/* * 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. * * iPAQ microcontroller backlight support * Author : Linus Walleij <linus.walleij@linaro.org> */ #include <linux/backlight.h> #include <linux/err.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/mfd/ipaq-micro.h> #include <linux/module.h> #include <linux/platform_device.h> static int micro_bl_update_status(struct backlight_device *bd) { struct ipaq_micro *micro = dev_get_drvdata(&bd->dev); int intensity = bd->props.brightness; struct ipaq_micro_msg msg = { .id = MSG_BACKLIGHT, .tx_len = 3, }; if (bd->props.power != FB_BLANK_UNBLANK) intensity = 0; if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED)) intensity = 0; /* * Message format: * Byte 0: backlight instance (usually 1) * Byte 1: on/off * Byte 2: intensity, 0-255 */ msg.tx_data[0] = 0x01; msg.tx_data[1] = intensity > 0 ? 1 : 0; msg.tx_data[2] = intensity; return ipaq_micro_tx_msg_sync(micro, &msg); } static const struct backlight_ops micro_bl_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = micro_bl_update_status, }; static struct backlight_properties micro_bl_props = { .type = BACKLIGHT_RAW, .max_brightness = 255, .power = FB_BLANK_UNBLANK, .brightness = 64, }; static int micro_backlight_probe(struct platform_device *pdev) { struct backlight_device *bd; struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent); bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight", &pdev->dev, micro, µ_bl_ops, µ_bl_props); if (IS_ERR(bd)) return PTR_ERR(bd); platform_set_drvdata(pdev, bd); backlight_update_status(bd); return 0; } static struct platform_driver micro_backlight_device_driver = { .driver = { .name = "ipaq-micro-backlight", }, .probe = micro_backlight_probe, }; module_platform_driver(micro_backlight_device_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight"); MODULE_ALIAS("platform:ipaq-micro-backlight");