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81 lines
2.0 KiB
81 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* |
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* iPAQ microcontroller backlight support |
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* Author : Linus Walleij <[email protected]> |
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*/ |
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#include <linux/backlight.h> |
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#include <linux/err.h> |
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#include <linux/fb.h> |
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#include <linux/init.h> |
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#include <linux/mfd/ipaq-micro.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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static int micro_bl_update_status(struct backlight_device *bd) |
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{ |
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struct ipaq_micro *micro = dev_get_drvdata(&bd->dev); |
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int intensity = bd->props.brightness; |
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struct ipaq_micro_msg msg = { |
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.id = MSG_BACKLIGHT, |
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.tx_len = 3, |
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}; |
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if (bd->props.power != FB_BLANK_UNBLANK) |
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intensity = 0; |
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if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED)) |
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intensity = 0; |
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/* |
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* Message format: |
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* Byte 0: backlight instance (usually 1) |
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* Byte 1: on/off |
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* Byte 2: intensity, 0-255 |
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*/ |
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msg.tx_data[0] = 0x01; |
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msg.tx_data[1] = intensity > 0 ? 1 : 0; |
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msg.tx_data[2] = intensity; |
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return ipaq_micro_tx_msg_sync(micro, &msg); |
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} |
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static const struct backlight_ops micro_bl_ops = { |
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.options = BL_CORE_SUSPENDRESUME, |
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.update_status = micro_bl_update_status, |
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}; |
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static const struct backlight_properties micro_bl_props = { |
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.type = BACKLIGHT_RAW, |
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.max_brightness = 255, |
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.power = FB_BLANK_UNBLANK, |
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.brightness = 64, |
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}; |
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static int micro_backlight_probe(struct platform_device *pdev) |
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{ |
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struct backlight_device *bd; |
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struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent); |
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bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight", |
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&pdev->dev, micro, µ_bl_ops, |
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µ_bl_props); |
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if (IS_ERR(bd)) |
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return PTR_ERR(bd); |
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platform_set_drvdata(pdev, bd); |
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backlight_update_status(bd); |
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return 0; |
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} |
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static struct platform_driver micro_backlight_device_driver = { |
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.driver = { |
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.name = "ipaq-micro-backlight", |
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}, |
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.probe = micro_backlight_probe, |
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}; |
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module_platform_driver(micro_backlight_device_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight"); |
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MODULE_ALIAS("platform:ipaq-micro-backlight");
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