Re: [lm-sensors] [RFC PATCH 6/9] hwmon: (lm90) Register to the thermal framework

[Wei Ni <wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

On 02/19/2013 11:42 AM, Guenter Roeck wrote:
> On Mon, Feb 18, 2013 at 07:30:28PM +0800, Wei Ni wrote:
>> Register the remote sensor to the thermal framework.
>> It can support to show the temperature and read/write threshold.
>>
>> Signed-off-by: Wei Ni <wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>> ---
>>  arch/arm/boot/dts/tegra30-cardhu.dtsi |    1 +
>>  drivers/hwmon/lm90.c                  |  182 ++++++++++++++++++++++++++++++++-
>>  2 files changed, 182 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
>> index 15ad1ad..3f6ab89 100644
>> --- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
>> +++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
>> @@ -279,6 +279,7 @@
>>  			reg = <0x4c>;
>>  			interrupt-parent = <&gpio>;
>>  			interrupts = <226 0x08>; /* gpio PCC2 */
>> +			#sensor-cells = <1>;
>>  		};
>>  	};
>>  
>> diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
>> index de5a476..0abdedc 100644
>> --- a/drivers/hwmon/lm90.c
>> +++ b/drivers/hwmon/lm90.c
>> @@ -91,6 +91,7 @@
>>  #include <linux/sysfs.h>
>>  #include <linux/interrupt.h>
>>  #include <linux/of_irq.h>
>> +#include <linux/thermal.h>
>>  
>>  /*
>>   * Addresses to scan
>> @@ -182,6 +183,15 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
>>  #define LM90_HAVE_BROKEN_ALERT	(1 << 7) /* Broken alert		*/
>>  
>>  /*
>> + * Thermal framework
>> + */
>> +enum lm90_thresholds {
>> +	LM90_LOW_THRESHOLDS = 0,	/* threshold 0: low limits */
>> +	LM90_HIGH_THRESHOLDS,		/* threshold 1: high limits */
>> +	LM90_NUM_THRESHOLDS
>> +};
>> +
>> +/*
>>   * Driver data (common to all clients)
>>   */
>>  
>> @@ -377,6 +387,9 @@ struct lm90_data {
>>  	s16 temp11[TEMP11_REG_NUM];
>>  	u8 temp_hyst;
>>  	u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
>> +
>> +	struct thermal_sensor *ts_remote;
>> +	struct thermal_sensor *ts_local;
>>  };
>>  
>>  /*
>> @@ -1493,12 +1506,151 @@ static irqreturn_t lm90_irq(int irq, void *dev_id)
>>  	return IRQ_HANDLED;
>>  }
>>  
>> +static int lm90_read_remote_temp(struct thermal_sensor *ts, long *temp)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +
>> +	_show_temp11(dev, TEMP11_REMOTE_TEMP, (int *)temp);
>> +
>> +	return 0;
>> +}
>> +
>> +static int lm90_read_remote_threshold(struct thermal_sensor *ts, int th_index,
>> +					long *val)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +	int index;
>> +
>> +	switch (th_index) {
>> +	case LM90_LOW_THRESHOLDS:
>> +		/* remote low limit */
>> +		index = TEMP11_REMOTE_LOW;
>> +		break;
>> +	case LM90_HIGH_THRESHOLDS:
>> +		/* remote high limit */
>> +		index = TEMP11_REMOTE_HIGH;
>> +		break;
>> +	default:
>> +		dev_err(dev, "read remote threshold failed.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	_show_temp11(dev, index, (int *)val);
> 
> Typecasting a pointer like this doesn't work. Try this on a big-endian system with
> sizeof(int) != sizeof(long). Note that you would not have the problem if you
> would pass the value instead of the pointer.

Yes, you are right, it will cause problems.
I will return the value for _show_temp11() and _show_temp8().

> 
>> +
>> +	return 0;
>> +}
>> +
>> +static int lm90_write_remote_threshold(struct thermal_sensor *ts, int th_index,
>> +					long val)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +	int nr, index;
>> +
>> +	switch (th_index) {
>> +	case LM90_LOW_THRESHOLDS:
>> +		/* remote low limit */
>> +		nr = NR_CHAN_0_REMOTE_LOW;
>> +		index = TEMP11_REMOTE_LOW;
>> +		break;
>> +	case LM90_HIGH_THRESHOLDS:
>> +		/* remote high limit */
>> +		nr = NR_CHAN_0_REMOTE_HIGH;
>> +		index = TEMP11_REMOTE_HIGH;
>> +		break;
>> +	default:
>> +		dev_err(dev, "write remote threshold failed.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	_set_temp11(dev, nr, index, val);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct thermal_sensor_ops remote_ops = {
>> +	.get_temp = lm90_read_remote_temp,
>> +	.get_threshold = lm90_read_remote_threshold,
>> +	.set_threshold = lm90_write_remote_threshold,
>> +};
>> +
>> +static int lm90_read_local_temp(struct thermal_sensor *ts, long *temp)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +
>> +	_show_temp11(dev, TEMP11_LOCAL_TEMP, (int *)temp);
>> +
> Same here and everywhere else.
> 
>> +	return 0;
>> +}
>> +
>> +static int lm90_read_local_threshold(struct thermal_sensor *ts, int th_index,
>> +					long *val)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +	int index;
>> +
>> +	switch (th_index) {
>> +	case LM90_LOW_THRESHOLDS:
>> +		/* local low limit */
>> +		index = TEMP8_LOCAL_LOW;
>> +		break;
>> +	case LM90_HIGH_THRESHOLDS:
>> +		/* local high limit */
>> +		index = TEMP8_LOCAL_HIGH;
>> +		break;
>> +	default:
>> +		dev_err(dev, "read local threshold failed.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	_show_temp8(dev, index, (int *)val);
>> +
>> +	return 0;
>> +}
>> +
>> +static int lm90_write_local_threshold(struct thermal_sensor *ts, int th_index,
>> +					long val)
>> +{
>> +	struct i2c_client *client = ts->devdata;
>> +	struct device *dev = &client->dev;
>> +	int index;
>> +
>> +	switch (th_index) {
>> +	case LM90_LOW_THRESHOLDS:
>> +		/* local low limit */
>> +		index = TEMP8_LOCAL_LOW;
>> +		break;
>> +	case LM90_HIGH_THRESHOLDS:
>> +		/* local high limit */
>> +		index = TEMP8_LOCAL_HIGH;
>> +		break;
>> +	default:
>> +		dev_err(dev, "write local threshold failed.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	_set_temp8(dev, index, val);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct thermal_sensor_ops local_ops = {
>> +	.get_temp = lm90_read_local_temp,
>> +	.get_threshold = lm90_read_local_threshold,
>> +	.set_threshold = lm90_write_local_threshold,
>> +};
>> +
>>  static int lm90_probe(struct i2c_client *client,
>>  		      const struct i2c_device_id *id)
>>  {
>>  	struct device *dev = &client->dev;
>>  	struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
>>  	struct lm90_data *data;
>> +	struct node_args np_args;
>>  	int err;
>>  
>>  	data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL);
>> @@ -1576,12 +1728,38 @@ static int lm90_probe(struct i2c_client *client,
>>  				       "lm90", data);
>>  		if (err < 0) {
>>  			dev_err(dev, "cannot request interrupt\n");
>> -			goto exit_remove_files;
>> +			goto exit_unregister_hwmon;
>>  		}
>>  	}
>>  
>> +	np_args.np = dev->of_node;
>> +	np_args.index = 0;
>> +	data->ts_remote = thermal_sensor_register("lm90_remote",
>> +						LM90_NUM_THRESHOLDS,
>> +						&np_args,
>> +						&remote_ops, client);
>> +	if (IS_ERR(data->ts_remote)) {
>> +		dev_err(dev, "cannot register sensor to thermal framework\n");
>> +		err = -EINVAL;
>> +		goto exit_unregister_hwmon;
>> +	}
>> +
>> +	np_args.index = 1;
>> +	data->ts_local = thermal_sensor_register("lm90_local",
>> +						LM90_NUM_THRESHOLDS,
>> +						&np_args,
>> +						&local_ops, client);
>> +
>> +	if (IS_ERR(data->ts_local)) {
>> +		dev_err(dev, "cannot register sensor to thermal framework\n");
>> +		err = -EINVAL;
>> +		goto exit_unregister_hwmon;
>> +	}
>> +
> 
> How about the second remote sensor ? Granted, not all chips supported by this
> driver have it, but if we are adding this we might as well add it for all
> sensors on all chips.

Ok, I will improve it.

> 
>>  	return 0;
>>  
>> +exit_unregister_hwmon:
>> +	hwmon_device_unregister(data->hwmon_dev);
>>  exit_remove_files:
>>  	lm90_remove_files(client, data);
>>  exit_restore:
>> @@ -1594,6 +1772,8 @@ static int lm90_remove(struct i2c_client *client)
>>  	struct lm90_data *data = i2c_get_clientdata(client);
>>  
>>  	free_irq(client->irq, data);
>> +	thermal_sensor_unregister(data->ts_remote);
>> +	thermal_sensor_unregister(data->ts_local);
>>  	hwmon_device_unregister(data->hwmon_dev);
>>  	lm90_remove_files(client, data);
>>  	lm90_restore_conf(client, data);
>> -- 
>> 1.7.9.5
>>
>>
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