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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/mfd/viperboard.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/viperboard.c')
-rw-r--r--drivers/mfd/viperboard.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
new file mode 100644
index 0000000000..ba867b7ecf
--- /dev/null
+++ b/drivers/mfd/viperboard.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Nano River Technologies viperboard driver
+ *
+ * This is the core driver for the viperboard. There are cell drivers
+ * available for I2C, ADC and both GPIOs. SPI is not yet supported.
+ * The drivers do not support all features the board exposes. See user
+ * manual of the viperboard.
+ *
+ * (C) 2012 by Lemonage GmbH
+ * Author: Lars Poeschel <poeschel@lemonage.de>
+ * All rights reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/viperboard.h>
+
+#include <linux/usb.h>
+
+
+static const struct usb_device_id vprbrd_table[] = {
+ { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, vprbrd_table);
+
+static const struct mfd_cell vprbrd_devs[] = {
+ {
+ .name = "viperboard-gpio",
+ },
+ {
+ .name = "viperboard-i2c",
+ },
+ {
+ .name = "viperboard-adc",
+ },
+};
+
+static int vprbrd_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct vprbrd *vb;
+
+ u16 version = 0;
+ int pipe, ret;
+
+ /* allocate memory for our device state and initialize it */
+ vb = kzalloc(sizeof(*vb), GFP_KERNEL);
+ if (!vb)
+ return -ENOMEM;
+
+ mutex_init(&vb->lock);
+
+ vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, vb);
+ dev_set_drvdata(&vb->pdev.dev, vb);
+
+ /* get version information, major first, minor then */
+ pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
+ ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
+ VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
+ VPRBRD_USB_TIMEOUT_MS);
+ if (ret == 1)
+ version = vb->buf[0];
+
+ ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
+ VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1,
+ VPRBRD_USB_TIMEOUT_MS);
+ if (ret == 1) {
+ version <<= 8;
+ version = version | vb->buf[0];
+ }
+
+ dev_info(&interface->dev,
+ "version %x.%02x found at bus %03d address %03d\n",
+ version >> 8, version & 0xff,
+ vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
+
+ ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs,
+ ARRAY_SIZE(vprbrd_devs));
+ if (ret != 0) {
+ dev_err(&interface->dev, "Failed to add mfd devices to core.");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ if (vb) {
+ usb_put_dev(vb->usb_dev);
+ kfree(vb);
+ }
+
+ return ret;
+}
+
+static void vprbrd_disconnect(struct usb_interface *interface)
+{
+ struct vprbrd *vb = usb_get_intfdata(interface);
+
+ mfd_remove_devices(&interface->dev);
+ usb_set_intfdata(interface, NULL);
+ usb_put_dev(vb->usb_dev);
+ kfree(vb);
+
+ dev_dbg(&interface->dev, "disconnected\n");
+}
+
+static struct usb_driver vprbrd_driver = {
+ .name = "viperboard",
+ .probe = vprbrd_probe,
+ .disconnect = vprbrd_disconnect,
+ .id_table = vprbrd_table,
+};
+
+module_usb_driver(vprbrd_driver);
+
+MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
+MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
+MODULE_LICENSE("GPL");