diff options
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/x86/dell/Kconfig | 8 | ||||
-rw-r--r-- | drivers/platform/x86/dell/dell-wmi-ddv.c | 490 |
2 files changed, 493 insertions, 5 deletions
diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig index d319de8f2132..bdd78076b1d7 100644 --- a/drivers/platform/x86/dell/Kconfig +++ b/drivers/platform/x86/dell/Kconfig @@ -192,12 +192,12 @@ config DELL_WMI_DESCRIPTOR config DELL_WMI_DDV tristate "Dell WMI sensors Support" default m - depends on ACPI_BATTERY depends on ACPI_WMI + depends on ACPI_BATTERY || HWMON help - This option adds support for WMI-based sensors like - battery temperature sensors found on some Dell notebooks. - It also supports reading of the battery ePPID. + This option adds support for WMI-based fan and thermal sensors + found on some Dell notebooks. It also supports various WMI-based battery + extras like reading of the battery temperature and ePPID. To compile this drivers as a module, choose M here: the module will be called dell-wmi-ddv. diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c index 9695bf493ea6..d81dc4dd93e3 100644 --- a/drivers/platform/x86/dell/dell-wmi-ddv.c +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c @@ -12,19 +12,27 @@ #include <linux/device.h> #include <linux/dev_printk.h> #include <linux/errno.h> +#include <linux/kconfig.h> #include <linux/kernel.h> +#include <linux/hwmon.h> #include <linux/kstrtox.h> #include <linux/math.h> +#include <linux/math64.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/limits.h> +#include <linux/pm.h> #include <linux/power_supply.h> #include <linux/printk.h> #include <linux/seq_file.h> #include <linux/sysfs.h> +#include <linux/types.h> #include <linux/wmi.h> #include <acpi/battery.h> +#include <asm/unaligned.h> + #define DRIVER_NAME "dell-wmi-ddv" #define DELL_DDV_SUPPORTED_VERSION_MIN 2 @@ -63,13 +71,63 @@ enum dell_ddv_method { DELL_DDV_THERMAL_SENSOR_INFORMATION = 0x22, }; +struct fan_sensor_entry { + u8 type; + __le16 rpm; +} __packed; + +struct thermal_sensor_entry { + u8 type; + s8 now; + s8 min; + s8 max; + u8 unknown; +} __packed; + +struct combined_channel_info { + struct hwmon_channel_info info; + u32 config[]; +}; + +struct combined_chip_info { + struct hwmon_chip_info chip; + const struct hwmon_channel_info *info[]; +}; + +struct dell_wmi_ddv_sensors { + struct mutex lock; /* protect caching */ + unsigned long timestamp; + union acpi_object *obj; + u64 entries; +}; + struct dell_wmi_ddv_data { struct acpi_battery_hook hook; struct device_attribute temp_attr; struct device_attribute eppid_attr; + struct dell_wmi_ddv_sensors fans; + struct dell_wmi_ddv_sensors temps; struct wmi_device *wdev; }; +static const char * const fan_labels[] = { + "CPU Fan", + "Chassis Motherboard Fan", + "Video Fan", + "Power Supply Fan", + "Chipset Fan", + "Memory Fan", + "PCI Fan", + "HDD Fan", +}; + +static const char * const fan_dock_labels[] = { + "Docking Chassis/Motherboard Fan", + "Docking Video Fan", + "Docking Power Supply Fan", + "Docking Chipset Fan", +}; + static int dell_wmi_ddv_query_type(struct wmi_device *wdev, enum dell_ddv_method method, u32 arg, union acpi_object **result, acpi_object_type type) { @@ -171,6 +229,410 @@ static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_meth return dell_wmi_ddv_query_type(wdev, method, arg, result, ACPI_TYPE_STRING); } +/* + * Needs to be called with lock held, except during initialization. + */ +static int dell_wmi_ddv_update_sensors(struct wmi_device *wdev, enum dell_ddv_method method, + struct dell_wmi_ddv_sensors *sensors, size_t entry_size) +{ + u64 buffer_size, rem, entries; + union acpi_object *obj; + u8 *buffer; + int ret; + + if (sensors->obj) { + if (time_before(jiffies, sensors->timestamp + HZ)) + return 0; + + kfree(sensors->obj); + sensors->obj = NULL; + } + + ret = dell_wmi_ddv_query_buffer(wdev, method, 0, &obj); + if (ret < 0) + return ret; + + /* buffer format sanity check */ + buffer_size = obj->package.elements[0].integer.value; + buffer = obj->package.elements[1].buffer.pointer; + entries = div64_u64_rem(buffer_size, entry_size, &rem); + if (rem != 1 || buffer[buffer_size - 1] != 0xff) { + ret = -ENOMSG; + goto err_free; + } + + if (!entries) { + ret = -ENODATA; + goto err_free; + } + + sensors->obj = obj; + sensors->entries = entries; + sensors->timestamp = jiffies; + + return 0; + +err_free: + kfree(obj); + + return ret; +} + +static umode_t dell_wmi_ddv_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, + int channel) +{ + return 0444; +} + +static int dell_wmi_ddv_fan_read_channel(struct dell_wmi_ddv_data *data, u32 attr, int channel, + long *val) +{ + struct fan_sensor_entry *entry; + int ret; + + ret = dell_wmi_ddv_update_sensors(data->wdev, DELL_DDV_FAN_SENSOR_INFORMATION, + &data->fans, sizeof(*entry)); + if (ret < 0) + return ret; + + if (channel >= data->fans.entries) + return -ENXIO; + + entry = (struct fan_sensor_entry *)data->fans.obj->package.elements[1].buffer.pointer; + switch (attr) { + case hwmon_fan_input: + *val = get_unaligned_le16(&entry[channel].rpm); + return 0; + default: + break; + } + + return -EOPNOTSUPP; +} + +static int dell_wmi_ddv_temp_read_channel(struct dell_wmi_ddv_data *data, u32 attr, int channel, + long *val) +{ + struct thermal_sensor_entry *entry; + int ret; + + ret = dell_wmi_ddv_update_sensors(data->wdev, DELL_DDV_THERMAL_SENSOR_INFORMATION, + &data->temps, sizeof(*entry)); + if (ret < 0) + return ret; + + if (channel >= data->temps.entries) + return -ENXIO; + + entry = (struct thermal_sensor_entry *)data->temps.obj->package.elements[1].buffer.pointer; + switch (attr) { + case hwmon_temp_input: + *val = entry[channel].now * 1000; + return 0; + case hwmon_temp_min: + *val = entry[channel].min * 1000; + return 0; + case hwmon_temp_max: + *val = entry[channel].max * 1000; + return 0; + default: + break; + } + + return -EOPNOTSUPP; +} + +static int dell_wmi_ddv_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + struct dell_wmi_ddv_data *data = dev_get_drvdata(dev); + int ret; + + switch (type) { + case hwmon_fan: + mutex_lock(&data->fans.lock); + ret = dell_wmi_ddv_fan_read_channel(data, attr, channel, val); + mutex_unlock(&data->fans.lock); + return ret; + case hwmon_temp: + mutex_lock(&data->temps.lock); + ret = dell_wmi_ddv_temp_read_channel(data, attr, channel, val); + mutex_unlock(&data->temps.lock); + return ret; + default: + break; + } + + return -EOPNOTSUPP; +} + +static int dell_wmi_ddv_fan_read_string(struct dell_wmi_ddv_data *data, int channel, + const char **str) +{ + struct fan_sensor_entry *entry; + int ret; + u8 type; + + ret = dell_wmi_ddv_update_sensors(data->wdev, DELL_DDV_FAN_SENSOR_INFORMATION, + &data->fans, sizeof(*entry)); + if (ret < 0) + return ret; + + if (channel >= data->fans.entries) + return -ENXIO; + + entry = (struct fan_sensor_entry *)data->fans.obj->package.elements[1].buffer.pointer; + type = entry[channel].type; + switch (type) { + case 0x00 ... 0x07: + *str = fan_labels[type]; + break; + case 0x11 ... 0x14: + *str = fan_dock_labels[type - 0x11]; + break; + default: + *str = "Unknown Fan"; + break; + } + + return 0; +} + +static int dell_wmi_ddv_temp_read_string(struct dell_wmi_ddv_data *data, int channel, + const char **str) +{ + struct thermal_sensor_entry *entry; + int ret; + + ret = dell_wmi_ddv_update_sensors(data->wdev, DELL_DDV_THERMAL_SENSOR_INFORMATION, + &data->temps, sizeof(*entry)); + if (ret < 0) + return ret; + + if (channel >= data->temps.entries) + return -ENXIO; + + entry = (struct thermal_sensor_entry *)data->temps.obj->package.elements[1].buffer.pointer; + switch (entry[channel].type) { + case 0x00: + *str = "CPU"; + break; + case 0x11: + *str = "Video"; + break; + case 0x22: + *str = "Memory"; /* sometimes called DIMM */ + break; + case 0x33: + *str = "Other"; + break; + case 0x44: + *str = "Ambient"; /* sometimes called SKIN */ + break; + case 0x52: + *str = "SODIMM"; + break; + case 0x55: + *str = "HDD"; + break; + case 0x62: + *str = "SODIMM 2"; + break; + case 0x73: + *str = "NB"; + break; + case 0x83: + *str = "Charger"; + break; + case 0xbb: + *str = "Memory 3"; + break; + default: + *str = "Unknown"; + break; + } + + return 0; +} + +static int dell_wmi_ddv_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, const char **str) +{ + struct dell_wmi_ddv_data *data = dev_get_drvdata(dev); + int ret; + + switch (type) { + case hwmon_fan: + switch (attr) { + case hwmon_fan_label: + mutex_lock(&data->fans.lock); + ret = dell_wmi_ddv_fan_read_string(data, channel, str); + mutex_unlock(&data->fans.lock); + return ret; + default: + break; + } + break; + case hwmon_temp: + switch (attr) { + case hwmon_temp_label: + mutex_lock(&data->temps.lock); + ret = dell_wmi_ddv_temp_read_string(data, channel, str); + mutex_unlock(&data->temps.lock); + return ret; + default: + break; + } + break; + default: + break; + } + + return -EOPNOTSUPP; +} + +static const struct hwmon_ops dell_wmi_ddv_ops = { + .is_visible = dell_wmi_ddv_is_visible, + .read = dell_wmi_ddv_read, + .read_string = dell_wmi_ddv_read_string, +}; + +static struct hwmon_channel_info *dell_wmi_ddv_channel_create(struct device *dev, u64 count, + enum hwmon_sensor_types type, + u32 config) +{ + struct combined_channel_info *cinfo; + int i; + + cinfo = devm_kzalloc(dev, struct_size(cinfo, config, count + 1), GFP_KERNEL); + if (!cinfo) + return ERR_PTR(-ENOMEM); + + cinfo->info.type = type; + cinfo->info.config = cinfo->config; + + for (i = 0; i < count; i++) + cinfo->config[i] = config; + + return &cinfo->info; +} + +static void dell_wmi_ddv_hwmon_cache_invalidate(struct dell_wmi_ddv_sensors *sensors) +{ + mutex_lock(&sensors->lock); + kfree(sensors->obj); + sensors->obj = NULL; + mutex_unlock(&sensors->lock); +} + +static void dell_wmi_ddv_hwmon_cache_destroy(void *data) +{ + struct dell_wmi_ddv_sensors *sensors = data; + + mutex_destroy(&sensors->lock); + kfree(sensors->obj); +} + +static struct hwmon_channel_info *dell_wmi_ddv_channel_init(struct wmi_device *wdev, + enum dell_ddv_method method, + struct dell_wmi_ddv_sensors *sensors, + size_t entry_size, + enum hwmon_sensor_types type, + u32 config) +{ + struct hwmon_channel_info *info; + int ret; + + ret = dell_wmi_ddv_update_sensors(wdev, method, sensors, entry_size); + if (ret < 0) + return ERR_PTR(ret); + + mutex_init(&sensors->lock); + + ret = devm_add_action_or_reset(&wdev->dev, dell_wmi_ddv_hwmon_cache_destroy, sensors); + if (ret < 0) + return ERR_PTR(ret); + + info = dell_wmi_ddv_channel_create(&wdev->dev, sensors->entries, type, config); + if (IS_ERR(info)) + devm_release_action(&wdev->dev, dell_wmi_ddv_hwmon_cache_destroy, sensors); + + return info; +} + +static int dell_wmi_ddv_hwmon_add(struct dell_wmi_ddv_data *data) +{ + struct wmi_device *wdev = data->wdev; + struct combined_chip_info *cinfo; + struct hwmon_channel_info *info; + struct device *hdev; + int index = 0; + int ret; + + if (!devres_open_group(&wdev->dev, dell_wmi_ddv_hwmon_add, GFP_KERNEL)) + return -ENOMEM; + + cinfo = devm_kzalloc(&wdev->dev, struct_size(cinfo, info, 4), GFP_KERNEL); + if (!cinfo) { + ret = -ENOMEM; + + goto err_release; + } + + cinfo->chip.ops = &dell_wmi_ddv_ops; + cinfo->chip.info = cinfo->info; + + info = dell_wmi_ddv_channel_create(&wdev->dev, 1, hwmon_chip, HWMON_C_REGISTER_TZ); + if (IS_ERR(info)) { + ret = PTR_ERR(info); + + goto err_release; + } + + cinfo->info[index] = info; + index++; + + info = dell_wmi_ddv_channel_init(wdev, DELL_DDV_FAN_SENSOR_INFORMATION, &data->fans, + sizeof(struct fan_sensor_entry), hwmon_fan, + (HWMON_F_INPUT | HWMON_F_LABEL)); + if (!IS_ERR(info)) { + cinfo->info[index] = info; + index++; + } + + info = dell_wmi_ddv_channel_init(wdev, DELL_DDV_THERMAL_SENSOR_INFORMATION, &data->temps, + sizeof(struct thermal_sensor_entry), hwmon_temp, + (HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | + HWMON_T_LABEL)); + if (!IS_ERR(info)) { + cinfo->info[index] = info; + index++; + } + + if (index < 2) { + ret = -ENODEV; + + goto err_release; + } + + hdev = devm_hwmon_device_register_with_info(&wdev->dev, "dell_ddv", data, &cinfo->chip, + NULL); + if (IS_ERR(hdev)) { + ret = PTR_ERR(hdev); + + goto err_release; + } + + devres_close_group(&wdev->dev, dell_wmi_ddv_hwmon_add); + + return 0; + +err_release: + devres_release_group(&wdev->dev, dell_wmi_ddv_hwmon_add); + + return ret; +} + static int dell_wmi_ddv_battery_index(struct acpi_device *acpi_dev, u32 *index) { const char *uid_str; @@ -370,9 +832,34 @@ static int dell_wmi_ddv_probe(struct wmi_device *wdev, const void *context) dell_wmi_ddv_debugfs_init(wdev); - return dell_wmi_ddv_battery_add(data); + if (IS_REACHABLE(CONFIG_ACPI_BATTERY)) { + ret = dell_wmi_ddv_battery_add(data); + if (ret < 0 && ret != -ENODEV) + dev_warn(&wdev->dev, "Unable to register ACPI battery hook: %d\n", ret); + } + + if (IS_REACHABLE(CONFIG_HWMON)) { + ret = dell_wmi_ddv_hwmon_add(data); + if (ret < 0 && ret != -ENODEV) + dev_warn(&wdev->dev, "Unable to register hwmon interface: %d\n", ret); + } + + return 0; } +static int dell_wmi_ddv_resume(struct device *dev) +{ + struct dell_wmi_ddv_data *data = dev_get_drvdata(dev); + + /* Force re-reading of all sensors */ + dell_wmi_ddv_hwmon_cache_invalidate(&data->fans); + dell_wmi_ddv_hwmon_cache_invalidate(&data->temps); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(dell_wmi_ddv_dev_pm_ops, NULL, dell_wmi_ddv_resume); + static const struct wmi_device_id dell_wmi_ddv_id_table[] = { { DELL_DDV_GUID, NULL }, { } @@ -382,6 +869,7 @@ MODULE_DEVICE_TABLE(wmi, dell_wmi_ddv_id_table); static struct wmi_driver dell_wmi_ddv_driver = { .driver = { .name = DRIVER_NAME, + .pm = pm_sleep_ptr(&dell_wmi_ddv_dev_pm_ops), }, .id_table = dell_wmi_ddv_id_table, .probe = dell_wmi_ddv_probe, |