1 files changed, 272 insertions, 0 deletions

diff --git a/drivers/hid/hid-thingm.c b/drivers/hid/hid-thingm.c
new file mode 100644
index 000000000000..2055a52e9a20
--- /dev/null
+++ b/drivers/hid/hid-thingm.c
@@ -0,0 +1,272 @@
+/*
+ * 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 <linux/usb.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 = data->hdev->hid_output_raw_report(data->hdev, buf,
+                        BLINK1_CMD_SIZE, HID_FEATURE_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");