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authorJean Delvare <khali@linux-fr.org>2005-10-26 23:37:52 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-29 01:02:14 +0400
commit8256fe0f40f1cd72f80f2c46fe0ab1638f03a98d (patch)
tree7a61802fe469ad3f199506ed832ad460d32b3649 /drivers/hwmon/lm90.c
parente8aac4a9b417643dd9739b48473790a09b8b6cbe (diff)
downloadlinux-8256fe0f40f1cd72f80f2c46fe0ab1638f03a98d.tar.xz
[PATCH] hwmon: Separate the lm90 register read function
Preparatory patch to add PEC support to the lm90 driver. We need a centralized function to read register values, where the PEC code will be later inserted. A positive side effect is that read errors are now handled properly. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/hwmon/lm90.c')
-rw-r--r--drivers/hwmon/lm90.c107
1 files changed, 53 insertions, 54 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index dad0f1074956..5acc12ae4e36 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -349,6 +349,22 @@ static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
* Real code
*/
+static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
+{
+ int err;
+
+ err = i2c_smbus_read_byte_data(client, reg);
+
+ if (err < 0) {
+ dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
+ reg, err);
+ return err;
+ }
+ *value = err;
+
+ return 0;
+}
+
static int lm90_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
@@ -402,20 +418,22 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
if (kind < 0) { /* detection and identification */
u8 man_id, chip_id, reg_config1, reg_convrate;
- man_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_MAN_ID);
- chip_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CHIP_ID);
- reg_config1 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG1);
- reg_convrate = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONVRATE);
+ if (lm90_read_reg(new_client, LM90_REG_R_MAN_ID,
+ &man_id) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CHIP_ID,
+ &chip_id) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CONFIG1,
+ &reg_config1) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CONVRATE,
+ &reg_convrate) < 0)
+ goto exit_free;
if (man_id == 0x01) { /* National Semiconductor */
u8 reg_config2;
- reg_config2 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG2);
+ if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2,
+ &reg_config2) < 0)
+ goto exit_free;
if ((reg_config1 & 0x2A) == 0x00
&& (reg_config2 & 0xF8) == 0x00
@@ -547,7 +565,10 @@ static void lm90_init_client(struct i2c_client *client)
*/
i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
5); /* 2 Hz */
- config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
+ if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
+ dev_warn(&client->dev, "Initialization failed!\n");
+ return;
+ }
if (config & 0x40)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config & 0xBF); /* run */
@@ -575,21 +596,15 @@ static struct lm90_data *lm90_update_device(struct device *dev)
down(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
- u8 oldh, newh;
+ u8 oldh, newh, l;
dev_dbg(&client->dev, "Updating lm90 data.\n");
- data->temp8[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_TEMP);
- data->temp8[1] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_LOW);
- data->temp8[2] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_HIGH);
- data->temp8[3] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_CRIT);
- data->temp8[4] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_CRIT);
- data->temp_hyst = i2c_smbus_read_byte_data(client,
- LM90_REG_R_TCRIT_HYST);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
+ lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
+ lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
/*
* There is a trick here. We have to read two registers to
@@ -605,36 +620,20 @@ static struct lm90_data *lm90_update_device(struct device *dev)
* then we have a valid reading. Else we have to read the low
* byte again, and now we believe we have a correct reading.
*/
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
- newh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- if (newh != oldh) {
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
-#ifdef DEBUG
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- /* oldh is actually newer */
- if (newh != oldh)
- dev_warn(&client->dev, "Remote temperature may be "
- "wrong.\n");
-#endif
- }
- data->temp11[0] |= (newh << 8);
-
- data->temp11[1] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWL);
- data->temp11[2] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHL);
- data->alarms = i2c_smbus_read_byte_data(client,
- LM90_REG_R_STATUS);
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
+ && (newh == oldh
+ || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
+ data->temp11[0] = (newh << 8) | l;
+
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
+ data->temp11[1] = (newh << 8) | l;
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
+ data->temp11[2] = (newh << 8) | l;
+ lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
data->last_updated = jiffies;
data->valid = 1;