Re: [PATCH v4] hwmon: (nct6775) add support for TSI temperature registers

From: Guenter Roeck
Date: Fri Jan 14 2022 - 11:37:41 EST

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In reply to: Zev Weiss: "[PATCH v4] hwmon: (nct6775) add support for TSI temperature registers"
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On Thu, Jan 13, 2022 at 08:46:29AM -0800, Zev Weiss wrote:
> These registers report CPU temperatures (and, depending on the system,
> sometimes chipset temperatures) via the TSI interface on AMD systems.
> They're distinct from most of the other Super-IO temperature readings
> (CPUTIN, SYSTIN, etc.) in that they're not a selectable source for
> monitoring and are in a different (higher resolution) format, but can
> still provide useful temperature data.
>
> Signed-off-by: Zev Weiss <zev@xxxxxxxxxxxxxxxxx>
> Tested-by: Renze Nicolai <renze@xxxxxxxxx>

Applied to hwmon-next.

Thanks,
Guenter

> ---
>
> This patch has been tested on NCT6779 and NCT6798[0] hardware on
> (respectively) ASRock Rack ROMED8HM3 and X570D4U boards, and seems to
> work as expected; the implementation for the other chips supported by
> the driver is purely based on the datasheets and has not been tested
> (for lack of available hardware).
>
> [0] Or at least, its chip ID registers identify it as an NCT6798 and
> it seems to behave consistently with that, though it's actually
> physically labeled as an NCT6796.
>
> Changes since v3 [1]:
> - removed "unknown number of TSI temp registers" warning
>
> Changes since v2 [2]:
> - fixed a pair of <= that should have been < in is_word_sized()
> - fixed nct6116 switch case mistakenly referencing NCT6106_REG_TSI_TEMP
>
> Changes since v1 [3]:
> - simplified logic in is_word_sized()
>
> [1] https://lore.kernel.org/linux-hwmon/20220112034824.3467-1-zev@xxxxxxxxxxxxxxxxx/
> [2] https://lore.kernel.org/linux-hwmon/20211226051438.5081-1-zev@xxxxxxxxxxxxxxxxx/
> [3] https://lore.kernel.org/linux-hwmon/Yb7RVu6fQc+tLIAg@xxxxxxxxxxxxxxxxxxxxxxxx/
>
> drivers/hwmon/nct6775.c | 129 ++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 123 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
> index fd3f91cb01c6..6c1ad82ad54b 100644
> --- a/drivers/hwmon/nct6775.c
> +++ b/drivers/hwmon/nct6775.c
> @@ -308,6 +308,7 @@ static void superio_exit(struct nct6775_sio_data *sio_data)
>
> #define NUM_TEMP 10 /* Max number of temp attribute sets w/ limits*/
> #define NUM_TEMP_FIXED 6 /* Max number of fixed temp attribute sets */
> +#define NUM_TSI_TEMP 8 /* Max number of TSI temp register pairs */
>
> #define NUM_REG_ALARM 7 /* Max number of alarm registers */
> #define NUM_REG_BEEP 5 /* Max number of beep registers */
> @@ -498,6 +499,8 @@ static const u16 NCT6775_REG_TEMP_CRIT[32] = {
> [11] = 0xa07
> };
>
> +static const u16 NCT6775_REG_TSI_TEMP[] = { 0x669 };
> +
> /* NCT6776 specific data */
>
> /* STEP_UP_TIME and STEP_DOWN_TIME regs are swapped for all chips but NCT6775 */
> @@ -581,6 +584,9 @@ static const u16 NCT6776_REG_TEMP_CRIT[32] = {
> [12] = 0x70a,
> };
>
> +static const u16 NCT6776_REG_TSI_TEMP[] = {
> + 0x409, 0x40b, 0x40d, 0x40f, 0x411, 0x413, 0x415, 0x417 };
> +
> /* NCT6779 specific data */
>
> static const u16 NCT6779_REG_IN[] = {
> @@ -864,6 +870,8 @@ static const char *const nct6796_temp_label[] = {
> #define NCT6796_TEMP_MASK 0xbfff0ffe
> #define NCT6796_VIRT_TEMP_MASK 0x80000c00
>
> +static const u16 NCT6796_REG_TSI_TEMP[] = { 0x409, 0x40b };
> +
> static const char *const nct6798_temp_label[] = {
> "",
> "SYSTIN",
> @@ -1005,6 +1013,8 @@ static const u16 NCT6106_REG_TEMP_CRIT[32] = {
> [12] = 0x205,
> };
>
> +static const u16 NCT6106_REG_TSI_TEMP[] = { 0x59, 0x5b, 0x5d, 0x5f, 0x61, 0x63, 0x65, 0x67 };
> +
> /* NCT6112D/NCT6114D/NCT6116D specific data */
>
> static const u16 NCT6116_REG_FAN[] = { 0x20, 0x22, 0x24, 0x26, 0x28 };
> @@ -1069,6 +1079,8 @@ static const s8 NCT6116_BEEP_BITS[] = {
> 34, -1 /* intrusion0, intrusion1 */
> };
>
> +static const u16 NCT6116_REG_TSI_TEMP[] = { 0x59, 0x5b };
> +
> static enum pwm_enable reg_to_pwm_enable(int pwm, int mode)
> {
> if (mode == 0 && pwm == 255)
> @@ -1169,6 +1181,12 @@ static inline u8 in_to_reg(u32 val, u8 nr)
> return clamp_val(DIV_ROUND_CLOSEST(val * 100, scale_in[nr]), 0, 255);
> }
>
> +/* TSI temperatures are in 8.3 format */
> +static inline unsigned int tsi_temp_from_reg(unsigned int reg)
> +{
> + return (reg >> 5) * 125;
> +}
> +
> /*
> * Data structures and manipulation thereof
> */
> @@ -1179,7 +1197,7 @@ struct nct6775_data {
> enum kinds kind;
> const char *name;
>
> - const struct attribute_group *groups[6];
> + const struct attribute_group *groups[7];
>
> u16 reg_temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
> * 3=temp_crit, 4=temp_lcrit
> @@ -1240,6 +1258,8 @@ struct nct6775_data {
> const u16 *REG_ALARM;
> const u16 *REG_BEEP;
>
> + const u16 *REG_TSI_TEMP;
> +
> unsigned int (*fan_from_reg)(u16 reg, unsigned int divreg);
> unsigned int (*fan_from_reg_min)(u16 reg, unsigned int divreg);
>
> @@ -1267,6 +1287,7 @@ struct nct6775_data {
> s8 temp_offset[NUM_TEMP_FIXED];
> s16 temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
> * 3=temp_crit, 4=temp_lcrit */
> + s16 tsi_temp[NUM_TSI_TEMP];
> u64 alarms;
> u64 beeps;
>
> @@ -1315,6 +1336,7 @@ struct nct6775_data {
>
> u16 have_temp;
> u16 have_temp_fixed;
> + u16 have_tsi_temp;
> u16 have_in;
>
> /* Remember extra register values over suspend/resume */
> @@ -1464,13 +1486,15 @@ static bool is_word_sized(struct nct6775_data *data, u16 reg)
> switch (data->kind) {
> case nct6106:
> return reg == 0x20 || reg == 0x22 || reg == 0x24 ||
> + (reg >= 0x59 && reg < 0x69 && (reg & 1)) ||
> reg == 0xe0 || reg == 0xe2 || reg == 0xe4 ||
> reg == 0x111 || reg == 0x121 || reg == 0x131;
> case nct6116:
> return reg == 0x20 || reg == 0x22 || reg == 0x24 ||
> - reg == 0x26 || reg == 0x28 || reg == 0xe0 || reg == 0xe2 ||
> - reg == 0xe4 || reg == 0xe6 || reg == 0xe8 || reg == 0x111 ||
> - reg == 0x121 || reg == 0x131 || reg == 0x191 || reg == 0x1a1;
> + reg == 0x26 || reg == 0x28 || reg == 0x59 || reg == 0x5b ||
> + reg == 0xe0 || reg == 0xe2 || reg == 0xe4 || reg == 0xe6 ||
> + reg == 0xe8 || reg == 0x111 || reg == 0x121 || reg == 0x131 ||
> + reg == 0x191 || reg == 0x1a1;
> case nct6775:
> return (((reg & 0xff00) == 0x100 ||
> (reg & 0xff00) == 0x200) &&
> @@ -1479,7 +1503,7 @@ static bool is_word_sized(struct nct6775_data *data, u16 reg)
> (reg & 0x00ff) == 0x55)) ||
> (reg & 0xfff0) == 0x630 ||
> reg == 0x640 || reg == 0x642 ||
> - reg == 0x662 ||
> + reg == 0x662 || reg == 0x669 ||
> ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
> reg == 0x73 || reg == 0x75 || reg == 0x77;
> case nct6776:
> @@ -1490,6 +1514,7 @@ static bool is_word_sized(struct nct6775_data *data, u16 reg)
> (reg & 0x00ff) == 0x55)) ||
> (reg & 0xfff0) == 0x630 ||
> reg == 0x402 ||
> + (reg >= 0x409 && reg < 0x419 && (reg & 1)) ||
> reg == 0x640 || reg == 0x642 ||
> ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
> reg == 0x73 || reg == 0x75 || reg == 0x77;
> @@ -1504,6 +1529,7 @@ static bool is_word_sized(struct nct6775_data *data, u16 reg)
> return reg == 0x150 || reg == 0x153 || reg == 0x155 ||
> (reg & 0xfff0) == 0x4c0 ||
> reg == 0x402 ||
> + (reg >= 0x409 && reg < 0x419 && (reg & 1)) ||
> reg == 0x63a || reg == 0x63c || reg == 0x63e ||
> reg == 0x640 || reg == 0x642 || reg == 0x64a ||
> reg == 0x64c ||
> @@ -1987,6 +2013,12 @@ static struct nct6775_data *nct6775_update_device(struct device *dev)
> data->REG_TEMP_OFFSET[i]);
> }
>
> + for (i = 0; i < NUM_TSI_TEMP; i++) {
> + if (!(data->have_tsi_temp & BIT(i)))
> + continue;
> + data->tsi_temp[i] = data->read_value(data, data->REG_TSI_TEMP[i]);
> + }
> +
> data->alarms = 0;
> for (i = 0; i < NUM_REG_ALARM; i++) {
> u8 alarm;
> @@ -2670,6 +2702,44 @@ static const struct sensor_template_group nct6775_temp_template_group = {
> .base = 1,
> };
>
> +static ssize_t show_tsi_temp(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct nct6775_data *data = nct6775_update_device(dev);
> + struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
> +
> + return sysfs_emit(buf, "%u\n", tsi_temp_from_reg(data->tsi_temp[sattr->index]));
> +}
> +
> +static ssize_t show_tsi_temp_label(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
> +
> + return sysfs_emit(buf, "TSI%d_TEMP\n", sattr->index);
> +}
> +
> +SENSOR_TEMPLATE(tsi_temp_input, "temp%d_input", 0444, show_tsi_temp, NULL, 0);
> +SENSOR_TEMPLATE(tsi_temp_label, "temp%d_label", 0444, show_tsi_temp_label, NULL, 0);
> +
> +static umode_t nct6775_tsi_temp_is_visible(struct kobject *kobj, struct attribute *attr,
> + int index)
> +{
> + struct device *dev = kobj_to_dev(kobj);
> + struct nct6775_data *data = dev_get_drvdata(dev);
> + int temp = index / 2;
> +
> + return (data->have_tsi_temp & BIT(temp)) ? attr->mode : 0;
> +}
> +
> +/*
> + * The index calculation in nct6775_tsi_temp_is_visible() must be kept in
> + * sync with the size of this array.
> + */
> +static struct sensor_device_template *nct6775_tsi_temp_template[] = {
> + &sensor_dev_template_tsi_temp_input,
> + &sensor_dev_template_tsi_temp_label,
> + NULL
> +};
> +
> static ssize_t
> show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
> {
> @@ -3948,10 +4018,11 @@ static int nct6775_probe(struct platform_device *pdev)
> const u16 *reg_temp, *reg_temp_over, *reg_temp_hyst, *reg_temp_config;
> const u16 *reg_temp_mon, *reg_temp_alternate, *reg_temp_crit;
> const u16 *reg_temp_crit_l = NULL, *reg_temp_crit_h = NULL;
> - int num_reg_temp, num_reg_temp_mon;
> + int num_reg_temp, num_reg_temp_mon, num_reg_tsi_temp;
> u8 cr2a;
> struct attribute_group *group;
> struct device *hwmon_dev;
> + struct sensor_template_group tsi_temp_tg;
> int num_attr_groups = 0;
>
> if (sio_data->access == access_direct) {
> @@ -4043,11 +4114,13 @@ static int nct6775_probe(struct platform_device *pdev)
> data->ALARM_BITS = NCT6106_ALARM_BITS;
> data->REG_BEEP = NCT6106_REG_BEEP;
> data->BEEP_BITS = NCT6106_BEEP_BITS;
> + data->REG_TSI_TEMP = NCT6106_REG_TSI_TEMP;
>
> reg_temp = NCT6106_REG_TEMP;
> reg_temp_mon = NCT6106_REG_TEMP_MON;
> num_reg_temp = ARRAY_SIZE(NCT6106_REG_TEMP);
> num_reg_temp_mon = ARRAY_SIZE(NCT6106_REG_TEMP_MON);
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6106_REG_TSI_TEMP);
> reg_temp_over = NCT6106_REG_TEMP_OVER;
> reg_temp_hyst = NCT6106_REG_TEMP_HYST;
> reg_temp_config = NCT6106_REG_TEMP_CONFIG;
> @@ -4116,11 +4189,13 @@ static int nct6775_probe(struct platform_device *pdev)
> data->ALARM_BITS = NCT6116_ALARM_BITS;
> data->REG_BEEP = NCT6106_REG_BEEP;
> data->BEEP_BITS = NCT6116_BEEP_BITS;
> + data->REG_TSI_TEMP = NCT6116_REG_TSI_TEMP;
>
> reg_temp = NCT6106_REG_TEMP;
> reg_temp_mon = NCT6106_REG_TEMP_MON;
> num_reg_temp = ARRAY_SIZE(NCT6106_REG_TEMP);
> num_reg_temp_mon = ARRAY_SIZE(NCT6106_REG_TEMP_MON);
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6116_REG_TSI_TEMP);
> reg_temp_over = NCT6106_REG_TEMP_OVER;
> reg_temp_hyst = NCT6106_REG_TEMP_HYST;
> reg_temp_config = NCT6106_REG_TEMP_CONFIG;
> @@ -4191,11 +4266,13 @@ static int nct6775_probe(struct platform_device *pdev)
> data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
> data->REG_ALARM = NCT6775_REG_ALARM;
> data->REG_BEEP = NCT6775_REG_BEEP;
> + data->REG_TSI_TEMP = NCT6775_REG_TSI_TEMP;
>
> reg_temp = NCT6775_REG_TEMP;
> reg_temp_mon = NCT6775_REG_TEMP_MON;
> num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
> num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6775_REG_TSI_TEMP);
> reg_temp_over = NCT6775_REG_TEMP_OVER;
> reg_temp_hyst = NCT6775_REG_TEMP_HYST;
> reg_temp_config = NCT6775_REG_TEMP_CONFIG;
> @@ -4264,11 +4341,13 @@ static int nct6775_probe(struct platform_device *pdev)
> data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
> data->REG_ALARM = NCT6775_REG_ALARM;
> data->REG_BEEP = NCT6776_REG_BEEP;
> + data->REG_TSI_TEMP = NCT6776_REG_TSI_TEMP;
>
> reg_temp = NCT6775_REG_TEMP;
> reg_temp_mon = NCT6775_REG_TEMP_MON;
> num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
> num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6776_REG_TSI_TEMP);
> reg_temp_over = NCT6775_REG_TEMP_OVER;
> reg_temp_hyst = NCT6775_REG_TEMP_HYST;
> reg_temp_config = NCT6776_REG_TEMP_CONFIG;
> @@ -4341,11 +4420,13 @@ static int nct6775_probe(struct platform_device *pdev)
> data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
> data->REG_ALARM = NCT6779_REG_ALARM;
> data->REG_BEEP = NCT6776_REG_BEEP;
> + data->REG_TSI_TEMP = NCT6776_REG_TSI_TEMP;
>
> reg_temp = NCT6779_REG_TEMP;
> reg_temp_mon = NCT6779_REG_TEMP_MON;
> num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
> num_reg_temp_mon = ARRAY_SIZE(NCT6779_REG_TEMP_MON);
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6776_REG_TSI_TEMP);
> reg_temp_over = NCT6779_REG_TEMP_OVER;
> reg_temp_hyst = NCT6779_REG_TEMP_HYST;
> reg_temp_config = NCT6779_REG_TEMP_CONFIG;
> @@ -4460,6 +4541,24 @@ static int nct6775_probe(struct platform_device *pdev)
> data->REG_BEEP = NCT6776_REG_BEEP;
> else
> data->REG_BEEP = NCT6792_REG_BEEP;
> + switch (data->kind) {
> + case nct6791:
> + case nct6792:
> + case nct6793:
> + data->REG_TSI_TEMP = NCT6776_REG_TSI_TEMP;
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6776_REG_TSI_TEMP);
> + break;
> + case nct6795:
> + case nct6796:
> + case nct6797:
> + case nct6798:
> + data->REG_TSI_TEMP = NCT6796_REG_TSI_TEMP;
> + num_reg_tsi_temp = ARRAY_SIZE(NCT6796_REG_TSI_TEMP);
> + break;
> + default:
> + num_reg_tsi_temp = 0;
> + break;
> + }
>
> reg_temp = NCT6779_REG_TEMP;
> num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
> @@ -4659,6 +4758,12 @@ static int nct6775_probe(struct platform_device *pdev)
> }
> #endif /* USE_ALTERNATE */
>
> + /* Check which TSIx_TEMP registers are active */
> + for (i = 0; i < num_reg_tsi_temp; i++) {
> + if (data->read_value(data, data->REG_TSI_TEMP[i]))
> + data->have_tsi_temp |= BIT(i);
> + }
> +
> /* Initialize the chip */
> nct6775_init_device(data);
>
> @@ -4766,6 +4871,18 @@ static int nct6775_probe(struct platform_device *pdev)
> return PTR_ERR(group);
>
> data->groups[num_attr_groups++] = group;
> +
> + if (data->have_tsi_temp) {
> + tsi_temp_tg.templates = nct6775_tsi_temp_template;
> + tsi_temp_tg.is_visible = nct6775_tsi_temp_is_visible;
> + tsi_temp_tg.base = fls(data->have_temp) + 1;
> + group = nct6775_create_attr_group(dev, &tsi_temp_tg, fls(data->have_tsi_temp));
> + if (IS_ERR(group))
> + return PTR_ERR(group);
> +
> + data->groups[num_attr_groups++] = group;
> + }
> +
> data->groups[num_attr_groups++] = &nct6775_group_other;
>
> hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,

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In reply to: Zev Weiss: "[PATCH v4] hwmon: (nct6775) add support for TSI temperature registers"
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