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Message-ID: <20100330223607.5bd5c3a8@neptune.home>
Date: Tue, 30 Mar 2010 22:36:07 +0200
From: Bruno Prémont <bonbons@...ux-vserver.org>
To: Jiri Kosina <jkosina@...e.cz>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
Nicu Pavel <npavel@...ner.com>,
Oliver Neukum <oliver@...kum.org>,
Jaya Kumar <jayakumar.lkml@...il.com>
Subject: [PATCH v6 4/8] hid: add lcd support to PicoLCD device
Add lcd support to PicoLCD device.
LCD support depends on lcd class and is only being
compiled if lcd class has been selected.
Changes since v3:
- Moved PM support to separate patch
Changes since v2:
- Drop inline keyword on non-stub functions
Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
---
drivers/hid/Kconfig | 2 +-
drivers/hid/hid-picolcd.c | 106 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 107 insertions(+), 1 deletions(-)
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 588b9ac..399edc5 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 4d5fc2d..9f2c859 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;
@@ -862,6 +867,99 @@ static void picolcd_suspend_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
*/
@@ -997,6 +1095,7 @@ 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)
@@ -1686,6 +1785,11 @@ 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)
@@ -1701,6 +1805,7 @@ 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);
@@ -1833,6 +1938,7 @@ 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);
--
1.6.4.4
--
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