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Input: add support for the STMicroelectronics FingerTip touchscreen
The stmfts (ST-Microelectronics FingerTip S) touchscreen device is a capacitive multi-touch controller mainly for mobile use. It's connected through i2c bus at the address 0x49 and it interfaces with userspace through input event interface. At the current state it provides a touchscreen multitouch functionality up to 10 fingers. Each finger is enumerated with a distinctive id (from 0 to 9). If enabled the device can support single "touch" hovering, by providing three coordinates, x, y and distance. It is possible to select the touchkey functionality which provides a basic two keys interface for "home" and "back" menu, typical in mobile phones. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Andi Shyti
Dmitry Torokhov
parent
131b3de701
commit
78bcac7b2a
4 changed files with 877 additions and 0 deletions
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@ -0,0 +1,43 @@
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* ST-Microelectronics FingerTip touchscreen controller
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The ST-Microelectronics FingerTip device provides a basic touchscreen
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functionality. Along with it the user can enable the touchkey which can work as
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a basic HOME and BACK key for phones.
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The driver supports also hovering as an absolute single touch event with x, y, z
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coordinates.
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Required properties:
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- compatible : must be "st,stmfts"
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- reg : I2C slave address, (e.g. 0x49)
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- interrupt-parent : the phandle to the interrupt controller which provides
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the interrupt
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- interrupts : interrupt specification
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- avdd-supply : analogic power supply
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- vdd-supply : power supply
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- touchscreen-size-x : see touchscreen.txt
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- touchscreen-size-y : see touchscreen.txt
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Optional properties:
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- touch-key-connected : specifies whether the touchkey feature is connected
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- ledvdd-supply : power supply to the touch key leds
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Example:
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i2c@00000000 {
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/* ... */
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touchscreen@49 {
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compatible = "st,stmfts";
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reg = <0x49>;
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interrupt-parent = <&gpa1>;
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interrupts = <1 IRQ_TYPE_NONE>;
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touchscreen-size-x = <1599>;
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touchscreen-size-y = <2559>;
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touch-key-connected;
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avdd-supply = <&ldo30_reg>;
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vdd-supply = <&ldo31_reg>;
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ledvdd-supply = <&ldo33_reg>;
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};
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};
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@ -1114,6 +1114,17 @@ config TOUCHSCREEN_ST1232
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To compile this driver as a module, choose M here: the
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module will be called st1232_ts.
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config TOUCHSCREEN_STMFTS
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tristate "STMicroelectronics STMFTS touchscreen"
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depends on I2C
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depends on LEDS_CLASS
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help
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Say Y here if you want support for STMicroelectronics
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STMFTS touchscreen.
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To compile this driver as a module, choose M here: the
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module will be called stmfts.
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config TOUCHSCREEN_STMPE
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tristate "STMicroelectronics STMPE touchscreens"
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depends on MFD_STMPE
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@ -67,6 +67,7 @@ obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
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obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
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obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o
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obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
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obj-$(CONFIG_TOUCHSCREEN_STMFTS) += stmfts.o
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obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUR40) += sur40.o
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822
drivers/input/touchscreen/stmfts.c
Normal file
822
drivers/input/touchscreen/stmfts.c
Normal file
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@ -0,0 +1,822 @@
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/*
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* Copyright (c) 2017 Samsung Electronics Co., Ltd.
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* Author: Andi Shyti <andi.shyti@samsung.com>
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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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* STMicroelectronics FTS Touchscreen device driver
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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/* I2C commands */
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#define STMFTS_READ_INFO 0x80
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#define STMFTS_READ_STATUS 0x84
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#define STMFTS_READ_ONE_EVENT 0x85
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#define STMFTS_READ_ALL_EVENT 0x86
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#define STMFTS_LATEST_EVENT 0x87
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#define STMFTS_SLEEP_IN 0x90
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#define STMFTS_SLEEP_OUT 0x91
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#define STMFTS_MS_MT_SENSE_OFF 0x92
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#define STMFTS_MS_MT_SENSE_ON 0x93
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#define STMFTS_SS_HOVER_SENSE_OFF 0x94
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#define STMFTS_SS_HOVER_SENSE_ON 0x95
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#define STMFTS_MS_KEY_SENSE_OFF 0x9a
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#define STMFTS_MS_KEY_SENSE_ON 0x9b
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#define STMFTS_SYSTEM_RESET 0xa0
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#define STMFTS_CLEAR_EVENT_STACK 0xa1
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#define STMFTS_FULL_FORCE_CALIBRATION 0xa2
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#define STMFTS_MS_CX_TUNING 0xa3
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#define STMFTS_SS_CX_TUNING 0xa4
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/* events */
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#define STMFTS_EV_NO_EVENT 0x00
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#define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
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#define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
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#define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
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#define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
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#define STMFTS_EV_HOVER_ENTER 0x07
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#define STMFTS_EV_HOVER_LEAVE 0x08
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#define STMFTS_EV_HOVER_MOTION 0x09
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#define STMFTS_EV_KEY_STATUS 0x0e
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#define STMFTS_EV_ERROR 0x0f
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#define STMFTS_EV_CONTROLLER_READY 0x10
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#define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
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#define STMFTS_EV_STATUS 0x16
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#define STMFTS_EV_DEBUG 0xdb
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/* multi touch related event masks */
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#define STMFTS_MASK_EVENT_ID 0x0f
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#define STMFTS_MASK_TOUCH_ID 0xf0
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#define STMFTS_MASK_LEFT_EVENT 0x0f
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#define STMFTS_MASK_X_MSB 0x0f
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#define STMFTS_MASK_Y_LSB 0xf0
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/* key related event masks */
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#define STMFTS_MASK_KEY_NO_TOUCH 0x00
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#define STMFTS_MASK_KEY_MENU 0x01
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#define STMFTS_MASK_KEY_BACK 0x02
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#define STMFTS_EVENT_SIZE 8
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#define STMFTS_STACK_DEPTH 32
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#define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
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#define STMFTS_MAX_FINGERS 10
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#define STMFTS_DEV_NAME "stmfts"
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enum stmfts_regulators {
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STMFTS_REGULATOR_VDD,
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STMFTS_REGULATOR_AVDD,
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};
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struct stmfts_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct led_classdev led_cdev;
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struct mutex mutex;
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struct touchscreen_properties prop;
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struct regulator_bulk_data regulators[2];
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/*
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* Presence of ledvdd will be used also to check
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* whether the LED is supported.
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*/
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struct regulator *ledvdd;
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u16 chip_id;
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u8 chip_ver;
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u16 fw_ver;
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u8 config_id;
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u8 config_ver;
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u8 data[STMFTS_DATA_MAX_SIZE];
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struct completion cmd_done;
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bool use_key;
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bool led_status;
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bool hover_enabled;
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bool running;
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};
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static void stmfts_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct stmfts_data *sdata = container_of(led_cdev,
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struct stmfts_data, led_cdev);
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int err;
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if (value == sdata->led_status || !sdata->ledvdd)
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return;
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if (!value) {
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regulator_disable(sdata->ledvdd);
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} else {
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err = regulator_enable(sdata->ledvdd);
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if (err)
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dev_warn(&sdata->client->dev,
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"failed to disable ledvdd regulator: %d\n",
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err);
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}
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sdata->led_status = value;
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}
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static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
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{
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struct stmfts_data *sdata = container_of(led_cdev,
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struct stmfts_data, led_cdev);
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return !!regulator_is_enabled(sdata->ledvdd);
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}
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/*
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* We can't simply use i2c_smbus_read_i2c_block_data because we
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* need to read more than 255 bytes (
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*/
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static int stmfts_read_events(struct stmfts_data *sdata)
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{
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u8 cmd = STMFTS_READ_ALL_EVENT;
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struct i2c_msg msgs[2] = {
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{
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.addr = sdata->client->addr,
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.len = 1,
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.buf = &cmd,
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},
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{
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.addr = sdata->client->addr,
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.flags = I2C_M_RD,
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.len = STMFTS_DATA_MAX_SIZE,
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.buf = sdata->data,
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},
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};
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int ret;
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ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
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}
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static void stmfts_report_contact_event(struct stmfts_data *sdata,
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const u8 event[])
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{
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u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
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u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
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u16 y = (event[2] >> 4) | (event[3] << 4);
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u8 maj = event[4];
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u8 min = event[5];
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u8 orientation = event[6];
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u8 area = event[7];
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input_mt_slot(sdata->input, slot_id);
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input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
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input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
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input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
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input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
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input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
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input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
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input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
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input_sync(sdata->input);
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}
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static void stmfts_report_contact_release(struct stmfts_data *sdata,
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const u8 event[])
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{
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u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
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input_mt_slot(sdata->input, slot_id);
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input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
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input_sync(sdata->input);
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}
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static void stmfts_report_hover_event(struct stmfts_data *sdata,
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const u8 event[])
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{
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u16 x = (event[2] << 4) | (event[4] >> 4);
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u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
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u8 z = event[5];
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input_report_abs(sdata->input, ABS_X, x);
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input_report_abs(sdata->input, ABS_Y, y);
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input_report_abs(sdata->input, ABS_DISTANCE, z);
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input_sync(sdata->input);
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}
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static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
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{
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switch (event[2]) {
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case 0:
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input_report_key(sdata->input, KEY_BACK, 0);
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input_report_key(sdata->input, KEY_MENU, 0);
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break;
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case STMFTS_MASK_KEY_BACK:
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input_report_key(sdata->input, KEY_BACK, 1);
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break;
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case STMFTS_MASK_KEY_MENU:
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input_report_key(sdata->input, KEY_MENU, 1);
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break;
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default:
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dev_warn(&sdata->client->dev,
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"unknown key event: %#02x\n", event[2]);
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break;
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}
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input_sync(sdata->input);
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}
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static void stmfts_parse_events(struct stmfts_data *sdata)
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{
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int i;
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for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
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u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
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switch (event[0]) {
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case STMFTS_EV_CONTROLLER_READY:
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case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
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case STMFTS_EV_STATUS:
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complete(&sdata->cmd_done);
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/* fall through */
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case STMFTS_EV_NO_EVENT:
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case STMFTS_EV_DEBUG:
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return;
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}
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switch (event[0] & STMFTS_MASK_EVENT_ID) {
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case STMFTS_EV_MULTI_TOUCH_ENTER:
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case STMFTS_EV_MULTI_TOUCH_MOTION:
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stmfts_report_contact_event(sdata, event);
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break;
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case STMFTS_EV_MULTI_TOUCH_LEAVE:
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stmfts_report_contact_release(sdata, event);
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break;
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case STMFTS_EV_HOVER_ENTER:
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case STMFTS_EV_HOVER_LEAVE:
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case STMFTS_EV_HOVER_MOTION:
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stmfts_report_hover_event(sdata, event);
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break;
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case STMFTS_EV_KEY_STATUS:
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stmfts_report_key_event(sdata, event);
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break;
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case STMFTS_EV_ERROR:
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dev_warn(&sdata->client->dev,
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"error code: 0x%x%x%x%x%x%x",
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event[6], event[5], event[4],
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event[3], event[2], event[1]);
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break;
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default:
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dev_err(&sdata->client->dev,
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"unknown event %#02x\n", event[0]);
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}
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}
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}
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static irqreturn_t stmfts_irq_handler(int irq, void *dev)
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{
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struct stmfts_data *sdata = dev;
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int err;
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mutex_lock(&sdata->mutex);
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err = stmfts_read_events(sdata);
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if (unlikely(err))
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dev_err(&sdata->client->dev,
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"failed to read events: %d\n", err);
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else
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stmfts_parse_events(sdata);
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mutex_unlock(&sdata->mutex);
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return IRQ_HANDLED;
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}
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static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
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{
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int err;
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reinit_completion(&sdata->cmd_done);
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err = i2c_smbus_write_byte(sdata->client, cmd);
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if (err)
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return err;
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if (!wait_for_completion_timeout(&sdata->cmd_done,
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msecs_to_jiffies(1000)))
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return -ETIMEDOUT;
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return 0;
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}
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static int stmfts_input_open(struct input_dev *dev)
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{
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struct stmfts_data *sdata = input_get_drvdata(dev);
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int err;
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err = pm_runtime_get_sync(&sdata->client->dev);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
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if (err)
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return err;
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mutex_lock(&sdata->mutex);
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sdata->running = true;
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if (sdata->hover_enabled) {
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err = i2c_smbus_write_byte(sdata->client,
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STMFTS_SS_HOVER_SENSE_ON);
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if (err)
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dev_warn(&sdata->client->dev,
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"failed to enable hover\n");
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}
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mutex_unlock(&sdata->mutex);
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if (sdata->use_key) {
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err = i2c_smbus_write_byte(sdata->client,
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STMFTS_MS_KEY_SENSE_ON);
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if (err)
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/* I can still use only the touch screen */
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dev_warn(&sdata->client->dev,
|
||||
"failed to enable touchkey\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void stmfts_input_close(struct input_dev *dev)
|
||||
{
|
||||
struct stmfts_data *sdata = input_get_drvdata(dev);
|
||||
int err;
|
||||
|
||||
err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
|
||||
if (err)
|
||||
dev_warn(&sdata->client->dev,
|
||||
"failed to disable touchscreen: %d\n", err);
|
||||
|
||||
mutex_lock(&sdata->mutex);
|
||||
|
||||
sdata->running = false;
|
||||
|
||||
if (sdata->hover_enabled) {
|
||||
err = i2c_smbus_write_byte(sdata->client,
|
||||
STMFTS_SS_HOVER_SENSE_OFF);
|
||||
if (err)
|
||||
dev_warn(&sdata->client->dev,
|
||||
"failed to disable hover: %d\n", err);
|
||||
}
|
||||
mutex_unlock(&sdata->mutex);
|
||||
|
||||
if (sdata->use_key) {
|
||||
err = i2c_smbus_write_byte(sdata->client,
|
||||
STMFTS_MS_KEY_SENSE_OFF);
|
||||
if (err)
|
||||
dev_warn(&sdata->client->dev,
|
||||
"failed to disable touchkey: %d\n", err);
|
||||
}
|
||||
|
||||
pm_runtime_put_sync(&sdata->client->dev);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_chip_id(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%#x\n", sdata->chip_id);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_chip_version(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%u\n", sdata->chip_ver);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%u\n", sdata->fw_ver);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_config_id(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%#x\n", sdata->config_id);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_config_version(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%u\n", sdata->config_ver);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_read_status(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
u8 status[4];
|
||||
int err;
|
||||
|
||||
err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
|
||||
sizeof(status), status);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return sprintf(buf, "%#02x\n", status[0]);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return sprintf(buf, "%u\n", sdata->hover_enabled);
|
||||
}
|
||||
|
||||
static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t len)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
unsigned long value;
|
||||
int err = 0;
|
||||
|
||||
if (kstrtoul(buf, 0, &value))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&sdata->mutex);
|
||||
|
||||
if (value & sdata->hover_enabled)
|
||||
goto out;
|
||||
|
||||
if (sdata->running)
|
||||
err = i2c_smbus_write_byte(sdata->client,
|
||||
value ? STMFTS_SS_HOVER_SENSE_ON :
|
||||
STMFTS_SS_HOVER_SENSE_OFF);
|
||||
|
||||
if (!err)
|
||||
sdata->hover_enabled = !!value;
|
||||
|
||||
out:
|
||||
mutex_unlock(&sdata->mutex);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
|
||||
static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
|
||||
static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
|
||||
static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
|
||||
static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
|
||||
static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
|
||||
static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
|
||||
stmfts_sysfs_hover_enable_write);
|
||||
|
||||
static struct attribute *stmfts_sysfs_attrs[] = {
|
||||
&dev_attr_chip_id.attr,
|
||||
&dev_attr_chip_version.attr,
|
||||
&dev_attr_fw_ver.attr,
|
||||
&dev_attr_config_id.attr,
|
||||
&dev_attr_config_version.attr,
|
||||
&dev_attr_status.attr,
|
||||
&dev_attr_hover_enable.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct attribute_group stmfts_attribute_group = {
|
||||
.attrs = stmfts_sysfs_attrs
|
||||
};
|
||||
|
||||
static int stmfts_power_on(struct stmfts_data *sdata)
|
||||
{
|
||||
int err;
|
||||
u8 reg[8];
|
||||
|
||||
err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
|
||||
sdata->regulators);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/*
|
||||
* The datasheet does not specify the power on time, but considering
|
||||
* that the reset time is < 10ms, I sleep 20ms to be sure
|
||||
*/
|
||||
msleep(20);
|
||||
|
||||
err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
|
||||
sizeof(reg), reg);
|
||||
if (err < 0)
|
||||
return err;
|
||||
if (err != sizeof(reg))
|
||||
return -EIO;
|
||||
|
||||
sdata->chip_id = be16_to_cpup((__be16 *)®[6]);
|
||||
sdata->chip_ver = reg[0];
|
||||
sdata->fw_ver = be16_to_cpup((__be16 *)®[2]);
|
||||
sdata->config_id = reg[4];
|
||||
sdata->config_ver = reg[5];
|
||||
|
||||
enable_irq(sdata->client->irq);
|
||||
|
||||
msleep(50);
|
||||
|
||||
err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* optional tuning */
|
||||
err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
|
||||
if (err)
|
||||
dev_warn(&sdata->client->dev,
|
||||
"failed to perform mutual auto tune: %d\n", err);
|
||||
|
||||
/* optional tuning */
|
||||
err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
|
||||
if (err)
|
||||
dev_warn(&sdata->client->dev,
|
||||
"failed to perform self auto tune: %d\n", err);
|
||||
|
||||
err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/*
|
||||
* At this point no one is using the touchscreen
|
||||
* and I don't really care about the return value
|
||||
*/
|
||||
(void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void stmfts_power_off(void *data)
|
||||
{
|
||||
struct stmfts_data *sdata = data;
|
||||
|
||||
disable_irq(sdata->client->irq);
|
||||
regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
|
||||
sdata->regulators);
|
||||
}
|
||||
|
||||
/* This function is void because I don't want to prevent using the touch key
|
||||
* only because the LEDs don't get registered
|
||||
*/
|
||||
static int stmfts_enable_led(struct stmfts_data *sdata)
|
||||
{
|
||||
int err;
|
||||
|
||||
/* get the regulator for powering the leds on */
|
||||
sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
|
||||
if (IS_ERR(sdata->ledvdd))
|
||||
return PTR_ERR(sdata->ledvdd);
|
||||
|
||||
sdata->led_cdev.name = STMFTS_DEV_NAME;
|
||||
sdata->led_cdev.max_brightness = LED_ON;
|
||||
sdata->led_cdev.brightness = LED_OFF;
|
||||
sdata->led_cdev.brightness_set = stmfts_brightness_set;
|
||||
sdata->led_cdev.brightness_get = stmfts_brightness_get;
|
||||
|
||||
err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
|
||||
if (err) {
|
||||
devm_regulator_put(sdata->ledvdd);
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int stmfts_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
int err;
|
||||
struct stmfts_data *sdata;
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
|
||||
I2C_FUNC_SMBUS_BYTE_DATA |
|
||||
I2C_FUNC_SMBUS_I2C_BLOCK))
|
||||
return -ENODEV;
|
||||
|
||||
sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
|
||||
if (!sdata)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, sdata);
|
||||
|
||||
sdata->client = client;
|
||||
mutex_init(&sdata->mutex);
|
||||
init_completion(&sdata->cmd_done);
|
||||
|
||||
sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
|
||||
sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
|
||||
err = devm_regulator_bulk_get(&client->dev,
|
||||
ARRAY_SIZE(sdata->regulators),
|
||||
sdata->regulators);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
sdata->input = devm_input_allocate_device(&client->dev);
|
||||
if (!sdata->input)
|
||||
return -ENOMEM;
|
||||
|
||||
sdata->input->name = STMFTS_DEV_NAME;
|
||||
sdata->input->id.bustype = BUS_I2C;
|
||||
sdata->input->open = stmfts_input_open;
|
||||
sdata->input->close = stmfts_input_close;
|
||||
|
||||
touchscreen_parse_properties(sdata->input, true, &sdata->prop);
|
||||
|
||||
input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0,
|
||||
sdata->prop.max_x, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0,
|
||||
sdata->prop.max_y, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
|
||||
input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
|
||||
|
||||
sdata->use_key = device_property_read_bool(&client->dev,
|
||||
"touch-key-connected");
|
||||
if (sdata->use_key) {
|
||||
input_set_capability(sdata->input, EV_KEY, KEY_MENU);
|
||||
input_set_capability(sdata->input, EV_KEY, KEY_BACK);
|
||||
}
|
||||
|
||||
err = input_mt_init_slots(sdata->input,
|
||||
STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
input_set_drvdata(sdata->input, sdata);
|
||||
|
||||
err = devm_request_threaded_irq(&client->dev, client->irq,
|
||||
NULL, stmfts_irq_handler,
|
||||
IRQF_ONESHOT,
|
||||
"stmfts_irq", sdata);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* stmfts_power_on expects interrupt to be disabled */
|
||||
disable_irq(client->irq);
|
||||
|
||||
dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
|
||||
|
||||
err = stmfts_power_on(sdata);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = input_register_device(sdata->input);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (sdata->use_key) {
|
||||
err = stmfts_enable_led(sdata);
|
||||
if (err) {
|
||||
/*
|
||||
* Even if the LEDs have failed to be initialized and
|
||||
* used in the driver, I can still use the device even
|
||||
* without LEDs. The ledvdd regulator pointer will be
|
||||
* used as a flag.
|
||||
*/
|
||||
dev_warn(&client->dev, "unable to use touchkey leds\n");
|
||||
sdata->ledvdd = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
err = sysfs_create_group(&sdata->client->dev.kobj,
|
||||
&stmfts_attribute_group);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
pm_runtime_enable(&client->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int stmfts_remove(struct i2c_client *client)
|
||||
{
|
||||
pm_runtime_disable(&client->dev);
|
||||
sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int stmfts_runtime_suspend(struct device *dev)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
int ret;
|
||||
|
||||
ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
|
||||
if (ret)
|
||||
dev_warn(dev, "failed to suspend device: %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int stmfts_runtime_resume(struct device *dev)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
int ret;
|
||||
|
||||
ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
|
||||
if (ret)
|
||||
dev_err(dev, "failed to resume device: %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __maybe_unused stmfts_suspend(struct device *dev)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
stmfts_power_off(sdata);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused stmfts_resume(struct device *dev)
|
||||
{
|
||||
struct stmfts_data *sdata = dev_get_drvdata(dev);
|
||||
|
||||
return stmfts_power_on(sdata);
|
||||
}
|
||||
|
||||
static const struct dev_pm_ops stmfts_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
|
||||
SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
|
||||
};
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id stmfts_of_match[] = {
|
||||
{ .compatible = "st,stmfts", },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, stmfts_of_match);
|
||||
#endif
|
||||
|
||||
static const struct i2c_device_id stmfts_id[] = {
|
||||
{ "stmfts", 0 },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, stmfts_id);
|
||||
|
||||
static struct i2c_driver stmfts_driver = {
|
||||
.driver = {
|
||||
.name = STMFTS_DEV_NAME,
|
||||
.of_match_table = of_match_ptr(stmfts_of_match),
|
||||
.pm = &stmfts_pm_ops,
|
||||
},
|
||||
.probe = stmfts_probe,
|
||||
.remove = stmfts_remove,
|
||||
.id_table = stmfts_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(stmfts_driver);
|
||||
|
||||
MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue