Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-02 09:01:34 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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@protonic.nl>
Link: https://lore.kernel.org/r/20191125161210.8275-1-robin@protonic.nl
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Robin van der Gracht 2019-11-25 12:40:47 -08:00 committed by Dmitry Torokhov
parent 71c296f6d5
commit 1a26c92071
2 changed files with 34 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/input/keyboard/Kconfig
View File

@ -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.

44
drivers/input/keyboard/snvs_pwrkey.c
View File

@ -19,15 +19,16 @@
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#define SNVS_LPSR_REG 0x4C /* LP Status Register */
#define SNVS_LPCR_REG 0x38 /* LP Control Register */
#define SNVS_HPSR_REG 0x14
#define SNVS_HPSR_BTN BIT(6)
#define SNVS_LPSR_SPO BIT(18)
#define SNVS_LPCR_DEP_EN BIT(5)
#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
#define SNVS_HPSR_BTN BIT(6)
#define SNVS_LPSR_SPO BIT(18)
#define SNVS_LPCR_DEP_EN BIT(5)
#define DEBOUNCE_TIME 30
#define REPEAT_INTERVAL 60
#define DEBOUNCE_TIME 30
#define REPEAT_INTERVAL 60
struct pwrkey_drv_data {
struct regmap *snvs;
@ -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 */