1 files changed, 177 insertions, 116 deletions

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index 1683bd9..8532c1d 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -50,15 +50,18 @@ do {							\
 } while (0)
 
 /*
- * em2800_i2c_send_max4()
- * send up to 4 bytes to the i2c device
+ * em2800_i2c_send_bytes()
+ * send up to 4 bytes to the em2800 i2c device
  */
-static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
-				char *buf, int len)
+static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 {
 	int ret;
 	int write_timeout;
-	unsigned char b2[6];
+	u8 b2[6];
+
+	if (len < 1 || len > 4)
+		return -EOPNOTSUPP;
+
 	BUG_ON(len < 1 || len > 4);
 	b2[5] = 0x80 + len - 1;
 	b2[4] = addr;
@@ -70,165 +73,212 @@ static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
 	if (len > 3)
 		b2[0] = buf[3];
 
+	/* trigger write */
 	ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
 	if (ret != 2 + len) {
-		em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
-		return -EIO;
+		em28xx_warn("failed to trigger write to i2c address 0x%x "
+			    "(error=%i)\n", addr, ret);
+		return (ret < 0) ? ret : -EIO;
 	}
-	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
+	/* wait for completion */
+	for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
 	     write_timeout -= 5) {
 		ret = dev->em28xx_read_reg(dev, 0x05);
-		if (ret == 0x80 + len - 1)
+		if (ret == 0x80 + len - 1) {
 			return len;
+		} else if (ret == 0x94 + len - 1) {
+			return -ENODEV;
+		} else if (ret < 0) {
+			em28xx_warn("failed to get i2c transfer status from "
+				    "bridge register (error=%i)\n", ret);
+			return ret;
+		}
 		msleep(5);
 	}
-	em28xx_warn("i2c write timed out\n");
+	em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
 	return -EIO;
 }
 
 /*
- * em2800_i2c_send_bytes()
- */
-static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf,
-				 short len)
-{
-	char *bufPtr = buf;
-	int ret;
-	int wrcount = 0;
-	int count;
-	int maxLen = 4;
-	struct em28xx *dev = (struct em28xx *)data;
-	while (len > 0) {
-		count = (len > maxLen) ? maxLen : len;
-		ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
-		if (ret > 0) {
-			len -= count;
-			bufPtr += count;
-			wrcount += count;
-		} else
-			return (ret < 0) ? ret : -EFAULT;
-	}
-	return wrcount;
-}
-
-/*
- * em2800_i2c_check_for_device()
- * check if there is a i2c_device at the supplied address
+ * em2800_i2c_recv_bytes()
+ * read up to 4 bytes from the em2800 i2c device
  */
-static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
+static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 {
-	char msg;
+	u8 buf2[4];
 	int ret;
-	int write_timeout;
-	msg = addr;
-	ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
-	if (ret < 0) {
-		em28xx_warn("setting i2c device address failed (error=%i)\n",
-			    ret);
-		return ret;
-	}
-	msg = 0x84;
-	ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
-	if (ret < 0) {
-		em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
-		return ret;
+	int read_timeout;
+	int i;
+
+	if (len < 1 || len > 4)
+		return -EOPNOTSUPP;
+
+	/* trigger read */
+	buf2[1] = 0x84 + len - 1;
+	buf2[0] = addr;
+	ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
+	if (ret != 2) {
+		em28xx_warn("failed to trigger read from i2c address 0x%x "
+			    "(error=%i)\n", addr, ret);
+		return (ret < 0) ? ret : -EIO;
 	}
-	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
-	     write_timeout -= 5) {
-		unsigned reg = dev->em28xx_read_reg(dev, 0x5);
 
-		if (reg == 0x94)
+	/* wait for completion */
+	for (read_timeout = EM2800_I2C_XFER_TIMEOUT; read_timeout > 0;
+	     read_timeout -= 5) {
+		ret = dev->em28xx_read_reg(dev, 0x05);
+		if (ret == 0x84 + len - 1) {
+			break;
+		} else if (ret == 0x94 + len - 1) {
 			return -ENODEV;
-		else if (reg == 0x84)
-			return 0;
+		} else if (ret < 0) {
+			em28xx_warn("failed to get i2c transfer status from "
+				    "bridge register (error=%i)\n", ret);
+			return ret;
+		}
 		msleep(5);
 	}
-	return -ENODEV;
+	if (ret != 0x84 + len - 1)
+		em28xx_warn("read from i2c device at 0x%x timed out\n", addr);
+
+	/* get the received message */
+	ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4-len, buf2, len);
+	if (ret != len) {
+		em28xx_warn("reading from i2c device at 0x%x failed: "
+			    "couldn't get the received message from the bridge "
+			    "(error=%i)\n", addr, ret);
+		return (ret < 0) ? ret : -EIO;
+	}
+	for (i = 0; i < len; i++)
+		buf[i] = buf2[len - 1 - i];
+
+	return ret;
 }
 
 /*
- * em2800_i2c_recv_bytes()
- * read from the i2c device
+ * em2800_i2c_check_for_device()
+ * check if there is an i2c device at the supplied address
  */
-static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
-				 char *buf, int len)
+static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
 {
+	u8 buf;
 	int ret;
-	/* check for the device and set i2c read address */
-	ret = em2800_i2c_check_for_device(dev, addr);
-	if (ret) {
-		em28xx_warn
-		    ("preparing read at i2c address 0x%x failed (error=%i)\n",
-		     addr, ret);
-		return ret;
-	}
-	ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
-	if (ret < 0) {
-		em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
-			    addr, ret);
-		return ret;
-	}
-	return ret;
+
+	ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
+	if (ret == 1)
+		return 0;
+	return (ret < 0) ? ret : -EIO;
 }
 
 /*
  * em28xx_i2c_send_bytes()
  */
-static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf,
-				 short len, int stop)
+static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
+				 u16 len, int stop)
 {
-	int wrcount = 0;
-	struct em28xx *dev = (struct em28xx *)data;
 	int write_timeout, ret;
 
-	wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
+	if (len < 1 || len > 64)
+		return -EOPNOTSUPP;
+	/* NOTE: limited by the USB ctrl message constraints
+	 * Zero length reads always succeed, even if no device is connected */
+
+	/* Write to i2c device */
+	ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
+	if (ret != len) {
+		if (ret < 0) {
+			em28xx_warn("writing to i2c device at 0x%x failed "
+				    "(error=%i)\n", addr, ret);
+			return ret;
+		} else {
+			em28xx_warn("%i bytes write to i2c device at 0x%x "
+				    "requested, but %i bytes written\n",
+				    len, addr, ret);
+			return -EIO;
+		}
+	}
 
-	/* Seems to be required after a write */
-	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
+	/* Check success of the i2c operation */
+	for (write_timeout = EM2800_I2C_XFER_TIMEOUT; write_timeout > 0;
 	     write_timeout -= 5) {
 		ret = dev->em28xx_read_reg(dev, 0x05);
-		if (!ret)
-			break;
+		if (ret == 0) { /* success */
+			return len;
+		} else if (ret == 0x10) {
+			return -ENODEV;
+		} else if (ret < 0) {
+			em28xx_warn("failed to read i2c transfer status from "
+				    "bridge (error=%i)\n", ret);
+			return ret;
+		}
 		msleep(5);
+		/* NOTE: do we really have to wait for success ?
+		   Never seen anything else than 0x00 or 0x10
+		   (even with high payload) ...			*/
 	}
-
-	return wrcount;
+	em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
+	return -EIO;
 }
 
 /*
  * em28xx_i2c_recv_bytes()
  * read a byte from the i2c device
  */
-static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
-				 char *buf, int len)
+static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
 {
 	int ret;
+
+	if (len < 1 || len > 64)
+		return -EOPNOTSUPP;
+	/* NOTE: limited by the USB ctrl message constraints
+	 * Zero length reads always succeed, even if no device is connected */
+
+	/* Read data from i2c device */
 	ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
+	if (ret != len) {
+		if (ret < 0) {
+			em28xx_warn("reading from i2c device at 0x%x failed "
+				    "(error=%i)\n", addr, ret);
+			return ret;
+		} else {
+			em28xx_warn("%i bytes requested from i2c device at "
+				    "0x%x, but %i bytes received\n",
+				    len, addr, ret);
+			return -EIO;
+		}
+	}
+
+	/* Check success of the i2c operation */
+	ret = dev->em28xx_read_reg(dev, 0x05);
 	if (ret < 0) {
-		em28xx_warn("reading i2c device failed (error=%i)\n", ret);
+		em28xx_warn("failed to read i2c transfer status from "
+			    "bridge (error=%i)\n", ret);
 		return ret;
 	}
-	if (dev->em28xx_read_reg(dev, 0x5) != 0)
-		return -ENODEV;
-	return ret;
+	if (ret > 0) {
+		if (ret == 0x10) {
+			return -ENODEV;
+		} else {
+			em28xx_warn("unknown i2c error (status=%i)\n", ret);
+			return -EIO;
+		}
+	}
+	return len;
 }
 
 /*
  * em28xx_i2c_check_for_device()
  * check if there is a i2c_device at the supplied address
  */
-static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
+static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
 {
 	int ret;
+	u8 buf;
 
-	ret = dev->em28xx_read_reg_req(dev, 2, addr);
-	if (ret < 0) {
-		em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
-		return ret;
-	}
-	if (dev->em28xx_read_reg(dev, 0x5) != 0)
-		return -ENODEV;
-	return 0;
+	ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
+	if (ret == 1)
+		return 0;
+	return (ret < 0) ? ret : -EIO;
 }
 
 /*
@@ -253,11 +303,11 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
 				rc = em2800_i2c_check_for_device(dev, addr);
 			else
 				rc = em28xx_i2c_check_for_device(dev, addr);
-			if (rc < 0) {
-				dprintk2(2, " no device\n");
+			if (rc == -ENODEV) {
+				if (i2c_debug >= 2)
+					printk(" no device\n");
 				return rc;
 			}
-
 		} else if (msgs[i].flags & I2C_M_RD) {
 			/* read bytes */
 			if (dev->board.is_em2800)
@@ -288,16 +338,16 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
 							   msgs[i].len,
 							   i == num - 1);
 		}
-		if (rc < 0)
-			goto err;
+		if (rc < 0) {
+			if (i2c_debug >= 2)
+				printk(" ERROR: %i\n", rc);
+			return rc;
+		}
 		if (i2c_debug >= 2)
 			printk("\n");
 	}
 
 	return num;
-err:
-	dprintk2(2, " ERROR: %i\n", rc);
-	return rc;
 }
 
 /* based on linux/sunrpc/svcauth.h and linux/hash.h
@@ -329,7 +379,7 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 {
 	unsigned char buf, *p = eedata;
 	struct em28xx_eeprom *em_eeprom = (void *)eedata;
-	int i, err, size = len, block;
+	int i, err, size = len, block, block_max;
 
 	if (dev->chip_id == CHIP_ID_EM2874 ||
 	    dev->chip_id == CHIP_ID_EM28174 ||
@@ -362,9 +412,15 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 		       dev->name, err);
 		return err;
 	}
+
+	if (dev->board.is_em2800)
+		block_max = 4;
+	else
+		block_max = 64;
+
 	while (size > 0) {
-		if (size > 16)
-			block = 16;
+		if (size > block_max)
+			block = block_max;
 		else
 			block = size;
 
@@ -449,7 +505,11 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
  */
 static u32 functionality(struct i2c_adapter *adap)
 {
-	return I2C_FUNC_SMBUS_EMUL;
+	struct em28xx *dev = adap->algo_data;
+	u32 func_flags = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+	if (dev->board.is_em2800)
+		func_flags &= ~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
+	return func_flags;
 }
 
 static struct i2c_algorithm em28xx_algo = {
@@ -474,6 +534,7 @@ static struct i2c_client em28xx_client_template = {
  * incomplete list of known devices
  */
 static char *i2c_devs[128] = {
+	[0x3e >> 1] = "remote IR sensor",
 	[0x4a >> 1] = "saa7113h",
 	[0x52 >> 1] = "drxk",
 	[0x60 >> 1] = "remote IR sensor",