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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/i8k.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/char/i8k.c')
-rw-r--r-- | drivers/char/i8k.c | 788 |
1 files changed, 788 insertions, 0 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c new file mode 100644 index 0000000..a811976 --- /dev/null +++ b/drivers/char/i8k.c @@ -0,0 +1,788 @@ +/* + * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops. + * See http://www.debian.org/~dz/i8k/ for more information + * and for latest version of this driver. + * + * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> + * + * 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. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/apm_bios.h> +#include <asm/uaccess.h> +#include <asm/io.h> + +#include <linux/i8k.h> + +#define I8K_VERSION "1.13 14/05/2002" + +#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_TEMP 0x10a3 +#define I8K_SMM_GET_DELL_SIG 0xffa3 +#define I8K_SMM_BIOS_VERSION 0x00a6 + +#define I8K_FAN_MULT 30 +#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 I8K_TEMPERATURE_BUG 1 + +#define DELL_SIGNATURE "Dell Computer" + +static char *supported_models[] = { + "Inspiron", + "Latitude", + NULL +}; + +static char system_vendor[48] = "?"; +static char product_name [48] = "?"; +static char bios_version [4] = "?"; +static char serial_number[16] = "?"; + +MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); +MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops"); +MODULE_LICENSE("GPL"); + +static int force; +module_param(force, bool, 0); +MODULE_PARM_DESC(force, "Force loading without checking for supported models"); + +static int restricted; +module_param(restricted, bool, 0); +MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set"); + +static int power_status; +module_param(power_status, bool, 0600); +MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k"); + +static ssize_t i8k_read(struct file *, char __user *, size_t, loff_t *); +static int i8k_ioctl(struct inode *, struct file *, unsigned int, + unsigned long); + +static struct file_operations i8k_fops = { + .read = i8k_read, + .ioctl = i8k_ioctl, +}; + +typedef struct { + unsigned int eax; + unsigned int ebx __attribute__ ((packed)); + unsigned int ecx __attribute__ ((packed)); + unsigned int edx __attribute__ ((packed)); + unsigned int esi __attribute__ ((packed)); + unsigned int edi __attribute__ ((packed)); +} SMMRegisters; + +typedef struct { + u8 type; + u8 length; + u16 handle; +} DMIHeader; + +/* + * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. + */ +static int i8k_smm(SMMRegisters *regs) +{ + int rc; + int eax = regs->eax; + + asm("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"); + + if ((rc != 0) || ((regs->eax & 0xffff) == 0xffff) || (regs->eax == eax)) { + return -EINVAL; + } + + return 0; +} + +/* + * Read the bios version. Return the version as an integer corresponding + * to the ascii value, for example "A17" is returned as 0x00413137. + */ +static int i8k_get_bios_version(void) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_BIOS_VERSION; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + return regs.eax; +} + +/* + * Read the machine id. + */ +static int i8k_get_serial_number(unsigned char *buff) +{ + strlcpy(buff, serial_number, sizeof(serial_number)); + return 0; +} + +/* + * Read the Fn key status. + */ +static int i8k_get_fn_status(void) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_FN_STATUS; + if ((rc=i8k_smm(®s)) < 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) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_POWER_STATUS; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + switch (regs.eax & 0xff) { + case I8K_POWER_AC: + return I8K_AC; + default: + return I8K_BATTERY; + } +} + +/* + * Read the fan status. + */ +static int i8k_get_fan_status(int fan) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_GET_FAN; + regs.ebx = fan & 0xff; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + return (regs.eax & 0xff); +} + +/* + * Read the fan speed in RPM. + */ +static int i8k_get_fan_speed(int fan) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_GET_SPEED; + regs.ebx = fan & 0xff; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + return (regs.eax & 0xffff) * I8K_FAN_MULT; +} + +/* + * Set the fan speed (off, low, high). Returns the new fan status. + */ +static int i8k_set_fan(int fan, int speed) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed); + + regs.eax = I8K_SMM_SET_FAN; + regs.ebx = (fan & 0xff) | (speed << 8); + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + return (i8k_get_fan_status(fan)); +} + +/* + * Read the cpu temperature. + */ +static int i8k_get_cpu_temp(void) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + int temp; + +#ifdef I8K_TEMPERATURE_BUG + static int prev = 0; +#endif + + regs.eax = I8K_SMM_GET_TEMP; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + temp = regs.eax & 0xff; + +#ifdef I8K_TEMPERATURE_BUG + /* + * Sometimes the temperature sensor returns 0x99, which is out of range. + * In this case we return (once) the previous cached value. For example: + # 1003655137 00000058 00005a4b + # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees + # 1003655139 00000054 00005c52 + */ + if (temp > I8K_MAX_TEMP) { + temp = prev; + prev = I8K_MAX_TEMP; + } else { + prev = temp; + } +#endif + + return temp; +} + +static int i8k_get_dell_signature(void) +{ + SMMRegisters regs = { 0, 0, 0, 0, 0, 0 }; + int rc; + + regs.eax = I8K_SMM_GET_DELL_SIG; + if ((rc=i8k_smm(®s)) < 0) { + return rc; + } + + if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) { + return 0; + } else { + return -1; + } +} + +static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd, + unsigned long arg) +{ + int val; + int speed; + unsigned char buff[16]; + int __user *argp = (int __user *)arg; + + if (!argp) + return -EINVAL; + + switch (cmd) { + case I8K_BIOS_VERSION: + val = i8k_get_bios_version(); + break; + + case I8K_MACHINE_ID: + memset(buff, 0, 16); + val = i8k_get_serial_number(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_cpu_temp(); + 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; + } + val = i8k_set_fan(val, speed); + 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; +} + +/* + * Print the information for /proc/i8k. + */ +static int i8k_get_info(char *buffer, char **start, off_t fpos, int length) +{ + int n, fn_key, cpu_temp, ac_power; + int left_fan, right_fan, left_speed, right_speed; + + cpu_temp = i8k_get_cpu_temp(); /* 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 + */ + n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %d\n", + I8K_PROC_FMT, + bios_version, + serial_number, + cpu_temp, + left_fan, + right_fan, + left_speed, + right_speed, + ac_power, + fn_key); + + return n; +} + +static ssize_t i8k_read(struct file *f, char __user *buffer, size_t len, loff_t *fpos) +{ + int n; + char info[128]; + + n = i8k_get_info(info, NULL, 0, 128); + if (n <= 0) { + return n; + } + + if (*fpos >= n) { + return 0; + } + + if ((*fpos + len) >= n) { + len = n - *fpos; + } + + if (copy_to_user(buffer, info, len) != 0) { + return -EFAULT; + } + + *fpos += len; + return len; +} + +static char* __init string_trim(char *s, int size) +{ + int len; + char *p; + + if ((len = strlen(s)) > size) { + len = size; + } + + for (p=s+len-1; len && (*p==' '); len--,p--) { + *p = '\0'; + } + + return s; +} + +/* DMI code, stolen from arch/i386/kernel/dmi_scan.c */ + +/* + * |<-- dmi->length -->| + * | | + * |dmi header s=N | string1,\0, ..., stringN,\0, ..., \0 + * | | + * +-----------------------+ + */ +static char* __init dmi_string(DMIHeader *dmi, u8 s) +{ + u8 *p; + + if (!s) { + return ""; + } + s--; + + p = (u8 *)dmi + dmi->length; + while (s > 0) { + p += strlen(p); + p++; + s--; + } + + return p; +} + +static void __init dmi_decode(DMIHeader *dmi) +{ + u8 *data = (u8 *) dmi; + char *p; + +#ifdef I8K_DEBUG + int i; + printk("%08x ", (int)data); + for (i=0; i<data[1] && i<64; i++) { + printk("%02x ", data[i]); + } + printk("\n"); +#endif + + switch (dmi->type) { + case 0: /* BIOS Information */ + p = dmi_string(dmi,data[5]); + if (*p) { + strlcpy(bios_version, p, sizeof(bios_version)); + string_trim(bios_version, sizeof(bios_version)); + } + break; + case 1: /* System Information */ + p = dmi_string(dmi,data[4]); + if (*p) { + strlcpy(system_vendor, p, sizeof(system_vendor)); + string_trim(system_vendor, sizeof(system_vendor)); + } + p = dmi_string(dmi,data[5]); + if (*p) { + strlcpy(product_name, p, sizeof(product_name)); + string_trim(product_name, sizeof(product_name)); + } + p = dmi_string(dmi,data[7]); + if (*p) { + strlcpy(serial_number, p, sizeof(serial_number)); + string_trim(serial_number, sizeof(serial_number)); + } + break; + } +} + +static int __init dmi_table(u32 base, int len, int num, void (*fn)(DMIHeader*)) +{ + u8 *buf; + u8 *data; + DMIHeader *dmi; + int i = 1; + + buf = ioremap(base, len); + if (buf == NULL) { + return -1; + } + data = buf; + + /* + * Stop when we see al the items the table claimed to have + * or we run off the end of the table (also happens) + */ + while ((i<num) && ((data-buf) < len)) { + dmi = (DMIHeader *)data; + /* + * Avoid misparsing crud if the length of the last + * record is crap + */ + if ((data-buf+dmi->length) >= len) { + break; + } + fn(dmi); + data += dmi->length; + /* + * Don't go off the end of the data if there is + * stuff looking like string fill past the end + */ + while (((data-buf) < len) && (*data || data[1])) { + data++; + } + data += 2; + i++; + } + iounmap(buf); + + return 0; +} + +static int __init dmi_iterate(void (*decode)(DMIHeader *)) +{ + unsigned char buf[20]; + void __iomem *p = ioremap(0xe0000, 0x20000), *q; + + if (!p) + return -1; + + for (q = p; q < p + 0x20000; q += 16) { + memcpy_fromio(buf, q, 20); + if (memcmp(buf, "_DMI_", 5)==0) { + u16 num = buf[13]<<8 | buf[12]; + u16 len = buf [7]<<8 | buf [6]; + u32 base = buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]; +#ifdef I8K_DEBUG + printk(KERN_INFO "DMI %d.%d present.\n", + buf[14]>>4, buf[14]&0x0F); + printk(KERN_INFO "%d structures occupying %d bytes.\n", + buf[13]<<8 | buf[12], + buf [7]<<8 | buf[6]); + printk(KERN_INFO "DMI table at 0x%08X.\n", + buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]); +#endif + if (dmi_table(base, len, num, decode)==0) { + iounmap(p); + return 0; + } + } + } + iounmap(p); + return -1; +} +/* end of DMI code */ + +/* + * Get DMI information. + */ +static int __init i8k_dmi_probe(void) +{ + char **p; + + if (dmi_iterate(dmi_decode) != 0) { + printk(KERN_INFO "i8k: unable to get DMI information\n"); + return -ENODEV; + } + + if (strncmp(system_vendor,DELL_SIGNATURE,strlen(DELL_SIGNATURE)) != 0) { + printk(KERN_INFO "i8k: not running on a Dell system\n"); + return -ENODEV; + } + + for (p=supported_models; ; p++) { + if (!*p) { + printk(KERN_INFO "i8k: unsupported model: %s\n", product_name); + return -ENODEV; + } + if (strncmp(product_name,*p,strlen(*p)) == 0) { + break; + } + } + + return 0; +} + +/* + * Probe for the presence of a supported laptop. + */ +static int __init i8k_probe(void) +{ + char buff[4]; + int version; + int smm_found = 0; + + /* + * Get DMI information + */ + if (i8k_dmi_probe() != 0) { + printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n", + system_vendor, product_name, bios_version); + } + + /* + * Get SMM Dell signature + */ + if (i8k_get_dell_signature() != 0) { + printk(KERN_INFO "i8k: unable to get SMM Dell signature\n"); + } else { + smm_found = 1; + } + + /* + * Get SMM BIOS version. + */ + version = i8k_get_bios_version(); + if (version <= 0) { + printk(KERN_INFO "i8k: unable to get SMM BIOS version\n"); + } else { + smm_found = 1; + buff[0] = (version >> 16) & 0xff; + buff[1] = (version >> 8) & 0xff; + buff[2] = (version) & 0xff; + buff[3] = '\0'; + /* + * If DMI BIOS version is unknown use SMM BIOS version. + */ + if (bios_version[0] == '?') { + strcpy(bios_version, buff); + } + /* + * Check if the two versions match. + */ + if (strncmp(buff,bios_version,sizeof(bios_version)) != 0) { + printk(KERN_INFO "i8k: BIOS version mismatch: %s != %s\n", + buff, bios_version); + } + } + + if (!smm_found && !force) { + return -ENODEV; + } + + return 0; +} + +#ifdef MODULE +static +#endif +int __init i8k_init(void) +{ + struct proc_dir_entry *proc_i8k; + + /* Are we running on an supported laptop? */ + if (i8k_probe() != 0) { + return -ENODEV; + } + + /* Register the proc entry */ + proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info); + if (!proc_i8k) { + return -ENOENT; + } + proc_i8k->proc_fops = &i8k_fops; + proc_i8k->owner = THIS_MODULE; + + printk(KERN_INFO + "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n", + I8K_VERSION); + + return 0; +} + +#ifdef MODULE +int init_module(void) +{ + return i8k_init(); +} + +void cleanup_module(void) +{ + /* Remove the proc entry */ + remove_proc_entry("i8k", NULL); + + printk(KERN_INFO "i8k: module unloaded\n"); +} +#endif + +/* end of file */ |