mirror of https://gitee.com/openkylin/linux.git
187 lines
3.7 KiB
C
187 lines
3.7 KiB
C
/*
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* LEDs driver for PCEngines ALIX.2 and ALIX.3
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*
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* Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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static int force = 0;
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module_param(force, bool, 0444);
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MODULE_PARM_DESC(force, "Assume system has ALIX.2/ALIX.3 style LEDs");
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struct alix_led {
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struct led_classdev cdev;
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unsigned short port;
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unsigned int on_value;
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unsigned int off_value;
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};
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static void alix_led_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct alix_led *led_dev =
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container_of(led_cdev, struct alix_led, cdev);
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if (brightness)
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outl(led_dev->on_value, led_dev->port);
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else
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outl(led_dev->off_value, led_dev->port);
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}
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static struct alix_led alix_leds[] = {
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{
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.cdev = {
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.name = "alix:1",
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.brightness_set = alix_led_set,
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},
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.port = 0x6100,
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.on_value = 1 << 22,
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.off_value = 1 << 6,
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},
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{
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.cdev = {
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.name = "alix:2",
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.brightness_set = alix_led_set,
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},
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.port = 0x6180,
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.on_value = 1 << 25,
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.off_value = 1 << 9,
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},
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{
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.cdev = {
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.name = "alix:3",
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.brightness_set = alix_led_set,
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},
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.port = 0x6180,
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.on_value = 1 << 27,
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.off_value = 1 << 11,
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},
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};
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static int __init alix_led_probe(struct platform_device *pdev)
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{
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int i;
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int ret;
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for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
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alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME;
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ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
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if (ret < 0)
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goto fail;
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}
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return 0;
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fail:
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while (--i >= 0)
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led_classdev_unregister(&alix_leds[i].cdev);
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return ret;
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}
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static int alix_led_remove(struct platform_device *pdev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
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led_classdev_unregister(&alix_leds[i].cdev);
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return 0;
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}
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static struct platform_driver alix_led_driver = {
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.remove = alix_led_remove,
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.driver = {
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.name = KBUILD_MODNAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init alix_present(void)
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{
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const unsigned long bios_phys = 0x000f0000;
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const size_t bios_len = 0x00010000;
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const char alix_sig[] = "PC Engines ALIX.";
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const size_t alix_sig_len = sizeof(alix_sig) - 1;
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const char *bios_virt;
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const char *scan_end;
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const char *p;
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int ret = 0;
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if (force) {
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printk(KERN_NOTICE "%s: forced to skip BIOS test, "
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"assume system has ALIX.2 style LEDs\n",
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KBUILD_MODNAME);
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ret = 1;
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goto out;
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}
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bios_virt = phys_to_virt(bios_phys);
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scan_end = bios_virt + bios_len - (alix_sig_len + 2);
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for (p = bios_virt; p < scan_end; p++) {
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const char *tail;
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if (memcmp(p, alix_sig, alix_sig_len) != 0) {
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continue;
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}
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tail = p + alix_sig_len;
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if ((tail[0] == '2' || tail[0] == '3') && tail[1] == '\0') {
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printk(KERN_INFO
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"%s: system is recognized as \"%s\"\n",
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KBUILD_MODNAME, p);
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ret = 1;
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break;
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}
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}
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out:
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return ret;
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}
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static struct platform_device *pdev;
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static int __init alix_led_init(void)
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{
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int ret;
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if (!alix_present()) {
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ret = -ENODEV;
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goto out;
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}
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/* enable output on GPIO for LED 1,2,3 */
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outl(1 << 6, 0x6104);
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outl(1 << 9, 0x6184);
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outl(1 << 11, 0x6184);
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pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
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if (!IS_ERR(pdev)) {
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ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
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if (ret)
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platform_device_unregister(pdev);
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} else
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ret = PTR_ERR(pdev);
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out:
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return ret;
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}
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static void __exit alix_led_exit(void)
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{
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platform_device_unregister(pdev);
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platform_driver_unregister(&alix_led_driver);
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}
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module_init(alix_led_init);
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module_exit(alix_led_exit);
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MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>");
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MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver");
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MODULE_LICENSE("GPL");
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