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Diffstat (limited to '')
| -rw-r--r-- | drivers/hwmon/hwmon.c | 1192 |
1 files changed, 1192 insertions, 0 deletions
diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c new file mode 100644 index 000000000..9ed34b2e1 --- /dev/null +++ b/drivers/hwmon/hwmon.c @@ -0,0 +1,1192 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring + * + * This file defines the sysfs class "hwmon", for use by sensors drivers. + * + * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gfp.h> +#include <linux/hwmon.h> +#include <linux/idr.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/thermal.h> + +#define CREATE_TRACE_POINTS +#include <trace/events/hwmon.h> + +#define HWMON_ID_PREFIX "hwmon" +#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" + +struct hwmon_device { + const char *name; + const char *label; + struct device dev; + const struct hwmon_chip_info *chip; + struct list_head tzdata; + struct attribute_group group; + const struct attribute_group **groups; +}; + +#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev) + +#define MAX_SYSFS_ATTR_NAME_LENGTH 32 + +struct hwmon_device_attribute { + struct device_attribute dev_attr; + const struct hwmon_ops *ops; + enum hwmon_sensor_types type; + u32 attr; + int index; + char name[MAX_SYSFS_ATTR_NAME_LENGTH]; +}; + +#define to_hwmon_attr(d) \ + container_of(d, struct hwmon_device_attribute, dev_attr) +#define to_dev_attr(a) container_of(a, struct device_attribute, attr) + +/* + * Thermal zone information + */ +struct hwmon_thermal_data { + struct list_head node; /* hwmon tzdata list entry */ + struct device *dev; /* Reference to hwmon device */ + int index; /* sensor index */ + struct thermal_zone_device *tzd;/* thermal zone device */ +}; + +static ssize_t +name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", to_hwmon_device(dev)->name); +} +static DEVICE_ATTR_RO(name); + +static ssize_t +label_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label); +} +static DEVICE_ATTR_RO(label); + +static struct attribute *hwmon_dev_attrs[] = { + &dev_attr_name.attr, + &dev_attr_label.attr, + NULL +}; + +static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct hwmon_device *hdev = to_hwmon_device(dev); + + if (attr == &dev_attr_name.attr && hdev->name == NULL) + return 0; + + if (attr == &dev_attr_label.attr && hdev->label == NULL) + return 0; + + return attr->mode; +} + +static const struct attribute_group hwmon_dev_attr_group = { + .attrs = hwmon_dev_attrs, + .is_visible = hwmon_dev_attr_is_visible, +}; + +static const struct attribute_group *hwmon_dev_attr_groups[] = { + &hwmon_dev_attr_group, + NULL +}; + +static void hwmon_free_attrs(struct attribute **attrs) +{ + int i; + + for (i = 0; attrs[i]; i++) { + struct device_attribute *dattr = to_dev_attr(attrs[i]); + struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr); + + kfree(hattr); + } + kfree(attrs); +} + +static void hwmon_dev_release(struct device *dev) +{ + struct hwmon_device *hwdev = to_hwmon_device(dev); + + if (hwdev->group.attrs) + hwmon_free_attrs(hwdev->group.attrs); + kfree(hwdev->groups); + kfree(hwdev->label); + kfree(hwdev); +} + +static struct class hwmon_class = { + .name = "hwmon", + .owner = THIS_MODULE, + .dev_groups = hwmon_dev_attr_groups, + .dev_release = hwmon_dev_release, +}; + +static DEFINE_IDA(hwmon_ida); + +/* Thermal zone handling */ + +/* + * The complex conditional is necessary to avoid a cyclic dependency + * between hwmon and thermal_sys modules. + */ +#ifdef CONFIG_THERMAL_OF +static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp) +{ + struct hwmon_thermal_data *tdata = tz->devdata; + struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); + int ret; + long t; + + ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input, + tdata->index, &t); + if (ret < 0) + return ret; + + *temp = t; + + return 0; +} + +static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high) +{ + struct hwmon_thermal_data *tdata = tz->devdata; + struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); + const struct hwmon_chip_info *chip = hwdev->chip; + const struct hwmon_channel_info **info = chip->info; + unsigned int i; + int err; + + if (!chip->ops->write) + return 0; + + for (i = 0; info[i] && info[i]->type != hwmon_temp; i++) + continue; + + if (!info[i]) + return 0; + + if (info[i]->config[tdata->index] & HWMON_T_MIN) { + err = chip->ops->write(tdata->dev, hwmon_temp, + hwmon_temp_min, tdata->index, low); + if (err && err != -EOPNOTSUPP) + return err; + } + + if (info[i]->config[tdata->index] & HWMON_T_MAX) { + err = chip->ops->write(tdata->dev, hwmon_temp, + hwmon_temp_max, tdata->index, high); + if (err && err != -EOPNOTSUPP) + return err; + } + + return 0; +} + +static const struct thermal_zone_device_ops hwmon_thermal_ops = { + .get_temp = hwmon_thermal_get_temp, + .set_trips = hwmon_thermal_set_trips, +}; + +static void hwmon_thermal_remove_sensor(void *data) +{ + list_del(data); +} + +static int hwmon_thermal_add_sensor(struct device *dev, int index) +{ + struct hwmon_device *hwdev = to_hwmon_device(dev); + struct hwmon_thermal_data *tdata; + struct thermal_zone_device *tzd; + int err; + + tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL); + if (!tdata) + return -ENOMEM; + + tdata->dev = dev; + tdata->index = index; + + tzd = devm_thermal_of_zone_register(dev, index, tdata, + &hwmon_thermal_ops); + if (IS_ERR(tzd)) { + if (PTR_ERR(tzd) != -ENODEV) + return PTR_ERR(tzd); + dev_info(dev, "temp%d_input not attached to any thermal zone\n", + index + 1); + devm_kfree(dev, tdata); + return 0; + } + + err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node); + if (err) + return err; + + tdata->tzd = tzd; + list_add(&tdata->node, &hwdev->tzdata); + + return 0; +} + +static int hwmon_thermal_register_sensors(struct device *dev) +{ + struct hwmon_device *hwdev = to_hwmon_device(dev); + const struct hwmon_chip_info *chip = hwdev->chip; + const struct hwmon_channel_info **info = chip->info; + void *drvdata = dev_get_drvdata(dev); + int i; + + for (i = 1; info[i]; i++) { + int j; + + if (info[i]->type != hwmon_temp) + continue; + + for (j = 0; info[i]->config[j]; j++) { + int err; + + if (!(info[i]->config[j] & HWMON_T_INPUT) || + !chip->ops->is_visible(drvdata, hwmon_temp, + hwmon_temp_input, j)) + continue; + + err = hwmon_thermal_add_sensor(dev, j); + if (err) + return err; + } + } + + return 0; +} + +static void hwmon_thermal_notify(struct device *dev, int index) +{ + struct hwmon_device *hwdev = to_hwmon_device(dev); + struct hwmon_thermal_data *tzdata; + + list_for_each_entry(tzdata, &hwdev->tzdata, node) { + if (tzdata->index == index) { + thermal_zone_device_update(tzdata->tzd, + THERMAL_EVENT_UNSPECIFIED); + } + } +} + +#else +static int hwmon_thermal_register_sensors(struct device *dev) +{ + return 0; +} + +static void hwmon_thermal_notify(struct device *dev, int index) { } + +#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */ + +static int hwmon_attr_base(enum hwmon_sensor_types type) +{ + if (type == hwmon_in || type == hwmon_intrusion) + return 0; + return 1; +} + +/* sysfs attribute management */ + +static ssize_t hwmon_attr_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); + long val; + int ret; + + ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index, + &val); + if (ret < 0) + return ret; + + trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type), + hattr->name, val); + + return sprintf(buf, "%ld\n", val); +} + +static ssize_t hwmon_attr_show_string(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); + enum hwmon_sensor_types type = hattr->type; + const char *s; + int ret; + + ret = hattr->ops->read_string(dev, hattr->type, hattr->attr, + hattr->index, &s); + if (ret < 0) + return ret; + + trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type), + hattr->name, s); + + return sprintf(buf, "%s\n", s); +} + +static ssize_t hwmon_attr_store(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); + long val; + int ret; + + ret = kstrtol(buf, 10, &val); + if (ret < 0) + return ret; + + ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index, + val); + if (ret < 0) + return ret; + + trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type), + hattr->name, val); + + return count; +} + +static bool is_string_attr(enum hwmon_sensor_types type, u32 attr) +{ + return (type == hwmon_temp && attr == hwmon_temp_label) || + (type == hwmon_in && attr == hwmon_in_label) || + (type == hwmon_curr && attr == hwmon_curr_label) || + (type == hwmon_power && attr == hwmon_power_label) || + (type == hwmon_energy && attr == hwmon_energy_label) || + (type == hwmon_humidity && attr == hwmon_humidity_label) || + (type == hwmon_fan && attr == hwmon_fan_label); +} + +static struct attribute *hwmon_genattr(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, + int index, + const char *template, + const struct hwmon_ops *ops) +{ + struct hwmon_device_attribute *hattr; + struct device_attribute *dattr; + struct attribute *a; + umode_t mode; + const char *name; + bool is_string = is_string_attr(type, attr); + + /* The attribute is invisible if there is no template string */ + if (!template) + return ERR_PTR(-ENOENT); + + mode = ops->is_visible(drvdata, type, attr, index); + if (!mode) + return ERR_PTR(-ENOENT); + + if ((mode & 0444) && ((is_string && !ops->read_string) || + (!is_string && !ops->read))) + return ERR_PTR(-EINVAL); + if ((mode & 0222) && !ops->write) + return ERR_PTR(-EINVAL); + + hattr = kzalloc(sizeof(*hattr), GFP_KERNEL); + if (!hattr) + return ERR_PTR(-ENOMEM); + + if (type == hwmon_chip) { + name = template; + } else { + scnprintf(hattr->name, sizeof(hattr->name), template, + index + hwmon_attr_base(type)); + name = hattr->name; + } + + hattr->type = type; + hattr->attr = attr; + hattr->index = index; + hattr->ops = ops; + + dattr = &hattr->dev_attr; + dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show; + dattr->store = hwmon_attr_store; + + a = &dattr->attr; + sysfs_attr_init(a); + a->name = name; + a->mode = mode; + + return a; +} + +/* + * Chip attributes are not attribute templates but actual sysfs attributes. + * See hwmon_genattr() for special handling. + */ +static const char * const hwmon_chip_attrs[] = { + [hwmon_chip_temp_reset_history] = "temp_reset_history", + [hwmon_chip_in_reset_history] = "in_reset_history", + [hwmon_chip_curr_reset_history] = "curr_reset_history", + [hwmon_chip_power_reset_history] = "power_reset_history", + [hwmon_chip_update_interval] = "update_interval", + [hwmon_chip_alarms] = "alarms", + [hwmon_chip_samples] = "samples", + [hwmon_chip_curr_samples] = "curr_samples", + [hwmon_chip_in_samples] = "in_samples", + [hwmon_chip_power_samples] = "power_samples", + [hwmon_chip_temp_samples] = "temp_samples", +}; + +static const char * const hwmon_temp_attr_templates[] = { + [hwmon_temp_enable] = "temp%d_enable", + [hwmon_temp_input] = "temp%d_input", + [hwmon_temp_type] = "temp%d_type", + [hwmon_temp_lcrit] = "temp%d_lcrit", + [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst", + [hwmon_temp_min] = "temp%d_min", + [hwmon_temp_min_hyst] = "temp%d_min_hyst", + [hwmon_temp_max] = "temp%d_max", + [hwmon_temp_max_hyst] = "temp%d_max_hyst", + [hwmon_temp_crit] = "temp%d_crit", + [hwmon_temp_crit_hyst] = "temp%d_crit_hyst", + [hwmon_temp_emergency] = "temp%d_emergency", + [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst", + [hwmon_temp_alarm] = "temp%d_alarm", + [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm", + [hwmon_temp_min_alarm] = "temp%d_min_alarm", + [hwmon_temp_max_alarm] = "temp%d_max_alarm", + [hwmon_temp_crit_alarm] = "temp%d_crit_alarm", + [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm", + [hwmon_temp_fault] = "temp%d_fault", + [hwmon_temp_offset] = "temp%d_offset", + [hwmon_temp_label] = "temp%d_label", + [hwmon_temp_lowest] = "temp%d_lowest", + [hwmon_temp_highest] = "temp%d_highest", + [hwmon_temp_reset_history] = "temp%d_reset_history", + [hwmon_temp_rated_min] = "temp%d_rated_min", + [hwmon_temp_rated_max] = "temp%d_rated_max", +}; + +static const char * const hwmon_in_attr_templates[] = { + [hwmon_in_enable] = "in%d_enable", + [hwmon_in_input] = "in%d_input", + [hwmon_in_min] = "in%d_min", + [hwmon_in_max] = "in%d_max", + [hwmon_in_lcrit] = "in%d_lcrit", + [hwmon_in_crit] = "in%d_crit", + [hwmon_in_average] = "in%d_average", + [hwmon_in_lowest] = "in%d_lowest", + [hwmon_in_highest] = "in%d_highest", + [hwmon_in_reset_history] = "in%d_reset_history", + [hwmon_in_label] = "in%d_label", + [hwmon_in_alarm] = "in%d_alarm", + [hwmon_in_min_alarm] = "in%d_min_alarm", + [hwmon_in_max_alarm] = "in%d_max_alarm", + [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", + [hwmon_in_crit_alarm] = "in%d_crit_alarm", + [hwmon_in_rated_min] = "in%d_rated_min", + [hwmon_in_rated_max] = "in%d_rated_max", +}; + +static const char * const hwmon_curr_attr_templates[] = { + [hwmon_curr_enable] = "curr%d_enable", + [hwmon_curr_input] = "curr%d_input", + [hwmon_curr_min] = "curr%d_min", + [hwmon_curr_max] = "curr%d_max", + [hwmon_curr_lcrit] = "curr%d_lcrit", + [hwmon_curr_crit] = "curr%d_crit", + [hwmon_curr_average] = "curr%d_average", + [hwmon_curr_lowest] = "curr%d_lowest", + [hwmon_curr_highest] = "curr%d_highest", + [hwmon_curr_reset_history] = "curr%d_reset_history", + [hwmon_curr_label] = "curr%d_label", + [hwmon_curr_alarm] = "curr%d_alarm", + [hwmon_curr_min_alarm] = "curr%d_min_alarm", + [hwmon_curr_max_alarm] = "curr%d_max_alarm", + [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", + [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", + [hwmon_curr_rated_min] = "curr%d_rated_min", + [hwmon_curr_rated_max] = "curr%d_rated_max", +}; + +static const char * const hwmon_power_attr_templates[] = { + [hwmon_power_enable] = "power%d_enable", + [hwmon_power_average] = "power%d_average", + [hwmon_power_average_interval] = "power%d_average_interval", + [hwmon_power_average_interval_max] = "power%d_interval_max", + [hwmon_power_average_interval_min] = "power%d_interval_min", + [hwmon_power_average_highest] = "power%d_average_highest", + [hwmon_power_average_lowest] = "power%d_average_lowest", + [hwmon_power_average_max] = "power%d_average_max", + [hwmon_power_average_min] = "power%d_average_min", + [hwmon_power_input] = "power%d_input", + [hwmon_power_input_highest] = "power%d_input_highest", + [hwmon_power_input_lowest] = "power%d_input_lowest", + [hwmon_power_reset_history] = "power%d_reset_history", + [hwmon_power_accuracy] = "power%d_accuracy", + [hwmon_power_cap] = "power%d_cap", + [hwmon_power_cap_hyst] = "power%d_cap_hyst", + [hwmon_power_cap_max] = "power%d_cap_max", + [hwmon_power_cap_min] = "power%d_cap_min", + [hwmon_power_min] = "power%d_min", + [hwmon_power_max] = "power%d_max", + [hwmon_power_lcrit] = "power%d_lcrit", + [hwmon_power_crit] = "power%d_crit", + [hwmon_power_label] = "power%d_label", + [hwmon_power_alarm] = "power%d_alarm", + [hwmon_power_cap_alarm] = "power%d_cap_alarm", + [hwmon_power_min_alarm] = "power%d_min_alarm", + [hwmon_power_max_alarm] = "power%d_max_alarm", + [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm", + [hwmon_power_crit_alarm] = "power%d_crit_alarm", + [hwmon_power_rated_min] = "power%d_rated_min", + [hwmon_power_rated_max] = "power%d_rated_max", +}; + +static const char * const hwmon_energy_attr_templates[] = { + [hwmon_energy_enable] = "energy%d_enable", + [hwmon_energy_input] = "energy%d_input", + [hwmon_energy_label] = "energy%d_label", +}; + +static const char * const hwmon_humidity_attr_templates[] = { + [hwmon_humidity_enable] = "humidity%d_enable", + [hwmon_humidity_input] = "humidity%d_input", + [hwmon_humidity_label] = "humidity%d_label", + [hwmon_humidity_min] = "humidity%d_min", + [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", + [hwmon_humidity_max] = "humidity%d_max", + [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", + [hwmon_humidity_alarm] = "humidity%d_alarm", + [hwmon_humidity_fault] = "humidity%d_fault", + [hwmon_humidity_rated_min] = "humidity%d_rated_min", + [hwmon_humidity_rated_max] = "humidity%d_rated_max", +}; + +static const char * const hwmon_fan_attr_templates[] = { + [hwmon_fan_enable] = "fan%d_enable", + [hwmon_fan_input] = "fan%d_input", + [hwmon_fan_label] = "fan%d_label", + [hwmon_fan_min] = "fan%d_min", + [hwmon_fan_max] = "fan%d_max", + [hwmon_fan_div] = "fan%d_div", + [hwmon_fan_pulses] = "fan%d_pulses", + [hwmon_fan_target] = "fan%d_target", + [hwmon_fan_alarm] = "fan%d_alarm", + [hwmon_fan_min_alarm] = "fan%d_min_alarm", + [hwmon_fan_max_alarm] = "fan%d_max_alarm", + [hwmon_fan_fault] = "fan%d_fault", +}; + +static const char * const hwmon_pwm_attr_templates[] = { + [hwmon_pwm_input] = "pwm%d", + [hwmon_pwm_enable] = "pwm%d_enable", + [hwmon_pwm_mode] = "pwm%d_mode", + [hwmon_pwm_freq] = "pwm%d_freq", + [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp", +}; + +static const char * const hwmon_intrusion_attr_templates[] = { + [hwmon_intrusion_alarm] = "intrusion%d_alarm", + [hwmon_intrusion_beep] = "intrusion%d_beep", +}; + +static const char * const *__templates[] = { + [hwmon_chip] = hwmon_chip_attrs, + [hwmon_temp] = hwmon_temp_attr_templates, + [hwmon_in] = hwmon_in_attr_templates, + [hwmon_curr] = hwmon_curr_attr_templates, + [hwmon_power] = hwmon_power_attr_templates, + [hwmon_energy] = hwmon_energy_attr_templates, + [hwmon_humidity] = hwmon_humidity_attr_templates, + [hwmon_fan] = hwmon_fan_attr_templates, + [hwmon_pwm] = hwmon_pwm_attr_templates, + [hwmon_intrusion] = hwmon_intrusion_attr_templates, +}; + +static const int __templates_size[] = { + [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs), + [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), + [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), + [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), + [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), + [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), + [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), + [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), + [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), + [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates), +}; + +int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5]; + char sattr[MAX_SYSFS_ATTR_NAME_LENGTH]; + char *envp[] = { event, NULL }; + const char * const *templates; + const char *template; + int base; + + if (type >= ARRAY_SIZE(__templates)) + return -EINVAL; + if (attr >= __templates_size[type]) + return -EINVAL; + + templates = __templates[type]; + template = templates[attr]; + + base = hwmon_attr_base(type); + + scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel); + scnprintf(event, sizeof(event), "NAME=%s", sattr); + sysfs_notify(&dev->kobj, NULL, sattr); + kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); + + if (type == hwmon_temp) + hwmon_thermal_notify(dev, channel); + + return 0; +} +EXPORT_SYMBOL_GPL(hwmon_notify_event); + +static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) +{ + int i, n; + + for (i = n = 0; info->config[i]; i++) + n += hweight32(info->config[i]); + + return n; +} + +static int hwmon_genattrs(const void *drvdata, + struct attribute **attrs, + const struct hwmon_ops *ops, + const struct hwmon_channel_info *info) +{ + const char * const *templates; + int template_size; + int i, aindex = 0; + + if (info->type >= ARRAY_SIZE(__templates)) + return -EINVAL; + + templates = __templates[info->type]; + template_size = __templates_size[info->type]; + + for (i = 0; info->config[i]; i++) { + u32 attr_mask = info->config[i]; + u32 attr; + + while (attr_mask) { + struct attribute *a; + + attr = __ffs(attr_mask); + attr_mask &= ~BIT(attr); + if (attr >= template_size) + return -EINVAL; + a = hwmon_genattr(drvdata, info->type, attr, i, + templates[attr], ops); + if (IS_ERR(a)) { + if (PTR_ERR(a) != -ENOENT) + return PTR_ERR(a); + continue; + } + attrs[aindex++] = a; + } + } + return aindex; +} + +static struct attribute ** +__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) +{ + int ret, i, aindex = 0, nattrs = 0; + struct attribute **attrs; + + for (i = 0; chip->info[i]; i++) + nattrs += hwmon_num_channel_attrs(chip->info[i]); + + if (nattrs == 0) + return ERR_PTR(-EINVAL); + + attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL); + if (!attrs) + return ERR_PTR(-ENOMEM); + + for (i = 0; chip->info[i]; i++) { + ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, + chip->info[i]); + if (ret < 0) { + hwmon_free_attrs(attrs); + return ERR_PTR(ret); + } + aindex += ret; + } + + return attrs; +} + +static struct device * +__hwmon_device_register(struct device *dev, const char *name, void *drvdata, + const struct hwmon_chip_info *chip, + const struct attribute_group **groups) +{ + struct hwmon_device *hwdev; + const char *label; + struct device *hdev; + struct device *tdev = dev; + int i, err, id; + + /* Complain about invalid characters in hwmon name attribute */ + if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) + dev_warn(dev, + "hwmon: '%s' is not a valid name attribute, please fix\n", + name); + + id = ida_alloc(&hwmon_ida, GFP_KERNEL); + if (id < 0) + return ERR_PTR(id); + + hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL); + if (hwdev == NULL) { + err = -ENOMEM; + goto ida_remove; + } + + hdev = &hwdev->dev; + + if (chip) { + struct attribute **attrs; + int ngroups = 2; /* terminating NULL plus &hwdev->groups */ + + if (groups) + for (i = 0; groups[i]; i++) + ngroups++; + + hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL); + if (!hwdev->groups) { + err = -ENOMEM; + goto free_hwmon; + } + + attrs = __hwmon_create_attrs(drvdata, chip); + if (IS_ERR(attrs)) { + err = PTR_ERR(attrs); + goto free_hwmon; + } + + hwdev->group.attrs = attrs; + ngroups = 0; + hwdev->groups[ngroups++] = &hwdev->group; + + if (groups) { + for (i = 0; groups[i]; i++) + hwdev->groups[ngroups++] = groups[i]; + } + + hdev->groups = hwdev->groups; + } else { + hdev->groups = groups; + } + + if (dev && device_property_present(dev, "label")) { + err = device_property_read_string(dev, "label", &label); + if (err < 0) + goto free_hwmon; + + hwdev->label = kstrdup(label, GFP_KERNEL); + if (hwdev->label == NULL) { + err = -ENOMEM; + goto free_hwmon; + } + } + + hwdev->name = name; + hdev->class = &hwmon_class; + hdev->parent = dev; + while (tdev && !tdev->of_node) + tdev = tdev->parent; + hdev->of_node = tdev ? tdev->of_node : NULL; + hwdev->chip = chip; + dev_set_drvdata(hdev, drvdata); + dev_set_name(hdev, HWMON_ID_FORMAT, id); + err = device_register(hdev); + if (err) { + put_device(hdev); + goto ida_remove; + } + + INIT_LIST_HEAD(&hwdev->tzdata); + + if (hdev->of_node && chip && chip->ops->read && + chip->info[0]->type == hwmon_chip && + (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) { + err = hwmon_thermal_register_sensors(hdev); + if (err) { + device_unregister(hdev); + /* + * Don't worry about hwdev; hwmon_dev_release(), called + * from device_unregister(), will free it. + */ + goto ida_remove; + } + } + + return hdev; + +free_hwmon: + hwmon_dev_release(hdev); +ida_remove: + ida_free(&hwmon_ida, id); + return ERR_PTR(err); +} + +/** + * hwmon_device_register_with_groups - register w/ hwmon + * @dev: the parent device + * @name: hwmon name attribute + * @drvdata: driver data to attach to created device + * @groups: List of attribute groups to create + * + * hwmon_device_unregister() must be called when the device is no + * longer needed. + * + * Returns the pointer to the new device. + */ +struct device * +hwmon_device_register_with_groups(struct device *dev, const char *name, + void *drvdata, + const struct attribute_group **groups) +{ + if (!name) + return ERR_PTR(-EINVAL); + + return __hwmon_device_register(dev, name, drvdata, NULL, groups); +} +EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); + +/** + * hwmon_device_register_with_info - register w/ hwmon + * @dev: the parent device (mandatory) + * @name: hwmon name attribute (mandatory) + * @drvdata: driver data to attach to created device (optional) + * @chip: pointer to hwmon chip information (mandatory) + * @extra_groups: pointer to list of additional non-standard attribute groups + * (optional) + * + * hwmon_device_unregister() must be called when the device is no + * longer needed. + * + * Returns the pointer to the new device. + */ +struct device * +hwmon_device_register_with_info(struct device *dev, const char *name, + void *drvdata, + const struct hwmon_chip_info *chip, + const struct attribute_group **extra_groups) +{ + if (!dev || !name || !chip) + return ERR_PTR(-EINVAL); + + if (!chip->ops || !chip->ops->is_visible || !chip->info) + return ERR_PTR(-EINVAL); + + return __hwmon_device_register(dev, name, drvdata, chip, extra_groups); +} +EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); + +/** + * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem + * @dev: the parent device + * @name: hwmon name attribute + * @drvdata: driver data to attach to created device + * + * The use of this function is restricted. It is provided for legacy reasons + * and must only be called from the thermal subsystem. + * + * hwmon_device_unregister() must be called when the device is no + * longer needed. + * + * Returns the pointer to the new device. + */ +struct device * +hwmon_device_register_for_thermal(struct device *dev, const char *name, + void *drvdata) +{ + if (!name || !dev) + return ERR_PTR(-EINVAL); + + return __hwmon_device_register(dev, name, drvdata, NULL, NULL); +} +EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, HWMON_THERMAL); + +/** + * hwmon_device_register - register w/ hwmon + * @dev: the device to register + * + * hwmon_device_unregister() must be called when the device is no + * longer needed. + * + * Returns the pointer to the new device. + */ +struct device *hwmon_device_register(struct device *dev) +{ + dev_warn(dev, + "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n"); + + return __hwmon_device_register(dev, NULL, NULL, NULL, NULL); +} +EXPORT_SYMBOL_GPL(hwmon_device_register); + +/** + * hwmon_device_unregister - removes the previously registered class device + * + * @dev: the class device to destroy + */ +void hwmon_device_unregister(struct device *dev) +{ + int id; + + if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { + device_unregister(dev); + ida_free(&hwmon_ida, id); + } else + dev_dbg(dev->parent, + "hwmon_device_unregister() failed: bad class ID!\n"); +} +EXPORT_SYMBOL_GPL(hwmon_device_unregister); + +static void devm_hwmon_release(struct device *dev, void *res) +{ + struct device *hwdev = *(struct device **)res; + + hwmon_device_unregister(hwdev); +} + +/** + * devm_hwmon_device_register_with_groups - register w/ hwmon + * @dev: the parent device + * @name: hwmon name attribute + * @drvdata: driver data to attach to created device + * @groups: List of attribute groups to create + * + * Returns the pointer to the new device. The new device is automatically + * unregistered with the parent device. + */ +struct device * +devm_hwmon_device_register_with_groups(struct device *dev, const char *name, + void *drvdata, + const struct attribute_group **groups) +{ + struct device **ptr, *hwdev; + + if (!dev) + return ERR_PTR(-EINVAL); + + ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); + if (IS_ERR(hwdev)) + goto error; + + *ptr = hwdev; + devres_add(dev, ptr); + return hwdev; + +error: + devres_free(ptr); + return hwdev; +} +EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); + +/** + * devm_hwmon_device_register_with_info - register w/ hwmon + * @dev: the parent device + * @name: hwmon name attribute + * @drvdata: driver data to attach to created device + * @chip: pointer to hwmon chip information + * @groups: pointer to list of driver specific attribute groups + * + * Returns the pointer to the new device. The new device is automatically + * unregistered with the parent device. + */ +struct device * +devm_hwmon_device_register_with_info(struct device *dev, const char *name, + void *drvdata, + const struct hwmon_chip_info *chip, + const struct attribute_group **groups) +{ + struct device **ptr, *hwdev; + + if (!dev) + return ERR_PTR(-EINVAL); + + ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, + groups); + if (IS_ERR(hwdev)) + goto error; + + *ptr = hwdev; + devres_add(dev, ptr); + + return hwdev; + +error: + devres_free(ptr); + return hwdev; +} +EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); + +static int devm_hwmon_match(struct device *dev, void *res, void *data) +{ + struct device **hwdev = res; + + return *hwdev == data; +} + +/** + * devm_hwmon_device_unregister - removes a previously registered hwmon device + * + * @dev: the parent device of the device to unregister + */ +void devm_hwmon_device_unregister(struct device *dev) +{ + WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev)); +} +EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister); + +static char *__hwmon_sanitize_name(struct device *dev, const char *old_name) +{ + char *name, *p; + + if (dev) + name = devm_kstrdup(dev, old_name, GFP_KERNEL); + else + name = kstrdup(old_name, GFP_KERNEL); + if (!name) + return ERR_PTR(-ENOMEM); + + for (p = name; *p; p++) + if (hwmon_is_bad_char(*p)) + *p = '_'; + + return name; +} + +/** + * hwmon_sanitize_name - Replaces invalid characters in a hwmon name + * @name: NUL-terminated name + * + * Allocates a new string where any invalid characters will be replaced + * by an underscore. It is the responsibility of the caller to release + * the memory. + * + * Returns newly allocated name, or ERR_PTR on error. + */ +char *hwmon_sanitize_name(const char *name) +{ + return __hwmon_sanitize_name(NULL, name); +} +EXPORT_SYMBOL_GPL(hwmon_sanitize_name); + +/** + * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name() + * @dev: device to allocate memory for + * @name: NUL-terminated name + * + * Allocates a new string where any invalid characters will be replaced + * by an underscore. + * + * Returns newly allocated name, or ERR_PTR on error. + */ +char *devm_hwmon_sanitize_name(struct device *dev, const char *name) +{ + if (!dev) + return ERR_PTR(-EINVAL); + + return __hwmon_sanitize_name(dev, name); +} +EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name); + +static void __init hwmon_pci_quirks(void) +{ +#if defined CONFIG_X86 && defined CONFIG_PCI + struct pci_dev *sb; + u16 base; + u8 enable; + + /* Open access to 0x295-0x296 on MSI MS-7031 */ + sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); + if (sb) { + if (sb->subsystem_vendor == 0x1462 && /* MSI */ + sb->subsystem_device == 0x0031) { /* MS-7031 */ + pci_read_config_byte(sb, 0x48, &enable); + pci_read_config_word(sb, 0x64, &base); + + if (base == 0 && !(enable & BIT(2))) { + dev_info(&sb->dev, + "Opening wide generic port at 0x295\n"); + pci_write_config_word(sb, 0x64, 0x295); + pci_write_config_byte(sb, 0x48, + enable | BIT(2)); + } + } + pci_dev_put(sb); + } +#endif +} + +static int __init hwmon_init(void) +{ + int err; + + hwmon_pci_quirks(); + + err = class_register(&hwmon_class); + if (err) { + pr_err("couldn't register hwmon sysfs class\n"); + return err; + } + return 0; +} + +static void __exit hwmon_exit(void) +{ + class_unregister(&hwmon_class); +} + +subsys_initcall(hwmon_init); +module_exit(hwmon_exit); + +MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); +MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); +MODULE_LICENSE("GPL"); + |