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>
30 * This driver is needed because a number of Samsung laptops do not hook
31 * their control settings through ACPI. So we have to poke around in the
32 * BIOS to do things like brightness values, and "special" key controls.
36 * We have 0 - 8 as valid brightness levels. The specs say that level 0 should
37 * be reserved by the BIOS (which really doesn't make much sense), we tell
38 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
40 #define MAX_BRIGHT 0x07
43 #define SABI_IFACE_MAIN 0x00
44 #define SABI_IFACE_SUB 0x02
45 #define SABI_IFACE_COMPLETE 0x04
46 #define SABI_IFACE_DATA 0x05
48 #define WL_STATUS_WLAN 0x0
49 #define WL_STATUS_BT 0x2
51 /* Structure get/set data using sabi */
64 struct sabi_header_offsets {
73 struct sabi_commands {
75 * Brightness is 0 - 8, as described above.
76 * Value 0 is for the BIOS to use
83 * 0x00 - wireless is off
84 * 0x01 - wireless is on
88 * TODO, verify 3G is correct, that doesn't seem right...
90 u16 get_wireless_button;
91 u16 set_wireless_button;
93 /* 0 is off, 1 is on */
98 * 0x80 or 0x00 - no action
99 * 0x81 - recovery key pressed
101 u16 get_recovery_mode;
102 u16 set_recovery_mode;
105 * on seclinux: 0 is low, 1 is high,
106 * on swsmi: 0 is normal, 1 is silent, 2 is turbo
108 u16 get_performance_level;
109 u16 set_performance_level;
111 /* 0x80 is off, 0x81 is on */
112 u16 get_battery_life_extender;
113 u16 set_battery_life_extender;
115 /* 0x80 is off, 0x81 is on */
119 /* the first byte is for bluetooth and the third one is for wlan */
120 u16 get_wireless_status;
121 u16 set_wireless_status;
123 /* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
127 * Tell the BIOS that Linux is running on this machine.
128 * 81 is on, 80 is off
133 struct sabi_performance_level {
140 const char *test_string;
142 const struct sabi_header_offsets header_offsets;
143 const struct sabi_commands commands;
144 const struct sabi_performance_level performance_levels[4];
149 static const struct sabi_config sabi_configs[] = {
151 /* I don't know if it is really 2, but it it is
152 * less than 3 anyway */
155 .test_string = "SECLINUX",
157 .main_function = 0x4c49,
165 .data_segment = 0x07,
169 .get_brightness = 0x00,
170 .set_brightness = 0x01,
172 .get_wireless_button = 0x02,
173 .set_wireless_button = 0x03,
175 .get_backlight = 0x04,
176 .set_backlight = 0x05,
178 .get_recovery_mode = 0x06,
179 .set_recovery_mode = 0x07,
181 .get_performance_level = 0x08,
182 .set_performance_level = 0x09,
184 .get_battery_life_extender = 0xFFFF,
185 .set_battery_life_extender = 0xFFFF,
187 .get_usb_charge = 0xFFFF,
188 .set_usb_charge = 0xFFFF,
190 .get_wireless_status = 0xFFFF,
191 .set_wireless_status = 0xFFFF,
193 .kbd_backlight = 0xFFFF,
198 .performance_levels = {
215 .test_string = "SwSmi@",
217 .main_function = 0x5843,
225 .data_segment = 0x07,
229 .get_brightness = 0x10,
230 .set_brightness = 0x11,
232 .get_wireless_button = 0x12,
233 .set_wireless_button = 0x13,
235 .get_backlight = 0x2d,
236 .set_backlight = 0x2e,
238 .get_recovery_mode = 0xff,
239 .set_recovery_mode = 0xff,
241 .get_performance_level = 0x31,
242 .set_performance_level = 0x32,
244 .get_battery_life_extender = 0x65,
245 .set_battery_life_extender = 0x66,
247 .get_usb_charge = 0x67,
248 .set_usb_charge = 0x68,
250 .get_wireless_status = 0x69,
251 .set_wireless_status = 0x6a,
253 .kbd_backlight = 0x78,
258 .performance_levels = {
280 * samsung-laptop/ - debugfs root directory
281 * f0000_segment - dump f0000 segment
282 * command - current command
283 * data - current data
284 * d0, d1, d2, d3 - data fields
285 * call - call SABI using command and data
287 * This allow to call arbitrary sabi commands wihout
288 * modifying the driver at all.
289 * For example, setting the keyboard backlight brightness to 5
291 * echo 0x78 > command
299 struct samsung_laptop_debug {
301 struct sabi_data data;
304 struct debugfs_blob_wrapper f0000_wrapper;
305 struct debugfs_blob_wrapper data_wrapper;
306 struct debugfs_blob_wrapper sdiag_wrapper;
309 struct samsung_laptop;
311 struct samsung_rfkill {
312 struct samsung_laptop *samsung;
313 struct rfkill *rfkill;
314 enum rfkill_type type;
317 struct samsung_laptop {
318 const struct sabi_config *config;
321 void __iomem *sabi_iface;
322 void __iomem *f0000_segment;
324 struct mutex sabi_mutex;
326 struct platform_device *platform_device;
327 struct backlight_device *backlight_device;
329 struct samsung_rfkill wlan;
330 struct samsung_rfkill bluetooth;
332 struct led_classdev kbd_led;
334 struct workqueue_struct *led_workqueue;
335 struct work_struct kbd_led_work;
337 struct samsung_laptop_debug debug;
339 bool handle_backlight;
340 bool has_stepping_quirk;
348 module_param(force, bool, 0);
349 MODULE_PARM_DESC(force,
350 "Disable the DMI check and forces the driver to be loaded");
353 module_param(debug, bool, S_IRUGO | S_IWUSR);
354 MODULE_PARM_DESC(debug, "Debug enabled or not");
356 static int sabi_command(struct samsung_laptop *samsung, u16 command,
357 struct sabi_data *in,
358 struct sabi_data *out)
360 const struct sabi_config *config = samsung->config;
362 u16 port = readw(samsung->sabi + config->header_offsets.port);
363 u8 complete, iface_data;
365 mutex_lock(&samsung->sabi_mutex);
369 pr_info("SABI command:0x%04x "
370 "data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
371 command, in->d0, in->d1, in->d2, in->d3);
373 pr_info("SABI command:0x%04x", command);
376 /* enable memory to be able to write to it */
377 outb(readb(samsung->sabi + config->header_offsets.en_mem), port);
379 /* write out the command */
380 writew(config->main_function, samsung->sabi_iface + SABI_IFACE_MAIN);
381 writew(command, samsung->sabi_iface + SABI_IFACE_SUB);
382 writeb(0, samsung->sabi_iface + SABI_IFACE_COMPLETE);
384 writel(in->d0, samsung->sabi_iface + SABI_IFACE_DATA);
385 writel(in->d1, samsung->sabi_iface + SABI_IFACE_DATA + 4);
386 writew(in->d2, samsung->sabi_iface + SABI_IFACE_DATA + 8);
387 writeb(in->d3, samsung->sabi_iface + SABI_IFACE_DATA + 10);
389 outb(readb(samsung->sabi + config->header_offsets.iface_func), port);
391 /* write protect memory to make it safe */
392 outb(readb(samsung->sabi + config->header_offsets.re_mem), port);
394 /* see if the command actually succeeded */
395 complete = readb(samsung->sabi_iface + SABI_IFACE_COMPLETE);
396 iface_data = readb(samsung->sabi_iface + SABI_IFACE_DATA);
398 /* iface_data = 0xFF happens when a command is not known
399 * so we only add a warning in debug mode since we will
400 * probably issue some unknown command at startup to find
401 * out which features are supported */
402 if (complete != 0xaa || (iface_data == 0xff && debug))
403 pr_warn("SABI command 0x%04x failed with"
404 " completion flag 0x%02x and interface data 0x%02x",
405 command, complete, iface_data);
407 if (complete != 0xaa || iface_data == 0xff) {
413 out->d0 = readl(samsung->sabi_iface + SABI_IFACE_DATA);
414 out->d1 = readl(samsung->sabi_iface + SABI_IFACE_DATA + 4);
415 out->d2 = readw(samsung->sabi_iface + SABI_IFACE_DATA + 2);
416 out->d3 = readb(samsung->sabi_iface + SABI_IFACE_DATA + 1);
420 pr_info("SABI return data:{0x%08x, 0x%08x, 0x%04x, 0x%02x}",
421 out->d0, out->d1, out->d2, out->d3);
425 mutex_unlock(&samsung->sabi_mutex);
429 /* simple wrappers usable with most commands */
430 static int sabi_set_commandb(struct samsung_laptop *samsung,
431 u16 command, u8 data)
433 struct sabi_data in = { { { .d0 = 0, .d1 = 0, .d2 = 0, .d3 = 0 } } };
436 return sabi_command(samsung, command, &in, NULL);
439 static int read_brightness(struct samsung_laptop *samsung)
441 const struct sabi_config *config = samsung->config;
442 const struct sabi_commands *commands = &samsung->config->commands;
443 struct sabi_data sretval;
444 int user_brightness = 0;
447 retval = sabi_command(samsung, commands->get_brightness,
452 user_brightness = sretval.data[0];
453 if (user_brightness > config->min_brightness)
454 user_brightness -= config->min_brightness;
458 return user_brightness;
461 static void set_brightness(struct samsung_laptop *samsung, u8 user_brightness)
463 const struct sabi_config *config = samsung->config;
464 const struct sabi_commands *commands = &samsung->config->commands;
465 u8 user_level = user_brightness + config->min_brightness;
467 if (samsung->has_stepping_quirk && user_level != 0) {
469 * short circuit if the specified level is what's already set
470 * to prevent the screen from flickering needlessly
472 if (user_brightness == read_brightness(samsung))
475 sabi_set_commandb(samsung, commands->set_brightness, 0);
478 sabi_set_commandb(samsung, commands->set_brightness, user_level);
481 static int get_brightness(struct backlight_device *bd)
483 struct samsung_laptop *samsung = bl_get_data(bd);
485 return read_brightness(samsung);
488 static void check_for_stepping_quirk(struct samsung_laptop *samsung)
492 int orig_level = read_brightness(samsung);
495 * Some laptops exhibit the strange behaviour of stepping toward
496 * (rather than setting) the brightness except when changing to/from
497 * brightness level 0. This behaviour is checked for here and worked
498 * around in set_brightness.
502 set_brightness(samsung, 1);
504 initial_level = read_brightness(samsung);
506 if (initial_level <= 2)
507 check_level = initial_level + 2;
509 check_level = initial_level - 2;
511 samsung->has_stepping_quirk = false;
512 set_brightness(samsung, check_level);
514 if (read_brightness(samsung) != check_level) {
515 samsung->has_stepping_quirk = true;
516 pr_info("enabled workaround for brightness stepping quirk\n");
519 set_brightness(samsung, orig_level);
522 static int update_status(struct backlight_device *bd)
524 struct samsung_laptop *samsung = bl_get_data(bd);
525 const struct sabi_commands *commands = &samsung->config->commands;
527 set_brightness(samsung, bd->props.brightness);
529 if (bd->props.power == FB_BLANK_UNBLANK)
530 sabi_set_commandb(samsung, commands->set_backlight, 1);
532 sabi_set_commandb(samsung, commands->set_backlight, 0);
537 static const struct backlight_ops backlight_ops = {
538 .get_brightness = get_brightness,
539 .update_status = update_status,
542 static int seclinux_rfkill_set(void *data, bool blocked)
544 struct samsung_rfkill *srfkill = data;
545 struct samsung_laptop *samsung = srfkill->samsung;
546 const struct sabi_commands *commands = &samsung->config->commands;
548 return sabi_set_commandb(samsung, commands->set_wireless_button,
552 static struct rfkill_ops seclinux_rfkill_ops = {
553 .set_block = seclinux_rfkill_set,
556 static int swsmi_wireless_status(struct samsung_laptop *samsung,
557 struct sabi_data *data)
559 const struct sabi_commands *commands = &samsung->config->commands;
561 return sabi_command(samsung, commands->get_wireless_status,
565 static int swsmi_rfkill_set(void *priv, bool blocked)
567 struct samsung_rfkill *srfkill = priv;
568 struct samsung_laptop *samsung = srfkill->samsung;
569 const struct sabi_commands *commands = &samsung->config->commands;
570 struct sabi_data data;
573 ret = swsmi_wireless_status(samsung, &data);
577 /* Don't set the state for non-present devices */
578 for (i = 0; i < 4; i++)
579 if (data.data[i] == 0x02)
582 if (srfkill->type == RFKILL_TYPE_WLAN)
583 data.data[WL_STATUS_WLAN] = !blocked;
584 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
585 data.data[WL_STATUS_BT] = !blocked;
587 return sabi_command(samsung, commands->set_wireless_status,
591 static void swsmi_rfkill_query(struct rfkill *rfkill, void *priv)
593 struct samsung_rfkill *srfkill = priv;
594 struct samsung_laptop *samsung = srfkill->samsung;
595 struct sabi_data data;
598 ret = swsmi_wireless_status(samsung, &data);
602 if (srfkill->type == RFKILL_TYPE_WLAN)
603 ret = data.data[WL_STATUS_WLAN];
604 else if (srfkill->type == RFKILL_TYPE_BLUETOOTH)
605 ret = data.data[WL_STATUS_BT];
609 rfkill_set_sw_state(rfkill, !ret);
612 static struct rfkill_ops swsmi_rfkill_ops = {
613 .set_block = swsmi_rfkill_set,
614 .query = swsmi_rfkill_query,
617 static ssize_t get_performance_level(struct device *dev,
618 struct device_attribute *attr, char *buf)
620 struct samsung_laptop *samsung = dev_get_drvdata(dev);
621 const struct sabi_config *config = samsung->config;
622 const struct sabi_commands *commands = &config->commands;
623 struct sabi_data sretval;
628 retval = sabi_command(samsung, commands->get_performance_level,
633 /* The logic is backwards, yeah, lots of fun... */
634 for (i = 0; config->performance_levels[i].name; ++i) {
635 if (sretval.data[0] == config->performance_levels[i].value)
636 return sprintf(buf, "%s\n", config->performance_levels[i].name);
638 return sprintf(buf, "%s\n", "unknown");
641 static ssize_t set_performance_level(struct device *dev,
642 struct device_attribute *attr, const char *buf,
645 struct samsung_laptop *samsung = dev_get_drvdata(dev);
646 const struct sabi_config *config = samsung->config;
647 const struct sabi_commands *commands = &config->commands;
653 for (i = 0; config->performance_levels[i].name; ++i) {
654 const struct sabi_performance_level *level =
655 &config->performance_levels[i];
656 if (!strncasecmp(level->name, buf, strlen(level->name))) {
657 sabi_set_commandb(samsung,
658 commands->set_performance_level,
664 if (!config->performance_levels[i].name)
670 static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO,
671 get_performance_level, set_performance_level);
673 static int read_battery_life_extender(struct samsung_laptop *samsung)
675 const struct sabi_commands *commands = &samsung->config->commands;
676 struct sabi_data data;
679 if (commands->get_battery_life_extender == 0xFFFF)
682 memset(&data, 0, sizeof(data));
684 retval = sabi_command(samsung, commands->get_battery_life_extender,
690 if (data.data[0] != 0 && data.data[0] != 1)
696 static int write_battery_life_extender(struct samsung_laptop *samsung,
699 const struct sabi_commands *commands = &samsung->config->commands;
700 struct sabi_data data;
702 memset(&data, 0, sizeof(data));
703 data.data[0] = 0x80 | enabled;
704 return sabi_command(samsung, commands->set_battery_life_extender,
708 static ssize_t get_battery_life_extender(struct device *dev,
709 struct device_attribute *attr,
712 struct samsung_laptop *samsung = dev_get_drvdata(dev);
715 ret = read_battery_life_extender(samsung);
719 return sprintf(buf, "%d\n", ret);
722 static ssize_t set_battery_life_extender(struct device *dev,
723 struct device_attribute *attr,
724 const char *buf, size_t count)
726 struct samsung_laptop *samsung = dev_get_drvdata(dev);
729 if (!count || sscanf(buf, "%i", &value) != 1)
732 ret = write_battery_life_extender(samsung, !!value);
739 static DEVICE_ATTR(battery_life_extender, S_IWUSR | S_IRUGO,
740 get_battery_life_extender, set_battery_life_extender);
742 static int read_usb_charge(struct samsung_laptop *samsung)
744 const struct sabi_commands *commands = &samsung->config->commands;
745 struct sabi_data data;
748 if (commands->get_usb_charge == 0xFFFF)
751 memset(&data, 0, sizeof(data));
753 retval = sabi_command(samsung, commands->get_usb_charge,
759 if (data.data[0] != 0 && data.data[0] != 1)
765 static int write_usb_charge(struct samsung_laptop *samsung,
768 const struct sabi_commands *commands = &samsung->config->commands;
769 struct sabi_data data;
771 memset(&data, 0, sizeof(data));
772 data.data[0] = 0x80 | enabled;
773 return sabi_command(samsung, commands->set_usb_charge,
777 static ssize_t get_usb_charge(struct device *dev,
778 struct device_attribute *attr,
781 struct samsung_laptop *samsung = dev_get_drvdata(dev);
784 ret = read_usb_charge(samsung);
788 return sprintf(buf, "%d\n", ret);
791 static ssize_t set_usb_charge(struct device *dev,
792 struct device_attribute *attr,
793 const char *buf, size_t count)
795 struct samsung_laptop *samsung = dev_get_drvdata(dev);
798 if (!count || sscanf(buf, "%i", &value) != 1)
801 ret = write_usb_charge(samsung, !!value);
808 static DEVICE_ATTR(usb_charge, S_IWUSR | S_IRUGO,
809 get_usb_charge, set_usb_charge);
811 static struct attribute *platform_attributes[] = {
812 &dev_attr_performance_level.attr,
813 &dev_attr_battery_life_extender.attr,
814 &dev_attr_usb_charge.attr,
818 static int find_signature(void __iomem *memcheck, const char *testStr)
823 for (loca = 0; loca < 0xffff; loca++) {
824 char temp = readb(memcheck + loca);
826 if (temp == testStr[i]) {
827 if (i == strlen(testStr)-1)
837 static void samsung_rfkill_exit(struct samsung_laptop *samsung)
839 if (samsung->wlan.rfkill) {
840 rfkill_unregister(samsung->wlan.rfkill);
841 rfkill_destroy(samsung->wlan.rfkill);
842 samsung->wlan.rfkill = NULL;
844 if (samsung->bluetooth.rfkill) {
845 rfkill_unregister(samsung->bluetooth.rfkill);
846 rfkill_destroy(samsung->bluetooth.rfkill);
847 samsung->bluetooth.rfkill = NULL;
851 static int samsung_new_rfkill(struct samsung_laptop *samsung,
852 struct samsung_rfkill *arfkill,
853 const char *name, enum rfkill_type type,
854 const struct rfkill_ops *ops,
857 struct rfkill **rfkill = &arfkill->rfkill;
860 arfkill->type = type;
861 arfkill->samsung = samsung;
863 *rfkill = rfkill_alloc(name, &samsung->platform_device->dev,
870 rfkill_init_sw_state(*rfkill, blocked);
872 ret = rfkill_register(*rfkill);
874 rfkill_destroy(*rfkill);
881 static int __init samsung_rfkill_init_seclinux(struct samsung_laptop *samsung)
883 return samsung_new_rfkill(samsung, &samsung->wlan, "samsung-wlan",
884 RFKILL_TYPE_WLAN, &seclinux_rfkill_ops, -1);
887 static int __init samsung_rfkill_init_swsmi(struct samsung_laptop *samsung)
889 struct sabi_data data;
892 ret = swsmi_wireless_status(samsung, &data);
894 /* Some swsmi laptops use the old seclinux way to control
895 * wireless devices */
897 ret = samsung_rfkill_init_seclinux(samsung);
901 /* 0x02 seems to mean that the device is no present/available */
903 if (data.data[WL_STATUS_WLAN] != 0x02)
904 ret = samsung_new_rfkill(samsung, &samsung->wlan,
908 !data.data[WL_STATUS_WLAN]);
912 if (data.data[WL_STATUS_BT] != 0x02)
913 ret = samsung_new_rfkill(samsung, &samsung->bluetooth,
915 RFKILL_TYPE_BLUETOOTH,
917 !data.data[WL_STATUS_BT]);
923 samsung_rfkill_exit(samsung);
928 static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
930 if (samsung->config->sabi_version == 2)
931 return samsung_rfkill_init_seclinux(samsung);
932 if (samsung->config->sabi_version == 3)
933 return samsung_rfkill_init_swsmi(samsung);
937 static int kbd_backlight_enable(struct samsung_laptop *samsung)
939 const struct sabi_commands *commands = &samsung->config->commands;
940 struct sabi_data data;
943 if (commands->kbd_backlight == 0xFFFF)
946 memset(&data, 0, sizeof(data));
948 retval = sabi_command(samsung, commands->kbd_backlight,
954 if (data.d0 != 0xccdd)
959 static int kbd_backlight_read(struct samsung_laptop *samsung)
961 const struct sabi_commands *commands = &samsung->config->commands;
962 struct sabi_data data;
965 memset(&data, 0, sizeof(data));
967 retval = sabi_command(samsung, commands->kbd_backlight,
976 static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
978 const struct sabi_commands *commands = &samsung->config->commands;
979 struct sabi_data data;
981 memset(&data, 0, sizeof(data));
982 data.d0 = 0x82 | ((brightness & 0xFF) << 8);
983 return sabi_command(samsung, commands->kbd_backlight,
987 static void kbd_led_update(struct work_struct *work)
989 struct samsung_laptop *samsung;
991 samsung = container_of(work, struct samsung_laptop, kbd_led_work);
992 kbd_backlight_write(samsung, samsung->kbd_led_wk);
995 static void kbd_led_set(struct led_classdev *led_cdev,
996 enum led_brightness value)
998 struct samsung_laptop *samsung;
1000 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1002 if (value > samsung->kbd_led.max_brightness)
1003 value = samsung->kbd_led.max_brightness;
1007 samsung->kbd_led_wk = value;
1008 queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
1011 static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
1013 struct samsung_laptop *samsung;
1015 samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
1016 return kbd_backlight_read(samsung);
1019 static void samsung_leds_exit(struct samsung_laptop *samsung)
1021 if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
1022 led_classdev_unregister(&samsung->kbd_led);
1023 if (samsung->led_workqueue)
1024 destroy_workqueue(samsung->led_workqueue);
1027 static int __init samsung_leds_init(struct samsung_laptop *samsung)
1031 samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
1032 if (!samsung->led_workqueue)
1035 if (kbd_backlight_enable(samsung) >= 0) {
1036 INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
1038 samsung->kbd_led.name = "samsung::kbd_backlight";
1039 samsung->kbd_led.brightness_set = kbd_led_set;
1040 samsung->kbd_led.brightness_get = kbd_led_get;
1041 samsung->kbd_led.max_brightness = 8;
1043 ret = led_classdev_register(&samsung->platform_device->dev,
1048 samsung_leds_exit(samsung);
1053 static void samsung_backlight_exit(struct samsung_laptop *samsung)
1055 if (samsung->backlight_device) {
1056 backlight_device_unregister(samsung->backlight_device);
1057 samsung->backlight_device = NULL;
1061 static int __init samsung_backlight_init(struct samsung_laptop *samsung)
1063 struct backlight_device *bd;
1064 struct backlight_properties props;
1066 if (!samsung->handle_backlight)
1069 memset(&props, 0, sizeof(struct backlight_properties));
1070 props.type = BACKLIGHT_PLATFORM;
1071 props.max_brightness = samsung->config->max_brightness -
1072 samsung->config->min_brightness;
1074 bd = backlight_device_register("samsung",
1075 &samsung->platform_device->dev,
1076 samsung, &backlight_ops,
1081 samsung->backlight_device = bd;
1082 samsung->backlight_device->props.brightness = read_brightness(samsung);
1083 samsung->backlight_device->props.power = FB_BLANK_UNBLANK;
1084 backlight_update_status(samsung->backlight_device);
1089 static mode_t samsung_sysfs_is_visible(struct kobject *kobj,
1090 struct attribute *attr, int idx)
1092 struct device *dev = container_of(kobj, struct device, kobj);
1093 struct platform_device *pdev = to_platform_device(dev);
1094 struct samsung_laptop *samsung = platform_get_drvdata(pdev);
1097 if (attr == &dev_attr_performance_level.attr)
1098 ok = !!samsung->config->performance_levels[0].name;
1099 if (attr == &dev_attr_battery_life_extender.attr)
1100 ok = !!(read_battery_life_extender(samsung) >= 0);
1101 if (attr == &dev_attr_usb_charge.attr)
1102 ok = !!(read_usb_charge(samsung) >= 0);
1104 return ok ? attr->mode : 0;
1107 static struct attribute_group platform_attribute_group = {
1108 .is_visible = samsung_sysfs_is_visible,
1109 .attrs = platform_attributes
1112 static void samsung_sysfs_exit(struct samsung_laptop *samsung)
1114 struct platform_device *device = samsung->platform_device;
1116 sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1119 static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
1121 struct platform_device *device = samsung->platform_device;
1123 return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1127 static int show_call(struct seq_file *m, void *data)
1129 struct samsung_laptop *samsung = m->private;
1130 struct sabi_data *sdata = &samsung->debug.data;
1133 seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1134 samsung->debug.command,
1135 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1137 ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
1140 seq_printf(m, "SABI command 0x%04x failed\n",
1141 samsung->debug.command);
1145 seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
1146 sdata->d0, sdata->d1, sdata->d2, sdata->d3);
1150 static int samsung_debugfs_open(struct inode *inode, struct file *file)
1152 return single_open(file, show_call, inode->i_private);
1155 static const struct file_operations samsung_laptop_call_io_ops = {
1156 .owner = THIS_MODULE,
1157 .open = samsung_debugfs_open,
1159 .llseek = seq_lseek,
1160 .release = single_release,
1163 static void samsung_debugfs_exit(struct samsung_laptop *samsung)
1165 debugfs_remove_recursive(samsung->debug.root);
1168 static int samsung_debugfs_init(struct samsung_laptop *samsung)
1170 struct dentry *dent;
1172 samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
1173 if (!samsung->debug.root) {
1174 pr_err("failed to create debugfs directory");
1178 samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
1179 samsung->debug.f0000_wrapper.size = 0xffff;
1181 samsung->debug.data_wrapper.data = &samsung->debug.data;
1182 samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
1184 samsung->debug.sdiag_wrapper.data = samsung->sdiag;
1185 samsung->debug.sdiag_wrapper.size = strlen(samsung->sdiag);
1187 dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
1188 samsung->debug.root, &samsung->debug.command);
1192 dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
1193 &samsung->debug.data.d0);
1197 dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
1198 &samsung->debug.data.d1);
1202 dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
1203 &samsung->debug.data.d2);
1207 dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
1208 &samsung->debug.data.d3);
1212 dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
1213 samsung->debug.root,
1214 &samsung->debug.data_wrapper);
1218 dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
1219 samsung->debug.root,
1220 &samsung->debug.f0000_wrapper);
1224 dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
1225 samsung->debug.root, samsung,
1226 &samsung_laptop_call_io_ops);
1230 dent = debugfs_create_blob("sdiag", S_IRUGO | S_IWUSR,
1231 samsung->debug.root,
1232 &samsung->debug.sdiag_wrapper);
1239 samsung_debugfs_exit(samsung);
1243 static void samsung_sabi_exit(struct samsung_laptop *samsung)
1245 const struct sabi_config *config = samsung->config;
1247 /* Turn off "Linux" mode in the BIOS */
1248 if (config && config->commands.set_linux != 0xff)
1249 sabi_set_commandb(samsung, config->commands.set_linux, 0x80);
1251 if (samsung->sabi_iface) {
1252 iounmap(samsung->sabi_iface);
1253 samsung->sabi_iface = NULL;
1255 if (samsung->f0000_segment) {
1256 iounmap(samsung->f0000_segment);
1257 samsung->f0000_segment = NULL;
1260 samsung->config = NULL;
1263 static __init void samsung_sabi_infos(struct samsung_laptop *samsung, int loca,
1264 unsigned int ifaceP)
1266 const struct sabi_config *config = samsung->config;
1268 printk(KERN_DEBUG "This computer supports SABI==%x\n",
1269 loca + 0xf0000 - 6);
1271 printk(KERN_DEBUG "SABI header:\n");
1272 printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
1273 readw(samsung->sabi + config->header_offsets.port));
1274 printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
1275 readb(samsung->sabi + config->header_offsets.iface_func));
1276 printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
1277 readb(samsung->sabi + config->header_offsets.en_mem));
1278 printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
1279 readb(samsung->sabi + config->header_offsets.re_mem));
1280 printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
1281 readw(samsung->sabi + config->header_offsets.data_offset));
1282 printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
1283 readw(samsung->sabi + config->header_offsets.data_segment));
1285 printk(KERN_DEBUG " SABI pointer = 0x%08x\n", ifaceP);
1288 static void __init samsung_sabi_diag(struct samsung_laptop *samsung)
1290 int loca = find_signature(samsung->f0000_segment, "SDiaG@");
1297 * Ident: @SDiaG@686XX-N90X3A/966-SEC-07HL-S90X3A
1299 * Product name: 90X3A
1300 * BIOS Version: 07HL
1303 for (i = 0; loca < 0xffff && i < sizeof(samsung->sdiag) - 1; loca++) {
1304 char temp = readb(samsung->f0000_segment + loca);
1306 if (isalnum(temp) || temp == '/' || temp == '-')
1307 samsung->sdiag[i++] = temp;
1312 if (debug && samsung->sdiag[0])
1313 pr_info("sdiag: %s", samsung->sdiag);
1316 static int __init samsung_sabi_init(struct samsung_laptop *samsung)
1318 const struct sabi_config *config = NULL;
1319 const struct sabi_commands *commands;
1320 unsigned int ifaceP;
1325 samsung->f0000_segment = ioremap_nocache(0xf0000, 0xffff);
1326 if (!samsung->f0000_segment) {
1328 pr_err("Can't map the segment at 0xf0000\n");
1333 samsung_sabi_diag(samsung);
1335 /* Try to find one of the signatures in memory to find the header */
1336 for (i = 0; sabi_configs[i].test_string != 0; ++i) {
1337 samsung->config = &sabi_configs[i];
1338 loca = find_signature(samsung->f0000_segment,
1339 samsung->config->test_string);
1344 if (loca == 0xffff) {
1346 pr_err("This computer does not support SABI\n");
1351 config = samsung->config;
1352 commands = &config->commands;
1354 /* point to the SMI port Number */
1356 samsung->sabi = (samsung->f0000_segment + loca);
1358 /* Get a pointer to the SABI Interface */
1359 ifaceP = (readw(samsung->sabi + config->header_offsets.data_segment) & 0x0ffff) << 4;
1360 ifaceP += readw(samsung->sabi + config->header_offsets.data_offset) & 0x0ffff;
1363 samsung_sabi_infos(samsung, loca, ifaceP);
1365 samsung->sabi_iface = ioremap_nocache(ifaceP, 16);
1366 if (!samsung->sabi_iface) {
1367 pr_err("Can't remap %x\n", ifaceP);
1372 /* Turn on "Linux" mode in the BIOS */
1373 if (commands->set_linux != 0xff) {
1374 int retval = sabi_set_commandb(samsung,
1375 commands->set_linux, 0x81);
1377 pr_warn("Linux mode was not set!\n");
1383 /* Check for stepping quirk */
1384 if (samsung->handle_backlight)
1385 check_for_stepping_quirk(samsung);
1387 pr_info("detected SABI interface: %s\n",
1388 samsung->config->test_string);
1392 samsung_sabi_exit(samsung);
1397 static void samsung_platform_exit(struct samsung_laptop *samsung)
1399 if (samsung->platform_device) {
1400 platform_device_unregister(samsung->platform_device);
1401 samsung->platform_device = NULL;
1405 static int __init samsung_platform_init(struct samsung_laptop *samsung)
1407 struct platform_device *pdev;
1409 pdev = platform_device_register_simple("samsung", -1, NULL, 0);
1411 return PTR_ERR(pdev);
1413 samsung->platform_device = pdev;
1414 platform_set_drvdata(samsung->platform_device, samsung);
1418 static struct dmi_system_id __initdata samsung_dmi_table[] = {
1421 DMI_MATCH(DMI_SYS_VENDOR,
1422 "SAMSUNG ELECTRONICS CO., LTD."),
1423 DMI_MATCH(DMI_CHASSIS_TYPE, "8"), /* Portable */
1428 DMI_MATCH(DMI_SYS_VENDOR,
1429 "SAMSUNG ELECTRONICS CO., LTD."),
1430 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /* Laptop */
1435 DMI_MATCH(DMI_SYS_VENDOR,
1436 "SAMSUNG ELECTRONICS CO., LTD."),
1437 DMI_MATCH(DMI_CHASSIS_TYPE, "10"), /* Notebook */
1442 DMI_MATCH(DMI_SYS_VENDOR,
1443 "SAMSUNG ELECTRONICS CO., LTD."),
1444 DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
1449 MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
1451 static struct platform_device *samsung_platform_device;
1453 static int __init samsung_init(void)
1455 struct samsung_laptop *samsung;
1458 if (!force && !dmi_check_system(samsung_dmi_table))
1461 samsung = kzalloc(sizeof(*samsung), GFP_KERNEL);
1465 mutex_init(&samsung->sabi_mutex);
1466 samsung->handle_backlight = true;
1469 /* Don't handle backlight here if the acpi video already handle it */
1470 if (acpi_video_backlight_support())
1471 samsung->handle_backlight = false;
1473 ret = samsung_platform_init(samsung);
1475 goto error_platform;
1477 ret = samsung_sabi_init(samsung);
1482 /* Only log that if we are really on a sabi platform */
1483 if (acpi_video_backlight_support())
1484 pr_info("Backlight controlled by ACPI video driver\n");
1487 ret = samsung_sysfs_init(samsung);
1491 ret = samsung_backlight_init(samsung);
1493 goto error_backlight;
1495 ret = samsung_rfkill_init(samsung);
1499 ret = samsung_leds_init(samsung);
1503 ret = samsung_debugfs_init(samsung);
1507 samsung_platform_device = samsung->platform_device;
1511 samsung_leds_exit(samsung);
1513 samsung_rfkill_exit(samsung);
1515 samsung_backlight_exit(samsung);
1517 samsung_sysfs_exit(samsung);
1519 samsung_sabi_exit(samsung);
1521 samsung_platform_exit(samsung);
1527 static void __exit samsung_exit(void)
1529 struct samsung_laptop *samsung;
1531 samsung = platform_get_drvdata(samsung_platform_device);
1533 samsung_debugfs_exit(samsung);
1534 samsung_leds_exit(samsung);
1535 samsung_rfkill_exit(samsung);
1536 samsung_backlight_exit(samsung);
1537 samsung_sysfs_exit(samsung);
1538 samsung_sabi_exit(samsung);
1539 samsung_platform_exit(samsung);
1542 samsung_platform_device = NULL;
1545 module_init(samsung_init);
1546 module_exit(samsung_exit);
1548 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
1549 MODULE_DESCRIPTION("Samsung Backlight driver");
1550 MODULE_LICENSE("GPL");