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Date: Fri, 3 Jun 2016 21:41:55 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: "Andrew F. Davis" <afd@...com>, Jean Delvare <jdelvare@...e.com>,
Jonathan Corbet <corbet@....net>
Cc: linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (tmp401) Add support for TI TMP461
On 05/31/2016 09:27 AM, Andrew F. Davis wrote:
> Signed-off-by: Andrew F. Davis <afd@...com>
> ---
> Documentation/hwmon/tmp401 | 18 +++++++++--
> drivers/hwmon/Kconfig | 2 +-
> drivers/hwmon/tmp401.c | 81 ++++++++++++++++++++++++++++++++++++++++++----
> 3 files changed, 92 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/hwmon/tmp401 b/Documentation/hwmon/tmp401
> index 711f75e..eaa2d3b 100644
> --- a/Documentation/hwmon/tmp401
> +++ b/Documentation/hwmon/tmp401
> @@ -22,6 +22,9 @@ Supported chips:
> Prefix: 'tmp435'
> Addresses scanned: I2C 0x48 - 0x4f
> Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp435.html
> + * Texas Instruments TMP461
> + Prefix: 'tmp461'
> + Datasheet: http://www.ti.com/product/tmp461
>
> Authors:
> Hans de Goede <hdegoede@...hat.com>
> @@ -31,8 +34,8 @@ Description
> -----------
>
> This driver implements support for Texas Instruments TMP401, TMP411,
> -TMP431, TMP432 and TMP435 chips. These chips implement one or two remote
> -and one local temperature sensors. Temperature is measured in degrees
> +TMP431, TMP432, TMP435, and TMP461 chips. These chips implement one or two
> +remote and one local temperature sensors. Temperature is measured in degrees
> Celsius. Resolution of the remote sensor is 0.0625 degree. Local
> sensor resolution can be set to 0.5, 0.25, 0.125 or 0.0625 degree (not
> supported by the driver so far, so using the default resolution of 0.5
> @@ -55,3 +58,14 @@ some additional features.
>
> TMP432 is compatible with TMP401 and TMP431. It supports two external
> temperature sensors.
> +
> +TMP461 is compatible with TMP401. It supports offset and n-factor correction
> +that is applied to the remote sensor.
> +
> +* Sensor offset values are temperature values
> +
> + Exported via sysfs attribute tempX_offset
> +
> +* n-factor correction, values are in raw form as described in the datasheet
> +
If you don't mind, I would prefer if you would drop this attribute, at least
for now, for a number of reasons. It should not really be controlled by a sysfs
attribute, but either with devicetree data or platform data. Exposing a raw
register value through sysfs isn't really desirable; sysfs is supposed
to provide some kind of abstraction. It enables setting the n-factor,
but not beta-compensation which is probably equally desirable.
Last but not least, other chips supported by this driver, as well as other chips
supported by hwmon, also support n-factor correction and beta-compensation.
If we provide this functionality we should provide it for all chips in a
generic way. In short, this needs more discussion.
Couple of additional additional comments below.
Thanks,
Guenter
> + Exported via sysfs attribute tempX_nfactor
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index ff94007..c571dcf 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1561,7 +1561,7 @@ config SENSORS_TMP401
> depends on I2C
> help
> If you say yes here you get support for Texas Instruments TMP401,
> - TMP411, TMP431, TMP432 and TMP435 temperature sensor chips.
> + TMP411, TMP431, TMP432, TMP435, and TMP461 temperature sensor chips.
>
> This driver can also be built as a module. If so, the module
> will be called tmp401.
> diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
> index ccf4cff..280065b 100644
> --- a/drivers/hwmon/tmp401.c
> +++ b/drivers/hwmon/tmp401.c
> @@ -47,7 +47,8 @@
> static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
> 0x4e, 0x4f, I2C_CLIENT_END };
>
> -enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
> +enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
> +
>
Please no double empty lines.
> /*
> * The TMP401 registers, note some registers have different addresses for
> @@ -62,31 +63,37 @@ enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
> #define TMP401_MANUFACTURER_ID_REG 0xFE
> #define TMP401_DEVICE_ID_REG 0xFF
>
> -static const u8 TMP401_TEMP_MSB_READ[6][2] = {
> +static const u8 TMP401_TEMP_MSB_READ[8][2] = {
> { 0x00, 0x01 }, /* temp */
> { 0x06, 0x08 }, /* low limit */
> { 0x05, 0x07 }, /* high limit */
> { 0x20, 0x19 }, /* therm (crit) limit */
> { 0x30, 0x34 }, /* lowest */
> { 0x32, 0x36 }, /* highest */
> + { 0, 0x11 }, /* offset */
> + { 0, 0x23 }, /* nfactor */
> };
>
> -static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
> +static const u8 TMP401_TEMP_MSB_WRITE[8][2] = {
> { 0, 0 }, /* temp (unused) */
> { 0x0C, 0x0E }, /* low limit */
> { 0x0B, 0x0D }, /* high limit */
> { 0x20, 0x19 }, /* therm (crit) limit */
> { 0x30, 0x34 }, /* lowest */
> { 0x32, 0x36 }, /* highest */
> + { 0, 0x11 }, /* offset */
> + { 0, 0x23 }, /* nfactor */
> };
>
> -static const u8 TMP401_TEMP_LSB[6][2] = {
> +static const u8 TMP401_TEMP_LSB[8][2] = {
> { 0x15, 0x10 }, /* temp */
> { 0x17, 0x14 }, /* low limit */
> { 0x16, 0x13 }, /* high limit */
> { 0, 0 }, /* therm (crit) limit (unused) */
> { 0x31, 0x35 }, /* lowest */
> { 0x33, 0x37 }, /* highest */
> + { 0, 0x12 }, /* offset */
> + { 0, 0 }, /* nfactor (unused) */
> };
>
> static const u8 TMP432_TEMP_MSB_READ[4][3] = {
> @@ -149,6 +156,7 @@ static const struct i2c_device_id tmp401_id[] = {
> { "tmp431", tmp431 },
> { "tmp432", tmp432 },
> { "tmp435", tmp435 },
> + { "tmp461", tmp461 },
Please also provide code in the detect function to auto-detect the chip.
> { }
> };
> MODULE_DEVICE_TABLE(i2c, tmp401_id);
> @@ -170,7 +178,7 @@ struct tmp401_data {
> /* register values */
> u8 status[4];
> u8 config;
> - u16 temp[6][3];
> + u16 temp[8][3];
> u8 temp_crit_hyst;
> };
>
> @@ -445,6 +453,44 @@ static ssize_t reset_temp_history(struct device *dev,
> return count;
> }
>
> +static ssize_t show_nfactor(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + int nr = to_sensor_dev_attr_2(devattr)->nr;
> + int index = to_sensor_dev_attr_2(devattr)->index;
> + struct tmp401_data *data = tmp401_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> + return sprintf(buf, "%d\n", data->temp[nr][index]);
> +}
> +
> +static ssize_t store_nfactor(struct device *dev,
> + struct device_attribute *devattr,
> + const char *buf, size_t count)
> +{
> + int nr = to_sensor_dev_attr_2(devattr)->nr;
> + int index = to_sensor_dev_attr_2(devattr)->index;
> + struct tmp401_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> + long val;
> + u8 regaddr;
> +
> + if (kstrtol(buf, 10, &val))
> + return -EINVAL;
> + val = clamp_val(val, -128, 127);
> +
> + regaddr = TMP401_TEMP_MSB_WRITE[nr][index];
> +
> + mutex_lock(&data->update_lock);
> + i2c_smbus_write_byte_data(client, regaddr, val);
> + data->temp[nr][index] = val;
> + mutex_unlock(&data->update_lock);
> +
> + return count;
> +}
> +
> static ssize_t show_update_interval(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> @@ -613,6 +659,26 @@ static const struct attribute_group tmp432_group = {
> };
>
> /*
> + * Additional features of the TMP461 chip.
> + * The TMP461 η-factor correction and temperature offset
> + * for the remote channel.
> + */
> +static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp,
> + store_temp, 6, 1);
> +static SENSOR_DEVICE_ATTR_2(temp2_nfactor, S_IWUSR | S_IRUGO, show_nfactor,
> + store_nfactor, 7, 1);
> +
> +static struct attribute *tmp461_attributes[] = {
> + &sensor_dev_attr_temp2_offset.dev_attr.attr,
> + &sensor_dev_attr_temp2_nfactor.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group tmp461_group = {
> + .attrs = tmp461_attributes,
> +};
> +
> +/*
> * Begin non sysfs callback code (aka Real code)
> */
>
> @@ -714,7 +780,7 @@ static int tmp401_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> static const char * const names[] = {
> - "TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
> + "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
> };
> struct device *dev = &client->dev;
> struct device *hwmon_dev;
> @@ -745,6 +811,9 @@ static int tmp401_probe(struct i2c_client *client,
> if (data->kind == tmp432)
> data->groups[groups++] = &tmp432_group;
>
> + if (data->kind == tmp461)
> + data->groups[groups++] = &tmp461_group;
> +
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
> data, data->groups);
> if (IS_ERR(hwmon_dev))
>
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