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hwmon: (gsc-hwmon) add fan sensor 

Add a fan sensor to report RPM's from a fan tach input.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Tim Harvey 2020-08-27 13:04:54 -07:00 committed by Guenter Roeck
parent d6144a4004
commit 7497d4a66c
2 changed files with 30 additions and 3 deletions
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32
drivers/hwmon/gsc-hwmon.c
View File

@ -17,6 +17,7 @@
#define GSC_HWMON_MAX_TEMP_CH 16
#define GSC_HWMON_MAX_IN_CH 16
#define GSC_HWMON_MAX_FAN_CH 16
#define GSC_HWMON_RESOLUTION 12
#define GSC_HWMON_VREF 2500
@ -27,11 +28,14 @@ struct gsc_hwmon_data {
struct regmap *regmap;
const struct gsc_hwmon_channel *temp_ch[GSC_HWMON_MAX_TEMP_CH];
const struct gsc_hwmon_channel *in_ch[GSC_HWMON_MAX_IN_CH];
const struct gsc_hwmon_channel *fan_ch[GSC_HWMON_MAX_FAN_CH];
u32 temp_config[GSC_HWMON_MAX_TEMP_CH + 1];
u32 in_config[GSC_HWMON_MAX_IN_CH + 1];
u32 fan_config[GSC_HWMON_MAX_FAN_CH + 1];
struct hwmon_channel_info temp_info;
struct hwmon_channel_info in_info;
const struct hwmon_channel_info *info[3];
struct hwmon_channel_info fan_info;
const struct hwmon_channel_info *info[4];
struct hwmon_chip_info chip;
};
@ -155,6 +159,9 @@ gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
case hwmon_temp:
ch = hwmon->temp_ch[channel];
break;
case hwmon_fan:
ch = hwmon->fan_ch[channel];
break;
default:
return -EOPNOTSUPP;
}
@ -187,6 +194,9 @@ gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
/* adjust by uV offset */
tmp += ch->mvoffset;
break;
case mode_fan:
tmp *= 30; /* convert to revolutions per minute */
break;
case mode_voltage_24bit:
case mode_voltage_16bit:
/* no adjustment needed */
@ -211,6 +221,9 @@ gsc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
case hwmon_temp:
*buf = hwmon->temp_ch[channel]->name;
break;
case hwmon_fan:
*buf = hwmon->fan_ch[channel]->name;
break;
default:
return -ENOTSUPP;
}
@ -304,7 +317,7 @@ static int gsc_hwmon_probe(struct platform_device *pdev)
struct gsc_hwmon_platform_data *pdata = dev_get_platdata(dev);
struct gsc_hwmon_data *hwmon;
const struct attribute_group **groups;
int i, i_in, i_temp;
int i, i_in, i_temp, i_fan;
if (!pdata) {
pdata = gsc_hwmon_get_devtree_pdata(dev);
@ -324,7 +337,7 @@ static int gsc_hwmon_probe(struct platform_device *pdev)
if (IS_ERR(hwmon->regmap))
return PTR_ERR(hwmon->regmap);
for (i = 0, i_in = 0, i_temp = 0; i < hwmon->pdata->nchannels; i++) {
for (i = 0, i_in = 0, i_temp = 0, i_fan = 0; i < hwmon->pdata->nchannels; i++) {
const struct gsc_hwmon_channel *ch = &pdata->channels[i];
switch (ch->mode) {
@ -338,6 +351,16 @@ static int gsc_hwmon_probe(struct platform_device *pdev)
HWMON_T_LABEL;
i_temp++;
break;
case mode_fan:
if (i_fan == GSC_HWMON_MAX_FAN_CH) {
dev_err(gsc->dev, "too many fan channels\n");
return -EINVAL;
}
hwmon->fan_ch[i_fan] = ch;
hwmon->fan_config[i_fan] = HWMON_F_INPUT |
HWMON_F_LABEL;
i_fan++;
break;
case mode_voltage_24bit:
case mode_voltage_16bit:
case mode_voltage_raw:
@ -361,10 +384,13 @@ static int gsc_hwmon_probe(struct platform_device *pdev)
hwmon->chip.info = hwmon->info;
hwmon->info[0] = &hwmon->temp_info;
hwmon->info[1] = &hwmon->in_info;
hwmon->info[2] = &hwmon->fan_info;
hwmon->temp_info.type = hwmon_temp;
hwmon->temp_info.config = hwmon->temp_config;
hwmon->in_info.type = hwmon_in;
hwmon->in_info.config = hwmon->in_config;
hwmon->fan_info.type = hwmon_fan;
hwmon->fan_info.config = hwmon->fan_config;
groups = pdata->fan_base ? gsc_hwmon_groups : NULL;
hwmon_dev = devm_hwmon_device_register_with_info(dev,

1
include/linux/platform_data/gsc_hwmon.h
View File

@ -7,6 +7,7 @@ enum gsc_hwmon_mode {
mode_voltage_24bit,
mode_voltage_raw,
mode_voltage_16bit,
mode_fan,
mode_max,
};