V4L/DVB (10632): Added support for AVerMedia Cardbus Hybrid remote control

Added support for I2C device at address 0x40 and subaddress 0x0d/0x0b
that provides remote control key reading support for AVerMedia Cardbus
Hybrid card, possibly for other AVerMedia Cardbus cards.

The I2C address 0x40 doesn't like the SAA7134's 0xfd quirk, so it was
disabled.

[mchehab@redhat.com: CodingStyle fixes]
Signed-off-by: Oldřich Jedlička <oldium.pro@seznam.cz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/media/video/ir-kbd-i2c.c b/drivers/media/video/ir-kbd-i2c.c
index d4658c56edd..2ee49b7ddcf 100644
--- a/drivers/media/video/ir-kbd-i2c.c
+++ b/drivers/media/video/ir-kbd-i2c.c
@@ -16,6 +16,8 @@
  *      Henry Wong <henry@stuffedcow.net>
  *      Mark Schultz <n9xmj@yahoo.com>
  *      Brian Rogers <brian_rogers@comcast.net>
+ * modified for AVerMedia Cardbus by
+ *      Oldrich Jedlicka <oldium.pro@seznam.cz>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -216,6 +218,46 @@ static int get_key_knc1(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 	return 1;
 }
 
+static int get_key_avermedia_cardbus(struct IR_i2c *ir,
+				     u32 *ir_key, u32 *ir_raw)
+{
+	unsigned char subaddr, key, keygroup;
+	struct i2c_msg msg[] = { { .addr = ir->c.addr, .flags = 0,
+				   .buf = &subaddr, .len = 1},
+				 { .addr = ir->c.addr, .flags = I2C_M_RD,
+				  .buf = &key, .len = 1} };
+	subaddr = 0x0d;
+	if (2 != i2c_transfer(ir->c.adapter, msg, 2)) {
+		dprintk(1, "read error\n");
+		return -EIO;
+	}
+
+	if (key == 0xff)
+		return 0;
+
+	subaddr = 0x0b;
+	msg[1].buf = &keygroup;
+	if (2 != i2c_transfer(ir->c.adapter, msg, 2)) {
+		dprintk(1, "read error\n");
+		return -EIO;
+	}
+
+	if (keygroup == 0xff)
+		return 0;
+
+	dprintk(1, "read key 0x%02x/0x%02x\n", key, keygroup);
+	if (keygroup < 2 || keygroup > 3) {
+		/* Only a warning */
+		dprintk(1, "warning: invalid key group 0x%02x for key 0x%02x\n",
+								keygroup, key);
+	}
+	key |= (keygroup & 1) << 6;
+
+	*ir_key = key;
+	*ir_raw = key;
+	return 1;
+}
+
 /* ----------------------------------------------------------------------- */
 
 static void ir_key_poll(struct IR_i2c *ir)
@@ -360,6 +402,12 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
 			ir_type     = IR_TYPE_OTHER;
 		}
 		break;
+	case 0x40:
+		name        = "AVerMedia Cardbus remote";
+		ir->get_key = get_key_avermedia_cardbus;
+		ir_type     = IR_TYPE_OTHER;
+		ir_codes    = ir_codes_avermedia_cardbus;
+		break;
 	default:
 		/* shouldn't happen */
 		printk(DEVNAME ": Huh? unknown i2c address (0x%02x)?\n", addr);
@@ -524,6 +572,22 @@ static int ir_probe(struct i2c_adapter *adap)
 			ir_attach(adap, msg.addr, 0, 0);
 	}
 
+	/* Special case for AVerMedia Cardbus remote */
+	if (adap->id == I2C_HW_SAA7134) {
+		unsigned char subaddr, data;
+		struct i2c_msg msg[] = { { .addr = 0x40, .flags = 0,
+					   .buf = &subaddr, .len = 1},
+					 { .addr = 0x40, .flags = I2C_M_RD,
+					   .buf = &data, .len = 1} };
+		subaddr = 0x0d;
+		rc = i2c_transfer(adap, msg, 2);
+		dprintk(1, "probe 0x%02x/0x%02x @ %s: %s\n",
+			msg[0].addr, subaddr, adap->name,
+			(2 == rc) ? "yes" : "no");
+		if (2 == rc)
+			ir_attach(adap, msg[0].addr, 0, 0);
+	}
+
 	return 0;
 }