| Message ID | 1437996407-27266-2-git-send-email-haibo.chen@freescale.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Haibo, On Mon, Jul 27, 2015 at 07:26:43PM +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@freescale.com> > --- > drivers/input/touchscreen/Kconfig | 12 + > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/imx6ul_tsc.c | 510 +++++++++++++++++++++++++++++++++ > 3 files changed, 523 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..5a5a368 > --- /dev/null > +++ b/drivers/input/touchscreen/imx6ul_tsc.c > @@ -0,0 +1,510 @@ > +/* > + * 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) > + > +/* 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 tsc_irq; > + int adc_irq; You do not need to store tsc_irq and adc_irq since you do not reference them anywhere but in probe(). > + int value; Why do we need this? > + 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); > +} > + > +/* > + * 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(int irq, void *dev_id) > +{ > + struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id; > + int status; > + 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) { > + tsc->value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE); > + x = (tsc->value >> 16) & 0x0fff; > + y = tsc->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(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; > + > + tsc = kzalloc(sizeof(struct imx6ul_tsc), GFP_KERNEL); Why not devm_kzalloc()? > + if (!tsc) { > + err = -ENOMEM; > + goto err_free_mem_tsc; > + } > + > + input_dev = input_allocate_device(); devm_input_allocate_device(&pdev->dev)? > + if (!input_dev) { > + err = -ENOMEM; > + goto err_free_mem; > + } > + > + 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"); > + goto err_free_mem; > + } > + > + 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); > + goto err_free_mem; > + } > + > + 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); > + goto err_free_mem; > + } > + > + 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); > + goto err_free_mem; > + } > + > + 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); > + goto err_free_mem; > + } > + > + tsc->tsc_irq = platform_get_irq(pdev, 0); > + if (tsc->tsc_irq <= 0) { > + dev_err(&pdev->dev, "no tsc irq resource?\n"); > + err = -EINVAL; > + goto err_free_mem; > + } > + > + tsc->adc_irq = platform_get_irq(pdev, 1); > + if (tsc->adc_irq <= 0) { > + dev_err(&pdev->dev, "no adc irq resource?\n"); > + err = -EINVAL; I think platform_get_irq() return negative errors, so let's check for tsc->adc_irq < 0 and do: return tsc->adc_irq? > + goto err_free_mem; > + } > + > + err = devm_request_threaded_irq(tsc->dev, tsc->tsc_irq, > + NULL, tsc_irq, > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, Do we need to hard-code the trigger? Maybe rely on board/OF code to set up the trigger flags properly? > + dev_name(&pdev->dev), tsc); > + if (err < 0) { > + dev_err(&pdev->dev, > + "failed requesting tsc irq %d\n", > + tsc->tsc_irq); > + goto err_free_mem; > + } > + > + err = devm_request_irq(tsc->dev, tsc->adc_irq, > + adc_irq, 0, > + dev_name(&pdev->dev), tsc); > + if (err < 0) { > + dev_err(&pdev->dev, > + "failed requesting adc irq %d\n", > + tsc->adc_irq); > + goto err_free_mem; > + } > + > + 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"); > + goto err_free_mem; > + } > + > + 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); > +err_free_mem: > + input_free_device(tsc->input); > +err_free_mem_tsc: > + kfree(tsc); > + return err; > +} > + > +static int imx6ul_tsc_remove(struct platform_device *pdev) > +{ > + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); > + > + clk_disable_unprepare(tsc->tsc_clk); > + clk_disable_unprepare(tsc->adc_clk); Just cutting clocks is not really nice. Why don't you shut down the device as you do in suspend, before disabling the clocks. > + input_unregister_device(tsc->input); > + kfree(tsc); > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP Drop ifdef. > +static int imx6ul_tsc_suspend(struct device *dev) __maybe_unused. > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); > + 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); > + > + clk_disable_unprepare(tsc->tsc_clk); > + clk_disable_unprepare(tsc->adc_clk); > + > + return 0; > +} > + > +static int imx6ul_tsc_resume(struct device *dev) __maybe_unused. > +{ > + 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) Disable tsc->adc_clk? > + return err; > + > + imx6ul_tsc_init(tsc); > + return 0; > +} > +#endif > + > +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@freescale.com>"); > +MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 >
Hi Dmitry, Thanks for your careful review! My comments is following. Best Regards Haibo Chen > -----Original Message----- > From: Dmitry Torokhov [mailto:dmitry.torokhov@gmail.com] > Sent: Tuesday, July 28, 2015 6:05 AM > To: Chen Haibo-B51421 > Cc: robh+dt@kernel.org; pawel.moll@arm.com; mark.rutland@arm.com; > ijc+devicetree@hellion.org.uk; galak@codeaurora.org; shawnguo@kernel.org; > kernel@pengutronix.de; linux@arm.linux.org.uk; hans.verkuil@cisco.com; > hadess@hadess.net; mchehab@osg.samsung.com; mamlinav@gmail.com; > arnd@arndb.de; jonathar@broadcom.com; hdegoede@redhat.com; > christian.gmeiner@gmail.com; scott.liu@emc.com.tw; geert@linux-m68k.org; > benjamin.tissoires@redhat.com; sebastien.szymanski@armadeus.com; > sbranden@broadcom.com; devicetree@vger.kernel.org; linux- > kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux- > input@vger.kernel.org > Subject: Re: [PATCH 1/5] input: touchscreen: add imx6ul_tsc driver > support > > Hi Haibo, > > On Mon, Jul 27, 2015 at 07:26:43PM +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@freescale.com> > > --- > > drivers/input/touchscreen/Kconfig | 12 + > > drivers/input/touchscreen/Makefile | 1 + > > drivers/input/touchscreen/imx6ul_tsc.c | 510 > > +++++++++++++++++++++++++++++++++ > > 3 files changed, 523 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..5a5a368 > > --- /dev/null > > +++ b/drivers/input/touchscreen/imx6ul_tsc.c > > @@ -0,0 +1,510 @@ > > +/* > > + * 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) > > + > > +/* 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 tsc_irq; > > + int adc_irq; > > You do not need to store tsc_irq and adc_irq since you do not reference > them anywhere but in probe(). > [haibo] yes, you are right, I will remove these and just add these values in probe() > > + int value; > > Why do we need this? [haibo] in tsc_irq(), I use this value to record the tsc measure value. But now I find the value just used In tsc_irq, so I will remove this value out of imx6ul_tsc. > > > + 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); } > > + > > +/* > > + * 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(int irq, void *dev_id) { > > + struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id; > > + int status; > > + 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) { > > + tsc->value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE); > > + x = (tsc->value >> 16) & 0x0fff; > > + y = tsc->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(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; > > + > > + tsc = kzalloc(sizeof(struct imx6ul_tsc), GFP_KERNEL); > > Why not devm_kzalloc()? > [haibo] It's better to use devm_kzalloc(), I will change this. > > + if (!tsc) { > > + err = -ENOMEM; > > + goto err_free_mem_tsc; > > + } > > + > > + input_dev = input_allocate_device(); > > devm_input_allocate_device(&pdev->dev)? > [haibo] will change this. > > > + if (!input_dev) { > > + err = -ENOMEM; > > + goto err_free_mem; > > + } > > + > > + 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"); > > + goto err_free_mem; > > + } > > + > > + 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); > > + goto err_free_mem; > > + } > > + > > + 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); > > + goto err_free_mem; > > + } > > + > > + 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); > > + goto err_free_mem; > > + } > > + > > + 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); > > + goto err_free_mem; > > + } > > + > > + tsc->tsc_irq = platform_get_irq(pdev, 0); > > + if (tsc->tsc_irq <= 0) { > > + dev_err(&pdev->dev, "no tsc irq resource?\n"); > > + err = -EINVAL; > > + goto err_free_mem; > > + } > > + > > + tsc->adc_irq = platform_get_irq(pdev, 1); > > + if (tsc->adc_irq <= 0) { > > + dev_err(&pdev->dev, "no adc irq resource?\n"); > > + err = -EINVAL; > > I think platform_get_irq() return negative errors, so let's check for > tsc->adc_irq < 0 and do: > > return tsc->adc_irq? [haibo] Good suggestion! I will take this. > > > + goto err_free_mem; > > + } > > + > > + err = devm_request_threaded_irq(tsc->dev, tsc->tsc_irq, > > + NULL, tsc_irq, > > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > > Do we need to hard-code the trigger? Maybe rely on board/OF code to set > up the trigger flags properly? > [haibo] this tsc is inside the imx6ul soc, it do not relay on board. > > + dev_name(&pdev->dev), tsc); > > + if (err < 0) { > > + dev_err(&pdev->dev, > > + "failed requesting tsc irq %d\n", > > + tsc->tsc_irq); > > + goto err_free_mem; > > + } > > + > > + err = devm_request_irq(tsc->dev, tsc->adc_irq, > > + adc_irq, 0, > > + dev_name(&pdev->dev), tsc); > > + if (err < 0) { > > + dev_err(&pdev->dev, > > + "failed requesting adc irq %d\n", > > + tsc->adc_irq); > > + goto err_free_mem; > > + } > > + > > + 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"); > > + goto err_free_mem; > > + } > > + > > + 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); > > +err_free_mem: > > + input_free_device(tsc->input); > > +err_free_mem_tsc: > > + kfree(tsc); > > + return err; > > +} > > + > > +static int imx6ul_tsc_remove(struct platform_device *pdev) { > > + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); > > + > > + clk_disable_unprepare(tsc->tsc_clk); > > + clk_disable_unprepare(tsc->adc_clk); > > Just cutting clocks is not really nice. Why don't you shut down the > device as you do in suspend, before disabling the clocks. [haibo] Yes, you are right, it's my negligence. > > > + input_unregister_device(tsc->input); > > + kfree(tsc); > > + > > + return 0; > > +} > > + > > +#ifdef CONFIG_PM_SLEEP > > Drop ifdef. > > > +static int imx6ul_tsc_suspend(struct device *dev) > > __maybe_unused. > > > +{ > > + struct platform_device *pdev = to_platform_device(dev); > > + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); > > + 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); > > + > > + clk_disable_unprepare(tsc->tsc_clk); > > + clk_disable_unprepare(tsc->adc_clk); > > + > > + return 0; > > +} > > + > > +static int imx6ul_tsc_resume(struct device *dev) > > __maybe_unused. > [haibo] will add this . > > +{ > > + 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) > > Disable tsc->adc_clk? > [haibo] will add this. > > + return err; > > + > > + imx6ul_tsc_init(tsc); > > + return 0; > > +} > > +#endif > > + > > +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@freescale.com>"); > > +MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller > > +driver"); MODULE_LICENSE("GPL v2"); > > -- > > 1.9.1 > > > > -- > Dmitry
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..5a5a368 --- /dev/null +++ b/drivers/input/touchscreen/imx6ul_tsc.c @@ -0,0 +1,510 @@ +/* + * 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) + +/* 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 tsc_irq; + int adc_irq; + int value; + 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); +} + +/* + * 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(int irq, void *dev_id) +{ + struct imx6ul_tsc *tsc = (struct imx6ul_tsc *)dev_id; + int status; + 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) { + tsc->value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE); + x = (tsc->value >> 16) & 0x0fff; + y = tsc->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(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; + + tsc = kzalloc(sizeof(struct imx6ul_tsc), GFP_KERNEL); + if (!tsc) { + err = -ENOMEM; + goto err_free_mem_tsc; + } + + input_dev = input_allocate_device(); + if (!input_dev) { + err = -ENOMEM; + goto err_free_mem; + } + + 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"); + goto err_free_mem; + } + + 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); + goto err_free_mem; + } + + 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); + goto err_free_mem; + } + + 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); + goto err_free_mem; + } + + 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); + goto err_free_mem; + } + + tsc->tsc_irq = platform_get_irq(pdev, 0); + if (tsc->tsc_irq <= 0) { + dev_err(&pdev->dev, "no tsc irq resource?\n"); + err = -EINVAL; + goto err_free_mem; + } + + tsc->adc_irq = platform_get_irq(pdev, 1); + if (tsc->adc_irq <= 0) { + dev_err(&pdev->dev, "no adc irq resource?\n"); + err = -EINVAL; + goto err_free_mem; + } + + err = devm_request_threaded_irq(tsc->dev, tsc->tsc_irq, + NULL, tsc_irq, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + dev_name(&pdev->dev), tsc); + if (err < 0) { + dev_err(&pdev->dev, + "failed requesting tsc irq %d\n", + tsc->tsc_irq); + goto err_free_mem; + } + + err = devm_request_irq(tsc->dev, tsc->adc_irq, + adc_irq, 0, + dev_name(&pdev->dev), tsc); + if (err < 0) { + dev_err(&pdev->dev, + "failed requesting adc irq %d\n", + tsc->adc_irq); + goto err_free_mem; + } + + 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"); + goto err_free_mem; + } + + 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); +err_free_mem: + input_free_device(tsc->input); +err_free_mem_tsc: + kfree(tsc); + return err; +} + +static int imx6ul_tsc_remove(struct platform_device *pdev) +{ + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); + + clk_disable_unprepare(tsc->tsc_clk); + clk_disable_unprepare(tsc->adc_clk); + input_unregister_device(tsc->input); + kfree(tsc); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int imx6ul_tsc_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct imx6ul_tsc *tsc = platform_get_drvdata(pdev); + 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); + + clk_disable_unprepare(tsc->tsc_clk); + clk_disable_unprepare(tsc->adc_clk); + + return 0; +} + +static int 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) + return err; + + imx6ul_tsc_init(tsc); + return 0; +} +#endif + +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@freescale.com>"); +MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver"); +MODULE_LICENSE("GPL v2");
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> --- drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/imx6ul_tsc.c | 510 +++++++++++++++++++++++++++++++++ 3 files changed, 523 insertions(+) create mode 100644 drivers/input/touchscreen/imx6ul_tsc.c