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drivers/leds/leds-ipaq-micro.c
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4da498fc6 leds: add driver ... |
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/* * 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. * * h3xxx atmel micro companion support, notification LED subdevice * * Author : Linus Walleij <linus.walleij@linaro.org> */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/mfd/ipaq-micro.h> #include <linux/leds.h> #define LED_YELLOW 0x00 #define LED_GREEN 0x01 #define LED_EN (1 << 4) /* LED ON/OFF 0:off, 1:on */ #define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */ #define LED_ALWAYS (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask */ static void micro_leds_brightness_set(struct led_classdev *led_cdev, enum led_brightness value) { struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent); /* * In this message: * Byte 0 = LED color: 0 = yellow, 1 = green * yellow LED is always ~30 blinks per minute * Byte 1 = duration (flags?) appears to be ignored * Byte 2 = green ontime in 1/10 sec (deciseconds) * 1 = 1/10 second * 0 = 256/10 second * Byte 3 = green offtime in 1/10 sec (deciseconds) * 1 = 1/10 second * 0 = 256/10 seconds */ struct ipaq_micro_msg msg = { .id = MSG_NOTIFY_LED, .tx_len = 4, }; msg.tx_data[0] = LED_GREEN; msg.tx_data[1] = 0; if (value) { msg.tx_data[2] = 0; /* Duty cycle 256 */ msg.tx_data[3] = 1; } else { msg.tx_data[2] = 1; msg.tx_data[3] = 0; /* Duty cycle 256 */ } ipaq_micro_tx_msg_sync(micro, &msg); } /* Maximum duty cycle in ms 256/10 sec = 25600 ms */ #define IPAQ_LED_MAX_DUTY 25600 static int micro_leds_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off) { struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent); /* * In this message: * Byte 0 = LED color: 0 = yellow, 1 = green * yellow LED is always ~30 blinks per minute * Byte 1 = duration (flags?) appears to be ignored * Byte 2 = green ontime in 1/10 sec (deciseconds) * 1 = 1/10 second * 0 = 256/10 second * Byte 3 = green offtime in 1/10 sec (deciseconds) * 1 = 1/10 second * 0 = 256/10 seconds */ struct ipaq_micro_msg msg = { .id = MSG_NOTIFY_LED, .tx_len = 4, }; msg.tx_data[0] = LED_GREEN; if (*delay_on > IPAQ_LED_MAX_DUTY || *delay_off > IPAQ_LED_MAX_DUTY) return -EINVAL; if (*delay_on == 0 && *delay_off == 0) { *delay_on = 100; *delay_off = 100; } msg.tx_data[1] = 0; if (*delay_on >= IPAQ_LED_MAX_DUTY) msg.tx_data[2] = 0; else msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100); if (*delay_off >= IPAQ_LED_MAX_DUTY) msg.tx_data[3] = 0; else msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100); return ipaq_micro_tx_msg_sync(micro, &msg); } static struct led_classdev micro_led = { .name = "led-ipaq-micro", .brightness_set = micro_leds_brightness_set, .blink_set = micro_leds_blink_set, .flags = LED_CORE_SUSPENDRESUME, }; static int micro_leds_probe(struct platform_device *pdev) { int ret; ret = led_classdev_register(&pdev->dev, µ_led); if (ret) { dev_err(&pdev->dev, "registering led failed: %d ", ret); return ret; } dev_info(&pdev->dev, "iPAQ micro notification LED driver "); return 0; } static int micro_leds_remove(struct platform_device *pdev) { led_classdev_unregister(µ_led); return 0; } |
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static struct platform_driver micro_leds_device_driver = { |
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.driver = { .name = "ipaq-micro-leds", }, .probe = micro_leds_probe, .remove = micro_leds_remove, }; module_platform_driver(micro_leds_device_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds"); MODULE_ALIAS("platform:ipaq-micro-leds"); |