--- /dev/null
+/*
+ * Samsung N130 Laptop driver
+ *
+ * Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de)
+ * Copyright (C) 2009 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ */
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/dmi.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+
+/*
+ * This driver is needed because a number of Samsung laptops do not hook
+ * their control settings through ACPI. So we have to poke around in the
+ * BIOS to do things like brightness values, and "special" key controls.
+ */
+
+/*
+ * We have 0 - 8 as valid brightness levels. The specs say that level 0 should
+ * be reserved by the BIOS (which really doesn't make much sense), we tell
+ * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
+ */
+#define MAX_BRIGHT 0x07
+
+/* Brightness is 0 - 8, as described above. Value 0 is for the BIOS to use */
+#define GET_BRIGHTNESS 0x00
+#define SET_BRIGHTNESS 0x01
+
+/* first byte:
+ * 0x00 - wireless is off
+ * 0x01 - wireless is on
+ * second byte:
+ * 0x02 - 3G is off
+ * 0x03 - 3G is on
+ * TODO, verify 3G is correct, that doesn't seem right...
+ */
+#define GET_WIRELESS_BUTTON 0x02
+#define SET_WIRELESS_BUTTON 0x03
+
+/* 0 is off, 1 is on */
+#define GET_BACKLIGHT 0x04
+#define SET_BACKLIGHT 0x05
+
+/*
+ * 0x80 or 0x00 - no action
+ * 0x81 - recovery key pressed
+ */
+#define GET_RECOVERY_METHOD 0x06
+#define SET_RECOVERY_METHOD 0x07
+
+/* 0 is low, 1 is high */
+#define GET_PERFORMANCE_LEVEL 0x08
+#define SET_PERFORMANCE_LEVEL 0x09
+
+/*
+ * Tell the BIOS that Linux is running on this machine.
+ * 81 is on, 80 is off
+ */
+#define SET_LINUX 0x0a
+
+
+#define MAIN_FUNCTION 0x4c49
+
+#define SABI_HEADER_PORT 0x00
+#define SABI_HEADER_RE_MEM 0x02
+#define SABI_HEADER_IFACEFUNC 0x03
+#define SABI_HEADER_EN_MEM 0x04
+#define SABI_HEADER_DATA_OFFSET 0x05
+#define SABI_HEADER_DATA_SEGMENT 0x07
+
+#define SABI_IFACE_MAIN 0x00
+#define SABI_IFACE_SUB 0x02
+#define SABI_IFACE_COMPLETE 0x04
+#define SABI_IFACE_DATA 0x05
+
+/* Structure to get data back to the calling function */
+struct sabi_retval {
+ u8 retval[20];
+};
+
+static void __iomem *sabi;
+static void __iomem *sabi_iface;
+static void __iomem *f0000_segment;
+static struct backlight_device *backlight_device;
+static struct mutex sabi_mutex;
+static struct platform_device *sdev;
+static struct rfkill *rfk;
+
+static int force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Disable the DMI check and forces the driver to be loaded");
+
+static int debug;
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+static int sabi_get_command(u8 command, struct sabi_retval *sretval)
+{
+ int retval = 0;
+ u16 port = readw(sabi + SABI_HEADER_PORT);
+
+ mutex_lock(&sabi_mutex);
+
+ /* enable memory to be able to write to it */
+ outb(readb(sabi + SABI_HEADER_EN_MEM), port);
+
+ /* write out the command */
+ writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
+ writew(command, sabi_iface + SABI_IFACE_SUB);
+ writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
+ outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
+
+ /* write protect memory to make it safe */
+ outb(readb(sabi + SABI_HEADER_RE_MEM), port);
+
+ /* see if the command actually succeeded */
+ if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
+ readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
+ /*
+ * It did!
+ * Save off the data into a structure so the caller use it.
+ * Right now we only care about the first 4 bytes,
+ * I suppose there are commands that need more, but I don't
+ * know about them.
+ */
+ sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
+ sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
+ sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
+ sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
+ goto exit;
+ }
+
+ /* Something bad happened, so report it and error out */
+ printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
+ command, readb(sabi_iface + SABI_IFACE_COMPLETE),
+ readb(sabi_iface + SABI_IFACE_DATA));
+ retval = -EINVAL;
+exit:
+ mutex_unlock(&sabi_mutex);
+ return retval;
+
+}
+
+static int sabi_set_command(u8 command, u8 data)
+{
+ int retval = 0;
+ u16 port = readw(sabi + SABI_HEADER_PORT);
+
+ mutex_lock(&sabi_mutex);
+
+ /* enable memory to be able to write to it */
+ outb(readb(sabi + SABI_HEADER_EN_MEM), port);
+
+ /* write out the command */
+ writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
+ writew(command, sabi_iface + SABI_IFACE_SUB);
+ writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
+ writeb(data, sabi_iface + SABI_IFACE_DATA);
+ outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
+
+ /* write protect memory to make it safe */
+ outb(readb(sabi + SABI_HEADER_RE_MEM), port);
+
+ /* see if the command actually succeeded */
+ if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
+ readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
+ /* it did! */
+ goto exit;
+ }
+
+ /* Something bad happened, so report it and error out */
+ printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
+ command, readb(sabi_iface + SABI_IFACE_COMPLETE),
+ readb(sabi_iface + SABI_IFACE_DATA));
+ retval = -EINVAL;
+exit:
+ mutex_unlock(&sabi_mutex);
+ return retval;
+}
+
+static void test_backlight(void)
+{
+ struct sabi_retval sretval;
+
+ sabi_get_command(GET_BACKLIGHT, &sretval);
+ printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+
+ sabi_set_command(SET_BACKLIGHT, 0);
+ printk(KERN_DEBUG "backlight should be off\n");
+
+ sabi_get_command(GET_BACKLIGHT, &sretval);
+ printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+
+ msleep(1000);
+
+ sabi_set_command(SET_BACKLIGHT, 1);
+ printk(KERN_DEBUG "backlight should be on\n");
+
+ sabi_get_command(GET_BACKLIGHT, &sretval);
+ printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+}
+
+static void test_wireless(void)
+{
+ struct sabi_retval sretval;
+
+ sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+ printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+
+ sabi_set_command(SET_WIRELESS_BUTTON, 0);
+ printk(KERN_DEBUG "wireless led should be off\n");
+
+ sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+ printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+
+ msleep(1000);
+
+ sabi_set_command(SET_WIRELESS_BUTTON, 1);
+ printk(KERN_DEBUG "wireless led should be on\n");
+
+ sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+ printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+}
+
+static u8 read_brightness(void)
+{
+ struct sabi_retval sretval;
+ int user_brightness = 0;
+ int retval;
+
+ retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
+ if (!retval)
+ user_brightness = sretval.retval[0];
+ if (user_brightness != 0)
+ --user_brightness;
+ return user_brightness;
+}
+
+static void set_brightness(u8 user_brightness)
+{
+ sabi_set_command(SET_BRIGHTNESS, user_brightness + 1);
+}
+
+static int get_brightness(struct backlight_device *bd)
+{
+ return (int)read_brightness();
+}
+
+static int update_status(struct backlight_device *bd)
+{
+ set_brightness(bd->props.brightness);
+
+ if (bd->props.power == FB_BLANK_UNBLANK)
+ sabi_set_command(SET_BACKLIGHT, 1);
+ else
+ sabi_set_command(SET_BACKLIGHT, 0);
+ return 0;
+}
+
+static struct backlight_ops backlight_ops = {
+ .get_brightness = get_brightness,
+ .update_status = update_status,
+};
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
+static int rfkill_set(void *data, bool blocked)
+{
+ /* Do something with blocked...*/
+ /*
+ * blocked == false is on
+ * blocked == true is off
+ */
+ if (blocked)
+ sabi_set_command(SET_WIRELESS_BUTTON, 0);
+ else
+ sabi_set_command(SET_WIRELESS_BUTTON, 1);
+
+ return 0;
+}
+
+static struct rfkill_ops rfkill_ops = {
+ .set_block = rfkill_set,
+};
+
+static int init_wireless(struct platform_device *sdev)
+{
+ int retval;
+
+ rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
+ &rfkill_ops, NULL);
+ if (!rfk)
+ return -ENOMEM;
+
+ retval = rfkill_register(rfk);
+ if (retval) {
+ rfkill_destroy(rfk);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void destroy_wireless(void)
+{
+ rfkill_unregister(rfk);
+ rfkill_destroy(rfk);
+}
+
+#else
+
+static int rfkill_set(void *data, enum rfkill_state state)
+{
+ if (state == RFKILL_STATE_UNBLOCKED)
+ sabi_set_command(SET_WIRELESS_BUTTON, 1);
+ else
+ sabi_set_command(SET_WIRELESS_BUTTON, 0);
+
+ return 0;
+}
+
+static int init_wireless(struct platform_device *sdev)
+{
+ int retval;
+
+ rfk = rfkill_allocate(&sdev->dev, RFKILL_TYPE_WLAN);
+ if (!rfk)
+ return -ENOMEM;
+ rfk->toggle_radio = rfkill_set;
+ rfk->name = "samsung-wifi";
+
+ retval = rfkill_register(rfk);
+ if (retval) {
+ rfkill_free(rfk);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void destroy_wireless(void)
+{
+ rfkill_unregister(rfk);
+}
+
+#endif
+
+static ssize_t get_silent_state(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct sabi_retval sretval;
+ int retval;
+
+ /* Read the state */
+ retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval);
+ if (retval)
+ return retval;
+
+ /* The logic is backwards, yeah, lots of fun... */
+ if (sretval.retval[0] == 0)
+ retval = 1;
+ else
+ retval = 0;
+ return sprintf(buf, "%d\n", retval);
+}
+
+static ssize_t set_silent_state(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ char value;
+
+ if (count >= 1) {
+ value = buf[0];
+ if ((value == '0') || (value == 'n') || (value == 'N')) {
+ /* Turn speed up */
+ sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01);
+ } else if ((value == '1') || (value == 'y') || (value == 'Y')) {
+ /* Turn speed down */
+ sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00);
+ } else {
+ return -EINVAL;
+ }
+ }
+ return count;
+}
+static DEVICE_ATTR(silent, S_IWUGO | S_IRUGO,
+ get_silent_state, set_silent_state);
+
+
+static int __init dmi_check_cb(const struct dmi_system_id *id)
+{
+ printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n",
+ id->ident);
+ return 0;
+}
+
+static struct dmi_system_id __initdata samsung_dmi_table[] = {
+ {
+ .ident = "N128",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
+ DMI_MATCH(DMI_BOARD_NAME, "N128"),
+ },
+ .callback = dmi_check_cb,
+ },
+ {
+ .ident = "N130",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
+ DMI_MATCH(DMI_BOARD_NAME, "N130"),
+ },
+ .callback = dmi_check_cb,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
+
+static int __init samsung_init(void)
+{
+ struct sabi_retval sretval;
+ const char *testStr = "SECLINUX";
+ void __iomem *memcheck;
+ unsigned int ifaceP;
+ int pStr;
+ int loca;
+ int retval;
+
+ mutex_init(&sabi_mutex);
+
+ if (!force && !dmi_check_system(samsung_dmi_table))
+ return -ENODEV;
+
+ f0000_segment = ioremap(0xf0000, 0xffff);
+ if (!f0000_segment) {
+ printk(KERN_ERR "Can't map the segment at 0xf0000\n");
+ return -EINVAL;
+ }
+
+ /* Try to find the signature "SECLINUX" in memory to find the header */
+ pStr = 0;
+ memcheck = f0000_segment;
+ for (loca = 0; loca < 0xffff; loca++) {
+ char temp = readb(memcheck + loca);
+
+ if (temp == testStr[pStr]) {
+ if (pStr == strlen(testStr)-1)
+ break;
+ ++pStr;
+ } else {
+ pStr = 0;
+ }
+ }
+ if (loca == 0xffff) {
+ printk(KERN_ERR "This computer does not support SABI\n");
+ goto error_no_signature;
+ }
+
+ /* point to the SMI port Number */
+ loca += 1;
+ sabi = (memcheck + loca);
+
+ if (debug) {
+ printk(KERN_DEBUG "This computer supports SABI==%x\n",
+ loca + 0xf0000 - 6);
+ printk(KERN_DEBUG "SABI header:\n");
+ printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
+ readw(sabi + SABI_HEADER_PORT));
+ printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
+ readb(sabi + SABI_HEADER_IFACEFUNC));
+ printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
+ readb(sabi + SABI_HEADER_EN_MEM));
+ printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
+ readb(sabi + SABI_HEADER_RE_MEM));
+ printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
+ readw(sabi + SABI_HEADER_DATA_OFFSET));
+ printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
+ readw(sabi + SABI_HEADER_DATA_SEGMENT));
+ }
+
+ /* Get a pointer to the SABI Interface */
+ ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4;
+ ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff;
+ sabi_iface = ioremap(ifaceP, 16);
+ if (!sabi_iface) {
+ printk(KERN_ERR "Can't remap %x\n", ifaceP);
+ goto exit;
+ }
+ if (debug) {
+ printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
+ printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
+
+ test_backlight();
+ test_wireless();
+
+ retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
+ printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
+ }
+
+ /* Turn on "Linux" mode in the BIOS */
+ retval = sabi_set_command(SET_LINUX, 0x81);
+ if (retval) {
+ printk(KERN_ERR KBUILD_MODNAME ": Linux mode was not set!\n");
+ goto error_no_platform;
+ }
+
+ /* knock up a platform device to hang stuff off of */
+ sdev = platform_device_register_simple("samsung", -1, NULL, 0);
+ if (IS_ERR(sdev))
+ goto error_no_platform;
+
+ /* create a backlight device to talk to this one */
+ backlight_device = backlight_device_register("samsung", &sdev->dev,
+ NULL, &backlight_ops);
+ if (IS_ERR(backlight_device))
+ goto error_no_backlight;
+
+ backlight_device->props.max_brightness = MAX_BRIGHT;
+ backlight_device->props.brightness = read_brightness();
+ backlight_device->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(backlight_device);
+
+ retval = init_wireless(sdev);
+ if (retval)
+ goto error_no_rfk;
+
+ retval = device_create_file(&sdev->dev, &dev_attr_silent);
+ if (retval)
+ goto error_file_create;
+
+exit:
+ return 0;
+
+error_file_create:
+ destroy_wireless();
+
+error_no_rfk:
+ backlight_device_unregister(backlight_device);
+
+error_no_backlight:
+ platform_device_unregister(sdev);
+
+error_no_platform:
+ iounmap(sabi_iface);
+
+error_no_signature:
+ iounmap(f0000_segment);
+ return -EINVAL;
+}
+
+static void __exit samsung_exit(void)
+{
+ /* Turn off "Linux" mode in the BIOS */
+ sabi_set_command(SET_LINUX, 0x80);
+
+ device_remove_file(&sdev->dev, &dev_attr_silent);
+ backlight_device_unregister(backlight_device);
+ destroy_wireless();
+ iounmap(sabi_iface);
+ iounmap(f0000_segment);
+ platform_device_unregister(sdev);
+}
+
+module_init(samsung_init);
+module_exit(samsung_exit);
+
+MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
+MODULE_DESCRIPTION("Samsung Backlight driver");
+MODULE_LICENSE("GPL");
projects / karo-tx-linux.git / commitdiff