[PATCH v3] input: keyboard: snvs_pwrkey: Send key events for i.MX6 S, DL and Q
From: Robin van der Gracht <robin@protonic.nl>
Date: 2019-09-04 06:23:35
Also in:
linux-arm-kernel, lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
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> --- 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 <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)
@@ -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); + } /* clear SPO status */ regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
@@ -94,6 +114,7 @@ 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 +144,9 @@ 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