1/*
  2 * This program is free software; you can redistribute it and/or modify
  3 * it under the terms of the GNU General Public License version 2 as
  4 * published by the Free Software Foundation.
  5 *
  6 * h3xxx atmel micro companion support, notification LED subdevice
  7 *
  8 * Author : Linus Walleij <linus.walleij@linaro.org>
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/platform_device.h>
 13#include <linux/mfd/ipaq-micro.h>
 14#include <linux/leds.h>
 15
 16#define LED_YELLOW	0x00
 17#define LED_GREEN	0x01
 18
 19#define LED_EN       (1 << 4) /* LED ON/OFF 0:off, 1:on                       */
 20#define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */
 21#define LED_ALWAYS   (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask         */
 22
 23static int micro_leds_brightness_set(struct led_classdev *led_cdev,
 24				      enum led_brightness value)
 25{
 26	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
 27	/*
 28	 * In this message:
 29	 * Byte 0 = LED color: 0 = yellow, 1 = green
 30	 *          yellow LED is always ~30 blinks per minute
 31	 * Byte 1 = duration (flags?) appears to be ignored
 32	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
 33	 *          1 = 1/10 second
 34	 *          0 = 256/10 second
 35	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
 36	 *          1 = 1/10 second
 37	 *          0 = 256/10 seconds
 38	 */
 39	struct ipaq_micro_msg msg = {
 40		.id = MSG_NOTIFY_LED,
 41		.tx_len = 4,
 42	};
 43
 44	msg.tx_data[0] = LED_GREEN;
 45	msg.tx_data[1] = 0;
 46	if (value) {
 47		msg.tx_data[2] = 0; /* Duty cycle 256 */
 48		msg.tx_data[3] = 1;
 49	} else {
 50		msg.tx_data[2] = 1;
 51		msg.tx_data[3] = 0; /* Duty cycle 256 */
 52	}
 53	return ipaq_micro_tx_msg_sync(micro, &msg);
 54}
 55
 56/* Maximum duty cycle in ms 256/10 sec = 25600 ms */
 57#define IPAQ_LED_MAX_DUTY 25600
 58
 59static int micro_leds_blink_set(struct led_classdev *led_cdev,
 60				unsigned long *delay_on,
 61				unsigned long *delay_off)
 62{
 63	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
 64	/*
 65	 * In this message:
 66	 * Byte 0 = LED color: 0 = yellow, 1 = green
 67	 *          yellow LED is always ~30 blinks per minute
 68	 * Byte 1 = duration (flags?) appears to be ignored
 69	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
 70	 *          1 = 1/10 second
 71	 *          0 = 256/10 second
 72	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
 73	 *          1 = 1/10 second
 74	 *          0 = 256/10 seconds
 75	 */
 76	struct ipaq_micro_msg msg = {
 77		.id = MSG_NOTIFY_LED,
 78		.tx_len = 4,
 79	};
 80
 81	msg.tx_data[0] = LED_GREEN;
 82	if (*delay_on > IPAQ_LED_MAX_DUTY ||
 83	    *delay_off > IPAQ_LED_MAX_DUTY)
 84		return -EINVAL;
 85
 86	if (*delay_on == 0 && *delay_off == 0) {
 87		*delay_on = 100;
 88		*delay_off = 100;
 89	}
 90
 91	msg.tx_data[1] = 0;
 92	if (*delay_on >= IPAQ_LED_MAX_DUTY)
 93		msg.tx_data[2] = 0;
 94	else
 95		msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
 96	if (*delay_off >= IPAQ_LED_MAX_DUTY)
 97		msg.tx_data[3] = 0;
 98	else
 99		msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
100	return ipaq_micro_tx_msg_sync(micro, &msg);
101}
102
103static struct led_classdev micro_led = {
104	.name			= "led-ipaq-micro",
105	.brightness_set_blocking = micro_leds_brightness_set,
106	.blink_set		= micro_leds_blink_set,
107	.flags			= LED_CORE_SUSPENDRESUME,
108};
109
110static int micro_leds_probe(struct platform_device *pdev)
111{
112	int ret;
113
114	ret = devm_led_classdev_register(&pdev->dev, &micro_led);
115	if (ret) {
116		dev_err(&pdev->dev, "registering led failed: %d\n", ret);
117		return ret;
118	}
119	dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
120
121	return 0;
122}
123
124static struct platform_driver micro_leds_device_driver = {
125	.driver = {
126		.name    = "ipaq-micro-leds",
127	},
128	.probe   = micro_leds_probe,
129};
130module_platform_driver(micro_leds_device_driver);
131
132MODULE_LICENSE("GPL");
133MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
134MODULE_ALIAS("platform:ipaq-micro-leds");