272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*
|
|
* 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.
|
|
* @fade: fade time in hundredths of a second.
|
|
* @brightness: brightness coefficient.
|
|
* @play: play/pause in-memory patterns.
|
|
*/
|
|
struct blink1_data {
|
|
struct hid_device *hdev;
|
|
struct led_classdev led_cdev;
|
|
u32 rgb;
|
|
u16 fade;
|
|
u8 brightness;
|
|
bool play;
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
if (data->fade) {
|
|
buf[1] = 'c';
|
|
buf[5] = (data->fade & 0xFF00) >> 8;
|
|
buf[6] = (data->fade & 0x00FF);
|
|
}
|
|
|
|
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 ssize_t blink1_show_fade(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct blink1_data *data = dev_get_drvdata(dev->parent);
|
|
|
|
return sprintf(buf, "%d\n", data->fade * 10);
|
|
}
|
|
|
|
static ssize_t blink1_store_fade(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 fade;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &fade);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* blink(1) accepts 16-bit fade time, number of 10ms ticks */
|
|
fade = DIV_ROUND_CLOSEST(fade, 10);
|
|
if (fade > 65535)
|
|
return -EINVAL;
|
|
|
|
data->fade = fade;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(fade, S_IRUGO | S_IWUSR,
|
|
blink1_show_fade, blink1_store_fade);
|
|
|
|
static ssize_t blink1_show_play(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct blink1_data *data = dev_get_drvdata(dev->parent);
|
|
|
|
return sprintf(buf, "%d\n", data->play);
|
|
}
|
|
|
|
static ssize_t blink1_store_play(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct blink1_data *data = dev_get_drvdata(dev->parent);
|
|
u8 cmd[BLINK1_CMD_SIZE] = { 1, 'p', 0, 0, 0, 0, 0, 0, 0 };
|
|
long unsigned int play;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &play);
|
|
if (ret)
|
|
return ret;
|
|
|
|
data->play = !!play;
|
|
cmd[2] = data->play;
|
|
ret = blink1_send_command(data, cmd);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static DEVICE_ATTR(play, S_IRUGO | S_IWUSR,
|
|
blink1_show_play, blink1_store_play);
|
|
|
|
static const struct attribute_group blink1_sysfs_group = {
|
|
.attrs = (struct attribute *[]) {
|
|
&dev_attr_rgb.attr,
|
|
&dev_attr_fade.attr,
|
|
&dev_attr_play.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");
|