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greybus: arche-platform: Add wake detect state based on functionality

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If driver needs to process wake/detect events from SVC, by enabling
interrupt support on wake/detect event, it becomes easier to maintain
state of wake/detect line based on functionality.

Testing Done: Tested on DB3.5 platform.

Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Reviewed-by: Michael Scott <michael.scott@linaro.org>
Tested-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Vaibhav Hiremath 2016-02-25 04:37:35 +05:30 committed by Greg Kroah-Hartman
parent db5a3bca56
commit 685353c12e
1 changed files with 13 additions and 0 deletions
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13
drivers/staging/greybus/arche-platform.c
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@ -21,6 +21,15 @@
#include <linux/usb/usb3613.h>
enum svc_wakedetect_state {
WD_STATE_IDLE, /* Default state = pulled high/low */
WD_STATE_BOOT_INIT, /* WD = falling edge (low) */
WD_STATE_COLDBOOT_TRIG, /* WD = rising edge (high), > 30msec */
WD_STATE_STANDBYBOOT_TRIG, /* As of now not used ?? */
WD_STATE_COLDBOOT_START, /* Cold boot process started */
WD_STATE_STANDBYBOOT_START, /* Not used */
};
struct arche_platform_drvdata {
/* Control GPIO signals to and from AP <=> SVC */
int svc_reset_gpio;
@ -39,6 +48,8 @@ struct arche_platform_drvdata {
int num_apbs;
struct delayed_work delayed_work;
enum svc_wakedetect_state wake_detect_state;
struct device *dev;
};
@ -145,6 +156,7 @@ static void arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pda
/* Send disconnect/detach event to SVC */
gpio_set_value(arche_pdata->wake_detect_gpio, 0);
usleep_range(100, 200);
arche_pdata->wake_detect_state = WD_STATE_IDLE;
clk_disable_unprepare(arche_pdata->svc_ref_clk);
}
@ -328,6 +340,7 @@ static int arche_platform_probe(struct platform_device *pdev)
}
/* deassert wake detect */
gpio_direction_output(arche_pdata->wake_detect_gpio, 0);
arche_pdata->wake_detect_state = WD_STATE_IDLE;
arche_pdata->dev = &pdev->dev;