Re: [PATCH v2 1/5] input: touchscreen: add imx6ul_tsc driver support

[Markus Pargmann]

On Tue, Jul 28, 2015 at 05:58:37PM +0800, Haibo Chen wrote:
> Freescale i.MX6UL contains a internal touchscreen controller,
> this patch add a driver to support this controller.
> 
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxxxxxxxx>
> ---
>  drivers/input/touchscreen/Kconfig      |  12 +
>  drivers/input/touchscreen/Makefile     |   1 +
>  drivers/input/touchscreen/imx6ul_tsc.c | 504 +++++++++++++++++++++++++++++++++
>  3 files changed, 517 insertions(+)
>  create mode 100644 drivers/input/touchscreen/imx6ul_tsc.c
> 
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 5b272ba..32c300d 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -479,6 +479,18 @@ config TOUCHSCREEN_MTOUCH
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called mtouch.
>  
> +config TOUCHSCREEN_IMX6UL_TSC
> +	tristate "Freescale i.MX6UL touchscreen controller"
> +	depends on OF
> +	help
> +	  Say Y here if you have a Freescale i.MX6UL, and want to
> +	  use the internal touchscreen controller.
> +
> +	  If unsure, say N.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  moduel will be called imx6ul_tsc.
> +
>  config TOUCHSCREEN_INEXIO
>  	tristate "iNexio serial touchscreens"
>  	select SERIO
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index c85aae2..9379b32 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
>  obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o
>  obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix.o
>  obj-$(CONFIG_TOUCHSCREEN_ILI210X)	+= ili210x.o
> +obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)	+= imx6ul_tsc.o
>  obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o
>  obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)	+= intel-mid-touch.o
>  obj-$(CONFIG_TOUCHSCREEN_IPROC)		+= bcm_iproc_tsc.o
> diff --git a/drivers/input/touchscreen/imx6ul_tsc.c b/drivers/input/touchscreen/imx6ul_tsc.c
> new file mode 100644
> index 0000000..807f1db
> --- /dev/null
> +++ b/drivers/input/touchscreen/imx6ul_tsc.c
> @@ -0,0 +1,504 @@
> +/*
> + * Freescale i.MX6UL touchscreen controller driver
> + *
> + * Copyright (C) 2015 Freescale Semiconductor, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/gpio.h>
> +#include <linux/input.h>
> +#include <linux/slab.h>
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +
> +/* ADC configuration registers field define */
> +#define ADC_AIEN		(0x1 << 7)
> +#define ADC_CONV_DISABLE	0x1F
> +#define ADC_CAL			(0x1 << 7)
> +#define ADC_CALF		0x2
> +#define ADC_12BIT_MODE		(0x2 << 2)
> +#define ADC_IPG_CLK		0x00
> +#define ADC_CLK_DIV_8		(0x03 << 5)
> +#define ADC_SHORT_SAMPLE_MODE	(0x0 << 4)
> +#define ADC_HARDWARE_TRIGGER	(0x1 << 13)
> +#define SELECT_CHANNEL_4	0x04
> +#define SELECT_CHANNEL_1	0x01
> +#define DISABLE_CONVERSION_INT	(0x0 << 7)
> +
> +/* ADC registers */
> +#define REG_ADC_HC0		0x00
> +#define REG_ADC_HC1		0x04
> +#define REG_ADC_HC2		0x08
> +#define REG_ADC_HC3		0x0C
> +#define REG_ADC_HC4		0x10
> +#define REG_ADC_HS		0x14
> +#define REG_ADC_R0		0x18
> +#define REG_ADC_CFG		0x2C
> +#define REG_ADC_GC		0x30
> +#define REG_ADC_GS		0x34
> +
> +#define ADC_TIMEOUT		msecs_to_jiffies(100)

These defines are in two drivers. Here and in
drivers/iio/adc/vf610_adc.c

> +
> +/* TSC registers */
> +#define REG_TSC_BASIC_SETING	0x00
> +#define REG_TSC_PRE_CHARGE_TIME	0x10
> +#define REG_TSC_FLOW_CONTROL	0x20
> +#define REG_TSC_MEASURE_VALUE	0x30
> +#define REG_TSC_INT_EN		0x40
> +#define REG_TSC_INT_SIG_EN	0x50
> +#define REG_TSC_INT_STATUS	0x60
> +#define REG_TSC_DEBUG_MODE	0x70
> +#define REG_TSC_DEBUG_MODE2	0x80
> +
> +/* TSC configuration registers field define */
> +#define DETECT_4_WIRE_MODE	(0x0 << 4)
> +#define AUTO_MEASURE		0x1
> +#define MEASURE_SIGNAL		0x1
> +#define DETECT_SIGNAL		(0x1 << 4)
> +#define VALID_SIGNAL		(0x1 << 8)
> +#define MEASURE_INT_EN		0x1
> +#define MEASURE_SIG_EN		0x1
> +#define VALID_SIG_EN		(0x1 << 8)
> +#define DE_GLITCH_2		(0x2 << 29)
> +#define START_SENSE		(0x1 << 12)
> +#define TSC_DISABLE		(0x1 << 16)
> +#define DETECT_MODE		0x2
> +
> +struct imx6ul_tsc {
> +	struct device *dev;
> +	struct input_dev *input;
> +	void __iomem *tsc_regs;
> +	void __iomem *adc_regs;
> +	struct clk *tsc_clk;
> +	struct clk *adc_clk;
> +
> +	int xnur_gpio;
> +	int measure_delay_time;
> +	int pre_charge_time;
> +
> +	struct completion completion;
> +};
> +
> +/*
> + * TSC module need ADC to get the measure value. So
> + * before config TSC, we should initialize ADC module.
> + */
> +static void imx6ul_adc_init(struct imx6ul_tsc *tsc)
> +{
> +	int adc_hc = 0;
> +	int adc_gc;
> +	int adc_gs;
> +	int adc_cfg;
> +	int timeout;
> +
> +	adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
> +	adc_cfg |= ADC_12BIT_MODE | ADC_IPG_CLK;
> +	adc_cfg |= ADC_CLK_DIV_8 | ADC_SHORT_SAMPLE_MODE;
> +	adc_cfg &= ~ADC_HARDWARE_TRIGGER;
> +	writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
> +
> +	/* enable calibration interrupt */
> +	adc_hc |= ADC_AIEN;
> +	adc_hc |= ADC_CONV_DISABLE;
> +	writel(adc_hc, tsc->adc_regs + REG_ADC_HC0);
> +
> +	/* start ADC calibration */
> +	adc_gc = readl(tsc->adc_regs + REG_ADC_GC);
> +	adc_gc |= ADC_CAL;
> +	writel(adc_gc, tsc->adc_regs + REG_ADC_GC);
> +
> +	timeout = wait_for_completion_timeout
> +			(&tsc->completion, ADC_TIMEOUT);
> +	if (timeout == 0)
> +		dev_err(tsc->dev, "Timeout for adc calibration\n");
> +
> +	adc_gs = readl(tsc->adc_regs + REG_ADC_GS);
> +	if (adc_gs & ADC_CALF)
> +		dev_err(tsc->dev, "ADC calibration failed\n");
> +
> +	/* TSC need the ADC work in hardware trigger */
> +	adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
> +	adc_cfg |= ADC_HARDWARE_TRIGGER;
> +	writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
> +}
> +
> +/*
> + * This is a TSC workaround. Currently TSC misconnect two
> + * ADC channels, this function remap channel configure for
> + * hardware trigger.
> + */
> +static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc)
> +{
> +	int adc_hc0, adc_hc1, adc_hc2, adc_hc3, adc_hc4;
> +
> +	adc_hc0 = DISABLE_CONVERSION_INT;
> +	writel(adc_hc0, tsc->adc_regs + REG_ADC_HC0);
> +
> +	adc_hc1 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_4;
> +	writel(adc_hc1, tsc->adc_regs + REG_ADC_HC1);
> +
> +	adc_hc2 = DISABLE_CONVERSION_INT;
> +	writel(adc_hc2, tsc->adc_regs + REG_ADC_HC2);
> +
> +	adc_hc3 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_1;
> +	writel(adc_hc3, tsc->adc_regs + REG_ADC_HC3);
> +
> +	adc_hc4 = DISABLE_CONVERSION_INT;
> +	writel(adc_hc4, tsc->adc_regs + REG_ADC_HC4);
> +}

Is this code similar to initialization of the adc driver? Does it make
sense to move this code to the ADC driver?

Best regards,

Markus

> +
> +/*
> + * TSC setting, confige the pre-charge time and measure delay time.
> + * different touch screen may need different pre-charge time and
> + * measure delay time.
> + */
> +static void imx6ul_tsc_set(struct imx6ul_tsc *tsc)
> +{
> +	int basic_setting = 0;
> +	int start;
> +
> +	basic_setting |= tsc->measure_delay_time << 8;
> +	basic_setting |= DETECT_4_WIRE_MODE | AUTO_MEASURE;
> +	writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETING);
> +
> +	writel(DE_GLITCH_2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
> +
> +	writel(tsc->pre_charge_time, tsc->tsc_regs + REG_TSC_PRE_CHARGE_TIME);
> +	writel(MEASURE_INT_EN, tsc->tsc_regs + REG_TSC_INT_EN);
> +	writel(MEASURE_SIG_EN | VALID_SIG_EN,
> +		tsc->tsc_regs + REG_TSC_INT_SIG_EN);
> +
> +	/* start sense detection */
> +	start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +	start |= START_SENSE;
> +	start &= ~TSC_DISABLE;
> +	writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +}
> +
> +static void imx6ul_tsc_init(struct imx6ul_tsc *tsc)
> +{
> +	imx6ul_adc_init(tsc);
> +	imx6ul_tsc_channel_config(tsc);
> +	imx6ul_tsc_set(tsc);
> +}
> +
> +static irqreturn_t tsc_irq_fn(int irq, void *dev_id)
> +{
> +	struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id;
> +	int status;
> +	int value;
> +	int x, y;
> +	int xnur;
> +	int debug_mode2;
> +	int state_machine;
> +	int start;
> +	unsigned long timeout;
> +
> +	status = readl(tsc->tsc_regs + REG_TSC_INT_STATUS);
> +
> +	/* write 1 to clear the bit measure-signal */
> +	writel(MEASURE_SIGNAL | DETECT_SIGNAL,
> +		tsc->tsc_regs + REG_TSC_INT_STATUS);
> +
> +	/* It's a HW self-clean bit. Set this bit and start sense detection */
> +	start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +	start |= START_SENSE;
> +	writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +
> +	if (status & MEASURE_SIGNAL) {
> +		value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE);
> +		x = (value >> 16) & 0x0fff;
> +		y = value & 0x0fff;
> +
> +		/*
> +		 * Delay some time(max 2ms), wait the pre-charge done.
> +		 * After the pre-change mode, TSC go into detect mode.
> +		 * And in detect mode, we can get the xnur gpio value.
> +		 * If xnur is low, this means the touch screen still
> +		 * be touched. If xnur is high, this means finger leave
> +		 * the touch screen.
> +		 */
> +		timeout = jiffies + HZ/500;
> +		do {
> +			if (time_after(jiffies, timeout)) {
> +				xnur = 0;
> +				goto touch_event;
> +			}
> +			usleep_range(200, 400);
> +			debug_mode2 = readl(tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
> +			state_machine = (debug_mode2 >> 20) & 0x7;
> +		} while (state_machine != DETECT_MODE);
> +		usleep_range(200, 400);
> +
> +		xnur = gpio_get_value(tsc->xnur_gpio);
> +touch_event:
> +		if (xnur == 0) {
> +			input_report_key(tsc->input, BTN_TOUCH, 1);
> +			input_report_abs(tsc->input, ABS_X, x);
> +			input_report_abs(tsc->input, ABS_Y, y);
> +		} else
> +			input_report_key(tsc->input, BTN_TOUCH, 0);
> +
> +		input_sync(tsc->input);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t adc_irq_fn(int irq, void *dev_id)
> +{
> +	struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id;
> +	int coco;
> +	int value;
> +
> +	coco = readl(tsc->adc_regs + REG_ADC_HS);
> +	if (coco & 0x01) {
> +		value = readl(tsc->adc_regs + REG_ADC_R0);
> +		complete(&tsc->completion);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static const struct of_device_id imx6ul_tsc_match[] = {
> +	{ .compatible = "fsl,imx6ul-tsc", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx6ul_tsc_match);
> +
> +static int imx6ul_tsc_probe(struct platform_device *pdev)
> +{
> +	struct imx6ul_tsc *tsc;
> +	struct resource *tsc_mem;
> +	struct resource *adc_mem;
> +	struct input_dev *input_dev;
> +	struct device_node *np = pdev->dev.of_node;
> +	int err;
> +	int tsc_irq;
> +	int adc_irq;
> +
> +	tsc = devm_kzalloc(&pdev->dev, sizeof(struct imx6ul_tsc), GFP_KERNEL);
> +	input_dev = devm_input_allocate_device(&pdev->dev);
> +
> +	tsc->dev = &pdev->dev;
> +
> +	tsc->input = input_dev;
> +	tsc->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
> +	tsc->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
> +	input_set_abs_params(tsc->input, ABS_X, 0, 0xFFF, 0, 0);
> +	input_set_abs_params(tsc->input, ABS_Y, 0, 0xFFF, 0, 0);
> +
> +	tsc->input->name = "iMX6UL TouchScreen Controller";
> +
> +	tsc->xnur_gpio = of_get_named_gpio(np, "xnur-gpio", 0);
> +	err = gpio_request_one(tsc->xnur_gpio, GPIOF_IN, "tsc_X-");
> +	if (err) {
> +		dev_err(&pdev->dev, "failed to request GPIO tsc_X-\n");
> +		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)) {
> +		dev_err(&pdev->dev, "failed to remap tsc memory\n");
> +		err = PTR_ERR(tsc->tsc_regs);
> +		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)) {
> +		dev_err(&pdev->dev, "failed to remap adc memory\n");
> +		err = PTR_ERR(tsc->adc_regs);
> +		return err;
> +	}
> +
> +	tsc->tsc_clk = devm_clk_get(&pdev->dev, "tsc");
> +	if (IS_ERR(tsc->tsc_clk)) {
> +		dev_err(&pdev->dev, "failed getting tsc clock\n");
> +		err = PTR_ERR(tsc->tsc_clk);
> +		return err;
> +	}
> +
> +	tsc->adc_clk = devm_clk_get(&pdev->dev, "adc");
> +	if (IS_ERR(tsc->adc_clk)) {
> +		dev_err(&pdev->dev, "failed getting adc clock\n");
> +		err = PTR_ERR(tsc->adc_clk);
> +		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_TRIGGER_HIGH | IRQF_ONESHOT,
> +					dev_name(&pdev->dev), tsc);
> +	if (err < 0) {
> +		dev_err(&pdev->dev,
> +			"failed requesting tsc irq %d\n",
> +					    tsc_irq);
> +		return err;
> +	}
> +
> +	err = devm_request_irq(tsc->dev, adc_irq,
> +				adc_irq_fn, 0,
> +				dev_name(&pdev->dev), tsc);
> +	if (err < 0) {
> +		dev_err(&pdev->dev,
> +			"failed requesting adc irq %d\n",
> +					    adc_irq);
> +		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;
> +
> +	init_completion(&tsc->completion);
> +
> +	err = clk_prepare_enable(tsc->adc_clk);
> +	if (err) {
> +		dev_err(&pdev->dev,
> +			"Could not prepare or enable the adc clock.\n");
> +		return err;
> +	}
> +
> +	err = clk_prepare_enable(tsc->tsc_clk);
> +	if (err) {
> +		dev_err(&pdev->dev,
> +			"Could not prepare or enable the tsc clock.\n");
> +		goto error_tsc_clk_enable;
> +	}
> +
> +	err = input_register_device(tsc->input);
> +	if (err < 0) {
> +		dev_err(&pdev->dev, "failed to register input device\n");
> +		err = -EIO;
> +		goto err_input_register;
> +	}
> +
> +	imx6ul_tsc_init(tsc);
> +
> +	platform_set_drvdata(pdev, tsc);
> +	return 0;
> +
> +err_input_register:
> +	clk_disable_unprepare(tsc->tsc_clk);
> +error_tsc_clk_enable:
> +	clk_disable_unprepare(tsc->adc_clk);
> +
> +	return err;
> +}
> +
> +static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc)
> +{
> +	int tsc_flow;
> +	int adc_cfg;
> +
> +	/* TSC controller enters to idle status */
> +	tsc_flow = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +	tsc_flow |= TSC_DISABLE;
> +	writel(tsc_flow, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
> +
> +	/* ADC controller enters to stop mode */
> +	adc_cfg = readl(tsc->adc_regs + REG_ADC_HC0);
> +	adc_cfg |= ADC_CONV_DISABLE;
> +	writel(adc_cfg, tsc->adc_regs + REG_ADC_HC0);
> +}
> +
> +static int imx6ul_tsc_remove(struct platform_device *pdev)
> +{
> +	struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
> +
> +	imx6ul_tsc_disable(tsc);
> +
> +	clk_disable_unprepare(tsc->tsc_clk);
> +	clk_disable_unprepare(tsc->adc_clk);
> +	input_unregister_device(tsc->input);
> +	kfree(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);
> +
> +	imx6ul_tsc_disable(tsc);
> +
> +	clk_disable_unprepare(tsc->tsc_clk);
> +	clk_disable_unprepare(tsc->adc_clk);
> +
> +	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);
> +	int err;
> +
> +	err = clk_prepare_enable(tsc->adc_clk);
> +	if (err)
> +		return err;
> +
> +	err = clk_prepare_enable(tsc->tsc_clk);
> +	if (err) {
> +		clk_disable_unprepare(tsc->adc_clk);
> +		return err;
> +	}
> +
> +	imx6ul_tsc_init(tsc);
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops,
> +			 imx6ul_tsc_suspend,
> +			 imx6ul_tsc_resume);
> +
> +static struct platform_driver imx6ul_tsc_driver = {
> +	.driver		= {
> +		.name	= "imx6ul-tsc",
> +		.owner	= THIS_MODULE,
> +		.of_match_table	= imx6ul_tsc_match,
> +		.pm	= &imx6ul_tsc_pm_ops,
> +	},
> +	.probe		= imx6ul_tsc_probe,
> +	.remove		= imx6ul_tsc_remove,
> +};
> +module_platform_driver(imx6ul_tsc_driver);
> +
> +MODULE_AUTHOR("Haibo Chen <haibo.chen@xxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 1.9.1
> 
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