linux-kernel - Re: [PATCH v4] input: keyboard: snvs_pwrkey: Send key events for i.MX6 S, DL and Q

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Date:   Mon, 25 Nov 2019 13:13:26 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Robin van der Gracht <robin@...tonic.nl>
Cc:     "linux-input @ vger . kernel . org" <linux-input@...r.kernel.org>,
        "linux-kernel @ vger . kernel . org" <linux-kernel@...r.kernel.org>,
        RobinGong <yibin.gong@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Adam Ford <aford173@...il.com>,
        "linux-arm-kernel @ lists . infradead . org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4] input: keyboard: snvs_pwrkey: Send key events for
 i.MX6 S, DL and Q

On Mon, Nov 25, 2019 at 05:12:10PM +0100, Robin van der Gracht wrote:
> The first generation i.MX6 processors does not send an interrupt when the
> power key is pressed. It sends a power down request interrupt if the key is
> released before a hard shutdown (5 second press). This should allow
> software to bring down the SoC safely.
> 
> For this driver to work as a regular power key with the older SoCs, we need
> to send a keypress AND release when we get the power down request irq.
> 
> Signed-off-by: Robin van der Gracht <robin@...tonic.nl>

Applied, thank you.

> ---
> 
> Changes v3 -> v4:
>  * The key release irq handler is now emitting the press and release
>    events directly, instead of the debounce timer handler.
> 
>  drivers/input/keyboard/Kconfig       |  2 +-
>  drivers/input/keyboard/snvs_pwrkey.c | 28 +++++++++++++++++++++++++---
>  2 files changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index 7c4f19dab34f..937e58da5ce1 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -436,7 +436,7 @@ config KEYBOARD_SNVS_PWRKEY
>  	depends on OF
>  	help
>  	  This is the snvs powerkey driver for the Freescale i.MX application
> -	  processors that are newer than i.MX6 SX.
> +	  processors.
>  
>  	  To compile this driver as a module, choose M here; the
>  	  module will be called snvs_pwrkey.
> diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
> index 5342d8d45f81..4888e137cc5d 100644
> --- a/drivers/input/keyboard/snvs_pwrkey.c
> +++ b/drivers/input/keyboard/snvs_pwrkey.c
> @@ -19,6 +19,7 @@
>  #include <linux/mfd/syscon.h>
>  #include <linux/regmap.h>
>  
> +#define SNVS_HPVIDR1_REG 0xF8
>  #define SNVS_LPSR_REG	0x4C	/* LP Status Register */
>  #define SNVS_LPCR_REG	0x38	/* LP Control Register */
>  #define SNVS_HPSR_REG	0x14
> @@ -37,6 +38,7 @@ struct pwrkey_drv_data {
>  	int wakeup;
>  	struct timer_list check_timer;
>  	struct input_dev *input;
> +	u8 minor_rev;
>  };
>  
>  static void imx_imx_snvs_check_for_events(struct timer_list *t)
> @@ -67,13 +69,29 @@ static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
>  {
>  	struct platform_device *pdev = dev_id;
>  	struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
> +	struct input_dev *input = pdata->input;
>  	u32 lp_status;
>  
> -	pm_wakeup_event(pdata->input->dev.parent, 0);
> +	pm_wakeup_event(input->dev.parent, 0);
>  
>  	regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
> -	if (lp_status & SNVS_LPSR_SPO)
> -		mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
> +	if (lp_status & SNVS_LPSR_SPO) {
> +		if (pdata->minor_rev == 0) {
> +			/*
> +			 * The first generation i.MX6 SoCs only sends an
> +			 * interrupt on button release. To mimic power-key
> +			 * usage, we'll prepend a press event.
> +			 */
> +			input_report_key(input, pdata->keycode, 1);
> +			input_sync(input);
> +			input_report_key(input, pdata->keycode, 0);
> +			input_sync(input);
> +			pm_relax(input->dev.parent);
> +		} else {
> +			mod_timer(&pdata->check_timer,
> +			          jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
> +		}
> +	}
>  
>  	/* clear SPO status */
>  	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
> @@ -94,6 +112,7 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
>  	struct input_dev *input = NULL;
>  	struct device_node *np;
>  	int error;
> +	u32 vid;
>  
>  	/* Get SNVS register Page */
>  	np = pdev->dev.of_node;
> @@ -123,6 +142,9 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> +	regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid);
> +	pdata->minor_rev = vid & 0xff;
> +
>  	regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
>  
>  	/* clear the unexpected interrupt before driver ready */
> -- 
> 2.20.1
> 

-- 
Dmitry