Re: [PATCH] i2c driver fixes for 2.6.0
From: Greg KH
Date: Tue Dec 30 2003 - 18:17:23 EST
ChangeSet 1.1496.8.40, 2003/12/30 12:10:39-08:00, khali@xxxxxxxxxxxx
[PATCH] I2C: lm83 driver updates
Here is a patch for the lm83 driver, to be applied on top of your
pending patches stack. What it does:
* Remove limit initialisation by the driver. This is a backport from
CVS.
* A few whitespace changes inspired by my recent porting of the lm90
driver.
drivers/i2c/chips/lm83.c | 37 ++++++++++++-------------------------
1 files changed, 12 insertions(+), 25 deletions(-)
diff -Nru a/drivers/i2c/chips/lm83.c b/drivers/i2c/chips/lm83.c
--- a/drivers/i2c/chips/lm83.c Tue Dec 30 12:27:57 2003
+++ b/drivers/i2c/chips/lm83.c Tue Dec 30 12:27:57 2003
@@ -41,7 +41,7 @@
static unsigned short normal_i2c[] = { I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { 0x18, 0x1a, 0x29, 0x2b,
- 0x4c, 0x4e, I2C_CLIENT_END };
+ 0x4c, 0x4e, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END };
@@ -78,16 +78,13 @@
#define LM83_REG_W_TCRIT 0x5A
/*
- * Conversions, initial values and various macros
+ * Conversions and various macros
* The LM83 uses signed 8-bit values.
*/
#define TEMP_FROM_REG(val) ((val > 127 ? val-256 : val) * 1000)
#define TEMP_TO_REG(val) ((val < 0 ? val+256 : val) / 1000)
-#define LM83_INIT_HIGH 100
-#define LM83_INIT_CRIT 120
-
static const u8 LM83_REG_R_TEMP[] = {
LM83_REG_R_LOCAL_TEMP,
LM83_REG_R_REMOTE1_TEMP,
@@ -114,9 +111,7 @@
*/
static int lm83_attach_adapter(struct i2c_adapter *adapter);
-static int lm83_detect(struct i2c_adapter *adapter, int address,
- int kind);
-static void lm83_init_client(struct i2c_client *client);
+static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm83_detach_client(struct i2c_client *client);
static void lm83_update_client(struct i2c_client *client);
@@ -137,8 +132,7 @@
* Client data (each client gets its own)
*/
-struct lm83_data
-{
+struct lm83_data {
struct semaphore update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
@@ -233,8 +227,7 @@
* The following function does more than just detection. If detection
* succeeds, it also registers the new chip.
*/
-static int lm83_detect(struct i2c_adapter *adapter, int address,
- int kind)
+static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct lm83_data *data;
@@ -290,6 +283,7 @@
LM83_REG_R_MAN_ID);
chip_id = i2c_smbus_read_byte_data(new_client,
LM83_REG_R_CHIP_ID);
+
if (man_id == 0x01) { /* National Semiconductor */
if (chip_id == 0x03) {
kind = lm83;
@@ -315,8 +309,10 @@
if ((err = i2c_attach_client(new_client)))
goto exit_free;
- /* Initialize the LM83 chip */
- lm83_init_client(new_client);
+ /*
+ * Initialize the LM83 chip
+ * (Nothing to do for this one.)
+ */
/* Register sysfs hooks */
device_create_file(&new_client->dev, &dev_attr_temp_input1);
@@ -338,17 +334,6 @@
return err;
}
-static void lm83_init_client(struct i2c_client *client)
-{
- int nr;
-
- for (nr = 0; nr < 4; nr++)
- i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr],
- TEMP_TO_REG(LM83_INIT_HIGH));
- i2c_smbus_write_byte_data(client, LM83_REG_W_TCRIT,
- TEMP_TO_REG(LM83_INIT_CRIT));
-}
-
static int lm83_detach_client(struct i2c_client *client)
{
int err;
@@ -373,6 +358,7 @@
(jiffies < data->last_updated) ||
!data->valid) {
int nr;
+
dev_dbg(&client->dev, "Updating lm83 data.\n");
for (nr = 0; nr < 4 ; nr++) {
data->temp_input[nr] =
@@ -388,6 +374,7 @@
i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
<< 8);
+
data->last_updated = jiffies;
data->valid = 1;
}
-
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