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
micro_leds_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)23 static 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
micro_leds_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)59 static 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
103 static 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
micro_leds_probe(struct platform_device * pdev)110 static int micro_leds_probe(struct platform_device *pdev)
111 {
112 int ret;
113
114 ret = devm_led_classdev_register(&pdev->dev, µ_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
124 static struct platform_driver micro_leds_device_driver = {
125 .driver = {
126 .name = "ipaq-micro-leds",
127 },
128 .probe = micro_leds_probe,
129 };
130 module_platform_driver(micro_leds_device_driver);
131
132 MODULE_LICENSE("GPL");
133 MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
134 MODULE_ALIAS("platform:ipaq-micro-leds");
135