/*
* ThingM blink(1) USB RGB LED driver
*
- * Copyright 2013 Savoir-faire Linux Inc.
+ * Copyright 2013-2014 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or
*/
#include <linux/hid.h>
+#include <linux/hidraw.h>
#include <linux/leds.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
#include "hid-ids.h"
-#define BLINK1_CMD_SIZE 9
+#define REPORT_ID 1
+#define REPORT_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)
+/* Firmware major number of supported devices */
+#define THINGM_MAJOR_MK1 '1'
-/**
- * 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 thingm_fwinfo {
+ char major;
+ unsigned numrgb;
+ unsigned first;
+};
+
+const struct thingm_fwinfo thingm_fwinfo[] = {
+ {
+ .major = THINGM_MAJOR_MK1,
+ .numrgb = 1,
+ .first = 0,
+ }
+};
+
+/* A red, green or blue channel, part of an RGB chip */
+struct thingm_led {
+ struct thingm_rgb *rgb;
+ struct led_classdev ldev;
+ char name[32];
+};
+
+/* Basically a WS2812 5050 RGB LED chip */
+struct thingm_rgb {
+ struct thingm_device *tdev;
+ struct thingm_led red;
+ struct thingm_led green;
+ struct thingm_led blue;
+ struct work_struct work;
+ u8 num;
+};
+
+struct thingm_device {
struct hid_device *hdev;
- struct led_classdev led_cdev;
- u32 rgb;
- u8 brightness;
+ struct {
+ char major;
+ char minor;
+ } version;
+ const struct thingm_fwinfo *fwinfo;
+ struct mutex lock;
+ struct thingm_rgb *rgb;
};
-static int blink1_send_command(struct blink1_data *data,
- u8 buf[BLINK1_CMD_SIZE])
+static int thingm_send(struct thingm_device *tdev, u8 buf[REPORT_SIZE])
{
int ret;
- hid_dbg(data->hdev, "command: %d%c%.2x%.2x%.2x%.2x%.2x%.2x%.2x\n",
+ hid_dbg(tdev->hdev, "-> %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\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);
+ ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE,
+ HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
return ret < 0 ? ret : 0;
}
-static int blink1_update_color(struct blink1_data *data)
+static int thingm_recv(struct thingm_device *tdev, u8 buf[REPORT_SIZE])
{
- u8 buf[BLINK1_CMD_SIZE] = { 1, 'n', 0, 0, 0, 0, 0, 0, 0 };
+ int ret;
- if (data->brightness) {
- unsigned int coef = DIV_ROUND_CLOSEST(255, data->brightness);
+ ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE,
+ HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+ if (ret < 0)
+ return ret;
- 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);
- }
+ hid_dbg(tdev->hdev, "<- %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n",
+ buf[0], buf[1], buf[2], buf[3], buf[4],
+ buf[5], buf[6], buf[7], buf[8]);
- return blink1_send_command(data, buf);
+ return 0;
}
-static void blink1_led_set(struct led_classdev *led_cdev,
- enum led_brightness brightness)
+static int thingm_version(struct thingm_device *tdev)
{
- struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
+ u8 buf[REPORT_SIZE] = { REPORT_ID, 'v', 0, 0, 0, 0, 0, 0, 0 };
+ int err;
+
+ err = thingm_send(tdev, buf);
+ if (err)
+ return err;
+
+ err = thingm_recv(tdev, buf);
+ if (err)
+ return err;
- data->brightness = brightness;
- if (blink1_update_color(data))
- hid_err(data->hdev, "failed to update color\n");
+ tdev->version.major = buf[3];
+ tdev->version.minor = buf[4];
+
+ return 0;
}
-static enum led_brightness blink1_led_get(struct led_classdev *led_cdev)
+static int thingm_write_color(struct thingm_rgb *rgb)
{
- struct blink1_data *data = dev_get_drvdata(led_cdev->dev->parent);
+ u8 buf[REPORT_SIZE] = { REPORT_ID, 'n', 0, 0, 0, 0, 0, 0, 0 };
+
+ buf[2] = rgb->red.ldev.brightness;
+ buf[3] = rgb->green.ldev.brightness;
+ buf[4] = rgb->blue.ldev.brightness;
- return data->brightness;
+ return thingm_send(rgb->tdev, buf);
}
-static ssize_t blink1_show_rgb(struct device *dev,
- struct device_attribute *attr, char *buf)
+static void thingm_work(struct work_struct *work)
{
- struct blink1_data *data = dev_get_drvdata(dev->parent);
+ struct thingm_rgb *rgb = container_of(work, struct thingm_rgb, work);
- return sprintf(buf, "%.6X\n", data->rgb);
+ mutex_lock(&rgb->tdev->lock);
+
+ if (thingm_write_color(rgb))
+ hid_err(rgb->tdev->hdev, "failed to write color\n");
+
+ mutex_unlock(&rgb->tdev->lock);
}
-static ssize_t blink1_store_rgb(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t count)
+static void thingm_led_set(struct led_classdev *ldev,
+ enum led_brightness brightness)
{
- struct blink1_data *data = dev_get_drvdata(dev->parent);
- long unsigned int rgb;
- int ret;
+ struct thingm_led *led = container_of(ldev, struct thingm_led, ldev);
- ret = kstrtoul(buf, 16, &rgb);
- if (ret)
- return ret;
+ /* the ledclass has already stored the brightness value */
+ schedule_work(&led->rgb->work);
+}
- /* RGB triplet notation is 24-bit hexadecimal */
- if (rgb > 0xFFFFFF)
- return -EINVAL;
+static int thingm_init_rgb(struct thingm_rgb *rgb)
+{
+ const int minor = ((struct hidraw *) rgb->tdev->hdev->hidraw)->minor;
+ int err;
+
+ /* Register the red diode */
+ snprintf(rgb->red.name, sizeof(rgb->red.name),
+ "thingm%d:red:led%d", minor, rgb->num);
+ rgb->red.ldev.name = rgb->red.name;
+ rgb->red.ldev.max_brightness = 255;
+ rgb->red.ldev.brightness_set = thingm_led_set;
+ rgb->red.rgb = rgb;
+
+ err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->red.ldev);
+ if (err)
+ return err;
+
+ /* Register the green diode */
+ snprintf(rgb->green.name, sizeof(rgb->green.name),
+ "thingm%d:green:led%d", minor, rgb->num);
+ rgb->green.ldev.name = rgb->green.name;
+ rgb->green.ldev.max_brightness = 255;
+ rgb->green.ldev.brightness_set = thingm_led_set;
+ rgb->green.rgb = rgb;
+
+ err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->green.ldev);
+ if (err)
+ goto unregister_red;
+
+ /* Register the blue diode */
+ snprintf(rgb->blue.name, sizeof(rgb->blue.name),
+ "thingm%d:blue:led%d", minor, rgb->num);
+ rgb->blue.ldev.name = rgb->blue.name;
+ rgb->blue.ldev.max_brightness = 255;
+ rgb->blue.ldev.brightness_set = thingm_led_set;
+ rgb->blue.rgb = rgb;
+
+ err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->blue.ldev);
+ if (err)
+ goto unregister_green;
+
+ INIT_WORK(&rgb->work, thingm_work);
- data->rgb = rgb;
- ret = blink1_update_color(data);
+ return 0;
- return ret ? ret : count;
-}
+unregister_green:
+ led_classdev_unregister(&rgb->green.ldev);
-static DEVICE_ATTR(rgb, S_IRUGO | S_IWUSR, blink1_show_rgb, blink1_store_rgb);
+unregister_red:
+ led_classdev_unregister(&rgb->red.ldev);
-static const struct attribute_group blink1_sysfs_group = {
- .attrs = (struct attribute *[]) {
- &dev_attr_rgb.attr,
- NULL
- },
-};
+ return err;
+}
+
+static void thingm_remove_rgb(struct thingm_rgb *rgb)
+{
+ flush_work(&rgb->work);
+ led_classdev_unregister(&rgb->red.ldev);
+ led_classdev_unregister(&rgb->green.ldev);
+ led_classdev_unregister(&rgb->blue.ldev);
+}
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;
+ struct thingm_device *tdev;
+ int i, err;
- data = devm_kzalloc(&hdev->dev, sizeof(struct blink1_data), GFP_KERNEL);
- if (!data)
+ tdev = devm_kzalloc(&hdev->dev, sizeof(struct thingm_device),
+ GFP_KERNEL);
+ if (!tdev)
return -ENOMEM;
- hid_set_drvdata(hdev, data);
- data->hdev = hdev;
- data->rgb = 0xFFFFFF; /* set a default white color */
+ tdev->hdev = hdev;
+ hid_set_drvdata(hdev, tdev);
- ret = hid_parse(hdev);
- if (ret)
+ err = hid_parse(hdev);
+ if (err)
goto error;
- ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
- if (ret)
+ err = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
+ if (err)
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)
+ mutex_init(&tdev->lock);
+
+ err = thingm_version(tdev);
+ if (err)
goto stop;
- ret = sysfs_create_group(&led->dev->kobj, &blink1_sysfs_group);
- if (ret)
- goto remove_led;
+ hid_dbg(hdev, "firmware version: %c.%c\n",
+ tdev->version.major, tdev->version.minor);
- return 0;
+ for (i = 0; i < ARRAY_SIZE(thingm_fwinfo) && !tdev->fwinfo; ++i)
+ if (thingm_fwinfo[i].major == tdev->version.major)
+ tdev->fwinfo = &thingm_fwinfo[i];
+
+ if (!tdev->fwinfo) {
+ hid_err(hdev, "unsupported firmware %c\n", tdev->version.major);
+ goto stop;
+ }
+
+ tdev->rgb = devm_kzalloc(&hdev->dev,
+ sizeof(struct thingm_rgb) * tdev->fwinfo->numrgb,
+ GFP_KERNEL);
+ if (!tdev->rgb) {
+ err = -ENOMEM;
+ goto stop;
+ }
+
+ for (i = 0; i < tdev->fwinfo->numrgb; ++i) {
+ struct thingm_rgb *rgb = tdev->rgb + i;
+
+ rgb->tdev = tdev;
+ rgb->num = tdev->fwinfo->first + i;
+ err = thingm_init_rgb(rgb);
+ if (err) {
+ while (--i >= 0)
+ thingm_remove_rgb(tdev->rgb + i);
+ goto stop;
+ }
+ }
-remove_led:
- led_classdev_unregister(led);
+ return 0;
stop:
hid_hw_stop(hdev);
error:
- return ret;
+ return err;
}
static void thingm_remove(struct hid_device *hdev)
{
- struct blink1_data *data = hid_get_drvdata(hdev);
- struct led_classdev *led = &data->led_cdev;
+ struct thingm_device *tdev = hid_get_drvdata(hdev);
+ int i;
+
+ for (i = 0; i < tdev->fwinfo->numrgb; ++i)
+ thingm_remove_rgb(tdev->rgb + i);
- sysfs_remove_group(&led->dev->kobj, &blink1_sysfs_group);
- led_classdev_unregister(led);
hid_hw_stop(hdev);
}
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff