Adrian Bunk | 612de10 | 2008-10-15 22:04:33 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Parallel-port resource manager code. |
| 3 | * |
| 4 | * Authors: David Campbell <campbell@tirian.che.curtin.edu.au> |
| 5 | * Tim Waugh <tim@cyberelk.demon.co.uk> |
| 6 | * Jose Renau <renau@acm.org> |
| 7 | * Philip Blundell <philb@gnu.org> |
| 8 | * Andrea Arcangeli |
| 9 | * |
| 10 | * based on work by Grant Guenther <grant@torque.net> |
| 11 | * and Philip Blundell |
| 12 | * |
| 13 | * Any part of this program may be used in documents licensed under |
| 14 | * the GNU Free Documentation License, Version 1.1 or any later version |
| 15 | * published by the Free Software Foundation. |
| 16 | */ |
| 17 | |
| 18 | #undef PARPORT_DEBUG_SHARING /* undef for production */ |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/threads.h> |
| 23 | #include <linux/parport.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/ioport.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/kmod.h> |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 32 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #include <linux/spinlock.h> |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 35 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/irq.h> |
| 37 | |
| 38 | #undef PARPORT_PARANOID |
| 39 | |
| 40 | #define PARPORT_DEFAULT_TIMESLICE (HZ/5) |
| 41 | |
| 42 | unsigned long parport_default_timeslice = PARPORT_DEFAULT_TIMESLICE; |
| 43 | int parport_default_spintime = DEFAULT_SPIN_TIME; |
| 44 | |
| 45 | static LIST_HEAD(portlist); |
| 46 | static DEFINE_SPINLOCK(parportlist_lock); |
| 47 | |
| 48 | /* list of all allocated ports, sorted by ->number */ |
| 49 | static LIST_HEAD(all_ports); |
| 50 | static DEFINE_SPINLOCK(full_list_lock); |
| 51 | |
| 52 | static LIST_HEAD(drivers); |
| 53 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 54 | static DEFINE_MUTEX(registration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | /* What you can do to a port that's gone away.. */ |
| 57 | static void dead_write_lines (struct parport *p, unsigned char b){} |
| 58 | static unsigned char dead_read_lines (struct parport *p) { return 0; } |
| 59 | static unsigned char dead_frob_lines (struct parport *p, unsigned char b, |
| 60 | unsigned char c) { return 0; } |
| 61 | static void dead_onearg (struct parport *p){} |
| 62 | static void dead_initstate (struct pardevice *d, struct parport_state *s) { } |
| 63 | static void dead_state (struct parport *p, struct parport_state *s) { } |
| 64 | static size_t dead_write (struct parport *p, const void *b, size_t l, int f) |
| 65 | { return 0; } |
| 66 | static size_t dead_read (struct parport *p, void *b, size_t l, int f) |
| 67 | { return 0; } |
| 68 | static struct parport_operations dead_ops = { |
| 69 | .write_data = dead_write_lines, /* data */ |
| 70 | .read_data = dead_read_lines, |
| 71 | |
| 72 | .write_control = dead_write_lines, /* control */ |
| 73 | .read_control = dead_read_lines, |
| 74 | .frob_control = dead_frob_lines, |
| 75 | |
| 76 | .read_status = dead_read_lines, /* status */ |
| 77 | |
| 78 | .enable_irq = dead_onearg, /* enable_irq */ |
| 79 | .disable_irq = dead_onearg, /* disable_irq */ |
| 80 | |
| 81 | .data_forward = dead_onearg, /* data_forward */ |
| 82 | .data_reverse = dead_onearg, /* data_reverse */ |
| 83 | |
| 84 | .init_state = dead_initstate, /* init_state */ |
| 85 | .save_state = dead_state, |
| 86 | .restore_state = dead_state, |
| 87 | |
| 88 | .epp_write_data = dead_write, /* epp */ |
| 89 | .epp_read_data = dead_read, |
| 90 | .epp_write_addr = dead_write, |
| 91 | .epp_read_addr = dead_read, |
| 92 | |
| 93 | .ecp_write_data = dead_write, /* ecp */ |
| 94 | .ecp_read_data = dead_read, |
| 95 | .ecp_write_addr = dead_write, |
| 96 | |
| 97 | .compat_write_data = dead_write, /* compat */ |
| 98 | .nibble_read_data = dead_read, /* nibble */ |
| 99 | .byte_read_data = dead_read, /* byte */ |
| 100 | |
| 101 | .owner = NULL, |
| 102 | }; |
| 103 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 104 | static struct device_type parport_device_type = { |
| 105 | .name = "parport", |
| 106 | }; |
| 107 | |
| 108 | static int is_parport(struct device *dev) |
| 109 | { |
| 110 | return dev->type == &parport_device_type; |
| 111 | } |
| 112 | |
| 113 | static int parport_probe(struct device *dev) |
| 114 | { |
| 115 | struct parport_driver *drv; |
| 116 | |
| 117 | if (is_parport(dev)) |
| 118 | return -ENODEV; |
| 119 | |
| 120 | drv = to_parport_driver(dev->driver); |
| 121 | if (!drv->probe) { |
| 122 | /* if driver has not defined a custom probe */ |
| 123 | struct pardevice *par_dev = to_pardevice(dev); |
| 124 | |
| 125 | if (strcmp(par_dev->name, drv->name)) |
| 126 | return -ENODEV; |
| 127 | return 0; |
| 128 | } |
| 129 | /* if driver defined its own probe */ |
| 130 | return drv->probe(to_pardevice(dev)); |
| 131 | } |
| 132 | |
| 133 | static struct bus_type parport_bus_type = { |
| 134 | .name = "parport", |
| 135 | .probe = parport_probe, |
| 136 | }; |
| 137 | |
| 138 | int parport_bus_init(void) |
| 139 | { |
| 140 | return bus_register(&parport_bus_type); |
| 141 | } |
| 142 | |
| 143 | void parport_bus_exit(void) |
| 144 | { |
| 145 | bus_unregister(&parport_bus_type); |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * iterates through all the drivers registered with the bus and sends the port |
| 150 | * details to the match_port callback of the driver, so that the driver can |
| 151 | * know about the new port that just regsitered with the bus and decide if it |
| 152 | * wants to use this new port. |
| 153 | */ |
| 154 | static int driver_check(struct device_driver *dev_drv, void *_port) |
| 155 | { |
| 156 | struct parport *port = _port; |
| 157 | struct parport_driver *drv = to_parport_driver(dev_drv); |
| 158 | |
| 159 | if (drv->match_port) |
| 160 | drv->match_port(port); |
| 161 | return 0; |
| 162 | } |
| 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | /* Call attach(port) for each registered driver. */ |
| 165 | static void attach_driver_chain(struct parport *port) |
| 166 | { |
| 167 | /* caller has exclusive registration_lock */ |
| 168 | struct parport_driver *drv; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | list_for_each_entry(drv, &drivers, list) |
| 171 | drv->attach(port); |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 172 | |
| 173 | /* |
| 174 | * call the driver_check function of the drivers registered in |
| 175 | * new device model |
| 176 | */ |
| 177 | |
| 178 | bus_for_each_drv(&parport_bus_type, NULL, port, driver_check); |
| 179 | } |
| 180 | |
| 181 | static int driver_detach(struct device_driver *_drv, void *_port) |
| 182 | { |
| 183 | struct parport *port = _port; |
| 184 | struct parport_driver *drv = to_parport_driver(_drv); |
| 185 | |
| 186 | if (drv->detach) |
| 187 | drv->detach(port); |
| 188 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /* Call detach(port) for each registered driver. */ |
| 192 | static void detach_driver_chain(struct parport *port) |
| 193 | { |
| 194 | struct parport_driver *drv; |
| 195 | /* caller has exclusive registration_lock */ |
| 196 | list_for_each_entry(drv, &drivers, list) |
| 197 | drv->detach (port); |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 198 | |
| 199 | /* |
| 200 | * call the detach function of the drivers registered in |
| 201 | * new device model |
| 202 | */ |
| 203 | |
| 204 | bus_for_each_drv(&parport_bus_type, NULL, port, driver_detach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | /* Ask kmod for some lowlevel drivers. */ |
| 208 | static void get_lowlevel_driver (void) |
| 209 | { |
| 210 | /* There is no actual module called this: you should set |
| 211 | * up an alias for modutils. */ |
| 212 | request_module ("parport_lowlevel"); |
| 213 | } |
| 214 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 215 | /* |
| 216 | * iterates through all the devices connected to the bus and sends the device |
| 217 | * details to the match_port callback of the driver, so that the driver can |
| 218 | * know what are all the ports that are connected to the bus and choose the |
| 219 | * port to which it wants to register its device. |
| 220 | */ |
| 221 | static int port_check(struct device *dev, void *dev_drv) |
| 222 | { |
| 223 | struct parport_driver *drv = dev_drv; |
| 224 | |
| 225 | /* only send ports, do not send other devices connected to bus */ |
| 226 | if (is_parport(dev)) |
| 227 | drv->match_port(to_parport_dev(dev)); |
| 228 | return 0; |
| 229 | } |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | /** |
| 232 | * parport_register_driver - register a parallel port device driver |
| 233 | * @drv: structure describing the driver |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 234 | * @owner: owner module of drv |
| 235 | * @mod_name: module name string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | * |
| 237 | * This can be called by a parallel port device driver in order |
| 238 | * to receive notifications about ports being found in the |
| 239 | * system, as well as ports no longer available. |
| 240 | * |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 241 | * If devmodel is true then the new device model is used |
| 242 | * for registration. |
| 243 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | * The @drv structure is allocated by the caller and must not be |
| 245 | * deallocated until after calling parport_unregister_driver(). |
| 246 | * |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 247 | * If using the non device model: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | * The driver's attach() function may block. The port that |
| 249 | * attach() is given will be valid for the duration of the |
| 250 | * callback, but if the driver wants to take a copy of the |
| 251 | * pointer it must call parport_get_port() to do so. Calling |
| 252 | * parport_register_device() on that port will do this for you. |
| 253 | * |
| 254 | * The driver's detach() function may block. The port that |
| 255 | * detach() is given will be valid for the duration of the |
| 256 | * callback, but if the driver wants to take a copy of the |
| 257 | * pointer it must call parport_get_port() to do so. |
| 258 | * |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 259 | * |
| 260 | * Returns 0 on success. The non device model will always succeeds. |
| 261 | * but the new device model can fail and will return the error code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | **/ |
| 263 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 264 | int __parport_register_driver(struct parport_driver *drv, struct module *owner, |
| 265 | const char *mod_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (list_empty(&portlist)) |
| 268 | get_lowlevel_driver (); |
| 269 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 270 | if (drv->devmodel) { |
| 271 | /* using device model */ |
| 272 | int ret; |
| 273 | |
| 274 | /* initialize common driver fields */ |
| 275 | drv->driver.name = drv->name; |
| 276 | drv->driver.bus = &parport_bus_type; |
| 277 | drv->driver.owner = owner; |
| 278 | drv->driver.mod_name = mod_name; |
| 279 | ret = driver_register(&drv->driver); |
| 280 | if (ret) |
| 281 | return ret; |
| 282 | |
| 283 | mutex_lock(®istration_lock); |
| 284 | if (drv->match_port) |
| 285 | bus_for_each_dev(&parport_bus_type, NULL, drv, |
| 286 | port_check); |
| 287 | mutex_unlock(®istration_lock); |
| 288 | } else { |
| 289 | struct parport *port; |
| 290 | |
| 291 | drv->devmodel = false; |
| 292 | |
| 293 | mutex_lock(®istration_lock); |
| 294 | list_for_each_entry(port, &portlist, list) |
| 295 | drv->attach(port); |
| 296 | list_add(&drv->list, &drivers); |
| 297 | mutex_unlock(®istration_lock); |
| 298 | } |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | EXPORT_SYMBOL(__parport_register_driver); |
| 303 | |
| 304 | static int port_detach(struct device *dev, void *_drv) |
| 305 | { |
| 306 | struct parport_driver *drv = _drv; |
| 307 | |
| 308 | if (is_parport(dev) && drv->detach) |
| 309 | drv->detach(to_parport_dev(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * parport_unregister_driver - deregister a parallel port device driver |
| 316 | * @drv: structure describing the driver that was given to |
| 317 | * parport_register_driver() |
| 318 | * |
| 319 | * This should be called by a parallel port device driver that |
| 320 | * has registered itself using parport_register_driver() when it |
| 321 | * is about to be unloaded. |
| 322 | * |
| 323 | * When it returns, the driver's attach() routine will no longer |
| 324 | * be called, and for each port that attach() was called for, the |
| 325 | * detach() routine will have been called. |
| 326 | * |
| 327 | * All the driver's attach() and detach() calls are guaranteed to have |
| 328 | * finished by the time this function returns. |
| 329 | **/ |
| 330 | |
| 331 | void parport_unregister_driver (struct parport_driver *drv) |
| 332 | { |
| 333 | struct parport *port; |
| 334 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 335 | mutex_lock(®istration_lock); |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 336 | if (drv->devmodel) { |
| 337 | bus_for_each_dev(&parport_bus_type, NULL, drv, port_detach); |
| 338 | driver_unregister(&drv->driver); |
| 339 | } else { |
| 340 | list_del_init(&drv->list); |
| 341 | list_for_each_entry(port, &portlist, list) |
| 342 | drv->detach(port); |
| 343 | } |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 344 | mutex_unlock(®istration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 347 | static void free_port(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
| 349 | int d; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 350 | struct parport *port = to_parport_dev(dev); |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | spin_lock(&full_list_lock); |
| 353 | list_del(&port->full_list); |
| 354 | spin_unlock(&full_list_lock); |
| 355 | for (d = 0; d < 5; d++) { |
Jesper Juhl | 6044ec8 | 2005-11-07 01:01:32 -0800 | [diff] [blame] | 356 | kfree(port->probe_info[d].class_name); |
| 357 | kfree(port->probe_info[d].mfr); |
| 358 | kfree(port->probe_info[d].model); |
| 359 | kfree(port->probe_info[d].cmdset); |
| 360 | kfree(port->probe_info[d].description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | kfree(port->name); |
| 364 | kfree(port); |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * parport_get_port - increment a port's reference count |
| 369 | * @port: the port |
| 370 | * |
Randy Dunlap | 7d46972 | 2006-06-25 05:49:29 -0700 | [diff] [blame] | 371 | * This ensures that a struct parport pointer remains valid |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | * until the matching parport_put_port() call. |
| 373 | **/ |
| 374 | |
| 375 | struct parport *parport_get_port (struct parport *port) |
| 376 | { |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 377 | struct device *dev = get_device(&port->bus_dev); |
| 378 | |
| 379 | return to_parport_dev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 382 | void parport_del_port(struct parport *port) |
| 383 | { |
| 384 | device_unregister(&port->bus_dev); |
| 385 | } |
| 386 | EXPORT_SYMBOL(parport_del_port); |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /** |
| 389 | * parport_put_port - decrement a port's reference count |
| 390 | * @port: the port |
| 391 | * |
| 392 | * This should be called once for each call to parport_get_port(), |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 393 | * once the port is no longer needed. When the reference count reaches |
| 394 | * zero (port is no longer used), free_port is called. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | **/ |
| 396 | |
| 397 | void parport_put_port (struct parport *port) |
| 398 | { |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 399 | put_device(&port->bus_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | /** |
| 403 | * parport_register_port - register a parallel port |
| 404 | * @base: base I/O address |
| 405 | * @irq: IRQ line |
| 406 | * @dma: DMA channel |
| 407 | * @ops: pointer to the port driver's port operations structure |
| 408 | * |
| 409 | * When a parallel port (lowlevel) driver finds a port that |
| 410 | * should be made available to parallel port device drivers, it |
| 411 | * should call parport_register_port(). The @base, @irq, and |
| 412 | * @dma parameters are for the convenience of port drivers, and |
| 413 | * for ports where they aren't meaningful needn't be set to |
| 414 | * anything special. They can be altered afterwards by adjusting |
| 415 | * the relevant members of the parport structure that is returned |
| 416 | * and represents the port. They should not be tampered with |
| 417 | * after calling parport_announce_port, however. |
| 418 | * |
| 419 | * If there are parallel port device drivers in the system that |
| 420 | * have registered themselves using parport_register_driver(), |
| 421 | * they are not told about the port at this time; that is done by |
| 422 | * parport_announce_port(). |
| 423 | * |
| 424 | * The @ops structure is allocated by the caller, and must not be |
| 425 | * deallocated before calling parport_remove_port(). |
| 426 | * |
| 427 | * If there is no memory to allocate a new parport structure, |
| 428 | * this function will return %NULL. |
| 429 | **/ |
| 430 | |
| 431 | struct parport *parport_register_port(unsigned long base, int irq, int dma, |
| 432 | struct parport_operations *ops) |
| 433 | { |
| 434 | struct list_head *l; |
| 435 | struct parport *tmp; |
| 436 | int num; |
| 437 | int device; |
| 438 | char *name; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 439 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
Alexandru Gheorghiu | c32df4e | 2013-07-03 15:09:09 -0700 | [diff] [blame] | 441 | tmp = kzalloc(sizeof(struct parport), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | if (!tmp) { |
| 443 | printk(KERN_WARNING "parport: memory squeeze\n"); |
| 444 | return NULL; |
| 445 | } |
| 446 | |
| 447 | /* Init our structure */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | tmp->base = base; |
| 449 | tmp->irq = irq; |
| 450 | tmp->dma = dma; |
| 451 | tmp->muxport = tmp->daisy = tmp->muxsel = -1; |
| 452 | tmp->modes = 0; |
| 453 | INIT_LIST_HEAD(&tmp->list); |
| 454 | tmp->devices = tmp->cad = NULL; |
| 455 | tmp->flags = 0; |
| 456 | tmp->ops = ops; |
| 457 | tmp->physport = tmp; |
| 458 | memset (tmp->probe_info, 0, 5 * sizeof (struct parport_device_info)); |
| 459 | rwlock_init(&tmp->cad_lock); |
| 460 | spin_lock_init(&tmp->waitlist_lock); |
| 461 | spin_lock_init(&tmp->pardevice_lock); |
| 462 | tmp->ieee1284.mode = IEEE1284_MODE_COMPAT; |
| 463 | tmp->ieee1284.phase = IEEE1284_PH_FWD_IDLE; |
Thomas Gleixner | a529f15 | 2010-09-07 14:32:34 +0000 | [diff] [blame] | 464 | sema_init(&tmp->ieee1284.irq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | tmp->spintime = parport_default_spintime; |
| 466 | atomic_set (&tmp->ref_count, 1); |
| 467 | INIT_LIST_HEAD(&tmp->full_list); |
| 468 | |
| 469 | name = kmalloc(15, GFP_KERNEL); |
| 470 | if (!name) { |
| 471 | printk(KERN_ERR "parport: memory squeeze\n"); |
| 472 | kfree(tmp); |
| 473 | return NULL; |
| 474 | } |
| 475 | /* Search for the lowest free parport number. */ |
| 476 | |
| 477 | spin_lock(&full_list_lock); |
| 478 | for (l = all_ports.next, num = 0; l != &all_ports; l = l->next, num++) { |
| 479 | struct parport *p = list_entry(l, struct parport, full_list); |
| 480 | if (p->number != num) |
| 481 | break; |
| 482 | } |
| 483 | tmp->portnum = tmp->number = num; |
| 484 | list_add_tail(&tmp->full_list, l); |
| 485 | spin_unlock(&full_list_lock); |
| 486 | |
| 487 | /* |
| 488 | * Now that the portnum is known finish doing the Init. |
| 489 | */ |
| 490 | sprintf(name, "parport%d", tmp->portnum = tmp->number); |
| 491 | tmp->name = name; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 492 | tmp->bus_dev.bus = &parport_bus_type; |
| 493 | tmp->bus_dev.release = free_port; |
| 494 | dev_set_name(&tmp->bus_dev, name); |
| 495 | tmp->bus_dev.type = &parport_device_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | for (device = 0; device < 5; device++) |
| 498 | /* assume the worst */ |
| 499 | tmp->probe_info[device].class = PARPORT_CLASS_LEGACY; |
| 500 | |
| 501 | tmp->waithead = tmp->waittail = NULL; |
| 502 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 503 | ret = device_register(&tmp->bus_dev); |
| 504 | if (ret) { |
| 505 | put_device(&tmp->bus_dev); |
| 506 | return NULL; |
| 507 | } |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return tmp; |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * parport_announce_port - tell device drivers about a parallel port |
| 514 | * @port: parallel port to announce |
| 515 | * |
| 516 | * After a port driver has registered a parallel port with |
| 517 | * parport_register_port, and performed any necessary |
| 518 | * initialisation or adjustments, it should call |
| 519 | * parport_announce_port() in order to notify all device drivers |
| 520 | * that have called parport_register_driver(). Their attach() |
| 521 | * functions will be called, with @port as the parameter. |
| 522 | **/ |
| 523 | |
| 524 | void parport_announce_port (struct parport *port) |
| 525 | { |
| 526 | int i; |
| 527 | |
| 528 | #ifdef CONFIG_PARPORT_1284 |
| 529 | /* Analyse the IEEE1284.3 topology of the port. */ |
| 530 | parport_daisy_init(port); |
| 531 | #endif |
| 532 | |
David Brownell | c15a383 | 2007-05-08 00:27:35 -0700 | [diff] [blame] | 533 | if (!port->dev) |
| 534 | printk(KERN_WARNING "%s: fix this legacy " |
| 535 | "no-device port driver!\n", |
| 536 | port->name); |
| 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | parport_proc_register(port); |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 539 | mutex_lock(®istration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | spin_lock_irq(&parportlist_lock); |
| 541 | list_add_tail(&port->list, &portlist); |
| 542 | for (i = 1; i < 3; i++) { |
| 543 | struct parport *slave = port->slaves[i-1]; |
| 544 | if (slave) |
| 545 | list_add_tail(&slave->list, &portlist); |
| 546 | } |
| 547 | spin_unlock_irq(&parportlist_lock); |
| 548 | |
| 549 | /* Let drivers know that new port(s) has arrived. */ |
| 550 | attach_driver_chain (port); |
| 551 | for (i = 1; i < 3; i++) { |
| 552 | struct parport *slave = port->slaves[i-1]; |
| 553 | if (slave) |
| 554 | attach_driver_chain(slave); |
| 555 | } |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 556 | mutex_unlock(®istration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | /** |
| 560 | * parport_remove_port - deregister a parallel port |
| 561 | * @port: parallel port to deregister |
| 562 | * |
| 563 | * When a parallel port driver is forcibly unloaded, or a |
| 564 | * parallel port becomes inaccessible, the port driver must call |
| 565 | * this function in order to deal with device drivers that still |
| 566 | * want to use it. |
| 567 | * |
| 568 | * The parport structure associated with the port has its |
| 569 | * operations structure replaced with one containing 'null' |
| 570 | * operations that return errors or just don't do anything. |
| 571 | * |
| 572 | * Any drivers that have registered themselves using |
| 573 | * parport_register_driver() are notified that the port is no |
| 574 | * longer accessible by having their detach() routines called |
| 575 | * with @port as the parameter. |
| 576 | **/ |
| 577 | |
| 578 | void parport_remove_port(struct parport *port) |
| 579 | { |
| 580 | int i; |
| 581 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 582 | mutex_lock(®istration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | /* Spread the word. */ |
| 585 | detach_driver_chain (port); |
| 586 | |
| 587 | #ifdef CONFIG_PARPORT_1284 |
| 588 | /* Forget the IEEE1284.3 topology of the port. */ |
| 589 | parport_daisy_fini(port); |
| 590 | for (i = 1; i < 3; i++) { |
| 591 | struct parport *slave = port->slaves[i-1]; |
| 592 | if (!slave) |
| 593 | continue; |
| 594 | detach_driver_chain(slave); |
| 595 | parport_daisy_fini(slave); |
| 596 | } |
| 597 | #endif |
| 598 | |
| 599 | port->ops = &dead_ops; |
| 600 | spin_lock(&parportlist_lock); |
| 601 | list_del_init(&port->list); |
| 602 | for (i = 1; i < 3; i++) { |
| 603 | struct parport *slave = port->slaves[i-1]; |
| 604 | if (slave) |
| 605 | list_del_init(&slave->list); |
| 606 | } |
| 607 | spin_unlock(&parportlist_lock); |
| 608 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame] | 609 | mutex_unlock(®istration_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | parport_proc_unregister(port); |
| 612 | |
| 613 | for (i = 1; i < 3; i++) { |
| 614 | struct parport *slave = port->slaves[i-1]; |
| 615 | if (slave) |
| 616 | parport_put_port(slave); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * parport_register_device - register a device on a parallel port |
| 622 | * @port: port to which the device is attached |
| 623 | * @name: a name to refer to the device |
| 624 | * @pf: preemption callback |
| 625 | * @kf: kick callback (wake-up) |
| 626 | * @irq_func: interrupt handler |
| 627 | * @flags: registration flags |
| 628 | * @handle: data for callback functions |
| 629 | * |
| 630 | * This function, called by parallel port device drivers, |
| 631 | * declares that a device is connected to a port, and tells the |
| 632 | * system all it needs to know. |
| 633 | * |
| 634 | * The @name is allocated by the caller and must not be |
| 635 | * deallocated until the caller calls @parport_unregister_device |
| 636 | * for that device. |
| 637 | * |
| 638 | * The preemption callback function, @pf, is called when this |
| 639 | * device driver has claimed access to the port but another |
| 640 | * device driver wants to use it. It is given @handle as its |
| 641 | * parameter, and should return zero if it is willing for the |
| 642 | * system to release the port to another driver on its behalf. |
| 643 | * If it wants to keep control of the port it should return |
| 644 | * non-zero, and no action will be taken. It is good manners for |
| 645 | * the driver to try to release the port at the earliest |
| 646 | * opportunity after its preemption callback rejects a preemption |
| 647 | * attempt. Note that if a preemption callback is happy for |
| 648 | * preemption to go ahead, there is no need to release the port; |
| 649 | * it is done automatically. This function may not block, as it |
| 650 | * may be called from interrupt context. If the device driver |
| 651 | * does not support preemption, @pf can be %NULL. |
| 652 | * |
| 653 | * The wake-up ("kick") callback function, @kf, is called when |
| 654 | * the port is available to be claimed for exclusive access; that |
| 655 | * is, parport_claim() is guaranteed to succeed when called from |
| 656 | * inside the wake-up callback function. If the driver wants to |
| 657 | * claim the port it should do so; otherwise, it need not take |
| 658 | * any action. This function may not block, as it may be called |
| 659 | * from interrupt context. If the device driver does not want to |
| 660 | * be explicitly invited to claim the port in this way, @kf can |
| 661 | * be %NULL. |
| 662 | * |
| 663 | * The interrupt handler, @irq_func, is called when an interrupt |
| 664 | * arrives from the parallel port. Note that if a device driver |
| 665 | * wants to use interrupts it should use parport_enable_irq(), |
| 666 | * and can also check the irq member of the parport structure |
| 667 | * representing the port. |
| 668 | * |
| 669 | * The parallel port (lowlevel) driver is the one that has called |
| 670 | * request_irq() and whose interrupt handler is called first. |
| 671 | * This handler does whatever needs to be done to the hardware to |
| 672 | * acknowledge the interrupt (for PC-style ports there is nothing |
| 673 | * special to be done). It then tells the IEEE 1284 code about |
| 674 | * the interrupt, which may involve reacting to an IEEE 1284 |
| 675 | * event depending on the current IEEE 1284 phase. After this, |
| 676 | * it calls @irq_func. Needless to say, @irq_func will be called |
| 677 | * from interrupt context, and may not block. |
| 678 | * |
| 679 | * The %PARPORT_DEV_EXCL flag is for preventing port sharing, and |
| 680 | * so should only be used when sharing the port with other device |
| 681 | * drivers is impossible and would lead to incorrect behaviour. |
| 682 | * Use it sparingly! Normally, @flags will be zero. |
| 683 | * |
| 684 | * This function returns a pointer to a structure that represents |
| 685 | * the device on the port, or %NULL if there is not enough memory |
| 686 | * to allocate space for that structure. |
| 687 | **/ |
| 688 | |
| 689 | struct pardevice * |
| 690 | parport_register_device(struct parport *port, const char *name, |
| 691 | int (*pf)(void *), void (*kf)(void *), |
Jeff Garzik | 5712cb3 | 2007-10-19 02:54:26 -0400 | [diff] [blame] | 692 | void (*irq_func)(void *), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | int flags, void *handle) |
| 694 | { |
| 695 | struct pardevice *tmp; |
| 696 | |
| 697 | if (port->physport->flags & PARPORT_FLAG_EXCL) { |
| 698 | /* An exclusive device is registered. */ |
| 699 | printk (KERN_DEBUG "%s: no more devices allowed\n", |
| 700 | port->name); |
| 701 | return NULL; |
| 702 | } |
| 703 | |
| 704 | if (flags & PARPORT_DEV_LURK) { |
| 705 | if (!pf || !kf) { |
| 706 | printk(KERN_INFO "%s: refused to register lurking device (%s) without callbacks\n", port->name, name); |
| 707 | return NULL; |
| 708 | } |
| 709 | } |
| 710 | |
Sudip Mukherjee | 50566ac8 | 2015-06-12 15:20:20 +0530 | [diff] [blame] | 711 | if (flags & PARPORT_DEV_EXCL) { |
| 712 | if (port->physport->devices) { |
| 713 | /* |
| 714 | * If a device is already registered and this new |
| 715 | * device wants exclusive access, then no need to |
| 716 | * continue as we can not grant exclusive access to |
| 717 | * this device. |
| 718 | */ |
| 719 | pr_err("%s: cannot grant exclusive access for device %s\n", |
| 720 | port->name, name); |
| 721 | return NULL; |
| 722 | } |
| 723 | } |
| 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | /* We up our own module reference count, and that of the port |
| 726 | on which a device is to be registered, to ensure that |
| 727 | neither of us gets unloaded while we sleep in (e.g.) |
| 728 | kmalloc. |
| 729 | */ |
| 730 | if (!try_module_get(port->ops->owner)) { |
| 731 | return NULL; |
| 732 | } |
| 733 | |
| 734 | parport_get_port (port); |
| 735 | |
| 736 | tmp = kmalloc(sizeof(struct pardevice), GFP_KERNEL); |
| 737 | if (tmp == NULL) { |
| 738 | printk(KERN_WARNING "%s: memory squeeze, couldn't register %s.\n", port->name, name); |
| 739 | goto out; |
| 740 | } |
| 741 | |
| 742 | tmp->state = kmalloc(sizeof(struct parport_state), GFP_KERNEL); |
| 743 | if (tmp->state == NULL) { |
| 744 | printk(KERN_WARNING "%s: memory squeeze, couldn't register %s.\n", port->name, name); |
| 745 | goto out_free_pardevice; |
| 746 | } |
| 747 | |
| 748 | tmp->name = name; |
| 749 | tmp->port = port; |
| 750 | tmp->daisy = -1; |
| 751 | tmp->preempt = pf; |
| 752 | tmp->wakeup = kf; |
| 753 | tmp->private = handle; |
| 754 | tmp->flags = flags; |
| 755 | tmp->irq_func = irq_func; |
| 756 | tmp->waiting = 0; |
| 757 | tmp->timeout = 5 * HZ; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 758 | tmp->devmodel = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | /* Chain this onto the list */ |
| 761 | tmp->prev = NULL; |
| 762 | /* |
| 763 | * This function must not run from an irq handler so we don' t need |
| 764 | * to clear irq on the local CPU. -arca |
| 765 | */ |
| 766 | spin_lock(&port->physport->pardevice_lock); |
| 767 | |
| 768 | if (flags & PARPORT_DEV_EXCL) { |
| 769 | if (port->physport->devices) { |
| 770 | spin_unlock (&port->physport->pardevice_lock); |
| 771 | printk (KERN_DEBUG |
| 772 | "%s: cannot grant exclusive access for " |
| 773 | "device %s\n", port->name, name); |
| 774 | goto out_free_all; |
| 775 | } |
| 776 | port->flags |= PARPORT_FLAG_EXCL; |
| 777 | } |
| 778 | |
| 779 | tmp->next = port->physport->devices; |
| 780 | wmb(); /* Make sure that tmp->next is written before it's |
| 781 | added to the list; see comments marked 'no locking |
| 782 | required' */ |
| 783 | if (port->physport->devices) |
| 784 | port->physport->devices->prev = tmp; |
| 785 | port->physport->devices = tmp; |
| 786 | spin_unlock(&port->physport->pardevice_lock); |
| 787 | |
| 788 | init_waitqueue_head(&tmp->wait_q); |
| 789 | tmp->timeslice = parport_default_timeslice; |
| 790 | tmp->waitnext = tmp->waitprev = NULL; |
| 791 | |
| 792 | /* |
| 793 | * This has to be run as last thing since init_state may need other |
| 794 | * pardevice fields. -arca |
| 795 | */ |
| 796 | port->ops->init_state(tmp, tmp->state); |
Alan Cox | 05ad709 | 2009-06-02 16:58:10 +0100 | [diff] [blame] | 797 | if (!test_and_set_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags)) { |
| 798 | port->proc_device = tmp; |
| 799 | parport_device_proc_register(tmp); |
| 800 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | return tmp; |
| 802 | |
| 803 | out_free_all: |
Jesper Juhl | 6044ec8 | 2005-11-07 01:01:32 -0800 | [diff] [blame] | 804 | kfree(tmp->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | out_free_pardevice: |
Jesper Juhl | 6044ec8 | 2005-11-07 01:01:32 -0800 | [diff] [blame] | 806 | kfree(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | out: |
| 808 | parport_put_port (port); |
| 809 | module_put(port->ops->owner); |
| 810 | |
| 811 | return NULL; |
| 812 | } |
| 813 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 814 | static void free_pardevice(struct device *dev) |
| 815 | { |
| 816 | struct pardevice *par_dev = to_pardevice(dev); |
| 817 | |
| 818 | kfree(par_dev->name); |
| 819 | kfree(par_dev); |
| 820 | } |
| 821 | |
| 822 | struct pardevice * |
| 823 | parport_register_dev_model(struct parport *port, const char *name, |
| 824 | const struct pardev_cb *par_dev_cb, int id) |
| 825 | { |
| 826 | struct pardevice *par_dev; |
| 827 | int ret; |
| 828 | char *devname; |
| 829 | |
| 830 | if (port->physport->flags & PARPORT_FLAG_EXCL) { |
| 831 | /* An exclusive device is registered. */ |
| 832 | pr_err("%s: no more devices allowed\n", port->name); |
| 833 | return NULL; |
| 834 | } |
| 835 | |
| 836 | if (par_dev_cb->flags & PARPORT_DEV_LURK) { |
| 837 | if (!par_dev_cb->preempt || !par_dev_cb->wakeup) { |
| 838 | pr_info("%s: refused to register lurking device (%s) without callbacks\n", |
| 839 | port->name, name); |
| 840 | return NULL; |
| 841 | } |
| 842 | } |
| 843 | |
Sudip Mukherjee | 50566ac8 | 2015-06-12 15:20:20 +0530 | [diff] [blame] | 844 | if (par_dev_cb->flags & PARPORT_DEV_EXCL) { |
| 845 | if (port->physport->devices) { |
| 846 | /* |
| 847 | * If a device is already registered and this new |
| 848 | * device wants exclusive access, then no need to |
| 849 | * continue as we can not grant exclusive access to |
| 850 | * this device. |
| 851 | */ |
| 852 | pr_err("%s: cannot grant exclusive access for device %s\n", |
| 853 | port->name, name); |
| 854 | return NULL; |
| 855 | } |
| 856 | } |
| 857 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 858 | if (!try_module_get(port->ops->owner)) |
| 859 | return NULL; |
| 860 | |
| 861 | parport_get_port(port); |
| 862 | |
| 863 | par_dev = kzalloc(sizeof(*par_dev), GFP_KERNEL); |
| 864 | if (!par_dev) |
| 865 | goto err_put_port; |
| 866 | |
| 867 | par_dev->state = kzalloc(sizeof(*par_dev->state), GFP_KERNEL); |
| 868 | if (!par_dev->state) |
| 869 | goto err_put_par_dev; |
| 870 | |
| 871 | devname = kstrdup(name, GFP_KERNEL); |
| 872 | if (!devname) |
| 873 | goto err_free_par_dev; |
| 874 | |
| 875 | par_dev->name = devname; |
| 876 | par_dev->port = port; |
| 877 | par_dev->daisy = -1; |
| 878 | par_dev->preempt = par_dev_cb->preempt; |
| 879 | par_dev->wakeup = par_dev_cb->wakeup; |
| 880 | par_dev->private = par_dev_cb->private; |
| 881 | par_dev->flags = par_dev_cb->flags; |
| 882 | par_dev->irq_func = par_dev_cb->irq_func; |
| 883 | par_dev->waiting = 0; |
| 884 | par_dev->timeout = 5 * HZ; |
| 885 | |
| 886 | par_dev->dev.parent = &port->bus_dev; |
| 887 | par_dev->dev.bus = &parport_bus_type; |
| 888 | ret = dev_set_name(&par_dev->dev, "%s.%d", devname, id); |
| 889 | if (ret) |
| 890 | goto err_free_devname; |
| 891 | par_dev->dev.release = free_pardevice; |
| 892 | par_dev->devmodel = true; |
| 893 | ret = device_register(&par_dev->dev); |
Sudip Mukherjee | 68d35c7 | 2015-06-15 20:05:51 +0530 | [diff] [blame] | 894 | if (ret) { |
| 895 | put_device(&par_dev->dev); |
| 896 | goto err_put_port; |
| 897 | } |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 898 | |
| 899 | /* Chain this onto the list */ |
| 900 | par_dev->prev = NULL; |
| 901 | /* |
| 902 | * This function must not run from an irq handler so we don' t need |
| 903 | * to clear irq on the local CPU. -arca |
| 904 | */ |
| 905 | spin_lock(&port->physport->pardevice_lock); |
| 906 | |
| 907 | if (par_dev_cb->flags & PARPORT_DEV_EXCL) { |
| 908 | if (port->physport->devices) { |
| 909 | spin_unlock(&port->physport->pardevice_lock); |
| 910 | pr_debug("%s: cannot grant exclusive access for device %s\n", |
| 911 | port->name, name); |
Sudip Mukherjee | cabea69 | 2015-06-15 20:05:49 +0530 | [diff] [blame] | 912 | device_unregister(&par_dev->dev); |
| 913 | goto err_put_port; |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 914 | } |
| 915 | port->flags |= PARPORT_FLAG_EXCL; |
| 916 | } |
| 917 | |
| 918 | par_dev->next = port->physport->devices; |
| 919 | wmb(); /* |
| 920 | * Make sure that tmp->next is written before it's |
| 921 | * added to the list; see comments marked 'no locking |
| 922 | * required' |
| 923 | */ |
| 924 | if (port->physport->devices) |
| 925 | port->physport->devices->prev = par_dev; |
| 926 | port->physport->devices = par_dev; |
| 927 | spin_unlock(&port->physport->pardevice_lock); |
| 928 | |
| 929 | init_waitqueue_head(&par_dev->wait_q); |
| 930 | par_dev->timeslice = parport_default_timeslice; |
| 931 | par_dev->waitnext = NULL; |
| 932 | par_dev->waitprev = NULL; |
| 933 | |
| 934 | /* |
| 935 | * This has to be run as last thing since init_state may need other |
| 936 | * pardevice fields. -arca |
| 937 | */ |
| 938 | port->ops->init_state(par_dev, par_dev->state); |
| 939 | port->proc_device = par_dev; |
| 940 | parport_device_proc_register(par_dev); |
| 941 | |
| 942 | return par_dev; |
| 943 | |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 944 | err_free_devname: |
| 945 | kfree(devname); |
| 946 | err_free_par_dev: |
| 947 | kfree(par_dev->state); |
| 948 | err_put_par_dev: |
| 949 | if (!par_dev->devmodel) |
| 950 | kfree(par_dev); |
| 951 | err_put_port: |
| 952 | parport_put_port(port); |
| 953 | module_put(port->ops->owner); |
| 954 | |
| 955 | return NULL; |
| 956 | } |
| 957 | EXPORT_SYMBOL(parport_register_dev_model); |
| 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | /** |
| 960 | * parport_unregister_device - deregister a device on a parallel port |
| 961 | * @dev: pointer to structure representing device |
| 962 | * |
| 963 | * This undoes the effect of parport_register_device(). |
| 964 | **/ |
| 965 | |
| 966 | void parport_unregister_device(struct pardevice *dev) |
| 967 | { |
| 968 | struct parport *port; |
| 969 | |
| 970 | #ifdef PARPORT_PARANOID |
| 971 | if (dev == NULL) { |
| 972 | printk(KERN_ERR "parport_unregister_device: passed NULL\n"); |
| 973 | return; |
| 974 | } |
| 975 | #endif |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | port = dev->port->physport; |
| 978 | |
Alan Cox | 05ad709 | 2009-06-02 16:58:10 +0100 | [diff] [blame] | 979 | if (port->proc_device == dev) { |
| 980 | port->proc_device = NULL; |
| 981 | clear_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags); |
| 982 | parport_device_proc_unregister(dev); |
| 983 | } |
| 984 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | if (port->cad == dev) { |
| 986 | printk(KERN_DEBUG "%s: %s forgot to release port\n", |
| 987 | port->name, dev->name); |
| 988 | parport_release (dev); |
| 989 | } |
| 990 | |
| 991 | spin_lock(&port->pardevice_lock); |
| 992 | if (dev->next) |
| 993 | dev->next->prev = dev->prev; |
| 994 | if (dev->prev) |
| 995 | dev->prev->next = dev->next; |
| 996 | else |
| 997 | port->devices = dev->next; |
| 998 | |
| 999 | if (dev->flags & PARPORT_DEV_EXCL) |
| 1000 | port->flags &= ~PARPORT_FLAG_EXCL; |
| 1001 | |
| 1002 | spin_unlock(&port->pardevice_lock); |
| 1003 | |
| 1004 | /* Make sure we haven't left any pointers around in the wait |
| 1005 | * list. */ |
Alexander Gordeev | cbeb4b7 | 2011-01-25 15:07:16 -0800 | [diff] [blame] | 1006 | spin_lock_irq(&port->waitlist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | if (dev->waitprev || dev->waitnext || port->waithead == dev) { |
| 1008 | if (dev->waitprev) |
| 1009 | dev->waitprev->waitnext = dev->waitnext; |
| 1010 | else |
| 1011 | port->waithead = dev->waitnext; |
| 1012 | if (dev->waitnext) |
| 1013 | dev->waitnext->waitprev = dev->waitprev; |
| 1014 | else |
| 1015 | port->waittail = dev->waitprev; |
| 1016 | } |
Alexander Gordeev | cbeb4b7 | 2011-01-25 15:07:16 -0800 | [diff] [blame] | 1017 | spin_unlock_irq(&port->waitlist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
| 1019 | kfree(dev->state); |
Sudip Mukherjee | 6fa45a2 | 2015-05-20 20:56:57 +0530 | [diff] [blame] | 1020 | if (dev->devmodel) |
| 1021 | device_unregister(&dev->dev); |
| 1022 | else |
| 1023 | kfree(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
| 1025 | module_put(port->ops->owner); |
| 1026 | parport_put_port (port); |
| 1027 | } |
| 1028 | |
| 1029 | /** |
| 1030 | * parport_find_number - find a parallel port by number |
| 1031 | * @number: parallel port number |
| 1032 | * |
| 1033 | * This returns the parallel port with the specified number, or |
| 1034 | * %NULL if there is none. |
| 1035 | * |
| 1036 | * There is an implicit parport_get_port() done already; to throw |
| 1037 | * away the reference to the port that parport_find_number() |
| 1038 | * gives you, use parport_put_port(). |
| 1039 | */ |
| 1040 | |
| 1041 | struct parport *parport_find_number (int number) |
| 1042 | { |
| 1043 | struct parport *port, *result = NULL; |
| 1044 | |
| 1045 | if (list_empty(&portlist)) |
| 1046 | get_lowlevel_driver (); |
| 1047 | |
| 1048 | spin_lock (&parportlist_lock); |
| 1049 | list_for_each_entry(port, &portlist, list) { |
| 1050 | if (port->number == number) { |
| 1051 | result = parport_get_port (port); |
| 1052 | break; |
| 1053 | } |
| 1054 | } |
| 1055 | spin_unlock (&parportlist_lock); |
| 1056 | return result; |
| 1057 | } |
| 1058 | |
| 1059 | /** |
| 1060 | * parport_find_base - find a parallel port by base address |
| 1061 | * @base: base I/O address |
| 1062 | * |
| 1063 | * This returns the parallel port with the specified base |
| 1064 | * address, or %NULL if there is none. |
| 1065 | * |
| 1066 | * There is an implicit parport_get_port() done already; to throw |
| 1067 | * away the reference to the port that parport_find_base() |
| 1068 | * gives you, use parport_put_port(). |
| 1069 | */ |
| 1070 | |
| 1071 | struct parport *parport_find_base (unsigned long base) |
| 1072 | { |
| 1073 | struct parport *port, *result = NULL; |
| 1074 | |
| 1075 | if (list_empty(&portlist)) |
| 1076 | get_lowlevel_driver (); |
| 1077 | |
| 1078 | spin_lock (&parportlist_lock); |
| 1079 | list_for_each_entry(port, &portlist, list) { |
| 1080 | if (port->base == base) { |
| 1081 | result = parport_get_port (port); |
| 1082 | break; |
| 1083 | } |
| 1084 | } |
| 1085 | spin_unlock (&parportlist_lock); |
| 1086 | return result; |
| 1087 | } |
| 1088 | |
| 1089 | /** |
| 1090 | * parport_claim - claim access to a parallel port device |
| 1091 | * @dev: pointer to structure representing a device on the port |
| 1092 | * |
| 1093 | * This function will not block and so can be used from interrupt |
| 1094 | * context. If parport_claim() succeeds in claiming access to |
| 1095 | * the port it returns zero and the port is available to use. It |
| 1096 | * may fail (returning non-zero) if the port is in use by another |
| 1097 | * driver and that driver is not willing to relinquish control of |
| 1098 | * the port. |
| 1099 | **/ |
| 1100 | |
| 1101 | int parport_claim(struct pardevice *dev) |
| 1102 | { |
| 1103 | struct pardevice *oldcad; |
| 1104 | struct parport *port = dev->port->physport; |
| 1105 | unsigned long flags; |
| 1106 | |
| 1107 | if (port->cad == dev) { |
| 1108 | printk(KERN_INFO "%s: %s already owner\n", |
| 1109 | dev->port->name,dev->name); |
| 1110 | return 0; |
| 1111 | } |
| 1112 | |
| 1113 | /* Preempt any current device */ |
| 1114 | write_lock_irqsave (&port->cad_lock, flags); |
| 1115 | if ((oldcad = port->cad) != NULL) { |
| 1116 | if (oldcad->preempt) { |
| 1117 | if (oldcad->preempt(oldcad->private)) |
| 1118 | goto blocked; |
| 1119 | port->ops->save_state(port, dev->state); |
| 1120 | } else |
| 1121 | goto blocked; |
| 1122 | |
| 1123 | if (port->cad != oldcad) { |
| 1124 | /* I think we'll actually deadlock rather than |
| 1125 | get here, but just in case.. */ |
| 1126 | printk(KERN_WARNING |
| 1127 | "%s: %s released port when preempted!\n", |
| 1128 | port->name, oldcad->name); |
| 1129 | if (port->cad) |
| 1130 | goto blocked; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | /* Can't fail from now on, so mark ourselves as no longer waiting. */ |
| 1135 | if (dev->waiting & 1) { |
| 1136 | dev->waiting = 0; |
| 1137 | |
| 1138 | /* Take ourselves out of the wait list again. */ |
| 1139 | spin_lock_irq (&port->waitlist_lock); |
| 1140 | if (dev->waitprev) |
| 1141 | dev->waitprev->waitnext = dev->waitnext; |
| 1142 | else |
| 1143 | port->waithead = dev->waitnext; |
| 1144 | if (dev->waitnext) |
| 1145 | dev->waitnext->waitprev = dev->waitprev; |
| 1146 | else |
| 1147 | port->waittail = dev->waitprev; |
| 1148 | spin_unlock_irq (&port->waitlist_lock); |
| 1149 | dev->waitprev = dev->waitnext = NULL; |
| 1150 | } |
| 1151 | |
| 1152 | /* Now we do the change of devices */ |
| 1153 | port->cad = dev; |
| 1154 | |
| 1155 | #ifdef CONFIG_PARPORT_1284 |
| 1156 | /* If it's a mux port, select it. */ |
| 1157 | if (dev->port->muxport >= 0) { |
| 1158 | /* FIXME */ |
| 1159 | port->muxsel = dev->port->muxport; |
| 1160 | } |
| 1161 | |
| 1162 | /* If it's a daisy chain device, select it. */ |
| 1163 | if (dev->daisy >= 0) { |
| 1164 | /* This could be lazier. */ |
| 1165 | if (!parport_daisy_select (port, dev->daisy, |
| 1166 | IEEE1284_MODE_COMPAT)) |
| 1167 | port->daisy = dev->daisy; |
| 1168 | } |
| 1169 | #endif /* IEEE1284.3 support */ |
| 1170 | |
| 1171 | /* Restore control registers */ |
| 1172 | port->ops->restore_state(port, dev->state); |
| 1173 | write_unlock_irqrestore(&port->cad_lock, flags); |
| 1174 | dev->time = jiffies; |
| 1175 | return 0; |
| 1176 | |
| 1177 | blocked: |
| 1178 | /* If this is the first time we tried to claim the port, register an |
| 1179 | interest. This is only allowed for devices sleeping in |
| 1180 | parport_claim_or_block(), or those with a wakeup function. */ |
| 1181 | |
| 1182 | /* The cad_lock is still held for writing here */ |
| 1183 | if (dev->waiting & 2 || dev->wakeup) { |
| 1184 | spin_lock (&port->waitlist_lock); |
| 1185 | if (test_and_set_bit(0, &dev->waiting) == 0) { |
| 1186 | /* First add ourselves to the end of the wait list. */ |
| 1187 | dev->waitnext = NULL; |
| 1188 | dev->waitprev = port->waittail; |
| 1189 | if (port->waittail) { |
| 1190 | port->waittail->waitnext = dev; |
| 1191 | port->waittail = dev; |
| 1192 | } else |
| 1193 | port->waithead = port->waittail = dev; |
| 1194 | } |
| 1195 | spin_unlock (&port->waitlist_lock); |
| 1196 | } |
| 1197 | write_unlock_irqrestore (&port->cad_lock, flags); |
| 1198 | return -EAGAIN; |
| 1199 | } |
| 1200 | |
| 1201 | /** |
| 1202 | * parport_claim_or_block - claim access to a parallel port device |
| 1203 | * @dev: pointer to structure representing a device on the port |
| 1204 | * |
| 1205 | * This behaves like parport_claim(), but will block if necessary |
| 1206 | * to wait for the port to be free. A return value of 1 |
| 1207 | * indicates that it slept; 0 means that it succeeded without |
| 1208 | * needing to sleep. A negative error code indicates failure. |
| 1209 | **/ |
| 1210 | |
| 1211 | int parport_claim_or_block(struct pardevice *dev) |
| 1212 | { |
| 1213 | int r; |
| 1214 | |
| 1215 | /* Signal to parport_claim() that we can wait even without a |
| 1216 | wakeup function. */ |
| 1217 | dev->waiting = 2; |
| 1218 | |
| 1219 | /* Try to claim the port. If this fails, we need to sleep. */ |
| 1220 | r = parport_claim(dev); |
| 1221 | if (r == -EAGAIN) { |
| 1222 | #ifdef PARPORT_DEBUG_SHARING |
| 1223 | printk(KERN_DEBUG "%s: parport_claim() returned -EAGAIN\n", dev->name); |
| 1224 | #endif |
| 1225 | /* |
| 1226 | * FIXME!!! Use the proper locking for dev->waiting, |
| 1227 | * and make this use the "wait_event_interruptible()" |
| 1228 | * interfaces. The cli/sti that used to be here |
| 1229 | * did nothing. |
| 1230 | * |
| 1231 | * See also parport_release() |
| 1232 | */ |
| 1233 | |
| 1234 | /* If dev->waiting is clear now, an interrupt |
| 1235 | gave us the port and we would deadlock if we slept. */ |
| 1236 | if (dev->waiting) { |
Arnd Bergmann | 76ae053 | 2014-02-26 12:01:49 +0100 | [diff] [blame] | 1237 | wait_event_interruptible(dev->wait_q, |
| 1238 | !dev->waiting); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | if (signal_pending (current)) { |
| 1240 | return -EINTR; |
| 1241 | } |
| 1242 | r = 1; |
| 1243 | } else { |
| 1244 | r = 0; |
| 1245 | #ifdef PARPORT_DEBUG_SHARING |
| 1246 | printk(KERN_DEBUG "%s: didn't sleep in parport_claim_or_block()\n", |
| 1247 | dev->name); |
| 1248 | #endif |
| 1249 | } |
| 1250 | |
| 1251 | #ifdef PARPORT_DEBUG_SHARING |
| 1252 | if (dev->port->physport->cad != dev) |
| 1253 | printk(KERN_DEBUG "%s: exiting parport_claim_or_block " |
| 1254 | "but %s owns port!\n", dev->name, |
| 1255 | dev->port->physport->cad ? |
| 1256 | dev->port->physport->cad->name:"nobody"); |
| 1257 | #endif |
| 1258 | } |
| 1259 | dev->waiting = 0; |
| 1260 | return r; |
| 1261 | } |
| 1262 | |
| 1263 | /** |
| 1264 | * parport_release - give up access to a parallel port device |
| 1265 | * @dev: pointer to structure representing parallel port device |
| 1266 | * |
| 1267 | * This function cannot fail, but it should not be called without |
| 1268 | * the port claimed. Similarly, if the port is already claimed |
| 1269 | * you should not try claiming it again. |
| 1270 | **/ |
| 1271 | |
| 1272 | void parport_release(struct pardevice *dev) |
| 1273 | { |
| 1274 | struct parport *port = dev->port->physport; |
| 1275 | struct pardevice *pd; |
| 1276 | unsigned long flags; |
| 1277 | |
| 1278 | /* Make sure that dev is the current device */ |
| 1279 | write_lock_irqsave(&port->cad_lock, flags); |
| 1280 | if (port->cad != dev) { |
| 1281 | write_unlock_irqrestore (&port->cad_lock, flags); |
| 1282 | printk(KERN_WARNING "%s: %s tried to release parport " |
| 1283 | "when not owner\n", port->name, dev->name); |
| 1284 | return; |
| 1285 | } |
| 1286 | |
| 1287 | #ifdef CONFIG_PARPORT_1284 |
| 1288 | /* If this is on a mux port, deselect it. */ |
| 1289 | if (dev->port->muxport >= 0) { |
| 1290 | /* FIXME */ |
| 1291 | port->muxsel = -1; |
| 1292 | } |
| 1293 | |
| 1294 | /* If this is a daisy device, deselect it. */ |
| 1295 | if (dev->daisy >= 0) { |
| 1296 | parport_daisy_deselect_all (port); |
| 1297 | port->daisy = -1; |
| 1298 | } |
| 1299 | #endif |
| 1300 | |
| 1301 | port->cad = NULL; |
| 1302 | write_unlock_irqrestore(&port->cad_lock, flags); |
| 1303 | |
| 1304 | /* Save control registers */ |
| 1305 | port->ops->save_state(port, dev->state); |
| 1306 | |
| 1307 | /* If anybody is waiting, find out who's been there longest and |
| 1308 | then wake them up. (Note: no locking required) */ |
| 1309 | /* !!! LOCKING IS NEEDED HERE */ |
| 1310 | for (pd = port->waithead; pd; pd = pd->waitnext) { |
| 1311 | if (pd->waiting & 2) { /* sleeping in claim_or_block */ |
| 1312 | parport_claim(pd); |
| 1313 | if (waitqueue_active(&pd->wait_q)) |
| 1314 | wake_up_interruptible(&pd->wait_q); |
| 1315 | return; |
| 1316 | } else if (pd->wakeup) { |
| 1317 | pd->wakeup(pd->private); |
| 1318 | if (dev->port->cad) /* racy but no matter */ |
| 1319 | return; |
| 1320 | } else { |
| 1321 | printk(KERN_ERR "%s: don't know how to wake %s\n", port->name, pd->name); |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | /* Nobody was waiting, so walk the list to see if anyone is |
| 1326 | interested in being woken up. (Note: no locking required) */ |
| 1327 | /* !!! LOCKING IS NEEDED HERE */ |
| 1328 | for (pd = port->devices; (port->cad == NULL) && pd; pd = pd->next) { |
| 1329 | if (pd->wakeup && pd != dev) |
| 1330 | pd->wakeup(pd->private); |
| 1331 | } |
| 1332 | } |
| 1333 | |
Jeff Garzik | 3f2e40d | 2007-10-19 01:42:14 -0400 | [diff] [blame] | 1334 | irqreturn_t parport_irq_handler(int irq, void *dev_id) |
| 1335 | { |
| 1336 | struct parport *port = dev_id; |
| 1337 | |
Jeff Garzik | f230d10 | 2007-10-19 01:56:02 -0400 | [diff] [blame] | 1338 | parport_generic_irq(port); |
Jeff Garzik | 3f2e40d | 2007-10-19 01:42:14 -0400 | [diff] [blame] | 1339 | |
| 1340 | return IRQ_HANDLED; |
| 1341 | } |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | /* Exported symbols for modules. */ |
| 1344 | |
| 1345 | EXPORT_SYMBOL(parport_claim); |
| 1346 | EXPORT_SYMBOL(parport_claim_or_block); |
| 1347 | EXPORT_SYMBOL(parport_release); |
| 1348 | EXPORT_SYMBOL(parport_register_port); |
| 1349 | EXPORT_SYMBOL(parport_announce_port); |
| 1350 | EXPORT_SYMBOL(parport_remove_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | EXPORT_SYMBOL(parport_unregister_driver); |
| 1352 | EXPORT_SYMBOL(parport_register_device); |
| 1353 | EXPORT_SYMBOL(parport_unregister_device); |
Marko Kohtala | 94b8209 | 2006-01-06 00:19:51 -0800 | [diff] [blame] | 1354 | EXPORT_SYMBOL(parport_get_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | EXPORT_SYMBOL(parport_put_port); |
| 1356 | EXPORT_SYMBOL(parport_find_number); |
| 1357 | EXPORT_SYMBOL(parport_find_base); |
Jeff Garzik | 3f2e40d | 2007-10-19 01:42:14 -0400 | [diff] [blame] | 1358 | EXPORT_SYMBOL(parport_irq_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | |
| 1360 | MODULE_LICENSE("GPL"); |