Input: touchscreen - add imx6ul_tsc driver support
Freescale i.MX6UL contains a internal touchscreen controller, this patch add a driver to support this controller. Signed-off-by: Haibo Chen <haibo.chen@freescale.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Haibo Chen
Dmitry Torokhov
parent
48ead50c1d
commit
9a436d524d
@ -0,0 +1,36 @@
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* Freescale i.MX6UL Touch Controller
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Required properties:
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- compatible: must be "fsl,imx6ul-tsc".
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- reg: this touch controller address and the ADC2 address.
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- interrupts: the interrupt of this touch controller and ADC2.
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- clocks: the root clock of touch controller and ADC2.
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- clock-names; must be "tsc" and "adc".
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- xnur-gpio: the X- gpio this controller connect to.
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This xnur-gpio returns to low once the finger leave the touch screen (The
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last touch event the touch controller capture).
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Optional properties:
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- measure-delay-time: the value of measure delay time.
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Before X-axis or Y-axis measurement, the screen need some time before
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even potential distribution ready.
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This value depends on the touch screen.
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- pre-charge-time: the touch screen need some time to precharge.
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This value depends on the touch screen.
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Example:
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tsc: tsc@02040000 {
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compatible = "fsl,imx6ul-tsc";
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reg = <0x02040000 0x4000>, <0x0219c000 0x4000>;
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interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
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<GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&clks IMX6UL_CLK_IPG>,
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<&clks IMX6UL_CLK_ADC2>;
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clock-names = "tsc", "adc";
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_tsc>;
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xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>;
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measure-delay-time = <0xfff>;
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pre-charge-time = <0xffff>;
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status = "okay";
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};
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@ -479,6 +479,18 @@ config TOUCHSCREEN_MTOUCH
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To compile this driver as a module, choose M here: the
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module will be called mtouch.
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config TOUCHSCREEN_IMX6UL_TSC
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tristate "Freescale i.MX6UL touchscreen controller"
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depends on (OF && GPIOLIB) || COMPILE_TEST
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help
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Say Y here if you have a Freescale i.MX6UL, and want to
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use the internal touchscreen controller.
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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 imx6ul_tsc.
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config TOUCHSCREEN_INEXIO
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tristate "iNexio serial touchscreens"
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select SERIO
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@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
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obj-$(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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obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC) += imx6ul_tsc.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
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obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
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obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
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523
drivers/input/touchscreen/imx6ul_tsc.c
Normal file
523
drivers/input/touchscreen/imx6ul_tsc.c
Normal file
@ -0,0 +1,523 @@
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/*
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* Freescale i.MX6UL touchscreen controller driver
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*
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* Copyright (C) 2015 Freescale Semiconductor, 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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio/consumer.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/of.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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/* ADC configuration registers field define */
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#define ADC_AIEN (0x1 << 7)
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#define ADC_CONV_DISABLE 0x1F
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#define ADC_CAL (0x1 << 7)
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#define ADC_CALF 0x2
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#define ADC_12BIT_MODE (0x2 << 2)
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#define ADC_IPG_CLK 0x00
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#define ADC_CLK_DIV_8 (0x03 << 5)
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#define ADC_SHORT_SAMPLE_MODE (0x0 << 4)
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#define ADC_HARDWARE_TRIGGER (0x1 << 13)
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#define SELECT_CHANNEL_4 0x04
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#define SELECT_CHANNEL_1 0x01
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#define DISABLE_CONVERSION_INT (0x0 << 7)
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/* ADC registers */
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#define REG_ADC_HC0 0x00
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#define REG_ADC_HC1 0x04
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#define REG_ADC_HC2 0x08
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#define REG_ADC_HC3 0x0C
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#define REG_ADC_HC4 0x10
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#define REG_ADC_HS 0x14
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#define REG_ADC_R0 0x18
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#define REG_ADC_CFG 0x2C
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#define REG_ADC_GC 0x30
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#define REG_ADC_GS 0x34
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#define ADC_TIMEOUT msecs_to_jiffies(100)
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/* TSC registers */
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#define REG_TSC_BASIC_SETING 0x00
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#define REG_TSC_PRE_CHARGE_TIME 0x10
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#define REG_TSC_FLOW_CONTROL 0x20
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#define REG_TSC_MEASURE_VALUE 0x30
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#define REG_TSC_INT_EN 0x40
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#define REG_TSC_INT_SIG_EN 0x50
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#define REG_TSC_INT_STATUS 0x60
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#define REG_TSC_DEBUG_MODE 0x70
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#define REG_TSC_DEBUG_MODE2 0x80
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/* TSC configuration registers field define */
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#define DETECT_4_WIRE_MODE (0x0 << 4)
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#define AUTO_MEASURE 0x1
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#define MEASURE_SIGNAL 0x1
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#define DETECT_SIGNAL (0x1 << 4)
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#define VALID_SIGNAL (0x1 << 8)
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#define MEASURE_INT_EN 0x1
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#define MEASURE_SIG_EN 0x1
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#define VALID_SIG_EN (0x1 << 8)
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#define DE_GLITCH_2 (0x2 << 29)
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#define START_SENSE (0x1 << 12)
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#define TSC_DISABLE (0x1 << 16)
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#define DETECT_MODE 0x2
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struct imx6ul_tsc {
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struct device *dev;
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struct input_dev *input;
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void __iomem *tsc_regs;
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void __iomem *adc_regs;
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struct clk *tsc_clk;
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struct clk *adc_clk;
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struct gpio_desc *xnur_gpio;
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int measure_delay_time;
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int pre_charge_time;
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struct completion completion;
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};
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/*
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* TSC module need ADC to get the measure value. So
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* before config TSC, we should initialize ADC module.
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*/
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static void imx6ul_adc_init(struct imx6ul_tsc *tsc)
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{
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int adc_hc = 0;
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int adc_gc;
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int adc_gs;
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int adc_cfg;
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int timeout;
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reinit_completion(&tsc->completion);
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adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
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adc_cfg |= ADC_12BIT_MODE | ADC_IPG_CLK;
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adc_cfg |= ADC_CLK_DIV_8 | ADC_SHORT_SAMPLE_MODE;
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adc_cfg &= ~ADC_HARDWARE_TRIGGER;
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writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
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/* enable calibration interrupt */
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adc_hc |= ADC_AIEN;
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adc_hc |= ADC_CONV_DISABLE;
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writel(adc_hc, tsc->adc_regs + REG_ADC_HC0);
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/* start ADC calibration */
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adc_gc = readl(tsc->adc_regs + REG_ADC_GC);
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adc_gc |= ADC_CAL;
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writel(adc_gc, tsc->adc_regs + REG_ADC_GC);
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timeout = wait_for_completion_timeout
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(&tsc->completion, ADC_TIMEOUT);
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if (timeout == 0)
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dev_err(tsc->dev, "Timeout for adc calibration\n");
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adc_gs = readl(tsc->adc_regs + REG_ADC_GS);
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if (adc_gs & ADC_CALF)
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dev_err(tsc->dev, "ADC calibration failed\n");
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/* TSC need the ADC work in hardware trigger */
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adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
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adc_cfg |= ADC_HARDWARE_TRIGGER;
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writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
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}
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/*
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* This is a TSC workaround. Currently TSC misconnect two
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* ADC channels, this function remap channel configure for
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* hardware trigger.
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*/
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static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc)
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{
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int adc_hc0, adc_hc1, adc_hc2, adc_hc3, adc_hc4;
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adc_hc0 = DISABLE_CONVERSION_INT;
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writel(adc_hc0, tsc->adc_regs + REG_ADC_HC0);
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adc_hc1 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_4;
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writel(adc_hc1, tsc->adc_regs + REG_ADC_HC1);
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adc_hc2 = DISABLE_CONVERSION_INT;
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writel(adc_hc2, tsc->adc_regs + REG_ADC_HC2);
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adc_hc3 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_1;
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writel(adc_hc3, tsc->adc_regs + REG_ADC_HC3);
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adc_hc4 = DISABLE_CONVERSION_INT;
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writel(adc_hc4, tsc->adc_regs + REG_ADC_HC4);
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}
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/*
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* TSC setting, confige the pre-charge time and measure delay time.
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* different touch screen may need different pre-charge time and
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* measure delay time.
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*/
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static void imx6ul_tsc_set(struct imx6ul_tsc *tsc)
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{
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int basic_setting = 0;
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int start;
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basic_setting |= tsc->measure_delay_time << 8;
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basic_setting |= DETECT_4_WIRE_MODE | AUTO_MEASURE;
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writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETING);
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writel(DE_GLITCH_2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
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writel(tsc->pre_charge_time, tsc->tsc_regs + REG_TSC_PRE_CHARGE_TIME);
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writel(MEASURE_INT_EN, tsc->tsc_regs + REG_TSC_INT_EN);
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writel(MEASURE_SIG_EN | VALID_SIG_EN,
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tsc->tsc_regs + REG_TSC_INT_SIG_EN);
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/* start sense detection */
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start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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start |= START_SENSE;
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start &= ~TSC_DISABLE;
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writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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}
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static void imx6ul_tsc_init(struct imx6ul_tsc *tsc)
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{
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imx6ul_adc_init(tsc);
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imx6ul_tsc_channel_config(tsc);
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imx6ul_tsc_set(tsc);
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}
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static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc)
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{
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int tsc_flow;
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int adc_cfg;
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/* TSC controller enters to idle status */
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tsc_flow = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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tsc_flow |= TSC_DISABLE;
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writel(tsc_flow, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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/* ADC controller enters to stop mode */
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adc_cfg = readl(tsc->adc_regs + REG_ADC_HC0);
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adc_cfg |= ADC_CONV_DISABLE;
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writel(adc_cfg, tsc->adc_regs + REG_ADC_HC0);
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}
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/* Delay some time (max 2ms), wait the pre-charge done. */
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static bool tsc_wait_detect_mode(struct imx6ul_tsc *tsc)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(2);
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int state_machine;
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int debug_mode2;
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do {
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if (time_after(jiffies, timeout))
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return false;
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usleep_range(200, 400);
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debug_mode2 = readl(tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
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state_machine = (debug_mode2 >> 20) & 0x7;
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} while (state_machine != DETECT_MODE);
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usleep_range(200, 400);
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return true;
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}
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static irqreturn_t tsc_irq_fn(int irq, void *dev_id)
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{
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struct imx6ul_tsc *tsc = dev_id;
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int status;
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int value;
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int x, y;
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int start;
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status = readl(tsc->tsc_regs + REG_TSC_INT_STATUS);
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/* write 1 to clear the bit measure-signal */
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writel(MEASURE_SIGNAL | DETECT_SIGNAL,
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tsc->tsc_regs + REG_TSC_INT_STATUS);
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/* It's a HW self-clean bit. Set this bit and start sense detection */
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start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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start |= START_SENSE;
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writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
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if (status & MEASURE_SIGNAL) {
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value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE);
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x = (value >> 16) & 0x0fff;
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y = value & 0x0fff;
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/*
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* In detect mode, we can get the xnur gpio value,
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* otherwise assume contact is stiull active.
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*/
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if (!tsc_wait_detect_mode(tsc) ||
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gpiod_get_value_cansleep(tsc->xnur_gpio)) {
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input_report_key(tsc->input, BTN_TOUCH, 1);
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input_report_abs(tsc->input, ABS_X, x);
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input_report_abs(tsc->input, ABS_Y, y);
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} else {
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input_report_key(tsc->input, BTN_TOUCH, 0);
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}
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input_sync(tsc->input);
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t adc_irq_fn(int irq, void *dev_id)
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{
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struct imx6ul_tsc *tsc = dev_id;
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int coco;
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int value;
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coco = readl(tsc->adc_regs + REG_ADC_HS);
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if (coco & 0x01) {
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value = readl(tsc->adc_regs + REG_ADC_R0);
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complete(&tsc->completion);
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}
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return IRQ_HANDLED;
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}
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static int imx6ul_tsc_open(struct input_dev *input_dev)
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{
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struct imx6ul_tsc *tsc = input_get_drvdata(input_dev);
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int err;
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err = clk_prepare_enable(tsc->adc_clk);
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if (err) {
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dev_err(tsc->dev,
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"Could not prepare or enable the adc clock: %d\n",
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err);
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return err;
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}
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err = clk_prepare_enable(tsc->tsc_clk);
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if (err) {
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dev_err(tsc->dev,
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"Could not prepare or enable the tsc clock: %d\n",
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err);
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clk_disable_unprepare(tsc->adc_clk);
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return err;
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}
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imx6ul_tsc_init(tsc);
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return 0;
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}
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static void imx6ul_tsc_close(struct input_dev *input_dev)
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{
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struct imx6ul_tsc *tsc = input_get_drvdata(input_dev);
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imx6ul_tsc_disable(tsc);
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clk_disable_unprepare(tsc->tsc_clk);
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clk_disable_unprepare(tsc->adc_clk);
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}
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static int imx6ul_tsc_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct imx6ul_tsc *tsc;
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struct input_dev *input_dev;
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struct resource *tsc_mem;
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struct resource *adc_mem;
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int err;
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int tsc_irq;
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int adc_irq;
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tsc = devm_kzalloc(&pdev->dev, sizeof(struct imx6ul_tsc), GFP_KERNEL);
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if (!tsc)
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return -ENOMEM;
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!input_dev)
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return -ENOMEM;
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input_dev->name = "iMX6UL TouchScreen Controller";
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input_dev->id.bustype = BUS_HOST;
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input_dev->open = imx6ul_tsc_open;
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input_dev->close = imx6ul_tsc_close;
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input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, 0, 0xFFF, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 0xFFF, 0, 0);
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input_set_drvdata(input_dev, tsc);
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tsc->dev = &pdev->dev;
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tsc->input = input_dev;
|
||||
init_completion(&tsc->completion);
|
||||
|
||||
tsc->xnur_gpio = devm_gpiod_get(&pdev->dev, "xnur", GPIOD_IN);
|
||||
if (IS_ERR(tsc->xnur_gpio)) {
|
||||
err = PTR_ERR(tsc->xnur_gpio);
|
||||
dev_err(&pdev->dev,
|
||||
"failed to request GPIO tsc_X- (xnur): %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
tsc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
tsc->tsc_regs = devm_ioremap_resource(&pdev->dev, tsc_mem);
|
||||
if (IS_ERR(tsc->tsc_regs)) {
|
||||
err = PTR_ERR(tsc->tsc_regs);
|
||||
dev_err(&pdev->dev, "failed to remap tsc memory: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
adc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
tsc->adc_regs = devm_ioremap_resource(&pdev->dev, adc_mem);
|
||||
if (IS_ERR(tsc->adc_regs)) {
|
||||
err = PTR_ERR(tsc->adc_regs);
|
||||
dev_err(&pdev->dev, "failed to remap adc memory: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
tsc->tsc_clk = devm_clk_get(&pdev->dev, "tsc");
|
||||
if (IS_ERR(tsc->tsc_clk)) {
|
||||
err = PTR_ERR(tsc->tsc_clk);
|
||||
dev_err(&pdev->dev, "failed getting tsc clock: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
tsc->adc_clk = devm_clk_get(&pdev->dev, "adc");
|
||||
if (IS_ERR(tsc->adc_clk)) {
|
||||
err = PTR_ERR(tsc->adc_clk);
|
||||
dev_err(&pdev->dev, "failed getting adc clock: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
tsc_irq = platform_get_irq(pdev, 0);
|
||||
if (tsc_irq < 0) {
|
||||
dev_err(&pdev->dev, "no tsc irq resource?\n");
|
||||
return tsc_irq;
|
||||
}
|
||||
|
||||
adc_irq = platform_get_irq(pdev, 1);
|
||||
if (adc_irq <= 0) {
|
||||
dev_err(&pdev->dev, "no adc irq resource?\n");
|
||||
return adc_irq;
|
||||
}
|
||||
|
||||
err = devm_request_threaded_irq(tsc->dev, tsc_irq,
|
||||
NULL, tsc_irq_fn, IRQF_ONESHOT,
|
||||
dev_name(&pdev->dev), tsc);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"failed requesting tsc irq %d: %d\n",
|
||||
tsc_irq, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = devm_request_irq(tsc->dev, adc_irq, adc_irq_fn, 0,
|
||||
dev_name(&pdev->dev), tsc);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"failed requesting adc irq %d: %d\n",
|
||||
adc_irq, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = of_property_read_u32(np, "measure-delay-time",
|
||||
&tsc->measure_delay_time);
|
||||
if (err)
|
||||
tsc->measure_delay_time = 0xffff;
|
||||
|
||||
err = of_property_read_u32(np, "pre-charge-time",
|
||||
&tsc->pre_charge_time);
|
||||
if (err)
|
||||
tsc->pre_charge_time = 0xfff;
|
||||
|
||||
err = input_register_device(tsc->input);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"failed to register input device: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, tsc);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused imx6ul_tsc_suspend(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
|
||||
struct input_dev *input_dev = tsc->input;
|
||||
|
||||
mutex_lock(&input_dev->mutex);
|
||||
|
||||
if (input_dev->users) {
|
||||
imx6ul_tsc_disable(tsc);
|
||||
|
||||
clk_disable_unprepare(tsc->tsc_clk);
|
||||
clk_disable_unprepare(tsc->adc_clk);
|
||||
}
|
||||
|
||||
mutex_unlock(&input_dev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused imx6ul_tsc_resume(struct device *dev)
|
||||
{
|
||||
struct platform_device *pdev = to_platform_device(dev);
|
||||
struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
|
||||
struct input_dev *input_dev = tsc->input;
|
||||
int retval = 0;
|
||||
|
||||
mutex_lock(&input_dev->mutex);
|
||||
|
||||
if (input_dev->users) {
|
||||
retval = clk_prepare_enable(tsc->adc_clk);
|
||||
if (retval)
|
||||
goto out;
|
||||
|
||||
retval = clk_prepare_enable(tsc->tsc_clk);
|
||||
if (retval) {
|
||||
clk_disable_unprepare(tsc->adc_clk);
|
||||
goto out;
|
||||
}
|
||||
|
||||
imx6ul_tsc_init(tsc);
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&input_dev->mutex);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops,
|
||||
imx6ul_tsc_suspend, imx6ul_tsc_resume);
|
||||
|
||||
static const struct of_device_id imx6ul_tsc_match[] = {
|
||||
{ .compatible = "fsl,imx6ul-tsc", },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, imx6ul_tsc_match);
|
||||
|
||||
static struct platform_driver imx6ul_tsc_driver = {
|
||||
.driver = {
|
||||
.name = "imx6ul-tsc",
|
||||
.of_match_table = imx6ul_tsc_match,
|
||||
.pm = &imx6ul_tsc_pm_ops,
|
||||
},
|
||||
.probe = imx6ul_tsc_probe,
|
||||
};
|
||||
module_platform_driver(imx6ul_tsc_driver);
|
||||
|
||||
MODULE_AUTHOR("Haibo Chen <haibo.chen@freescale.com>");
|
||||
MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user