V4L/DVB (6545): em28xx: autodetect Cinergy 200 USB and VGear PocketTV

Adds autodetection support for the Cinergy200 USB and the VGear PocketTV.

Whenever a usb device with generic empia em2800 usb ids is detected the device
gets scanned for connected i2c devices. If the device list matches an em2800
device in the device list the model id gets changed accordingly.

Signed-off-by: Sascha Sommer <saschasommer@freenet.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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

@@ -402,6 +402,11 @@ static struct em28xx_hash_table em28xx_hash [] = {
 	{ 0x6ce05a8f, EM2820_BOARD_PROLINK_PLAYTV_USB2, TUNER_YMEC_TVF_5533MF },
 };
 
+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 },
+};
+
 /* Since em28xx_pre_card_setup() requires a proper dev->model,
  * this won't work for boards with generic PCI IDs
  */
@@ -498,13 +503,38 @@ static int em28xx_hint_board(struct em28xx *dev)
 			return 0;
 		}
 	}
+
+	/* user did not request i2c scanning => do it now */
+	if (!dev->i2c_hash)
+		em28xx_do_i2c_scan(dev);
+
+	for (i = 0; i < ARRAY_SIZE(em28xx_i2c_hash); i++) {
+		if (dev->i2c_hash == em28xx_i2c_hash[i].hash) {
+			dev->model = em28xx_i2c_hash[i].model;
+			dev->tuner_type = em28xx_i2c_hash[i].tuner;
+			em28xx_errdev("Your board has no unique USB ID.\n");
+			em28xx_errdev("A hint were successfully done, "
+				      "based on i2c devicelist hash.\n");
+			em28xx_errdev("This method is not 100%% failproof.\n");
+			em28xx_errdev("If the board were missdetected, "
+				      "please email this log to:\n");
+			em28xx_errdev("\tV4L Mailing List "
+				      " <video4linux-list@redhat.com>\n");
+			em28xx_errdev("Board detected as %s\n",
+				      em28xx_boards[dev->model].name);
+
+			return 0;
+		}
+	}
+
 	em28xx_errdev("Your board has no unique USB ID and thus need a "
 		      "hint to be detected.\n");
 	em28xx_errdev("You may try to use card=<n> insmod option to "
 		      "workaround that.\n");
 	em28xx_errdev("Please send an email with this log to:\n");
 	em28xx_errdev("\tV4L Mailing List <video4linux-list@redhat.com>\n");
 	em28xx_errdev("Board eeprom hash is 0x%08lx\n", dev->hash);
+	em28xx_errdev("Board i2c devicelist hash is 0x%08lx\n", dev->i2c_hash);
 
 	em28xx_errdev("Here is a list of valid choices for the card=<n>"
 		      " insmod option:\n");

drivers/media/video/em28xx/em28xx-i2c.c

@@ -533,19 +533,26 @@ static char *i2c_devs[128] = {
  * do_i2c_scan()
  * check i2c address range for devices
  */
-static void do_i2c_scan(char *name, struct i2c_client *c)
+void em28xx_do_i2c_scan(struct em28xx *dev)
 {
+	u8 i2c_devicelist[128];
 	unsigned char buf;
 	int i, rc;
 
+	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
+
 	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
-		c->addr = i;
-		rc = i2c_master_recv(c, &buf, 0);
+		dev->i2c_client.addr = i;
+		rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
 		if (rc < 0)
 			continue;
-		printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", name,
-		       i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+		i2c_devicelist[i] = i;
+		printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
+		       dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
 	}
+
+	dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
+					ARRAY_SIZE(i2c_devicelist), 32);
 }
 
 /*
@@ -578,7 +585,7 @@ int em28xx_i2c_register(struct em28xx *dev)
 	em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
 
 	if (i2c_scan)
-		do_i2c_scan(dev->name, &dev->i2c_client);
+		em28xx_do_i2c_scan(dev);
 	return 0;
 }
 

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

@@ -1510,6 +1510,7 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
 	dev->em28xx_write_regs_req = em28xx_write_regs_req;
 	dev->em28xx_read_reg_req = em28xx_read_reg_req;
+	dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
 
 	/* setup video picture settings for saa7113h */
 	memset(&dev->vpic, 0, sizeof(dev->vpic));

drivers/media/video/em28xx/em28xx.h

@@ -260,6 +260,7 @@ struct em28xx {
 	int type;
 
 	unsigned long hash;	/* eeprom hash - for boards with generic ID */
+	unsigned long i2c_hash;	/* i2c devicelist hash - for boards with generic ID */
 
 	/* states */
 	enum em28xx_dev_state state;
@@ -296,6 +297,7 @@ struct em28xx {
 /* Provided by em28xx-i2c.c */
 
 void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg);
+void em28xx_do_i2c_scan(struct em28xx *dev);
 int em28xx_i2c_register(struct em28xx *dev);
 int em28xx_i2c_unregister(struct em28xx *dev);