From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH v3] input: keyboard: snvs_pwrkey: Send key events for i.MX6 S, DL and Q Date: Thu, 12 Sep 2019 21:13:00 +0100 Message-ID: <20190912201300.GA636@penguin> References: <20190904062329.97520-1-robin@protonic.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20190904062329.97520-1-robin@protonic.nl> Sender: linux-kernel-owner@vger.kernel.org To: Robin van der Gracht Cc: "linux-input @ vger . kernel . org" , "linux-kernel @ vger . kernel . org" , RobinGong , Pengutronix Kernel Team , Marco Felsch , Shawn Guo , Adam Ford , "linux-arm-kernel @ lists . infradead . org" List-Id: linux-input@vger.kernel.org Hi Robin, On Wed, Sep 04, 2019 at 06:23:29AM +0000, 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 > --- > > Changes v2 -> v3: > - Drop alt compatible string for identifying first revision snvs hardware, > read minor revision from register instead. > - Drop imx6qdl.dtsi modification and device-tree binding documentation. > - Add an additional input_sync() to create 2 seperate input reports for press > and release. > > drivers/input/keyboard/Kconfig | 2 +- > drivers/input/keyboard/snvs_pwrkey.c | 28 ++++++++++++++++++++++++++-- > 2 files changed, 27 insertions(+), 3 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..828580eee0d2 100644 > --- a/drivers/input/keyboard/snvs_pwrkey.c > +++ b/drivers/input/keyboard/snvs_pwrkey.c > @@ -19,6 +19,7 @@ > #include > #include > > +#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) > @@ -45,6 +47,20 @@ static void imx_imx_snvs_check_for_events(struct timer_list *t) > struct input_dev *input = pdata->input; > u32 state; > > + 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); > + return; > + } > + > regmap_read(pdata->snvs, SNVS_HPSR_REG, &state); > state = state & SNVS_HPSR_BTN ? 1 : 0; > > @@ -67,13 +83,17 @@ 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->minor_rev > 0) > + expire = jiffies + msecs_to_jiffies(DEBOUNCE_TIME); > + mod_timer(&pdata->check_timer, expire); Why do we even need to fire the timer in case of the first generation hardware? Just send press and release events directly from the ISR. Thanks. -- Dmitry