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Message-ID: <20190828091550.pdc57wanu6twew5p@pengutronix.de>
Date: Wed, 28 Aug 2019 11:15:50 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Robin van der Gracht <robin@...tonic.nl>
Cc: Robin Gong <yibin.gong@....com>,
Mark Rutland <mark.rutland@....com>,
"devicetree @ vger . kernel . org" <devicetree@...r.kernel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
"linux-kernel @ vger . kernel . org" <linux-kernel@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
dl-linux-imx <linux-imx@....com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
"linux-input @ vger . kernel . org" <linux-input@...r.kernel.org>,
Adam Ford <aford173@...il.com>,
Fabio Estevam <festevam@...il.com>,
"linux-arm-kernel @ lists . infradead . org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/2] input: keyboard: snvs_pwrkey: Send key events for
i.MX6 S, DL and Q
Hi Robin,
thanks for the patch.
On 19-08-27 14:32, 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>
> ---
> .../devicetree/bindings/crypto/fsl-sec4.txt | 16 ++++--
> drivers/input/keyboard/Kconfig | 2 +-
> drivers/input/keyboard/snvs_pwrkey.c | 52 ++++++++++++++++---
Can we split this so the dt-bindings are a standalone patch? IMHO this
is the usual way because the maintainer can squash them on there needs.
Also it would be cool to document the changes. A common place for
changes is after the '---' or on the cover-letter.
> 3 files changed, 57 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
> index 2fe245ca816a..e4fbb9797082 100644
> --- a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
> +++ b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
> @@ -420,14 +420,22 @@ EXAMPLE
> =====================================================================
> System ON/OFF key driver
>
> - The snvs-pwrkey is designed to enable POWER key function which controlled
> - by SNVS ONOFF, the driver can report the status of POWER key and wakeup
> - system if pressed after system suspend.
> + The snvs-pwrkey is designed to enable POWER key function which is controlled
> + by SNVS ONOFF. It can wakeup the system if pressed after system suspend.
> +
> + There are two generations of SVNS pwrkey hardware. The first generation is
> + included in i.MX6 Solo, DualLite and Quad processors. The second generation
> + is included in i.MX6 SoloX and newer SoCs.
> +
> + Second generation SNVS can detect and report the status of POWER key, but the
> + first generation can only detect a key release and so emits an instantaneous
> + press and release event when the key is released.
>
> - compatible:
> Usage: required
> Value type: <string>
> - Definition: Mush include "fsl,sec-v4.0-pwrkey".
> + Definition: Must include "fsl,sec-v4.0-pwrkey" for i.MX6 SoloX and newer
> + or "fsl,imx6qdl-snvs-pwrkey" for older SoCs.
>
> - interrupts:
> Usage: required
> 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..d71c44733103 100644
> --- a/drivers/input/keyboard/snvs_pwrkey.c
> +++ b/drivers/input/keyboard/snvs_pwrkey.c
> @@ -29,6 +29,11 @@
> #define DEBOUNCE_TIME 30
> #define REPEAT_INTERVAL 60
>
> +enum imx_snvs_hwtype {
> + IMX6SX_SNVS, /* i.MX6 SoloX and newer */
> + IMX6QDL_SNVS, /* i.MX6 Solo, DualLite and Quad */
> +};
> +
> struct pwrkey_drv_data {
> struct regmap *snvs;
> int irq;
> @@ -37,14 +42,41 @@ struct pwrkey_drv_data {
> int wakeup;
> struct timer_list check_timer;
> struct input_dev *input;
> + enum imx_snvs_hwtype hwtype;
> };
>
> +static const struct of_device_id imx_snvs_pwrkey_ids[] = {
> + {
> + .compatible = "fsl,sec-v4.0-pwrkey",
> + .data = (const void *)IMX6SX_SNVS,
> + },
> + {
> + .compatible = "fsl,imx6qdl-snvs-pwrkey",
> + .data = (const void *)IMX6QDL_SNVS,
> + },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
Can we keep this on the original place if you are using ...
> +
> static void imx_imx_snvs_check_for_events(struct timer_list *t)
> {
> struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
> struct input_dev *input = pdata->input;
> u32 state;
>
> + if (pdata->hwtype == IMX6QDL_SNVS) {
> + /*
> + * 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);
Missing input_sync() here?
> + input_report_key(input, pdata->keycode, 0);
> + input_sync(input);
> + pm_relax(input->dev.parent);
> + return;
> + }
> +
> regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
> state = state & SNVS_HPSR_BTN ? 1 : 0;
>
> @@ -67,13 +99,17 @@ 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);
> + unsigned long expire = jiffies;
> u32 lp_status;
>
> pm_wakeup_event(pdata->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->hwtype == IMX6SX_SNVS)
> + expire += msecs_to_jiffies(DEBOUNCE_TIME);
> + mod_timer(&pdata->check_timer, expire);
Is this desired because the timer gets triggered earlier.
> + }
>
> /* clear SPO status */
> regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
> @@ -93,6 +129,7 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
> struct pwrkey_drv_data *pdata = NULL;
> struct input_dev *input = NULL;
> struct device_node *np;
> + const struct of_device_id *match;
> int error;
>
> /* Get SNVS register Page */
> @@ -100,6 +137,10 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
> if (!np)
> return -ENODEV;
>
> + match = of_match_node(imx_snvs_pwrkey_ids, np);
> + if (!match)
> + return -ENODEV;
... of_device_get_match_data() here. While reading the rm it seems that
the snvs block has a dedicated version register. IMHO this could be a
better way to apply the change also to existing devices with old
firmware.
Regards,
Marco
> +
> pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> if (!pdata)
> return -ENOMEM;
> @@ -115,6 +156,7 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
> dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
> }
>
> + pdata->hwtype = (enum imx_snvs_hwtype)match->data;
> pdata->wakeup = of_property_read_bool(np, "wakeup-source");
>
> pdata->irq = platform_get_irq(pdev, 0);
> @@ -175,12 +217,6 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
> return 0;
> }
>
> -static const struct of_device_id imx_snvs_pwrkey_ids[] = {
> - { .compatible = "fsl,sec-v4.0-pwrkey" },
> - { /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
> -
> static struct platform_driver imx_snvs_pwrkey_driver = {
> .driver = {
> .name = "snvs_pwrkey",
> --
> 2.20.1
>
>
>
--
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