drivers/leds/leds-ipaq-micro.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *
0004  * h3xxx atmel micro companion support, notification LED subdevice
0005  *
0006  * Author : Linus Walleij <linus.walleij@linaro.org>
0007  */
0008
0009 #include <linux/module.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/mfd/ipaq-micro.h>
0012 #include <linux/leds.h>
0013
0014 #define LED_YELLOW  0x00
0015 #define LED_GREEN   0x01
0016
0017 #define LED_EN       (1 << 4) /* LED ON/OFF 0:off, 1:on                       */
0018 #define LED_AUTOSTOP (1 << 5) /* LED ON/OFF auto stop set 0:disable, 1:enable */
0019 #define LED_ALWAYS   (1 << 6) /* LED Interrupt Mask 0:No mask, 1:mask         */
0020
0021 static int micro_leds_brightness_set(struct led_classdev *led_cdev,
0022                       enum led_brightness value)
0023 {
0024     struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
0025     /*
0026      * In this message:
0027      * Byte 0 = LED color: 0 = yellow, 1 = green
0028      *          yellow LED is always ~30 blinks per minute
0029      * Byte 1 = duration (flags?) appears to be ignored
0030      * Byte 2 = green ontime in 1/10 sec (deciseconds)
0031      *          1 = 1/10 second
0032      *          0 = 256/10 second
0033      * Byte 3 = green offtime in 1/10 sec (deciseconds)
0034      *          1 = 1/10 second
0035      *          0 = 256/10 seconds
0036      */
0037     struct ipaq_micro_msg msg = {
0038         .id = MSG_NOTIFY_LED,
0039         .tx_len = 4,
0040     };
0041
0042     msg.tx_data[0] = LED_GREEN;
0043     msg.tx_data[1] = 0;
0044     if (value) {
0045         msg.tx_data[2] = 0; /* Duty cycle 256 */
0046         msg.tx_data[3] = 1;
0047     } else {
0048         msg.tx_data[2] = 1;
0049         msg.tx_data[3] = 0; /* Duty cycle 256 */
0050     }
0051     return ipaq_micro_tx_msg_sync(micro, &msg);
0052 }
0053
0054 /* Maximum duty cycle in ms 256/10 sec = 25600 ms */
0055 #define IPAQ_LED_MAX_DUTY 25600
0056
0057 static int micro_leds_blink_set(struct led_classdev *led_cdev,
0058                 unsigned long *delay_on,
0059                 unsigned long *delay_off)
0060 {
0061     struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
0062     /*
0063      * In this message:
0064      * Byte 0 = LED color: 0 = yellow, 1 = green
0065      *          yellow LED is always ~30 blinks per minute
0066      * Byte 1 = duration (flags?) appears to be ignored
0067      * Byte 2 = green ontime in 1/10 sec (deciseconds)
0068      *          1 = 1/10 second
0069      *          0 = 256/10 second
0070      * Byte 3 = green offtime in 1/10 sec (deciseconds)
0071      *          1 = 1/10 second
0072      *          0 = 256/10 seconds
0073      */
0074     struct ipaq_micro_msg msg = {
0075         .id = MSG_NOTIFY_LED,
0076         .tx_len = 4,
0077     };
0078
0079     msg.tx_data[0] = LED_GREEN;
0080     if (*delay_on > IPAQ_LED_MAX_DUTY ||
0081         *delay_off > IPAQ_LED_MAX_DUTY)
0082         return -EINVAL;
0083
0084     if (*delay_on == 0 && *delay_off == 0) {
0085         *delay_on = 100;
0086         *delay_off = 100;
0087     }
0088
0089     msg.tx_data[1] = 0;
0090     if (*delay_on >= IPAQ_LED_MAX_DUTY)
0091         msg.tx_data[2] = 0;
0092     else
0093         msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
0094     if (*delay_off >= IPAQ_LED_MAX_DUTY)
0095         msg.tx_data[3] = 0;
0096     else
0097         msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
0098     return ipaq_micro_tx_msg_sync(micro, &msg);
0099 }
0100
0101 static struct led_classdev micro_led = {
0102     .name           = "led-ipaq-micro",
0103     .brightness_set_blocking = micro_leds_brightness_set,
0104     .blink_set      = micro_leds_blink_set,
0105     .flags          = LED_CORE_SUSPENDRESUME,
0106 };
0107
0108 static int micro_leds_probe(struct platform_device *pdev)
0109 {
0110     int ret;
0111
0112     ret = devm_led_classdev_register(&pdev->dev, &micro_led);
0113     if (ret) {
0114         dev_err(&pdev->dev, "registering led failed: %d\n", ret);
0115         return ret;
0116     }
0117     dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
0118
0119     return 0;
0120 }
0121
0122 static struct platform_driver micro_leds_device_driver = {
0123     .driver = {
0124         .name    = "ipaq-micro-leds",
0125     },
0126     .probe   = micro_leds_probe,
0127 };
0128 module_platform_driver(micro_leds_device_driver);
0129
0130 MODULE_LICENSE("GPL");
0131 MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
0132 MODULE_ALIAS("platform:ipaq-micro-leds");