[PATCH 2/3] gspca pac7302: add LED control

["Németh Márton" <nm127@freemail.hu>]

From: Márton Németh <nm127@freemail.hu>

On Labtec Webcam 2200 there is a feedback LED which can be controlled
independent from the streaming. The feedback LED can be used from
user space application to show for example detected motion or to
distinguish between the preview and "on-air" state of the video stream.

The default value of the LED control is "Auto" which keeps the previous
behaviour: LED is off when the stream is off, LED is on if the stream is
on.

Signed-off-by: Márton Németh <nm127@freemail.hu>
---
diff -r d8fafa7d88dc linux/drivers/media/video/gspca/pac7302.c
--- a/linux/drivers/media/video/gspca/pac7302.c	Thu Feb 18 19:02:51 2010 +0100
+++ b/linux/drivers/media/video/gspca/pac7302.c	Sun Feb 28 08:41:17 2010 +0100
@@ -6,6 +6,7 @@
  *
  * Separated from Pixart PAC7311 library by Márton Németh
  * Camera button input handling by Márton Németh <nm127@freemail.hu>
+ * LED control by Márton Németh <nm127@freemail.hu>
  * Copyright (C) 2009-2010 Márton Németh <nm127@freemail.hu>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -62,6 +63,7 @@
     0   | 0xc6       | setwhitebalance()
     0   | 0xc7       | setbluebalance()
     0   | 0xdc       | setbrightcont(), setcolors()
+    1   | 0x78       | set_streaming_led()
     3   | 0x02       | setexposure()
     3   | 0x10       | setgain()
     3   | 0x11       | setcolors(), setgain(), setexposure(), sethvflip()
@@ -91,6 +93,7 @@
 	unsigned char gain;
 	unsigned char exposure;
 	unsigned char autogain;
+	unsigned char led;
 	__u8 hflip;
 	__u8 vflip;
 	u8 flags;
@@ -126,6 +129,8 @@
 static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val);
 static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
 static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setled(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getled(struct gspca_dev *gspca_dev, __s32 *val);

 static const struct ctrl sd_ctrls[] = {
 /* This control is pac7302 only */
@@ -293,6 +298,20 @@
 	    .set = sd_setvflip,
 	    .get = sd_getvflip,
 	},
+	{
+	    {
+		.id      = V4L2_CID_LED,
+		.type    = V4L2_CTRL_TYPE_MENU,
+		.name    = "LED",
+		.minimum = 0,
+		.maximum = 2,	/* 0: Auto, 1: On, 2: Off */
+		.step    = 1,
+#define LED_DEF V4L2_LED_AUTO
+		.default_value = LED_DEF,
+	    },
+	    .set = sd_setled,
+	    .get = sd_getled,
+	},
 };

 static const struct v4l2_pix_format vga_mode[] = {
@@ -572,6 +591,7 @@
 	sd->gain = GAIN_DEF;
 	sd->exposure = EXPOSURE_DEF;
 	sd->autogain = AUTOGAIN_DEF;
+	sd->led = LED_DEF;
 	sd->hflip = HFLIP_DEF;
 	sd->vflip = VFLIP_DEF;
 	sd->flags = id->driver_info;
@@ -716,6 +736,36 @@
 	reg_w(gspca_dev, 0x11, 0x01);
 }

+static void set_streaming_led(struct gspca_dev *gspca_dev, u8 streaming)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 data = 0;
+
+	switch (sd->led) {
+	case V4L2_LED_AUTO:
+		if (streaming)
+			data = 0x01;
+		else
+			data = 0x40;
+		break;
+	case V4L2_LED_ON:
+		if (streaming)
+			data = 0x01;
+		else
+			data = 0x00;
+		break;
+	case V4L2_LED_OFF:
+		if (streaming)
+			data = 0x41;
+		else
+			data = 0x40;
+		break;
+	}
+
+	reg_w(gspca_dev, 0xff, 0x01);
+	reg_w(gspca_dev, 0x78, data);
+}
+
 /* this function is called at probe and resume time for pac7302 */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
@@ -747,18 +797,15 @@
 	atomic_set(&sd->avg_lum, -1);

 	/* start stream */
-	reg_w(gspca_dev, 0xff, 0x01);
-	reg_w(gspca_dev, 0x78, 0x01);
+	set_streaming_led(gspca_dev, 1);

 	return gspca_dev->usb_err;
 }

 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
-
 	/* stop stream */
-	reg_w(gspca_dev, 0xff, 0x01);
-	reg_w(gspca_dev, 0x78, 0x00);
+	set_streaming_led(gspca_dev, 0);
 }

 /* called on streamoff with alt 0 and on disconnect for pac7302 */
@@ -766,8 +813,7 @@
 {
 	if (!gspca_dev->present)
 		return;
-	reg_w(gspca_dev, 0xff, 0x01);
-	reg_w(gspca_dev, 0x78, 0x40);
+	set_streaming_led(gspca_dev, 0);
 }

 /* Include pac common sof detection functions */
@@ -1121,6 +1167,44 @@
 	return 0;
 }

+static int sd_setled(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	sd->led = val;
+	set_streaming_led(gspca_dev, gspca_dev->streaming);
+	return gspca_dev->usb_err;
+}
+
+static int sd_getled(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	*val = sd->led;
+	return 0;
+}
+
+static int sd_querymenu(struct gspca_dev *gspca_dev,
+			struct v4l2_querymenu *menu)
+{
+	switch (menu->id) {
+	case V4L2_CID_LED:
+		switch (menu->index) {
+		case V4L2_LED_AUTO:
+			strcpy((char *)menu->name, "Auto");
+			return 0;
+		case V4L2_LED_OFF:
+			strcpy((char *)menu->name, "Off");
+			return 0;
+		case V4L2_LED_ON:
+			strcpy((char *)menu->name, "On");
+			return 0;
+		}
+		break;
+	}
+	return -EINVAL;
+}
+
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 static int sd_dbg_s_register(struct gspca_dev *gspca_dev,
 			struct v4l2_dbg_register *reg)
@@ -1210,6 +1294,7 @@
 	.stop0 = sd_stop0,
 	.pkt_scan = sd_pkt_scan,
 	.dq_callback = do_autogain,
+	.querymenu = sd_querymenu,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	.set_register = sd_dbg_s_register,
 	.get_chip_ident = sd_chip_ident,