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

From: Chen Bough
Date: Mon Aug 24 2015 - 04:24:26 EST

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Hi Markus,

> -----Original Message-----
> From: Markus Pargmann [mailto:mpa@xxxxxxxxxxxxxx]
> Sent: Friday, August 21, 2015 5:26 PM
> To: Chen Haibo-B51421
> Cc: robh+dt@xxxxxxxxxx; pawel.moll@xxxxxxx; mark.rutland@xxxxxxx;
> ijc+devicetree@xxxxxxxxxxxxxx; galak@xxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; linux@xxxxxxxxxxxxxxxx; dmitry.torokhov@xxxxxxxxx;
> hans.verkuil@xxxxxxxxx; hadess@xxxxxxxxxx; mchehab@xxxxxxxxxxxxxxx;
> mamlinav@xxxxxxxxx; arnd@xxxxxxxx; jonathar@xxxxxxxxxxxx;
> hdegoede@xxxxxxxxxx; christian.gmeiner@xxxxxxxxx; scott.liu@xxxxxxxxxx;
> geert@xxxxxxxxxxxxxx; benjamin.tissoires@xxxxxxxxxx;
> sebastien.szymanski@xxxxxxxxxxxx; sbranden@xxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; linux-input@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH v2 1/5] input: touchscreen: add imx6ul_tsc driver
> support
>
> 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

Actually, they are different. In the TSC driver, add REG_ADC_HC2/3/4, and the offset of the
REG_ADC_HS~ REG_ADC_GS also changed.

For i.MX6UL, to support TSC, our IC team add some changes in ADC2, like add add REG_ADC_HC2/3/4,
so that we can config the channel of ADC2 to connect with X-/X+/Y+/Y- of touch screen.
And IC team suggest the ADC2 only used for TSC, should not work as a normal ADC.

>
> > +
> > +/* 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?

Our IC team misconnect the ADC's channel1 and channel3, in the TSC logic,
ADC channel1 ---> Y-
ADC channel2 ---> Y+
ADC channel3 ---> X-
ADC channel4 ---> X+
The upper connection can make tsc work normal, but our IC team make a mistake,
in default, ADC channel1 connect to X-, ADC channel3 connect to Y-.

So these code is just a software workaround, switch the ADC channel1 and channel3,
to make the TSC work normal.

So I think we should distinguish these code and the adc initialization.

Best regards,

haibo

>
> 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
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe
> > linux-kernel" in the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
> >
>
> --
> Pengutronix e.K. |
> |
> Industrial Linux Solutions | http://www.pengutronix.de/
> |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0
> |
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