135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* h3xxx atmel micro companion support, notification LED subdevice
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*
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* Author : Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/ipaq-micro.h>
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#include <linux/leds.h>
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#define LED_YELLOW 0x00
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#define LED_GREEN 0x01
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#define LED_EN (1 << 4) /* LED ON/OFF 0:off, 1:on */
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#define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */
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#define LED_ALWAYS (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask */
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static int micro_leds_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
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/*
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* In this message:
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* Byte 0 = LED color: 0 = yellow, 1 = green
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* yellow LED is always ~30 blinks per minute
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* Byte 1 = duration (flags?) appears to be ignored
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* Byte 2 = green ontime in 1/10 sec (deciseconds)
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* 1 = 1/10 second
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* 0 = 256/10 second
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* Byte 3 = green offtime in 1/10 sec (deciseconds)
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* 1 = 1/10 second
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* 0 = 256/10 seconds
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*/
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struct ipaq_micro_msg msg = {
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.id = MSG_NOTIFY_LED,
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.tx_len = 4,
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};
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msg.tx_data[0] = LED_GREEN;
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msg.tx_data[1] = 0;
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if (value) {
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msg.tx_data[2] = 0; /* Duty cycle 256 */
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msg.tx_data[3] = 1;
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} else {
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msg.tx_data[2] = 1;
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msg.tx_data[3] = 0; /* Duty cycle 256 */
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}
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return ipaq_micro_tx_msg_sync(micro, &msg);
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}
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/* Maximum duty cycle in ms 256/10 sec = 25600 ms */
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#define IPAQ_LED_MAX_DUTY 25600
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static int micro_leds_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
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/*
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* In this message:
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* Byte 0 = LED color: 0 = yellow, 1 = green
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* yellow LED is always ~30 blinks per minute
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* Byte 1 = duration (flags?) appears to be ignored
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* Byte 2 = green ontime in 1/10 sec (deciseconds)
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* 1 = 1/10 second
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* 0 = 256/10 second
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* Byte 3 = green offtime in 1/10 sec (deciseconds)
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* 1 = 1/10 second
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* 0 = 256/10 seconds
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*/
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struct ipaq_micro_msg msg = {
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.id = MSG_NOTIFY_LED,
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.tx_len = 4,
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};
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msg.tx_data[0] = LED_GREEN;
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if (*delay_on > IPAQ_LED_MAX_DUTY ||
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*delay_off > IPAQ_LED_MAX_DUTY)
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return -EINVAL;
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if (*delay_on == 0 && *delay_off == 0) {
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*delay_on = 100;
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*delay_off = 100;
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}
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msg.tx_data[1] = 0;
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if (*delay_on >= IPAQ_LED_MAX_DUTY)
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msg.tx_data[2] = 0;
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else
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msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
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if (*delay_off >= IPAQ_LED_MAX_DUTY)
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msg.tx_data[3] = 0;
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else
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msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
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return ipaq_micro_tx_msg_sync(micro, &msg);
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}
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static struct led_classdev micro_led = {
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.name = "led-ipaq-micro",
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.brightness_set_blocking = micro_leds_brightness_set,
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.blink_set = micro_leds_blink_set,
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.flags = LED_CORE_SUSPENDRESUME,
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};
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static int micro_leds_probe(struct platform_device *pdev)
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{
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int ret;
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ret = devm_led_classdev_register(&pdev->dev, µ_led);
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if (ret) {
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dev_err(&pdev->dev, "registering led failed: %d\n", ret);
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return ret;
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}
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dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
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return 0;
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}
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static struct platform_driver micro_leds_device_driver = {
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.driver = {
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.name = "ipaq-micro-leds",
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},
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.probe = micro_leds_probe,
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};
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module_platform_driver(micro_leds_device_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
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MODULE_ALIAS("platform:ipaq-micro-leds");
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