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>
29 #include <linux/efi.h>
30 #include <linux/suspend.h>
31 #include <acpi/video.h>
34 * This driver is needed because a number of Samsung laptops do not hook
35 * their control settings through ACPI. So we have to poke around in the
36 * BIOS to do things like brightness values, and "special" key controls.
40 * We have 0 - 8 as valid brightness levels. The specs say that level 0 should
41 * be reserved by the BIOS (which really doesn't make much sense), we tell
42 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
44 #define MAX_BRIGHT 0x07
47 #define SABI_IFACE_MAIN 0x00
48 #define SABI_IFACE_SUB 0x02
49 #define SABI_IFACE_COMPLETE 0x04
50 #define SABI_IFACE_DATA 0x05
52 #define WL_STATUS_WLAN 0x0
53 #define WL_STATUS_BT 0x2
55 /* Structure get/set data using sabi */
68 struct sabi_header_offsets {
77 struct sabi_commands {
79 * Brightness is 0 - 8, as described above.
80 * Value 0 is for the BIOS to use
87 * 0x00 - wireless is off
88 * 0x01 - wireless is on
92 * TODO, verify 3G is correct, that doesn't seem right...
94 u16 get_wireless_button;
95 u16 set_wireless_button;
97 /* 0 is off, 1 is on */
102 * 0x80 or 0x00 - no action
103 * 0x81 - recovery key pressed
105 u16 get_recovery_mode;
106 u16 set_recovery_mode;
109 * on seclinux: 0 is low, 1 is high,
110 * on swsmi: 0 is normal, 1 is silent, 2 is turbo
112 u16 get_performance_level;
113 u16 set_performance_level;
115 /* 0x80 is off, 0x81 is on */
116 u16 get_battery_life_extender;
117 u16 set_battery_life_extender;
119 /* 0x80 is off, 0x81 is on */
123 /* the first byte is for bluetooth and the third one is for wlan */
124 u16 get_wireless_status;
125 u16 set_wireless_status;
127 /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
131 * Tell the BIOS that Linux is running on this machine.
132 * 81 is on, 80 is off
137 struct sabi_performance_level {
144 const char *test_string;
146 const struct sabi_header_offsets header_offsets;
147 const struct sabi_commands commands;
148 const struct sabi_performance_level performance_levels[4];
153 static const struct sabi_config sabi_configs[] = {
155 /* I don't know if it is really 2, but it it is
156 * less than 3 anyway */
159 .test_string = "SECLINUX",
161 .main_function = 0x4c49,
169 .data_segment = 0x07,
173 .get_brightness = 0x00,
174 .set_brightness = 0x01,
176 .get_wireless_button = 0x02,
177 .set_wireless_button = 0x03,
179 .get_backlight = 0x04,
180 .set_backlight = 0x05,
182 .get_recovery_mode = 0x06,
183 .set_recovery_mode = 0x07,
185 .get_performance_level = 0x08,
186 .set_performance_level = 0x09,
188 .get_battery_life_extender = 0xFFFF,
189 .set_battery_life_extender = 0xFFFF,
191 .get_usb_charge = 0xFFFF,
192 .set_usb_charge = 0xFFFF,
194 .get_wireless_status = 0xFFFF,
195 .set_wireless_status = 0xFFFF,
197 .kbd_backlight = 0xFFFF,
202 .performance_levels = {
219 .test_string = "SwSmi@",
221 .main_function = 0x5843,
229 .data_segment = 0x07,
233 .get_brightness = 0x10,
234 .set_brightness = 0x11,
236 .get_wireless_button = 0x12,
237 .set_wireless_button = 0x13,
239 .get_backlight = 0x2d,
240 .set_backlight = 0x2e,
242 .get_recovery_mode = 0xff,
243 .set_recovery_mode = 0xff,
245 .get_performance_level = 0x31,
246 .set_performance_level = 0x32,
248 .get_battery_life_extender = 0x65,
249 .set_battery_life_extender = 0x66,
251 .get_usb_charge = 0x67,
252 .set_usb_charge = 0x68,
254 .get_wireless_status = 0x69,
255 .set_wireless_status = 0x6a,
257 .kbd_backlight = 0x78,
262 .performance_levels = {
284 * samsung-laptop/ - debugfs root directory
285 * f0000_segment - dump f0000 segment
286 * command - current command
287 * data - current data
288 * d0, d1, d2, d3 - data fields
289 * call - call SABI using command and data
291 * This allow to call arbitrary sabi commands wihout
292 * modifying the driver at all.
293 * For example, setting the keyboard backlight brightness to 5
295 * echo 0x78 > command
303 struct samsung_laptop_debug {
305 struct sabi_data data;
308 struct debugfs_blob_wrapper f0000_wrapper;
309 struct debugfs_blob_wrapper data_wrapper;
310 struct debugfs_blob_wrapper sdiag_wrapper;
313 struct samsung_laptop;
315 struct samsung_rfkill {
316 struct samsung_laptop *samsung;
317 struct rfkill *rfkill;
318 enum rfkill_type type;
321 struct samsung_laptop {
322 const struct sabi_config *config;
325 void __iomem *sabi_iface;
326 void __iomem *f0000_segment;
328 struct mutex sabi_mutex;
330 struct platform_device *platform_device;
331 struct backlight_device *backlight_device;
333 struct samsung_rfkill wlan;
334 struct samsung_rfkill bluetooth;
336 struct led_classdev kbd_led;
338 struct workqueue_struct *led_workqueue;
339 struct work_struct kbd_led_work;
341 struct samsung_laptop_debug debug;
342 struct samsung_quirks *quirks;
344 struct notifier_block pm_nb;
346 bool handle_backlight;
347 bool has_stepping_quirk;
352 struct samsung_quirks {
353 bool broken_acpi_video;
354 bool four_kbd_backlight_levels;
355 bool enable_kbd_backlight;
358 static struct samsung_quirks samsung_unknown = {};
360 static struct samsung_quirks samsung_broken_acpi_video = {
361 .broken_acpi_video = true,
364 static struct samsung_quirks samsung_np740u3e = {
365 .four_kbd_backlight_levels = true,
366 .enable_kbd_backlight = true,
370 module_param(force, bool, 0);
371 MODULE_PARM_DESC(force,
372 "Disable the DMI check and forces the driver to be loaded");
375 module_param(debug, bool, S_IRUGO | S_IWUSR);
376 MODULE_PARM_DESC(debug, "Debug enabled or not");
378 static int sabi_command(struct samsung_laptop *samsung, u16 command,
379 struct sabi_data *in,
380 struct sabi_data *out)
382 const struct sabi_config *config = samsung->config;
384 u16 port = readw(samsung->sabi + config->header_offsets.port);
385 u8 complete, iface_data;
387 mutex_lock(&samsung->sabi_mutex);
391 pr_info("SABI command:0x%04x "
392 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
393 command, in->d0, in->d1, in->d2, in->d3);
395 pr_info("SABI command:0x%04x", command);
398 /* enable memory to be able to write to it */
399 outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
401 /* write out the command */
402 writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
403 writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
404 writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
406 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
407 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
408 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
409 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
411 outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
413 /* write protect memory to make it safe */
414 outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
416 /* see if the command actually succeeded */
417 complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
418 iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
420 /* iface_data = 0xFF happens when a command is not known
421 * so we only add a warning in debug mode since we will
422 * probably issue some unknown command at startup to find
423 * out which features are supported */
424 if (complete != 0xaa || (iface_data == 0xff && debug))
425 pr_warn("SABI command 0x%04x failed with"
426 " completion flag 0x%02x and interface data 0x%02x",
427 command, complete, iface_data);
429 if (complete != 0xaa || iface_data == 0xff) {
435 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
436 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
437 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
438 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
442 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
443 out->d0, out->d1, out->d2, out->d3);
447 mutex_unlock(&samsung->sabi_mutex);
451 /* simple wrappers usable with most commands */
452 static int sabi_set_commandb(struct samsung_laptop *samsung,
453 u16 command, u8 data)
455 struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
458 return sabi_command(samsung, command, &in, NULL);
461 static int read_brightness(struct samsung_laptop *samsung)
463 const struct sabi_config *config = samsung->config;
464 const struct sabi_commands *commands = &samsung->config->commands;
465 struct sabi_data sretval;
466 int user_brightness = 0;
469 retval = sabi_command(samsung, commands->get_brightness,
474 user_brightness = sretval.data[0];
475 if (user_brightness > config->min_brightness)
476 user_brightness -= config->min_brightness;
480 return user_brightness;
483 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
485 const struct sabi_config *config = samsung->config;
486 const struct sabi_commands *commands = &samsung->config->commands;
487 u8 user_level = user_brightness + config->min_brightness;
489 if (samsung->has_stepping_quirk && user_level != 0) {
491 * short circuit if the specified level is what's already set
492 * to prevent the screen from flickering needlessly
494 if (user_brightness == read_brightness(samsung))
497 sabi_set_commandb(samsung, commands->set_brightness, 0);
500 sabi_set_commandb(samsung, commands->set_brightness, user_level);
503 static int get_brightness(struct backlight_device *bd)
505 struct samsung_laptop *samsung = bl_get_data(bd);
507 return read_brightness(samsung);
510 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
514 int orig_level = read_brightness(samsung);
517 * Some laptops exhibit the strange behaviour of stepping toward
518 * (rather than setting) the brightness except when changing to/from
519 * brightness level 0. This behaviour is checked for here and worked
520 * around in set_brightness.
524 set_brightness(samsung, 1);
526 initial_level = read_brightness(samsung);
528 if (initial_level <= 2)
529 check_level = initial_level + 2;
531 check_level = initial_level - 2;
533 samsung->has_stepping_quirk = false;
534 set_brightness(samsung, check_level);
536 if (read_brightness(samsung) != check_level) {
537 samsung->has_stepping_quirk = true;
538 pr_info("enabled workaround for brightness stepping quirk\n");
541 set_brightness(samsung, orig_level);
544 static int update_status(struct backlight_device *bd)
546 struct samsung_laptop *samsung = bl_get_data(bd);
547 const struct sabi_commands *commands = &samsung->config->commands;
549 set_brightness(samsung, bd->props.brightness);
551 if (bd->props.power == FB_BLANK_UNBLANK)
552 sabi_set_commandb(samsung, commands->set_backlight, 1);
554 sabi_set_commandb(samsung, commands->set_backlight, 0);
559 static const struct backlight_ops backlight_ops = {
560 .get_brightness = get_brightness,
561 .update_status = update_status,
564 static int seclinux_rfkill_set(void *data, bool blocked)
566 struct samsung_rfkill *srfkill = data;
567 struct samsung_laptop *samsung = srfkill->samsung;
568 const struct sabi_commands *commands = &samsung->config->commands;
570 return sabi_set_commandb(samsung, commands->set_wireless_button,
574 static struct rfkill_ops seclinux_rfkill_ops = {
575 .set_block = seclinux_rfkill_set,
578 static int swsmi_wireless_status(struct samsung_laptop *samsung,
579 struct sabi_data *data)
581 const struct sabi_commands *commands = &samsung->config->commands;
583 return sabi_command(samsung, commands->get_wireless_status,
587 static int swsmi_rfkill_set(void *priv, bool blocked)
589 struct samsung_rfkill *srfkill = priv;
590 struct samsung_laptop *samsung = srfkill->samsung;
591 const struct sabi_commands *commands = &samsung->config->commands;
592 struct sabi_data data;
595 ret = swsmi_wireless_status(samsung, &data);
599 /* Don't set the state for non-present devices */
600 for (i = 0; i < 4; i++)
601 if (data.data[i] == 0x02)
604 if (srfkill->type == RFKILL_TYPE_WLAN)
605 data.data[WL_STATUS_WLAN] = !blocked;
606 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
607 data.data[WL_STATUS_BT] = !blocked;
609 return sabi_command(samsung, commands->set_wireless_status,
613 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
615 struct samsung_rfkill *srfkill = priv;
616 struct samsung_laptop *samsung = srfkill->samsung;
617 struct sabi_data data;
620 ret = swsmi_wireless_status(samsung, &data);
624 if (srfkill->type == RFKILL_TYPE_WLAN)
625 ret = data.data[WL_STATUS_WLAN];
626 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
627 ret = data.data[WL_STATUS_BT];
631 rfkill_set_sw_state(rfkill, !ret);
634 static struct rfkill_ops swsmi_rfkill_ops = {
635 .set_block = swsmi_rfkill_set,
636 .query = swsmi_rfkill_query,
639 static ssize_t get_performance_level(struct device *dev,
640 struct device_attribute *attr, char *buf)
642 struct samsung_laptop *samsung = dev_get_drvdata(dev);
643 const struct sabi_config *config = samsung->config;
644 const struct sabi_commands *commands = &config->commands;
645 struct sabi_data sretval;
650 retval = sabi_command(samsung, commands->get_performance_level,
655 /* The logic is backwards, yeah, lots of fun... */
656 for (i = 0; config->performance_levels[i].name; ++i) {
657 if (sretval.data[0] == config->performance_levels[i].value)
658 return sprintf(buf, "%s\n", config->performance_levels[i].name);
660 return sprintf(buf, "%s\n", "unknown");
663 static ssize_t set_performance_level(struct device *dev,
664 struct device_attribute *attr, const char *buf,
667 struct samsung_laptop *samsung = dev_get_drvdata(dev);
668 const struct sabi_config *config = samsung->config;
669 const struct sabi_commands *commands = &config->commands;
675 for (i = 0; config->performance_levels[i].name; ++i) {
676 const struct sabi_performance_level *level =
677 &config->performance_levels[i];
678 if (!strncasecmp(level->name, buf, strlen(level->name))) {
679 sabi_set_commandb(samsung,
680 commands->set_performance_level,
686 if (!config->performance_levels[i].name)
692 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
693 get_performance_level, set_performance_level);
695 static int read_battery_life_extender(struct samsung_laptop *samsung)
697 const struct sabi_commands *commands = &samsung->config->commands;
698 struct sabi_data data;
701 if (commands->get_battery_life_extender == 0xFFFF)
704 memset(&data, 0, sizeof(data));
706 retval = sabi_command(samsung, commands->get_battery_life_extender,
712 if (data.data[0] != 0 && data.data[0] != 1)
718 static int write_battery_life_extender(struct samsung_laptop *samsung,
721 const struct sabi_commands *commands = &samsung->config->commands;
722 struct sabi_data data;
724 memset(&data, 0, sizeof(data));
725 data.data[0] = 0x80 | enabled;
726 return sabi_command(samsung, commands->set_battery_life_extender,
730 static ssize_t get_battery_life_extender(struct device *dev,
731 struct device_attribute *attr,
734 struct samsung_laptop *samsung = dev_get_drvdata(dev);
737 ret = read_battery_life_extender(samsung);
741 return sprintf(buf, "%d\n", ret);
744 static ssize_t set_battery_life_extender(struct device *dev,
745 struct device_attribute *attr,
746 const char *buf, size_t count)
748 struct samsung_laptop *samsung = dev_get_drvdata(dev);
751 if (!count || sscanf(buf, "%i", &value) != 1)
754 ret = write_battery_life_extender(samsung, !!value);
761 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
762 get_battery_life_extender, set_battery_life_extender);
764 static int read_usb_charge(struct samsung_laptop *samsung)
766 const struct sabi_commands *commands = &samsung->config->commands;
767 struct sabi_data data;
770 if (commands->get_usb_charge == 0xFFFF)
773 memset(&data, 0, sizeof(data));
775 retval = sabi_command(samsung, commands->get_usb_charge,
781 if (data.data[0] != 0 && data.data[0] != 1)
787 static int write_usb_charge(struct samsung_laptop *samsung,
790 const struct sabi_commands *commands = &samsung->config->commands;
791 struct sabi_data data;
793 memset(&data, 0, sizeof(data));
794 data.data[0] = 0x80 | enabled;
795 return sabi_command(samsung, commands->set_usb_charge,
799 static ssize_t get_usb_charge(struct device *dev,
800 struct device_attribute *attr,
803 struct samsung_laptop *samsung = dev_get_drvdata(dev);
806 ret = read_usb_charge(samsung);
810 return sprintf(buf, "%d\n", ret);
813 static ssize_t set_usb_charge(struct device *dev,
814 struct device_attribute *attr,
815 const char *buf, size_t count)
817 struct samsung_laptop *samsung = dev_get_drvdata(dev);
820 if (!count || sscanf(buf, "%i", &value) != 1)
823 ret = write_usb_charge(samsung, !!value);
830 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
831 get_usb_charge, set_usb_charge);
833 static struct attribute *platform_attributes[] = {
834 &dev_attr_performance_level.attr,
835 &dev_attr_battery_life_extender.attr,
836 &dev_attr_usb_charge.attr,
840 static int find_signature(void __iomem *memcheck, const char *testStr)
845 for (loca = 0; loca < 0xffff; loca++) {
846 char temp = readb(memcheck + loca);
848 if (temp == testStr[i]) {
849 if (i == strlen(testStr)-1)
859 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
861 if (samsung->wlan.rfkill) {
862 rfkill_unregister(samsung->wlan.rfkill);
863 rfkill_destroy(samsung->wlan.rfkill);
864 samsung->wlan.rfkill = NULL;
866 if (samsung->bluetooth.rfkill) {
867 rfkill_unregister(samsung->bluetooth.rfkill);
868 rfkill_destroy(samsung->bluetooth.rfkill);
869 samsung->bluetooth.rfkill = NULL;
873 static int samsung_new_rfkill(struct samsung_laptop *samsung,
874 struct samsung_rfkill *arfkill,
875 const char *name, enum rfkill_type type,
876 const struct rfkill_ops *ops,
879 struct rfkill **rfkill = &arfkill->rfkill;
882 arfkill->type = type;
883 arfkill->samsung = samsung;
885 *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
892 rfkill_init_sw_state(*rfkill, blocked);
894 ret = rfkill_register(*rfkill);
896 rfkill_destroy(*rfkill);
903 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
905 return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
906 RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
909 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
911 struct sabi_data data;
914 ret = swsmi_wireless_status(samsung, &data);
916 /* Some swsmi laptops use the old seclinux way to control
917 * wireless devices */
919 ret = samsung_rfkill_init_seclinux(samsung);
923 /* 0x02 seems to mean that the device is no present/available */
925 if (data.data[WL_STATUS_WLAN] != 0x02)
926 ret = samsung_new_rfkill(samsung, &samsung->wlan,
930 !data.data[WL_STATUS_WLAN]);
934 if (data.data[WL_STATUS_BT] != 0x02)
935 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
937 RFKILL_TYPE_BLUETOOTH,
939 !data.data[WL_STATUS_BT]);
945 samsung_rfkill_exit(samsung);
950 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
952 if (samsung->config->sabi_version == 2)
953 return samsung_rfkill_init_seclinux(samsung);
954 if (samsung->config->sabi_version == 3)
955 return samsung_rfkill_init_swsmi(samsung);
959 static int kbd_backlight_enable(struct samsung_laptop *samsung)
961 const struct sabi_commands *commands = &samsung->config->commands;
962 struct sabi_data data;
965 if (commands->kbd_backlight == 0xFFFF)
968 memset(&data, 0, sizeof(data));
970 retval = sabi_command(samsung, commands->kbd_backlight,
976 if (data.d0 != 0xccdd)
981 static int kbd_backlight_read(struct samsung_laptop *samsung)
983 const struct sabi_commands *commands = &samsung->config->commands;
984 struct sabi_data data;
987 memset(&data, 0, sizeof(data));
989 retval = sabi_command(samsung, commands->kbd_backlight,
998 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
1000 const struct sabi_commands *commands = &samsung->config->commands;
1001 struct sabi_data data;
1003 memset(&data, 0, sizeof(data));
1004 data.d0 = 0x82 | ((brightness & 0xFF) << 8);
1005 return sabi_command(samsung, commands->kbd_backlight,
1009 static void kbd_led_update(struct work_struct *work)
1011 struct samsung_laptop *samsung;
1013 samsung = container_of(work, struct samsung_laptop, kbd_led_work);
1014 kbd_backlight_write(samsung, samsung->kbd_led_wk);
1017 static void kbd_led_set(struct led_classdev *led_cdev,
1018 enum led_brightness value)
1020 struct samsung_laptop *samsung;
1022 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1024 if (value > samsung->kbd_led.max_brightness)
1025 value = samsung->kbd_led.max_brightness;
1029 samsung->kbd_led_wk = value;
1030 queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1033 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1035 struct samsung_laptop *samsung;
1037 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1038 return kbd_backlight_read(samsung);
1041 static void samsung_leds_exit(struct samsung_laptop *samsung)
1043 if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1044 led_classdev_unregister(&samsung->kbd_led);
1045 if (samsung->led_workqueue)
1046 destroy_workqueue(samsung->led_workqueue);
1049 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1053 samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1054 if (!samsung->led_workqueue)
1057 if (kbd_backlight_enable(samsung) >= 0) {
1058 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1060 samsung->kbd_led.name = "samsung::kbd_backlight";
1061 samsung->kbd_led.brightness_set = kbd_led_set;
1062 samsung->kbd_led.brightness_get = kbd_led_get;
1063 samsung->kbd_led.max_brightness = 8;
1064 if (samsung->quirks->four_kbd_backlight_levels)
1065 samsung->kbd_led.max_brightness = 4;
1067 ret = led_classdev_register(&samsung->platform_device->dev,
1072 samsung_leds_exit(samsung);
1077 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1079 if (samsung->backlight_device) {
1080 backlight_device_unregister(samsung->backlight_device);
1081 samsung->backlight_device = NULL;
1085 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1087 struct backlight_device *bd;
1088 struct backlight_properties props;
1090 if (!samsung->handle_backlight)
1093 memset(&props, 0, sizeof(struct backlight_properties));
1094 props.type = BACKLIGHT_PLATFORM;
1095 props.max_brightness = samsung->config->max_brightness -
1096 samsung->config->min_brightness;
1098 bd = backlight_device_register("samsung",
1099 &samsung->platform_device->dev,
1100 samsung, &backlight_ops,
1105 samsung->backlight_device = bd;
1106 samsung->backlight_device->props.brightness = read_brightness(samsung);
1107 samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1108 backlight_update_status(samsung->backlight_device);
1113 static umode_t samsung_sysfs_is_visible(struct kobject *kobj,
1114 struct attribute *attr, int idx)
1116 struct device *dev = container_of(kobj, struct device, kobj);
1117 struct platform_device *pdev = to_platform_device(dev);
1118 struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1121 if (attr == &dev_attr_performance_level.attr)
1122 ok = !!samsung->config->performance_levels[0].name;
1123 if (attr == &dev_attr_battery_life_extender.attr)
1124 ok = !!(read_battery_life_extender(samsung) >= 0);
1125 if (attr == &dev_attr_usb_charge.attr)
1126 ok = !!(read_usb_charge(samsung) >= 0);
1128 return ok ? attr->mode : 0;
1131 static struct attribute_group platform_attribute_group = {
1132 .is_visible = samsung_sysfs_is_visible,
1133 .attrs = platform_attributes
1136 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1138 struct platform_device *device = samsung->platform_device;
1140 sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1143 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1145 struct platform_device *device = samsung->platform_device;
1147 return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1151 static int show_call(struct seq_file *m, void *data)
1153 struct samsung_laptop *samsung = m->private;
1154 struct sabi_data *sdata = &samsung->debug.data;
1157 seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1158 samsung->debug.command,
1159 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1161 ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1164 seq_printf(m, "SABI command 0x%04x failed\n",
1165 samsung->debug.command);
1169 seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1170 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1174 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1176 return single_open(file, show_call, inode->i_private);
1179 static const struct file_operations samsung_laptop_call_io_ops = {
1180 .owner = THIS_MODULE,
1181 .open = samsung_debugfs_open,
1183 .llseek = seq_lseek,
1184 .release = single_release,
1187 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1189 debugfs_remove_recursive(samsung->debug.root);
1192 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1194 struct dentry *dent;
1196 samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1197 if (!samsung->debug.root) {
1198 pr_err("failed to create debugfs directory");
1202 samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1203 samsung->debug.f0000_wrapper.size = 0xffff;
1205 samsung->debug.data_wrapper.data = &samsung->debug.data;
1206 samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1208 samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1209 samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1211 dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1212 samsung->debug.root, &samsung->debug.command);
1216 dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1217 &samsung->debug.data.d0);
1221 dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1222 &samsung->debug.data.d1);
1226 dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1227 &samsung->debug.data.d2);
1231 dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1232 &samsung->debug.data.d3);
1236 dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1237 samsung->debug.root,
1238 &samsung->debug.data_wrapper);
1242 dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1243 samsung->debug.root,
1244 &samsung->debug.f0000_wrapper);
1248 dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1249 samsung->debug.root, samsung,
1250 &samsung_laptop_call_io_ops);
1254 dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1255 samsung->debug.root,
1256 &samsung->debug.sdiag_wrapper);
1263 samsung_debugfs_exit(samsung);
1267 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1269 const struct sabi_config *config = samsung->config;
1271 /* Turn off "Linux" mode in the BIOS */
1272 if (config && config->commands.set_linux != 0xff)
1273 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1275 if (samsung->sabi_iface) {
1276 iounmap(samsung->sabi_iface);
1277 samsung->sabi_iface = NULL;
1279 if (samsung->f0000_segment) {
1280 iounmap(samsung->f0000_segment);
1281 samsung->f0000_segment = NULL;
1284 samsung->config = NULL;
1287 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1288 unsigned int ifaceP)
1290 const struct sabi_config *config = samsung->config;
1292 printk(KERN_DEBUG "This computer supports SABI==%x\n",
1293 loca + 0xf0000 - 6);
1295 printk(KERN_DEBUG "SABI header:\n");
1296 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1297 readw(samsung->sabi + config->header_offsets.port));
1298 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1299 readb(samsung->sabi + config->header_offsets.iface_func));
1300 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1301 readb(samsung->sabi + config->header_offsets.en_mem));
1302 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1303 readb(samsung->sabi + config->header_offsets.re_mem));
1304 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1305 readw(samsung->sabi + config->header_offsets.data_offset));
1306 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1307 readw(samsung->sabi + config->header_offsets.data_segment));
1309 printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1312 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1314 int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1321 * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1323 * Product name: 90X3A
1324 * BIOS Version: 07HL
1327 for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1328 char temp = readb(samsung->f0000_segment + loca);
1330 if (isalnum(temp) || temp == '/' || temp == '-')
1331 samsung->sdiag[i++] = temp;
1336 if (debug && samsung->sdiag[0])
1337 pr_info("sdiag: %s", samsung->sdiag);
1340 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1342 const struct sabi_config *config = NULL;
1343 const struct sabi_commands *commands;
1344 unsigned int ifaceP;
1349 samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1350 if (!samsung->f0000_segment) {
1352 pr_err("Can't map the segment at 0xf0000\n");
1357 samsung_sabi_diag(samsung);
1359 /* Try to find one of the signatures in memory to find the header */
1360 for (i = 0; sabi_configs[i].test_string != 0; ++i) {
1361 samsung->config = &sabi_configs[i];
1362 loca = find_signature(samsung->f0000_segment,
1363 samsung->config->test_string);
1368 if (loca == 0xffff) {
1370 pr_err("This computer does not support SABI\n");
1375 config = samsung->config;
1376 commands = &config->commands;
1378 /* point to the SMI port Number */
1380 samsung->sabi = (samsung->f0000_segment + loca);
1382 /* Get a pointer to the SABI Interface */
1383 ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1384 ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1387 samsung_sabi_infos(samsung, loca, ifaceP);
1389 samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1390 if (!samsung->sabi_iface) {
1391 pr_err("Can't remap %x\n", ifaceP);
1396 /* Turn on "Linux" mode in the BIOS */
1397 if (commands->set_linux != 0xff) {
1398 int retval = sabi_set_commandb(samsung,
1399 commands->set_linux, 0x81);
1401 pr_warn("Linux mode was not set!\n");
1407 /* Check for stepping quirk */
1408 if (samsung->handle_backlight)
1409 check_for_stepping_quirk(samsung);
1411 pr_info("detected SABI interface: %s\n",
1412 samsung->config->test_string);
1416 samsung_sabi_exit(samsung);
1421 static void samsung_platform_exit(struct samsung_laptop *samsung)
1423 if (samsung->platform_device) {
1424 platform_device_unregister(samsung->platform_device);
1425 samsung->platform_device = NULL;
1429 static int samsung_pm_notification(struct notifier_block *nb,
1430 unsigned long val, void *ptr)
1432 struct samsung_laptop *samsung;
1434 samsung = container_of(nb, struct samsung_laptop, pm_nb);
1435 if (val == PM_POST_HIBERNATION &&
1436 samsung->quirks->enable_kbd_backlight)
1437 kbd_backlight_enable(samsung);
1442 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1444 struct platform_device *pdev;
1446 pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1448 return PTR_ERR(pdev);
1450 samsung->platform_device = pdev;
1451 platform_set_drvdata(samsung->platform_device, samsung);
1455 static struct samsung_quirks *quirks;
1457 static int __init samsung_dmi_matched(const struct dmi_system_id *d)
1459 quirks = d->driver_data;
1463 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1466 DMI_MATCH(DMI_SYS_VENDOR,
1467 "SAMSUNG ELECTRONICS CO., LTD."),
1468 DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1473 DMI_MATCH(DMI_SYS_VENDOR,
1474 "SAMSUNG ELECTRONICS CO., LTD."),
1475 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1480 DMI_MATCH(DMI_SYS_VENDOR,
1481 "SAMSUNG ELECTRONICS CO., LTD."),
1482 DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1487 DMI_MATCH(DMI_SYS_VENDOR,
1488 "SAMSUNG ELECTRONICS CO., LTD."),
1489 DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1492 /* DMI ids for laptops with bad Chassis Type */
1496 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1497 DMI_MATCH(DMI_PRODUCT_NAME, "R40/R41"),
1498 DMI_MATCH(DMI_BOARD_NAME, "R40/R41"),
1501 /* Specific DMI ids for laptop with quirks */
1503 .callback = samsung_dmi_matched,
1506 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1507 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
1508 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
1510 .driver_data = &samsung_broken_acpi_video,
1513 .callback = samsung_dmi_matched,
1514 .ident = "N145P/N250P/N260P",
1516 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1517 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
1518 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
1520 .driver_data = &samsung_broken_acpi_video,
1523 .callback = samsung_dmi_matched,
1524 .ident = "N150/N210/N220",
1526 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1527 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
1528 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
1530 .driver_data = &samsung_broken_acpi_video,
1533 .callback = samsung_dmi_matched,
1534 .ident = "NF110/NF210/NF310",
1536 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1537 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
1538 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
1540 .driver_data = &samsung_broken_acpi_video,
1543 .callback = samsung_dmi_matched,
1546 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1547 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
1548 DMI_MATCH(DMI_BOARD_NAME, "X360"),
1550 .driver_data = &samsung_broken_acpi_video,
1553 .callback = samsung_dmi_matched,
1556 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1557 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
1558 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
1560 .driver_data = &samsung_broken_acpi_video,
1563 .callback = samsung_dmi_matched,
1566 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1567 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
1568 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
1570 .driver_data = &samsung_broken_acpi_video,
1573 .callback = samsung_dmi_matched,
1574 .ident = "730U3E/740U3E",
1576 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
1577 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
1579 .driver_data = &samsung_np740u3e,
1583 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1585 static struct platform_device *samsung_platform_device;
1587 static int __init samsung_init(void)
1589 struct samsung_laptop *samsung;
1592 if (efi_enabled(EFI_BOOT))
1595 quirks = &samsung_unknown;
1596 if (!force && !dmi_check_system(samsung_dmi_table))
1599 samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1603 mutex_init(&samsung->sabi_mutex);
1604 samsung->handle_backlight = true;
1605 samsung->quirks = quirks;
1609 if (samsung->quirks->broken_acpi_video)
1610 acpi_video_dmi_promote_vendor();
1612 /* Don't handle backlight here if the acpi video already handle it */
1613 if (acpi_video_backlight_support()) {
1614 samsung->handle_backlight = false;
1615 } else if (samsung->quirks->broken_acpi_video) {
1616 pr_info("Disabling ACPI video driver\n");
1617 acpi_video_unregister();
1621 ret = samsung_platform_init(samsung);
1623 goto error_platform;
1625 ret = samsung_sabi_init(samsung);
1630 /* Only log that if we are really on a sabi platform */
1631 if (acpi_video_backlight_support())
1632 pr_info("Backlight controlled by ACPI video driver\n");
1635 ret = samsung_sysfs_init(samsung);
1639 ret = samsung_backlight_init(samsung);
1641 goto error_backlight;
1643 ret = samsung_rfkill_init(samsung);
1647 ret = samsung_leds_init(samsung);
1651 ret = samsung_debugfs_init(samsung);
1655 samsung->pm_nb.notifier_call = samsung_pm_notification;
1656 register_pm_notifier(&samsung->pm_nb);
1658 samsung_platform_device = samsung->platform_device;
1662 samsung_leds_exit(samsung);
1664 samsung_rfkill_exit(samsung);
1666 samsung_backlight_exit(samsung);
1668 samsung_sysfs_exit(samsung);
1670 samsung_sabi_exit(samsung);
1672 samsung_platform_exit(samsung);
1678 static void __exit samsung_exit(void)
1680 struct samsung_laptop *samsung;
1682 samsung = platform_get_drvdata(samsung_platform_device);
1683 unregister_pm_notifier(&samsung->pm_nb);
1685 samsung_debugfs_exit(samsung);
1686 samsung_leds_exit(samsung);
1687 samsung_rfkill_exit(samsung);
1688 samsung_backlight_exit(samsung);
1689 samsung_sysfs_exit(samsung);
1690 samsung_sabi_exit(samsung);
1691 samsung_platform_exit(samsung);
1694 samsung_platform_device = NULL;
1697 module_init(samsung_init);
1698 module_exit(samsung_exit);
1700 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1701 MODULE_DESCRIPTION("Samsung Backlight driver");
1702 MODULE_LICENSE("GPL");