1 files changed, 207 insertions, 97 deletions

diff --git a/drivers/hid/hid-thingm.c b/drivers/hid/hid-thingm.c
index e3b6647e00ce..0af0eb446636 100644
--- a/drivers/hid/hid-thingm.c
+++ b/drivers/hid/hid-thingm.c
@@ -1,7 +1,7 @@
 /*
  * 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
@@ -10,170 +10,280 @@
  */
 
 #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);
 }