1 // SPDX-License-Identifier: GPL-2.0-only
2 /* cypress_firmware.c is part of the DVB USB library.
5 * see dvb-usb-init.c for copyright information.
7 * This file contains functions for downloading the firmware to Cypress FX 1
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/usb.h>
15 #include <linux/firmware.h>
16 #include "cypress_firmware.h"
18 struct usb_cypress_controller {
20 const char *name; /* name of the usb controller */
21 u16 cs_reg; /* needs to be restarted,
22 * when the firmware has been downloaded */
25 static const struct usb_cypress_controller cypress[] = {
26 { .id = CYPRESS_AN2135, .name = "Cypress AN2135", .cs_reg = 0x7f92 },
27 { .id = CYPRESS_AN2235, .name = "Cypress AN2235", .cs_reg = 0x7f92 },
28 { .id = CYPRESS_FX2, .name = "Cypress FX2", .cs_reg = 0xe600 },
32 * load a firmware packet to the device
34 static int usb_cypress_writemem(struct usb_device *udev, u16 addr, u8 *data,
37 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
38 0xa0, USB_TYPE_VENDOR, addr, 0x00, data, len, 5000);
41 static int cypress_get_hexline(const struct firmware *fw,
42 struct hexline *hx, int *pos)
44 u8 *b = (u8 *) &fw->data[*pos];
50 memset(hx, 0, sizeof(struct hexline));
53 if ((*pos + hx->len + 4) >= fw->size)
56 hx->addr = b[1] | (b[2] << 8);
59 if (hx->type == 0x04) {
60 /* b[4] and b[5] are the Extended linear address record data
62 hx->addr |= (b[4] << 24) | (b[5] << 16);
65 memcpy(hx->data, &b[data_offs], hx->len);
66 hx->chk = b[hx->len + data_offs];
72 int cypress_load_firmware(struct usb_device *udev,
73 const struct firmware *fw, int type)
78 hx = kmalloc(sizeof(*hx), GFP_KERNEL);
84 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
86 dev_err(&udev->dev, "%s: CPU stop failed=%d\n",
92 /* write firmware to memory */
94 ret = cypress_get_hexline(fw, hx, &pos);
100 ret = usb_cypress_writemem(udev, hx->addr, hx->data, hx->len);
103 } else if (ret != hx->len) {
105 "%s: error while transferring firmware (transferred size=%d, block size=%d)\n",
106 KBUILD_MODNAME, ret, hx->len);
114 ret = usb_cypress_writemem(udev, cypress[type].cs_reg, hx->data, 1);
116 dev_err(&udev->dev, "%s: CPU start failed=%d\n",
117 KBUILD_MODNAME, ret);
127 EXPORT_SYMBOL(cypress_load_firmware);
130 MODULE_DESCRIPTION("Cypress firmware download");
131 MODULE_LICENSE("GPL");