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434 lines
13 KiB
434 lines
13 KiB
From 75a6299867667a481a12f3c833322e39ff4fb089 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Fri, 2 Oct 2015 11:30:11 -0700
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Subject: [PATCH 205/222] Input: add support for FocalTech FT6236 touchscreen
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controller
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This adds support for the FT6x06 and the FT6x36 family of capacitive touch
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panel controllers, in particular the FT6236.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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.../input/touchscreen/focaltech-ft6236.txt | 35 +++
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.../devicetree/bindings/vendor-prefixes.txt | 1 +
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drivers/input/touchscreen/Kconfig | 13 +
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drivers/input/touchscreen/Makefile | 1 +
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drivers/input/touchscreen/ft6236.c | 327 +++++++++++++++++++++
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5 files changed, 377 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
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create mode 100644 drivers/input/touchscreen/ft6236.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
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@@ -0,0 +1,35 @@
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+* FocalTech FT6236 I2C touchscreen controller
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+
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+Required properties:
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+ - compatible : "focaltech,ft6236"
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+ - reg : I2C slave address of the chip (0x38)
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+ - interrupt-parent : a phandle pointing to the interrupt controller
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+ serving the interrupt for this chip
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+ - interrupts : interrupt specification for the touch controller
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+ interrupt
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+ - reset-gpios : GPIO specification for the RSTN input
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+ - touchscreen-size-x : horizontal resolution of touchscreen (in pixels)
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+ - touchscreen-size-y : vertical resolution of touchscreen (in pixels)
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+
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+Optional properties:
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+ - touchscreen-fuzz-x : horizontal noise value of the absolute input
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+ device (in pixels)
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+ - touchscreen-fuzz-y : vertical noise value of the absolute input
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+ device (in pixels)
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+ - touchscreen-inverted-x : X axis is inverted (boolean)
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+ - touchscreen-inverted-y : Y axis is inverted (boolean)
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+ - touchscreen-swapped-x-y: X and Y axis are swapped (boolean)
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+ Swapping is done after inverting the axis
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+
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+Example:
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+
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+ ft6x06@38 {
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+ compatible = "focaltech,ft6236";
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+ reg = <0x38>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <23 2>;
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+ touchscreen-size-x = <320>;
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+ touchscreen-size-y = <480>;
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+ touchscreen-inverted-x;
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+ touchscreen-swapped-x-y;
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+ };
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--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
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+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
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@@ -76,6 +76,7 @@ everspin Everspin Technologies, Inc.
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excito Excito
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fcs Fairchild Semiconductor
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firefly Firefly
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+focaltech FocalTech Systems Co.,Ltd
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fsl Freescale Semiconductor
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GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc.
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gef GE Fanuc Intelligent Platforms Embedded Systems, Inc.
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -295,6 +295,19 @@ config TOUCHSCREEN_EGALAX
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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_FT6236
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+ tristate "FT6236 I2C touchscreen"
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+ depends on I2C
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+ depends on GPIOLIB || COMPILE_TEST
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+ help
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+ Say Y here to enable support for the I2C connected FT6x06 and
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+ FT6x36 family of capacitive touchscreen drivers.
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+
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+ If unsure, say N.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called ft6236.
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+
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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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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_
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obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.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-$(CONFIG_TOUCHSCREEN_FT6236) += ft6236.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
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obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
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--- /dev/null
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+++ b/drivers/input/touchscreen/ft6236.c
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@@ -0,0 +1,327 @@
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+/*
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+ * FocalTech FT6236 TouchScreen driver.
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+ *
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+ * Copyright (c) 2010 Focal tech Ltd.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/i2c.h>
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+#include <linux/input.h>
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+#include <linux/input/mt.h>
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+#include <linux/interrupt.h>
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+#include <linux/module.h>
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+#include <linux/property.h>
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+
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+#define FT6236_MAX_TOUCH_POINTS 2
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+
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+#define FT6236_REG_TH_GROUP 0x80
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+#define FT6236_REG_PERIODACTIVE 0x88
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+#define FT6236_REG_LIB_VER_H 0xa1
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+#define FT6236_REG_LIB_VER_L 0xa2
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+#define FT6236_REG_CIPHER 0xa3
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+#define FT6236_REG_FIRMID 0xa6
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+#define FT6236_REG_FOCALTECH_ID 0xa8
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+#define FT6236_REG_RELEASE_CODE_ID 0xaf
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+
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+#define FT6236_EVENT_PRESS_DOWN 0
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+#define FT6236_EVENT_LIFT_UP 1
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+#define FT6236_EVENT_CONTACT 2
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+#define FT6236_EVENT_NO_EVENT 3
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+
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+struct ft6236_data {
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+ struct i2c_client *client;
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+ struct input_dev *input;
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+ struct gpio_desc *reset_gpio;
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+ u32 max_x;
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+ u32 max_y;
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+ bool invert_x;
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+ bool invert_y;
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+ bool swap_xy;
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+};
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+
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+/*
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+ * This struct is a touchpoint as stored in hardware. Note that the id,
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+ * as well as the event, are stored in the upper nybble of the hi byte.
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+ */
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+struct ft6236_touchpoint {
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+ union {
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+ u8 xhi;
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+ u8 event;
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+ };
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+ u8 xlo;
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+ union {
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+ u8 yhi;
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+ u8 id;
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+ };
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+ u8 ylo;
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+ u8 weight;
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+ u8 misc;
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+} __packed;
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+
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+/* This packet represents the register map as read from offset 0 */
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+struct ft6236_packet {
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+ u8 dev_mode;
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+ u8 gest_id;
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+ u8 touches;
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+ struct ft6236_touchpoint points[FT6236_MAX_TOUCH_POINTS];
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+} __packed;
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+
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+static int ft6236_read(struct i2c_client *client, u8 reg, u8 len, void *data)
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+{
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+ int error;
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+
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+ error = i2c_smbus_read_i2c_block_data(client, reg, len, data);
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+ if (error < 0)
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+ return error;
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+
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+ if (error != len)
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+ return -EIO;
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+
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+ return 0;
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+}
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+
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+static irqreturn_t ft6236_interrupt(int irq, void *dev_id)
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+{
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+ struct ft6236_data *ft6236 = dev_id;
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+ struct device *dev = &ft6236->client->dev;
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+ struct input_dev *input = ft6236->input;
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+ struct ft6236_packet buf;
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+ u8 touches;
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+ int i, error;
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+
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+ error = ft6236_read(ft6236->client, 0, sizeof(buf), &buf);
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+ if (error) {
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+ dev_err(dev, "read touchdata failed %d\n", error);
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+ return IRQ_HANDLED;
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+ }
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+
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+ touches = buf.touches & 0xf;
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+ if (touches > FT6236_MAX_TOUCH_POINTS) {
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+ dev_dbg(dev,
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+ "%d touch points reported, only %d are supported\n",
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+ touches, FT6236_MAX_TOUCH_POINTS);
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+ touches = FT6236_MAX_TOUCH_POINTS;
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+ }
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+
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+ for (i = 0; i < touches; i++) {
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+ struct ft6236_touchpoint *point = &buf.points[i];
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+ u16 x = ((point->xhi & 0xf) << 8) | buf.points[i].xlo;
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+ u16 y = ((point->yhi & 0xf) << 8) | buf.points[i].ylo;
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+ u8 event = point->event >> 6;
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+ u8 id = point->id >> 4;
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+ bool act = (event == FT6236_EVENT_PRESS_DOWN ||
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+ event == FT6236_EVENT_CONTACT);
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+
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+ input_mt_slot(input, id);
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+ input_mt_report_slot_state(input, MT_TOOL_FINGER, act);
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+ if (!act)
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+ continue;
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+
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+ if (ft6236->invert_x)
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+ x = ft6236->max_x - x;
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+
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+ if (ft6236->invert_y)
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+ y = ft6236->max_y - y;
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+
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+ if (ft6236->swap_xy) {
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+ input_report_abs(input, ABS_MT_POSITION_X, y);
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+ input_report_abs(input, ABS_MT_POSITION_Y, x);
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+ } else {
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+ input_report_abs(input, ABS_MT_POSITION_X, x);
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+ input_report_abs(input, ABS_MT_POSITION_Y, y);
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+ }
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+ }
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+
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+ input_mt_sync_frame(input);
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+ input_sync(input);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static u8 ft6236_debug_read_byte(struct ft6236_data *ft6236, u8 reg)
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+{
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+ struct i2c_client *client = ft6236->client;
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+ u8 val = 0;
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+ int error;
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+
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+ error = ft6236_read(client, reg, 1, &val);
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+ if (error)
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+ dev_dbg(&client->dev,
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+ "error reading register 0x%02x: %d\n", reg, error);
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+
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+ return val;
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+}
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+
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+static void ft6236_debug_info(struct ft6236_data *ft6236)
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+{
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+ struct device *dev = &ft6236->client->dev;
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+
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+ dev_dbg(dev, "Touch threshold is %d\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_TH_GROUP) * 4);
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+ dev_dbg(dev, "Report rate is %dHz\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_PERIODACTIVE) * 10);
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+ dev_dbg(dev, "Firmware library version 0x%02x%02x\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_H),
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_L));
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+ dev_dbg(dev, "Firmware version 0x%02x\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_FIRMID));
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+ dev_dbg(dev, "Chip vendor ID 0x%02x\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_CIPHER));
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+ dev_dbg(dev, "CTPM vendor ID 0x%02x\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_FOCALTECH_ID));
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+ dev_dbg(dev, "Release code version 0x%02x\n",
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+ ft6236_debug_read_byte(ft6236, FT6236_REG_RELEASE_CODE_ID));
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+}
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+
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+static void ft6236_reset(struct ft6236_data *ft6236)
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+{
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+ if (!ft6236->reset_gpio)
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+ return;
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+
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+ gpiod_set_value_cansleep(ft6236->reset_gpio, 1);
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+ usleep_range(5000, 20000);
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+ gpiod_set_value_cansleep(ft6236->reset_gpio, 0);
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+ msleep(300);
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+}
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+
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+static int ft6236_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ struct device *dev = &client->dev;
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+ struct ft6236_data *ft6236;
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+ struct input_dev *input;
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+ u32 fuzz_x = 0, fuzz_y = 0;
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+ u8 val;
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+ int error;
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+
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+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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+ return -ENXIO;
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+
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+ if (!client->irq) {
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+ dev_err(dev, "irq is missing\n");
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+ return -EINVAL;
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+ }
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+
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+ ft6236 = devm_kzalloc(dev, sizeof(*ft6236), GFP_KERNEL);
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+ if (!ft6236)
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+ return -ENOMEM;
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+
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+ ft6236->client = client;
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+ ft6236->reset_gpio = devm_gpiod_get_optional(dev, "reset",
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+ GPIOD_OUT_LOW);
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+ if (IS_ERR(ft6236->reset_gpio)) {
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+ error = PTR_ERR(ft6236->reset_gpio);
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+ if (error != -EPROBE_DEFER)
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+ dev_err(dev, "error getting reset gpio: %d\n", error);
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+ return error;
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+ }
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+
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+ ft6236_reset(ft6236);
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+
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+ /* verify that the controller is present */
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+ error = ft6236_read(client, 0x00, 1, &val);
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+ if (error) {
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+ dev_err(dev, "failed to read from controller: %d\n", error);
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+ return error;
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+ }
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+
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+ ft6236_debug_info(ft6236);
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+
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+ input = devm_input_allocate_device(dev);
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+ if (!input)
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+ return -ENOMEM;
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+
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+ ft6236->input = input;
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+ input->name = client->name;
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+ input->id.bustype = BUS_I2C;
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+
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+ if (device_property_read_u32(dev, "touchscreen-size-x",
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+ &ft6236->max_x) ||
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+ device_property_read_u32(dev, "touchscreen-size-y",
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+ &ft6236->max_y)) {
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+ dev_err(dev, "touchscreen-size-x and/or -y missing\n");
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+ return -EINVAL;
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+ }
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+
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+ device_property_read_u32(dev, "touchscreen-fuzz-x", &fuzz_x);
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+ device_property_read_u32(dev, "touchscreen-fuzz-y", &fuzz_y);
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+ ft6236->invert_x = device_property_read_bool(dev,
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+ "touchscreen-inverted-x");
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+ ft6236->invert_y = device_property_read_bool(dev,
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+ "touchscreen-inverted-y");
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+ ft6236->swap_xy = device_property_read_bool(dev,
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+ "touchscreen-swapped-x-y");
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+
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+ if (ft6236->swap_xy) {
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+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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+ ft6236->max_y, fuzz_y, 0);
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+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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+ ft6236->max_x, fuzz_x, 0);
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+ } else {
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+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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+ ft6236->max_x, fuzz_x, 0);
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+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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+ ft6236->max_y, fuzz_y, 0);
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+ }
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+
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+ error = input_mt_init_slots(input, FT6236_MAX_TOUCH_POINTS,
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+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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+ if (error)
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+ return error;
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+
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+ error = devm_request_threaded_irq(dev, client->irq, NULL,
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+ ft6236_interrupt, IRQF_ONESHOT,
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+ client->name, ft6236);
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+ if (error) {
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+ dev_err(dev, "request irq %d failed: %d\n", client->irq, error);
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+ return error;
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+ }
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+
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+ error = input_register_device(input);
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+ if (error) {
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+ dev_err(dev, "failed to register input device: %d\n", error);
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+ return error;
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+ }
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_OF
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+static const struct of_device_id ft6236_of_match[] = {
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+ { .compatible = "focaltech,ft6236", },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, ft6236_of_match);
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+#endif
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+
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+static const struct i2c_device_id ft6236_id[] = {
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+ { "ft6236", },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, ft6236_id);
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+
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+static struct i2c_driver ft6236_driver = {
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+ .driver = {
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+ .name = "ft6236",
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+ .owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(ft6236_of_match),
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+ },
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+ .probe = ft6236_probe,
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+ .id_table = ft6236_id,
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+};
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+module_i2c_driver(ft6236_driver);
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+
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+MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
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+MODULE_AUTHOR("Noralf Trønnes <noralf@tronnes.org>");
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+MODULE_DESCRIPTION("FocalTech FT6236 TouchScreen driver");
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+MODULE_LICENSE("GPL");
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