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-rw-r--r--drivers/hwmon/dell-smm-hwmon.c1203
1 files changed, 1203 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..a5bca3bbe
--- /dev/null
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -0,0 +1,1203 @@
+/*
+ * 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.rohar@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/dmi.h>
+#include <linux/capability.h>
+#include <linux/mutex.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/ctype.h>
+#include <linux/smp.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
+
+#define I8K_FAN_MULT 30
+#define I8K_FAN_MAX_RPM 30000
+#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
+
+static DEFINE_MUTEX(i8k_mutex);
+static char bios_version[4];
+static char bios_machineid[16];
+static struct device *i8k_hwmon_dev;
+static u32 i8k_hwmon_flags;
+static uint i8k_fan_mult = I8K_FAN_MULT;
+static uint i8k_pwm_mult;
+static uint i8k_fan_max = I8K_FAN_HIGH;
+static bool disallow_fan_type_call;
+static bool disallow_fan_support;
+
+#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
+#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
+#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
+#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
+#define I8K_HWMON_HAVE_FAN1 (1 << 4)
+#define I8K_HWMON_HAVE_FAN2 (1 << 5)
+#define I8K_HWMON_HAVE_FAN3 (1 << 6)
+
+MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
+MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i8k");
+
+static bool force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Force loading without checking for supported models");
+
+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 __packed;
+ unsigned int ecx __packed;
+ unsigned int edx __packed;
+ unsigned int esi __packed;
+ unsigned int edi __packed;
+};
+
+static inline const char *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)
+{
+ int rc;
+ struct smm_regs *regs = par;
+ int eax = regs->eax;
+
+#ifdef DEBUG
+ int ebx = regs->ebx;
+ unsigned long duration;
+ ktime_t calltime, delta, rettime;
+
+ calltime = ktime_get();
+#endif
+
+ /* SMM requires CPU 0 */
+ if (smp_processor_id() != 0)
+ return -EBUSY;
+
+#if defined(CONFIG_X86_64)
+ asm volatile("pushq %%rax\n\t"
+ "movl 0(%%rax),%%edx\n\t"
+ "pushq %%rdx\n\t"
+ "movl 4(%%rax),%%ebx\n\t"
+ "movl 8(%%rax),%%ecx\n\t"
+ "movl 12(%%rax),%%edx\n\t"
+ "movl 16(%%rax),%%esi\n\t"
+ "movl 20(%%rax),%%edi\n\t"
+ "popq %%rax\n\t"
+ "out %%al,$0xb2\n\t"
+ "out %%al,$0x84\n\t"
+ "xchgq %%rax,(%%rsp)\n\t"
+ "movl %%ebx,4(%%rax)\n\t"
+ "movl %%ecx,8(%%rax)\n\t"
+ "movl %%edx,12(%%rax)\n\t"
+ "movl %%esi,16(%%rax)\n\t"
+ "movl %%edi,20(%%rax)\n\t"
+ "popq %%rdx\n\t"
+ "movl %%edx,0(%%rax)\n\t"
+ "pushfq\n\t"
+ "popq %%rax\n\t"
+ "andl $1,%%eax\n"
+ : "=a"(rc)
+ : "a"(regs)
+ : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
+#else
+ asm volatile("pushl %%eax\n\t"
+ "movl 0(%%eax),%%edx\n\t"
+ "push %%edx\n\t"
+ "movl 4(%%eax),%%ebx\n\t"
+ "movl 8(%%eax),%%ecx\n\t"
+ "movl 12(%%eax),%%edx\n\t"
+ "movl 16(%%eax),%%esi\n\t"
+ "movl 20(%%eax),%%edi\n\t"
+ "popl %%eax\n\t"
+ "out %%al,$0xb2\n\t"
+ "out %%al,$0x84\n\t"
+ "xchgl %%eax,(%%esp)\n\t"
+ "movl %%ebx,4(%%eax)\n\t"
+ "movl %%ecx,8(%%eax)\n\t"
+ "movl %%edx,12(%%eax)\n\t"
+ "movl %%esi,16(%%eax)\n\t"
+ "movl %%edi,20(%%eax)\n\t"
+ "popl %%edx\n\t"
+ "movl %%edx,0(%%eax)\n\t"
+ "lahf\n\t"
+ "shrl $8,%%eax\n\t"
+ "andl $1,%%eax\n"
+ : "=a"(rc)
+ : "a"(regs)
+ : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
+#endif
+ if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
+ rc = -EINVAL;
+
+#ifdef DEBUG
+ rettime = ktime_get();
+ delta = ktime_sub(rettime, calltime);
+ duration = ktime_to_ns(delta) >> 10;
+ pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
+ (rc ? 0xffff : regs->eax & 0xffff), duration);
+#endif
+
+ return rc;
+}
+
+/*
+ * Call the System Management Mode BIOS.
+ */
+static int i8k_smm(struct smm_regs *regs)
+{
+ int ret;
+
+ get_online_cpus();
+ ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
+ put_online_cpus();
+
+ return ret;
+}
+
+/*
+ * Read the fan status.
+ */
+static int i8k_get_fan_status(int fan)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
+
+ if (disallow_fan_support)
+ return -EINVAL;
+
+ regs.ebx = fan & 0xff;
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+/*
+ * Read the fan speed in RPM.
+ */
+static int i8k_get_fan_speed(int fan)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
+
+ if (disallow_fan_support)
+ return -EINVAL;
+
+ regs.ebx = fan & 0xff;
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
+}
+
+/*
+ * Read the fan type.
+ */
+static int _i8k_get_fan_type(int fan)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
+
+ if (disallow_fan_support || disallow_fan_type_call)
+ return -EINVAL;
+
+ regs.ebx = fan & 0xff;
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+static int i8k_get_fan_type(int fan)
+{
+ /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
+ static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
+
+ if (types[fan] == INT_MIN)
+ types[fan] = _i8k_get_fan_type(fan);
+
+ return types[fan];
+}
+
+/*
+ * Read the fan nominal rpm for specific fan speed.
+ */
+static int i8k_get_fan_nominal_speed(int fan, int speed)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
+
+ if (disallow_fan_support)
+ return -EINVAL;
+
+ regs.ebx = (fan & 0xff) | (speed << 8);
+ return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
+}
+
+/*
+ * Set the fan speed (off, low, high, ...).
+ */
+static int i8k_set_fan(int fan, int speed)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
+
+ if (disallow_fan_support)
+ return -EINVAL;
+
+ speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
+ regs.ebx = (fan & 0xff) | (speed << 8);
+
+ return i8k_smm(&regs);
+}
+
+static int i8k_get_temp_type(int sensor)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
+
+ regs.ebx = sensor & 0xff;
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+/*
+ * Read the cpu temperature.
+ */
+static int _i8k_get_temp(int sensor)
+{
+ struct smm_regs regs = {
+ .eax = I8K_SMM_GET_TEMP,
+ .ebx = sensor & 0xff,
+ };
+
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
+static int i8k_get_temp(int 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 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 int
+i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+ int val = 0;
+ int speed, err;
+ unsigned char buff[16];
+ int __user *argp = (int __user *)arg;
+
+ if (!argp)
+ return -EINVAL;
+
+ switch (cmd) {
+ case I8K_BIOS_VERSION:
+ if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
+ !isdigit(bios_version[2]))
+ return -EINVAL;
+
+ val = (bios_version[0] << 16) |
+ (bios_version[1] << 8) | bios_version[2];
+ break;
+
+ case I8K_MACHINE_ID:
+ if (restricted && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ memset(buff, 0, sizeof(buff));
+ strlcpy(buff, bios_machineid, sizeof(buff));
+ break;
+
+ 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;
+
+ val = i8k_get_fan_speed(val);
+ break;
+
+ case I8K_GET_FAN:
+ if (copy_from_user(&val, argp, sizeof(int)))
+ return -EFAULT;
+
+ val = i8k_get_fan_status(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 (copy_from_user(&speed, argp + 1, sizeof(int)))
+ return -EFAULT;
+
+ err = i8k_set_fan(val, speed);
+ if (err < 0)
+ return err;
+
+ val = i8k_get_fan_status(val);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (val < 0)
+ return val;
+
+ switch (cmd) {
+ case I8K_BIOS_VERSION:
+ if (copy_to_user(argp, &val, 4))
+ return -EFAULT;
+
+ break;
+ case I8K_MACHINE_ID:
+ if (copy_to_user(argp, buff, 16))
+ return -EFAULT;
+
+ break;
+ default:
+ if (copy_to_user(argp, &val, sizeof(int)))
+ return -EFAULT;
+
+ break;
+ }
+
+ return 0;
+}
+
+static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+ long ret;
+
+ mutex_lock(&i8k_mutex);
+ ret = i8k_ioctl_unlocked(fp, cmd, arg);
+ mutex_unlock(&i8k_mutex);
+
+ return ret;
+}
+
+/*
+ * Print the information for /proc/i8k.
+ */
+static int i8k_proc_show(struct seq_file *seq, void *offset)
+{
+ 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(I8K_FAN_LEFT); /* 580 µs */
+ right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
+ left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
+ right_speed = i8k_get_fan_speed(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,
+ bios_version,
+ (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : 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, NULL);
+}
+
+static const struct file_operations i8k_fops = {
+ .owner = THIS_MODULE,
+ .open = i8k_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .unlocked_ioctl = i8k_ioctl,
+};
+
+static struct proc_dir_entry *entry;
+
+static void __init i8k_init_procfs(void)
+{
+ /* Register the proc entry */
+ entry = proc_create("i8k", 0, NULL, &i8k_fops);
+}
+
+static void __exit i8k_exit_procfs(void)
+{
+ if (entry)
+ remove_proc_entry("i8k", NULL);
+}
+
+#else
+
+static inline void __init i8k_init_procfs(void)
+{
+}
+
+static inline void __exit i8k_exit_procfs(void)
+{
+}
+
+#endif
+
+/*
+ * Hwmon interface
+ */
+
+static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ static const char * const labels[] = {
+ "CPU",
+ "GPU",
+ "SODIMM",
+ "Other",
+ "Ambient",
+ "Other",
+ };
+ int index = to_sensor_dev_attr(devattr)->index;
+ int type;
+
+ type = i8k_get_temp_type(index);
+ if (type < 0)
+ return type;
+ if (type >= ARRAY_SIZE(labels))
+ type = ARRAY_SIZE(labels) - 1;
+ return sprintf(buf, "%s\n", labels[type]);
+}
+
+static ssize_t i8k_hwmon_show_temp(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ int temp;
+
+ temp = i8k_get_temp(index);
+ if (temp < 0)
+ return temp;
+ return sprintf(buf, "%d\n", temp * 1000);
+}
+
+static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ static const char * const labels[] = {
+ "Processor Fan",
+ "Motherboard Fan",
+ "Video Fan",
+ "Power Supply Fan",
+ "Chipset Fan",
+ "Other Fan",
+ };
+ int index = to_sensor_dev_attr(devattr)->index;
+ bool dock = false;
+ int type;
+
+ type = i8k_get_fan_type(index);
+ if (type < 0)
+ return type;
+
+ if (type & 0x10) {
+ dock = true;
+ type &= 0x0F;
+ }
+
+ if (type >= ARRAY_SIZE(labels))
+ type = (ARRAY_SIZE(labels) - 1);
+
+ return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
+}
+
+static ssize_t i8k_hwmon_show_fan(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ int fan_speed;
+
+ fan_speed = i8k_get_fan_speed(index);
+ if (fan_speed < 0)
+ return fan_speed;
+ return sprintf(buf, "%d\n", fan_speed);
+}
+
+static ssize_t i8k_hwmon_show_pwm(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ int status;
+
+ status = i8k_get_fan_status(index);
+ if (status < 0)
+ return -EIO;
+ return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
+}
+
+static ssize_t i8k_hwmon_set_pwm(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int index = to_sensor_dev_attr(attr)->index;
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+ val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
+
+ mutex_lock(&i8k_mutex);
+ err = i8k_set_fan(index, val);
+ mutex_unlock(&i8k_mutex);
+
+ return err < 0 ? -EIO : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
+ 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
+ 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
+ 2);
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
+ 3);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
+ 0);
+static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, 0);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ 1);
+static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
+ 1);
+static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, 1);
+static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ 2);
+static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
+ 2);
+static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
+ i8k_hwmon_set_pwm, 2);
+
+static struct attribute *i8k_attrs[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
+ &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
+ &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
+ &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
+ &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
+ &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
+ &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
+ &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
+ &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
+ &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
+ &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
+ &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
+ &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
+ &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
+ &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */
+ &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */
+ &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */
+ NULL
+};
+
+static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
+ int index)
+{
+ if (disallow_fan_support && index >= 8)
+ return 0;
+ if (disallow_fan_type_call &&
+ (index == 9 || index == 12 || index == 15))
+ return 0;
+ if (index >= 0 && index <= 1 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
+ return 0;
+ if (index >= 2 && index <= 3 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
+ return 0;
+ if (index >= 4 && index <= 5 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
+ return 0;
+ if (index >= 6 && index <= 7 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
+ return 0;
+ if (index >= 8 && index <= 10 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
+ return 0;
+ if (index >= 11 && index <= 13 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
+ return 0;
+ if (index >= 14 && index <= 16 &&
+ !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
+ return 0;
+
+ return attr->mode;
+}
+
+static const struct attribute_group i8k_group = {
+ .attrs = i8k_attrs,
+ .is_visible = i8k_is_visible,
+};
+__ATTRIBUTE_GROUPS(i8k);
+
+static int __init i8k_init_hwmon(void)
+{
+ int err;
+
+ i8k_hwmon_flags = 0;
+
+ /* CPU temperature attributes, if temperature type is OK */
+ err = i8k_get_temp_type(0);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
+ /* check for additional temperature sensors */
+ err = i8k_get_temp_type(1);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
+ err = i8k_get_temp_type(2);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
+ err = i8k_get_temp_type(3);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
+
+ /* First fan attributes, if fan status or type is OK */
+ err = i8k_get_fan_status(0);
+ if (err < 0)
+ err = i8k_get_fan_type(0);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
+
+ /* Second fan attributes, if fan status or type is OK */
+ err = i8k_get_fan_status(1);
+ if (err < 0)
+ err = i8k_get_fan_type(1);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
+
+ /* Third fan attributes, if fan status or type is OK */
+ err = i8k_get_fan_status(2);
+ if (err < 0)
+ err = i8k_get_fan_type(2);
+ if (err >= 0)
+ i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
+
+ i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
+ NULL, i8k_groups);
+ if (IS_ERR(i8k_hwmon_dev)) {
+ err = PTR_ERR(i8k_hwmon_dev);
+ i8k_hwmon_dev = NULL;
+ pr_err("hwmon registration failed (%d)\n", err);
+ return err;
+ }
+ return 0;
+}
+
+struct i8k_config_data {
+ uint fan_mult;
+ uint fan_max;
+};
+
+enum i8k_configs {
+ DELL_LATITUDE_D520,
+ DELL_PRECISION_490,
+ DELL_STUDIO,
+ DELL_XPS,
+};
+
+static const struct i8k_config_data i8k_config_data[] = {
+ [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 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 XPS421",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
+ },
+ },
+ {
+ .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 13",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
+ },
+ .driver_data = (void *)&i8k_config_data[DELL_XPS],
+ },
+ {
+ .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 15 9560",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
+ },
+ },
+ { }
+};
+
+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 "),
+ },
+ },
+ { }
+};
+
+/*
+ * 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 struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
+ {
+ .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"),
+ },
+ },
+ { }
+};
+
+/*
+ * Probe for the presence of a supported laptop.
+ */
+static int __init i8k_probe(void)
+{
+ const struct dmi_system_id *id;
+ int fan, ret;
+
+ /*
+ * 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));
+ }
+
+ if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
+ pr_warn("broken Dell BIOS detected, disallow fan support\n");
+ if (!force)
+ disallow_fan_support = true;
+ }
+
+ if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
+ pr_warn("broken Dell BIOS detected, disallow fan type call\n");
+ if (!force)
+ disallow_fan_type_call = true;
+ }
+
+ strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
+ sizeof(bios_version));
+ strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+ sizeof(bios_machineid));
+
+ /*
+ * 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;
+ }
+
+ /*
+ * 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;
+ }
+
+ i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
+ i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
+
+ if (!fan_mult) {
+ /*
+ * Autodetect fan multiplier based on nominal rpm
+ * If fan reports rpm value too high then set multiplier to 1
+ */
+ for (fan = 0; fan < 2; ++fan) {
+ ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
+ if (ret < 0)
+ continue;
+ if (ret > I8K_FAN_MAX_RPM)
+ i8k_fan_mult = 1;
+ break;
+ }
+ } else {
+ /* Fan multiplier was specified in module param or in dmi */
+ i8k_fan_mult = fan_mult;
+ }
+
+ return 0;
+}
+
+static int __init i8k_init(void)
+{
+ int err;
+
+ /* Are we running on an supported laptop? */
+ if (i8k_probe())
+ return -ENODEV;
+
+ err = i8k_init_hwmon();
+ if (err)
+ return err;
+
+ i8k_init_procfs();
+ return 0;
+}
+
+static void __exit i8k_exit(void)
+{
+ hwmon_device_unregister(i8k_hwmon_dev);
+ i8k_exit_procfs();
+}
+
+module_init(i8k_init);
+module_exit(i8k_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 05:18:15 +0000