Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Backlight Driver for the KB3886 Backlight |
| 3 | * |
| 4 | * Copyright (c) 2007-2008 Claudio Nieder |
| 5 | * |
| 6 | * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/platform_device.h> |
| 18 | #include <linux/mutex.h> |
| 19 | #include <linux/fb.h> |
| 20 | #include <linux/backlight.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/dmi.h> |
| 23 | |
| 24 | #define KB3886_PARENT 0x64 |
| 25 | #define KB3886_IO 0x60 |
| 26 | #define KB3886_ADC_DAC_PWM 0xC4 |
| 27 | #define KB3886_PWM0_WRITE 0x81 |
| 28 | #define KB3886_PWM0_READ 0x41 |
| 29 | |
| 30 | static DEFINE_MUTEX(bl_mutex); |
| 31 | |
| 32 | static void kb3886_bl_set_intensity(int intensity) |
| 33 | { |
| 34 | mutex_lock(&bl_mutex); |
| 35 | intensity = intensity&0xff; |
| 36 | outb(KB3886_ADC_DAC_PWM, KB3886_PARENT); |
| 37 | msleep(10); |
| 38 | outb(KB3886_PWM0_WRITE, KB3886_IO); |
| 39 | msleep(10); |
| 40 | outb(intensity, KB3886_IO); |
| 41 | mutex_unlock(&bl_mutex); |
| 42 | } |
| 43 | |
| 44 | struct kb3886bl_machinfo { |
| 45 | int max_intensity; |
| 46 | int default_intensity; |
| 47 | int limit_mask; |
| 48 | void (*set_bl_intensity)(int intensity); |
| 49 | }; |
| 50 | |
| 51 | static struct kb3886bl_machinfo kb3886_bl_machinfo = { |
| 52 | .max_intensity = 0xff, |
| 53 | .default_intensity = 0xa0, |
| 54 | .limit_mask = 0x7f, |
| 55 | .set_bl_intensity = kb3886_bl_set_intensity, |
| 56 | }; |
| 57 | |
| 58 | static struct platform_device kb3886bl_device = { |
| 59 | .name = "kb3886-bl", |
| 60 | .dev = { |
| 61 | .platform_data = &kb3886_bl_machinfo, |
| 62 | }, |
| 63 | .id = -1, |
| 64 | }; |
| 65 | |
| 66 | static struct platform_device *devices[] __initdata = { |
| 67 | &kb3886bl_device, |
| 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Back to driver |
| 72 | */ |
| 73 | |
| 74 | static int kb3886bl_intensity; |
| 75 | static struct backlight_device *kb3886_backlight_device; |
| 76 | static struct kb3886bl_machinfo *bl_machinfo; |
| 77 | |
| 78 | static unsigned long kb3886bl_flags; |
| 79 | #define KB3886BL_SUSPENDED 0x01 |
| 80 | |
| 81 | static struct dmi_system_id __initdata kb3886bl_device_table[] = { |
| 82 | { |
| 83 | .ident = "Sahara Touch-iT", |
| 84 | .matches = { |
| 85 | DMI_MATCH(DMI_SYS_VENDOR, "SDV"), |
| 86 | DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"), |
| 87 | }, |
| 88 | }, |
| 89 | { } |
| 90 | }; |
| 91 | |
| 92 | static int kb3886bl_send_intensity(struct backlight_device *bd) |
| 93 | { |
| 94 | int intensity = bd->props.brightness; |
| 95 | |
| 96 | if (bd->props.power != FB_BLANK_UNBLANK) |
| 97 | intensity = 0; |
| 98 | if (bd->props.fb_blank != FB_BLANK_UNBLANK) |
| 99 | intensity = 0; |
| 100 | if (kb3886bl_flags & KB3886BL_SUSPENDED) |
| 101 | intensity = 0; |
| 102 | |
| 103 | bl_machinfo->set_bl_intensity(intensity); |
| 104 | |
| 105 | kb3886bl_intensity = intensity; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | #ifdef CONFIG_PM |
| 110 | static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state) |
| 111 | { |
| 112 | struct backlight_device *bd = platform_get_drvdata(pdev); |
| 113 | |
| 114 | kb3886bl_flags |= KB3886BL_SUSPENDED; |
| 115 | backlight_update_status(bd); |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | static int kb3886bl_resume(struct platform_device *pdev) |
| 120 | { |
| 121 | struct backlight_device *bd = platform_get_drvdata(pdev); |
| 122 | |
| 123 | kb3886bl_flags &= ~KB3886BL_SUSPENDED; |
| 124 | backlight_update_status(bd); |
| 125 | return 0; |
| 126 | } |
| 127 | #else |
| 128 | #define kb3886bl_suspend NULL |
| 129 | #define kb3886bl_resume NULL |
| 130 | #endif |
| 131 | |
| 132 | static int kb3886bl_get_intensity(struct backlight_device *bd) |
| 133 | { |
| 134 | return kb3886bl_intensity; |
| 135 | } |
| 136 | |
Emese Revfy | 9905a43 | 2009-12-14 00:58:57 +0100 | [diff] [blame] | 137 | static const struct backlight_ops kb3886bl_ops = { |
Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 138 | .get_brightness = kb3886bl_get_intensity, |
| 139 | .update_status = kb3886bl_send_intensity, |
| 140 | }; |
| 141 | |
| 142 | static int kb3886bl_probe(struct platform_device *pdev) |
| 143 | { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 144 | struct backlight_properties props; |
Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 145 | struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data; |
| 146 | |
| 147 | bl_machinfo = machinfo; |
| 148 | if (!machinfo->limit_mask) |
| 149 | machinfo->limit_mask = -1; |
| 150 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 151 | memset(&props, 0, sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 152 | props.type = BACKLIGHT_RAW; |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 153 | props.max_brightness = machinfo->max_intensity; |
Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 154 | kb3886_backlight_device = backlight_device_register("kb3886-bl", |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 155 | &pdev->dev, NULL, |
| 156 | &kb3886bl_ops, |
| 157 | &props); |
Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 158 | if (IS_ERR(kb3886_backlight_device)) |
| 159 | return PTR_ERR(kb3886_backlight_device); |
| 160 | |
| 161 | platform_set_drvdata(pdev, kb3886_backlight_device); |
| 162 | |
Claudio Nieder | d03ebb1 | 2008-10-20 23:35:40 +0100 | [diff] [blame] | 163 | kb3886_backlight_device->props.power = FB_BLANK_UNBLANK; |
| 164 | kb3886_backlight_device->props.brightness = machinfo->default_intensity; |
| 165 | backlight_update_status(kb3886_backlight_device); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static int kb3886bl_remove(struct platform_device *pdev) |
| 171 | { |
| 172 | struct backlight_device *bd = platform_get_drvdata(pdev); |
| 173 | |
| 174 | backlight_device_unregister(bd); |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static struct platform_driver kb3886bl_driver = { |
| 180 | .probe = kb3886bl_probe, |
| 181 | .remove = kb3886bl_remove, |
| 182 | .suspend = kb3886bl_suspend, |
| 183 | .resume = kb3886bl_resume, |
| 184 | .driver = { |
| 185 | .name = "kb3886-bl", |
| 186 | }, |
| 187 | }; |
| 188 | |
| 189 | static int __init kb3886_init(void) |
| 190 | { |
| 191 | if (!dmi_check_system(kb3886bl_device_table)) |
| 192 | return -ENODEV; |
| 193 | |
| 194 | platform_add_devices(devices, ARRAY_SIZE(devices)); |
| 195 | return platform_driver_register(&kb3886bl_driver); |
| 196 | } |
| 197 | |
| 198 | static void __exit kb3886_exit(void) |
| 199 | { |
| 200 | platform_driver_unregister(&kb3886bl_driver); |
| 201 | } |
| 202 | |
| 203 | module_init(kb3886_init); |
| 204 | module_exit(kb3886_exit); |
| 205 | |
| 206 | MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>"); |
| 207 | MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver"); |
| 208 | MODULE_LICENSE("GPL"); |
| 209 | MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*"); |