V4L/DVB (8123): Add support for em2860 based PointNix Intra-Oral Camera

em28xx-cards.c
em28xx-input.c
em28xx-video.c
em28xx.h
 - Add support for the PointNix Intra-Oral Camera, which required addition of
   a construct for reading the "snapshot" button (provided on the em2860 and
   em2880 chips, but this is the first case where I have seen it actually used
   in a product). The button is wired to pin 56 on the em2880.

   http://www.pointnix.com/ENG/dental/product_02.asp

   Thanks to Roberto Mantovani <rmantovani@libero.it> for testing the changes

Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

Documentation/video4linux/CARDLIST.em28xx

@@ -17,3 +17,4 @@
  16 -> Hauppauge WinTV HVR 950                  (em2880)        [2040:6513,2040:6517,2040:651b,2040:651f]
  17 -> Pinnacle PCTV HD Pro Stick               (em2880)        [2304:0227]
  18 -> Hauppauge WinTV HVR 900 (R2)             (em2880)        [2040:6502]
+ 19 -> PointNix Intra-Oral Camera               (em2860)

drivers/media/video/em28xx/em28xx-cards.c

@@ -426,6 +426,19 @@ struct em28xx_board em28xx_boards[] = {
 			.amux     = EM28XX_AMUX_LINE_IN,
 		} },
 	},
+	[EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA] = {
+		.name         = "PointNix Intra-Oral Camera",
+		.has_snapshot_button = 1,
+		.vchannels    = 1,
+		.tda9887_conf = TDA9887_PRESENT,
+		.tuner_type   = TUNER_ABSENT,
+		.decoder      = EM28XX_SAA7113,
+		.input          = { {
+			.type     = EM28XX_VMUX_SVIDEO,
+			.vmux     = SAA7115_SVIDEO3,
+			.amux     = 0,
+		} },
+	},
 };
 const unsigned int em28xx_bcount = ARRAY_SIZE(em28xx_boards);
 
@@ -522,6 +535,7 @@ static struct em28xx_hash_table em28xx_eeprom_hash [] = {
 static struct em28xx_hash_table em28xx_i2c_hash[] = {
 	{0xb06a32c3, EM2800_BOARD_TERRATEC_CINERGY_200, TUNER_LG_PAL_NEW_TAPC},
 	{0xf51200e3, EM2800_BOARD_VGEAR_POCKETTV, TUNER_LG_PAL_NEW_TAPC},
+	{0x1ba50080, EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA, TUNER_ABSENT},
 };
 
 int em28xx_tuner_callback(void *ptr, int command, int arg)
@@ -554,6 +568,7 @@ static void em28xx_set_model(struct em28xx *dev)
 	dev->has_12mhz_i2s = em28xx_boards[dev->model].has_12mhz_i2s;
 	dev->max_range_640_480 = em28xx_boards[dev->model].max_range_640_480;
 	dev->has_dvb = em28xx_boards[dev->model].has_dvb;
+	dev->has_snapshot_button = em28xx_boards[dev->model].has_snapshot_button;
 }
 
 /* Since em28xx_pre_card_setup() requires a proper dev->model,
@@ -841,6 +856,9 @@ void em28xx_card_setup(struct em28xx *dev)
 			em28xx_set_model(dev);
 	}
 
+	if (dev->has_snapshot_button)
+		em28xx_register_snapshot_button(dev);
+
 	/* Allow override tuner type by a module parameter */
 	if (tuner >= 0)
 		dev->tuner_type = tuner;

drivers/media/video/em28xx/em28xx-input.c

@@ -30,6 +30,10 @@
 
 #include "em28xx.h"
 
+#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
+#define EM28XX_SBUTTON_QUERY_INTERVAL 500
+#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
+
 static unsigned int ir_debug;
 module_param(ir_debug, int, 0644);
 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
@@ -124,6 +128,89 @@ int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 	return 1;
 }
 
+static void em28xx_query_sbutton(struct work_struct *work)
+{
+	/* Poll the register and see if the button is depressed */
+	struct em28xx *dev =
+		container_of(work, struct em28xx, sbutton_query_work.work);
+	int ret;
+
+	ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
+
+	if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
+		u8 cleared;
+		/* Button is depressed, clear the register */
+		cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
+		em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
+
+		/* Not emulate the keypress */
+		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
+				 1);
+		/* Now unpress the key */
+		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
+				 0);
+	}
+
+	/* Schedule next poll */
+	schedule_delayed_work(&dev->sbutton_query_work,
+			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
+}
+
+void em28xx_register_snapshot_button(struct em28xx *dev)
+{
+	struct input_dev *input_dev;
+	int err;
+
+	em28xx_info("Registering snapshot button...\n");
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		em28xx_errdev("input_allocate_device failed\n");
+		return;
+	}
+
+	usb_make_path(dev->udev, dev->snapshot_button_path,
+		      sizeof(dev->snapshot_button_path));
+	strlcat(dev->snapshot_button_path, "/sbutton",
+		sizeof(dev->snapshot_button_path));
+	INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
+
+	input_dev->name = "em28xx snapshot button";
+	input_dev->phys = dev->snapshot_button_path;
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
+	input_dev->keycodesize = 0;
+	input_dev->keycodemax = 0;
+	input_dev->id.bustype = BUS_USB;
+	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
+	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
+	input_dev->id.version = 1;
+	input_dev->dev.parent = &dev->udev->dev;
+
+	err = input_register_device(input_dev);
+	if (err) {
+		em28xx_errdev("input_register_device failed\n");
+		input_free_device(input_dev);
+		return;
+	}
+
+	dev->sbutton_input_dev = input_dev;
+	schedule_delayed_work(&dev->sbutton_query_work,
+			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
+	return;
+
+}
+
+void em28xx_deregister_snapshot_button(struct em28xx *dev)
+{
+	if (dev->sbutton_input_dev != NULL) {
+		em28xx_info("Deregistering snapshot button\n");
+		cancel_rearming_delayed_work(&dev->sbutton_query_work);
+		input_unregister_device(dev->sbutton_input_dev);
+		dev->sbutton_input_dev = NULL;
+	}
+	return;
+}
+
 /* ----------------------------------------------------------------------
  * Local variables:
  * c-basic-offset: 8

drivers/media/video/em28xx/em28xx-video.c

@@ -1590,6 +1590,8 @@ static void em28xx_release_resources(struct em28xx *dev)
 				dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
 				dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
 	list_del(&dev->devlist);
+	if (dev->sbutton_input_dev)
+		em28xx_deregister_snapshot_button(dev);
 	if (dev->radio_dev) {
 		if (-1 != dev->radio_dev->minor)
 			video_unregister_device(dev->radio_dev);

drivers/media/video/em28xx/em28xx.h

@@ -57,6 +57,7 @@
 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950	16
 #define EM2880_BOARD_PINNACLE_PCTV_HD_PRO	17
 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2	18
+#define EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA  19
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4
@@ -249,6 +250,7 @@ struct em28xx_board {
 	unsigned int has_12mhz_i2s:1;
 	unsigned int max_range_640_480:1;
 	unsigned int has_dvb:1;
+	unsigned int has_snapshot_button:1;
 
 	enum em28xx_decoder decoder;
 
@@ -328,6 +330,7 @@ struct em28xx {
 	unsigned int has_12mhz_i2s:1;
 	unsigned int max_range_640_480:1;
 	unsigned int has_dvb:1;
+	unsigned int has_snapshot_button:1;
 
 	/* Some older em28xx chips needs a waiting time after writing */
 	unsigned int wait_after_write;
@@ -418,6 +421,11 @@ struct em28xx {
 	/* Caches GPO and GPIO registers */
 	unsigned char	reg_gpo, reg_gpio;
 
+	/* Snapshot button */
+	char snapshot_button_path[30];	/* path of the input dev */
+	struct input_dev *sbutton_input_dev;
+	struct delayed_work sbutton_query_work;
+
 	struct em28xx_dvb *dvb;
 };
 
@@ -483,6 +491,8 @@ int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 				     u32 *ir_raw);
+void em28xx_register_snapshot_button(struct em28xx *dev);
+void em28xx_deregister_snapshot_button(struct em28xx *dev);
 
 /* printk macros */