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, 1242 insertions, 0 deletions

diff --git a/drivers/acpi/ibm_acpi.c b/drivers/acpi/ibm_acpi.c
new file mode 100644
index 000000000000..0fb731a470dc
--- /dev/null
+++ b/drivers/acpi/ibm_acpi.c
@@ -0,0 +1,1242 @@
+/*
+ *  ibm_acpi.c - IBM ThinkPad ACPI Extras
+ *
+ *
+ *  Copyright (C) 2004 Borislav Deianov
+ *
+ *  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 of the License, 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  Changelog:
+ *
+ *  2004-08-09	0.1	initial release, support for X series
+ *  2004-08-14	0.2	support for T series, X20
+ *			bluetooth enable/disable
+ *			hotkey events disabled by default
+ *			removed fan control, currently useless
+ *  2004-08-17	0.3	support for R40
+ *			lcd off, brightness control
+ *			thinklight on/off
+ *  2004-09-16	0.4	support for module parameters
+ *			hotkey mask can be prefixed by 0x
+ *			video output switching
+ *			video expansion control
+ *			ultrabay eject support
+ *			removed lcd brightness/on/off control, didn't work
+ *  2004-10-18	0.5	thinklight support on A21e, G40, R32, T20, T21, X20
+ *			proc file format changed
+ *			video_switch command
+ *			experimental cmos control
+ *			experimental led control
+ *			experimental acpi sounds
+ *  2004-10-19	0.6	use acpi_bus_register_driver() to claim HKEY device
+ *  2004-10-23	0.7	fix module loading on A21e, A22p, T20, T21, X20
+ *			fix LED control on A21e
+ *  2004-11-08	0.8	fix init error case, don't return from a macro
+ *				thanks to Chris Wright <chrisw@osdl.org>
+ */
+
+#define IBM_VERSION "0.8"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <asm/uaccess.h>
+
+#include <acpi/acpi_drivers.h>
+#include <acpi/acnamesp.h>
+
+#define IBM_NAME "ibm"
+#define IBM_DESC "IBM ThinkPad ACPI Extras"
+#define IBM_FILE "ibm_acpi"
+#define IBM_URL "http://ibm-acpi.sf.net/"
+
+#define IBM_DIR IBM_NAME
+
+#define IBM_LOG IBM_FILE ": "
+#define IBM_ERR	   KERN_ERR    IBM_LOG
+#define IBM_NOTICE KERN_NOTICE IBM_LOG
+#define IBM_INFO   KERN_INFO   IBM_LOG
+#define IBM_DEBUG  KERN_DEBUG  IBM_LOG
+
+#define IBM_MAX_ACPI_ARGS 3
+
+#define __unused __attribute__ ((unused))
+
+static int experimental;
+module_param(experimental, int, 0);
+
+static acpi_handle root_handle = NULL;
+
+#define IBM_HANDLE(object, parent, paths...)			\
+	static acpi_handle  object##_handle;			\
+	static acpi_handle *object##_parent = &parent##_handle;	\
+	static char        *object##_paths[] = { paths }
+
+IBM_HANDLE(ec, root,
+	   "\\_SB.PCI0.ISA.EC",    /* A21e, A22p, T20, T21, X20 */
+	   "\\_SB.PCI0.LPC.EC",    /* all others */
+);
+
+IBM_HANDLE(vid, root, 
+	   "\\_SB.PCI0.VID",       /* A21e, G40, X30, X40 */
+	   "\\_SB.PCI0.AGP.VID",   /* all others */
+);
+
+IBM_HANDLE(cmos, root,
+	   "\\UCMS",               /* R50, R50p, R51, T4x, X31, X40 */
+	   "\\CMOS",               /* A3x, G40, R32, T23, T30, X22, X24, X30 */
+	   "\\CMS",                /* R40, R40e */
+);                                 /* A21e, A22p, T20, T21, X20 */
+
+IBM_HANDLE(dock, root,
+	   "\\_SB.GDCK",           /* X30, X31, X40 */
+	   "\\_SB.PCI0.DOCK",      /* A22p, T20, T21, X20 */
+	   "\\_SB.PCI0.PCI1.DOCK", /* all others */
+);                                 /* A21e, G40, R32, R40, R40e */
+
+IBM_HANDLE(bay, root,
+	   "\\_SB.PCI0.IDE0.SCND.MSTR");      /* all except A21e */
+IBM_HANDLE(bayej, root,
+	   "\\_SB.PCI0.IDE0.SCND.MSTR._EJ0"); /* all except A2x, A3x */
+
+IBM_HANDLE(lght, root, "\\LGHT");  /* A21e, A22p, T20, T21, X20 */
+IBM_HANDLE(hkey, ec,   "HKEY");    /* all */
+IBM_HANDLE(led,  ec,   "LED");     /* all except A21e, A22p, T20, T21, X20 */
+IBM_HANDLE(sysl, ec,   "SYSL");    /* A21e, A22p, T20, T21, X20 */
+IBM_HANDLE(bled, ec,   "BLED");    /* A22p, T20, T21, X20 */
+IBM_HANDLE(beep, ec,   "BEEP");    /* all models */
+
+struct ibm_struct {
+	char *name;
+
+	char *hid;
+	struct acpi_driver *driver;
+	
+	int  (*init)   (struct ibm_struct *);
+	int  (*read)   (struct ibm_struct *, char *);
+	int  (*write)  (struct ibm_struct *, char *);
+	void (*exit)   (struct ibm_struct *);
+
+	void (*notify) (struct ibm_struct *, u32);	
+	acpi_handle *handle;
+	int type;
+	struct acpi_device *device;
+
+	int driver_registered;
+	int proc_created;
+	int init_called;
+	int notify_installed;
+
+	int supported;
+	union {
+		struct {
+			int status;
+			int mask;
+		} hotkey;
+		struct {
+			int autoswitch;
+		} video;
+	} state;
+
+	int experimental;
+};
+
+static struct proc_dir_entry *proc_dir = NULL;
+
+#define onoff(status,bit) ((status) & (1 << (bit)) ? "on" : "off")
+#define enabled(status,bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
+#define strlencmp(a,b) (strncmp((a), (b), strlen(b)))
+
+static int acpi_evalf(acpi_handle handle,
+		      void *res, char *method, char *fmt, ...)
+{
+	char *fmt0 = fmt;
+        struct acpi_object_list	params;
+        union acpi_object	in_objs[IBM_MAX_ACPI_ARGS];
+        struct acpi_buffer	result;
+        union acpi_object	out_obj;
+        acpi_status		status;
+	va_list			ap;
+	char			res_type;
+	int			success;
+	int			quiet;
+
+	if (!*fmt) {
+		printk(IBM_ERR "acpi_evalf() called with empty format\n");
+		return 0;
+	}
+
+	if (*fmt == 'q') {
+		quiet = 1;
+		fmt++;
+	} else
+		quiet = 0;
+
+	res_type = *(fmt++);
+
+	params.count = 0;
+	params.pointer = &in_objs[0];
+
+	va_start(ap, fmt);
+	while (*fmt) {
+		char c = *(fmt++);
+		switch (c) {
+		case 'd':	/* int */
+			in_objs[params.count].integer.value = va_arg(ap, int);
+			in_objs[params.count++].type = ACPI_TYPE_INTEGER;
+			break;
+		/* add more types as needed */
+		default:
+			printk(IBM_ERR "acpi_evalf() called "
+			       "with invalid format character '%c'\n", c);
+			return 0;
+		}
+	}
+	va_end(ap);
+
+	result.length = sizeof(out_obj);
+	result.pointer = &out_obj;
+
+	status = acpi_evaluate_object(handle, method, &params, &result);
+
+	switch (res_type) {
+	case 'd':	/* int */
+		if (res)
+			*(int *)res = out_obj.integer.value;
+		success = status == AE_OK && out_obj.type == ACPI_TYPE_INTEGER;
+		break;
+	case 'v':	/* void */
+		success = status == AE_OK;
+		break;
+	/* add more types as needed */
+	default:
+		printk(IBM_ERR "acpi_evalf() called "
+		       "with invalid format character '%c'\n", res_type);
+		return 0;
+	}
+
+	if (!success && !quiet)
+		printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
+		       method, fmt0, status);
+
+	return success;
+}
+
+static void __unused acpi_print_int(acpi_handle handle, char *method)
+{
+	int i;
+
+	if (acpi_evalf(handle, &i, method, "d"))
+		printk(IBM_INFO "%s = 0x%x\n", method, i);
+	else
+		printk(IBM_ERR "error calling %s\n", method);
+}
+
+static char *next_cmd(char **cmds)
+{
+	char *start = *cmds;
+	char *end;
+
+	while ((end = strchr(start, ',')) && end == start)
+		start = end + 1;
+
+	if (!end)
+		return NULL;
+
+	*end = 0;
+	*cmds = end + 1;
+	return start;
+}
+
+static int driver_init(struct ibm_struct *ibm)
+{
+	printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
+	printk(IBM_INFO "%s\n", IBM_URL);
+
+	return 0;
+}
+
+static int driver_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+
+	len += sprintf(p + len, "driver:\t\t%s\n", IBM_DESC);
+	len += sprintf(p + len, "version:\t%s\n", IBM_VERSION);
+
+	return len;
+}
+
+static int hotkey_get(struct ibm_struct *ibm, int *status, int *mask)
+{
+	if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
+		return -EIO;
+	if (ibm->supported) {
+		if (!acpi_evalf(hkey_handle, mask, "DHKN", "qd"))
+			return -EIO;
+	} else {
+		*mask = ibm->state.hotkey.mask;
+	}
+	return 0;
+}
+
+static int hotkey_set(struct ibm_struct *ibm, int status, int mask)
+{
+	int i;
+
+	if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
+		return -EIO;
+
+	if (!ibm->supported)
+		return 0;
+
+	for (i=0; i<32; i++) {
+		int bit = ((1 << i) & mask) != 0;
+		if (!acpi_evalf(hkey_handle, NULL, "MHKM", "vdd", i+1, bit))
+			return -EIO;
+	}
+
+	return 0;
+}
+
+static int hotkey_init(struct ibm_struct *ibm)
+{
+	int ret;
+
+	ibm->supported = 1;
+	ret = hotkey_get(ibm,
+			 &ibm->state.hotkey.status,
+			 &ibm->state.hotkey.mask);
+	if (ret < 0) {
+		/* mask not supported on A21e, A22p, T20, T21, X20, X22, X24 */
+		ibm->supported = 0;
+		ret = hotkey_get(ibm,
+				 &ibm->state.hotkey.status,
+				 &ibm->state.hotkey.mask);
+	}
+
+	return ret;
+}	
+
+static int hotkey_read(struct ibm_struct *ibm, char *p)
+{
+	int status, mask;
+	int len = 0;
+
+	if (hotkey_get(ibm, &status, &mask) < 0)
+		return -EIO;
+
+	len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
+	if (ibm->supported) {
+		len += sprintf(p + len, "mask:\t\t0x%04x\n", mask);
+		len += sprintf(p + len,
+			       "commands:\tenable, disable, reset, <mask>\n");
+	} else {
+		len += sprintf(p + len, "mask:\t\tnot supported\n");
+		len += sprintf(p + len, "commands:\tenable, disable, reset\n");
+	}
+
+	return len;
+}
+
+static int hotkey_write(struct ibm_struct *ibm, char *buf)
+{
+	int status, mask;
+	char *cmd;
+	int do_cmd = 0;
+
+	if (hotkey_get(ibm, &status, &mask) < 0)
+		return -ENODEV;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "enable") == 0) {
+			status = 1;
+		} else if (strlencmp(cmd, "disable") == 0) {
+			status = 0;
+		} else if (strlencmp(cmd, "reset") == 0) {
+			status = ibm->state.hotkey.status;
+			mask   = ibm->state.hotkey.mask;
+		} else if (sscanf(cmd, "0x%x", &mask) == 1) {
+			/* mask set */
+		} else if (sscanf(cmd, "%x", &mask) == 1) {
+			/* mask set */
+		} else
+			return -EINVAL;
+		do_cmd = 1;
+	}
+
+	if (do_cmd && hotkey_set(ibm, status, mask) < 0)
+		return -EIO;
+
+	return 0;
+}	
+
+static void hotkey_exit(struct ibm_struct *ibm)
+{
+	hotkey_set(ibm, ibm->state.hotkey.status, ibm->state.hotkey.mask);
+}
+
+static void hotkey_notify(struct ibm_struct *ibm, u32 event)
+{
+	int hkey;
+
+	if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
+		acpi_bus_generate_event(ibm->device, event, hkey);
+	else {
+		printk(IBM_ERR "unknown hotkey event %d\n", event);
+		acpi_bus_generate_event(ibm->device, event, 0);
+	}	
+}
+
+static int bluetooth_init(struct ibm_struct *ibm)
+{
+	/* bluetooth not supported on A21e, G40, T20, T21, X20 */
+	ibm->supported = acpi_evalf(hkey_handle, NULL, "GBDC", "qv");
+
+	return 0;
+}
+
+static int bluetooth_status(struct ibm_struct *ibm)
+{
+	int status;
+
+	if (!ibm->supported || !acpi_evalf(hkey_handle, &status, "GBDC", "d"))
+		status = 0;
+
+	return status;
+}
+
+static int bluetooth_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+	int status = bluetooth_status(ibm);
+
+	if (!ibm->supported)
+		len += sprintf(p + len, "status:\t\tnot supported\n");
+	else if (!(status & 1))
+		len += sprintf(p + len, "status:\t\tnot installed\n");
+	else {
+		len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 1));
+		len += sprintf(p + len, "commands:\tenable, disable\n");
+	}
+
+	return len;
+}
+
+static int bluetooth_write(struct ibm_struct *ibm, char *buf)
+{
+	int status = bluetooth_status(ibm);
+	char *cmd;
+	int do_cmd = 0;
+
+	if (!ibm->supported)
+		return -EINVAL;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "enable") == 0) {
+			status |= 2;
+		} else if (strlencmp(cmd, "disable") == 0) {
+			status &= ~2;
+		} else
+			return -EINVAL;
+		do_cmd = 1;
+	}
+
+	if (do_cmd && !acpi_evalf(hkey_handle, NULL, "SBDC", "vd", status))
+	    return -EIO;
+
+	return 0;
+}
+
+static int video_init(struct ibm_struct *ibm)
+{
+	if (!acpi_evalf(vid_handle,
+			&ibm->state.video.autoswitch, "^VDEE", "d"))
+		return -ENODEV;
+
+	return 0;
+}
+
+static int video_status(struct ibm_struct *ibm)
+{
+	int status = 0;
+	int i;
+
+	acpi_evalf(NULL, NULL, "\\VUPS", "vd", 1);
+	if (acpi_evalf(NULL, &i, "\\VCDC", "d"))
+		status |= 0x02 * i;
+
+	acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0);
+	if (acpi_evalf(NULL, &i, "\\VCDL", "d"))
+		status |= 0x01 * i;
+	if (acpi_evalf(NULL, &i, "\\VCDD", "d"))
+		status |= 0x08 * i;
+
+	if (acpi_evalf(vid_handle, &i, "^VDEE", "d"))
+		status |= 0x10 * (i & 1);
+
+	return status;
+}
+
+static int video_read(struct ibm_struct *ibm, char *p)
+{
+	int status = video_status(ibm);
+	int len = 0;
+
+	len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
+	len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
+	len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
+	len += sprintf(p + len, "auto:\t\t%s\n", enabled(status, 4));
+	len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable, "
+		       "crt_enable, crt_disable\n");
+	len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable, "
+		       "auto_enable, auto_disable\n");
+	len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
+
+	return len;
+}
+
+static int video_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+	int enable, disable, status;
+
+	enable = disable = 0;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "lcd_enable") == 0) {
+			enable |= 0x01;
+		} else if (strlencmp(cmd, "lcd_disable") == 0) {
+			disable |= 0x01;
+		} else if (strlencmp(cmd, "crt_enable") == 0) {
+			enable |= 0x02;
+		} else if (strlencmp(cmd, "crt_disable") == 0) {
+			disable |= 0x02;
+		} else if (strlencmp(cmd, "dvi_enable") == 0) {
+			enable |= 0x08;
+		} else if (strlencmp(cmd, "dvi_disable") == 0) {
+			disable |= 0x08;
+		} else if (strlencmp(cmd, "auto_enable") == 0) {
+			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
+				return -EIO;
+		} else if (strlencmp(cmd, "auto_disable") == 0) {
+			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 0))
+				return -EIO;
+		} else if (strlencmp(cmd, "video_switch") == 0) {
+			int autoswitch;
+			if (!acpi_evalf(vid_handle, &autoswitch, "^VDEE", "d"))
+				return -EIO;
+			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", 1))
+				return -EIO;
+			if (!acpi_evalf(vid_handle, NULL, "VSWT", "v"))
+				return -EIO;
+			if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd",
+					autoswitch))
+				return -EIO;
+		} else if (strlencmp(cmd, "expand_toggle") == 0) {
+			if (!acpi_evalf(NULL, NULL, "\\VEXP", "v"))
+				return -EIO;
+		} else
+			return -EINVAL;
+	}
+
+	if (enable || disable) {
+		status = (video_status(ibm) & 0x0f & ~disable) | enable;
+		if (!acpi_evalf(NULL, NULL, "\\VUPS", "vd", 0x80))
+			return -EIO;
+		if (!acpi_evalf(NULL, NULL, "\\VSDS", "vdd", status, 1))
+			return -EIO;
+	}
+
+	return 0;
+}
+
+static void video_exit(struct ibm_struct *ibm)
+{
+	acpi_evalf(vid_handle, NULL, "_DOS", "vd",
+		   ibm->state.video.autoswitch);
+}
+
+static int light_init(struct ibm_struct *ibm)
+{
+	/* kblt not supported on G40, R32, X20 */
+	ibm->supported = acpi_evalf(ec_handle, NULL, "KBLT", "qv");
+
+	return 0;
+}
+
+static int light_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+	int status = 0;
+
+	if (ibm->supported) {
+		if (!acpi_evalf(ec_handle, &status, "KBLT", "d"))
+			return -EIO;
+		len += sprintf(p + len, "status:\t\t%s\n", onoff(status, 0));
+	} else
+		len += sprintf(p + len, "status:\t\tunknown\n");
+
+	len += sprintf(p + len, "commands:\ton, off\n");
+
+	return len;
+}
+
+static int light_write(struct ibm_struct *ibm, char *buf)
+{
+	int cmos_cmd, lght_cmd;
+	char *cmd;
+	int success;
+	
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "on") == 0) {
+			cmos_cmd = 0x0c;
+			lght_cmd = 1;
+		} else if (strlencmp(cmd, "off") == 0) {
+			cmos_cmd = 0x0d;
+			lght_cmd = 0;
+		} else
+			return -EINVAL;
+		
+		success = cmos_handle ?
+			acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd) :
+			acpi_evalf(lght_handle, NULL, NULL, "vd", lght_cmd);
+		if (!success)
+			return -EIO;
+	}
+
+	return 0;
+}
+
+static int _sta(acpi_handle handle)
+{
+	int status;
+
+	if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
+		status = 0;
+
+	return status;
+}
+
+#define dock_docked() (_sta(dock_handle) & 1)
+
+static int dock_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+	int docked = dock_docked();
+
+	if (!dock_handle)
+		len += sprintf(p + len, "status:\t\tnot supported\n");
+	else if (!docked)
+		len += sprintf(p + len, "status:\t\tundocked\n");
+	else {
+		len += sprintf(p + len, "status:\t\tdocked\n");
+		len += sprintf(p + len, "commands:\tdock, undock\n");
+	}
+
+	return len;
+}
+
+static int dock_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+
+	if (!dock_docked())
+		return -EINVAL;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "undock") == 0) {
+			if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0))
+				return -EIO;
+			if (!acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
+				return -EIO;
+		} else if (strlencmp(cmd, "dock") == 0) {
+			if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
+				return -EIO;
+		} else
+			return -EINVAL;
+	}
+
+	return 0;
+}	
+
+static void dock_notify(struct ibm_struct *ibm, u32 event)
+{
+	int docked = dock_docked();
+
+	if (event == 3 && docked)
+		acpi_bus_generate_event(ibm->device, event, 1); /* button */
+	else if (event == 3 && !docked)
+		acpi_bus_generate_event(ibm->device, event, 2); /* undock */
+	else if (event == 0 && docked)
+		acpi_bus_generate_event(ibm->device, event, 3); /* dock */
+	else {
+		printk(IBM_ERR "unknown dock event %d, status %d\n",
+		       event, _sta(dock_handle));
+		acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
+	}
+}
+
+#define bay_occupied() (_sta(bay_handle) & 1)
+
+static int bay_init(struct ibm_struct *ibm)
+{
+	/* bay not supported on A21e, A22p, A31, A31p, G40, R32, R40e */
+	ibm->supported = bay_handle && bayej_handle &&
+		acpi_evalf(bay_handle, NULL, "_STA", "qv");
+
+	return 0;
+}
+
+static int bay_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+	int occupied = bay_occupied();
+	
+	if (!ibm->supported)
+		len += sprintf(p + len, "status:\t\tnot supported\n");
+	else if (!occupied)
+		len += sprintf(p + len, "status:\t\tunoccupied\n");
+	else {
+		len += sprintf(p + len, "status:\t\toccupied\n");
+		len += sprintf(p + len, "commands:\teject\n");
+	}
+
+	return len;
+}
+
+static int bay_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (strlencmp(cmd, "eject") == 0) {
+			if (!ibm->supported ||
+			    !acpi_evalf(bay_handle, NULL, "_EJ0", "vd", 1))
+				return -EIO;
+		} else
+			return -EINVAL;
+	}
+
+	return 0;
+}	
+
+static void bay_notify(struct ibm_struct *ibm, u32 event)
+{
+	acpi_bus_generate_event(ibm->device, event, 0);
+}
+
+static int cmos_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+
+	/* cmos not supported on A21e, A22p, T20, T21, X20 */
+	if (!cmos_handle)
+		len += sprintf(p + len, "status:\t\tnot supported\n");
+	else {
+		len += sprintf(p + len, "status:\t\tsupported\n");
+		len += sprintf(p + len, "commands:\t<int>\n");
+	}
+
+	return len;
+}
+
+static int cmos_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+	int cmos_cmd;
+
+	if (!cmos_handle)
+		return -EINVAL;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (sscanf(cmd, "%u", &cmos_cmd) == 1) {
+			/* cmos_cmd set */
+		} else
+			return -EINVAL;
+
+		if (!acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd))
+			return -EIO;
+	}
+
+	return 0;
+}	
+		
+static int led_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+
+	len += sprintf(p + len, "commands:\t"
+		       "<int> on, <int> off, <int> blink\n");
+
+	return len;
+}
+
+static int led_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+	unsigned int led;
+	int led_cmd, sysl_cmd, bled_a, bled_b;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (sscanf(cmd, "%u", &led) != 1)
+			return -EINVAL;
+
+		if (strstr(cmd, "blink")) {
+			led_cmd = 0xc0;
+			sysl_cmd = 2;
+			bled_a = 2;
+			bled_b = 1;
+		} else if (strstr(cmd, "on")) {
+			led_cmd = 0x80;
+			sysl_cmd = 1;
+			bled_a = 2;
+			bled_b = 0;
+		} else if (strstr(cmd, "off")) {
+			led_cmd = sysl_cmd = bled_a = bled_b = 0;
+		} else
+			return -EINVAL;
+		
+		if (led_handle) {
+			if (!acpi_evalf(led_handle, NULL, NULL, "vdd",
+					led, led_cmd))
+				return -EIO;
+		} else if (led < 2) {
+			if (acpi_evalf(sysl_handle, NULL, NULL, "vdd",
+				       led, sysl_cmd))
+				return -EIO;
+		} else if (led == 2 && bled_handle) {
+			if (acpi_evalf(bled_handle, NULL, NULL, "vdd",
+				       bled_a, bled_b))
+				return -EIO;
+		} else
+			return -EINVAL;
+	}
+
+	return 0;
+}	
+		
+static int beep_read(struct ibm_struct *ibm, char *p)
+{
+	int len = 0;
+
+	len += sprintf(p + len, "commands:\t<int>\n");
+
+	return len;
+}
+
+static int beep_write(struct ibm_struct *ibm, char *buf)
+{
+	char *cmd;
+	int beep_cmd;
+
+	while ((cmd = next_cmd(&buf))) {
+		if (sscanf(cmd, "%u", &beep_cmd) == 1) {
+			/* beep_cmd set */
+		} else
+			return -EINVAL;
+
+		if (!acpi_evalf(beep_handle, NULL, NULL, "vd", beep_cmd))
+			return -EIO;
+	}
+
+	return 0;
+}	
+		
+static struct ibm_struct ibms[] = {
+	{
+		.name	= "driver",
+		.init	= driver_init,
+		.read	= driver_read,
+	},
+	{
+		.name	= "hotkey",
+		.hid	= "IBM0068",
+		.init	= hotkey_init,
+		.read	= hotkey_read,
+		.write	= hotkey_write,
+		.exit	= hotkey_exit,
+		.notify	= hotkey_notify,
+		.handle	= &hkey_handle,
+		.type	= ACPI_DEVICE_NOTIFY,
+	},
+	{
+		.name	= "bluetooth",
+		.init	= bluetooth_init,
+		.read	= bluetooth_read,
+		.write	= bluetooth_write,
+	},
+	{
+		.name	= "video",
+		.init	= video_init,
+		.read	= video_read,
+		.write	= video_write,
+		.exit	= video_exit,
+	},
+	{
+		.name	= "light",
+		.init	= light_init,
+		.read	= light_read,
+		.write	= light_write,
+	},
+	{
+		.name	= "dock",
+		.read	= dock_read,
+		.write	= dock_write,
+		.notify	= dock_notify,
+		.handle	= &dock_handle,
+		.type	= ACPI_SYSTEM_NOTIFY,
+	},
+	{
+		.name	= "bay",
+		.init	= bay_init,
+		.read	= bay_read,
+		.write	= bay_write,
+		.notify	= bay_notify,
+		.handle	= &bay_handle,
+		.type	= ACPI_SYSTEM_NOTIFY,
+	},
+	{
+		.name	= "cmos",
+		.read	= cmos_read,
+		.write	= cmos_write,
+		.experimental = 1,
+	},
+	{
+		.name	= "led",
+		.read	= led_read,
+		.write	= led_write,
+		.experimental = 1,
+	},
+	{
+		.name	= "beep",
+		.read	= beep_read,
+		.write	= beep_write,
+		.experimental = 1,
+	},
+};
+#define NUM_IBMS (sizeof(ibms)/sizeof(ibms[0]))
+
+static int dispatch_read(char *page, char **start, off_t off, int count,
+			 int *eof, void *data)
+{
+	struct ibm_struct *ibm = (struct ibm_struct *)data;
+	int len;
+	
+	if (!ibm || !ibm->read)
+		return -EINVAL;
+
+	len = ibm->read(ibm, page);
+	if (len < 0)
+		return len;
+
+	if (len <= off + count)
+		*eof = 1;
+	*start = page + off;
+	len -= off;
+	if (len > count)
+		len = count;
+	if (len < 0)
+		len = 0;
+
+	return len;
+}
+
+static int dispatch_write(struct file *file, const char __user *userbuf,
+			  unsigned long count, void *data)
+{
+	struct ibm_struct *ibm = (struct ibm_struct *)data;
+	char *kernbuf;
+	int ret;
+
+	if (!ibm || !ibm->write)
+		return -EINVAL;
+
+	kernbuf = kmalloc(count + 2, GFP_KERNEL);
+	if (!kernbuf)
+		return -ENOMEM;
+
+        if (copy_from_user(kernbuf, userbuf, count)) {
+		kfree(kernbuf);
+                return -EFAULT;
+	}
+
+	kernbuf[count] = 0;
+	strcat(kernbuf, ",");
+	ret = ibm->write(ibm, kernbuf);
+	if (ret == 0)
+		ret = count;
+
+	kfree(kernbuf);
+
+        return ret;
+}
+
+static void dispatch_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct ibm_struct *ibm = (struct ibm_struct *)data;
+
+	if (!ibm || !ibm->notify)
+		return;
+
+	ibm->notify(ibm, event);
+}
+
+static int setup_notify(struct ibm_struct *ibm)
+{
+	acpi_status status;
+	int ret;
+
+	if (!*ibm->handle)
+		return 0;
+
+	ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
+	if (ret < 0) {
+		printk(IBM_ERR "%s device not present\n", ibm->name);
+		return 0;
+	}
+
+	acpi_driver_data(ibm->device) = ibm;
+	sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
+
+	status = acpi_install_notify_handler(*ibm->handle, ibm->type,
+					     dispatch_notify, ibm);
+	if (ACPI_FAILURE(status)) {
+		printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
+		       ibm->name, status);
+		return -ENODEV;
+	}
+
+	ibm->notify_installed = 1;
+
+	return 0;
+}
+
+static int device_add(struct acpi_device *device)
+{
+	return 0;
+}
+
+static int register_driver(struct ibm_struct *ibm)
+{
+	int ret;
+
+	ibm->driver = kmalloc(sizeof(struct acpi_driver), GFP_KERNEL);
+	if (!ibm->driver) {
+		printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
+		return -1;
+	}
+
+	memset(ibm->driver, 0, sizeof(struct acpi_driver));
+	sprintf(ibm->driver->name, "%s/%s", IBM_NAME, ibm->name);
+	ibm->driver->ids = ibm->hid;
+	ibm->driver->ops.add = &device_add;
+
+	ret = acpi_bus_register_driver(ibm->driver);
+	if (ret < 0) {
+		printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
+		       ibm->hid, ret);
+		kfree(ibm->driver);
+	}
+
+	return ret;
+}
+
+static int ibm_init(struct ibm_struct *ibm)
+{
+	int ret;
+	struct proc_dir_entry *entry;
+
+	if (ibm->experimental && !experimental)
+		return 0;
+
+	if (ibm->hid) {
+		ret = register_driver(ibm);
+		if (ret < 0)
+			return ret;
+		ibm->driver_registered = 1;
+	}
+
+	if (ibm->init) {
+		ret = ibm->init(ibm);
+		if (ret != 0)
+			return ret;
+		ibm->init_called = 1;
+	}
+
+	entry = create_proc_entry(ibm->name, S_IFREG | S_IRUGO | S_IWUSR,
+				  proc_dir);
+	if (!entry) {
+		printk(IBM_ERR "unable to create proc entry %s\n", ibm->name);
+		return -ENODEV;
+	}
+	entry->owner = THIS_MODULE;
+	ibm->proc_created = 1;
+	
+	entry->data = ibm;
+	if (ibm->read)
+		entry->read_proc = &dispatch_read;
+	if (ibm->write)
+		entry->write_proc = &dispatch_write;
+
+	if (ibm->notify) {
+		ret = setup_notify(ibm);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void ibm_exit(struct ibm_struct *ibm)
+{
+	if (ibm->notify_installed)
+		acpi_remove_notify_handler(*ibm->handle, ibm->type,
+					   dispatch_notify);
+
+	if (ibm->proc_created)
+		remove_proc_entry(ibm->name, proc_dir);
+
+	if (ibm->init_called && ibm->exit)
+		ibm->exit(ibm);
+
+	if (ibm->driver_registered) {
+		acpi_bus_unregister_driver(ibm->driver);
+		kfree(ibm->driver);
+	}
+}
+
+static int ibm_handle_init(char *name,
+			   acpi_handle *handle, acpi_handle parent,
+			   char **paths, int num_paths, int required)
+{
+	int i;
+	acpi_status status;
+
+	for (i=0; i<num_paths; i++) {
+		status = acpi_get_handle(parent, paths[i], handle);
+		if (ACPI_SUCCESS(status))
+			return 0;
+	}
+	
+	*handle = NULL;
+
+	if (required) {
+		printk(IBM_ERR "%s object not found\n", name);
+		return -1;
+	}
+
+	return 0;
+}
+
+#define IBM_HANDLE_INIT(object, required)				\
+	ibm_handle_init(#object, &object##_handle, *object##_parent,	\
+		object##_paths, sizeof(object##_paths)/sizeof(char*), required)
+
+
+static int set_ibm_param(const char *val, struct kernel_param *kp)
+{
+	unsigned int i;
+	char arg_with_comma[32];
+
+	if (strlen(val) > 30)
+		return -ENOSPC;
+
+	strcpy(arg_with_comma, val);
+	strcat(arg_with_comma, ",");
+
+	for (i=0; i<NUM_IBMS; i++)
+		if (strcmp(ibms[i].name, kp->name) == 0)
+			return ibms[i].write(&ibms[i], arg_with_comma);
+	BUG();
+	return -EINVAL;
+}
+
+#define IBM_PARAM(feature) \
+	module_param_call(feature, set_ibm_param, NULL, NULL, 0)
+
+static void acpi_ibm_exit(void)
+{
+	int i;
+
+	for (i=NUM_IBMS-1; i>=0; i--)
+		ibm_exit(&ibms[i]);
+
+	remove_proc_entry(IBM_DIR, acpi_root_dir);
+}
+
+static int __init acpi_ibm_init(void)
+{
+	int ret, i;
+
+	if (acpi_disabled)
+		return -ENODEV;
+
+	/* these handles are required */
+	if (IBM_HANDLE_INIT(ec,	  1) < 0 ||
+	    IBM_HANDLE_INIT(hkey, 1) < 0 ||
+	    IBM_HANDLE_INIT(vid,  1) < 0 ||
+	    IBM_HANDLE_INIT(beep, 1) < 0)
+		return -ENODEV;
+
+	/* these handles have alternatives */
+	IBM_HANDLE_INIT(lght, 0);
+	if (IBM_HANDLE_INIT(cmos, !lght_handle) < 0)
+		return -ENODEV;
+	IBM_HANDLE_INIT(sysl, 0);
+	if (IBM_HANDLE_INIT(led, !sysl_handle) < 0)
+		return -ENODEV;
+
+	/* these handles are not required */
+	IBM_HANDLE_INIT(dock,  0);
+	IBM_HANDLE_INIT(bay,   0);
+	IBM_HANDLE_INIT(bayej, 0);
+	IBM_HANDLE_INIT(bled,  0);
+
+	proc_dir = proc_mkdir(IBM_DIR, acpi_root_dir);
+	if (!proc_dir) {
+		printk(IBM_ERR "unable to create proc dir %s", IBM_DIR);
+		return -ENODEV;
+	}
+	proc_dir->owner = THIS_MODULE;
+	
+	for (i=0; i<NUM_IBMS; i++) {
+		ret = ibm_init(&ibms[i]);
+		if (ret < 0) {
+			acpi_ibm_exit();
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+module_init(acpi_ibm_init);
+module_exit(acpi_ibm_exit);
+
+MODULE_AUTHOR("Borislav Deianov");
+MODULE_DESCRIPTION(IBM_DESC);
+MODULE_LICENSE("GPL");
+
+IBM_PARAM(hotkey);
+IBM_PARAM(bluetooth);
+IBM_PARAM(video);
+IBM_PARAM(light);
+IBM_PARAM(dock);
+IBM_PARAM(bay);
+IBM_PARAM(cmos);
+IBM_PARAM(led);
+IBM_PARAM(beep);