From 6aff3115b90780933d390d2b471479179927468d Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Tue, 17 Dec 2002 01:51:00 +0000
Subject: * Use 1-byte-read instead of -write for iprobe() function   Add i2c
 commands to PM826 config

* extend I2C POST code: check for list on known addresses
---
 post/i2c.c | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

(limited to 'post')

diff --git a/post/i2c.c b/post/i2c.c
index 2e38986..1b2e644 100644
--- a/post/i2c.c
+++ b/post/i2c.c
@@ -29,8 +29,13 @@
  * I2C test
  *
  * For verifying the I2C bus, a full I2C bus scanning is performed.
- * If any I2C device is found, the test is considered as passed,
- * otherwise failed.
+ *
+ * #ifdef I2C_ADDR_LIST
+ *   The test is considered as passed if all the devices and
+ *   only the devices in the list are found.
+ * #else [ ! I2C_ADDR_LIST ]
+ *   The test is considered as passed if any I2C device is found.
+ * #endif
  */
 
 #include <post.h>
@@ -41,14 +46,48 @@
 int i2c_post_test (int flags)
 {
 	unsigned int i;
-	unsigned int chips = 0;
+	unsigned int good = 0;
+#ifdef I2C_ADDR_LIST
+	unsigned int bad  = 0;
+	int j;
+	unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
+	unsigned char i2c_miss_list[] = I2C_ADDR_LIST;
+#endif
 
 	for (i = 0; i < 128; i++) {
-		if (i2c_probe (i) == 0)
-			chips++;
+		if (i2c_probe (i) == 0) {
+#ifndef	I2C_ADDR_LIST
+			good++;
+#else	/* I2C_ADDR_LIST */
+			for (j=0; j<sizeof(i2c_addr_list); ++j) {
+				if (i == i2c_addr_list[j]) {
+					good++;
+					i2c_miss_list[j] = 0xFF;
+					break;
+				}
+			}
+			if (j == sizeof(i2c_addr_list)) {
+				bad++;
+				post_log ("I2C: addr %02X not expected\n",
+						i);
+			}
+#endif	/* I2C_ADDR_LIST */
+		}
 	}
 
-	return chips > 0 ? 0 : -1;
+#ifndef	I2C_ADDR_LIST
+	return good > 0 ? 0 : -1;
+#else	/* I2C_ADDR_LIST */
+	if (good != sizeof(i2c_addr_list)) {
+		for (j=0; j<sizeof(i2c_miss_list); ++j) {
+			if (i2c_miss_list[j] != 0xFF) {
+				post_log ("I2C: addr %02X did not respond\n",
+						i2c_miss_list[j]);
+			}
+		}
+	}
+	return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1;
+#endif
 }
 
 #endif /* CONFIG_POST & CFG_POST_I2C */
-- 
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