blob: fa262b6b25eb26dfab24fa784200ae6175996f06 [file] [log] [blame]
Linus Walleij4da498fc2014-07-23 05:36:00 -07001/*
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
Muhammad Falak R Wani95281b52015-09-07 21:58:29 +053019#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 */
Linus Walleij4da498fc2014-07-23 05:36:00 -070022
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;
Muhammad Falak R Wani95281b52015-09-07 21:58:29 +053082 if (*delay_on > IPAQ_LED_MAX_DUTY ||
Linus Walleij4da498fc2014-07-23 05:36:00 -070083 *delay_off > IPAQ_LED_MAX_DUTY)
Muhammad Falak R Wani95281b52015-09-07 21:58:29 +053084 return -EINVAL;
Linus Walleij4da498fc2014-07-23 05:36:00 -070085
Muhammad Falak R Wani95281b52015-09-07 21:58:29 +053086 if (*delay_on == 0 && *delay_off == 0) {
87 *delay_on = 100;
88 *delay_off = 100;
89 }
Linus Walleij4da498fc2014-07-23 05:36:00 -070090
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
Muhammad Falak R Wani431557f2015-09-07 19:43:23 +0530114 ret = devm_led_classdev_register(&pdev->dev, &micro_led);
Linus Walleij4da498fc2014-07-23 05:36:00 -0700115 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
Wei Yongjune661c892014-07-28 06:15:24 -0700124static struct platform_driver micro_leds_device_driver = {
Linus Walleij4da498fc2014-07-23 05:36:00 -0700125 .driver = {
126 .name = "ipaq-micro-leds",
127 },
128 .probe = micro_leds_probe,
Linus Walleij4da498fc2014-07-23 05:36:00 -0700129};
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");