diff options
| -rw-r--r-- | drivers/hid/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/hid/hid-picolcd.c | 106 |
2 files changed, 107 insertions, 1 deletions
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 588b9acecb7a..399edc53963e 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -279,8 +279,8 @@ config HID_PICOLCD - Switching between Firmware and Flash mode - Framebuffer for monochrome 256x64 display - Backlight control (needs CONFIG_BACKLIGHT_CLASS_DEVICE) + - Contrast control (needs CONFIG_LCD_CLASS_DEVICE) Features that are not (yet) supported: - - Contrast control - IR - General purpose outputs - EEProm / Flash access diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c index 0ea7a3f44bb5..99a488363a4e 100644 --- a/drivers/hid/hid-picolcd.c +++ b/drivers/hid/hid-picolcd.c @@ -27,6 +27,7 @@ #include <linux/fb.h> #include <linux/vmalloc.h> #include <linux/backlight.h> +#include <linux/lcd.h> #include <linux/seq_file.h> #include <linux/debugfs.h> @@ -184,6 +185,10 @@ struct picolcd_data { struct fb_info *fb_info; struct fb_deferred_io fb_defio; #endif /* CONFIG_FB */ +#if defined(CONFIG_LCD_CLASS_DEVICE) || defined(CONFIG_LCD_CLASS_DEVICE_MODULE) + struct lcd_device *lcd; + u8 lcd_contrast; +#endif #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) struct backlight_device *backlight; u8 lcd_brightness; @@ -849,6 +854,99 @@ static inline int picolcd_resume_backlight(struct picolcd_data *data) } #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ +#if defined(CONFIG_LCD_CLASS_DEVICE) || defined(CONFIG_LCD_CLASS_DEVICE_MODULE) +/* + * lcd class device + */ +static int picolcd_get_contrast(struct lcd_device *ldev) +{ + struct picolcd_data *data = lcd_get_data(ldev); + return data->lcd_contrast; +} + +static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) +{ + struct picolcd_data *data = lcd_get_data(ldev); + struct hid_report *report = picolcd_out_report(REPORT_CONTRAST, data->hdev); + unsigned long flags; + + if (!report || report->maxfield != 1 || report->field[0]->report_count != 1) + return -ENODEV; + + data->lcd_contrast = contrast & 0x0ff; + spin_lock_irqsave(&data->lock, flags); + hid_set_field(report->field[0], 0, data->lcd_contrast); + usbhid_submit_report(data->hdev, report, USB_DIR_OUT); + spin_unlock_irqrestore(&data->lock, flags); + return 0; +} + +static int picolcd_check_lcd_fb(struct lcd_device *ldev, struct fb_info *fb) +{ + return fb && fb == picolcd_fbinfo((struct picolcd_data *)lcd_get_data(ldev)); +} + +static struct lcd_ops picolcd_lcdops = { + .get_contrast = picolcd_get_contrast, + .set_contrast = picolcd_set_contrast, + .check_fb = picolcd_check_lcd_fb, +}; + +static int picolcd_init_lcd(struct picolcd_data *data, struct hid_report *report) +{ + struct device *dev = &data->hdev->dev; + struct lcd_device *ldev; + + if (!report) + return -ENODEV; + if (report->maxfield != 1 || report->field[0]->report_count != 1 || + report->field[0]->report_size != 8) { + dev_err(dev, "unsupported CONTRAST report"); + return -EINVAL; + } + + ldev = lcd_device_register(dev_name(dev), dev, data, &picolcd_lcdops); + if (IS_ERR(ldev)) { + dev_err(dev, "failed to register LCD\n"); + return PTR_ERR(ldev); + } + ldev->props.max_contrast = 0x0ff; + data->lcd_contrast = 0xe5; + data->lcd = ldev; + picolcd_set_contrast(ldev, 0xe5); + return 0; +} + +static void picolcd_exit_lcd(struct picolcd_data *data) +{ + struct lcd_device *ldev = data->lcd; + + data->lcd = NULL; + if (ldev) + lcd_device_unregister(ldev); +} + +static inline int picolcd_resume_lcd(struct picolcd_data *data) +{ + if (!data->lcd) + return 0; + return picolcd_set_contrast(data->lcd, data->lcd_contrast); +} +#else +static inline int picolcd_init_lcd(struct picolcd_data *data, + struct hid_report *report) +{ + return 0; +} +static inline void picolcd_exit_lcd(struct picolcd_data *data) +{ +} +static inline int picolcd_resume_lcd(struct picolcd_data *data) +{ + return 0; +} +#endif /* CONFIG_LCD_CLASS_DEVICE */ + /* * input class device */ @@ -984,6 +1082,7 @@ static int picolcd_reset(struct hid_device *hdev) if (error) return error; + picolcd_resume_lcd(data); picolcd_resume_backlight(data); #if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE) if (data->fb_info) @@ -1673,6 +1772,11 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data) if (error) goto err; + /* Setup lcd class device */ + error = picolcd_init_lcd(data, picolcd_out_report(REPORT_CONTRAST, hdev)); + if (error) + goto err; + /* Setup backlight class device */ error = picolcd_init_backlight(data, picolcd_out_report(REPORT_BRIGHTNESS, hdev)); if (error) @@ -1688,6 +1792,7 @@ static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data) return 0; err: picolcd_exit_backlight(data); + picolcd_exit_lcd(data); picolcd_exit_framebuffer(data); picolcd_exit_cir(data); picolcd_exit_keys(data); @@ -1820,6 +1925,7 @@ static void picolcd_remove(struct hid_device *hdev) /* Clean up the framebuffer */ picolcd_exit_backlight(data); + picolcd_exit_lcd(data); picolcd_exit_framebuffer(data); /* Cleanup input */ picolcd_exit_cir(data); |