2 * Samsung Laptop driver
4 * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de)
5 * Copyright (C) 2009,2011 Novell Inc.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/backlight.h>
20 #include <linux/leds.h>
22 #include <linux/dmi.h>
23 #include <linux/platform_device.h>
24 #include <linux/rfkill.h>
25 #include <linux/acpi.h>
26 #include <linux/seq_file.h>
27 #include <linux/debugfs.h>
28 #include <linux/ctype.h>
31 * This driver is needed because a number of Samsung laptops do not hook
32 * their control settings through ACPI. So we have to poke around in the
33 * BIOS to do things like brightness values, and "special" key controls.
37 * We have 0 - 8 as valid brightness levels. The specs say that level 0 should
38 * be reserved by the BIOS (which really doesn't make much sense), we tell
39 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
41 #define MAX_BRIGHT 0x07
44 #define SABI_IFACE_MAIN 0x00
45 #define SABI_IFACE_SUB 0x02
46 #define SABI_IFACE_COMPLETE 0x04
47 #define SABI_IFACE_DATA 0x05
49 #define WL_STATUS_WLAN 0x0
50 #define WL_STATUS_BT 0x2
52 /* Structure get/set data using sabi */
65 struct sabi_header_offsets {
74 struct sabi_commands {
76 * Brightness is 0 - 8, as described above.
77 * Value 0 is for the BIOS to use
84 * 0x00 - wireless is off
85 * 0x01 - wireless is on
89 * TODO, verify 3G is correct, that doesn't seem right...
91 u16 get_wireless_button;
92 u16 set_wireless_button;
94 /* 0 is off, 1 is on */
99 * 0x80 or 0x00 - no action
100 * 0x81 - recovery key pressed
102 u16 get_recovery_mode;
103 u16 set_recovery_mode;
106 * on seclinux: 0 is low, 1 is high,
107 * on swsmi: 0 is normal, 1 is silent, 2 is turbo
109 u16 get_performance_level;
110 u16 set_performance_level;
112 /* 0x80 is off, 0x81 is on */
113 u16 get_battery_life_extender;
114 u16 set_battery_life_extender;
116 /* 0x80 is off, 0x81 is on */
120 /* the first byte is for bluetooth and the third one is for wlan */
121 u16 get_wireless_status;
122 u16 set_wireless_status;
124 /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
128 * Tell the BIOS that Linux is running on this machine.
129 * 81 is on, 80 is off
134 struct sabi_performance_level {
141 const char *test_string;
143 const struct sabi_header_offsets header_offsets;
144 const struct sabi_commands commands;
145 const struct sabi_performance_level performance_levels[4];
150 static const struct sabi_config sabi_configs[] = {
152 /* I don't know if it is really 2, but it it is
153 * less than 3 anyway */
156 .test_string = "SECLINUX",
158 .main_function = 0x4c49,
166 .data_segment = 0x07,
170 .get_brightness = 0x00,
171 .set_brightness = 0x01,
173 .get_wireless_button = 0x02,
174 .set_wireless_button = 0x03,
176 .get_backlight = 0x04,
177 .set_backlight = 0x05,
179 .get_recovery_mode = 0x06,
180 .set_recovery_mode = 0x07,
182 .get_performance_level = 0x08,
183 .set_performance_level = 0x09,
185 .get_battery_life_extender = 0xFFFF,
186 .set_battery_life_extender = 0xFFFF,
188 .get_usb_charge = 0xFFFF,
189 .set_usb_charge = 0xFFFF,
191 .get_wireless_status = 0xFFFF,
192 .set_wireless_status = 0xFFFF,
194 .kbd_backlight = 0xFFFF,
199 .performance_levels = {
216 .test_string = "SwSmi@",
218 .main_function = 0x5843,
226 .data_segment = 0x07,
230 .get_brightness = 0x10,
231 .set_brightness = 0x11,
233 .get_wireless_button = 0x12,
234 .set_wireless_button = 0x13,
236 .get_backlight = 0x2d,
237 .set_backlight = 0x2e,
239 .get_recovery_mode = 0xff,
240 .set_recovery_mode = 0xff,
242 .get_performance_level = 0x31,
243 .set_performance_level = 0x32,
245 .get_battery_life_extender = 0x65,
246 .set_battery_life_extender = 0x66,
248 .get_usb_charge = 0x67,
249 .set_usb_charge = 0x68,
251 .get_wireless_status = 0x69,
252 .set_wireless_status = 0x6a,
254 .kbd_backlight = 0x78,
259 .performance_levels = {
281 * samsung-laptop/ - debugfs root directory
282 * f0000_segment - dump f0000 segment
283 * command - current command
284 * data - current data
285 * d0, d1, d2, d3 - data fields
286 * call - call SABI using command and data
288 * This allow to call arbitrary sabi commands wihout
289 * modifying the driver at all.
290 * For example, setting the keyboard backlight brightness to 5
292 * echo 0x78 > command
300 struct samsung_laptop_debug {
302 struct sabi_data data;
305 struct debugfs_blob_wrapper f0000_wrapper;
306 struct debugfs_blob_wrapper data_wrapper;
307 struct debugfs_blob_wrapper sdiag_wrapper;
310 struct samsung_laptop;
312 struct samsung_rfkill {
313 struct samsung_laptop *samsung;
314 struct rfkill *rfkill;
315 enum rfkill_type type;
318 struct samsung_laptop {
319 const struct sabi_config *config;
322 void __iomem *sabi_iface;
323 void __iomem *f0000_segment;
325 struct mutex sabi_mutex;
327 struct platform_device *platform_device;
328 struct backlight_device *backlight_device;
330 struct samsung_rfkill wlan;
331 struct samsung_rfkill bluetooth;
333 struct led_classdev kbd_led;
335 struct workqueue_struct *led_workqueue;
336 struct work_struct kbd_led_work;
338 struct samsung_laptop_debug debug;
340 bool handle_backlight;
341 bool has_stepping_quirk;
349 module_param(force, bool, 0);
350 MODULE_PARM_DESC(force,
351 "Disable the DMI check and forces the driver to be loaded");
354 module_param(debug, bool, S_IRUGO | S_IWUSR);
355 MODULE_PARM_DESC(debug, "Debug enabled or not");
357 static int sabi_command(struct samsung_laptop *samsung, u16 command,
358 struct sabi_data *in,
359 struct sabi_data *out)
361 const struct sabi_config *config = samsung->config;
363 u16 port = readw(samsung->sabi + config->header_offsets.port);
364 u8 complete, iface_data;
366 mutex_lock(&samsung->sabi_mutex);
370 pr_info("SABI command:0x%04x "
371 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
372 command, in->d0, in->d1, in->d2, in->d3);
374 pr_info("SABI command:0x%04x", command);
377 /* enable memory to be able to write to it */
378 outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
380 /* write out the command */
381 writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
382 writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
383 writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
385 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
386 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
387 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
388 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
390 outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
392 /* write protect memory to make it safe */
393 outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
395 /* see if the command actually succeeded */
396 complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
397 iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
399 /* iface_data = 0xFF happens when a command is not known
400 * so we only add a warning in debug mode since we will
401 * probably issue some unknown command at startup to find
402 * out which features are supported */
403 if (complete != 0xaa || (iface_data == 0xff && debug))
404 pr_warn("SABI command 0x%04x failed with"
405 " completion flag 0x%02x and interface data 0x%02x",
406 command, complete, iface_data);
408 if (complete != 0xaa || iface_data == 0xff) {
414 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
415 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
416 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
417 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
421 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
422 out->d0, out->d1, out->d2, out->d3);
426 mutex_unlock(&samsung->sabi_mutex);
430 /* simple wrappers usable with most commands */
431 static int sabi_set_commandb(struct samsung_laptop *samsung,
432 u16 command, u8 data)
434 struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
437 return sabi_command(samsung, command, &in, NULL);
440 static int read_brightness(struct samsung_laptop *samsung)
442 const struct sabi_config *config = samsung->config;
443 const struct sabi_commands *commands = &samsung->config->commands;
444 struct sabi_data sretval;
445 int user_brightness = 0;
448 retval = sabi_command(samsung, commands->get_brightness,
453 user_brightness = sretval.data[0];
454 if (user_brightness > config->min_brightness)
455 user_brightness -= config->min_brightness;
459 return user_brightness;
462 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
464 const struct sabi_config *config = samsung->config;
465 const struct sabi_commands *commands = &samsung->config->commands;
466 u8 user_level = user_brightness + config->min_brightness;
468 if (samsung->has_stepping_quirk && user_level != 0) {
470 * short circuit if the specified level is what's already set
471 * to prevent the screen from flickering needlessly
473 if (user_brightness == read_brightness(samsung))
476 sabi_set_commandb(samsung, commands->set_brightness, 0);
479 sabi_set_commandb(samsung, commands->set_brightness, user_level);
482 static int get_brightness(struct backlight_device *bd)
484 struct samsung_laptop *samsung = bl_get_data(bd);
486 return read_brightness(samsung);
489 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
493 int orig_level = read_brightness(samsung);
496 * Some laptops exhibit the strange behaviour of stepping toward
497 * (rather than setting) the brightness except when changing to/from
498 * brightness level 0. This behaviour is checked for here and worked
499 * around in set_brightness.
503 set_brightness(samsung, 1);
505 initial_level = read_brightness(samsung);
507 if (initial_level <= 2)
508 check_level = initial_level + 2;
510 check_level = initial_level - 2;
512 samsung->has_stepping_quirk = false;
513 set_brightness(samsung, check_level);
515 if (read_brightness(samsung) != check_level) {
516 samsung->has_stepping_quirk = true;
517 pr_info("enabled workaround for brightness stepping quirk\n");
520 set_brightness(samsung, orig_level);
523 static int update_status(struct backlight_device *bd)
525 struct samsung_laptop *samsung = bl_get_data(bd);
526 const struct sabi_commands *commands = &samsung->config->commands;
528 set_brightness(samsung, bd->props.brightness);
530 if (bd->props.power == FB_BLANK_UNBLANK)
531 sabi_set_commandb(samsung, commands->set_backlight, 1);
533 sabi_set_commandb(samsung, commands->set_backlight, 0);
538 static const struct backlight_ops backlight_ops = {
539 .get_brightness = get_brightness,
540 .update_status = update_status,
543 static int seclinux_rfkill_set(void *data, bool blocked)
545 struct samsung_rfkill *srfkill = data;
546 struct samsung_laptop *samsung = srfkill->samsung;
547 const struct sabi_commands *commands = &samsung->config->commands;
549 return sabi_set_commandb(samsung, commands->set_wireless_button,
553 static struct rfkill_ops seclinux_rfkill_ops = {
554 .set_block = seclinux_rfkill_set,
557 static int swsmi_wireless_status(struct samsung_laptop *samsung,
558 struct sabi_data *data)
560 const struct sabi_commands *commands = &samsung->config->commands;
562 return sabi_command(samsung, commands->get_wireless_status,
566 static int swsmi_rfkill_set(void *priv, bool blocked)
568 struct samsung_rfkill *srfkill = priv;
569 struct samsung_laptop *samsung = srfkill->samsung;
570 const struct sabi_commands *commands = &samsung->config->commands;
571 struct sabi_data data;
574 ret = swsmi_wireless_status(samsung, &data);
578 /* Don't set the state for non-present devices */
579 for (i = 0; i < 4; i++)
580 if (data.data[i] == 0x02)
583 if (srfkill->type == RFKILL_TYPE_WLAN)
584 data.data[WL_STATUS_WLAN] = !blocked;
585 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
586 data.data[WL_STATUS_BT] = !blocked;
588 return sabi_command(samsung, commands->set_wireless_status,
592 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
594 struct samsung_rfkill *srfkill = priv;
595 struct samsung_laptop *samsung = srfkill->samsung;
596 struct sabi_data data;
599 ret = swsmi_wireless_status(samsung, &data);
603 if (srfkill->type == RFKILL_TYPE_WLAN)
604 ret = data.data[WL_STATUS_WLAN];
605 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
606 ret = data.data[WL_STATUS_BT];
610 rfkill_set_sw_state(rfkill, !ret);
613 static struct rfkill_ops swsmi_rfkill_ops = {
614 .set_block = swsmi_rfkill_set,
615 .query = swsmi_rfkill_query,
618 static ssize_t get_performance_level(struct device *dev,
619 struct device_attribute *attr, char *buf)
621 struct samsung_laptop *samsung = dev_get_drvdata(dev);
622 const struct sabi_config *config = samsung->config;
623 const struct sabi_commands *commands = &config->commands;
624 struct sabi_data sretval;
629 retval = sabi_command(samsung, commands->get_performance_level,
634 /* The logic is backwards, yeah, lots of fun... */
635 for (i = 0; config->performance_levels[i].name; ++i) {
636 if (sretval.data[0] == config->performance_levels[i].value)
637 return sprintf(buf, "%s\n", config->performance_levels[i].name);
639 return sprintf(buf, "%s\n", "unknown");
642 static ssize_t set_performance_level(struct device *dev,
643 struct device_attribute *attr, const char *buf,
646 struct samsung_laptop *samsung = dev_get_drvdata(dev);
647 const struct sabi_config *config = samsung->config;
648 const struct sabi_commands *commands = &config->commands;
654 for (i = 0; config->performance_levels[i].name; ++i) {
655 const struct sabi_performance_level *level =
656 &config->performance_levels[i];
657 if (!strncasecmp(level->name, buf, strlen(level->name))) {
658 sabi_set_commandb(samsung,
659 commands->set_performance_level,
665 if (!config->performance_levels[i].name)
671 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
672 get_performance_level, set_performance_level);
674 static int read_battery_life_extender(struct samsung_laptop *samsung)
676 const struct sabi_commands *commands = &samsung->config->commands;
677 struct sabi_data data;
680 if (commands->get_battery_life_extender == 0xFFFF)
683 memset(&data, 0, sizeof(data));
685 retval = sabi_command(samsung, commands->get_battery_life_extender,
691 if (data.data[0] != 0 && data.data[0] != 1)
697 static int write_battery_life_extender(struct samsung_laptop *samsung,
700 const struct sabi_commands *commands = &samsung->config->commands;
701 struct sabi_data data;
703 memset(&data, 0, sizeof(data));
704 data.data[0] = 0x80 | enabled;
705 return sabi_command(samsung, commands->set_battery_life_extender,
709 static ssize_t get_battery_life_extender(struct device *dev,
710 struct device_attribute *attr,
713 struct samsung_laptop *samsung = dev_get_drvdata(dev);
716 ret = read_battery_life_extender(samsung);
720 return sprintf(buf, "%d\n", ret);
723 static ssize_t set_battery_life_extender(struct device *dev,
724 struct device_attribute *attr,
725 const char *buf, size_t count)
727 struct samsung_laptop *samsung = dev_get_drvdata(dev);
730 if (!count || sscanf(buf, "%i", &value) != 1)
733 ret = write_battery_life_extender(samsung, !!value);
740 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
741 get_battery_life_extender, set_battery_life_extender);
743 static int read_usb_charge(struct samsung_laptop *samsung)
745 const struct sabi_commands *commands = &samsung->config->commands;
746 struct sabi_data data;
749 if (commands->get_usb_charge == 0xFFFF)
752 memset(&data, 0, sizeof(data));
754 retval = sabi_command(samsung, commands->get_usb_charge,
760 if (data.data[0] != 0 && data.data[0] != 1)
766 static int write_usb_charge(struct samsung_laptop *samsung,
769 const struct sabi_commands *commands = &samsung->config->commands;
770 struct sabi_data data;
772 memset(&data, 0, sizeof(data));
773 data.data[0] = 0x80 | enabled;
774 return sabi_command(samsung, commands->set_usb_charge,
778 static ssize_t get_usb_charge(struct device *dev,
779 struct device_attribute *attr,
782 struct samsung_laptop *samsung = dev_get_drvdata(dev);
785 ret = read_usb_charge(samsung);
789 return sprintf(buf, "%d\n", ret);
792 static ssize_t set_usb_charge(struct device *dev,
793 struct device_attribute *attr,
794 const char *buf, size_t count)
796 struct samsung_laptop *samsung = dev_get_drvdata(dev);
799 if (!count || sscanf(buf, "%i", &value) != 1)
802 ret = write_usb_charge(samsung, !!value);
809 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
810 get_usb_charge, set_usb_charge);
812 static struct attribute *platform_attributes[] = {
813 &dev_attr_performance_level.attr,
814 &dev_attr_battery_life_extender.attr,
815 &dev_attr_usb_charge.attr,
819 static int find_signature(void __iomem *memcheck, const char *testStr)
824 for (loca = 0; loca < 0xffff; loca++) {
825 char temp = readb(memcheck + loca);
827 if (temp == testStr[i]) {
828 if (i == strlen(testStr)-1)
838 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
840 if (samsung->wlan.rfkill) {
841 rfkill_unregister(samsung->wlan.rfkill);
842 rfkill_destroy(samsung->wlan.rfkill);
843 samsung->wlan.rfkill = NULL;
845 if (samsung->bluetooth.rfkill) {
846 rfkill_unregister(samsung->bluetooth.rfkill);
847 rfkill_destroy(samsung->bluetooth.rfkill);
848 samsung->bluetooth.rfkill = NULL;
852 static int samsung_new_rfkill(struct samsung_laptop *samsung,
853 struct samsung_rfkill *arfkill,
854 const char *name, enum rfkill_type type,
855 const struct rfkill_ops *ops,
858 struct rfkill **rfkill = &arfkill->rfkill;
861 arfkill->type = type;
862 arfkill->samsung = samsung;
864 *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
871 rfkill_init_sw_state(*rfkill, blocked);
873 ret = rfkill_register(*rfkill);
875 rfkill_destroy(*rfkill);
882 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
884 return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
885 RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
888 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
890 struct sabi_data data;
893 ret = swsmi_wireless_status(samsung, &data);
895 /* Some swsmi laptops use the old seclinux way to control
896 * wireless devices */
898 ret = samsung_rfkill_init_seclinux(samsung);
902 /* 0x02 seems to mean that the device is no present/available */
904 if (data.data[WL_STATUS_WLAN] != 0x02)
905 ret = samsung_new_rfkill(samsung, &samsung->wlan,
909 !data.data[WL_STATUS_WLAN]);
913 if (data.data[WL_STATUS_BT] != 0x02)
914 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
916 RFKILL_TYPE_BLUETOOTH,
918 !data.data[WL_STATUS_BT]);
924 samsung_rfkill_exit(samsung);
929 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
931 if (samsung->config->sabi_version == 2)
932 return samsung_rfkill_init_seclinux(samsung);
933 if (samsung->config->sabi_version == 3)
934 return samsung_rfkill_init_swsmi(samsung);
938 static int kbd_backlight_enable(struct samsung_laptop *samsung)
940 const struct sabi_commands *commands = &samsung->config->commands;
941 struct sabi_data data;
944 if (commands->kbd_backlight == 0xFFFF)
947 memset(&data, 0, sizeof(data));
949 retval = sabi_command(samsung, commands->kbd_backlight,
955 if (data.d0 != 0xccdd)
960 static int kbd_backlight_read(struct samsung_laptop *samsung)
962 const struct sabi_commands *commands = &samsung->config->commands;
963 struct sabi_data data;
966 memset(&data, 0, sizeof(data));
968 retval = sabi_command(samsung, commands->kbd_backlight,
977 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
979 const struct sabi_commands *commands = &samsung->config->commands;
980 struct sabi_data data;
982 memset(&data, 0, sizeof(data));
983 data.d0 = 0x82 | ((brightness & 0xFF) << 8);
984 return sabi_command(samsung, commands->kbd_backlight,
988 static void kbd_led_update(struct work_struct *work)
990 struct samsung_laptop *samsung;
992 samsung = container_of(work, struct samsung_laptop, kbd_led_work);
993 kbd_backlight_write(samsung, samsung->kbd_led_wk);
996 static void kbd_led_set(struct led_classdev *led_cdev,
997 enum led_brightness value)
999 struct samsung_laptop *samsung;
1001 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1003 if (value > samsung->kbd_led.max_brightness)
1004 value = samsung->kbd_led.max_brightness;
1008 samsung->kbd_led_wk = value;
1009 queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1012 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1014 struct samsung_laptop *samsung;
1016 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1017 return kbd_backlight_read(samsung);
1020 static void samsung_leds_exit(struct samsung_laptop *samsung)
1022 if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1023 led_classdev_unregister(&samsung->kbd_led);
1024 if (samsung->led_workqueue)
1025 destroy_workqueue(samsung->led_workqueue);
1028 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1032 samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1033 if (!samsung->led_workqueue)
1036 if (kbd_backlight_enable(samsung) >= 0) {
1037 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1039 samsung->kbd_led.name = "samsung::kbd_backlight";
1040 samsung->kbd_led.brightness_set = kbd_led_set;
1041 samsung->kbd_led.brightness_get = kbd_led_get;
1042 samsung->kbd_led.max_brightness = 8;
1044 ret = led_classdev_register(&samsung->platform_device->dev,
1049 samsung_leds_exit(samsung);
1054 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1056 if (samsung->backlight_device) {
1057 backlight_device_unregister(samsung->backlight_device);
1058 samsung->backlight_device = NULL;
1062 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1064 struct backlight_device *bd;
1065 struct backlight_properties props;
1067 if (!samsung->handle_backlight)
1070 memset(&props, 0, sizeof(struct backlight_properties));
1071 props.type = BACKLIGHT_PLATFORM;
1072 props.max_brightness = samsung->config->max_brightness -
1073 samsung->config->min_brightness;
1075 bd = backlight_device_register("samsung",
1076 &samsung->platform_device->dev,
1077 samsung, &backlight_ops,
1082 samsung->backlight_device = bd;
1083 samsung->backlight_device->props.brightness = read_brightness(samsung);
1084 samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1085 backlight_update_status(samsung->backlight_device);
1090 static mode_t samsung_sysfs_is_visible(struct kobject *kobj,
1091 struct attribute *attr, int idx)
1093 struct device *dev = container_of(kobj, struct device, kobj);
1094 struct platform_device *pdev = to_platform_device(dev);
1095 struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1098 if (attr == &dev_attr_performance_level.attr)
1099 ok = !!samsung->config->performance_levels[0].name;
1100 if (attr == &dev_attr_battery_life_extender.attr)
1101 ok = !!(read_battery_life_extender(samsung) >= 0);
1102 if (attr == &dev_attr_usb_charge.attr)
1103 ok = !!(read_usb_charge(samsung) >= 0);
1105 return ok ? attr->mode : 0;
1108 static struct attribute_group platform_attribute_group = {
1109 .is_visible = samsung_sysfs_is_visible,
1110 .attrs = platform_attributes
1113 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1115 struct platform_device *device = samsung->platform_device;
1117 sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1120 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1122 struct platform_device *device = samsung->platform_device;
1124 return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1128 static int show_call(struct seq_file *m, void *data)
1130 struct samsung_laptop *samsung = m->private;
1131 struct sabi_data *sdata = &samsung->debug.data;
1134 seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1135 samsung->debug.command,
1136 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1138 ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1141 seq_printf(m, "SABI command 0x%04x failed\n",
1142 samsung->debug.command);
1146 seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1147 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1151 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1153 return single_open(file, show_call, inode->i_private);
1156 static const struct file_operations samsung_laptop_call_io_ops = {
1157 .owner = THIS_MODULE,
1158 .open = samsung_debugfs_open,
1160 .llseek = seq_lseek,
1161 .release = single_release,
1164 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1166 debugfs_remove_recursive(samsung->debug.root);
1169 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1171 struct dentry *dent;
1173 samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1174 if (!samsung->debug.root) {
1175 pr_err("failed to create debugfs directory");
1179 samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1180 samsung->debug.f0000_wrapper.size = 0xffff;
1182 samsung->debug.data_wrapper.data = &samsung->debug.data;
1183 samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1185 samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1186 samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1188 dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1189 samsung->debug.root, &samsung->debug.command);
1193 dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1194 &samsung->debug.data.d0);
1198 dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1199 &samsung->debug.data.d1);
1203 dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1204 &samsung->debug.data.d2);
1208 dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1209 &samsung->debug.data.d3);
1213 dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1214 samsung->debug.root,
1215 &samsung->debug.data_wrapper);
1219 dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1220 samsung->debug.root,
1221 &samsung->debug.f0000_wrapper);
1225 dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1226 samsung->debug.root, samsung,
1227 &samsung_laptop_call_io_ops);
1231 dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1232 samsung->debug.root,
1233 &samsung->debug.sdiag_wrapper);
1240 samsung_debugfs_exit(samsung);
1244 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1246 const struct sabi_config *config = samsung->config;
1248 /* Turn off "Linux" mode in the BIOS */
1249 if (config && config->commands.set_linux != 0xff)
1250 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1252 if (samsung->sabi_iface) {
1253 iounmap(samsung->sabi_iface);
1254 samsung->sabi_iface = NULL;
1256 if (samsung->f0000_segment) {
1257 iounmap(samsung->f0000_segment);
1258 samsung->f0000_segment = NULL;
1261 samsung->config = NULL;
1264 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1265 unsigned int ifaceP)
1267 const struct sabi_config *config = samsung->config;
1269 printk(KERN_DEBUG "This computer supports SABI==%x\n",
1270 loca + 0xf0000 - 6);
1272 printk(KERN_DEBUG "SABI header:\n");
1273 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1274 readw(samsung->sabi + config->header_offsets.port));
1275 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1276 readb(samsung->sabi + config->header_offsets.iface_func));
1277 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1278 readb(samsung->sabi + config->header_offsets.en_mem));
1279 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1280 readb(samsung->sabi + config->header_offsets.re_mem));
1281 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1282 readw(samsung->sabi + config->header_offsets.data_offset));
1283 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1284 readw(samsung->sabi + config->header_offsets.data_segment));
1286 printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1289 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1291 int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1298 * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1300 * Product name: 90X3A
1301 * BIOS Version: 07HL
1304 for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1305 char temp = readb(samsung->f0000_segment + loca);
1307 if (isalnum(temp) || temp == '/' || temp == '-')
1308 samsung->sdiag[i++] = temp;
1313 if (debug && samsung->sdiag[0])
1314 pr_info("sdiag: %s", samsung->sdiag);
1317 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1319 const struct sabi_config *config = NULL;
1320 const struct sabi_commands *commands;
1321 unsigned int ifaceP;
1326 samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1327 if (!samsung->f0000_segment) {
1329 pr_err("Can't map the segment at 0xf0000\n");
1334 samsung_sabi_diag(samsung);
1336 /* Try to find one of the signatures in memory to find the header */
1337 for (i = 0; sabi_configs[i].test_string != 0; ++i) {
1338 samsung->config = &sabi_configs[i];
1339 loca = find_signature(samsung->f0000_segment,
1340 samsung->config->test_string);
1345 if (loca == 0xffff) {
1347 pr_err("This computer does not support SABI\n");
1352 config = samsung->config;
1353 commands = &config->commands;
1355 /* point to the SMI port Number */
1357 samsung->sabi = (samsung->f0000_segment + loca);
1359 /* Get a pointer to the SABI Interface */
1360 ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1361 ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1364 samsung_sabi_infos(samsung, loca, ifaceP);
1366 samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1367 if (!samsung->sabi_iface) {
1368 pr_err("Can't remap %x\n", ifaceP);
1373 /* Turn on "Linux" mode in the BIOS */
1374 if (commands->set_linux != 0xff) {
1375 int retval = sabi_set_commandb(samsung,
1376 commands->set_linux, 0x81);
1378 pr_warn("Linux mode was not set!\n");
1384 /* Check for stepping quirk */
1385 if (samsung->handle_backlight)
1386 check_for_stepping_quirk(samsung);
1388 pr_info("detected SABI interface: %s\n",
1389 samsung->config->test_string);
1393 samsung_sabi_exit(samsung);
1398 static void samsung_platform_exit(struct samsung_laptop *samsung)
1400 if (samsung->platform_device) {
1401 platform_device_unregister(samsung->platform_device);
1402 samsung->platform_device = NULL;
1406 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1408 struct platform_device *pdev;
1410 pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1412 return PTR_ERR(pdev);
1414 samsung->platform_device = pdev;
1415 platform_set_drvdata(samsung->platform_device, samsung);
1419 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1422 DMI_MATCH(DMI_SYS_VENDOR,
1423 "SAMSUNG ELECTRONICS CO., LTD."),
1424 DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1429 DMI_MATCH(DMI_SYS_VENDOR,
1430 "SAMSUNG ELECTRONICS CO., LTD."),
1431 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1436 DMI_MATCH(DMI_SYS_VENDOR,
1437 "SAMSUNG ELECTRONICS CO., LTD."),
1438 DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1443 DMI_MATCH(DMI_SYS_VENDOR,
1444 "SAMSUNG ELECTRONICS CO., LTD."),
1445 DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1450 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1452 static struct platform_device *samsung_platform_device;
1454 static int __init samsung_init(void)
1456 struct samsung_laptop *samsung;
1459 if (!force && !dmi_check_system(samsung_dmi_table))
1462 samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1466 mutex_init(&samsung->sabi_mutex);
1467 samsung->handle_backlight = true;
1470 /* Don't handle backlight here if the acpi video already handle it */
1471 if (acpi_video_backlight_support())
1472 samsung->handle_backlight = false;
1474 ret = samsung_platform_init(samsung);
1476 goto error_platform;
1478 ret = samsung_sabi_init(samsung);
1483 /* Only log that if we are really on a sabi platform */
1484 if (acpi_video_backlight_support())
1485 pr_info("Backlight controlled by ACPI video driver\n");
1488 ret = samsung_sysfs_init(samsung);
1492 ret = samsung_backlight_init(samsung);
1494 goto error_backlight;
1496 ret = samsung_rfkill_init(samsung);
1500 ret = samsung_leds_init(samsung);
1504 ret = samsung_debugfs_init(samsung);
1508 samsung_platform_device = samsung->platform_device;
1512 samsung_leds_exit(samsung);
1514 samsung_rfkill_exit(samsung);
1516 samsung_backlight_exit(samsung);
1518 samsung_sysfs_exit(samsung);
1520 samsung_sabi_exit(samsung);
1522 samsung_platform_exit(samsung);
1528 static void __exit samsung_exit(void)
1530 struct samsung_laptop *samsung;
1532 samsung = platform_get_drvdata(samsung_platform_device);
1534 samsung_debugfs_exit(samsung);
1535 samsung_leds_exit(samsung);
1536 samsung_rfkill_exit(samsung);
1537 samsung_backlight_exit(samsung);
1538 samsung_sysfs_exit(samsung);
1539 samsung_sabi_exit(samsung);
1540 samsung_platform_exit(samsung);
1543 samsung_platform_device = NULL;
1546 module_init(samsung_init);
1547 module_exit(samsung_exit);
1549 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1550 MODULE_DESCRIPTION("Samsung Backlight driver");
1551 MODULE_LICENSE("GPL");