linux/drivers/leds/leds-ipaq-micro.c
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   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
  21static 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
  57static 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
 101static 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
 108static int micro_leds_probe(struct platform_device *pdev)
 109{
 110        int ret;
 111
 112        ret = devm_led_classdev_register(&pdev->dev, &micro_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
 122static struct platform_driver micro_leds_device_driver = {
 123        .driver = {
 124                .name    = "ipaq-micro-leds",
 125        },
 126        .probe   = micro_leds_probe,
 127};
 128module_platform_driver(micro_leds_device_driver);
 129
 130MODULE_LICENSE("GPL");
 131MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
 132MODULE_ALIAS("platform:ipaq-micro-leds");
 133