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HID: add backlight support to PicoLCD device 

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>
hifive-unleashed-5.1
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
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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);