Re: [PATCH 1/2] hwmon: (lm90) split set&show temp as common codes
From: Guenter Roeck
Date: Tue Feb 25 2014 - 03:57:24 EST
On 02/25/2014 12:21 AM, Wei Ni wrote:
On 02/25/2014 02:32 PM, Guenter Roeck wrote:
On 02/24/2014 10:21 PM, Wei Ni wrote:
Split set&show temp codes as common functions, so we can use it
directly when implement linux thermal framework.
And handle error return value for the lm90_select_remote_channel
and write_tempx, then set_temp8 and set_temp11 could return it
to user-space.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
---
drivers/hwmon/lm90.c | 170 ++++++++++++++++++++++++++++++++++----------------
1 file changed, 115 insertions(+), 55 deletions(-)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index c9ff08d..fb9e224 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -473,20 +473,29 @@ static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
* various registers have different meanings as a result of selecting a
* non-default remote channel.
*/
-static inline void lm90_select_remote_channel(struct i2c_client *client,
- struct lm90_data *data,
- int channel)
+static inline int lm90_select_remote_channel(struct i2c_client *client,
+ struct lm90_data *data,
+ int channel)
{
u8 config;
+ int err;
if (data->kind == max6696) {
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
config &= ~0x08;
if (channel)
config |= 0x08;
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
- config);
+ err = i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
+ config);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "Failed to select remote channel %d, err %d\n",
+ channel, err);
+ return err;
Not my call to make, but I really dislike all that new noisiness.
Sure, it is ok to pass the error back, but in my opinion that is
good enough. If every driver in the kernel would be that noisy,
the log would be all but useless.
This was discussed in https://lkml.org/lkml/2013/12/227
Jean wish to catch and return write errors,then the set_temp8() could
return error to user-space.
The link doesn't work for me. Anyway, catching write errors and being
noisy about it are different issues, and I am a bit surprised that
Jean wants the driver to be noisy about it, but if so I won't object.
Guenter
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