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#PS:這個只是 《 我自己 》理解，如果和你的
#原則相沖突，請諒解，勿噴
EC20簡介
EC20是一個全網通的4G模塊，並提供了詳細的驅動移植資料(源碼+文檔)，我也僅僅是照着文檔，一點點的改，並建立起來一個可用的環境。
EC20驅動移植准備
1 首先你會從廠家拿到一個資料文件，並解壓(類似Quectel_GobiNetSR01A02V16.zip)
2 你會找到一個用戶手冊的PDF打開(類似Quectel_WCDMA<E_Linux_USB_Driver_User_Guide_V1.6.pdf)
3 這里還有一個Readme.txt告訴你需要閱讀上文pdf的哪些內容。可能如下：
About GobiNet driver, please refer to the chapter 3.2、3.4、5.4、6
About ConnectManager，please refer to the chapter 5.4
4 按照pdf指示如下。
EC20 Linux驅動移植
1 增加PID&VID(對着兩個不了解的，建議去找找資料來看看，這個的意思可以簡單理解為這個設備的唯一標識)
[KERNEL]/drivers/usb/serial/option.c
static const struct usb_device_id option_ids[] = {
#if 1 //Added by Sky
{ USB_DEVICE(0x05C6, 0x9090) }, /* Quectel UC15 */
{ USB_DEVICE(0x05C6, 0x9003) }, /* Quectel UC20 */
{ USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */
{ USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25/EC20 R2.0 */
{ USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */
#endif
這里其實只需要{ USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */ 這一項，其他是無關緊要的，可以不放進去。option_ids[]就是一usb serial的設備pid，vid表。
2 注釋掉沖突的vid以及pid設備(我猜存在相同的vid和pid是歷史的原因)
[KERNEL]/drivers/usb/serial/qcserial.c
//Comment by Sky,
//{USB_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
[KERNEL]/drivers/net/usb/qmi_wwan.c
//comment by Sky
//{QMI_GOBI_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
注意這里貌似只有EC20的沖突了。
3 添加零包處理(這個和usb 協議中的批量傳輸有關)
For Linux Kernel Version newer than 2.6.34:
File: [KERNEL]/drivers/usb/serial/usb_wwan.c
usb_fill_bulk_urb(urb, serial->dev, usb_sndbulkpipe(serial->dev, endpoint) | dir, buf, len, callback, ctx);
#if 1 //Added by Sky for Zero Packet
if (dir == USB_DIR_OUT)
{
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9090))
urb->transfer_flags |= URB_ZERO_PACKET;
if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9003))
urb->transfer_flags |= URB_ZERO_PACKET;
if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9215))
urb->transfer_flags |= URB_ZERO_PACKET;
if (desc->idVendor == cpu_to_le16(0x2C7C))
urb->transfer_flags |= URB_ZERO_PACKET;
}
#endif
注意，pdf上還有For Linux Kernel Version older than 2.6.35的內容，請自行根據內核版本查看。
4 增加休眠后喚醒接口
For Linux Kernel Version newer than 3.4:
File: [KERNEL]/drivers/usb/serial/option.c
static struct usb_serial_driver option_1port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "option1",
},
.description = "GSM modem (1-port)",
.id_table = option_ids,
.num_ports = 1,
.probe = option_probe,
.open = usb_wwan_open,
.close = usb_wwan_close,
.dtr_rts = usb_wwan_dtr_rts,
.write = usb_wwan_write,
.write_room = usb_wwan_write_room,
.chars_in_buffer = usb_wwan_chars_in_buffer,
.set_termios = usb_wwan_set_termios,
.tiocmget = usb_wwan_tiocmget,
.tiocmset = usb_wwan_tiocmset,
.ioctl = usb_wwan_ioctl,
.attach = option_attach,
.release = option_release,
.port_probe = usb_wwan_port_probe,
.port_remove = usb_wwan_port_remove,
.read_int_callback = option_instat_callback,
#ifdef CONFIG_PM
.suspend = usb_wwan_suspend,
.resume = usb_wwan_resume,
#if 1 //Added by Sky
.reset_resume = usb_wwan_resume,
#endif
#endif
};
5 如果要使用 GobiNet or QMI WWAN，需要阻止第四個接口注冊為串口。
For Linux Kernel Version newer than 2.6.30:
File: [KERNEL]/drivers/usb/serial/option.c
static int option_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
struct usb_interface_descriptor *iface_desc =
&serial->interface->cur_altsetting->desc;
struct usb_device_descriptor *dev_desc = &serial->dev->descriptor;
/* Never bind to the CD-Rom emulation interface */
if (iface_desc->bInterfaceClass == 0x08)
return -ENODEV;
/*
* Don't bind reserved interfaces (like network ones) which often have
* the same class/subclass/protocol as the serial interfaces. Look at
* the Windows driver .INF files for reserved interface numbers.
*/
if (is_blacklisted(
iface_desc->bInterfaceNumber,
OPTION_BLACKLIST_RESERVED_IF,
(const struct option_blacklist_info *) id->driver_info))
return -ENODEV;
/*
* Don't bind network interface on Samsung GT-B3730, it is handled by
* a separate module.
*/
if (dev_desc->idVendor == cpu_to_le16(SAMSUNG_VENDOR_ID) &&
dev_desc->idProduct == cpu_to_le16(SAMSUNG_PRODUCT_GT_B3730) &&
iface_desc->bInterfaceClass != USB_CLASS_CDC_DATA)
return -ENODEV;
#if 1 //Added by Sky
//Quectel UC20's interface 4 can be used as USB Network device
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003) \
&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
return -ENODEV;
//Quectel EC20's interface 4 can be used as USB Network device
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215) \
&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
return -ENODEV;
//Quectel EC21&EC25&EC20 R2.0's interface 4 can be used as USB Network device
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C) \
&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
return -ENODEV;
#endif
/* Store device id so we can use it during attach. */
usb_set_serial_data(serial, (void *)id);
return 0;
}
6 修改內核配置，並編譯內核，刷入新內核
添加USB 串口 GSM 和 CDMA 驅動選項
啟用USB網絡支持
添加驅動代碼
//Step 5: Please add the following statements to file "[KERNEL]/drivers/net/usb/Makefile" ([KERNEL]/drivers/usb/net/Makefile if the kernel version is older than 2.6.22).
obj-y += GobiNet.o
GobiNet-objs := GobiUSBNet.o QMIDevice.o QMI.o
7 quectel-CM 測試
//交叉編譯quectel-CM
/*quectel-CM will call busybox udhpc to obtain IP and NDS, and busybox udhpc will call script file /usr/share/udhcpc/default.script to set IP/DNS/Routing table for Linux board. You can download this tool’s source code from /. You should enable CONFIG_UDHCPC in busybox menuconfig，and copy the script file [BUSYBOX]/examples/udhcp/simple.script to your Linux board (renamed as /usr/share/udhcpc/default.script). */
quectel-CM –s ctnet &
[01-01_00:26:45:355] Quectel_ConnectManager_SR01A01V10
[01-01_00:26:45:356] ./quectel-CM profile = ctnet///, pincode =
[01-01_00:26:45:357] Find qmichannel = /dev/qcqmi2
[01-01_00:26:45:358] Find usbnet_adapter = eth2
[01-01_00:26:45:368] Get clientWDS = 7
[01-01_00:26:45:400] Get clientDMS = 8
[01-01_00:26:45:432] Get clientNAS = 9
[01-01_00:26:45:464] Get clientWDA = 10
[01-01_00:26:45:496] requestBaseBandVersion EC20CQAR02A03E2G_BETA0914 1 [Sep 14 13:51:27]
[01-01_00:26:45:560] requestGetSIMStatus SIMStatus: SIM_READY
[01-01_00:26:45:624] requestGetProfile ctnet///0
[01-01_00:26:45:656] requestRegistrationState MCC: 460, MNC: 11, PS: Attached, DataCap: LTE
[01-01_00:26:45:688] requestQueryDataCall ConnectionStatus: DISCONNECTED
[01-01_00:26:45:720] requestRegistrationState MCC: 460, MNC: 11, PS: Attached, DataCap: LTE
[01-01_00:26:45:752] requestQueryDataCall ConnectionStatus: DISCONNECTED
[01-01_00:26:45:816] requestSetupDataCall WdsConnectionIPv4Handle: 0x43cc4478
[01-01_00:26:45:912] requestQueryDataCall ConnectionStatus: CONNECTED
[01-01_00:26:45:937] udhcpc (v1.20.2) started
[01-01_00:26:45:956] Sending discover...
[01-01_00:26:45:960] Sending select for 10.172.27.151...
[01-01_00:26:45:964] Lease of 10.172.27.151 obtained, lease time 7200
[01-01_00:26:45:984] deleting routers
route: SIOCDELRT: No such process
[01-01_00:26:46:003] adding dns 61.132.163.68
[01-01_00:26:46:003] adding dns 202.102.213.68
注意，這里需要UDHCPC ，檢測你的busybox是否有這個東西，如果不存在，你需要重新移植busybox，啟用CONFIG_UDHCPC選項。還需要配置一個配置文件，注意檢查。
特別提示，其中很多關於內核源碼修改，以及內核配置修改，不同的版本有不同的寫法，文檔里面都有詳細說明，請使用時，特別注意。
#PS：請尊重原創，不喜勿噴
#PS：要轉載請注明出處，本人版權所有.
有問題請留言，看到后我會第一時間回復
