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 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 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 }; 109 110 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