--- /dev/null
+From 75a6299867667a481a12f3c833322e39ff4fb089 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
+Date: Fri, 2 Oct 2015 11:30:11 -0700
+Subject: [PATCH 205/222] Input: add support for FocalTech FT6236 touchscreen
+ controller
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This adds support for the FT6x06 and the FT6x36 family of capacitive touch
+panel controllers, in particular the FT6236.
+
+Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
+Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
+---
+ .../input/touchscreen/focaltech-ft6236.txt | 35 +++
+ .../devicetree/bindings/vendor-prefixes.txt | 1 +
+ drivers/input/touchscreen/Kconfig | 13 +
+ drivers/input/touchscreen/Makefile | 1 +
+ drivers/input/touchscreen/ft6236.c | 327 +++++++++++++++++++++
+ 5 files changed, 377 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
+ create mode 100644 drivers/input/touchscreen/ft6236.c
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
+@@ -0,0 +1,35 @@
++* 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;
++ };
+--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
++++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
+@@ -76,6 +76,7 @@ everspin Everspin Technologies, Inc.
+ excito Excito
+ fcs Fairchild Semiconductor
+ firefly Firefly
++focaltech FocalTech Systems Co.,Ltd
+ fsl Freescale Semiconductor
+ GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+ gef GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+--- a/drivers/input/touchscreen/Kconfig
++++ b/drivers/input/touchscreen/Kconfig
+@@ -295,6 +295,19 @@ config TOUCHSCREEN_EGALAX
+ To compile this driver as a module, choose M here: the
+ 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
+ tristate "Fujitsu serial touchscreen"
+ select SERIO
+--- a/drivers/input/touchscreen/Makefile
++++ b/drivers/input/touchscreen/Makefile
+@@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_
+ obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.o
+ obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
+ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
++obj-$(CONFIG_TOUCHSCREEN_FT6236) += ft6236.o
+ obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
+ obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
+--- /dev/null
++++ b/drivers/input/touchscreen/ft6236.c
+@@ -0,0 +1,327 @@
++/*
++ * 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");
projects / openwrt.git / blobdiff