1/* 2 * Driver for Option High Speed Mobile Devices. 3 * 4 * (c) 2008 Dan Williams <dcbw@redhat.com> 5 * 6 * Inspiration taken from sierra_ms.c by Kevin Lloyd <klloyd@sierrawireless.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23#include <linux/usb.h> 24#include <linux/slab.h> 25 26#include "usb.h" 27#include "transport.h" 28#include "option_ms.h" 29#include "debug.h" 30 31#define ZCD_FORCE_MODEM 0x01 32#define ZCD_ALLOW_MS 0x02 33 34static unsigned int option_zero_cd = ZCD_FORCE_MODEM; 35module_param(option_zero_cd, uint, S_IRUGO | S_IWUSR); 36MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default)," 37 " 2=Allow CD-Rom"); 38 39#define RESPONSE_LEN 1024 40 41static int option_rezero(struct us_data *us) 42{ 43 const unsigned char rezero_msg[] = { 44 0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12, 45 0x01, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x01, 46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 48 }; 49 char *buffer; 50 int result; 51 52 US_DEBUGP("Option MS: %s", "DEVICE MODE SWITCH\n"); 53 54 buffer = kzalloc(RESPONSE_LEN, GFP_KERNEL); 55 if (buffer == NULL) 56 return USB_STOR_TRANSPORT_ERROR; 57 58 memcpy(buffer, rezero_msg, sizeof(rezero_msg)); 59 result = usb_stor_bulk_transfer_buf(us, 60 us->send_bulk_pipe, 61 buffer, sizeof(rezero_msg), NULL); 62 if (result != USB_STOR_XFER_GOOD) { 63 result = USB_STOR_XFER_ERROR; 64 goto out; 65 } 66 67 /* Some of the devices need to be asked for a response, but we don't 68 * care what that response is. 69 */ 70 usb_stor_bulk_transfer_buf(us, 71 us->recv_bulk_pipe, 72 buffer, RESPONSE_LEN, NULL); 73 74 /* Read the CSW */ 75 usb_stor_bulk_transfer_buf(us, 76 us->recv_bulk_pipe, 77 buffer, 13, NULL); 78 79 result = USB_STOR_XFER_GOOD; 80 81out: 82 kfree(buffer); 83 return result; 84} 85 86static int option_inquiry(struct us_data *us) 87{ 88 const unsigned char inquiry_msg[] = { 89 0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78, 90 0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12, 91 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, 92 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 93 }; 94 char *buffer; 95 int result; 96 97 US_DEBUGP("Option MS: %s", "device inquiry for vendor name\n"); 98 99 buffer = kzalloc(0x24, GFP_KERNEL); 100 if (buffer == NULL) 101 return USB_STOR_TRANSPORT_ERROR; 102 103 memcpy(buffer, inquiry_msg, sizeof(inquiry_msg)); 104 result = usb_stor_bulk_transfer_buf(us, 105 us->send_bulk_pipe, 106 buffer, sizeof(inquiry_msg), NULL); 107 if (result != USB_STOR_XFER_GOOD) { 108 result = USB_STOR_XFER_ERROR; 109 goto out; 110 } 111 112 result = usb_stor_bulk_transfer_buf(us, 113 us->recv_bulk_pipe, 114 buffer, 0x24, NULL); 115 if (result != USB_STOR_XFER_GOOD) { 116 result = USB_STOR_XFER_ERROR; 117 goto out; 118 } 119 120 result = memcmp(buffer+8, "Option", 6); 121 122 if (result != 0) 123 result = memcmp(buffer+8, "ZCOPTION", 8); 124 125 /* Read the CSW */ 126 usb_stor_bulk_transfer_buf(us, 127 us->recv_bulk_pipe, 128 buffer, 13, NULL); 129 130out: 131 kfree(buffer); 132 return result; 133} 134 135 136int option_ms_init(struct us_data *us) 137{ 138 int result; 139 140 US_DEBUGP("Option MS: option_ms_init called\n"); 141 142 /* Additional test for vendor information via INQUIRY, 143 * because some vendor/product IDs are ambiguous 144 */ 145 result = option_inquiry(us); 146 if (result != 0) { 147 US_DEBUGP("Option MS: vendor is not Option or not determinable," 148 " no action taken\n"); 149 return 0; 150 } else 151 US_DEBUGP("Option MS: this is a genuine Option device," 152 " proceeding\n"); 153 154 /* Force Modem mode */ 155 if (option_zero_cd == ZCD_FORCE_MODEM) { 156 US_DEBUGP("Option MS: %s", "Forcing Modem Mode\n"); 157 result = option_rezero(us); 158 if (result != USB_STOR_XFER_GOOD) 159 US_DEBUGP("Option MS: Failed to switch to modem mode.\n"); 160 return -EIO; 161 } else if (option_zero_cd == ZCD_ALLOW_MS) { 162 /* Allow Mass Storage mode (keep CD-Rom) */ 163 US_DEBUGP("Option MS: %s", "Allowing Mass Storage Mode if device" 164 " requests it\n"); 165 } 166 167 return 0; 168} 169