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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | /* * Driver for Samsung Q10 and related laptops: controls the backlight * * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com> * * 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/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/backlight.h> #include <linux/i8042.h> #include <linux/dmi.h> #define SAMSUNGQ10_BL_MAX_INTENSITY 255 #define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185 #define SAMSUNGQ10_BL_8042_CMD 0xbe #define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 } static int samsungq10_bl_brightness; static bool force; module_param(force, bool, 0); MODULE_PARM_DESC(force, "Disable the DMI check and force the driver to be loaded"); static int samsungq10_bl_set_intensity(struct backlight_device *bd) { int brightness = bd->props.brightness; unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA; c[2] = (unsigned char)brightness; i8042_lock_chip(); i8042_command(c, (0x30 << 8) | SAMSUNGQ10_BL_8042_CMD); i8042_unlock_chip(); samsungq10_bl_brightness = brightness; return 0; } static int samsungq10_bl_get_intensity(struct backlight_device *bd) { return samsungq10_bl_brightness; } static const struct backlight_ops samsungq10_bl_ops = { .get_brightness = samsungq10_bl_get_intensity, .update_status = samsungq10_bl_set_intensity, }; #ifdef CONFIG_PM_SLEEP static int samsungq10_suspend(struct device *dev) { return 0; } static int samsungq10_resume(struct device *dev) { struct backlight_device *bd = dev_get_drvdata(dev); samsungq10_bl_set_intensity(bd); return 0; } #else #define samsungq10_suspend NULL #define samsungq10_resume NULL #endif static SIMPLE_DEV_PM_OPS(samsungq10_pm_ops, samsungq10_suspend, samsungq10_resume); static int __devinit samsungq10_probe(struct platform_device *pdev) { struct backlight_properties props; struct backlight_device *bd; memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_PLATFORM; props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY; bd = backlight_device_register("samsung", &pdev->dev, NULL, &samsungq10_bl_ops, &props); if (IS_ERR(bd)) return PTR_ERR(bd); platform_set_drvdata(pdev, bd); bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; samsungq10_bl_set_intensity(bd); return 0; } static int __devexit samsungq10_remove(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; samsungq10_bl_set_intensity(bd); backlight_device_unregister(bd); return 0; } static struct platform_driver samsungq10_driver = { .driver = { .name = KBUILD_MODNAME, .owner = THIS_MODULE, .pm = &samsungq10_pm_ops, }, .probe = samsungq10_probe, .remove = __devexit_p(samsungq10_remove), }; static struct platform_device *samsungq10_device; static int __init dmi_check_callback(const struct dmi_system_id *id) { printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident); return 1; } static struct dmi_system_id __initdata samsungq10_dmi_table[] = { { .ident = "Samsung Q10", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Samsung"), DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"), }, .callback = dmi_check_callback, }, { .ident = "Samsung Q20", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"), }, .callback = dmi_check_callback, }, { .ident = "Samsung Q25", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"), }, .callback = dmi_check_callback, }, { .ident = "Dell Latitude X200", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), DMI_MATCH(DMI_PRODUCT_NAME, "X200"), }, .callback = dmi_check_callback, }, { }, }; MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table); static int __init samsungq10_init(void) { if (!force && !dmi_check_system(samsungq10_dmi_table)) return -ENODEV; samsungq10_device = platform_create_bundle(&samsungq10_driver, samsungq10_probe, NULL, 0, NULL, 0); if (IS_ERR(samsungq10_device)) return PTR_ERR(samsungq10_device); return 0; } static void __exit samsungq10_exit(void) { platform_device_unregister(samsungq10_device); platform_driver_unregister(&samsungq10_driver); } module_init(samsungq10_init); module_exit(samsungq10_exit); MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>"); MODULE_DESCRIPTION("Samsung Q10 Driver"); MODULE_LICENSE("GPL"); |