drivers/leds/leds-ipaq-micro.c

   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 int 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         return 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_blocking = 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, &micro_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");