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/*
* ThingM blink(1) USB RGB LED driver
*
* Copyright 2013 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*/
#include <linux/hid.h>
#include <linux/leds.h>
#include <linux/module.h>
#include "hid-ids.h"
#define BLINK1_CMD_SIZE 9
#define blink1_rgb_to_r(rgb) ((rgb & 0xFF0000) >> 16)
#define blink1_rgb_to_g(rgb) ((rgb & 0x00FF00) >> 8)
#define blink1_rgb_to_b(rgb) ((rgb & 0x0000FF) >> 0)
/**
* struct blink1_data - blink(1) device specific data
* @hdev: HID device.
* @led_cdev: LED class instance.
* @rgb: 8-bit per channel RGB notation.
* @brightness: brightness coefficient.
*/
struct blink1_data {
struct hid_device *hdev;
struct led_classdev led_cdev;
u32 rgb;
u8 brightness;
};
static int blink1_send_command(struct blink1_data *data,
u8 buf[BLINK1_CMD_SIZE])
{
int ret;
hid_dbg(data->hdev, "command: %d%c%.2x%.2x%.2x%.2x%.2x%.2x%.2x\n",
buf[0], buf[1], buf[2], buf[3], buf[4],
buf[5], buf[6], buf[7], buf[8]);
ret = hid_hw_raw_request(data->hdev, buf[0], buf, BLINK1_CMD_SIZE,
HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
return ret < 0 ? ret : 0;
}
static int blink1_update_color(struct blink1_data *data)
{
u8 buf[BLINK1_CMD_SIZE] = { 1, 'n', 0, 0, 0, 0, 0, 0, 0 };
if (data->brightness) {
unsigned int coef = DIV_ROUND_CLOSEST(255, data->brightness);
buf[2] = DIV_ROUND_CLOSEST(blink1_rgb_to_r(data->rgb), coef);
buf[3] = DIV_ROUND_CLOSEST(blink1_rgb_to_g(data->rgb), coef);
buf[4] = DIV_ROUND_CLOSEST(blink1_rgb_to_b(data->rgb), coef);
}
return blink1_send_command(data, buf);
}
static void blink1_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
data->brightness = brightness;
if (blink1_update_color(data))
hid_err(data->hdev, "failed to update color\n");
}
static enum led_brightness blink1_led_get(struct led_classdev *led_cdev)
{
struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
return data->brightness;
}
static ssize_t blink1_show_rgb(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
return sprintf(buf, "%.6X\n", data->rgb);
}
static ssize_t blink1_store_rgb(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct blink1_data *data = dev_get_drvdata(dev->parent);
long unsigned int rgb;
int ret;
ret = kstrtoul(buf, 16, &rgb);
if (ret)
return ret;
/* RGB triplet notation is 24-bit hexadecimal */
if (rgb > 0xFFFFFF)
return -EINVAL;
data->rgb = rgb;
ret = blink1_update_color(data);
return ret ? ret : count;
}
static DEVICE_ATTR(rgb, S_IRUGO | S_IWUSR, blink1_show_rgb, blink1_store_rgb);
static const struct attribute_group blink1_sysfs_group = {
.attrs = (struct attribute *[]) {
&dev_attr_rgb.attr,
NULL
},
};
static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct blink1_data *data;
struct led_classdev *led;
char led_name[13];
int ret;
data = devm_kzalloc(&hdev->dev, sizeof(struct blink1_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
hid_set_drvdata(hdev, data);
data->hdev = hdev;
data->rgb = 0xFFFFFF; /* set a default white color */
ret = hid_parse(hdev);
if (ret)
goto error;
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret)
goto error;
/* blink(1) serial numbers range is 0x1A001000 to 0x1A002FFF */
led = &data->led_cdev;
snprintf(led_name, sizeof(led_name), "blink1::%s", hdev->uniq + 4);
led->name = led_name;
led->brightness_set = blink1_led_set;
led->brightness_get = blink1_led_get;
ret = led_classdev_register(&hdev->dev, led);
if (ret)
goto stop;
ret = sysfs_create_group(&led->dev->kobj, &blink1_sysfs_group);
if (ret)
goto remove_led;
return 0;
remove_led:
led_classdev_unregister(led);
stop:
hid_hw_stop(hdev);
error:
return ret;
}
static void thingm_remove(struct hid_device *hdev)
{
struct blink1_data *data = hid_get_drvdata(hdev);
struct led_classdev *led = &data->led_cdev;
sysfs_remove_group(&led->dev->kobj, &blink1_sysfs_group);
led_classdev_unregister(led);
hid_hw_stop(hdev);
}
static const struct hid_device_id thingm_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_THINGM, USB_DEVICE_ID_BLINK1) },
{ }
};
MODULE_DEVICE_TABLE(hid, thingm_table);
static struct hid_driver thingm_driver = {
.name = "thingm",
.probe = thingm_probe,
.remove = thingm_remove,
.id_table = thingm_table,
};
module_hid_driver(thingm_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vivien Didelot <vivien.didelot@savoirfairelinux.com>");
MODULE_DESCRIPTION("ThingM blink(1) USB RGB LED driver");
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