linux-kernel - Re: [PATCH linux v3 3/3] drivers: w1: add hwmon temp support for w1

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Date:   Thu, 13 Jul 2017 14:40:00 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jaghathiswari Rankappagounder Natarajan <jaghu@...gle.com>
Cc:     zbr@...emap.net, linux-kernel@...r.kernel.org, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH linux v3 3/3] drivers: w1: add hwmon temp support for
 w1_therm

On Thu, Jul 13, 2017 at 02:06:49PM -0700, Jaghathiswari Rankappagounder Natarajan wrote:
> This change adds hwmon temp support for w1_therm.
> 
> Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@...gle.com>
> Acked-by: Evgeniy Polyakov <zbr@...emap.net>
> ---
> v2
> - make changes to support hwmon_device_register_with_info mentioned by Guenter.
> 
> v3
> - used IS_REACHABLE()
> - rearranged the code to not require forward declarations
> - used family_data
> - incremented the reference count with the bus mutex locked
> - corrected indentation
> - removed dev_warn message
> - simplified returning mode
> - removed write function
> 
>  drivers/w1/slaves/w1_therm.c | 91 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 91 insertions(+)
> 
> diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
> index 64e6a8f38410..b7d13220dd8f 100644
> --- a/drivers/w1/slaves/w1_therm.c
> +++ b/drivers/w1/slaves/w1_therm.c
> @@ -29,6 +29,7 @@
>  #include <linux/types.h>
>  #include <linux/slab.h>
>  #include <linux/delay.h>
> +#include <linux/hwmon.h>
> 
>  #include "../w1.h"
>  #include "../w1_int.h"
> @@ -118,19 +119,77 @@ static struct attribute *w1_ds28ea00_attrs[] = {
>  	&dev_attr_w1_seq.attr,
>  	NULL,
>  };
> +
>  ATTRIBUTE_GROUPS(w1_therm);
>  ATTRIBUTE_GROUPS(w1_ds28ea00);
> 
> +#if IS_REACHABLE(CONFIG_HWMON)
> +static int w1_read_temp(struct device *dev, u32 attr, int channel,
> +			long *val);
> +
> +static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type,
> +			     u32 attr, int channel)
> +{
> +	return attr == hwmon_temp_input ? 0444 : 0;
> +}
> +
> +static int w1_read(struct device *dev, enum hwmon_sensor_types type,
> +		   u32 attr, int channel, long *val)
> +{
> +	switch (type) {
> +	case hwmon_temp:
> +		return w1_read_temp(dev, attr, channel, val);
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}
> +
> +static const u32 w1_temp_config[] = {
> +	HWMON_T_INPUT,
> +	0
> +};
> +
> +static const struct hwmon_channel_info w1_temp = {
> +	.type = hwmon_temp,
> +	.config = w1_temp_config,
> +};
> +
> +static const struct hwmon_channel_info *w1_info[] = {
> +	&w1_temp,
> +	NULL
> +};
> +
> +static const struct hwmon_ops w1_hwmon_ops = {
> +	.is_visible = w1_is_visible,
> +	.read = w1_read,
> +};
> +
> +static const struct hwmon_chip_info w1_chip_info = {
> +	.ops = &w1_hwmon_ops,
> +	.info = w1_info,
> +};

#define W1_CHIPINFO	(&w1_chip_info)

#else

#define	W1_CHIPINFO	NULL

[saves you a couple of ifdefs]

> +#endif


> +
>  static struct w1_family_ops w1_therm_fops = {
>  	.add_slave	= w1_therm_add_slave,
>  	.remove_slave	= w1_therm_remove_slave,
>  	.groups		= w1_therm_groups,
> +#if IS_REACHABLE(CONFIG_HWMON)
> +	.chip_info	= &w1_chip_info,
> +#else
> +	.chip_info	= NULL,
> +#endif
	.chip_info	= W1_CHIP_INFO,

>  };
> 
>  static struct w1_family_ops w1_ds28ea00_fops = {
>  	.add_slave	= w1_therm_add_slave,
>  	.remove_slave	= w1_therm_remove_slave,
>  	.groups		= w1_ds28ea00_groups,
> +#if IS_REACHABLE(CONFIG_HWMON)
> +	.chip_info	= &w1_chip_info,
> +#else
> +	.chip_info	= NULL,
> +#endif
	.chip_info	= W1_CHIP_INFO,
>  };
> 
>  static struct w1_family w1_therm_family_DS18S20 = {
> @@ -559,6 +618,38 @@ static ssize_t w1_slave_show(struct device *device,
>  	return ret;
>  }
> 
> +#if IS_REACHABLE(CONFIG_HWMON)
> +static int w1_read_temp(struct device *device, u32 attr, int channel,
> +			long *val)
> +{
> +	struct w1_slave *sl = dev_get_drvdata(device);
> +	struct therm_info info;
> +	u8 fid = sl->family->fid;
> +	int ret;
> +
> +	switch (attr) {
> +	case hwmon_temp_input:
> +		ret = read_therm(device, sl, &info);
> +		if (ret)
> +			return ret;
> +
> +		if (!info.verdict) {
> +			ret = -EIO;
> +			return ret;
> +		}
> +
> +		*val = w1_convert_temp(info.rom, fid);
> +		ret = 0;
> +		break;
> +	default:
> +			ret = -EOPNOTSUPP;

Formatting ?

> +		break;
> +	}
> +
> +	return ret;
> +}
> +#endif
> +
>  #define W1_42_CHAIN	0x99
>  #define W1_42_CHAIN_OFF	0x3C
>  #define W1_42_CHAIN_OFF_INV	0xC3
> --
> 2.13.2.932.g7449e964c-goog
>