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 #include <linux/module.h> 26 27 #include "usb.h" 28 #include "transport.h" 29 #include "option_ms.h" 30 #include "debug.h" 31 32 #define ZCD_FORCE_MODEM 0x01 33 #define ZCD_ALLOW_MS 0x02 34 35 static unsigned int option_zero_cd = ZCD_FORCE_MODEM; 36 module_param(option_zero_cd, uint, S_IRUGO | S_IWUSR); 37 MODULE_PARM_DESC(option_zero_cd, "ZeroCD mode (1=Force Modem (default)," 38 " 2=Allow CD-Rom"); 39 40 #define RESPONSE_LEN 1024 41 42 static int option_rezero(struct us_data *us) 43 { 44 const unsigned char rezero_msg[] = { 45 0x55, 0x53, 0x42, 0x43, 0x78, 0x56, 0x34, 0x12, 46 0x01, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x01, 47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 49 }; 50 char *buffer; 51 int result; 52 53 usb_stor_dbg(us, "Option MS: %s\n", "DEVICE MODE SWITCH"); 54 55 buffer = kzalloc(RESPONSE_LEN, GFP_KERNEL); 56 if (buffer == NULL) 57 return USB_STOR_TRANSPORT_ERROR; 58 59 memcpy(buffer, rezero_msg, sizeof(rezero_msg)); 60 result = usb_stor_bulk_transfer_buf(us, 61 us->send_bulk_pipe, 62 buffer, sizeof(rezero_msg), NULL); 63 if (result != USB_STOR_XFER_GOOD) { 64 result = USB_STOR_XFER_ERROR; 65 goto out; 66 } 67 68 /* Some of the devices need to be asked for a response, but we don't 69 * care what that response is. 70 */ 71 usb_stor_bulk_transfer_buf(us, 72 us->recv_bulk_pipe, 73 buffer, RESPONSE_LEN, NULL); 74 75 /* Read the CSW */ 76 usb_stor_bulk_transfer_buf(us, 77 us->recv_bulk_pipe, 78 buffer, 13, NULL); 79 80 result = USB_STOR_XFER_GOOD; 81 82 out: 83 kfree(buffer); 84 return result; 85 } 86 87 static int option_inquiry(struct us_data *us) 88 { 89 const unsigned char inquiry_msg[] = { 90 0x55, 0x53, 0x42, 0x43, 0x12, 0x34, 0x56, 0x78, 91 0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12, 92 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, 93 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 94 }; 95 char *buffer; 96 int result; 97 98 usb_stor_dbg(us, "Option MS: %s\n", "device inquiry for vendor name"); 99 100 buffer = kzalloc(0x24, GFP_KERNEL); 101 if (buffer == NULL) 102 return USB_STOR_TRANSPORT_ERROR; 103 104 memcpy(buffer, inquiry_msg, sizeof(inquiry_msg)); 105 result = usb_stor_bulk_transfer_buf(us, 106 us->send_bulk_pipe, 107 buffer, sizeof(inquiry_msg), NULL); 108 if (result != USB_STOR_XFER_GOOD) { 109 result = USB_STOR_XFER_ERROR; 110 goto out; 111 } 112 113 result = usb_stor_bulk_transfer_buf(us, 114 us->recv_bulk_pipe, 115 buffer, 0x24, NULL); 116 if (result != USB_STOR_XFER_GOOD) { 117 result = USB_STOR_XFER_ERROR; 118 goto out; 119 } 120 121 result = memcmp(buffer+8, "Option", 6); 122 123 if (result != 0) 124 result = memcmp(buffer+8, "ZCOPTION", 8); 125 126 /* Read the CSW */ 127 usb_stor_bulk_transfer_buf(us, 128 us->recv_bulk_pipe, 129 buffer, 13, NULL); 130 131 out: 132 kfree(buffer); 133 return result; 134 } 135 136 137 int option_ms_init(struct us_data *us) 138 { 139 int result; 140 141 usb_stor_dbg(us, "Option MS: %s\n", "option_ms_init called"); 142 143 /* Additional test for vendor information via INQUIRY, 144 * because some vendor/product IDs are ambiguous 145 */ 146 result = option_inquiry(us); 147 if (result != 0) { 148 usb_stor_dbg(us, "Option MS: %s\n", 149 "vendor is not Option or not determinable, no action taken"); 150 return 0; 151 } else 152 usb_stor_dbg(us, "Option MS: %s\n", 153 "this is a genuine Option device, proceeding"); 154 155 /* Force Modem mode */ 156 if (option_zero_cd == ZCD_FORCE_MODEM) { 157 usb_stor_dbg(us, "Option MS: %s\n", "Forcing Modem Mode"); 158 result = option_rezero(us); 159 if (result != USB_STOR_XFER_GOOD) 160 usb_stor_dbg(us, "Option MS: %s\n", 161 "Failed to switch to modem mode"); 162 return -EIO; 163 } else if (option_zero_cd == ZCD_ALLOW_MS) { 164 /* Allow Mass Storage mode (keep CD-Rom) */ 165 usb_stor_dbg(us, "Option MS: %s\n", 166 "Allowing Mass Storage Mode if device requests it"); 167 } 168 169 return 0; 170 } 171 172