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authorJean Delvare <khali@linux-fr.org>2008-10-17 19:51:13 +0400
committerJean Delvare <khali@mahadeva.delvare>2008-10-17 19:51:13 +0400
commit69fc1feba2d5856ff74dedb6ae9d8c490210825c (patch)
tree11fd5e34315dd86ca23fbf2eb18af24f4794032f /drivers/hwmon/lm85.c
parentdbee356262bb1c84cfa585530e33e7003534052a (diff)
downloadlinux-69fc1feba2d5856ff74dedb6ae9d8c490210825c.tar.xz
hwmon: (lm85) Rework the device detection
Rework the device detection to make it clearer and faster in the general case (when a known device is found.) Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Herbert Poetzl <herbert@13thfloor.at>
Diffstat (limited to 'drivers/hwmon/lm85.c')
-rw-r--r--drivers/hwmon/lm85.c123
1 files changed, 50 insertions, 73 deletions
diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 12d446f54f97..3594a02f281b 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -1106,7 +1106,6 @@ static void lm85_init_client(struct i2c_client *client)
static int lm85_detect(struct i2c_adapter *adapter, int address,
int kind)
{
- int company, verstep;
struct i2c_client *client;
struct lm85_data *data;
int err = 0;
@@ -1117,10 +1116,6 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
goto ERROR0;
}
- /* OK. For now, we presume we have a valid client. We now create the
- client structure, even though we cannot fill it completely yet.
- But it allows us to access lm85_{read,write}_value. */
-
if (!(data = kzalloc(sizeof(struct lm85_data), GFP_KERNEL))) {
err = -ENOMEM;
goto ERROR0;
@@ -1132,75 +1127,57 @@ static int lm85_detect(struct i2c_adapter *adapter, int address,
client->adapter = adapter;
client->driver = &lm85_driver;
- /* Now, we do the remaining detection. */
-
- company = lm85_read_value(client, LM85_REG_COMPANY);
- verstep = lm85_read_value(client, LM85_REG_VERSTEP);
-
- dev_dbg(&adapter->dev, "Detecting device at %d,0x%02x with"
- " COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
- i2c_adapter_id(client->adapter), client->addr,
- company, verstep);
-
- /* If auto-detecting, Determine the chip type. */
- if (kind <= 0) {
- dev_dbg(&adapter->dev, "Autodetecting device at %d,0x%02x ...\n",
- i2c_adapter_id(adapter), address);
- if (company == LM85_COMPANY_NATIONAL
- && verstep == LM85_VERSTEP_LM85C) {
- kind = lm85c;
- } else if (company == LM85_COMPANY_NATIONAL
- && verstep == LM85_VERSTEP_LM85B) {
- kind = lm85b;
- } else if (company == LM85_COMPANY_NATIONAL
- && (verstep & LM85_VERSTEP_VMASK) == LM85_VERSTEP_GENERIC) {
- dev_err(&adapter->dev, "Unrecognized version/stepping 0x%02x"
- " Defaulting to LM85.\n", verstep);
- kind = any_chip;
- } else if (company == LM85_COMPANY_ANALOG_DEV
- && verstep == LM85_VERSTEP_ADM1027) {
- kind = adm1027;
- } else if (company == LM85_COMPANY_ANALOG_DEV
- && (verstep == LM85_VERSTEP_ADT7463
- || verstep == LM85_VERSTEP_ADT7463C)) {
- kind = adt7463;
- } else if (company == LM85_COMPANY_ANALOG_DEV
- && (verstep & LM85_VERSTEP_VMASK) == LM85_VERSTEP_GENERIC) {
- dev_err(&adapter->dev, "Unrecognized version/stepping 0x%02x"
- " Defaulting to Generic LM85.\n", verstep);
- kind = any_chip;
- } else if (company == LM85_COMPANY_SMSC
- && (verstep == LM85_VERSTEP_EMC6D100_A0
- || verstep == LM85_VERSTEP_EMC6D100_A1)) {
- /* Unfortunately, we can't tell a '100 from a '101
- * from the registers. Since a '101 is a '100
- * in a package with fewer pins and therefore no
- * 3.3V, 1.5V or 1.8V inputs, perhaps if those
- * inputs read 0, then it's a '101.
- */
- kind = emc6d100;
- } else if (company == LM85_COMPANY_SMSC
- && verstep == LM85_VERSTEP_EMC6D102) {
- kind = emc6d102;
- } else if (company == LM85_COMPANY_SMSC
- && (verstep & LM85_VERSTEP_VMASK) == LM85_VERSTEP_GENERIC) {
- dev_err(&adapter->dev, "lm85: Detected SMSC chip\n");
- dev_err(&adapter->dev, "lm85: Unrecognized version/stepping 0x%02x"
- " Defaulting to Generic LM85.\n", verstep);
- kind = any_chip;
- } else if (kind == any_chip
- && (verstep & LM85_VERSTEP_VMASK) == LM85_VERSTEP_GENERIC) {
- dev_err(&adapter->dev, "Generic LM85 Version 6 detected\n");
- /* Leave kind as "any_chip" */
- } else {
- dev_dbg(&adapter->dev, "Autodetection failed\n");
- /* Not an LM85... */
- if (kind == any_chip) { /* User used force=x,y */
- dev_err(&adapter->dev, "Generic LM85 Version 6 not"
- " found at %d,0x%02x. Try force_lm85c.\n",
- i2c_adapter_id(adapter), address);
+ /* If auto-detecting, determine the chip type */
+ if (kind < 0) {
+ int company = lm85_read_value(client, LM85_REG_COMPANY);
+ int verstep = lm85_read_value(client, LM85_REG_VERSTEP);
+
+ dev_dbg(&adapter->dev, "Detecting device at 0x%02x with "
+ "COMPANY: 0x%02x and VERSTEP: 0x%02x\n",
+ address, company, verstep);
+
+ /* All supported chips have the version in common */
+ if ((verstep & LM85_VERSTEP_VMASK) != LM85_VERSTEP_GENERIC) {
+ dev_dbg(&adapter->dev, "Autodetection failed: "
+ "unsupported version\n");
+ goto ERROR1;
+ }
+ kind = any_chip;
+
+ /* Now, refine the detection */
+ if (company == LM85_COMPANY_NATIONAL) {
+ switch (verstep) {
+ case LM85_VERSTEP_LM85C:
+ kind = lm85c;
+ break;
+ case LM85_VERSTEP_LM85B:
+ kind = lm85b;
+ break;
+ }
+ } else if (company == LM85_COMPANY_ANALOG_DEV) {
+ switch (verstep) {
+ case LM85_VERSTEP_ADM1027:
+ kind = adm1027;
+ break;
+ case LM85_VERSTEP_ADT7463:
+ case LM85_VERSTEP_ADT7463C:
+ kind = adt7463;
+ break;
}
- err = 0;
+ } else if (company == LM85_COMPANY_SMSC) {
+ switch (verstep) {
+ case LM85_VERSTEP_EMC6D100_A0:
+ case LM85_VERSTEP_EMC6D100_A1:
+ /* Note: we can't tell a '100 from a '101 */
+ kind = emc6d100;
+ break;
+ case LM85_VERSTEP_EMC6D102:
+ kind = emc6d102;
+ break;
+ }
+ } else {
+ dev_dbg(&adapter->dev, "Autodetection failed: "
+ "unknown vendor\n");
goto ERROR1;
}
}