David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Frontier Designs Alphatrack driver |
| 3 | * |
| 4 | * Copyright (C) 2007 Michael Taht (m@taht.net) |
| 5 | * |
| 6 | * Based on the usbled driver and ldusb drivers by |
| 7 | * |
| 8 | * Copyright (C) 2004 Greg Kroah-Hartman (greg@kroah.com) |
| 9 | * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> |
| 10 | * |
| 11 | * The ldusb driver was, in turn, derived from Lego USB Tower driver |
| 12 | * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> |
| 13 | * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License as |
| 17 | * published by the Free Software Foundation, version 2. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * This driver uses a ring buffer for time critical reading of |
| 23 | * interrupt in reports and provides read and write methods for |
| 24 | * raw interrupt reports. |
| 25 | */ |
| 26 | |
| 27 | /* Note: this currently uses a dumb ringbuffer for reads and writes. |
| 28 | * A more optimal driver would cache and kill off outstanding urbs that are |
| 29 | * now invalid, and ignore ones that already were in the queue but valid |
| 30 | * as we only have 30 commands for the alphatrack. In particular this is |
| 31 | * key for getting lights to flash in time as otherwise many commands |
| 32 | * can be buffered up before the light change makes it to the interface. |
| 33 | */ |
| 34 | |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/errno.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/kobject.h> |
| 41 | #include <linux/mutex.h> |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 42 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 43 | #include <linux/uaccess.h> |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 44 | #include <linux/input.h> |
| 45 | #include <linux/usb.h> |
| 46 | #include <linux/poll.h> |
| 47 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 48 | #include "alphatrack.h" |
| 49 | |
| 50 | #define VENDOR_ID 0x165b |
| 51 | #define PRODUCT_ID 0xfad1 |
| 52 | |
| 53 | #ifdef CONFIG_USB_DYNAMIC_MINORS |
| 54 | #define USB_ALPHATRACK_MINOR_BASE 0 |
| 55 | #else |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 56 | /* FIXME 176 - is another driver's minor - apply for that */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 57 | #define USB_ALPHATRACK_MINOR_BASE 176 |
| 58 | #endif |
| 59 | |
| 60 | /* table of devices that work with this driver */ |
Németh Márton | a457732 | 2010-01-10 00:18:34 +0100 | [diff] [blame] | 61 | static const struct usb_device_id usb_alphatrack_table[] = { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 62 | {USB_DEVICE(VENDOR_ID, PRODUCT_ID)}, |
| 63 | {} /* Terminating entry */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | MODULE_DEVICE_TABLE(usb, usb_alphatrack_table); |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 67 | MODULE_VERSION("0.41"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 68 | MODULE_AUTHOR("Mike Taht <m@taht.net>"); |
| 69 | MODULE_DESCRIPTION("Alphatrack USB Driver"); |
| 70 | MODULE_LICENSE("GPL"); |
| 71 | MODULE_SUPPORTED_DEVICE("Frontier Designs Alphatrack Control Surface"); |
| 72 | |
| 73 | /* These aren't done yet */ |
| 74 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 75 | #define SUPPRESS_EXTRA_ONLINE_EVENTS 0 |
| 76 | #define BUFFERED_WRITES 0 |
| 77 | #define SUPPRESS_EXTRA_OFFLINE_EVENTS 0 |
| 78 | #define COMPRESS_FADER_EVENTS 0 |
| 79 | |
| 80 | #define BUFFERED_READS 1 |
| 81 | #define RING_BUFFER_SIZE 512 |
| 82 | #define WRITE_BUFFER_SIZE 34 |
| 83 | #define ALPHATRACK_USB_TIMEOUT 10 |
| 84 | #define OUTPUT_CMD_SIZE 8 |
| 85 | #define INPUT_CMD_SIZE 12 |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 86 | #define ALPHATRACK_DEBUG 0 |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 87 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 88 | static int debug = ALPHATRACK_DEBUG; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 89 | |
| 90 | /* Use our own dbg macro */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 91 | #define dbg_info(dev, format, arg...) do \ |
Mauro Schilman | 9dd5f27 | 2010-11-01 14:12:05 -0300 | [diff] [blame] | 92 | { if (debug) dev_info(dev , format , ## arg); } while (0) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 93 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 94 | #define alphatrack_ocmd_info(dev, cmd, format, arg...) |
| 95 | |
| 96 | #define alphatrack_icmd_info(dev, cmd, format, arg...) |
| 97 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 98 | /* Module parameters */ |
| 99 | |
| 100 | module_param(debug, int, S_IRUGO | S_IWUSR); |
| 101 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |
| 102 | |
| 103 | /* All interrupt in transfers are collected in a ring buffer to |
| 104 | * avoid racing conditions and get better performance of the driver. |
| 105 | */ |
| 106 | |
| 107 | static int ring_buffer_size = RING_BUFFER_SIZE; |
| 108 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 109 | module_param(ring_buffer_size, int, S_IRUGO); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 110 | MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size"); |
| 111 | |
| 112 | /* The write_buffer can one day contain more than one interrupt out transfer. |
| 113 | */ |
| 114 | |
| 115 | static int write_buffer_size = WRITE_BUFFER_SIZE; |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 116 | module_param(write_buffer_size, int, S_IRUGO); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 117 | MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); |
| 118 | |
| 119 | /* |
| 120 | * Increase the interval for debugging purposes. |
| 121 | * or set to 1 to use the standard interval from the endpoint descriptors. |
| 122 | */ |
| 123 | |
| 124 | static int min_interrupt_in_interval = ALPHATRACK_USB_TIMEOUT; |
| 125 | module_param(min_interrupt_in_interval, int, 0); |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 126 | MODULE_PARM_DESC(min_interrupt_in_interval, |
| 127 | "Minimum interrupt in interval in ms"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 128 | |
| 129 | static int min_interrupt_out_interval = ALPHATRACK_USB_TIMEOUT; |
| 130 | module_param(min_interrupt_out_interval, int, 0); |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 131 | MODULE_PARM_DESC(min_interrupt_out_interval, |
| 132 | "Minimum interrupt out interval in ms"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 133 | |
| 134 | /* Structure to hold all of our device specific stuff */ |
| 135 | |
| 136 | struct usb_alphatrack { |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 137 | struct mutex mtx; /* locks this structure */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 138 | struct usb_interface *intf; /* save off the usb interface pointer */ |
| 139 | int open_count; /* number of times this port has been opened */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 140 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 141 | /* make gcc happy */ |
| 142 | struct alphatrack_icmd (*ring_buffer)[RING_BUFFER_SIZE]; |
| 143 | struct alphatrack_ocmd (*write_buffer)[WRITE_BUFFER_SIZE]; |
| 144 | unsigned int ring_head; |
| 145 | unsigned int ring_tail; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 146 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 147 | wait_queue_head_t read_wait; |
| 148 | wait_queue_head_t write_wait; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 149 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 150 | unsigned char *interrupt_in_buffer; |
| 151 | unsigned char *oldi_buffer; |
| 152 | struct usb_endpoint_descriptor *interrupt_in_endpoint; |
| 153 | struct urb *interrupt_in_urb; |
| 154 | int interrupt_in_interval; |
| 155 | size_t interrupt_in_endpoint_size; |
| 156 | int interrupt_in_running; |
| 157 | int interrupt_in_done; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 158 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 159 | char *interrupt_out_buffer; |
| 160 | struct usb_endpoint_descriptor *interrupt_out_endpoint; |
| 161 | struct urb *interrupt_out_urb; |
| 162 | int interrupt_out_interval; |
| 163 | size_t interrupt_out_endpoint_size; |
| 164 | int interrupt_out_busy; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 165 | |
| 166 | atomic_t writes_pending; |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 167 | int event; /* alternate interface to events */ |
| 168 | int fader; /* 10 bits */ |
| 169 | int lights; /* 23 bits */ |
| 170 | unsigned char dump_state; /* 0 if disabled 1 if enabled */ |
| 171 | unsigned char enable; /* 0 if disabled 1 if enabled */ |
| 172 | unsigned char offline; /* if the device is out of range or asleep */ |
| 173 | unsigned char verbose; /* be verbose in error reporting */ |
| 174 | unsigned char last_cmd[OUTPUT_CMD_SIZE]; |
| 175 | unsigned char screen[32]; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 176 | }; |
| 177 | |
| 178 | /* prevent races between open() and disconnect() */ |
| 179 | static DEFINE_MUTEX(disconnect_mutex); |
| 180 | |
| 181 | /* forward declaration */ |
| 182 | |
| 183 | static struct usb_driver usb_alphatrack_driver; |
| 184 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 185 | /** |
| 186 | * usb_alphatrack_abort_transfers |
| 187 | * aborts transfers and frees associated data structures |
| 188 | */ |
| 189 | static void usb_alphatrack_abort_transfers(struct usb_alphatrack *dev) |
| 190 | { |
| 191 | /* shutdown transfer */ |
| 192 | if (dev->interrupt_in_running) { |
| 193 | dev->interrupt_in_running = 0; |
| 194 | if (dev->intf) |
| 195 | usb_kill_urb(dev->interrupt_in_urb); |
| 196 | } |
| 197 | if (dev->interrupt_out_busy) |
| 198 | if (dev->intf) |
| 199 | usb_kill_urb(dev->interrupt_out_urb); |
| 200 | } |
| 201 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 202 | /** |
| 203 | * usb_alphatrack_delete |
| 204 | */ |
| 205 | static void usb_alphatrack_delete(struct usb_alphatrack *dev) |
| 206 | { |
| 207 | usb_alphatrack_abort_transfers(dev); |
| 208 | usb_free_urb(dev->interrupt_in_urb); |
| 209 | usb_free_urb(dev->interrupt_out_urb); |
| 210 | kfree(dev->ring_buffer); |
| 211 | kfree(dev->interrupt_in_buffer); |
| 212 | kfree(dev->interrupt_out_buffer); |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 213 | kfree(dev); /* fixme oldi_buffer */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | /** |
| 217 | * usb_alphatrack_interrupt_in_callback |
| 218 | */ |
| 219 | |
| 220 | static void usb_alphatrack_interrupt_in_callback(struct urb *urb) |
| 221 | { |
| 222 | struct usb_alphatrack *dev = urb->context; |
| 223 | unsigned int next_ring_head; |
| 224 | int retval = -1; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 225 | |
| 226 | if (urb->status) { |
| 227 | if (urb->status == -ENOENT || |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 228 | urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) { |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 229 | goto exit; |
| 230 | } else { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 231 | dbg_info(&dev->intf->dev, |
| 232 | "%s: nonzero status received: %d\n", __func__, |
| 233 | urb->status); |
| 234 | goto resubmit; /* maybe we can recover */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 235 | } |
| 236 | } |
| 237 | |
| 238 | if (urb->actual_length != INPUT_CMD_SIZE) { |
| 239 | dev_warn(&dev->intf->dev, |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 240 | "Urb length was %d bytes!!" |
Michael Tate | 1e1d25c | 2010-03-07 18:19:39 +0400 | [diff] [blame] | 241 | "Do something intelligent\n", urb->actual_length); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 242 | } else { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 243 | alphatrack_ocmd_info(&dev->intf->dev, |
| 244 | &(*dev->ring_buffer)[dev->ring_tail].cmd, |
| 245 | "%s", "bla"); |
| 246 | if (memcmp |
| 247 | (dev->interrupt_in_buffer, dev->oldi_buffer, |
| 248 | INPUT_CMD_SIZE) == 0) { |
| 249 | goto resubmit; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 250 | } |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 251 | memcpy(dev->oldi_buffer, dev->interrupt_in_buffer, |
| 252 | INPUT_CMD_SIZE); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 253 | |
| 254 | #if SUPPRESS_EXTRA_OFFLINE_EVENTS |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 255 | if (dev->offline == 2 && dev->interrupt_in_buffer[1] == 0xff) |
| 256 | goto resubmit; |
| 257 | if (dev->offline == 1 && dev->interrupt_in_buffer[1] == 0xff) { |
| 258 | dev->offline = 2; |
| 259 | goto resubmit; |
| 260 | } |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 261 | /* Always pass one offline event up the stack */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 262 | if (dev->offline > 0 && dev->interrupt_in_buffer[1] != 0xff) |
| 263 | dev->offline = 0; |
| 264 | if (dev->offline == 0 && dev->interrupt_in_buffer[1] == 0xff) |
| 265 | dev->offline = 1; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 266 | #endif |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 267 | dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", |
| 268 | __func__, dev->ring_head, dev->ring_tail); |
| 269 | next_ring_head = (dev->ring_head + 1) % ring_buffer_size; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 270 | |
| 271 | if (next_ring_head != dev->ring_tail) { |
| 272 | memcpy(&((*dev->ring_buffer)[dev->ring_head]), |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 273 | dev->interrupt_in_buffer, urb->actual_length); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 274 | dev->ring_head = next_ring_head; |
| 275 | retval = 0; |
| 276 | memset(dev->interrupt_in_buffer, 0, urb->actual_length); |
| 277 | } else { |
| 278 | dev_warn(&dev->intf->dev, |
| 279 | "Ring buffer overflow, %d bytes dropped\n", |
| 280 | urb->actual_length); |
| 281 | memset(dev->interrupt_in_buffer, 0, urb->actual_length); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | resubmit: |
| 286 | /* resubmit if we're still running */ |
| 287 | if (dev->interrupt_in_running && dev->intf) { |
| 288 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); |
| 289 | if (retval) |
| 290 | dev_err(&dev->intf->dev, |
| 291 | "usb_submit_urb failed (%d)\n", retval); |
| 292 | } |
| 293 | |
| 294 | exit: |
| 295 | dev->interrupt_in_done = 1; |
| 296 | wake_up_interruptible(&dev->read_wait); |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * usb_alphatrack_interrupt_out_callback |
| 301 | */ |
| 302 | static void usb_alphatrack_interrupt_out_callback(struct urb *urb) |
| 303 | { |
| 304 | struct usb_alphatrack *dev = urb->context; |
| 305 | |
| 306 | /* sync/async unlink faults aren't errors */ |
| 307 | if (urb->status && !(urb->status == -ENOENT || |
| 308 | urb->status == -ECONNRESET || |
| 309 | urb->status == -ESHUTDOWN)) |
| 310 | dbg_info(&dev->intf->dev, |
| 311 | "%s - nonzero write interrupt status received: %d\n", |
Harvey Harrison | d599edc | 2009-01-07 14:31:57 -0800 | [diff] [blame] | 312 | __func__, urb->status); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 313 | atomic_dec(&dev->writes_pending); |
| 314 | dev->interrupt_out_busy = 0; |
| 315 | wake_up_interruptible(&dev->write_wait); |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * usb_alphatrack_open |
| 320 | */ |
| 321 | static int usb_alphatrack_open(struct inode *inode, struct file *file) |
| 322 | { |
| 323 | struct usb_alphatrack *dev; |
| 324 | int subminor; |
| 325 | int retval = 0; |
| 326 | struct usb_interface *interface; |
| 327 | |
| 328 | nonseekable_open(inode, file); |
| 329 | subminor = iminor(inode); |
| 330 | |
| 331 | mutex_lock(&disconnect_mutex); |
| 332 | |
| 333 | interface = usb_find_interface(&usb_alphatrack_driver, subminor); |
| 334 | |
| 335 | if (!interface) { |
| 336 | err("%s - error, can't find device for minor %d\n", |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 337 | __func__, subminor); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 338 | retval = -ENODEV; |
| 339 | goto unlock_disconnect_exit; |
| 340 | } |
| 341 | |
| 342 | dev = usb_get_intfdata(interface); |
| 343 | |
| 344 | if (!dev) { |
| 345 | retval = -ENODEV; |
| 346 | goto unlock_disconnect_exit; |
| 347 | } |
| 348 | |
| 349 | /* lock this device */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 350 | if (mutex_lock_interruptible(&dev->mtx)) { |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 351 | retval = -ERESTARTSYS; |
| 352 | goto unlock_disconnect_exit; |
| 353 | } |
| 354 | |
| 355 | /* allow opening only once */ |
| 356 | if (dev->open_count) { |
| 357 | retval = -EBUSY; |
| 358 | goto unlock_exit; |
| 359 | } |
| 360 | dev->open_count = 1; |
| 361 | |
| 362 | /* initialize in direction */ |
| 363 | dev->ring_head = 0; |
| 364 | dev->ring_tail = 0; |
| 365 | usb_fill_int_urb(dev->interrupt_in_urb, |
| 366 | interface_to_usbdev(interface), |
| 367 | usb_rcvintpipe(interface_to_usbdev(interface), |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 368 | dev->interrupt_in_endpoint-> |
| 369 | bEndpointAddress), |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 370 | dev->interrupt_in_buffer, |
| 371 | dev->interrupt_in_endpoint_size, |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 372 | usb_alphatrack_interrupt_in_callback, dev, |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 373 | dev->interrupt_in_interval); |
| 374 | |
| 375 | dev->interrupt_in_running = 1; |
| 376 | dev->interrupt_in_done = 0; |
| 377 | dev->enable = 1; |
| 378 | dev->offline = 0; |
| 379 | |
| 380 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); |
| 381 | if (retval) { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 382 | dev_err(&interface->dev, |
| 383 | "Couldn't submit interrupt_in_urb %d\n", retval); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 384 | dev->interrupt_in_running = 0; |
| 385 | dev->open_count = 0; |
| 386 | goto unlock_exit; |
| 387 | } |
| 388 | |
| 389 | /* save device in the file's private structure */ |
| 390 | file->private_data = dev; |
| 391 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 392 | unlock_exit: |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 393 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 394 | |
| 395 | unlock_disconnect_exit: |
| 396 | mutex_unlock(&disconnect_mutex); |
| 397 | |
| 398 | return retval; |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * usb_alphatrack_release |
| 403 | */ |
| 404 | static int usb_alphatrack_release(struct inode *inode, struct file *file) |
| 405 | { |
| 406 | struct usb_alphatrack *dev; |
| 407 | int retval = 0; |
| 408 | |
| 409 | dev = file->private_data; |
| 410 | |
| 411 | if (dev == NULL) { |
| 412 | retval = -ENODEV; |
| 413 | goto exit; |
| 414 | } |
| 415 | |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 416 | if (mutex_lock_interruptible(&dev->mtx)) { |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 417 | retval = -ERESTARTSYS; |
| 418 | goto exit; |
| 419 | } |
| 420 | |
| 421 | if (dev->open_count != 1) { |
| 422 | retval = -ENODEV; |
| 423 | goto unlock_exit; |
| 424 | } |
| 425 | |
| 426 | if (dev->intf == NULL) { |
| 427 | /* the device was unplugged before the file was released */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 428 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 429 | /* unlock here as usb_alphatrack_delete frees dev */ |
| 430 | usb_alphatrack_delete(dev); |
| 431 | retval = -ENODEV; |
| 432 | goto exit; |
| 433 | } |
| 434 | |
| 435 | /* wait until write transfer is finished */ |
| 436 | if (dev->interrupt_out_busy) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 437 | wait_event_interruptible_timeout(dev->write_wait, |
| 438 | !dev->interrupt_out_busy, |
| 439 | 2 * HZ); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 440 | usb_alphatrack_abort_transfers(dev); |
| 441 | dev->open_count = 0; |
| 442 | |
| 443 | unlock_exit: |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 444 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 445 | |
| 446 | exit: |
| 447 | return retval; |
| 448 | } |
| 449 | |
| 450 | /** |
| 451 | * usb_alphatrack_poll |
| 452 | */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 453 | static unsigned int usb_alphatrack_poll(struct file *file, poll_table * wait) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 454 | { |
| 455 | struct usb_alphatrack *dev; |
| 456 | unsigned int mask = 0; |
| 457 | |
| 458 | dev = file->private_data; |
| 459 | |
| 460 | poll_wait(file, &dev->read_wait, wait); |
| 461 | poll_wait(file, &dev->write_wait, wait); |
| 462 | |
| 463 | if (dev->ring_head != dev->ring_tail) |
| 464 | mask |= POLLIN | POLLRDNORM; |
| 465 | if (!dev->interrupt_out_busy) |
| 466 | mask |= POLLOUT | POLLWRNORM; |
| 467 | |
| 468 | return mask; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * usb_alphatrack_read |
| 473 | */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 474 | static ssize_t usb_alphatrack_read(struct file *file, char __user *buffer, |
| 475 | size_t count, loff_t *ppos) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 476 | { |
| 477 | struct usb_alphatrack *dev; |
| 478 | int retval = 0; |
| 479 | |
| 480 | int c = 0; |
| 481 | |
| 482 | dev = file->private_data; |
| 483 | |
| 484 | /* verify that we actually have some data to read */ |
| 485 | if (count == 0) |
| 486 | goto exit; |
| 487 | |
| 488 | /* lock this object */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 489 | if (mutex_lock_interruptible(&dev->mtx)) { |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 490 | retval = -ERESTARTSYS; |
| 491 | goto exit; |
| 492 | } |
| 493 | |
| 494 | /* verify that the device wasn't unplugged */ |
| 495 | if (dev->intf == NULL) { |
| 496 | retval = -ENODEV; |
| 497 | err("No device or device unplugged %d\n", retval); |
| 498 | goto unlock_exit; |
| 499 | } |
| 500 | |
| 501 | while (dev->ring_head == dev->ring_tail) { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 502 | if (file->f_flags & O_NONBLOCK) { |
| 503 | retval = -EAGAIN; |
| 504 | goto unlock_exit; |
| 505 | } |
| 506 | dev->interrupt_in_done = 0; |
| 507 | retval = |
| 508 | wait_event_interruptible(dev->read_wait, |
| 509 | dev->interrupt_in_done); |
| 510 | if (retval < 0) |
| 511 | goto unlock_exit; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 512 | } |
| 513 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 514 | alphatrack_ocmd_info(&dev->intf->dev, |
| 515 | &(*dev->ring_buffer)[dev->ring_tail].cmd, "%s", |
| 516 | ": copying to userspace"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 517 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 518 | c = 0; |
| 519 | while ((c < count) && (dev->ring_tail != dev->ring_head)) { |
| 520 | if (copy_to_user |
| 521 | (&buffer[c], &(*dev->ring_buffer)[dev->ring_tail], |
| 522 | INPUT_CMD_SIZE)) { |
| 523 | retval = -EFAULT; |
| 524 | goto unlock_exit; |
| 525 | } |
| 526 | dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; |
| 527 | c += INPUT_CMD_SIZE; |
| 528 | dbg_info(&dev->intf->dev, "%s: head, tail are %x, %x\n", |
| 529 | __func__, dev->ring_head, dev->ring_tail); |
| 530 | } |
| 531 | retval = c; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 532 | |
| 533 | unlock_exit: |
| 534 | /* unlock the device */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 535 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 536 | |
| 537 | exit: |
| 538 | return retval; |
| 539 | } |
| 540 | |
| 541 | /** |
| 542 | * usb_alphatrack_write |
| 543 | */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 544 | static ssize_t usb_alphatrack_write(struct file *file, |
| 545 | const char __user *buffer, size_t count, |
| 546 | loff_t *ppos) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 547 | { |
| 548 | struct usb_alphatrack *dev; |
| 549 | size_t bytes_to_write; |
| 550 | int retval = 0; |
| 551 | |
| 552 | dev = file->private_data; |
| 553 | |
| 554 | /* verify that we actually have some data to write */ |
| 555 | if (count == 0) |
| 556 | goto exit; |
| 557 | |
| 558 | /* lock this object */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 559 | if (mutex_lock_interruptible(&dev->mtx)) { |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 560 | retval = -ERESTARTSYS; |
| 561 | goto exit; |
| 562 | } |
| 563 | |
| 564 | /* verify that the device wasn't unplugged */ |
| 565 | if (dev->intf == NULL) { |
| 566 | retval = -ENODEV; |
| 567 | err("No device or device unplugged %d\n", retval); |
| 568 | goto unlock_exit; |
| 569 | } |
| 570 | |
| 571 | /* wait until previous transfer is finished */ |
| 572 | if (dev->interrupt_out_busy) { |
| 573 | if (file->f_flags & O_NONBLOCK) { |
| 574 | retval = -EAGAIN; |
| 575 | goto unlock_exit; |
| 576 | } |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 577 | retval = |
| 578 | wait_event_interruptible(dev->write_wait, |
| 579 | !dev->interrupt_out_busy); |
| 580 | if (retval < 0) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 581 | goto unlock_exit; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | /* write the data into interrupt_out_buffer from userspace */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 585 | /* FIXME - if you write more than 12 bytes this breaks */ |
| 586 | bytes_to_write = |
| 587 | min(count, write_buffer_size * dev->interrupt_out_endpoint_size); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 588 | if (bytes_to_write < count) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 589 | dev_warn(&dev->intf->dev, |
| 590 | "Write buffer overflow, %zd bytes dropped\n", |
| 591 | count - bytes_to_write); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 592 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 593 | dbg_info(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", |
| 594 | __func__, count, bytes_to_write); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 595 | |
| 596 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { |
| 597 | retval = -EFAULT; |
| 598 | goto unlock_exit; |
| 599 | } |
| 600 | |
| 601 | if (dev->interrupt_out_endpoint == NULL) { |
Michael Tate | 1e1d25c | 2010-03-07 18:19:39 +0400 | [diff] [blame] | 602 | err("Endpoint should not be be null!\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 603 | goto unlock_exit; |
| 604 | } |
| 605 | |
| 606 | /* send off the urb */ |
| 607 | usb_fill_int_urb(dev->interrupt_out_urb, |
| 608 | interface_to_usbdev(dev->intf), |
| 609 | usb_sndintpipe(interface_to_usbdev(dev->intf), |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 610 | dev->interrupt_out_endpoint-> |
| 611 | bEndpointAddress), |
| 612 | dev->interrupt_out_buffer, bytes_to_write, |
| 613 | usb_alphatrack_interrupt_out_callback, dev, |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 614 | dev->interrupt_out_interval); |
| 615 | dev->interrupt_out_busy = 1; |
| 616 | atomic_inc(&dev->writes_pending); |
| 617 | wmb(); |
| 618 | |
| 619 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); |
| 620 | if (retval) { |
| 621 | dev->interrupt_out_busy = 0; |
| 622 | err("Couldn't submit interrupt_out_urb %d\n", retval); |
| 623 | atomic_dec(&dev->writes_pending); |
| 624 | goto unlock_exit; |
| 625 | } |
| 626 | retval = bytes_to_write; |
| 627 | |
| 628 | unlock_exit: |
| 629 | /* unlock the device */ |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 630 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 631 | |
| 632 | exit: |
| 633 | return retval; |
| 634 | } |
| 635 | |
| 636 | /* file operations needed when we register this driver */ |
| 637 | static const struct file_operations usb_alphatrack_fops = { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 638 | .owner = THIS_MODULE, |
| 639 | .read = usb_alphatrack_read, |
| 640 | .write = usb_alphatrack_write, |
| 641 | .open = usb_alphatrack_open, |
| 642 | .release = usb_alphatrack_release, |
| 643 | .poll = usb_alphatrack_poll, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 644 | .llseek = no_llseek, |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 645 | }; |
| 646 | |
| 647 | /* |
| 648 | * usb class driver info in order to get a minor number from the usb core, |
| 649 | * and to have the device registered with the driver core |
| 650 | */ |
| 651 | |
| 652 | static struct usb_class_driver usb_alphatrack_class = { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 653 | .name = "alphatrack%d", |
| 654 | .fops = &usb_alphatrack_fops, |
| 655 | .minor_base = USB_ALPHATRACK_MINOR_BASE, |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 656 | }; |
| 657 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 658 | /** |
| 659 | * usb_alphatrack_probe |
| 660 | * |
| 661 | * Called by the usb core when a new device is connected that it thinks |
| 662 | * this driver might be interested in. |
| 663 | */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 664 | static int usb_alphatrack_probe(struct usb_interface *intf, |
| 665 | const struct usb_device_id *id) |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 666 | { |
| 667 | struct usb_device *udev = interface_to_usbdev(intf); |
| 668 | struct usb_alphatrack *dev = NULL; |
| 669 | struct usb_host_interface *iface_desc; |
| 670 | struct usb_endpoint_descriptor *endpoint; |
| 671 | int i; |
| 672 | int true_size; |
| 673 | int retval = -ENOMEM; |
| 674 | |
Uwe Kleine-König | 9b0131c | 2010-09-01 15:40:25 +0200 | [diff] [blame] | 675 | /* allocate memory for our device state and initialize it */ |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 676 | |
| 677 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 678 | if (dev == NULL) { |
| 679 | dev_err(&intf->dev, "Out of memory\n"); |
| 680 | goto exit; |
| 681 | } |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 682 | mutex_init(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 683 | dev->intf = intf; |
| 684 | init_waitqueue_head(&dev->read_wait); |
| 685 | init_waitqueue_head(&dev->write_wait); |
| 686 | |
| 687 | iface_desc = intf->cur_altsetting; |
| 688 | |
| 689 | /* set up the endpoint information */ |
| 690 | for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| 691 | endpoint = &iface_desc->endpoint[i].desc; |
| 692 | |
| 693 | if (usb_endpoint_is_int_in(endpoint)) |
| 694 | dev->interrupt_in_endpoint = endpoint; |
| 695 | |
| 696 | if (usb_endpoint_is_int_out(endpoint)) |
| 697 | dev->interrupt_out_endpoint = endpoint; |
| 698 | } |
| 699 | if (dev->interrupt_in_endpoint == NULL) { |
| 700 | dev_err(&intf->dev, "Interrupt in endpoint not found\n"); |
| 701 | goto error; |
| 702 | } |
| 703 | if (dev->interrupt_out_endpoint == NULL) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 704 | dev_warn(&intf->dev, |
| 705 | "Interrupt out endpoint not found" |
| 706 | "(using control endpoint instead)\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 707 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 708 | dev->interrupt_in_endpoint_size = |
| 709 | le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 710 | |
| 711 | if (dev->interrupt_in_endpoint_size != 64) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 712 | dev_warn(&intf->dev, "Interrupt in endpoint size is not 64!\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 713 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 714 | if (ring_buffer_size == 0) |
| 715 | ring_buffer_size = RING_BUFFER_SIZE; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 716 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 717 | true_size = min(ring_buffer_size, RING_BUFFER_SIZE); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 718 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 719 | /* FIXME - there are more usb_alloc routines for dma correctness. |
| 720 | Needed? */ |
| 721 | dev->ring_buffer = |
| 722 | kmalloc((true_size * sizeof(struct alphatrack_icmd)), GFP_KERNEL); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 723 | |
| 724 | if (!dev->ring_buffer) { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 725 | dev_err(&intf->dev, |
| 726 | "Couldn't allocate input ring_buffer of size %d\n", |
| 727 | true_size); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 728 | goto error; |
| 729 | } |
| 730 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 731 | dev->interrupt_in_buffer = |
| 732 | kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 733 | |
| 734 | if (!dev->interrupt_in_buffer) { |
| 735 | dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); |
| 736 | goto error; |
| 737 | } |
| 738 | dev->oldi_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
| 739 | if (!dev->oldi_buffer) { |
| 740 | dev_err(&intf->dev, "Couldn't allocate old buffer\n"); |
| 741 | goto error; |
| 742 | } |
| 743 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 744 | if (!dev->interrupt_in_urb) { |
| 745 | dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n"); |
| 746 | goto error; |
| 747 | } |
| 748 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 749 | dev->interrupt_out_endpoint_size = |
| 750 | dev->interrupt_out_endpoint ? le16_to_cpu(dev-> |
| 751 | interrupt_out_endpoint-> |
| 752 | wMaxPacketSize) : udev-> |
| 753 | descriptor.bMaxPacketSize0; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 754 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 755 | if (dev->interrupt_out_endpoint_size != 64) |
| 756 | dev_warn(&intf->dev, |
| 757 | "Interrupt out endpoint size is not 64!)\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 758 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 759 | if (write_buffer_size == 0) |
| 760 | write_buffer_size = WRITE_BUFFER_SIZE; |
| 761 | true_size = min(write_buffer_size, WRITE_BUFFER_SIZE); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 762 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 763 | dev->interrupt_out_buffer = |
| 764 | kmalloc(true_size * dev->interrupt_out_endpoint_size, GFP_KERNEL); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 765 | |
| 766 | if (!dev->interrupt_out_buffer) { |
| 767 | dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); |
| 768 | goto error; |
| 769 | } |
| 770 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 771 | dev->write_buffer = |
Mauro Schilman | 9dd5f27 | 2010-11-01 14:12:05 -0300 | [diff] [blame] | 772 | kmalloc(true_size * sizeof(struct alphatrack_ocmd), GFP_KERNEL); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 773 | |
| 774 | if (!dev->write_buffer) { |
Michael Tate | 1e1d25c | 2010-03-07 18:19:39 +0400 | [diff] [blame] | 775 | dev_err(&intf->dev, "Couldn't allocate write_buffer\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 776 | goto error; |
| 777 | } |
| 778 | |
| 779 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 780 | if (!dev->interrupt_out_urb) { |
| 781 | dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n"); |
| 782 | goto error; |
| 783 | } |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 784 | dev->interrupt_in_interval = |
| 785 | min_interrupt_in_interval > |
| 786 | dev->interrupt_in_endpoint-> |
| 787 | bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint-> |
| 788 | bInterval; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 789 | if (dev->interrupt_out_endpoint) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 790 | dev->interrupt_out_interval = |
| 791 | min_interrupt_out_interval > |
| 792 | dev->interrupt_out_endpoint-> |
| 793 | bInterval ? min_interrupt_out_interval : dev-> |
| 794 | interrupt_out_endpoint->bInterval; |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 795 | |
| 796 | /* we can register the device now, as it is ready */ |
| 797 | usb_set_intfdata(intf, dev); |
| 798 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 799 | atomic_set(&dev->writes_pending, 0); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 800 | retval = usb_register_dev(intf, &usb_alphatrack_class); |
| 801 | if (retval) { |
| 802 | /* something prevented us from registering this driver */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 803 | dev_err(&intf->dev, |
| 804 | "Not able to get a minor for this device.\n"); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 805 | usb_set_intfdata(intf, NULL); |
| 806 | goto error; |
| 807 | } |
| 808 | |
| 809 | /* let the user know what node this device is now attached to */ |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 810 | dev_info(&intf->dev, |
| 811 | "Alphatrack Device #%d now attached to major %d minor %d\n", |
| 812 | (intf->minor - USB_ALPHATRACK_MINOR_BASE), USB_MAJOR, |
| 813 | intf->minor); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 814 | |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 815 | exit: |
| 816 | return retval; |
| 817 | |
| 818 | error: |
| 819 | usb_alphatrack_delete(dev); |
| 820 | |
| 821 | return retval; |
| 822 | } |
| 823 | |
| 824 | /** |
| 825 | * usb_alphatrack_disconnect |
| 826 | * |
| 827 | * Called by the usb core when the device is removed from the system. |
| 828 | */ |
| 829 | static void usb_alphatrack_disconnect(struct usb_interface *intf) |
| 830 | { |
| 831 | struct usb_alphatrack *dev; |
| 832 | int minor; |
| 833 | |
| 834 | mutex_lock(&disconnect_mutex); |
| 835 | |
| 836 | dev = usb_get_intfdata(intf); |
| 837 | usb_set_intfdata(intf, NULL); |
| 838 | |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 839 | mutex_lock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 840 | |
| 841 | minor = intf->minor; |
| 842 | |
| 843 | /* give back our minor */ |
| 844 | usb_deregister_dev(intf, &usb_alphatrack_class); |
| 845 | |
| 846 | /* if the device is not opened, then we clean up right now */ |
| 847 | if (!dev->open_count) { |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 848 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 849 | usb_alphatrack_delete(dev); |
| 850 | } else { |
| 851 | dev->intf = NULL; |
Eli Lindsey | 3504e0c | 2010-03-09 00:15:33 -0600 | [diff] [blame] | 852 | mutex_unlock(&dev->mtx); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 853 | } |
| 854 | |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 855 | atomic_set(&dev->writes_pending, 0); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 856 | mutex_unlock(&disconnect_mutex); |
| 857 | |
| 858 | dev_info(&intf->dev, "Alphatrack Surface #%d now disconnected\n", |
| 859 | (minor - USB_ALPHATRACK_MINOR_BASE)); |
| 860 | } |
| 861 | |
| 862 | /* usb specific object needed to register this driver with the usb subsystem */ |
| 863 | static struct usb_driver usb_alphatrack_driver = { |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 864 | .name = "alphatrack", |
| 865 | .probe = usb_alphatrack_probe, |
| 866 | .disconnect = usb_alphatrack_disconnect, |
| 867 | .id_table = usb_alphatrack_table, |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 868 | }; |
| 869 | |
| 870 | /** |
| 871 | * usb_alphatrack_init |
| 872 | */ |
| 873 | static int __init usb_alphatrack_init(void) |
| 874 | { |
| 875 | int retval; |
| 876 | |
| 877 | /* register this driver with the USB subsystem */ |
| 878 | retval = usb_register(&usb_alphatrack_driver); |
| 879 | if (retval) |
David Täht | f6a0cca | 2009-01-20 08:33:21 -0600 | [diff] [blame] | 880 | err("usb_register failed for the " __FILE__ |
| 881 | " driver. Error number %d\n", retval); |
David Taht | 8da3dc2 | 2008-12-17 17:13:45 -0800 | [diff] [blame] | 882 | |
| 883 | return retval; |
| 884 | } |
| 885 | |
| 886 | /** |
| 887 | * usb_alphatrack_exit |
| 888 | */ |
| 889 | static void __exit usb_alphatrack_exit(void) |
| 890 | { |
| 891 | /* deregister this driver with the USB subsystem */ |
| 892 | usb_deregister(&usb_alphatrack_driver); |
| 893 | } |
| 894 | |
| 895 | module_init(usb_alphatrack_init); |
| 896 | module_exit(usb_alphatrack_exit); |