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 void 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	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		= 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");
135