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 25 #include "usb.h" 26 #include "transport.h" 27 #include "option_ms.h" 28 #include "debug.h" 29 30 #define ZCD_FORCE_MODEM 0x01 31 #define ZCD_ALLOW_MS 0x02 32 33 static unsigned int option_zero_cd = ZCD_FORCE_MODEM; 34 module_param(option_zero_cd, uint, S_IRUGO | S_IWUSR); 35 MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default)," 36 " 2=Allow CD-Rom"); 37 38 #define RESPONSE_LEN 1024 39 40 static int option_rezero(struct us_data *us) 41 { 42 const unsigned char rezero_msg[] = { 43 0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12, 44 0x01, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x01, 45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 47 }; 48 char *buffer; 49 int result; 50 51 US_DEBUGP("Option MS: %s", "DEVICE MODE SWITCH\n"); 52 53 buffer = kzalloc(RESPONSE_LEN, GFP_KERNEL); 54 if (buffer == NULL) 55 return USB_STOR_TRANSPORT_ERROR; 56 57 memcpy(buffer, rezero_msg, sizeof(rezero_msg)); 58 result = usb_stor_bulk_transfer_buf(us, 59 us->send_bulk_pipe, 60 buffer, sizeof(rezero_msg), NULL); 61 if (result != USB_STOR_XFER_GOOD) { 62 result = USB_STOR_XFER_ERROR; 63 goto out; 64 } 65 66 /* Some of the devices need to be asked for a response, but we don't 67 * care what that response is. 68 */ 69 usb_stor_bulk_transfer_buf(us, 70 us->recv_bulk_pipe, 71 buffer, RESPONSE_LEN, NULL); 72 73 /* Read the CSW */ 74 usb_stor_bulk_transfer_buf(us, 75 us->recv_bulk_pipe, 76 buffer, 13, NULL); 77 78 result = USB_STOR_XFER_GOOD; 79 80 out: 81 kfree(buffer); 82 return result; 83 } 84 85 static int option_inquiry(struct us_data *us) 86 { 87 const unsigned char inquiry_msg[] = { 88 0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78, 89 0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12, 90 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, 91 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 92 }; 93 char *buffer; 94 int result; 95 96 US_DEBUGP("Option MS: %s", "device inquiry for vendor name\n"); 97 98 buffer = kzalloc(0x24, GFP_KERNEL); 99 if (buffer == NULL) 100 return USB_STOR_TRANSPORT_ERROR; 101 102 memcpy(buffer, inquiry_msg, sizeof(inquiry_msg)); 103 result = usb_stor_bulk_transfer_buf(us, 104 us->send_bulk_pipe, 105 buffer, sizeof(inquiry_msg), NULL); 106 if (result != USB_STOR_XFER_GOOD) { 107 result = USB_STOR_XFER_ERROR; 108 goto out; 109 } 110 111 result = usb_stor_bulk_transfer_buf(us, 112 us->recv_bulk_pipe, 113 buffer, 0x24, NULL); 114 if (result != USB_STOR_XFER_GOOD) { 115 result = USB_STOR_XFER_ERROR; 116 goto out; 117 } 118 119 result = memcmp(buffer+8, "Option", 6); 120 121 if (result != 0) 122 result = memcmp(buffer+8, "ZCOPTION", 8); 123 124 /* Read the CSW */ 125 usb_stor_bulk_transfer_buf(us, 126 us->recv_bulk_pipe, 127 buffer, 13, NULL); 128 129 out: 130 kfree(buffer); 131 return result; 132 } 133 134 135 int option_ms_init(struct us_data *us) 136 { 137 int result; 138 139 US_DEBUGP("Option MS: option_ms_init called\n"); 140 141 /* Additional test for vendor information via INQUIRY, 142 * because some vendor/product IDs are ambiguous 143 */ 144 result = option_inquiry(us); 145 if (result != 0) { 146 US_DEBUGP("Option MS: vendor is not Option or not determinable," 147 " no action taken\n"); 148 return 0; 149 } else 150 US_DEBUGP("Option MS: this is a genuine Option device," 151 " proceeding\n"); 152 153 /* Force Modem mode */ 154 if (option_zero_cd == ZCD_FORCE_MODEM) { 155 US_DEBUGP("Option MS: %s", "Forcing Modem Mode\n"); 156 result = option_rezero(us); 157 if (result != USB_STOR_XFER_GOOD) 158 US_DEBUGP("Option MS: Failed to switch to modem mode.\n"); 159 return -EIO; 160 } else if (option_zero_cd == ZCD_ALLOW_MS) { 161 /* Allow Mass Storage mode (keep CD-Rom) */ 162 US_DEBUGP("Option MS: %s", "Allowing Mass Storage Mode if device" 163 " requests it\n"); 164 } 165 166 return 0; 167 } 168 169