AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

HID: add backlight support to PicoLCD device

Browse Source 
Add backlight support to PicoLCD device.

Backlight support depends on backlight class and is only being
compiled if backlight class has been selected.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Bruno Prémont 2010-03-30 22:35:27 +02:00 committed by Jiri Kosina
parent b8c21cf697
commit f1c2176140
2 changed files with 115 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/hid/Kconfig
View File

@ -278,8 +278,8 @@ config HID_PICOLCD
- Keypad
- Switching between Firmware and Flash mode
- Framebuffer for monochrome 256x64 display
- Backlight control (needs CONFIG_BACKLIGHT_CLASS_DEVICE)
Features that are not (yet) supported:
- Backlight control
- Contrast control
- IR
- General purpose outputs

115
drivers/hid/hid-picolcd.c
View File

@ -26,6 +26,7 @@
#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <linux/backlight.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
@ -183,6 +184,11 @@ struct picolcd_data {
struct fb_info *fb_info;
struct fb_deferred_io fb_defio;
#endif /* CONFIG_FB */
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
struct backlight_device *backlight;
u8 lcd_brightness;
u8 lcd_power;
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/* Housekeeping stuff */
spinlock_t lock;
@ -729,7 +735,7 @@ static void picolcd_exit_framebuffer(struct picolcd_data *data)
kfree(fb_vbitmap);
}
#define picolcd_fbinfo(d) ((d)->fb_info)
#else
static inline int picolcd_fb_reset(struct picolcd_data *data, int clear)
{
@ -742,8 +748,107 @@ static inline int picolcd_init_framebuffer(struct picolcd_data *data)
static void picolcd_exit_framebuffer(struct picolcd_data *data)
{
}
#define picolcd_fbinfo(d) NULL
#endif /* CONFIG_FB */
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)
/*
* backlight class device
*/
static int picolcd_get_brightness(struct backlight_device *bdev)
{
struct picolcd_data *data = bl_get_data(bdev);
return data->lcd_brightness;
}
static int picolcd_set_brightness(struct backlight_device *bdev)
{
struct picolcd_data *data = bl_get_data(bdev);
struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev);
unsigned long flags;
if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
return -ENODEV;
data->lcd_brightness = bdev->props.brightness & 0x0ff;
data->lcd_power = bdev->props.power;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb)
{
return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev));
}
static const struct backlight_ops picolcd_blops = {
.update_status = picolcd_set_brightness,
.get_brightness = picolcd_get_brightness,
.check_fb = picolcd_check_bl_fb,
};
static int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report)
{
struct device *dev = &data->hdev->dev;
struct backlight_device *bdev;
struct backlight_properties props;
if (!report)
return -ENODEV;
if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
report->field[0]->report_size != 8) {
dev_err(dev, "unsupported BRIGHTNESS report");
return -EINVAL;
}
memset(&props, 0, sizeof(props));
props.max_brightness = 0xff;
bdev = backlight_device_register(dev_name(dev), dev, data,
&picolcd_blops, &props);
if (IS_ERR(bdev)) {
dev_err(dev, "failed to register backlight\n");
return PTR_ERR(bdev);
}
bdev->props.brightness = 0xff;
data->lcd_brightness = 0xff;
data->backlight = bdev;
picolcd_set_brightness(bdev);
return 0;
}
static void picolcd_exit_backlight(struct picolcd_data *data)
{
struct backlight_device *bdev = data->backlight;
data->backlight = NULL;
if (bdev)
backlight_device_unregister(bdev);
}
static inline int picolcd_resume_backlight(struct picolcd_data *data)
{
if (!data->backlight)
return 0;
return picolcd_set_brightness(data->backlight);
}
#else
static inline int picolcd_init_backlight(struct picolcd_data *data,
struct hid_report *report)
{
return 0;
}
static inline void picolcd_exit_backlight(struct picolcd_data *data)
{
}
static inline int picolcd_resume_backlight(struct picolcd_data *data)
{
return 0;
}
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/*
* input class device
*/
@ -879,6 +984,7 @@ static int picolcd_reset(struct hid_device *hdev)
if (error)
return error;
picolcd_resume_backlight(data);
#if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
if (data->fb_info)
schedule_delayed_work(&data->fb_info->deferred_work, 0);
@ -1567,6 +1673,11 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
if (error)
goto err;
/* Setup backlight class device */
error = picolcd_init_backlight(data, picolcd_out_report(REPORT_BRIGHTNESS, hdev));
if (error)
goto err;
#ifdef CONFIG_DEBUG_FS
report = picolcd_out_report(REPORT_READ_MEMORY, hdev);
if (report && report->maxfield == 1 && report->field[0]->report_size == 8)
@ -1576,6 +1687,7 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
#endif
return 0;
err:
picolcd_exit_backlight(data);
picolcd_exit_framebuffer(data);
picolcd_exit_cir(data);
picolcd_exit_keys(data);
@ -1707,6 +1819,7 @@ static void picolcd_remove(struct hid_device *hdev)
spin_unlock_irqrestore(&data->lock, flags);
/* Clean up the framebuffer */
picolcd_exit_backlight(data);
picolcd_exit_framebuffer(data);
/* Cleanup input */
picolcd_exit_cir(data);