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[4/6] em28xx-i2c: Fix error code for I2C error transfers

Message ID 1389013500-3110-5-git-send-email-m.chehab@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Mauro Carvalho Chehab Jan. 6, 2014, 1:04 p.m. UTC
Follow the error codes for I2C as described at Documentation/i2c/fault-codes.

In the case of the I2C status register (0x05), this is mapped into:

	- ETIMEDOUT - when reg 05 returns 0x10
	- ENXIO - when the device is not temporarily not responding
		  (e. g. reg 05 returning something not 0x10 or 0x00)
	- EIO - for generic I/O errors that don't fit into the above.

In the specific case of 0-byte reads, used only during I2C device
probing, it keeps returning -ENODEV.

TODO: return EBUSY when reg 05 returns 0x20 on em2874 and upper.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/media/usb/em28xx/em28xx-i2c.c | 41 +++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 19 deletions(-)
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Patch

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index 4e9915a24488..8d14be06f088 100644
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -80,7 +80,7 @@  static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 		if (ret == 0x80 + len - 1)
 			return len;
 		if (ret == 0x94 + len - 1) {
-			return -ENODEV;
+			return -ETIMEDOUT;
 		}
 		if (ret < 0) {
 			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
@@ -90,7 +90,7 @@  static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 		msleep(5);
 	}
 	em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
-	return -EIO;
+	return -ETIMEDOUT;
 }
 
 /*
@@ -123,7 +123,7 @@  static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
 		if (ret == 0x84 + len - 1)
 			break;
 		if (ret == 0x94 + len - 1) {
-			return -ENODEV;
+			return -ETIMEDOUT;
 		}
 		if (ret < 0) {
 			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
@@ -199,7 +199,7 @@  static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		if (ret == 0) /* success */
 			return len;
 		if (ret == 0x10) {
-			return -ENODEV;
+			return -ETIMEDOUT;
 		}
 		if (ret < 0) {
 			em28xx_warn("failed to get i2c transfer status from bridge register (error=%i)\n",
@@ -213,9 +213,8 @@  static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		 * (even with high payload) ...
 		 */
 	}
-
-	em28xx_warn("write to i2c device at 0x%x timed out\n", addr);
-	return -EIO;
+	em28xx_warn("write to i2c device at 0x%x timed out (status=%i)\n", addr, ret);
+	return -ENXIO;
 }
 
 /*
@@ -245,7 +244,7 @@  static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
 	 * bytes if we are on bus B AND there was no write attempt to the
 	 * specified slave address before AND no device is present at the
 	 * requested slave address.
-	 * Anyway, the next check will fail with -ENODEV in this case, so avoid
+	 * Anyway, the next check will fail with -ETIMEDOUT in this case, so avoid
 	 * spamming the system log on device probing and do nothing here.
 	 */
 
@@ -259,10 +258,10 @@  static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
 		return ret;
 	}
 	if (ret == 0x10)
-		return -ENODEV;
+		return -ETIMEDOUT;
 
 	em28xx_warn("unknown i2c error (status=%i)\n", ret);
-	return -EIO;
+	return -ENXIO;
 }
 
 /*
@@ -306,7 +305,7 @@  static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 		} else {
 			em28xx_warn("%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
 				    len, addr, ret);
-			return -EIO;
+			return -ENXIO;
 		}
 	}
 	/* Check success */
@@ -318,7 +317,7 @@  static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 	if (!ret)
 		return len;
 	else if (ret > 0)
-		return -ENODEV;
+		return -ETIMEDOUT;
 
 	return ret;
 	/*
@@ -356,7 +355,7 @@  static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 	 * bytes if we are on bus B AND there was no write attempt to the
 	 * specified slave address before AND no device is present at the
 	 * requested slave address.
-	 * Anyway, the next check will fail with -ENODEV in this case, so avoid
+	 * Anyway, the next check will fail with -ETIMEDOUT in this case, so avoid
 	 * spamming the system log on device probing and do nothing here.
 	 */
 
@@ -369,7 +368,7 @@  static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
 	if (!ret)
 		return len;
 	else if (ret > 0)
-		return -ENODEV;
+		return -ETIMEDOUT;
 
 	return ret;
 	/*
@@ -410,9 +409,9 @@  static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
 		rc = em2800_i2c_check_for_device(dev, addr);
 	else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
 		rc = em25xx_bus_B_check_for_device(dev, addr);
-	if (rc == -ENODEV) {
+	if (rc == -ETIMEDOUT) {
 		if (i2c_debug)
-			printk(" no device\n");
+			printk(" timeout\n");
 	}
 	return rc;
 }
@@ -498,11 +497,15 @@  static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
 			       (msgs[i].flags & I2C_M_RD) ? "read" : "write",
 			       i == num - 1 ? "stop" : "nonstop",
 			       addr, msgs[i].len);
-		if (!msgs[i].len) { /* no len: check only for device presence */
+		if (!msgs[i].len) {
+			/*
+			 * no len: check only for device presence
+			 * This code is only called during device probe.
+			 */
 			rc = i2c_check_for_device(i2c_bus, addr);
-			if (rc == -ENODEV) {
+			if (rc == -ETIMEDOUT) {
 				rt_mutex_unlock(&dev->i2c_bus_lock);
-				return rc;
+				return -ENODEV;
 			}
 		} else if (msgs[i].flags & I2C_M_RD) {
 			/* read bytes */