Re: [PATCH v4 1/3] hwmon: (lm90) Define status bits

[Guenter Roeck <linux@roeck-us.net>]

On Wed, Oct 30, 2013 at 04:41:13PM +0100, Jean Delvare wrote:
> Hi Wei,
> 
> On Wed, 7 Aug 2013 14:18:24 +0800, Wei Ni wrote:
> > Add bit defines for the status register. And add a function
> > lm90_is_tripped() which will read status register and return
> > tripped or not, then lm90_alert can call it directly, and in the
> > future the IRQ thread also can use it.
> > 
> > Signed-off-by: Wei Ni <wni@nvidia.com>
> > ---
> >  drivers/hwmon/lm90.c |   75 +++++++++++++++++++++++++++++++++-----------------
> >  1 file changed, 50 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
> > index cdff742..1da2eff 100644
> > --- a/drivers/hwmon/lm90.c
> > +++ b/drivers/hwmon/lm90.c
> > @@ -179,6 +179,18 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
> >  #define LM90_HAVE_TEMP3		(1 << 6) /* 3rd temperature sensor	*/
> >  #define LM90_HAVE_BROKEN_ALERT	(1 << 7) /* Broken alert		*/
> >  
> > +/* LM90 status */
> > +#define LM90_STATUS_LTHRM	(1 << 0) /* local THERM limit tripped */
> > +#define LM90_STATUS_RTHRM	(1 << 1) /* remote THERM limit tripped */
> > +#define LM90_STATUS_OPEN	(1 << 2) /* remote is an open circuit */
> > +#define LM90_STATUS_RLOW	(1 << 3) /* remote low temp limit tripped */
> > +#define LM90_STATUS_RHIGH	(1 << 4) /* remote high temp limit tripped */
> > +#define LM90_STATUS_LLOW	(1 << 5) /* local low temp limit tripped */
> > +#define LM90_STATUS_LHIGH	(1 << 6) /* local high temp limit tripped */
> > +
> > +#define MAX6696_STATUS2_RLOW	(1 << 3) /* remote2 low temp limit tripped */
> > +#define MAX6696_STATUS2_RHIGH	(1 << 4) /* remote2 high temp limit tripped */
> > +
> >  /*
> >   * Driver data (common to all clients)
> >   */
> > @@ -1391,6 +1403,36 @@ static void lm90_init_client(struct i2c_client *client)
> >  		i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
> >  }
> >  
> > +static bool lm90_is_tripped(struct i2c_client *client)
> > +{
> > +	struct lm90_data *data = i2c_get_clientdata(client);
> > +	u8 status, status2 = 0;
> > +
> > +	lm90_read_reg(client, LM90_REG_R_STATUS, &status);
> > +
> > +	if (data->kind == max6696)
> > +		lm90_read_reg(client, MAX6696_REG_R_STATUS2, &status2);
> > +
> > +	if ((status & 0x7f) == 0 && (status2 & 0xfe) == 0)
> > +		return false;
> > +
> > +	if (status & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM))
> > +		dev_warn(&client->dev,
> > +			 "temp%d out of range, please check!\n", 1);
> > +	if (status & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM))
> > +		dev_warn(&client->dev,
> > +			 "temp%d out of range, please check!\n", 2);
> > +	if (status & LM90_STATUS_OPEN)
> > +		dev_warn(&client->dev,
> > +			 "temp%d diode open, please check!\n", 2);
> > +
> > +	if (status2 & (MAX6696_STATUS2_RLOW | MAX6696_STATUS2_RHIGH))
> > +		dev_warn(&client->dev,
> > +			 "temp%d out of range, please check!\n", 3);
> > +

I am also a bit concerned about the misleading function name. 
I would expect something like "is_tripped" to return true or false,
not to dump log messages to the console.

Guenter

> > +	return true;
> > +}
> > +
> >  static int lm90_probe(struct i2c_client *client,
> >  		      const struct i2c_device_id *id)
> >  {
> > @@ -1489,36 +1531,17 @@ static int lm90_remove(struct i2c_client *client)
> >  
> >  static void lm90_alert(struct i2c_client *client, unsigned int flag)
> >  {
> > -	struct lm90_data *data = i2c_get_clientdata(client);
> > -	u8 config, alarms, alarms2 = 0;
> > -
> > -	lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
> > -
> > -	if (data->kind == max6696)
> > -		lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
> > -
> > -	if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
> > -		dev_info(&client->dev, "Everything OK\n");
> > -	} else {
> > -		if (alarms & 0x61)
> > -			dev_warn(&client->dev,
> > -				 "temp%d out of range, please check!\n", 1);
> > -		if (alarms & 0x1a)
> > -			dev_warn(&client->dev,
> > -				 "temp%d out of range, please check!\n", 2);
> > -		if (alarms & 0x04)
> > -			dev_warn(&client->dev,
> > -				 "temp%d diode open, please check!\n", 2);
> > -
> > -		if (alarms2 & 0x18)
> > -			dev_warn(&client->dev,
> > -				 "temp%d out of range, please check!\n", 3);
> > -
> > +	if (lm90_is_tripped(client)) {
> 
> You are reading LM90_REG_R_STATUS here...
> 
> >  		/*
> >  		 * Disable ALERT# output, because these chips don't implement
> >  		 * SMBus alert correctly; they should only hold the alert line
> >  		 * low briefly.
> >  		 */
> > +		struct lm90_data *data = i2c_get_clientdata(client);
> > +		u8 config, alarms;
> > +
> > +		lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
> 
> ... and here again. I already complained about this in my previous
> review of this patch, and you were supposed to address it, but you did
> not. As a result I am still not happy with this patch and I can't apply
> it, sorry.
> 
> > +
> >  		if ((data->flags & LM90_HAVE_BROKEN_ALERT)
> >  		 && (alarms & data->alert_alarms)) {
> >  			dev_dbg(&client->dev, "Disabling ALERT#\n");
> > @@ -1526,6 +1549,8 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
> >  			i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
> >  						  config | 0x80);
> >  		}
> > +	} else {
> > +		dev_info(&client->dev, "Everything OK\n");
> >  	}
> >  }
> >  
> 
> -- 
> Jean Delvare
>