1 files changed, 313 insertions, 0 deletions
diff --git a/drivers/hid/hid-thingm.c b/drivers/hid/hid-thingm.c
new file mode 100644
index 000000000..b95d3978c
--- /dev/null
+++ b/drivers/hid/hid-thingm.c
@@ -0,0 +1,313 @@
+/*
+ * ThingM blink(1) USB RGB LED driver
+ *
+ * Copyright 2013-2014 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/hidraw.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+
+#include "hid-ids.h"
+
+#define REPORT_ID	1
+#define REPORT_SIZE	9
+
+/* Firmware major number of supported devices */
+#define THINGM_MAJOR_MK1	'1'
+#define THINGM_MAJOR_MK2	'2'
+
+struct thingm_fwinfo {
+	char major;
+	unsigned numrgb;
+	unsigned first;
+};
+
+static const struct thingm_fwinfo thingm_fwinfo[] = {
+	{
+		.major = THINGM_MAJOR_MK1,
+		.numrgb = 1,
+		.first = 0,
+	}, {
+		.major = THINGM_MAJOR_MK2,
+		.numrgb = 2,
+		.first = 1,
+	}
+};
+
+/* 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 {
+		char major;
+		char minor;
+	} version;
+	const struct thingm_fwinfo *fwinfo;
+	struct mutex lock;
+	struct thingm_rgb *rgb;
+};
+
+static int thingm_send(struct thingm_device *tdev, u8 buf[REPORT_SIZE])
+{
+	int ret;
+
+	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(tdev->hdev, buf[0], buf, REPORT_SIZE,
+			HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+
+	return ret < 0 ? ret : 0;
+}
+
+static int thingm_recv(struct thingm_device *tdev, u8 buf[REPORT_SIZE])
+{
+	int ret;
+
+	ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE,
+			HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
+	if (ret < 0)
+		return ret;
+
+	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 0;
+}
+
+static int thingm_version(struct thingm_device *tdev)
+{
+	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;
+
+	tdev->version.major = buf[3];
+	tdev->version.minor = buf[4];
+
+	return 0;
+}
+
+static int thingm_write_color(struct thingm_rgb *rgb)
+{
+	u8 buf[REPORT_SIZE] = { REPORT_ID, 'c', 0, 0, 0, 0, 0, rgb->num, 0 };
+
+	buf[2] = rgb->red.ldev.brightness;
+	buf[3] = rgb->green.ldev.brightness;
+	buf[4] = rgb->blue.ldev.brightness;
+
+	return thingm_send(rgb->tdev, buf);
+}
+
+static void thingm_work(struct work_struct *work)
+{
+	struct thingm_rgb *rgb = container_of(work, struct thingm_rgb, work);
+
+	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 void thingm_led_set(struct led_classdev *ldev,
+		enum led_brightness brightness)
+{
+	struct thingm_led *led = container_of(ldev, struct thingm_led, ldev);
+
+	/* the ledclass has already stored the brightness value */
+	schedule_work(&led->rgb->work);
+}
+
+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);
+
+	return 0;
+
+unregister_green:
+	led_classdev_unregister(&rgb->green.ldev);
+
+unregister_red:
+	led_classdev_unregister(&rgb->red.ldev);
+
+	return err;
+}
+
+static void thingm_remove_rgb(struct thingm_rgb *rgb)
+{
+	led_classdev_unregister(&rgb->red.ldev);
+	led_classdev_unregister(&rgb->green.ldev);
+	led_classdev_unregister(&rgb->blue.ldev);
+	flush_work(&rgb->work);
+}
+
+static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	struct thingm_device *tdev;
+	int i, err;
+
+	tdev = devm_kzalloc(&hdev->dev, sizeof(struct thingm_device),
+			GFP_KERNEL);
+	if (!tdev)
+		return -ENOMEM;
+
+	tdev->hdev = hdev;
+	hid_set_drvdata(hdev, tdev);
+
+	err = hid_parse(hdev);
+	if (err)
+		goto error;
+
+	err = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
+	if (err)
+		goto error;
+
+	mutex_init(&tdev->lock);
+
+	err = thingm_version(tdev);
+	if (err)
+		goto stop;
+
+	hid_dbg(hdev, "firmware version: %c.%c\n",
+			tdev->version.major, tdev->version.minor);
+
+	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);
+		err = -ENODEV;
+		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;
+		}
+	}
+
+	return 0;
+stop:
+	hid_hw_stop(hdev);
+error:
+	return err;
+}
+
+static void thingm_remove(struct hid_device *hdev)
+{
+	struct thingm_device *tdev = hid_get_drvdata(hdev);
+	int i;
+
+	hid_hw_stop(hdev);
+
+	for (i = 0; i < tdev->fwinfo->numrgb; ++i)
+		thingm_remove_rgb(tdev->rgb + i);
+}
+
+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");