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-rw-r--r--drivers/hwmon/dell-smm-hwmon.c1468
1 files changed, 1468 insertions, 0 deletions
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
new file mode 100644
index 000000000..1572b5416
--- /dev/null
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -0,0 +1,1468 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
+ *
+ * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
+ *
+ * Hwmon integration:
+ * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
+ * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
+ * Copyright (C) 2014, 2015 Pali Rohár <pali@kernel.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/cpu.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/kconfig.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/string.h>
+#include <linux/thermal.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+#include <linux/i8k.h>
+
+#define I8K_SMM_FN_STATUS 0x0025
+#define I8K_SMM_POWER_STATUS 0x0069
+#define I8K_SMM_SET_FAN 0x01a3
+#define I8K_SMM_GET_FAN 0x00a3
+#define I8K_SMM_GET_SPEED 0x02a3
+#define I8K_SMM_GET_FAN_TYPE 0x03a3
+#define I8K_SMM_GET_NOM_SPEED 0x04a3
+#define I8K_SMM_GET_TEMP 0x10a3
+#define I8K_SMM_GET_TEMP_TYPE 0x11a3
+#define I8K_SMM_GET_DELL_SIG1 0xfea3
+#define I8K_SMM_GET_DELL_SIG2 0xffa3
+
+/* in usecs */
+#define DELL_SMM_MAX_DURATION 250000
+
+#define I8K_FAN_MULT 30
+#define I8K_FAN_RPM_THRESHOLD 1000
+#define I8K_MAX_TEMP 127
+
+#define I8K_FN_NONE 0x00
+#define I8K_FN_UP 0x01
+#define I8K_FN_DOWN 0x02
+#define I8K_FN_MUTE 0x04
+#define I8K_FN_MASK 0x07
+#define I8K_FN_SHIFT 8
+
+#define I8K_POWER_AC 0x05
+#define I8K_POWER_BATTERY 0x01
+
+#define DELL_SMM_NO_TEMP 10
+#define DELL_SMM_NO_FANS 3
+
+struct dell_smm_data {
+ struct mutex i8k_mutex; /* lock for sensors writes */
+ char bios_version[4];
+ char bios_machineid[16];
+ uint i8k_fan_mult;
+ uint i8k_pwm_mult;
+ uint i8k_fan_max;
+ bool disallow_fan_type_call;
+ bool disallow_fan_support;
+ unsigned int manual_fan;
+ unsigned int auto_fan;
+ int temp_type[DELL_SMM_NO_TEMP];
+ bool fan[DELL_SMM_NO_FANS];
+ int fan_type[DELL_SMM_NO_FANS];
+ int *fan_nominal_speed[DELL_SMM_NO_FANS];
+};
+
+struct dell_smm_cooling_data {
+ u8 fan_num;
+ struct dell_smm_data *data;
+};
+
+MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
+MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
+MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i8k");
+
+static bool force;
+module_param_unsafe(force, bool, 0);
+MODULE_PARM_DESC(force, "Force loading without checking for supported models and features");
+
+static bool ignore_dmi;
+module_param(ignore_dmi, bool, 0);
+MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
+
+#if IS_ENABLED(CONFIG_I8K)
+static bool restricted = true;
+module_param(restricted, bool, 0);
+MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
+
+static bool power_status;
+module_param(power_status, bool, 0600);
+MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
+#endif
+
+static uint fan_mult;
+module_param(fan_mult, uint, 0);
+MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
+
+static uint fan_max;
+module_param(fan_max, uint, 0);
+MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
+
+struct smm_regs {
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ unsigned int esi;
+ unsigned int edi;
+};
+
+static const char * const temp_labels[] = {
+ "CPU",
+ "GPU",
+ "SODIMM",
+ "Other",
+ "Ambient",
+ "Other",
+};
+
+static const char * const fan_labels[] = {
+ "Processor Fan",
+ "Motherboard Fan",
+ "Video Fan",
+ "Power Supply Fan",
+ "Chipset Fan",
+ "Other Fan",
+};
+
+static const char * const docking_labels[] = {
+ "Docking Processor Fan",
+ "Docking Motherboard Fan",
+ "Docking Video Fan",
+ "Docking Power Supply Fan",
+ "Docking Chipset Fan",
+ "Docking Other Fan",
+};
+
+static inline const char __init *i8k_get_dmi_data(int field)
+{
+ const char *dmi_data = dmi_get_system_info(field);
+
+ return dmi_data && *dmi_data ? dmi_data : "?";
+}
+
+/*
+ * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
+ */
+static int i8k_smm_func(void *par)
+{
+ ktime_t calltime = ktime_get();
+ struct smm_regs *regs = par;
+ int eax = regs->eax;
+ int ebx = regs->ebx;
+ unsigned char carry;
+ long long duration;
+
+ /* SMM requires CPU 0 */
+ if (smp_processor_id() != 0)
+ return -EBUSY;
+
+ asm volatile("out %%al,$0xb2\n\t"
+ "out %%al,$0x84\n\t"
+ "setc %0\n"
+ : "=mr" (carry),
+ "+a" (regs->eax),
+ "+b" (regs->ebx),
+ "+c" (regs->ecx),
+ "+d" (regs->edx),
+ "+S" (regs->esi),
+ "+D" (regs->edi));
+
+ duration = ktime_us_delta(ktime_get(), calltime);
+ pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n",
+ eax, ebx, regs->eax & 0xffff, carry, duration);
+
+ if (duration > DELL_SMM_MAX_DURATION)
+ pr_warn_once("SMM call took %lld usecs!\n", duration);
+
+ if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
+ return -EINVAL;
+
+ return 0;
+}
+
+/*
+ * Call the System Management Mode BIOS.
+ */
+static int i8k_smm(struct smm_regs *regs)
+{
+ int ret;
+
+ cpus_read_lock();
+ ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
+ cpus_read_unlock();
+
+ return ret;
+}
+
+/*
+ * Read the fan status.
+ */
+static int i8k_get_fan_status(const struct dell_smm_data *data, u8 fan)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_FAN,
+ .ebx = fan,
+ };
+
+ if (data->disallow_fan_support)
+ return -EINVAL;
+
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+/*
+ * Read the fan speed in RPM.
+ */
+static int i8k_get_fan_speed(const struct dell_smm_data *data, u8 fan)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_SPEED,
+ .ebx = fan,
+ };
+
+ if (data->disallow_fan_support)
+ return -EINVAL;
+
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
+}
+
+/*
+ * Read the fan type.
+ */
+static int _i8k_get_fan_type(const struct dell_smm_data *data, u8 fan)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_FAN_TYPE,
+ .ebx = fan,
+ };
+
+ if (data->disallow_fan_support || data->disallow_fan_type_call)
+ return -EINVAL;
+
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+static int i8k_get_fan_type(struct dell_smm_data *data, u8 fan)
+{
+ /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
+ if (data->fan_type[fan] == INT_MIN)
+ data->fan_type[fan] = _i8k_get_fan_type(data, fan);
+
+ return data->fan_type[fan];
+}
+
+/*
+ * Read the fan nominal rpm for specific fan speed.
+ */
+static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8 fan, int speed)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_NOM_SPEED,
+ .ebx = fan | (speed << 8),
+ };
+
+ if (data->disallow_fan_support)
+ return -EINVAL;
+
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff);
+}
+
+/*
+ * Enable or disable automatic BIOS fan control support
+ */
+static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable)
+{
+ struct smm_regs regs = { };
+
+ if (data->disallow_fan_support)
+ return -EINVAL;
+
+ regs.eax = enable ? data->auto_fan : data->manual_fan;
+ return i8k_smm(&regs);
+}
+
+/*
+ * Set the fan speed (off, low, high, ...).
+ */
+static int i8k_set_fan(const struct dell_smm_data *data, u8 fan, int speed)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
+
+ if (data->disallow_fan_support)
+ return -EINVAL;
+
+ speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed);
+ regs.ebx = fan | (speed << 8);
+
+ return i8k_smm(&regs);
+}
+
+static int __init i8k_get_temp_type(u8 sensor)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_TEMP_TYPE,
+ .ebx = sensor,
+ };
+
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+/*
+ * Read the cpu temperature.
+ */
+static int _i8k_get_temp(u8 sensor)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_TEMP,
+ .ebx = sensor,
+ };
+
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+static int i8k_get_temp(u8 sensor)
+{
+ int temp = _i8k_get_temp(sensor);
+
+ /*
+ * Sometimes the temperature sensor returns 0x99, which is out of range.
+ * In this case we retry (once) before returning an error.
+ # 1003655137 00000058 00005a4b
+ # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
+ # 1003655139 00000054 00005c52
+ */
+ if (temp == 0x99) {
+ msleep(100);
+ temp = _i8k_get_temp(sensor);
+ }
+ /*
+ * Return -ENODATA for all invalid temperatures.
+ *
+ * Known instances are the 0x99 value as seen above as well as
+ * 0xc1 (193), which may be returned when trying to read the GPU
+ * temperature if the system supports a GPU and it is currently
+ * turned off.
+ */
+ if (temp > I8K_MAX_TEMP)
+ return -ENODATA;
+
+ return temp;
+}
+
+static int __init i8k_get_dell_signature(int req_fn)
+{
+ struct smm_regs regs = { .eax = req_fn, };
+ int rc;
+
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
+
+ return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
+}
+
+#if IS_ENABLED(CONFIG_I8K)
+
+/*
+ * Read the Fn key status.
+ */
+static int i8k_get_fn_status(void)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
+ int rc;
+
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
+
+ switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
+ case I8K_FN_UP:
+ return I8K_VOL_UP;
+ case I8K_FN_DOWN:
+ return I8K_VOL_DOWN;
+ case I8K_FN_MUTE:
+ return I8K_VOL_MUTE;
+ default:
+ return 0;
+ }
+}
+
+/*
+ * Read the power status.
+ */
+static int i8k_get_power_status(void)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
+ int rc;
+
+ rc = i8k_smm(&regs);
+ if (rc < 0)
+ return rc;
+
+ return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
+}
+
+/*
+ * Procfs interface
+ */
+
+static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+ struct dell_smm_data *data = pde_data(file_inode(fp));
+ int __user *argp = (int __user *)arg;
+ int speed, err;
+ int val = 0;
+
+ if (!argp)
+ return -EINVAL;
+
+ switch (cmd) {
+ case I8K_BIOS_VERSION:
+ if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) ||
+ !isdigit(data->bios_version[2]))
+ return -EINVAL;
+
+ val = (data->bios_version[0] << 16) |
+ (data->bios_version[1] << 8) | data->bios_version[2];
+
+ if (copy_to_user(argp, &val, sizeof(val)))
+ return -EFAULT;
+
+ return 0;
+ case I8K_MACHINE_ID:
+ if (restricted && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_to_user(argp, data->bios_machineid, sizeof(data->bios_machineid)))
+ return -EFAULT;
+
+ return 0;
+ case I8K_FN_STATUS:
+ val = i8k_get_fn_status();
+ break;
+
+ case I8K_POWER_STATUS:
+ val = i8k_get_power_status();
+ break;
+
+ case I8K_GET_TEMP:
+ val = i8k_get_temp(0);
+ break;
+
+ case I8K_GET_SPEED:
+ if (copy_from_user(&val, argp, sizeof(int)))
+ return -EFAULT;
+
+ if (val > U8_MAX || val < 0)
+ return -EINVAL;
+
+ val = i8k_get_fan_speed(data, val);
+ break;
+
+ case I8K_GET_FAN:
+ if (copy_from_user(&val, argp, sizeof(int)))
+ return -EFAULT;
+
+ if (val > U8_MAX || val < 0)
+ return -EINVAL;
+
+ val = i8k_get_fan_status(data, val);
+ break;
+
+ case I8K_SET_FAN:
+ if (restricted && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(&val, argp, sizeof(int)))
+ return -EFAULT;
+
+ if (val > U8_MAX || val < 0)
+ return -EINVAL;
+
+ if (copy_from_user(&speed, argp + 1, sizeof(int)))
+ return -EFAULT;
+
+ mutex_lock(&data->i8k_mutex);
+ err = i8k_set_fan(data, val, speed);
+ if (err < 0)
+ val = err;
+ else
+ val = i8k_get_fan_status(data, val);
+ mutex_unlock(&data->i8k_mutex);
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ if (val < 0)
+ return val;
+
+ if (copy_to_user(argp, &val, sizeof(int)))
+ return -EFAULT;
+
+ return 0;
+}
+
+/*
+ * Print the information for /proc/i8k.
+ */
+static int i8k_proc_show(struct seq_file *seq, void *offset)
+{
+ struct dell_smm_data *data = seq->private;
+ int fn_key, cpu_temp, ac_power;
+ int left_fan, right_fan, left_speed, right_speed;
+
+ cpu_temp = i8k_get_temp(0); /* 11100 µs */
+ left_fan = i8k_get_fan_status(data, I8K_FAN_LEFT); /* 580 µs */
+ right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */
+ left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */
+ right_speed = i8k_get_fan_speed(data, I8K_FAN_RIGHT); /* 580 µs */
+ fn_key = i8k_get_fn_status(); /* 750 µs */
+ if (power_status)
+ ac_power = i8k_get_power_status(); /* 14700 µs */
+ else
+ ac_power = -1;
+
+ /*
+ * Info:
+ *
+ * 1) Format version (this will change if format changes)
+ * 2) BIOS version
+ * 3) BIOS machine ID
+ * 4) Cpu temperature
+ * 5) Left fan status
+ * 6) Right fan status
+ * 7) Left fan speed
+ * 8) Right fan speed
+ * 9) AC power
+ * 10) Fn Key status
+ */
+ seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
+ I8K_PROC_FMT,
+ data->bios_version,
+ (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->bios_machineid,
+ cpu_temp,
+ left_fan, right_fan, left_speed, right_speed,
+ ac_power, fn_key);
+
+ return 0;
+}
+
+static int i8k_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, i8k_proc_show, pde_data(inode));
+}
+
+static const struct proc_ops i8k_proc_ops = {
+ .proc_open = i8k_open_fs,
+ .proc_read = seq_read,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
+ .proc_ioctl = i8k_ioctl,
+};
+
+static void i8k_exit_procfs(void *param)
+{
+ remove_proc_entry("i8k", NULL);
+}
+
+static void __init i8k_init_procfs(struct device *dev)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+
+ /* Only register exit function if creation was successful */
+ if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
+ devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
+}
+
+#else
+
+static void __init i8k_init_procfs(struct device *dev)
+{
+}
+
+#endif
+
+static int dell_smm_get_max_state(struct thermal_cooling_device *dev, unsigned long *state)
+{
+ struct dell_smm_cooling_data *cdata = dev->devdata;
+
+ *state = cdata->data->i8k_fan_max;
+
+ return 0;
+}
+
+static int dell_smm_get_cur_state(struct thermal_cooling_device *dev, unsigned long *state)
+{
+ struct dell_smm_cooling_data *cdata = dev->devdata;
+ int ret;
+
+ ret = i8k_get_fan_status(cdata->data, cdata->fan_num);
+ if (ret < 0)
+ return ret;
+
+ *state = ret;
+
+ return 0;
+}
+
+static int dell_smm_set_cur_state(struct thermal_cooling_device *dev, unsigned long state)
+{
+ struct dell_smm_cooling_data *cdata = dev->devdata;
+ struct dell_smm_data *data = cdata->data;
+ int ret;
+
+ if (state > data->i8k_fan_max)
+ return -EINVAL;
+
+ mutex_lock(&data->i8k_mutex);
+ ret = i8k_set_fan(data, cdata->fan_num, (int)state);
+ mutex_unlock(&data->i8k_mutex);
+
+ return ret;
+}
+
+static const struct thermal_cooling_device_ops dell_smm_cooling_ops = {
+ .get_max_state = dell_smm_get_max_state,
+ .get_cur_state = dell_smm_get_cur_state,
+ .set_cur_state = dell_smm_set_cur_state,
+};
+
+static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
+ int channel)
+{
+ const struct dell_smm_data *data = drvdata;
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ /* _i8k_get_temp() is fine since we do not care about the actual value */
+ if (data->temp_type[channel] >= 0 || _i8k_get_temp(channel) >= 0)
+ return 0444;
+
+ break;
+ case hwmon_temp_label:
+ if (data->temp_type[channel] >= 0)
+ return 0444;
+
+ break;
+ default:
+ break;
+ }
+ break;
+ case hwmon_fan:
+ if (data->disallow_fan_support)
+ break;
+
+ switch (attr) {
+ case hwmon_fan_input:
+ if (data->fan[channel])
+ return 0444;
+
+ break;
+ case hwmon_fan_label:
+ if (data->fan[channel] && !data->disallow_fan_type_call)
+ return 0444;
+
+ break;
+ case hwmon_fan_min:
+ case hwmon_fan_max:
+ case hwmon_fan_target:
+ if (data->fan_nominal_speed[channel])
+ return 0444;
+
+ break;
+ default:
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ if (data->disallow_fan_support)
+ break;
+
+ switch (attr) {
+ case hwmon_pwm_input:
+ if (data->fan[channel])
+ return 0644;
+
+ break;
+ case hwmon_pwm_enable:
+ if (data->auto_fan)
+ /*
+ * There is no command for retrieve the current status
+ * from BIOS, and userspace/firmware itself can change
+ * it.
+ * Thus we can only provide write-only access for now.
+ */
+ return 0200;
+
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+ long *val)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+ int mult = data->i8k_fan_mult;
+ int ret;
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ ret = i8k_get_temp(channel);
+ if (ret < 0)
+ return ret;
+
+ *val = ret * 1000;
+
+ return 0;
+ default:
+ break;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_input:
+ ret = i8k_get_fan_speed(data, channel);
+ if (ret < 0)
+ return ret;
+
+ *val = ret;
+
+ return 0;
+ case hwmon_fan_min:
+ *val = data->fan_nominal_speed[channel][0] * mult;
+
+ return 0;
+ case hwmon_fan_max:
+ *val = data->fan_nominal_speed[channel][data->i8k_fan_max] * mult;
+
+ return 0;
+ case hwmon_fan_target:
+ ret = i8k_get_fan_status(data, channel);
+ if (ret < 0)
+ return ret;
+
+ if (ret > data->i8k_fan_max)
+ ret = data->i8k_fan_max;
+
+ *val = data->fan_nominal_speed[channel][ret] * mult;
+
+ return 0;
+ default:
+ break;
+ }
+ break;
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ ret = i8k_get_fan_status(data, channel);
+ if (ret < 0)
+ return ret;
+
+ *val = clamp_val(ret * data->i8k_pwm_mult, 0, 255);
+
+ return 0;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel)
+{
+ bool dock = false;
+ int type = i8k_get_fan_type(data, channel);
+
+ if (type < 0)
+ return ERR_PTR(type);
+
+ if (type & 0x10) {
+ dock = true;
+ type &= 0x0F;
+ }
+
+ if (type >= ARRAY_SIZE(fan_labels))
+ type = ARRAY_SIZE(fan_labels) - 1;
+
+ return dock ? docking_labels[type] : fan_labels[type];
+}
+
+static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+ int channel, const char **str)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+
+ switch (type) {
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_label:
+ *str = temp_labels[data->temp_type[channel]];
+ return 0;
+ default:
+ break;
+ }
+ break;
+ case hwmon_fan:
+ switch (attr) {
+ case hwmon_fan_label:
+ *str = dell_smm_fan_label(data, channel);
+ return PTR_ERR_OR_ZERO(*str);
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
+ long val)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+ unsigned long pwm;
+ bool enable;
+ int err;
+
+ switch (type) {
+ case hwmon_pwm:
+ switch (attr) {
+ case hwmon_pwm_input:
+ pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0,
+ data->i8k_fan_max);
+
+ mutex_lock(&data->i8k_mutex);
+ err = i8k_set_fan(data, channel, pwm);
+ mutex_unlock(&data->i8k_mutex);
+
+ if (err < 0)
+ return err;
+
+ return 0;
+ case hwmon_pwm_enable:
+ if (!val)
+ return -EINVAL;
+
+ if (val == 1)
+ enable = false;
+ else
+ enable = true;
+
+ mutex_lock(&data->i8k_mutex);
+ err = i8k_enable_fan_auto_mode(data, enable);
+ mutex_unlock(&data->i8k_mutex);
+
+ if (err < 0)
+ return err;
+
+ return 0;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static const struct hwmon_ops dell_smm_ops = {
+ .is_visible = dell_smm_is_visible,
+ .read = dell_smm_read,
+ .read_string = dell_smm_read_string,
+ .write = dell_smm_write,
+};
+
+static const struct hwmon_channel_info *dell_smm_info[] = {
+ HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL,
+ HWMON_T_INPUT | HWMON_T_LABEL
+ ),
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
+ HWMON_F_TARGET,
+ HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
+ HWMON_F_TARGET,
+ HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
+ HWMON_F_TARGET
+ ),
+ HWMON_CHANNEL_INFO(pwm,
+ HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
+ HWMON_PWM_INPUT,
+ HWMON_PWM_INPUT
+ ),
+ NULL
+};
+
+static const struct hwmon_chip_info dell_smm_chip_info = {
+ .ops = &dell_smm_ops,
+ .info = dell_smm_info,
+};
+
+static int __init dell_smm_init_cdev(struct device *dev, u8 fan_num)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+ struct thermal_cooling_device *cdev;
+ struct dell_smm_cooling_data *cdata;
+ int ret = 0;
+ char *name;
+
+ name = kasprintf(GFP_KERNEL, "dell-smm-fan%u", fan_num + 1);
+ if (!name)
+ return -ENOMEM;
+
+ cdata = devm_kmalloc(dev, sizeof(*cdata), GFP_KERNEL);
+ if (cdata) {
+ cdata->fan_num = fan_num;
+ cdata->data = data;
+ cdev = devm_thermal_of_cooling_device_register(dev, NULL, name, cdata,
+ &dell_smm_cooling_ops);
+ if (IS_ERR(cdev)) {
+ devm_kfree(dev, cdata);
+ ret = PTR_ERR(cdev);
+ }
+ } else {
+ ret = -ENOMEM;
+ }
+
+ kfree(name);
+
+ return ret;
+}
+
+static int __init dell_smm_init_hwmon(struct device *dev)
+{
+ struct dell_smm_data *data = dev_get_drvdata(dev);
+ struct device *dell_smm_hwmon_dev;
+ int state, err;
+ u8 i;
+
+ for (i = 0; i < DELL_SMM_NO_TEMP; i++) {
+ data->temp_type[i] = i8k_get_temp_type(i);
+ if (data->temp_type[i] < 0)
+ continue;
+
+ if (data->temp_type[i] >= ARRAY_SIZE(temp_labels))
+ data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1;
+ }
+
+ for (i = 0; i < DELL_SMM_NO_FANS; i++) {
+ data->fan_type[i] = INT_MIN;
+ err = i8k_get_fan_status(data, i);
+ if (err < 0)
+ err = i8k_get_fan_type(data, i);
+
+ if (err < 0)
+ continue;
+
+ data->fan[i] = true;
+
+ /* the cooling device is not critical, ignore failures */
+ if (IS_REACHABLE(CONFIG_THERMAL)) {
+ err = dell_smm_init_cdev(dev, i);
+ if (err < 0)
+ dev_warn(dev, "Failed to register cooling device for fan %u\n",
+ i + 1);
+ }
+
+ data->fan_nominal_speed[i] = devm_kmalloc_array(dev, data->i8k_fan_max + 1,
+ sizeof(*data->fan_nominal_speed[i]),
+ GFP_KERNEL);
+ if (!data->fan_nominal_speed[i])
+ continue;
+
+ for (state = 0; state <= data->i8k_fan_max; state++) {
+ err = i8k_get_fan_nominal_speed(data, i, state);
+ if (err < 0) {
+ /* Mark nominal speed table as invalid in case of error */
+ devm_kfree(dev, data->fan_nominal_speed[i]);
+ data->fan_nominal_speed[i] = NULL;
+ break;
+ }
+ data->fan_nominal_speed[i][state] = err;
+ /*
+ * Autodetect fan multiplier based on nominal rpm if multiplier
+ * was not specified as module param or in DMI. If fan reports
+ * rpm value too high then set multiplier to 1.
+ */
+ if (!fan_mult && err > I8K_FAN_RPM_THRESHOLD)
+ data->i8k_fan_mult = 1;
+ }
+ }
+
+ dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, "dell_smm", data,
+ &dell_smm_chip_info, NULL);
+
+ return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev);
+}
+
+struct i8k_config_data {
+ uint fan_mult;
+ uint fan_max;
+};
+
+enum i8k_configs {
+ DELL_LATITUDE_D520,
+ DELL_PRECISION_490,
+ DELL_STUDIO,
+ DELL_XPS,
+};
+
+/*
+ * Only use for machines which need some special configuration
+ * in order to work correctly (e.g. if autoconfig fails on this machines).
+ */
+
+static const struct i8k_config_data i8k_config_data[] __initconst = {
+ [DELL_LATITUDE_D520] = {
+ .fan_mult = 1,
+ .fan_max = I8K_FAN_TURBO,
+ },
+ [DELL_PRECISION_490] = {
+ .fan_mult = 1,
+ .fan_max = I8K_FAN_TURBO,
+ },
+ [DELL_STUDIO] = {
+ .fan_mult = 1,
+ .fan_max = I8K_FAN_HIGH,
+ },
+ [DELL_XPS] = {
+ .fan_mult = 1,
+ .fan_max = I8K_FAN_HIGH,
+ },
+};
+
+static const struct dmi_system_id i8k_dmi_table[] __initconst = {
+ {
+ .ident = "Dell G5 5590",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "G5 5590"),
+ },
+ },
+ {
+ .ident = "Dell Inspiron",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
+ },
+ },
+ {
+ .ident = "Dell Latitude",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
+ },
+ },
+ {
+ .ident = "Dell Inspiron 2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
+ },
+ },
+ {
+ .ident = "Dell Latitude D520",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
+ },
+ .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
+ },
+ {
+ .ident = "Dell Latitude 2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
+ },
+ },
+ { /* UK Inspiron 6400 */
+ .ident = "Dell Inspiron 3",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
+ },
+ },
+ {
+ .ident = "Dell Inspiron 3",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
+ },
+ },
+ {
+ .ident = "Dell Precision 490",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME,
+ "Precision WorkStation 490"),
+ },
+ .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
+ },
+ {
+ .ident = "Dell Precision",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
+ },
+ },
+ {
+ .ident = "Dell Vostro",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
+ },
+ },
+ {
+ .ident = "Dell Studio",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
+ },
+ .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
+ },
+ {
+ .ident = "Dell XPS M140",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
+ },
+ .driver_data = (void *)&i8k_config_data[DELL_XPS],
+ },
+ {
+ .ident = "Dell XPS",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS"),
+ },
+ },
+ { }
+};
+
+MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
+
+/*
+ * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
+ * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
+ * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
+ * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
+ */
+static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
+ {
+ .ident = "Dell Studio XPS 8000",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
+ },
+ },
+ {
+ .ident = "Dell Studio XPS 8100",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
+ },
+ },
+ {
+ .ident = "Dell Inspiron 580",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
+ },
+ },
+ {
+ .ident = "Dell Inspiron 3505",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 3505"),
+ },
+ },
+ { }
+};
+
+/*
+ * On some machines all fan related SMM functions implemented by Dell BIOS
+ * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
+ * support for affected blacklisted Dell machines stay disabled.
+ * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
+ */
+static const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = {
+ {
+ .ident = "Dell Inspiron 7720",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
+ },
+ },
+ {
+ .ident = "Dell Vostro 3360",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
+ },
+ },
+ {
+ .ident = "Dell XPS13 9333",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
+ },
+ },
+ {
+ .ident = "Dell XPS 15 L502X",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"),
+ },
+ },
+ { }
+};
+
+struct i8k_fan_control_data {
+ unsigned int manual_fan;
+ unsigned int auto_fan;
+};
+
+enum i8k_fan_controls {
+ I8K_FAN_34A3_35A3,
+};
+
+static const struct i8k_fan_control_data i8k_fan_control_data[] __initconst = {
+ [I8K_FAN_34A3_35A3] = {
+ .manual_fan = 0x34a3,
+ .auto_fan = 0x35a3,
+ },
+};
+
+static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
+ {
+ .ident = "Dell Latitude 5480",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell Latitude E6440",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell Latitude E7440",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell Precision 5530",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell Precision 7510",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ {
+ .ident = "Dell XPS 13 7390",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS 13 7390"),
+ },
+ .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
+ },
+ { }
+};
+
+static int __init dell_smm_probe(struct platform_device *pdev)
+{
+ struct dell_smm_data *data;
+ const struct dmi_system_id *id, *fan_control;
+ int ret;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ mutex_init(&data->i8k_mutex);
+ platform_set_drvdata(pdev, data);
+
+ if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
+ if (!force) {
+ dev_notice(&pdev->dev, "Disabling fan support due to BIOS bugs\n");
+ data->disallow_fan_support = true;
+ } else {
+ dev_warn(&pdev->dev, "Enabling fan support despite BIOS bugs\n");
+ }
+ }
+
+ if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
+ if (!force) {
+ dev_notice(&pdev->dev, "Disabling fan type call due to BIOS bugs\n");
+ data->disallow_fan_type_call = true;
+ } else {
+ dev_warn(&pdev->dev, "Enabling fan type call despite BIOS bugs\n");
+ }
+ }
+
+ strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
+ sizeof(data->bios_version));
+ strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+ sizeof(data->bios_machineid));
+
+ /*
+ * Set fan multiplier and maximal fan speed from dmi config
+ * Values specified in module parameters override values from dmi
+ */
+ id = dmi_first_match(i8k_dmi_table);
+ if (id && id->driver_data) {
+ const struct i8k_config_data *conf = id->driver_data;
+
+ if (!fan_mult && conf->fan_mult)
+ fan_mult = conf->fan_mult;
+
+ if (!fan_max && conf->fan_max)
+ fan_max = conf->fan_max;
+ }
+
+ /* All options must not be 0 */
+ data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;
+ data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
+ data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max);
+
+ fan_control = dmi_first_match(i8k_whitelist_fan_control);
+ if (fan_control && fan_control->driver_data) {
+ const struct i8k_fan_control_data *control = fan_control->driver_data;
+
+ data->manual_fan = control->manual_fan;
+ data->auto_fan = control->auto_fan;
+ dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n");
+ }
+
+ ret = dell_smm_init_hwmon(&pdev->dev);
+ if (ret)
+ return ret;
+
+ i8k_init_procfs(&pdev->dev);
+
+ return 0;
+}
+
+static struct platform_driver dell_smm_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+};
+
+static struct platform_device *dell_smm_device;
+
+/*
+ * Probe for the presence of a supported laptop.
+ */
+static int __init i8k_init(void)
+{
+ /*
+ * Get DMI information
+ */
+ if (!dmi_check_system(i8k_dmi_table)) {
+ if (!ignore_dmi && !force)
+ return -ENODEV;
+
+ pr_info("not running on a supported Dell system.\n");
+ pr_info("vendor=%s, model=%s, version=%s\n",
+ i8k_get_dmi_data(DMI_SYS_VENDOR),
+ i8k_get_dmi_data(DMI_PRODUCT_NAME),
+ i8k_get_dmi_data(DMI_BIOS_VERSION));
+ }
+
+ /*
+ * Get SMM Dell signature
+ */
+ if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
+ i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
+ pr_err("unable to get SMM Dell signature\n");
+ if (!force)
+ return -ENODEV;
+ }
+
+ dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL,
+ 0);
+
+ return PTR_ERR_OR_ZERO(dell_smm_device);
+}
+
+static void __exit i8k_exit(void)
+{
+ platform_device_unregister(dell_smm_device);
+ platform_driver_unregister(&dell_smm_driver);
+}
+
+module_init(i8k_init);
+module_exit(i8k_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 14:27:58 +0000