projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2188a988 LW |
1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify | |
| 3 | * it under the terms of the GNU General Public License version 2 as | |
| 4 | * published by the Free Software Foundation. | |
| 5 | * | |
| 6 | * iPAQ microcontroller backlight support | |
| 7 | * Author : Linus Walleij <linus.walleij@linaro.org> | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/backlight.h> | |
| 11 | #include <linux/err.h> | |
| 12 | #include <linux/fb.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/mfd/ipaq-micro.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/platform_device.h> | |
| 17 | ||
| 18 | static int micro_bl_update_status(struct backlight_device *bd) | |
| 19 | { | |
| 20 | struct ipaq_micro *micro = dev_get_drvdata(&bd->dev); | |
| 21 | int intensity = bd->props.brightness; | |
| 22 | struct ipaq_micro_msg msg = { | |
| 23 | .id = MSG_BACKLIGHT, | |
| 24 | .tx_len = 3, | |
| 25 | }; | |
| 26 | ||
| 27 | if (bd->props.power != FB_BLANK_UNBLANK) | |
| 28 | intensity = 0; | |
| 29 | if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED)) | |
| 30 | intensity = 0; | |
| 31 | ||
| 32 | /* | |
| 33 | * Message format: | |
| 34 | * Byte 0: backlight instance (usually 1) | |
| 35 | * Byte 1: on/off | |
| 36 | * Byte 2: intensity, 0-255 | |
| 37 | */ | |
| 38 | msg.tx_data[0] = 0x01; | |
| 39 | msg.tx_data[1] = intensity > 0 ? 1 : 0; | |
| 40 | msg.tx_data[2] = intensity; | |
| 41 | return ipaq_micro_tx_msg_sync(micro, &msg); | |
| 42 | } | |
| 43 | ||
| 44 | static const struct backlight_ops micro_bl_ops = { | |
| 45 | .options = BL_CORE_SUSPENDRESUME, | |
| 46 | .update_status = micro_bl_update_status, | |
| 47 | }; | |
| 48 | ||
| 49 | static struct backlight_properties micro_bl_props = { | |
| 50 | .type = BACKLIGHT_RAW, | |
| 51 | .max_brightness = 255, | |
| 52 | .power = FB_BLANK_UNBLANK, | |
| 53 | .brightness = 64, | |
| 54 | }; | |
| 55 | ||
| 56 | static int micro_backlight_probe(struct platform_device *pdev) | |
| 57 | { | |
| 58 | struct backlight_device *bd; | |
| 59 | struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent); | |
| 60 | ||
| 61 | bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight", | |
| 62 | &pdev->dev, micro, µ_bl_ops, | |
| 63 | µ_bl_props); | |
| 64 | if (IS_ERR(bd)) | |
| 65 | return PTR_ERR(bd); | |
| 66 | ||
| 67 | platform_set_drvdata(pdev, bd); | |
| 68 | backlight_update_status(bd); | |
| 69 | ||
| 70 | return 0; | |
| 71 | } | |
| 72 | ||
| 87464cdb | 73 | static struct platform_driver micro_backlight_device_driver = { |
| 2188a988 LW |
74 | .driver = { |
| 75 | .name = "ipaq-micro-backlight", | |
| 76 | }, | |
| 77 | .probe = micro_backlight_probe, | |
| 78 | }; | |
| 79 | module_platform_driver(micro_backlight_device_driver); | |
| 80 | ||
| 81 | MODULE_LICENSE("GPL v2"); | |
| 82 | MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight"); | |
| 83 | MODULE_ALIAS("platform:ipaq-micro-backlight"); |