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/*
* Simple USB RGB LED driver
*
* Copyright 2016 Heiner Kallweit <hkallweit1@gmail.com>
* Based on drivers/hid/hid-thingm.c and
* drivers/usb/misc/usbled.c
*
* 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/hidraw.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include "hid-ids.h"
enum hidled_report_type {
RAW_REQUEST,
OUTPUT_REPORT
};
enum hidled_type {
RISO_KAGAKU,
DREAM_CHEEKY,
THINGM,
DELCOM,
LUXAFOR,
};
static unsigned const char riso_kagaku_tbl[] = {
/* R+2G+4B -> riso kagaku color index */
[0] = 0, /* black */
[1] = 2, /* red */
[2] = 1, /* green */
[3] = 5, /* yellow */
[4] = 3, /* blue */
[5] = 6, /* magenta */
[6] = 4, /* cyan */
[7] = 7 /* white */
};
#define RISO_KAGAKU_IX(r, g, b) riso_kagaku_tbl[((r)?1:0)+((g)?2:0)+((b)?4:0)]
union delcom_packet {
__u8 data[8];
struct {
__u8 major_cmd;
__u8 minor_cmd;
__u8 data_lsb;
__u8 data_msb;
} tx;
struct {
__u8 cmd;
} rx;
struct {
__le16 family_code;
__le16 security_code;
__u8 fw_version;
} fw;
};
#define DELCOM_GREEN_LED 0
#define DELCOM_RED_LED 1
#define DELCOM_BLUE_LED 2
struct hidled_device;
struct hidled_rgb;
struct hidled_config {
enum hidled_type type;
const char *name;
const char *short_name;
enum led_brightness max_brightness;
int num_leds;
size_t report_size;
enum hidled_report_type report_type;
int (*init)(struct hidled_device *ldev);
int (*write)(struct led_classdev *cdev, enum led_brightness br);
};
struct hidled_led {
struct led_classdev cdev;
struct hidled_rgb *rgb;
char name[32];
};
struct hidled_rgb {
struct hidled_device *ldev;
struct hidled_led red;
struct hidled_led green;
struct hidled_led blue;
u8 num;
};
struct hidled_device {
const struct hidled_config *config;
struct hid_device *hdev;
struct hidled_rgb *rgb;
u8 *buf;
struct mutex lock;
};
#define MAX_REPORT_SIZE 16
#define to_hidled_led(arg) container_of(arg, struct hidled_led, cdev)
static bool riso_kagaku_switch_green_blue;
module_param(riso_kagaku_switch_green_blue, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(riso_kagaku_switch_green_blue,
"switch green and blue RGB component for Riso Kagaku devices");
static int hidled_send(struct hidled_device *ldev, __u8 *buf)
{
int ret;
mutex_lock(&ldev->lock);
/*
* buffer provided to hid_hw_raw_request must not be on the stack
* and must not be part of a data structure
*/
memcpy(ldev->buf, buf, ldev->config->report_size);
if (ldev->config->report_type == RAW_REQUEST)
ret = hid_hw_raw_request(ldev->hdev, buf[0], ldev->buf,
ldev->config->report_size,
HID_FEATURE_REPORT,
HID_REQ_SET_REPORT);
else if (ldev->config->report_type == OUTPUT_REPORT)
ret = hid_hw_output_report(ldev->hdev, ldev->buf,
ldev->config->report_size);
else
ret = -EINVAL;
mutex_unlock(&ldev->lock);
if (ret < 0)
return ret;
return ret == ldev->config->report_size ? 0 : -EMSGSIZE;
}
/* reading data is supported for report type RAW_REQUEST only */
static int hidled_recv(struct hidled_device *ldev, __u8 *buf)
{
int ret;
if (ldev->config->report_type != RAW_REQUEST)
return -EINVAL;
mutex_lock(&ldev->lock);
memcpy(ldev->buf, buf, ldev->config->report_size);
ret = hid_hw_raw_request(ldev->hdev, buf[0], ldev->buf,
ldev->config->report_size,
HID_FEATURE_REPORT,
HID_REQ_SET_REPORT);
if (ret < 0)
goto err;
ret = hid_hw_raw_request(ldev->hdev, buf[0], ldev->buf,
ldev->config->report_size,
HID_FEATURE_REPORT,
HID_REQ_GET_REPORT);
memcpy(buf, ldev->buf, ldev->config->report_size);
err:
mutex_unlock(&ldev->lock);
return ret < 0 ? ret : 0;
}
static u8 riso_kagaku_index(struct hidled_rgb *rgb)
{
enum led_brightness r, g, b;
r = rgb->red.cdev.brightness;
g = rgb->green.cdev.brightness;
b = rgb->blue.cdev.brightness;
if (riso_kagaku_switch_green_blue)
return RISO_KAGAKU_IX(r, b, g);
else
return RISO_KAGAKU_IX(r, g, b);
}
static int riso_kagaku_write(struct led_classdev *cdev, enum led_brightness br)
{
struct hidled_led *led = to_hidled_led(cdev);
struct hidled_rgb *rgb = led->rgb;
__u8 buf[MAX_REPORT_SIZE] = {};
buf[1] = riso_kagaku_index(rgb);
return hidled_send(rgb->ldev, buf);
}
static int dream_cheeky_write(struct led_classdev *cdev, enum led_brightness br)
{
struct hidled_led *led = to_hidled_led(cdev);
struct hidled_rgb *rgb = led->rgb;
__u8 buf[MAX_REPORT_SIZE] = {};
buf[1] = rgb->red.cdev.brightness;
buf[2] = rgb->green.cdev.brightness;
buf[3] = rgb->blue.cdev.brightness;
buf[7] = 0x1a;
buf[8] = 0x05;
return hidled_send(rgb->ldev, buf);
}
static int dream_cheeky_init(struct hidled_device *ldev)
{
__u8 buf[MAX_REPORT_SIZE] = {};
/* Dream Cheeky magic */
buf[1] = 0x1f;
buf[2] = 0x02;
buf[4] = 0x5f;
buf[7] = 0x1a;
buf[8] = 0x03;
return hidled_send(ldev, buf);
}
static int _thingm_write(struct led_classdev *cdev, enum led_brightness br,
u8 offset)
{
struct hidled_led *led = to_hidled_led(cdev);
__u8 buf[MAX_REPORT_SIZE] = { 1, 'c' };
buf[2] = led->rgb->red.cdev.brightness;
buf[3] = led->rgb->green.cdev.brightness;
buf[4] = led->rgb->blue.cdev.brightness;
buf[7] = led->rgb->num + offset;
return hidled_send(led->rgb->ldev, buf);
}
static int thingm_write_v1(struct led_classdev *cdev, enum led_brightness br)
{
return _thingm_write(cdev, br, 0);
}
static int thingm_write(struct led_classdev *cdev, enum led_brightness br)
{
return _thingm_write(cdev, br, 1);
}
static const struct hidled_config hidled_config_thingm_v1 = {
.name = "ThingM blink(1) v1",
.short_name = "thingm",
.max_brightness = 255,
.num_leds = 1,
.report_size = 9,
.report_type = RAW_REQUEST,
.write = thingm_write_v1,
};
static int thingm_init(struct hidled_device *ldev)
{
__u8 buf[MAX_REPORT_SIZE] = { 1, 'v' };
int ret;
ret = hidled_recv(ldev, buf);
if (ret)
return ret;
/* Check for firmware major version 1 */
if (buf[3] == '1')
ldev->config = &hidled_config_thingm_v1;
return 0;
}
static inline int delcom_get_lednum(const struct hidled_led *led)
{
if (led == &led->rgb->red)
return DELCOM_RED_LED;
else if (led == &led->rgb->green)
return DELCOM_GREEN_LED;
else
return DELCOM_BLUE_LED;
}
static int delcom_enable_led(struct hidled_led *led)
{
union delcom_packet dp = { .tx.major_cmd = 101, .tx.minor_cmd = 12 };
dp.tx.data_lsb = 1 << delcom_get_lednum(led);
dp.tx.data_msb = 0;
return hidled_send(led->rgb->ldev, dp.data);
}
static int delcom_set_pwm(struct hidled_led *led)
{
union delcom_packet dp = { .tx.major_cmd = 101, .tx.minor_cmd = 34 };
dp.tx.data_lsb = delcom_get_lednum(led);
dp.tx.data_msb = led->cdev.brightness;
return hidled_send(led->rgb->ldev, dp.data);
}
static int delcom_write(struct led_classdev *cdev, enum led_brightness br)
{
struct hidled_led *led = to_hidled_led(cdev);
int ret;
/*
* enable LED
* We can't do this in the init function already because the device
* is internally reset later.
*/
ret = delcom_enable_led(led);
if (ret)
return ret;
return delcom_set_pwm(led);
}
static int delcom_init(struct hidled_device *ldev)
{
union delcom_packet dp = { .rx.cmd = 104 };
int ret;
ret = hidled_recv(ldev, dp.data);
if (ret)
return ret;
/*
* Several Delcom devices share the same USB VID/PID
* Check for family id 2 for Visual Signal Indicator
*/
return le16_to_cpu(dp.fw.family_code) == 2 ? 0 : -ENODEV;
}
static int luxafor_write(struct led_classdev *cdev, enum led_brightness br)
{
struct hidled_led *led = to_hidled_led(cdev);
__u8 buf[MAX_REPORT_SIZE] = { [1] = 1 };
buf[2] = led->rgb->num + 1;
buf[3] = led->rgb->red.cdev.brightness;
buf[4] = led->rgb->green.cdev.brightness;
buf[5] = led->rgb->blue.cdev.brightness;
return hidled_send(led->rgb->ldev, buf);
}
static const struct hidled_config hidled_configs[] = {
{
.type = RISO_KAGAKU,
.name = "Riso Kagaku Webmail Notifier",
.short_name = "riso_kagaku",
.max_brightness = 1,
.num_leds = 1,
.report_size = 6,
.report_type = OUTPUT_REPORT,
.write = riso_kagaku_write,
},
{
.type = DREAM_CHEEKY,
.name = "Dream Cheeky Webmail Notifier",
.short_name = "dream_cheeky",
.max_brightness = 31,
.num_leds = 1,
.report_size = 9,
.report_type = RAW_REQUEST,
.init = dream_cheeky_init,
.write = dream_cheeky_write,
},
{
.type = THINGM,
.name = "ThingM blink(1)",
.short_name = "thingm",
.max_brightness = 255,
.num_leds = 2,
.report_size = 9,
.report_type = RAW_REQUEST,
.init = thingm_init,
.write = thingm_write,
},
{
.type = DELCOM,
.name = "Delcom Visual Signal Indicator G2",
.short_name = "delcom",
.max_brightness = 100,
.num_leds = 1,
.report_size = 8,
.report_type = RAW_REQUEST,
.init = delcom_init,
.write = delcom_write,
},
{
.type = LUXAFOR,
.name = "Greynut Luxafor",
.short_name = "luxafor",
.max_brightness = 255,
.num_leds = 6,
.report_size = 9,
.report_type = OUTPUT_REPORT,
.write = luxafor_write,
},
};
static int hidled_init_led(struct hidled_led *led, const char *color_name,
struct hidled_rgb *rgb, unsigned int minor)
{
const struct hidled_config *config = rgb->ldev->config;
if (config->num_leds > 1)
snprintf(led->name, sizeof(led->name), "%s%u:%s:led%u",
config->short_name, minor, color_name, rgb->num);
else
snprintf(led->name, sizeof(led->name), "%s%u:%s",
config->short_name, minor, color_name);
led->cdev.name = led->name;
led->cdev.max_brightness = config->max_brightness;
led->cdev.brightness_set_blocking = config->write;
led->cdev.flags = LED_HW_PLUGGABLE;
led->rgb = rgb;
return devm_led_classdev_register(&rgb->ldev->hdev->dev, &led->cdev);
}
static int hidled_init_rgb(struct hidled_rgb *rgb, unsigned int minor)
{
int ret;
/* Register the red diode */
ret = hidled_init_led(&rgb->red, "red", rgb, minor);
if (ret)
return ret;
/* Register the green diode */
ret = hidled_init_led(&rgb->green, "green", rgb, minor);
if (ret)
return ret;
/* Register the blue diode */
return hidled_init_led(&rgb->blue, "blue", rgb, minor);
}
static int hidled_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct hidled_device *ldev;
unsigned int minor;
int ret, i;
ldev = devm_kzalloc(&hdev->dev, sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return -ENOMEM;
ldev->buf = devm_kmalloc(&hdev->dev, MAX_REPORT_SIZE, GFP_KERNEL);
if (!ldev->buf)
return -ENOMEM;
ret = hid_parse(hdev);
if (ret)
return ret;
ldev->hdev = hdev;
mutex_init(&ldev->lock);
for (i = 0; !ldev->config && i < ARRAY_SIZE(hidled_configs); i++)
if (hidled_configs[i].type == id->driver_data)
ldev->config = &hidled_configs[i];
if (!ldev->config)
return -EINVAL;
if (ldev->config->init) {
ret = ldev->config->init(ldev);
if (ret)
return ret;
}
ldev->rgb = devm_kcalloc(&hdev->dev, ldev->config->num_leds,
sizeof(struct hidled_rgb), GFP_KERNEL);
if (!ldev->rgb)
return -ENOMEM;
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret)
return ret;
minor = ((struct hidraw *) hdev->hidraw)->minor;
for (i = 0; i < ldev->config->num_leds; i++) {
ldev->rgb[i].ldev = ldev;
ldev->rgb[i].num = i;
ret = hidled_init_rgb(&ldev->rgb[i], minor);
if (ret) {
hid_hw_stop(hdev);
return ret;
}
}
hid_info(hdev, "%s initialized\n", ldev->config->name);
return 0;
}
static const struct hid_device_id hidled_table[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_RISO_KAGAKU,
USB_DEVICE_ID_RI_KA_WEBMAIL), .driver_data = RISO_KAGAKU },
{ HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY,
USB_DEVICE_ID_DREAM_CHEEKY_WN), .driver_data = DREAM_CHEEKY },
{ HID_USB_DEVICE(USB_VENDOR_ID_DREAM_CHEEKY,
USB_DEVICE_ID_DREAM_CHEEKY_FA), .driver_data = DREAM_CHEEKY },
{ HID_USB_DEVICE(USB_VENDOR_ID_THINGM,
USB_DEVICE_ID_BLINK1), .driver_data = THINGM },
{ HID_USB_DEVICE(USB_VENDOR_ID_DELCOM,
USB_DEVICE_ID_DELCOM_VISUAL_IND), .driver_data = DELCOM },
{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP,
USB_DEVICE_ID_LUXAFOR), .driver_data = LUXAFOR },
{ }
};
MODULE_DEVICE_TABLE(hid, hidled_table);
static struct hid_driver hidled_driver = {
.name = "hid-led",
.probe = hidled_probe,
.id_table = hidled_table,
};
module_hid_driver(hidled_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Heiner Kallweit <hkallweit1@gmail.com>");
MODULE_DESCRIPTION("Simple USB RGB LED driver");