_dev->name = "MELFAS MCS-5000 Touchscreen"; |
| input_dev->id.bustype = BUS_I2C; |
| input_dev->dev.parent = &client->dev; |
| |
| __set_bit(EV_ABS, input_dev->evbit); |
| __set_bit(EV_KEY, input_dev->evbit); |
| __set_bit(BTN_TOUCH, input_dev->keybit); |
| input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0); |
| input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0); |
| |
| data->input_dev = input_dev; |
| |
| if (pdata->cfg_pin) |
| pdata->cfg_pin(); |
| |
| error = devm_request_threaded_irq(&client->dev, client->irq, |
| NULL, mcs5000_ts_interrupt, |
| IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| "mcs5000_ts", data); |
| if (error) { |
| dev_err(&client->dev, "Failed to register interrupt\n"); |
| return error; |
| } |
| |
| error = input_register_device(data->input_dev); |
| if (error) { |
| dev_err(&client->dev, "Failed to register input device\n"); |
| return error; |
| } |
| |
| mcs5000_ts_phys_init(data, pdata); |
| i2c_set_clientdata(client, data); |
| |
| return 0; |
| } |
| |
| static int mcs5000_ts_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| /* Touch sleep mode */ |
| i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); |
| |
| return 0; |
| } |
| |
| static int mcs5000_ts_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct mcs5000_ts_data *data = i2c_get_clientdata(client); |
| const struct mcs_platform_data *pdata = dev_get_platdata(dev); |
| |
| mcs5000_ts_phys_init(data, pdata); |
| |
| return 0; |
| } |
| |
| static DEFINE_SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, |
| mcs5000_ts_suspend, mcs5000_ts_resume); |
| |
| static const struct i2c_device_id mcs5000_ts_id[] = { |
| { "mcs5000_ts", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id); |
| |
| static struct i2c_driver mcs5000_ts_driver = { |
| .probe_new = mcs5000_ts_probe, |
| .driver = { |
| .name = "mcs5000_ts", |
| .pm = pm_sleep_ptr(&mcs5000_ts_pm), |
| }, |
| .id_table = mcs5000_ts_id, |
| }; |
| |
| module_i2c_driver(mcs5000_ts_driver); |
| |
| /* Module information */ |
| MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); |
| MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); |
| MODULE_LICENSE("GPL"); |