Input: add support for ChipOne icn8318 based touchscreens
The ChipOne icn8318 is an i2c capacitive touchscreen controller typically used in cheap android tablets, this commit adds a driver for it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede
Dmitry Torokhov
parent
d16a33bb94
commit
a93ad65d37
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@ -0,0 +1,46 @@
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* ChipOne icn8318 I2C touchscreen controller
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Required properties:
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- compatible : "chipone,icn8318"
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- reg : I2C slave address of the chip (0x40)
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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 icn8318 interrupt
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- wake-gpios : GPIO specification for the WAKE 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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Optional properties:
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- pinctrl-names : should be "default"
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- pinctrl-0: : a phandle pointing to the pin settings for the
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control gpios
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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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Example:
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i2c@00000000 {
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/* ... */
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chipone_icn8318@40 {
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compatible = "chipone,icn8318";
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reg = <0x40>;
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interrupt-parent = <&pio>;
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interrupts = <9 IRQ_TYPE_EDGE_FALLING>; /* EINT9 (PG9) */
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pinctrl-names = "default";
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pinctrl-0 = <&ts_wake_pin_p66>;
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wake-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>; /* PB3 */
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touchscreen-size-x = <800>;
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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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/* ... */
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};
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@ -37,6 +37,7 @@ capella Capella Microsystems, Inc
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cavium Cavium, Inc.
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cdns Cadence Design Systems Inc.
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chipidea Chipidea, Inc
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chipone ChipOne
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chipspark ChipSPARK
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chrp Common Hardware Reference Platform
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chunghwa Chunghwa Picture Tubes Ltd.
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@ -2523,6 +2523,13 @@ L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/chipidea/
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CHIPONE ICN8318 I2C TOUCHSCREEN DRIVER
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M: Hans de Goede <hdegoede@redhat.com>
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L: linux-input@vger.kernel.org
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S: Maintained
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F: Documentation/devicetree/bindings/input/touchscreen/chipone_icn8318.txt
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F: drivers/input/touchscreen/chipone_icn8318.c
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CHROME HARDWARE PLATFORM SUPPORT
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M: Olof Johansson <olof@lixom.net>
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S: Maintained
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@ -140,6 +140,19 @@ config TOUCHSCREEN_BU21013
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To compile this driver as a module, choose M here: the
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module will be called bu21013_ts.
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config TOUCHSCREEN_CHIPONE_ICN8318
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tristate "chipone icn8318 touchscreen controller"
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depends on GPIOLIB
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depends on I2C
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depends on OF
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help
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Say Y here if you have a ChipOne icn8318 based I2C touchscreen.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called chipone_icn8318.
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config TOUCHSCREEN_CY8CTMG110
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tristate "cy8ctmg110 touchscreen"
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depends on I2C
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@ -17,6 +17,7 @@ obj-$(CONFIG_TOUCHSCREEN_AR1021_I2C) += ar1021_i2c.o
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obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT) += atmel_mxt_ts.o
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obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR) += auo-pixcir-ts.o
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obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o
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obj-$(CONFIG_TOUCHSCREEN_CHIPONE_ICN8318) += chipone_icn8318.o
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obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o
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obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE) += cyttsp_core.o
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obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C) += cyttsp_i2c.o cyttsp_i2c_common.o
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@ -0,0 +1,316 @@
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/*
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* Driver for ChipOne icn8318 i2c touchscreen controller
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*
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* Copyright (c) 2015 Red Hat Inc.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Red Hat authors:
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* Hans de Goede <hdegoede@redhat.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.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/module.h>
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#include <linux/of.h>
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#define ICN8318_REG_POWER 4
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#define ICN8318_REG_TOUCHDATA 16
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#define ICN8318_POWER_ACTIVE 0
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#define ICN8318_POWER_MONITOR 1
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#define ICN8318_POWER_HIBERNATE 2
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#define ICN8318_MAX_TOUCHES 5
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struct icn8318_touch {
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__u8 slot;
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__be16 x;
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__be16 y;
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__u8 pressure; /* Seems more like finger width then pressure really */
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__u8 event;
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/* The difference between 2 and 3 is unclear */
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#define ICN8318_EVENT_NO_DATA 1 /* No finger seen yet since wakeup */
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#define ICN8318_EVENT_UPDATE1 2 /* New or updated coordinates */
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#define ICN8318_EVENT_UPDATE2 3 /* New or updated coordinates */
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#define ICN8318_EVENT_END 4 /* Finger lifted */
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} __packed;
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struct icn8318_touch_data {
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__u8 softbutton;
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__u8 touch_count;
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struct icn8318_touch touches[ICN8318_MAX_TOUCHES];
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} __packed;
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struct icn8318_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct gpio_desc *wake_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_x_y;
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};
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static int icn8318_read_touch_data(struct i2c_client *client,
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struct icn8318_touch_data *touch_data)
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{
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u8 reg = ICN8318_REG_TOUCHDATA;
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struct i2c_msg msg[2] = {
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{
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.addr = client->addr,
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.len = 1,
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.buf = ®
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = sizeof(struct icn8318_touch_data),
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.buf = (u8 *)touch_data
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}
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};
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return i2c_transfer(client->adapter, msg, 2);
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}
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static inline bool icn8318_touch_active(u8 event)
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{
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return (event == ICN8318_EVENT_UPDATE1) ||
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(event == ICN8318_EVENT_UPDATE2);
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}
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static irqreturn_t icn8318_irq(int irq, void *dev_id)
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{
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struct icn8318_data *data = dev_id;
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struct device *dev = &data->client->dev;
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struct icn8318_touch_data touch_data;
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int i, ret, x, y;
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ret = icn8318_read_touch_data(data->client, &touch_data);
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if (ret < 0) {
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dev_err(dev, "Error reading touch data: %d\n", ret);
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return IRQ_HANDLED;
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}
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if (touch_data.softbutton) {
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/*
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* Other data is invalid when a softbutton is pressed.
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* This needs some extra devicetree bindings to map the icn8318
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* softbutton codes to evdev codes. Currently no known devices
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* use this.
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*/
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return IRQ_HANDLED;
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}
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if (touch_data.touch_count > ICN8318_MAX_TOUCHES) {
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dev_warn(dev, "Too much touches %d > %d\n",
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touch_data.touch_count, ICN8318_MAX_TOUCHES);
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touch_data.touch_count = ICN8318_MAX_TOUCHES;
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}
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for (i = 0; i < touch_data.touch_count; i++) {
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struct icn8318_touch *touch = &touch_data.touches[i];
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bool act = icn8318_touch_active(touch->event);
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input_mt_slot(data->input, touch->slot);
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input_mt_report_slot_state(data->input, MT_TOOL_FINGER, act);
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if (!act)
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continue;
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x = be16_to_cpu(touch->x);
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y = be16_to_cpu(touch->y);
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if (data->invert_x)
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x = data->max_x - x;
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if (data->invert_y)
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y = data->max_y - y;
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if (!data->swap_x_y) {
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input_event(data->input, EV_ABS, ABS_MT_POSITION_X, x);
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input_event(data->input, EV_ABS, ABS_MT_POSITION_Y, y);
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} else {
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input_event(data->input, EV_ABS, ABS_MT_POSITION_X, y);
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input_event(data->input, EV_ABS, ABS_MT_POSITION_Y, x);
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}
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}
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input_mt_sync_frame(data->input);
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input_sync(data->input);
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return IRQ_HANDLED;
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}
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static int icn8318_start(struct input_dev *dev)
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{
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struct icn8318_data *data = input_get_drvdata(dev);
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enable_irq(data->client->irq);
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gpiod_set_value_cansleep(data->wake_gpio, 1);
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return 0;
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}
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static void icn8318_stop(struct input_dev *dev)
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{
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struct icn8318_data *data = input_get_drvdata(dev);
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disable_irq(data->client->irq);
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i2c_smbus_write_byte_data(data->client, ICN8318_REG_POWER,
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ICN8318_POWER_HIBERNATE);
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gpiod_set_value_cansleep(data->wake_gpio, 0);
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}
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#ifdef CONFIG_PM_SLEEP
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static int icn8318_suspend(struct device *dev)
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{
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struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev));
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mutex_lock(&data->input->mutex);
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if (data->input->users)
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icn8318_stop(data->input);
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mutex_unlock(&data->input->mutex);
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return 0;
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}
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static int icn8318_resume(struct device *dev)
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{
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struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev));
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mutex_lock(&data->input->mutex);
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if (data->input->users)
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icn8318_start(data->input);
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mutex_unlock(&data->input->mutex);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(icn8318_pm_ops, icn8318_suspend, icn8318_resume);
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static int icn8318_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 device_node *np = dev->of_node;
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struct icn8318_data *data;
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struct input_dev *input;
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u32 fuzz_x = 0, fuzz_y = 0;
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int error;
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if (!client->irq) {
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dev_err(dev, "Error no irq specified\n");
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return -EINVAL;
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}
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->wake_gpio = devm_gpiod_get(dev, "wake", GPIOD_OUT_LOW);
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if (IS_ERR(data->wake_gpio)) {
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error = PTR_ERR(data->wake_gpio);
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if (error != -EPROBE_DEFER)
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dev_err(dev, "Error getting wake gpio: %d\n", error);
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return error;
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}
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if (of_property_read_u32(np, "touchscreen-size-x", &data->max_x) ||
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of_property_read_u32(np, "touchscreen-size-y", &data->max_y)) {
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dev_err(dev, "Error touchscreen-size-x and/or -y missing\n");
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return -EINVAL;
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}
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/* Optional */
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of_property_read_u32(np, "touchscreen-fuzz-x", &fuzz_x);
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of_property_read_u32(np, "touchscreen-fuzz-y", &fuzz_y);
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data->invert_x = of_property_read_bool(np, "touchscreen-inverted-x");
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data->invert_y = of_property_read_bool(np, "touchscreen-inverted-y");
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data->swap_x_y = of_property_read_bool(np, "touchscreen-swapped-x-y");
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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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input->name = client->name;
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input->id.bustype = BUS_I2C;
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input->open = icn8318_start;
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input->close = icn8318_stop;
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input->dev.parent = dev;
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if (!data->swap_x_y) {
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input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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data->max_x, fuzz_x, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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data->max_y, fuzz_y, 0);
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} else {
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input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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data->max_y, fuzz_y, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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data->max_x, fuzz_x, 0);
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}
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error = input_mt_init_slots(input, ICN8318_MAX_TOUCHES,
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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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data->client = client;
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data->input = input;
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input_set_drvdata(input, data);
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error = devm_request_threaded_irq(dev, client->irq, NULL, icn8318_irq,
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IRQF_ONESHOT, client->name, data);
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if (error) {
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dev_err(dev, "Error requesting irq: %d\n", error);
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return error;
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}
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/* Stop device till opened */
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icn8318_stop(data->input);
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error = input_register_device(input);
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if (error)
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return error;
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i2c_set_clientdata(client, data);
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return 0;
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}
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static const struct of_device_id icn8318_of_match[] = {
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{ .compatible = "chipone,icn8318" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, icn8318_of_match);
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/* This is useless for OF-enabled devices, but it is needed by I2C subsystem */
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static const struct i2c_device_id icn8318_i2c_id[] = {
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, icn8318_i2c_id);
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static struct i2c_driver icn8318_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "chipone_icn8318",
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.pm = &icn8318_pm_ops,
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.of_match_table = icn8318_of_match,
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},
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.probe = icn8318_probe,
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.id_table = icn8318_i2c_id,
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};
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module_i2c_driver(icn8318_driver);
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MODULE_DESCRIPTION("ChipOne icn8318 I2C Touchscreen Driver");
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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