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path: root/drivers/usb/misc/emi62.c
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Diffstat (limited to 'drivers/usb/misc/emi62.c')
-rw-r--r--drivers/usb/misc/emi62.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/drivers/usb/misc/emi62.c b/drivers/usb/misc/emi62.c
new file mode 100644
index 000000000..ebd99146f
--- /dev/null
+++ b/drivers/usb/misc/emi62.c
@@ -0,0 +1,273 @@
+/*
+ * Emagic EMI 2|6 usb audio interface firmware loader.
+ * Copyright (C) 2002
+ * Tapio Laxström (tapio.laxstrom@iptime.fi)
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/ihex.h>
+
+/* include firmware (variables)*/
+
+/* FIXME: This is quick and dirty solution! */
+#define SPDIF /* if you want SPDIF comment next line */
+//#undef SPDIF /* if you want MIDI uncomment this line */
+
+#ifdef SPDIF
+#define FIRMWARE_FW "/*(DEBLOBBED)*/"
+#else
+#define FIRMWARE_FW "/*(DEBLOBBED)*/"
+#endif
+
+#define EMI62_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */
+#define EMI62_PRODUCT_ID 0x0110 /* EMI 6|2m without firmware */
+
+#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
+#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */
+#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */
+#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */
+#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
+#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS)
+
+static int emi62_writememory(struct usb_device *dev, int address,
+ const unsigned char *data, int length,
+ __u8 bRequest);
+static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
+static int emi62_load_firmware (struct usb_device *dev);
+static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
+static void emi62_disconnect(struct usb_interface *intf);
+
+/* thanks to drivers/usb/serial/keyspan_pda.c code */
+static int emi62_writememory(struct usb_device *dev, int address,
+ const unsigned char *data, int length,
+ __u8 request)
+{
+ int result;
+ unsigned char *buffer = kmemdup(data, length, GFP_KERNEL);
+
+ if (!buffer) {
+ dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
+ return -ENOMEM;
+ }
+ /* Note: usb_control_msg returns negative value on error or length of the
+ * data that was written! */
+ result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
+ kfree (buffer);
+ return result;
+}
+
+/* thanks to drivers/usb/serial/keyspan_pda.c code */
+static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
+{
+ int response;
+ dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
+
+ response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
+ if (response < 0)
+ dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
+ return response;
+}
+
+#define FW_LOAD_SIZE 1023
+
+static int emi62_load_firmware (struct usb_device *dev)
+{
+ const struct firmware *loader_fw = NULL;
+ const struct firmware *bitstream_fw = NULL;
+ const struct firmware *firmware_fw = NULL;
+ const struct ihex_binrec *rec;
+ int err = -ENOMEM;
+ int i;
+ __u32 addr; /* Address to write */
+ __u8 *buf;
+
+ dev_dbg(&dev->dev, "load_firmware\n");
+ buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
+ if (!buf)
+ goto wraperr;
+
+ err = reject_firmware(&loader_fw, "/*(DEBLOBBED)*/", &dev->dev);
+ if (err)
+ goto nofw;
+
+ err = reject_firmware(&bitstream_fw, "/*(DEBLOBBED)*/",
+ &dev->dev);
+ if (err)
+ goto nofw;
+
+ err = reject_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
+ if (err) {
+ nofw:
+ goto wraperr;
+ }
+
+ /* Assert reset (stop the CPU in the EMI) */
+ err = emi62_set_reset(dev,1);
+ if (err < 0)
+ goto wraperr;
+
+ rec = (const struct ihex_binrec *)loader_fw->data;
+
+ /* 1. We need to put the loader for the FPGA into the EZ-USB */
+ while (rec) {
+ err = emi62_writememory(dev, be32_to_cpu(rec->addr),
+ rec->data, be16_to_cpu(rec->len),
+ ANCHOR_LOAD_INTERNAL);
+ if (err < 0)
+ goto wraperr;
+ rec = ihex_next_binrec(rec);
+ }
+
+ /* De-assert reset (let the CPU run) */
+ err = emi62_set_reset(dev,0);
+ if (err < 0)
+ goto wraperr;
+ msleep(250); /* let device settle */
+
+ /* 2. We upload the FPGA firmware into the EMI
+ * Note: collect up to 1023 (yes!) bytes and send them with
+ * a single request. This is _much_ faster! */
+ rec = (const struct ihex_binrec *)bitstream_fw->data;
+ do {
+ i = 0;
+ addr = be32_to_cpu(rec->addr);
+
+ /* intel hex records are terminated with type 0 element */
+ while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
+ memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
+ i += be16_to_cpu(rec->len);
+ rec = ihex_next_binrec(rec);
+ }
+ err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
+ if (err < 0)
+ goto wraperr;
+ } while (rec);
+
+ /* Assert reset (stop the CPU in the EMI) */
+ err = emi62_set_reset(dev,1);
+ if (err < 0)
+ goto wraperr;
+
+ /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
+ for (rec = (const struct ihex_binrec *)loader_fw->data;
+ rec; rec = ihex_next_binrec(rec)) {
+ err = emi62_writememory(dev, be32_to_cpu(rec->addr),
+ rec->data, be16_to_cpu(rec->len),
+ ANCHOR_LOAD_INTERNAL);
+ if (err < 0)
+ goto wraperr;
+ }
+
+ /* De-assert reset (let the CPU run) */
+ err = emi62_set_reset(dev,0);
+ if (err < 0)
+ goto wraperr;
+ msleep(250); /* let device settle */
+
+ /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
+
+ for (rec = (const struct ihex_binrec *)firmware_fw->data;
+ rec; rec = ihex_next_binrec(rec)) {
+ if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
+ err = emi62_writememory(dev, be32_to_cpu(rec->addr),
+ rec->data, be16_to_cpu(rec->len),
+ ANCHOR_LOAD_EXTERNAL);
+ if (err < 0)
+ goto wraperr;
+ }
+ }
+
+ /* Assert reset (stop the CPU in the EMI) */
+ err = emi62_set_reset(dev,1);
+ if (err < 0)
+ goto wraperr;
+
+ for (rec = (const struct ihex_binrec *)firmware_fw->data;
+ rec; rec = ihex_next_binrec(rec)) {
+ if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
+ err = emi62_writememory(dev, be32_to_cpu(rec->addr),
+ rec->data, be16_to_cpu(rec->len),
+ ANCHOR_LOAD_EXTERNAL);
+ if (err < 0)
+ goto wraperr;
+ }
+ }
+
+ /* De-assert reset (let the CPU run) */
+ err = emi62_set_reset(dev,0);
+ if (err < 0)
+ goto wraperr;
+ msleep(250); /* let device settle */
+
+ release_firmware(loader_fw);
+ release_firmware(bitstream_fw);
+ release_firmware(firmware_fw);
+
+ kfree(buf);
+
+ /* return 1 to fail the driver inialization
+ * and give real driver change to load */
+ return 1;
+
+wraperr:
+ if (err < 0)
+ dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
+ __func__, err);
+ release_firmware(loader_fw);
+ release_firmware(bitstream_fw);
+ release_firmware(firmware_fw);
+
+ kfree(buf);
+ dev_err(&dev->dev, "Error\n");
+ return err;
+}
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+ struct usb_device *dev = interface_to_usbdev(intf);
+ dev_dbg(&intf->dev, "emi62_probe\n");
+
+ dev_info(&intf->dev, "%s start\n", __func__);
+
+ emi62_load_firmware(dev);
+
+ /* do not return the driver context, let real audio driver do that */
+ return -EIO;
+}
+
+static void emi62_disconnect(struct usb_interface *intf)
+{
+}
+
+static struct usb_driver emi62_driver = {
+ .name = "emi62 - firmware loader",
+ .probe = emi62_probe,
+ .disconnect = emi62_disconnect,
+ .id_table = id_table,
+};
+
+module_usb_driver(emi62_driver);
+
+MODULE_AUTHOR("Tapio Laxström");
+MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
+MODULE_LICENSE("GPL");
+
+/*(DEBLOBBED)*/
+/* vi:ai:syntax=c:sw=8:ts=8:tw=80
+ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 09:51:46 +0000