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
micro_leds_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)21 static 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
micro_leds_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)57 static 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
101 static 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
micro_leds_probe(struct platform_device * pdev)108 static int micro_leds_probe(struct platform_device *pdev)
109 {
110 int ret;
111
112 ret = devm_led_classdev_register(&pdev->dev, µ_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
122 static struct platform_driver micro_leds_device_driver = {
123 .driver = {
124 .name = "ipaq-micro-leds",
125 },
126 .probe = micro_leds_probe,
127 };
128 module_platform_driver(micro_leds_device_driver);
129
130 MODULE_LICENSE("GPL");
131 MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
132 MODULE_ALIAS("platform:ipaq-micro-leds");
133