Commit 1a26c920 authored by Robin van der Gracht's avatar Robin van der Gracht Committed by Dmitry Torokhov
Browse files

Input: snvs_pwrkey - send key events for i.MX6 S, DL and Q 



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: default avatarRobin van der Gracht <robin@protonic.nl>
Link: https://lore.kernel.org/r/20191125161210.8275-1-robin@protonic.nl


Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 71c296f6

drivers/input/keyboard/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -450,7 +450,7 @@ 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.

drivers/input/keyboard/snvs_pwrkey.c

+33 −11
Original line number Diff line number Diff line
@@ -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;
@@ -121,6 +140,9 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev) 
	if (pdata->irq < 0)

		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 */

CRA Git | Maintained and supported by SUSTech CRA and CCSE