forked from luck/tmp_suning_uos_patched
Input: add EETI eGalax I2C capacitive multi touch driver
This patch adds the EETI eGalax serial multi touch controller driver. EETI eGalax serial touch screen controller is a I2C based multiple capacitive touch screen controller, it can support 5 touch events maximum. Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Zhang Jiejing
Dmitry Torokhov
parent
83551c0159
commit
59bae1db71
@ -177,6 +177,16 @@ config TOUCHSCREEN_EETI
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To compile this driver as a module, choose M here: the
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module will be called eeti_ts.
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config TOUCHSCREEN_EGALAX
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tristate "EETI eGalax multi-touch panel support"
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depends on I2C
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help
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Say Y here to enable support for I2C connected EETI
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eGalax multi-touch panels.
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To compile this driver as a module, choose M here: the
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module will be called egalax_ts.
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config TOUCHSCREEN_FUJITSU
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tristate "Fujitsu serial touchscreen"
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select SERIO
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@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o
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obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
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obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
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obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
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obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
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obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
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303
drivers/input/touchscreen/egalax_ts.c
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303
drivers/input/touchscreen/egalax_ts.c
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@ -0,0 +1,303 @@
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/*
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* Driver for EETI eGalax Multiple Touch Controller
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*
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* Copyright (C) 2011 Freescale Semiconductor, Inc.
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*
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* based on max11801_ts.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* EETI eGalax serial touch screen controller is a I2C based multiple
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* touch screen controller, it supports 5 point multiple touch. */
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/* TODO:
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- auto idle mode support
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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/interrupt.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/input/mt.h>
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/*
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* Mouse Mode: some panel may configure the controller to mouse mode,
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* which can only report one point at a given time.
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* This driver will ignore events in this mode.
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*/
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#define REPORT_MODE_MOUSE 0x1
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/*
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* Vendor Mode: this mode is used to transfer some vendor specific
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* messages.
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* This driver will ignore events in this mode.
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*/
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#define REPORT_MODE_VENDOR 0x3
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/* Multiple Touch Mode */
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#define REPORT_MODE_MTTOUCH 0x4
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#define MAX_SUPPORT_POINTS 5
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#define EVENT_VALID_OFFSET 7
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#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET)
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#define EVENT_ID_OFFSET 2
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#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET)
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#define EVENT_IN_RANGE (0x1 << 1)
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#define EVENT_DOWN_UP (0X1 << 0)
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#define MAX_I2C_DATA_LEN 10
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#define EGALAX_MAX_X 32760
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#define EGALAX_MAX_Y 32760
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#define EGALAX_MAX_TRIES 100
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struct egalax_ts {
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struct i2c_client *client;
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struct input_dev *input_dev;
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};
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static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
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{
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struct egalax_ts *ts = dev_id;
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struct input_dev *input_dev = ts->input_dev;
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struct i2c_client *client = ts->client;
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u8 buf[MAX_I2C_DATA_LEN];
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int id, ret, x, y, z;
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int tries = 0;
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bool down, valid;
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u8 state;
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do {
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ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN);
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} while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);
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if (ret < 0)
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return IRQ_HANDLED;
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if (buf[0] != REPORT_MODE_MTTOUCH) {
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/* ignore mouse events and vendor events */
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return IRQ_HANDLED;
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}
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state = buf[1];
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x = (buf[3] << 8) | buf[2];
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y = (buf[5] << 8) | buf[4];
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z = (buf[7] << 8) | buf[6];
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valid = state & EVENT_VALID_MASK;
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id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET;
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down = state & EVENT_DOWN_UP;
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if (!valid || id > MAX_SUPPORT_POINTS) {
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dev_dbg(&client->dev, "point invalid\n");
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return IRQ_HANDLED;
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}
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input_mt_slot(input_dev, id);
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input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down);
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dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",
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down ? "down" : "up", id, x, y, z);
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if (down) {
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input_report_abs(input_dev, ABS_MT_POSITION_X, x);
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input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
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input_report_abs(input_dev, ABS_MT_PRESSURE, z);
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}
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input_mt_report_pointer_emulation(input_dev, true);
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input_sync(input_dev);
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return IRQ_HANDLED;
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}
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/* wake up controller by an falling edge of interrupt gpio. */
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static int egalax_wake_up_device(struct i2c_client *client)
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{
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int gpio = irq_to_gpio(client->irq);
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int ret;
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ret = gpio_request(gpio, "egalax_irq");
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if (ret < 0) {
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dev_err(&client->dev,
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"request gpio failed, cannot wake up controller: %d\n",
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ret);
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return ret;
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}
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/* wake up controller via an falling edge on IRQ gpio. */
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gpio_direction_output(gpio, 0);
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gpio_set_value(gpio, 1);
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/* controller should be waken up, return irq. */
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gpio_direction_input(gpio);
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gpio_free(gpio);
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return 0;
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}
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static int __devinit egalax_firmware_version(struct i2c_client *client)
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{
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static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
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int ret;
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ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int __devinit egalax_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 egalax_ts *ts;
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struct input_dev *input_dev;
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int ret;
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int error;
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ts = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL);
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if (!ts) {
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dev_err(&client->dev, "Failed to allocate memory\n");
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return -ENOMEM;
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}
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input_dev = input_allocate_device();
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if (!input_dev) {
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dev_err(&client->dev, "Failed to allocate memory\n");
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error = -ENOMEM;
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goto err_free_ts;
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}
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ts->client = client;
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ts->input_dev = input_dev;
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/* controller may be in sleep, wake it up. */
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egalax_wake_up_device(client);
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ret = egalax_firmware_version(client);
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if (ret < 0) {
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dev_err(&client->dev, "Failed to read firmware version\n");
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error = -EIO;
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goto err_free_dev;
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}
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input_dev->name = "EETI eGalax Touch Screen";
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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, EGALAX_MAX_X, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0);
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input_set_abs_params(input_dev,
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ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0);
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input_set_abs_params(input_dev,
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ABS_MT_POSITION_X, 0, EGALAX_MAX_Y, 0, 0);
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input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS);
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input_set_drvdata(input_dev, ts);
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error = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"egalax_ts", ts);
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if (error < 0) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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goto err_free_dev;
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}
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error = input_register_device(ts->input_dev);
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if (error)
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goto err_free_irq;
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i2c_set_clientdata(client, ts);
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return 0;
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err_free_irq:
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free_irq(client->irq, ts);
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err_free_dev:
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input_free_device(input_dev);
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err_free_ts:
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kfree(ts);
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return error;
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}
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static __devexit int egalax_ts_remove(struct i2c_client *client)
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{
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struct egalax_ts *ts = i2c_get_clientdata(client);
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free_irq(client->irq, ts);
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input_unregister_device(ts->input_dev);
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kfree(ts);
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return 0;
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}
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static const struct i2c_device_id egalax_ts_id[] = {
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{ "egalax_ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
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#ifdef CONFIG_PM_SLEEP
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static int egalax_ts_suspend(struct device *dev)
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{
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static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = {
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0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0
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};
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struct i2c_client *client = to_i2c_client(dev);
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int ret;
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ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
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return ret > 0 ? 0 : ret;
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}
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static int egalax_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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return egalax_wake_up_device(client);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
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static struct i2c_driver egalax_ts_driver = {
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.driver = {
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.name = "egalax_ts",
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.owner = THIS_MODULE,
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.pm = &egalax_ts_pm_ops,
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},
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.id_table = egalax_ts_id,
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.probe = egalax_ts_probe,
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.remove = __devexit_p(egalax_ts_remove),
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};
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static int __init egalax_ts_init(void)
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{
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return i2c_add_driver(&egalax_ts_driver);
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}
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static void __exit egalax_ts_exit(void)
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{
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i2c_del_driver(&egalax_ts_driver);
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}
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module_init(egalax_ts_init);
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module_exit(egalax_ts_exit);
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MODULE_AUTHOR("Freescale Semiconductor, Inc.");
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MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
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MODULE_LICENSE("GPL");
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