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hwmon: (pmbus) Introduce PMBUS_VIRT_*_SAMPLES registers

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Those virtual registers can be used to export manufacturer specific
functionality for controlling the number of samples for average values
reported by the device.

Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Adamski, Krzysztof (Nokia - PL/Wroclaw) 2019-04-14 21:58:18 +00:00 committed by Guenter Roeck
parent 8e742fc2e2
commit 49c4455dcc
2 changed files with 125 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/hwmon/pmbus/pmbus.h
View file

@ -217,6 +217,20 @@ enum pmbus_regs {
PMBUS_VIRT_PWM_ENABLE_2,
PMBUS_VIRT_PWM_ENABLE_3,
PMBUS_VIRT_PWM_ENABLE_4,
/* Samples for average
*
* Drivers wanting to expose functionality for changing the number of
* samples used for average values should implement support in
* {read,write}_word_data callback for either PMBUS_VIRT_SAMPLES if it
* applies to all types of measurements, or any number of specific
* PMBUS_VIRT_*_SAMPLES registers to allow for individual control.
*/
PMBUS_VIRT_SAMPLES,
PMBUS_VIRT_IN_SAMPLES,
PMBUS_VIRT_CURR_SAMPLES,
PMBUS_VIRT_POWER_SAMPLES,
PMBUS_VIRT_TEMP_SAMPLES,
};
/*
@ -371,6 +385,7 @@ enum pmbus_sensor_classes {
#define PMBUS_HAVE_STATUS_VMON BIT(19)
#define PMBUS_HAVE_PWM12 BIT(20)
#define PMBUS_HAVE_PWM34 BIT(21)
#define PMBUS_HAVE_SAMPLES BIT(22)
#define PMBUS_PAGE_VIRTUAL BIT(31)

110
drivers/hwmon/pmbus/pmbus_core.c
View file

@ -1901,6 +1901,112 @@ static int pmbus_add_fan_attributes(struct i2c_client *client,
return 0;
}
struct pmbus_samples_attr {
int reg;
char *name;
};
struct pmbus_samples_reg {
int page;
struct pmbus_samples_attr *attr;
struct device_attribute dev_attr;
};
static struct pmbus_samples_attr pmbus_samples_registers[] = {
{
.reg = PMBUS_VIRT_SAMPLES,
.name = "samples",
}, {
.reg = PMBUS_VIRT_IN_SAMPLES,
.name = "in_samples",
}, {
.reg = PMBUS_VIRT_CURR_SAMPLES,
.name = "curr_samples",
}, {
.reg = PMBUS_VIRT_POWER_SAMPLES,
.name = "power_samples",
}, {
.reg = PMBUS_VIRT_TEMP_SAMPLES,
.name = "temp_samples",
}
};
#define to_samples_reg(x) container_of(x, struct pmbus_samples_reg, dev_attr)
static ssize_t pmbus_show_samples(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int val;
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_samples_reg *reg = to_samples_reg(devattr);
val = _pmbus_read_word_data(client, reg->page, reg->attr->reg);
if (val < 0)
return val;
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t pmbus_set_samples(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
int ret;
long val;
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_samples_reg *reg = to_samples_reg(devattr);
if (kstrtol(buf, 0, &val) < 0)
return -EINVAL;
ret = _pmbus_write_word_data(client, reg->page, reg->attr->reg, val);
return ret ? : count;
}
static int pmbus_add_samples_attr(struct pmbus_data *data, int page,
struct pmbus_samples_attr *attr)
{
struct pmbus_samples_reg *reg;
reg = devm_kzalloc(data->dev, sizeof(*reg), GFP_KERNEL);
if (!reg)
return -ENOMEM;
reg->attr = attr;
reg->page = page;
pmbus_dev_attr_init(&reg->dev_attr, attr->name, 0644,
pmbus_show_samples, pmbus_set_samples);
return pmbus_add_attribute(data, &reg->dev_attr.attr);
}
static int pmbus_add_samples_attributes(struct i2c_client *client,
struct pmbus_data *data)
{
const struct pmbus_driver_info *info = data->info;
int s;
if (!(info->func[0] & PMBUS_HAVE_SAMPLES))
return 0;
for (s = 0; s < ARRAY_SIZE(pmbus_samples_registers); s++) {
struct pmbus_samples_attr *attr;
int ret;
attr = &pmbus_samples_registers[s];
if (!pmbus_check_word_register(client, 0, attr->reg))
continue;
ret = pmbus_add_samples_attr(data, 0, attr);
if (ret)
return ret;
}
return 0;
}
static int pmbus_find_attributes(struct i2c_client *client,
struct pmbus_data *data)
{
@ -1932,6 +2038,10 @@ static int pmbus_find_attributes(struct i2c_client *client,
/* Fans */
ret = pmbus_add_fan_attributes(client, data);
if (ret)
return ret;
ret = pmbus_add_samples_attributes(client, data);
return ret;
}