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!

1 files changed, 788 insertions, 0 deletions

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
new file mode 100644
index 000000000000..a81197640283
--- /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(&regs)) < 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(&regs)) < 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(&regs)) < 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(&regs)) < 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(&regs)) < 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(&regs)) < 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(&regs)) < 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(&regs)) < 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 */