391 lines
10 KiB
C
391 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for Gateworks System Controller Hardware Monitor module
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*
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* Copyright (C) 2020 Gateworks Corporation
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*/
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/mfd/gsc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/platform_data/gsc_hwmon.h>
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#define GSC_HWMON_MAX_TEMP_CH 16
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#define GSC_HWMON_MAX_IN_CH 16
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#define GSC_HWMON_RESOLUTION 12
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#define GSC_HWMON_VREF 2500
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struct gsc_hwmon_data {
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struct gsc_dev *gsc;
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struct gsc_hwmon_platform_data *pdata;
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struct regmap *regmap;
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const struct gsc_hwmon_channel *temp_ch[GSC_HWMON_MAX_TEMP_CH];
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const struct gsc_hwmon_channel *in_ch[GSC_HWMON_MAX_IN_CH];
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u32 temp_config[GSC_HWMON_MAX_TEMP_CH + 1];
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u32 in_config[GSC_HWMON_MAX_IN_CH + 1];
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struct hwmon_channel_info temp_info;
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struct hwmon_channel_info in_info;
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const struct hwmon_channel_info *info[3];
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struct hwmon_chip_info chip;
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};
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static struct regmap_bus gsc_hwmon_regmap_bus = {
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.reg_read = gsc_read,
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.reg_write = gsc_write,
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};
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static const struct regmap_config gsc_hwmon_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.cache_type = REGCACHE_NONE,
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};
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static ssize_t pwm_auto_point_temp_show(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
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u8 regs[2];
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int ret;
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ret = regmap_bulk_read(hwmon->regmap, reg, regs, 2);
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if (ret)
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return ret;
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ret = regs[0] | regs[1] << 8;
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return sprintf(buf, "%d\n", ret * 10);
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}
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static ssize_t pwm_auto_point_temp_store(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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u8 reg = hwmon->pdata->fan_base + (2 * attr->index);
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u8 regs[2];
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long temp;
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int err;
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if (kstrtol(buf, 10, &temp))
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return -EINVAL;
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temp = clamp_val(temp, 0, 10000);
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temp = DIV_ROUND_CLOSEST(temp, 10);
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regs[0] = temp & 0xff;
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regs[1] = (temp >> 8) & 0xff;
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err = regmap_bulk_write(hwmon->regmap, reg, regs, 2);
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if (err)
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return err;
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return count;
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}
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static ssize_t pwm_auto_point_pwm_show(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)) / 100);
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}
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm_auto_point_pwm, 0);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_auto_point_temp, 0);
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_pwm, pwm_auto_point_pwm, 1);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_temp, pwm_auto_point_temp, 1);
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm_auto_point_pwm, 2);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_temp, pwm_auto_point_temp, 2);
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point4_pwm, pwm_auto_point_pwm, 3);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_temp, pwm_auto_point_temp, 3);
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm_auto_point_pwm, 4);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point5_temp, pwm_auto_point_temp, 4);
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static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point6_pwm, pwm_auto_point_pwm, 5);
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static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point6_temp, pwm_auto_point_temp, 5);
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static struct attribute *gsc_hwmon_attributes[] = {
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&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point6_pwm.dev_attr.attr,
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&sensor_dev_attr_pwm1_auto_point6_temp.dev_attr.attr,
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NULL
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};
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static const struct attribute_group gsc_hwmon_group = {
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.attrs = gsc_hwmon_attributes,
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};
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__ATTRIBUTE_GROUPS(gsc_hwmon);
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static int
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gsc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
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const struct gsc_hwmon_channel *ch;
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int sz, ret;
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long tmp;
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u8 buf[3];
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switch (type) {
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case hwmon_in:
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ch = hwmon->in_ch[channel];
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break;
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case hwmon_temp:
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ch = hwmon->temp_ch[channel];
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break;
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default:
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return -EOPNOTSUPP;
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}
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sz = (ch->mode == mode_voltage) ? 3 : 2;
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ret = regmap_bulk_read(hwmon->regmap, ch->reg, buf, sz);
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if (ret)
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return ret;
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tmp = 0;
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while (sz-- > 0)
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tmp |= (buf[sz] << (8 * sz));
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switch (ch->mode) {
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case mode_temperature:
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if (tmp > 0x8000)
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tmp -= 0xffff;
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break;
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case mode_voltage_raw:
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tmp = clamp_val(tmp, 0, BIT(GSC_HWMON_RESOLUTION));
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/* scale based on ref voltage and ADC resolution */
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tmp *= GSC_HWMON_VREF;
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tmp >>= GSC_HWMON_RESOLUTION;
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/* scale based on optional voltage divider */
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if (ch->vdiv[0] && ch->vdiv[1]) {
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tmp *= (ch->vdiv[0] + ch->vdiv[1]);
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tmp /= ch->vdiv[1];
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}
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/* adjust by uV offset */
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tmp += ch->mvoffset;
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break;
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case mode_voltage:
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/* no adjustment needed */
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break;
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}
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*val = tmp;
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return 0;
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}
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static int
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gsc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, const char **buf)
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{
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struct gsc_hwmon_data *hwmon = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_in:
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*buf = hwmon->in_ch[channel]->name;
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break;
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case hwmon_temp:
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*buf = hwmon->temp_ch[channel]->name;
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break;
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default:
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return -ENOTSUPP;
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}
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return 0;
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}
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static umode_t
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gsc_hwmon_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr,
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int ch)
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{
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return 0444;
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}
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static const struct hwmon_ops gsc_hwmon_ops = {
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.is_visible = gsc_hwmon_is_visible,
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.read = gsc_hwmon_read,
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.read_string = gsc_hwmon_read_string,
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};
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static struct gsc_hwmon_platform_data *
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gsc_hwmon_get_devtree_pdata(struct device *dev)
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{
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struct gsc_hwmon_platform_data *pdata;
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struct gsc_hwmon_channel *ch;
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struct fwnode_handle *child;
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struct device_node *fan;
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int nchannels;
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nchannels = device_get_child_node_count(dev);
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if (nchannels == 0)
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return ERR_PTR(-ENODEV);
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pdata = devm_kzalloc(dev,
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sizeof(*pdata) + nchannels * sizeof(*ch),
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GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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ch = (struct gsc_hwmon_channel *)(pdata + 1);
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pdata->channels = ch;
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pdata->nchannels = nchannels;
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/* fan controller base address */
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fan = of_find_compatible_node(dev->parent->of_node, NULL, "gw,gsc-fan");
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if (fan && of_property_read_u32(fan, "reg", &pdata->fan_base)) {
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dev_err(dev, "fan node without base\n");
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return ERR_PTR(-EINVAL);
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}
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/* allocate structures for channels and count instances of each type */
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device_for_each_child_node(dev, child) {
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if (fwnode_property_read_string(child, "label", &ch->name)) {
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dev_err(dev, "channel without label\n");
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fwnode_handle_put(child);
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return ERR_PTR(-EINVAL);
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}
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if (fwnode_property_read_u32(child, "reg", &ch->reg)) {
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dev_err(dev, "channel without reg\n");
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fwnode_handle_put(child);
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return ERR_PTR(-EINVAL);
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}
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if (fwnode_property_read_u32(child, "gw,mode", &ch->mode)) {
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dev_err(dev, "channel without mode\n");
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fwnode_handle_put(child);
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return ERR_PTR(-EINVAL);
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}
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if (ch->mode > mode_max) {
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dev_err(dev, "invalid channel mode\n");
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fwnode_handle_put(child);
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return ERR_PTR(-EINVAL);
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}
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if (!fwnode_property_read_u32(child,
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"gw,voltage-offset-microvolt",
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&ch->mvoffset))
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ch->mvoffset /= 1000;
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fwnode_property_read_u32_array(child,
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"gw,voltage-divider-ohms",
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ch->vdiv, ARRAY_SIZE(ch->vdiv));
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ch++;
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}
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return pdata;
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}
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static int gsc_hwmon_probe(struct platform_device *pdev)
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{
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struct gsc_dev *gsc = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct device *hwmon_dev;
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struct gsc_hwmon_platform_data *pdata = dev_get_platdata(dev);
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struct gsc_hwmon_data *hwmon;
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const struct attribute_group **groups;
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int i, i_in, i_temp;
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if (!pdata) {
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pdata = gsc_hwmon_get_devtree_pdata(dev);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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}
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hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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hwmon->gsc = gsc;
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hwmon->pdata = pdata;
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hwmon->regmap = devm_regmap_init(dev, &gsc_hwmon_regmap_bus,
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gsc->i2c_hwmon,
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&gsc_hwmon_regmap_config);
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if (IS_ERR(hwmon->regmap))
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return PTR_ERR(hwmon->regmap);
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for (i = 0, i_in = 0, i_temp = 0; i < hwmon->pdata->nchannels; i++) {
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const struct gsc_hwmon_channel *ch = &pdata->channels[i];
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switch (ch->mode) {
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case mode_temperature:
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if (i_temp == GSC_HWMON_MAX_TEMP_CH) {
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dev_err(gsc->dev, "too many temp channels\n");
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return -EINVAL;
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}
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hwmon->temp_ch[i_temp] = ch;
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hwmon->temp_config[i_temp] = HWMON_T_INPUT |
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HWMON_T_LABEL;
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i_temp++;
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break;
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case mode_voltage:
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case mode_voltage_raw:
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if (i_in == GSC_HWMON_MAX_IN_CH) {
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dev_err(gsc->dev, "too many input channels\n");
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return -EINVAL;
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}
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hwmon->in_ch[i_in] = ch;
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hwmon->in_config[i_in] =
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HWMON_I_INPUT | HWMON_I_LABEL;
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i_in++;
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break;
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default:
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dev_err(gsc->dev, "invalid mode: %d\n", ch->mode);
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return -EINVAL;
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}
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}
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/* setup config structures */
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hwmon->chip.ops = &gsc_hwmon_ops;
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hwmon->chip.info = hwmon->info;
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hwmon->info[0] = &hwmon->temp_info;
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hwmon->info[1] = &hwmon->in_info;
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hwmon->temp_info.type = hwmon_temp;
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hwmon->temp_info.config = hwmon->temp_config;
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hwmon->in_info.type = hwmon_in;
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hwmon->in_info.config = hwmon->in_config;
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groups = pdata->fan_base ? gsc_hwmon_groups : NULL;
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hwmon_dev = devm_hwmon_device_register_with_info(dev,
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KBUILD_MODNAME, hwmon,
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&hwmon->chip, groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct of_device_id gsc_hwmon_of_match[] = {
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{ .compatible = "gw,gsc-adc", },
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{}
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};
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static struct platform_driver gsc_hwmon_driver = {
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.driver = {
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.name = "gsc-hwmon",
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.of_match_table = gsc_hwmon_of_match,
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},
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.probe = gsc_hwmon_probe,
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};
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module_platform_driver(gsc_hwmon_driver);
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MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
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MODULE_DESCRIPTION("GSC hardware monitor driver");
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MODULE_LICENSE("GPL v2");
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