LXR linux/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
  23static 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
  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;
  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
 103static 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
 110static 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
 124static struct platform_driver micro_leds_device_driver = {
 125        .driver = {
 126                .name    = "ipaq-micro-leds",
 127        },
 128        .probe   = micro_leds_probe,
 129};
 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");
 135