1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * h3xxx atmel micro companion support, notification LED subdevice
5 *
6 * Author : Linus Walleij <linus.walleij@linaro.org>
7 */
8
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/mfd/ipaq-micro.h>
12#include <linux/leds.h>
13
14#define LED_YELLOW	0x00
15#define LED_GREEN	0x01
16
17#define LED_EN       (1 << 4) /* LED ON/OFF 0:off, 1:on                       */
18#define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */
19#define LED_ALWAYS   (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask         */
20
21static int micro_leds_brightness_set(struct led_classdev *led_cdev,
22				      enum led_brightness value)
23{
24	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
25	/*
26	 * In this message:
27	 * Byte 0 = LED color: 0 = yellow, 1 = green
28	 *          yellow LED is always ~30 blinks per minute
29	 * Byte 1 = duration (flags?) appears to be ignored
30	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
31	 *          1 = 1/10 second
32	 *          0 = 256/10 second
33	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
34	 *          1 = 1/10 second
35	 *          0 = 256/10 seconds
36	 */
37	struct ipaq_micro_msg msg = {
38		.id = MSG_NOTIFY_LED,
39		.tx_len = 4,
40	};
41
42	msg.tx_data[0] = LED_GREEN;
43	msg.tx_data[1] = 0;
44	if (value) {
45		msg.tx_data[2] = 0; /* Duty cycle 256 */
46		msg.tx_data[3] = 1;
47	} else {
48		msg.tx_data[2] = 1;
49		msg.tx_data[3] = 0; /* Duty cycle 256 */
50	}
51	return ipaq_micro_tx_msg_sync(micro, &msg);
52}
53
54/* Maximum duty cycle in ms 256/10 sec = 25600 ms */
55#define IPAQ_LED_MAX_DUTY 25600
56
57static int micro_leds_blink_set(struct led_classdev *led_cdev,
58				unsigned long *delay_on,
59				unsigned long *delay_off)
60{
61	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
62	/*
63	 * In this message:
64	 * Byte 0 = LED color: 0 = yellow, 1 = green
65	 *          yellow LED is always ~30 blinks per minute
66	 * Byte 1 = duration (flags?) appears to be ignored
67	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
68	 *          1 = 1/10 second
69	 *          0 = 256/10 second
70	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
71	 *          1 = 1/10 second
72	 *          0 = 256/10 seconds
73	 */
74	struct ipaq_micro_msg msg = {
75		.id = MSG_NOTIFY_LED,
76		.tx_len = 4,
77	};
78
79	msg.tx_data[0] = LED_GREEN;
80	if (*delay_on > IPAQ_LED_MAX_DUTY ||
81	    *delay_off > IPAQ_LED_MAX_DUTY)
82		return -EINVAL;
83
84	if (*delay_on == 0 && *delay_off == 0) {
85		*delay_on = 100;
86		*delay_off = 100;
87	}
88
89	msg.tx_data[1] = 0;
90	if (*delay_on >= IPAQ_LED_MAX_DUTY)
91		msg.tx_data[2] = 0;
92	else
93		msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
94	if (*delay_off >= IPAQ_LED_MAX_DUTY)
95		msg.tx_data[3] = 0;
96	else
97		msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
98	return ipaq_micro_tx_msg_sync(micro, &msg);
99}
100
101static struct led_classdev micro_led = {
102	.name			= "led-ipaq-micro",
103	.brightness_set_blocking = micro_leds_brightness_set,
104	.blink_set		= micro_leds_blink_set,
105	.flags			= LED_CORE_SUSPENDRESUME,
106};
107
108static int micro_leds_probe(struct platform_device *pdev)
109{
110	int ret;
111
112	ret = devm_led_classdev_register(&pdev->dev, &micro_led);
113	if (ret) {
114		dev_err(&pdev->dev, "registering led failed: %d\n", ret);
115		return ret;
116	}
117	dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
118
119	return 0;
120}
121
122static struct platform_driver micro_leds_device_driver = {
123	.driver = {
124		.name    = "ipaq-micro-leds",
125	},
126	.probe   = micro_leds_probe,
127};
128module_platform_driver(micro_leds_device_driver);
129
130MODULE_LICENSE("GPL");
131MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
132MODULE_ALIAS("platform:ipaq-micro-leds");
133