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SubjectRe: [PATCH] hwmon:max6697: Allow max6581 to create tempX_offset
On Mon, Jul 06, 2020 at 05:54:33PM +0000, Chu Lin wrote:
> Per max6581, reg 4d and reg 4e is used for temperature read offset.
> This patch will let the user specify the temperature read offset for
> max6581. This patch is tested on max6581 and only applies to max6581.
>

Please version your patches and provide a log of changes made.

Guenter

> Testing:
> echo 16250 > temp2_offset
> cat temp2_offset
> 16250
>
> echo 17500 > temp3_offset
> cat temp3_offset
> 17500
> cat temp4_offset
> 0
> cat temp2_offset
> 17500
>
> echo 0 > temp2_offset
> cat temp2_offset
> 0
> cat temp3_offset
> 17500
>
> echo -0 > temp2_offset
> cat temp2_offset
> 0
>
> echo -100000 > temp2_offset
> cat temp2_input
> 4875
>
> echo 10000 > temp2_offset
> cat temp2_input
> 47125
>
> echo -2000 > temp2_offset
> cat temp2_input
> 34875
>
> echo -0 > temp2_offset
> cat temp2_input
> 37000
>
> Signed-off-by: Chu Lin <linchuyuan@google.com>
> ---
> drivers/hwmon/max6697.c | 100 ++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 96 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hwmon/max6697.c b/drivers/hwmon/max6697.c
> index da43f7ae3de1..4b71b3716f22 100644
> --- a/drivers/hwmon/max6697.c
> +++ b/drivers/hwmon/max6697.c
> @@ -65,6 +65,9 @@ static const u8 MAX6697_REG_CRIT[] = {
> #define MAX6581_REG_IDEALITY_SELECT 0x4c
> #define MAX6581_REG_OFFSET 0x4d
> #define MAX6581_REG_OFFSET_SELECT 0x4e
> +#define MAX6581_OFFSET_MIN -31750
> +#define MAX6581_OFFSET_MAX 31750
> +
>
> #define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
>
> @@ -180,6 +183,11 @@ static const struct max6697_chip_data max6697_chip_data[] = {
> },
> };
>
> +static inline int max6581_offset_to_millic(int val)
> +{
> + return val & (1 << 7) ? (val | 0xffffff00) * 250 : val * 250;
> +}
> +
> static struct max6697_data *max6697_update_device(struct device *dev)
> {
> struct max6697_data *data = dev_get_drvdata(dev);
> @@ -325,6 +333,69 @@ static ssize_t temp_store(struct device *dev,
> return ret < 0 ? ret : count;
> }
>
> +static ssize_t offset_store(struct device *dev,
> + struct device_attribute *devattr, const char *buf,
> + size_t count)
> +{
> + long temp;
> + u8 val, select;
> + int ret, index;
> + struct max6697_data *data;
> +
> + index = to_sensor_dev_attr(devattr)->index;
> + data = dev_get_drvdata(dev);
> + select = i2c_smbus_read_byte_data(data->client,
> + MAX6581_REG_OFFSET_SELECT);
> + if (select < 0)
> + return select;
> + ret = kstrtol(buf, 10, &temp);
> + if (ret < 0)
> + return ret;
> + /* disable the offset for channel */
> + if (temp == 0) {
> + ret = i2c_smbus_write_byte_data(data->client,
> + MAX6581_REG_OFFSET_SELECT,
> + select & ~(1 << (index - 1)));
> + return ret < 0 ? ret : count;
> + }
> + temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
> + val = DIV_ROUND_CLOSEST(temp, 250);
> + mutex_lock(&data->update_lock);
> + ret = i2c_smbus_write_byte_data(data->client,
> + MAX6581_REG_OFFSET_SELECT,
> + select | (1 << (index - 1)));
> + if (ret < 0)
> + return ret;
> + ret = i2c_smbus_write_byte_data(data->client,
> + MAX6581_REG_OFFSET,
> + val);
> + mutex_unlock(&data->update_lock);
> + return ret < 0 ? ret : count;
> +}
> +
> +static ssize_t offset_show(struct device *dev, struct device_attribute *devattr,
> + char *buf)
> +{
> + int select, ret, index;
> + struct max6697_data *data;
> +
> + index = to_sensor_dev_attr(devattr)->index;
> + data = dev_get_drvdata(dev);
> + select = i2c_smbus_read_byte_data(data->client,
> + MAX6581_REG_OFFSET_SELECT);
> + if (select < 0)
> + return select;
> + if (select & (1 << (index - 1))) {
> + ret = i2c_smbus_read_byte_data(data->client,
> + MAX6581_REG_OFFSET);
> + if (ret < 0)
> + return ret;
> + } else {
> + return sprintf(buf, "%d\n", 0);
> + }
> + return sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
> +}
> +
> static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
> static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
> static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
> @@ -383,6 +454,15 @@ static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
> static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
> static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
>
> +/* There is no offset for local temperature so starting from temp2 */
> +static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
> +static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
> +static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
> +static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
> +static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
> +static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
> +static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);
> +
> static DEVICE_ATTR(dummy, 0, NULL, NULL);
>
> static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
> @@ -391,8 +471,8 @@ static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
> struct device *dev = container_of(kobj, struct device, kobj);
> struct max6697_data *data = dev_get_drvdata(dev);
> const struct max6697_chip_data *chip = data->chip;
> - int channel = index / 6; /* channel number */
> - int nr = index % 6; /* attribute index within channel */
> + int channel = index / 8; /* channel number */
> + int nr = index % 7; /* attribute index within channel */
>
> if (channel >= chip->channels)
> return 0;
> @@ -401,6 +481,10 @@ static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
> return 0;
> if (nr == 5 && !(chip->have_fault & (1 << channel)))
> return 0;
> + /* offset reg is only supported on max6581 remote channels */
> + if (nr == 6)
> + if (data->type != max6581 || channel == 0)
> + return 0;
>
> return attr->mode;
> }
> @@ -417,6 +501,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp1_crit.dev_attr.attr,
> &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
> &dev_attr_dummy.attr,
> + &dev_attr_dummy.attr,
>
> &sensor_dev_attr_temp2_input.dev_attr.attr,
> &sensor_dev_attr_temp2_max.dev_attr.attr,
> @@ -424,6 +509,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp2_crit.dev_attr.attr,
> &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp2_fault.dev_attr.attr,
> + &sensor_dev_attr_temp2_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp3_input.dev_attr.attr,
> &sensor_dev_attr_temp3_max.dev_attr.attr,
> @@ -431,6 +517,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp3_crit.dev_attr.attr,
> &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp3_fault.dev_attr.attr,
> + &sensor_dev_attr_temp3_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp4_input.dev_attr.attr,
> &sensor_dev_attr_temp4_max.dev_attr.attr,
> @@ -438,6 +525,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp4_crit.dev_attr.attr,
> &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp4_fault.dev_attr.attr,
> + &sensor_dev_attr_temp4_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp5_input.dev_attr.attr,
> &sensor_dev_attr_temp5_max.dev_attr.attr,
> @@ -445,6 +533,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp5_crit.dev_attr.attr,
> &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp5_fault.dev_attr.attr,
> + &sensor_dev_attr_temp5_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp6_input.dev_attr.attr,
> &sensor_dev_attr_temp6_max.dev_attr.attr,
> @@ -452,6 +541,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp6_crit.dev_attr.attr,
> &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp6_fault.dev_attr.attr,
> + &sensor_dev_attr_temp6_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp7_input.dev_attr.attr,
> &sensor_dev_attr_temp7_max.dev_attr.attr,
> @@ -459,6 +549,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp7_crit.dev_attr.attr,
> &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp7_fault.dev_attr.attr,
> + &sensor_dev_attr_temp7_offset.dev_attr.attr,
>
> &sensor_dev_attr_temp8_input.dev_attr.attr,
> &sensor_dev_attr_temp8_max.dev_attr.attr,
> @@ -466,6 +557,7 @@ static struct attribute *max6697_attributes[] = {
> &sensor_dev_attr_temp8_crit.dev_attr.attr,
> &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
> &sensor_dev_attr_temp8_fault.dev_attr.attr,
> + &sensor_dev_attr_temp8_offset.dev_attr.attr,
> NULL
> };
>
> @@ -502,8 +594,8 @@ static void max6697_get_config_of(struct device_node *node,
> }
> prop = of_get_property(node, "transistor-ideality", &len);
> if (prop && len == 2 * sizeof(u32)) {
> - pdata->ideality_mask = be32_to_cpu(prop[0]);
> - pdata->ideality_value = be32_to_cpu(prop[1]);
> + pdata->ideality_mask = be32_to_cpu(prop[0]);
> + pdata->ideality_value = be32_to_cpu(prop[1]);
> }
> }
>
> --
> 2.27.0.212.ge8ba1cc988-goog
>

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