projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1157f69b WT |
1 | /* |
| 2 | * USB Wishbone-Serial adapter driver | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de> | |
| 5 | * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License | |
| 9 | * as published by the Free Software Foundation; either version 2 | |
| 10 | * of the License, or (at your option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/tty.h> | |
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/usb.h> | |
| 18 | #include <linux/usb/serial.h> | |
| 19 | #include <linux/uaccess.h> | |
| 20 | ||
| 21 | #define GSI_VENDOR_OPENCLOSE 0xB0 | |
| 22 | ||
| 23 | static const struct usb_device_id id_table[] = { | |
| 24 | { USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) }, | |
| 25 | { }, | |
| 26 | }; | |
| 27 | MODULE_DEVICE_TABLE(usb, id_table); | |
| 28 | ||
| 29 | /* | |
| 30 | * Etherbone must be told that a new stream has begun before data arrives. | |
| 31 | * This is necessary to restart the negotiation of Wishbone bus parameters. | |
| 32 | * Similarly, when the stream ends, Etherbone must be told so that the cycle | |
| 33 | * line can be driven low in the case that userspace failed to do so. | |
| 34 | */ | |
| 35 | static int usb_gsi_openclose(struct usb_serial_port *port, int value) | |
| 36 | { | |
| 37 | struct usb_device *dev = port->serial->dev; | |
| 38 | ||
| 39 | return usb_control_msg( | |
| 40 | dev, | |
| 41 | usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */ | |
| 42 | GSI_VENDOR_OPENCLOSE, | |
| 43 | USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, | |
| 44 | value, /* wValue = device is open(1) or closed(0) */ | |
| 45 | port->serial->interface->cur_altsetting->desc.bInterfaceNumber, | |
| b8a261b5 | 46 | NULL, 0, /* There is no data stage */ |
| 1157f69b WT |
47 | 5000); /* Timeout till operation fails */ |
| 48 | } | |
| 49 | ||
| 50 | static int wishbone_serial_open(struct tty_struct *tty, | |
| 51 | struct usb_serial_port *port) | |
| 52 | { | |
| 53 | int retval; | |
| 54 | ||
| 55 | retval = usb_gsi_openclose(port, 1); | |
| 56 | if (retval) { | |
| 57 | dev_err(&port->serial->dev->dev, | |
| 58 | "Could not mark device as open (%d)\n", | |
| 59 | retval); | |
| 60 | return retval; | |
| 61 | } | |
| 62 | ||
| 63 | retval = usb_serial_generic_open(tty, port); | |
| 64 | if (retval) | |
| 65 | usb_gsi_openclose(port, 0); | |
| 66 | ||
| 67 | return retval; | |
| 68 | } | |
| 69 | ||
| 70 | static void wishbone_serial_close(struct usb_serial_port *port) | |
| 71 | { | |
| 72 | usb_serial_generic_close(port); | |
| 73 | usb_gsi_openclose(port, 0); | |
| 74 | } | |
| 75 | ||
| 76 | static struct usb_serial_driver wishbone_serial_device = { | |
| 77 | .driver = { | |
| 78 | .owner = THIS_MODULE, | |
| 79 | .name = "wishbone_serial", | |
| 80 | }, | |
| 81 | .id_table = id_table, | |
| 82 | .num_ports = 1, | |
| 83 | .open = &wishbone_serial_open, | |
| 84 | .close = &wishbone_serial_close, | |
| 85 | }; | |
| 86 | ||
| 87 | static struct usb_serial_driver * const serial_drivers[] = { | |
| 88 | &wishbone_serial_device, NULL | |
| 89 | }; | |
| 90 | ||
| 91 | module_usb_serial_driver(serial_drivers, id_table); | |
| 92 | ||
| 93 | MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>"); | |
| 94 | MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); | |
| 95 | MODULE_LICENSE("GPL"); |