--- /dev/null
+/*
+ * 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");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff