422 lines
11 KiB
C
422 lines
11 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Driver for Gateworks System Controller Hardware Monitor module
|
||
|
|
*
|
||
|
|
* Copyright (C) 2020 Gateworks Corporation
|
||
|
|
*/
|
||
|
|
#include <linux/hwmon.h>
|
||
|
|
#include <linux/hwmon-sysfs.h>
|
||
|
|
#include <linux/mfd/gsc.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/regmap.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
#include <linux/platform_data/gsc_hwmon.h>
|
||
|
|
|
||
|
|
#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
|
||
|
|
|
||
|
|
struct gsc_hwmon_data {
|
||
|
|
struct gsc_dev *gsc;
|
||
|
|
struct gsc_hwmon_platform_data *pdata;
|
||
|
|
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;
|
||
|
|
struct hwmon_channel_info fan_info;
|
||
|
|
const struct hwmon_channel_info *info[4];
|
||
|
|
struct hwmon_chip_info chip;
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct regmap_bus gsc_hwmon_regmap_bus = {
|
||
|
|
.reg_read = gsc_read,
|
||
|
|
.reg_write = gsc_write,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct regmap_config gsc_hwmon_regmap_config = {
|
||
|
|
.reg_bits = 8,
|
||
|
|
.val_bits = 8,
|
||
|
|
.cache_type = REGCACHE_NONE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static ssize_t pwm_auto_point_temp_show(struct device *dev,
|
||
|
|
struct device_attribute *devattr,
|
||
|
|
char *buf)
|
||
|
|
{
|
||
|
|
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
|
||
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
||
|
|
u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
|
||
|
|
u8 regs[2];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = regmap_bulk_read(hwmon->regmap, reg, regs, 2);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = regs[0] | regs[1] << 8;
|
||
|
|
return sprintf(buf, "%d\n", ret * 10);
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t pwm_auto_point_temp_store(struct device *dev,
|
||
|
|
struct device_attribute *devattr,
|
||
|
|
const char *buf, size_t count)
|
||
|
|
{
|
||
|
|
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
|
||
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
||
|
|
u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
|
||
|
|
u8 regs[2];
|
||
|
|
long temp;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
if (kstrtol(buf, 10, &temp))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
temp = clamp_val(temp, 0, 10000);
|
||
|
|
temp = DIV_ROUND_CLOSEST(temp, 10);
|
||
|
|
|
||
|
|
regs[0] = temp & 0xff;
|
||
|
|
regs[1] = (temp >> 8) & 0xff;
|
||
|
|
err = regmap_bulk_write(hwmon->regmap, reg, regs, 2);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t pwm_auto_point_pwm_show(struct device *dev,
|
||
|
|
struct device_attribute *devattr,
|
||
|
|
char *buf)
|
||
|
|
{
|
||
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
||
|
|
|
||
|
|
return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)) / 100);
|
||
|
|
}
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm_auto_point_pwm, 0);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_auto_point_temp, 0);
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_pwm, pwm_auto_point_pwm, 1);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, pwm_auto_point_temp, 1);
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm_auto_point_pwm, 2);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, pwm_auto_point_temp, 2);
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point4_pwm, pwm_auto_point_pwm, 3);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, pwm_auto_point_temp, 3);
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm_auto_point_pwm, 4);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point5_temp, pwm_auto_point_temp, 4);
|
||
|
|
|
||
|
|
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point6_pwm, pwm_auto_point_pwm, 5);
|
||
|
|
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point6_temp, pwm_auto_point_temp, 5);
|
||
|
|
|
||
|
|
static struct attribute *gsc_hwmon_attributes[] = {
|
||
|
|
&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
|
||
|
|
&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct attribute_group gsc_hwmon_group = {
|
||
|
|
.attrs = gsc_hwmon_attributes,
|
||
|
|
};
|
||
|
|
__ATTRIBUTE_GROUPS(gsc_hwmon);
|
||
|
|
|
||
|
|
static int
|
||
|
|
gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
|
||
|
|
int channel, long *val)
|
||
|
|
{
|
||
|
|
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
|
||
|
|
const struct gsc_hwmon_channel *ch;
|
||
|
|
int sz, ret;
|
||
|
|
long tmp;
|
||
|
|
u8 buf[3];
|
||
|
|
|
||
|
|
switch (type) {
|
||
|
|
case hwmon_in:
|
||
|
|
ch = hwmon->in_ch[channel];
|
||
|
|
break;
|
||
|
|
case hwmon_temp:
|
||
|
|
ch = hwmon->temp_ch[channel];
|
||
|
|
break;
|
||
|
|
case hwmon_fan:
|
||
|
|
ch = hwmon->fan_ch[channel];
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
|
||
|
|
sz = (ch->mode == mode_voltage_24bit) ? 3 : 2;
|
||
|
|
ret = regmap_bulk_read(hwmon->regmap, ch->reg, buf, sz);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
tmp = 0;
|
||
|
|
while (sz-- > 0)
|
||
|
|
tmp |= (buf[sz] << (8 * sz));
|
||
|
|
|
||
|
|
switch (ch->mode) {
|
||
|
|
case mode_temperature:
|
||
|
|
if (tmp > 0x8000)
|
||
|
|
tmp -= 0xffff;
|
||
|
|
tmp *= 100; /* convert to millidegrees celsius */
|
||
|
|
break;
|
||
|
|
case mode_voltage_raw:
|
||
|
|
tmp = clamp_val(tmp, 0, BIT(GSC_HWMON_RESOLUTION));
|
||
|
|
/* scale based on ref voltage and ADC resolution */
|
||
|
|
tmp *= GSC_HWMON_VREF;
|
||
|
|
tmp >>= GSC_HWMON_RESOLUTION;
|
||
|
|
/* scale based on optional voltage divider */
|
||
|
|
if (ch->vdiv[0] && ch->vdiv[1]) {
|
||
|
|
tmp *= (ch->vdiv[0] + ch->vdiv[1]);
|
||
|
|
tmp /= ch->vdiv[1];
|
||
|
|
}
|
||
|
|
/* 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 */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
*val = tmp;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
gsc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
|
||
|
|
u32 attr, int channel, const char **buf)
|
||
|
|
{
|
||
|
|
struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
switch (type) {
|
||
|
|
case hwmon_in:
|
||
|
|
*buf = hwmon->in_ch[channel]->name;
|
||
|
|
break;
|
||
|
|
case hwmon_temp:
|
||
|
|
*buf = hwmon->temp_ch[channel]->name;
|
||
|
|
break;
|
||
|
|
case hwmon_fan:
|
||
|
|
*buf = hwmon->fan_ch[channel]->name;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -ENOTSUPP;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static umode_t
|
||
|
|
gsc_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
|
||
|
|
int ch)
|
||
|
|
{
|
||
|
|
return 0444;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct hwmon_ops gsc_hwmon_ops = {
|
||
|
|
.is_visible = gsc_hwmon_is_visible,
|
||
|
|
.read = gsc_hwmon_read,
|
||
|
|
.read_string = gsc_hwmon_read_string,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct gsc_hwmon_platform_data *
|
||
|
|
gsc_hwmon_get_devtree_pdata(struct device *dev)
|
||
|
|
{
|
||
|
|
struct gsc_hwmon_platform_data *pdata;
|
||
|
|
struct gsc_hwmon_channel *ch;
|
||
|
|
struct fwnode_handle *child;
|
||
|
|
struct device_node *fan;
|
||
|
|
int nchannels;
|
||
|
|
|
||
|
|
nchannels = device_get_child_node_count(dev);
|
||
|
|
if (nchannels == 0)
|
||
|
|
return ERR_PTR(-ENODEV);
|
||
|
|
|
||
|
|
pdata = devm_kzalloc(dev, struct_size(pdata, channels, nchannels),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!pdata)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
pdata->nchannels = nchannels;
|
||
|
|
|
||
|
|
/* fan controller base address */
|
||
|
|
of_node_get(dev->parent->of_node);
|
||
|
|
fan = of_find_compatible_node(dev->parent->of_node, NULL, "gw,gsc-fan");
|
||
|
|
if (fan && of_property_read_u32(fan, "reg", &pdata->fan_base)) {
|
||
|
|
of_node_put(fan);
|
||
|
|
dev_err(dev, "fan node without base\n");
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
}
|
||
|
|
|
||
|
|
of_node_put(fan);
|
||
|
|
|
||
|
|
ch = pdata->channels;
|
||
|
|
/* allocate structures for channels and count instances of each type */
|
||
|
|
device_for_each_child_node(dev, child) {
|
||
|
|
if (fwnode_property_read_string(child, "label", &ch->name)) {
|
||
|
|
dev_err(dev, "channel without label\n");
|
||
|
|
fwnode_handle_put(child);
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
}
|
||
|
|
if (fwnode_property_read_u32(child, "reg", &ch->reg)) {
|
||
|
|
dev_err(dev, "channel without reg\n");
|
||
|
|
fwnode_handle_put(child);
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
}
|
||
|
|
if (fwnode_property_read_u32(child, "gw,mode", &ch->mode)) {
|
||
|
|
dev_err(dev, "channel without mode\n");
|
||
|
|
fwnode_handle_put(child);
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
}
|
||
|
|
if (ch->mode > mode_max) {
|
||
|
|
dev_err(dev, "invalid channel mode\n");
|
||
|
|
fwnode_handle_put(child);
|
||
|
|
return ERR_PTR(-EINVAL);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!fwnode_property_read_u32(child,
|
||
|
|
"gw,voltage-offset-microvolt",
|
||
|
|
&ch->mvoffset))
|
||
|
|
ch->mvoffset /= 1000;
|
||
|
|
fwnode_property_read_u32_array(child,
|
||
|
|
"gw,voltage-divider-ohms",
|
||
|
|
ch->vdiv, ARRAY_SIZE(ch->vdiv));
|
||
|
|
ch++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return pdata;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int gsc_hwmon_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct gsc_dev *gsc = dev_get_drvdata(pdev->dev.parent);
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct device *hwmon_dev;
|
||
|
|
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, i_fan;
|
||
|
|
|
||
|
|
if (!pdata) {
|
||
|
|
pdata = gsc_hwmon_get_devtree_pdata(dev);
|
||
|
|
if (IS_ERR(pdata))
|
||
|
|
return PTR_ERR(pdata);
|
||
|
|
}
|
||
|
|
|
||
|
|
hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
|
||
|
|
if (!hwmon)
|
||
|
|
return -ENOMEM;
|
||
|
|
hwmon->gsc = gsc;
|
||
|
|
hwmon->pdata = pdata;
|
||
|
|
|
||
|
|
hwmon->regmap = devm_regmap_init(dev, &gsc_hwmon_regmap_bus,
|
||
|
|
gsc->i2c_hwmon,
|
||
|
|
&gsc_hwmon_regmap_config);
|
||
|
|
if (IS_ERR(hwmon->regmap))
|
||
|
|
return PTR_ERR(hwmon->regmap);
|
||
|
|
|
||
|
|
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) {
|
||
|
|
case mode_temperature:
|
||
|
|
if (i_temp == GSC_HWMON_MAX_TEMP_CH) {
|
||
|
|
dev_err(gsc->dev, "too many temp channels\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
hwmon->temp_ch[i_temp] = ch;
|
||
|
|
hwmon->temp_config[i_temp] = HWMON_T_INPUT |
|
||
|
|
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:
|
||
|
|
if (i_in == GSC_HWMON_MAX_IN_CH) {
|
||
|
|
dev_err(gsc->dev, "too many input channels\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
hwmon->in_ch[i_in] = ch;
|
||
|
|
hwmon->in_config[i_in] =
|
||
|
|
HWMON_I_INPUT | HWMON_I_LABEL;
|
||
|
|
i_in++;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
dev_err(gsc->dev, "invalid mode: %d\n", ch->mode);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* setup config structures */
|
||
|
|
hwmon->chip.ops = &gsc_hwmon_ops;
|
||
|
|
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,
|
||
|
|
KBUILD_MODNAME, hwmon,
|
||
|
|
&hwmon->chip, groups);
|
||
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id gsc_hwmon_of_match[] = {
|
||
|
|
{ .compatible = "gw,gsc-adc", },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct platform_driver gsc_hwmon_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "gsc-hwmon",
|
||
|
|
.of_match_table = gsc_hwmon_of_match,
|
||
|
|
},
|
||
|
|
.probe = gsc_hwmon_probe,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(gsc_hwmon_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
|
||
|
|
MODULE_DESCRIPTION("GSC hardware monitor driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|