Add PM support in order to turn off backlight on suspend, restore
it on resume and especially restore complete state on reset-resume.
Signed-off-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
---
drivers/hid/hid-picolcd.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index aa6f2e1..c652390 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -852,6 +852,20 @@ static inline int picolcd_resume_backlight(struct picolcd_data *data)
return picolcd_set_brightness(data->backlight);
}
+#ifdef CONFIG_PM
+static void picolcd_suspend_backlight(struct picolcd_data *data)
+{
+ int bl_power = data->lcd_power;
+ if (!data->backlight)
+ return;
+
+ data->backlight->props.power = FB_BLANK_POWERDOWN;
+ picolcd_set_brightness(data->backlight);
+ data->lcd_power = data->backlight->props.power = bl_power;
+}
+#else
+#define picolcd_suspend_backlight(a)
+#endif /* CONFIG_PM */
#else
static inline int picolcd_init_backlight(struct picolcd_data *data,
struct hid_report *report)
@@ -865,6 +879,7 @@ static inline int picolcd_resume_backlight(struct picolcd_data *data)
{
return 0;
}
+#define picolcd_suspend_backlight(a)
#endif /* CONFIG_HID_PICOLCD_BACKLIGHT */
#ifdef CONFIG_HID_PICOLCD_LCD
@@ -2259,6 +2274,46 @@ static int picolcd_raw_event(struct hid_device *hdev,
return 1;
}
+#ifdef CONFIG_PM
+static int picolcd_suspend(struct hid_device *hdev, pm_message_t message)
+{
+ if (message.event & PM_EVENT_AUTO)
+ return 0;
+
+ picolcd_suspend_backlight(hid_get_drvdata(hdev));
+ dbg_hid(PICOLCD_NAME " device ready for suspend\n");
+ return 0;
+}
+
+static int picolcd_resume(struct hid_device *hdev)
+{
+ int ret;
+ ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
+ if (ret)
+ dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
+ return 0;
+}
+
+static int picolcd_reset_resume(struct hid_device *hdev)
+{
+ int ret;
+ ret = picolcd_reset(hdev);
+ if (ret)
+ dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
+ ret = picolcd_fb_reset(hid_get_drvdata(hdev), 0);
+ if (ret)
+ dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
+ ret = picolcd_resume_lcd(hid_get_drvdata(hdev));
+ if (ret)
+ dbg_hid(PICOLCD_NAME " restoring lcd failed: %d\n", ret);
+ ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
+ if (ret)
+ dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
+ picolcd_leds_set(hid_get_drvdata(hdev));
+ return 0;
+}
+#endif
+
/* initialize keypad input device */
static int picolcd_init_keys(struct picolcd_data *data,
struct hid_report *report)
@@ -2544,6 +2599,11 @@ static struct hid_driver picolcd_driver = {
.probe = picolcd_probe,
.remove = picolcd_remove,
.raw_event = picolcd_raw_event,
+#ifdef CONFIG_PM
+ .suspend = picolcd_suspend,
+ .resume = picolcd_resume,
+ .reset_resume = picolcd_reset_resume,
+#endif
};
static int __init picolcd_init(void)
--
1.6.4.4
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