311 lines
8.2 KiB
C
311 lines
8.2 KiB
C
/*
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* mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller
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*
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* Copyright (C) 2009 Samsung Electronics Co.Ltd
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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*
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* Based on wm97xx-core.c
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/i2c/mcs.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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/* Registers */
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#define MCS5000_TS_STATUS 0x00
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#define STATUS_OFFSET 0
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#define STATUS_NO (0 << STATUS_OFFSET)
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#define STATUS_INIT (1 << STATUS_OFFSET)
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#define STATUS_SENSING (2 << STATUS_OFFSET)
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#define STATUS_COORD (3 << STATUS_OFFSET)
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#define STATUS_GESTURE (4 << STATUS_OFFSET)
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#define ERROR_OFFSET 4
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#define ERROR_NO (0 << ERROR_OFFSET)
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#define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET)
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#define ERROR_INT_RESET (2 << ERROR_OFFSET)
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#define ERROR_EXT_RESET (3 << ERROR_OFFSET)
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#define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET)
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#define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET)
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#define MCS5000_TS_OP_MODE 0x01
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#define RESET_OFFSET 0
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#define RESET_NO (0 << RESET_OFFSET)
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#define RESET_EXT_SOFT (1 << RESET_OFFSET)
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#define OP_MODE_OFFSET 1
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#define OP_MODE_SLEEP (0 << OP_MODE_OFFSET)
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#define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET)
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#define GESTURE_OFFSET 4
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#define GESTURE_DISABLE (0 << GESTURE_OFFSET)
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#define GESTURE_ENABLE (1 << GESTURE_OFFSET)
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#define PROXIMITY_OFFSET 5
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#define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET)
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#define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET)
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#define SCAN_MODE_OFFSET 6
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#define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET)
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#define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET)
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#define REPORT_RATE_OFFSET 7
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#define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET)
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#define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET)
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#define MCS5000_TS_SENS_CTL 0x02
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#define MCS5000_TS_FILTER_CTL 0x03
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#define PRI_FILTER_OFFSET 0
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#define SEC_FILTER_OFFSET 4
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#define MCS5000_TS_X_SIZE_UPPER 0x08
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#define MCS5000_TS_X_SIZE_LOWER 0x09
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#define MCS5000_TS_Y_SIZE_UPPER 0x0A
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#define MCS5000_TS_Y_SIZE_LOWER 0x0B
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#define MCS5000_TS_INPUT_INFO 0x10
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#define INPUT_TYPE_OFFSET 0
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#define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET)
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#define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET)
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#define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET)
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#define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET)
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#define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET)
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#define GESTURE_CODE_OFFSET 3
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#define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET)
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#define MCS5000_TS_X_POS_UPPER 0x11
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#define MCS5000_TS_X_POS_LOWER 0x12
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#define MCS5000_TS_Y_POS_UPPER 0x13
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#define MCS5000_TS_Y_POS_LOWER 0x14
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#define MCS5000_TS_Z_POS 0x15
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#define MCS5000_TS_WIDTH 0x16
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#define MCS5000_TS_GESTURE_VAL 0x17
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#define MCS5000_TS_MODULE_REV 0x20
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#define MCS5000_TS_FIRMWARE_VER 0x21
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/* Touchscreen absolute values */
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#define MCS5000_MAX_XC 0x3ff
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#define MCS5000_MAX_YC 0x3ff
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enum mcs5000_ts_read_offset {
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READ_INPUT_INFO,
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READ_X_POS_UPPER,
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READ_X_POS_LOWER,
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READ_Y_POS_UPPER,
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READ_Y_POS_LOWER,
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READ_BLOCK_SIZE,
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};
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/* Each client has this additional data */
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struct mcs5000_ts_data {
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struct i2c_client *client;
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struct input_dev *input_dev;
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const struct mcs_platform_data *platform_data;
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};
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static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
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{
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struct mcs5000_ts_data *data = dev_id;
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struct i2c_client *client = data->client;
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u8 buffer[READ_BLOCK_SIZE];
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int err;
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int x;
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int y;
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err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
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READ_BLOCK_SIZE, buffer);
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if (err < 0) {
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dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
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goto out;
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}
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switch (buffer[READ_INPUT_INFO]) {
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case INPUT_TYPE_NONTOUCH:
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input_report_key(data->input_dev, BTN_TOUCH, 0);
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input_sync(data->input_dev);
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break;
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case INPUT_TYPE_SINGLE:
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x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];
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y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];
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input_report_key(data->input_dev, BTN_TOUCH, 1);
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input_report_abs(data->input_dev, ABS_X, x);
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input_report_abs(data->input_dev, ABS_Y, y);
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input_sync(data->input_dev);
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break;
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case INPUT_TYPE_DUAL:
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/* TODO */
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break;
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case INPUT_TYPE_PALM:
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/* TODO */
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break;
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case INPUT_TYPE_PROXIMITY:
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/* TODO */
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break;
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default:
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dev_err(&client->dev, "Unknown ts input type %d\n",
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buffer[READ_INPUT_INFO]);
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break;
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}
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out:
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return IRQ_HANDLED;
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}
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static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
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{
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const struct mcs_platform_data *platform_data =
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data->platform_data;
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struct i2c_client *client = data->client;
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/* Touch reset & sleep mode */
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i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
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RESET_EXT_SOFT | OP_MODE_SLEEP);
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/* Touch size */
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i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,
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platform_data->x_size >> 8);
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i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,
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platform_data->x_size & 0xff);
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i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,
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platform_data->y_size >> 8);
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i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,
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platform_data->y_size & 0xff);
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/* Touch active mode & 80 report rate */
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i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
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OP_MODE_ACTIVE | REPORT_RATE_80);
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}
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static int mcs5000_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mcs5000_ts_data *data;
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struct input_dev *input_dev;
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int ret;
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if (!client->dev.platform_data)
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return -EINVAL;
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data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!data || !input_dev) {
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dev_err(&client->dev, "Failed to allocate memory\n");
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ret = -ENOMEM;
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goto err_free_mem;
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}
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data->client = client;
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data->input_dev = input_dev;
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data->platform_data = client->dev.platform_data;
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input_dev->name = "MELPAS MCS-5000 Touchscreen";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &client->dev;
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__set_bit(EV_ABS, input_dev->evbit);
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(BTN_TOUCH, input_dev->keybit);
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input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
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input_set_drvdata(input_dev, data);
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if (data->platform_data->cfg_pin)
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data->platform_data->cfg_pin();
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ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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goto err_free_mem;
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}
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ret = input_register_device(data->input_dev);
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if (ret < 0)
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goto err_free_irq;
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mcs5000_ts_phys_init(data);
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i2c_set_clientdata(client, data);
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return 0;
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err_free_irq:
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free_irq(client->irq, data);
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err_free_mem:
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input_free_device(input_dev);
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kfree(data);
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return ret;
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}
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static int mcs5000_ts_remove(struct i2c_client *client)
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{
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struct mcs5000_ts_data *data = i2c_get_clientdata(client);
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free_irq(client->irq, data);
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input_unregister_device(data->input_dev);
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kfree(data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int mcs5000_ts_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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/* Touch sleep mode */
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i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
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return 0;
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}
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static int mcs5000_ts_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct mcs5000_ts_data *data = i2c_get_clientdata(client);
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mcs5000_ts_phys_init(data);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
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#endif
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static const struct i2c_device_id mcs5000_ts_id[] = {
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{ "mcs5000_ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
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static struct i2c_driver mcs5000_ts_driver = {
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.probe = mcs5000_ts_probe,
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.remove = mcs5000_ts_remove,
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.driver = {
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.name = "mcs5000_ts",
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#ifdef CONFIG_PM
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.pm = &mcs5000_ts_pm,
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#endif
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},
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.id_table = mcs5000_ts_id,
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};
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module_i2c_driver(mcs5000_ts_driver);
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/* Module information */
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MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
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MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
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MODULE_LICENSE("GPL");
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