Commit 92deea13 authored by Noralf Trønnes's avatar Noralf Trønnes Committed by Dmitry Torokhov

Input: add support for FocalTech FT6236 touchscreen controller

This adds support for the FT6x06 and the FT6x36 family of capacitive touch
panel controllers, in particular the FT6236.
Signed-off-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent d6f0c3d3
* FocalTech FT6236 I2C touchscreen controller
Required properties:
- compatible : "focaltech,ft6236"
- reg : I2C slave address of the chip (0x38)
- interrupt-parent : a phandle pointing to the interrupt controller
serving the interrupt for this chip
- interrupts : interrupt specification for the touch controller
interrupt
- reset-gpios : GPIO specification for the RSTN input
- touchscreen-size-x : horizontal resolution of touchscreen (in pixels)
- touchscreen-size-y : vertical resolution of touchscreen (in pixels)
Optional properties:
- touchscreen-fuzz-x : horizontal noise value of the absolute input
device (in pixels)
- touchscreen-fuzz-y : vertical noise value of the absolute input
device (in pixels)
- touchscreen-inverted-x : X axis is inverted (boolean)
- touchscreen-inverted-y : Y axis is inverted (boolean)
- touchscreen-swapped-x-y: X and Y axis are swapped (boolean)
Swapping is done after inverting the axis
Example:
ft6x06@38 {
compatible = "focaltech,ft6236";
reg = <0x38>;
interrupt-parent = <&gpio>;
interrupts = <23 2>;
touchscreen-size-x = <320>;
touchscreen-size-y = <480>;
touchscreen-inverted-x;
touchscreen-swapped-x-y;
};
...@@ -82,6 +82,7 @@ everspin Everspin Technologies, Inc. ...@@ -82,6 +82,7 @@ everspin Everspin Technologies, Inc.
excito Excito excito Excito
fcs Fairchild Semiconductor fcs Fairchild Semiconductor
firefly Firefly firefly Firefly
focaltech FocalTech Systems Co.,Ltd
fsl Freescale Semiconductor fsl Freescale Semiconductor
GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc. GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc.
gef GE Fanuc Intelligent Platforms Embedded Systems, Inc. gef GE Fanuc Intelligent Platforms Embedded Systems, Inc.
......
...@@ -295,6 +295,19 @@ config TOUCHSCREEN_EGALAX ...@@ -295,6 +295,19 @@ config TOUCHSCREEN_EGALAX
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called egalax_ts. module will be called egalax_ts.
config TOUCHSCREEN_FT6236
tristate "FT6236 I2C touchscreen"
depends on I2C
depends on GPIOLIB || COMPILE_TEST
help
Say Y here to enable support for the I2C connected FT6x06 and
FT6x36 family of capacitive touchscreen drivers.
If unsure, say N.
To compile this driver as a module, choose M here: the
module will be called ft6236.
config TOUCHSCREEN_FUJITSU config TOUCHSCREEN_FUJITSU
tristate "Fujitsu serial touchscreen" tristate "Fujitsu serial touchscreen"
select SERIO select SERIO
......
...@@ -35,6 +35,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o ...@@ -35,6 +35,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.o obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.o
obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
obj-$(CONFIG_TOUCHSCREEN_FT6236) += ft6236.o
obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
......
/*
* FocalTech FT6236 TouchScreen driver.
*
* Copyright (c) 2010 Focal tech Ltd.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/property.h>
#define FT6236_MAX_TOUCH_POINTS 2
#define FT6236_REG_TH_GROUP 0x80
#define FT6236_REG_PERIODACTIVE 0x88
#define FT6236_REG_LIB_VER_H 0xa1
#define FT6236_REG_LIB_VER_L 0xa2
#define FT6236_REG_CIPHER 0xa3
#define FT6236_REG_FIRMID 0xa6
#define FT6236_REG_FOCALTECH_ID 0xa8
#define FT6236_REG_RELEASE_CODE_ID 0xaf
#define FT6236_EVENT_PRESS_DOWN 0
#define FT6236_EVENT_LIFT_UP 1
#define FT6236_EVENT_CONTACT 2
#define FT6236_EVENT_NO_EVENT 3
struct ft6236_data {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *reset_gpio;
u32 max_x;
u32 max_y;
bool invert_x;
bool invert_y;
bool swap_xy;
};
/*
* This struct is a touchpoint as stored in hardware. Note that the id,
* as well as the event, are stored in the upper nybble of the hi byte.
*/
struct ft6236_touchpoint {
union {
u8 xhi;
u8 event;
};
u8 xlo;
union {
u8 yhi;
u8 id;
};
u8 ylo;
u8 weight;
u8 misc;
} __packed;
/* This packet represents the register map as read from offset 0 */
struct ft6236_packet {
u8 dev_mode;
u8 gest_id;
u8 touches;
struct ft6236_touchpoint points[FT6236_MAX_TOUCH_POINTS];
} __packed;
static int ft6236_read(struct i2c_client *client, u8 reg, u8 len, void *data)
{
int error;
error = i2c_smbus_read_i2c_block_data(client, reg, len, data);
if (error < 0)
return error;
if (error != len)
return -EIO;
return 0;
}
static irqreturn_t ft6236_interrupt(int irq, void *dev_id)
{
struct ft6236_data *ft6236 = dev_id;
struct device *dev = &ft6236->client->dev;
struct input_dev *input = ft6236->input;
struct ft6236_packet buf;
u8 touches;
int i, error;
error = ft6236_read(ft6236->client, 0, sizeof(buf), &buf);
if (error) {
dev_err(dev, "read touchdata failed %d\n", error);
return IRQ_HANDLED;
}
touches = buf.touches & 0xf;
if (touches > FT6236_MAX_TOUCH_POINTS) {
dev_dbg(dev,
"%d touch points reported, only %d are supported\n",
touches, FT6236_MAX_TOUCH_POINTS);
touches = FT6236_MAX_TOUCH_POINTS;
}
for (i = 0; i < touches; i++) {
struct ft6236_touchpoint *point = &buf.points[i];
u16 x = ((point->xhi & 0xf) << 8) | buf.points[i].xlo;
u16 y = ((point->yhi & 0xf) << 8) | buf.points[i].ylo;
u8 event = point->event >> 6;
u8 id = point->id >> 4;
bool act = (event == FT6236_EVENT_PRESS_DOWN ||
event == FT6236_EVENT_CONTACT);
input_mt_slot(input, id);
input_mt_report_slot_state(input, MT_TOOL_FINGER, act);
if (!act)
continue;
if (ft6236->invert_x)
x = ft6236->max_x - x;
if (ft6236->invert_y)
y = ft6236->max_y - y;
if (ft6236->swap_xy) {
input_report_abs(input, ABS_MT_POSITION_X, y);
input_report_abs(input, ABS_MT_POSITION_Y, x);
} else {
input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y);
}
}
input_mt_sync_frame(input);
input_sync(input);
return IRQ_HANDLED;
}
static u8 ft6236_debug_read_byte(struct ft6236_data *ft6236, u8 reg)
{
struct i2c_client *client = ft6236->client;
u8 val = 0;
int error;
error = ft6236_read(client, reg, 1, &val);
if (error)
dev_dbg(&client->dev,
"error reading register 0x%02x: %d\n", reg, error);
return val;
}
static void ft6236_debug_info(struct ft6236_data *ft6236)
{
struct device *dev = &ft6236->client->dev;
dev_dbg(dev, "Touch threshold is %d\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_TH_GROUP) * 4);
dev_dbg(dev, "Report rate is %dHz\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_PERIODACTIVE) * 10);
dev_dbg(dev, "Firmware library version 0x%02x%02x\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_H),
ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_L));
dev_dbg(dev, "Firmware version 0x%02x\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_FIRMID));
dev_dbg(dev, "Chip vendor ID 0x%02x\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_CIPHER));
dev_dbg(dev, "CTPM vendor ID 0x%02x\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_FOCALTECH_ID));
dev_dbg(dev, "Release code version 0x%02x\n",
ft6236_debug_read_byte(ft6236, FT6236_REG_RELEASE_CODE_ID));
}
static void ft6236_reset(struct ft6236_data *ft6236)
{
if (!ft6236->reset_gpio)
return;
gpiod_set_value_cansleep(ft6236->reset_gpio, 1);
usleep_range(5000, 20000);
gpiod_set_value_cansleep(ft6236->reset_gpio, 0);
msleep(300);
}
static int ft6236_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct ft6236_data *ft6236;
struct input_dev *input;
u32 fuzz_x = 0, fuzz_y = 0;
u8 val;
int error;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENXIO;
if (!client->irq) {
dev_err(dev, "irq is missing\n");
return -EINVAL;
}
ft6236 = devm_kzalloc(dev, sizeof(*ft6236), GFP_KERNEL);
if (!ft6236)
return -ENOMEM;
ft6236->client = client;
ft6236->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(ft6236->reset_gpio)) {
error = PTR_ERR(ft6236->reset_gpio);
if (error != -EPROBE_DEFER)
dev_err(dev, "error getting reset gpio: %d\n", error);
return error;
}
ft6236_reset(ft6236);
/* verify that the controller is present */
error = ft6236_read(client, 0x00, 1, &val);
if (error) {
dev_err(dev, "failed to read from controller: %d\n", error);
return error;
}
ft6236_debug_info(ft6236);
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
ft6236->input = input;
input->name = client->name;
input->id.bustype = BUS_I2C;
if (device_property_read_u32(dev, "touchscreen-size-x",
&ft6236->max_x) ||
device_property_read_u32(dev, "touchscreen-size-y",
&ft6236->max_y)) {
dev_err(dev, "touchscreen-size-x and/or -y missing\n");
return -EINVAL;
}
device_property_read_u32(dev, "touchscreen-fuzz-x", &fuzz_x);
device_property_read_u32(dev, "touchscreen-fuzz-y", &fuzz_y);
ft6236->invert_x = device_property_read_bool(dev,
"touchscreen-inverted-x");
ft6236->invert_y = device_property_read_bool(dev,
"touchscreen-inverted-y");
ft6236->swap_xy = device_property_read_bool(dev,
"touchscreen-swapped-x-y");
if (ft6236->swap_xy) {
input_set_abs_params(input, ABS_MT_POSITION_X, 0,
ft6236->max_y, fuzz_y, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
ft6236->max_x, fuzz_x, 0);
} else {
input_set_abs_params(input, ABS_MT_POSITION_X, 0,
ft6236->max_x, fuzz_x, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
ft6236->max_y, fuzz_y, 0);
}
error = input_mt_init_slots(input, FT6236_MAX_TOUCH_POINTS,
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
if (error)
return error;
error = devm_request_threaded_irq(dev, client->irq, NULL,
ft6236_interrupt, IRQF_ONESHOT,
client->name, ft6236);
if (error) {
dev_err(dev, "request irq %d failed: %d\n", client->irq, error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(dev, "failed to register input device: %d\n", error);
return error;
}
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id ft6236_of_match[] = {
{ .compatible = "focaltech,ft6236", },
{ }
};
MODULE_DEVICE_TABLE(of, ft6236_of_match);
#endif
static const struct i2c_device_id ft6236_id[] = {
{ "ft6236", },
{ }
};
MODULE_DEVICE_TABLE(i2c, ft6236_id);
static struct i2c_driver ft6236_driver = {
.driver = {
.name = "ft6236",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ft6236_of_match),
},
.probe = ft6236_probe,
.id_table = ft6236_id,
};
module_i2c_driver(ft6236_driver);
MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
MODULE_AUTHOR("Noralf Trønnes <noralf@tronnes.org>");
MODULE_DESCRIPTION("FocalTech FT6236 TouchScreen driver");
MODULE_LICENSE("GPL");
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