Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the Diolan DLN-2 USB adapter |
| 3 | * |
| 4 | * Copyright (c) 2014 Intel Corporation |
| 5 | * |
| 6 | * Derived from: |
| 7 | * i2c-diolan-u2c.c |
| 8 | * Copyright (c) 2010-2011 Ericsson AB |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License as |
| 12 | * published by the Free Software Foundation, version 2. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/usb.h> |
| 20 | #include <linux/i2c.h> |
| 21 | #include <linux/mutex.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/mfd/core.h> |
| 24 | #include <linux/mfd/dln2.h> |
| 25 | #include <linux/rculist.h> |
| 26 | |
| 27 | struct dln2_header { |
| 28 | __le16 size; |
| 29 | __le16 id; |
| 30 | __le16 echo; |
| 31 | __le16 handle; |
| 32 | }; |
| 33 | |
| 34 | struct dln2_response { |
| 35 | struct dln2_header hdr; |
| 36 | __le16 result; |
| 37 | }; |
| 38 | |
| 39 | #define DLN2_GENERIC_MODULE_ID 0x00 |
| 40 | #define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID) |
| 41 | #define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30) |
| 42 | #define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31) |
| 43 | |
| 44 | #define DLN2_HW_ID 0x200 |
| 45 | #define DLN2_USB_TIMEOUT 200 /* in ms */ |
| 46 | #define DLN2_MAX_RX_SLOTS 16 |
| 47 | #define DLN2_MAX_URBS 16 |
| 48 | #define DLN2_RX_BUF_SIZE 512 |
| 49 | |
| 50 | enum dln2_handle { |
| 51 | DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */ |
| 52 | DLN2_HANDLE_CTRL, |
| 53 | DLN2_HANDLE_GPIO, |
| 54 | DLN2_HANDLE_I2C, |
Laurentiu Palcu | 21cf331 | 2014-11-07 14:45:14 +0200 | [diff] [blame] | 55 | DLN2_HANDLE_SPI, |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 56 | DLN2_HANDLES |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * Receive context used between the receive demultiplexer and the transfer |
| 61 | * routine. While sending a request the transfer routine will look for a free |
| 62 | * receive context and use it to wait for a response and to receive the URB and |
| 63 | * thus the response data. |
| 64 | */ |
| 65 | struct dln2_rx_context { |
| 66 | /* completion used to wait for a response */ |
| 67 | struct completion done; |
| 68 | |
| 69 | /* if non-NULL the URB contains the response */ |
| 70 | struct urb *urb; |
| 71 | |
| 72 | /* if true then this context is used to wait for a response */ |
| 73 | bool in_use; |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the |
| 78 | * handle header field to identify the module in dln2_dev.mod_rx_slots and then |
| 79 | * the echo header field to index the slots field and find the receive context |
| 80 | * for a particular request. |
| 81 | */ |
| 82 | struct dln2_mod_rx_slots { |
| 83 | /* RX slots bitmap */ |
| 84 | DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS); |
| 85 | |
| 86 | /* used to wait for a free RX slot */ |
| 87 | wait_queue_head_t wq; |
| 88 | |
| 89 | /* used to wait for an RX operation to complete */ |
| 90 | struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS]; |
| 91 | |
| 92 | /* avoid races between alloc/free_rx_slot and dln2_rx_transfer */ |
| 93 | spinlock_t lock; |
| 94 | }; |
| 95 | |
Andy Shevchenko | ac703de | 2020-02-26 16:51:58 +0200 | [diff] [blame] | 96 | enum dln2_endpoint { |
| 97 | DLN2_EP_OUT = 0, |
| 98 | DLN2_EP_IN = 1, |
| 99 | }; |
| 100 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 101 | struct dln2_dev { |
| 102 | struct usb_device *usb_dev; |
| 103 | struct usb_interface *interface; |
| 104 | u8 ep_in; |
| 105 | u8 ep_out; |
| 106 | |
| 107 | struct urb *rx_urb[DLN2_MAX_URBS]; |
| 108 | void *rx_buf[DLN2_MAX_URBS]; |
| 109 | |
| 110 | struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; |
| 111 | |
| 112 | struct list_head event_cb_list; |
| 113 | spinlock_t event_cb_lock; |
| 114 | |
| 115 | bool disconnect; |
| 116 | int active_transfers; |
| 117 | wait_queue_head_t disconnect_wq; |
| 118 | spinlock_t disconnect_lock; |
| 119 | }; |
| 120 | |
| 121 | struct dln2_event_cb_entry { |
| 122 | struct list_head list; |
| 123 | u16 id; |
| 124 | struct platform_device *pdev; |
| 125 | dln2_event_cb_t callback; |
| 126 | }; |
| 127 | |
| 128 | int dln2_register_event_cb(struct platform_device *pdev, u16 id, |
| 129 | dln2_event_cb_t event_cb) |
| 130 | { |
| 131 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); |
| 132 | struct dln2_event_cb_entry *i, *entry; |
| 133 | unsigned long flags; |
| 134 | int ret = 0; |
| 135 | |
| 136 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 137 | if (!entry) |
| 138 | return -ENOMEM; |
| 139 | |
| 140 | entry->id = id; |
| 141 | entry->callback = event_cb; |
| 142 | entry->pdev = pdev; |
| 143 | |
| 144 | spin_lock_irqsave(&dln2->event_cb_lock, flags); |
| 145 | |
| 146 | list_for_each_entry(i, &dln2->event_cb_list, list) { |
| 147 | if (i->id == id) { |
| 148 | ret = -EBUSY; |
| 149 | break; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | if (!ret) |
| 154 | list_add_rcu(&entry->list, &dln2->event_cb_list); |
| 155 | |
| 156 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); |
| 157 | |
| 158 | if (ret) |
| 159 | kfree(entry); |
| 160 | |
| 161 | return ret; |
| 162 | } |
| 163 | EXPORT_SYMBOL(dln2_register_event_cb); |
| 164 | |
| 165 | void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) |
| 166 | { |
| 167 | struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); |
| 168 | struct dln2_event_cb_entry *i; |
| 169 | unsigned long flags; |
| 170 | bool found = false; |
| 171 | |
| 172 | spin_lock_irqsave(&dln2->event_cb_lock, flags); |
| 173 | |
| 174 | list_for_each_entry(i, &dln2->event_cb_list, list) { |
| 175 | if (i->id == id) { |
| 176 | list_del_rcu(&i->list); |
| 177 | found = true; |
| 178 | break; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | spin_unlock_irqrestore(&dln2->event_cb_lock, flags); |
| 183 | |
| 184 | if (found) { |
| 185 | synchronize_rcu(); |
| 186 | kfree(i); |
| 187 | } |
| 188 | } |
| 189 | EXPORT_SYMBOL(dln2_unregister_event_cb); |
| 190 | |
| 191 | /* |
| 192 | * Returns true if a valid transfer slot is found. In this case the URB must not |
| 193 | * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer |
| 194 | * is woke up. It will be resubmitted there. |
| 195 | */ |
| 196 | static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, |
| 197 | u16 handle, u16 rx_slot) |
| 198 | { |
| 199 | struct device *dev = &dln2->interface->dev; |
| 200 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
| 201 | struct dln2_rx_context *rxc; |
| 202 | bool valid_slot = false; |
| 203 | |
Octavian Purdila | 00ee7a3 | 2014-11-18 14:57:59 +0200 | [diff] [blame] | 204 | if (rx_slot >= DLN2_MAX_RX_SLOTS) |
| 205 | goto out; |
| 206 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 207 | rxc = &rxs->slots[rx_slot]; |
| 208 | |
| 209 | /* |
| 210 | * No need to disable interrupts as this lock is not taken in interrupt |
| 211 | * context elsewhere in this driver. This function (or its callers) are |
| 212 | * also not exported to other modules. |
| 213 | */ |
| 214 | spin_lock(&rxs->lock); |
| 215 | if (rxc->in_use && !rxc->urb) { |
| 216 | rxc->urb = urb; |
| 217 | complete(&rxc->done); |
| 218 | valid_slot = true; |
| 219 | } |
| 220 | spin_unlock(&rxs->lock); |
| 221 | |
Octavian Purdila | 00ee7a3 | 2014-11-18 14:57:59 +0200 | [diff] [blame] | 222 | out: |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 223 | if (!valid_slot) |
| 224 | dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); |
| 225 | |
| 226 | return valid_slot; |
| 227 | } |
| 228 | |
| 229 | static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, |
| 230 | void *data, int len) |
| 231 | { |
| 232 | struct dln2_event_cb_entry *i; |
| 233 | |
| 234 | rcu_read_lock(); |
| 235 | |
| 236 | list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { |
| 237 | if (i->id == id) { |
| 238 | i->callback(i->pdev, echo, data, len); |
| 239 | break; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | rcu_read_unlock(); |
| 244 | } |
| 245 | |
| 246 | static void dln2_rx(struct urb *urb) |
| 247 | { |
| 248 | struct dln2_dev *dln2 = urb->context; |
| 249 | struct dln2_header *hdr = urb->transfer_buffer; |
| 250 | struct device *dev = &dln2->interface->dev; |
| 251 | u16 id, echo, handle, size; |
| 252 | u8 *data; |
| 253 | int len; |
| 254 | int err; |
| 255 | |
| 256 | switch (urb->status) { |
| 257 | case 0: |
| 258 | /* success */ |
| 259 | break; |
| 260 | case -ECONNRESET: |
| 261 | case -ENOENT: |
| 262 | case -ESHUTDOWN: |
| 263 | case -EPIPE: |
| 264 | /* this urb is terminated, clean up */ |
| 265 | dev_dbg(dev, "urb shutting down with status %d\n", urb->status); |
| 266 | return; |
| 267 | default: |
| 268 | dev_dbg(dev, "nonzero urb status received %d\n", urb->status); |
| 269 | goto out; |
| 270 | } |
| 271 | |
| 272 | if (urb->actual_length < sizeof(struct dln2_header)) { |
| 273 | dev_err(dev, "short response: %d\n", urb->actual_length); |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | handle = le16_to_cpu(hdr->handle); |
| 278 | id = le16_to_cpu(hdr->id); |
| 279 | echo = le16_to_cpu(hdr->echo); |
| 280 | size = le16_to_cpu(hdr->size); |
| 281 | |
| 282 | if (size != urb->actual_length) { |
| 283 | dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", |
| 284 | handle, id, echo, size, urb->actual_length); |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | if (handle >= DLN2_HANDLES) { |
| 289 | dev_warn(dev, "invalid handle %d\n", handle); |
| 290 | goto out; |
| 291 | } |
| 292 | |
| 293 | data = urb->transfer_buffer + sizeof(struct dln2_header); |
| 294 | len = urb->actual_length - sizeof(struct dln2_header); |
| 295 | |
| 296 | if (handle == DLN2_HANDLE_EVENT) { |
| 297 | dln2_run_event_callbacks(dln2, id, echo, data, len); |
| 298 | } else { |
| 299 | /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ |
| 300 | if (dln2_transfer_complete(dln2, urb, handle, echo)) |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | out: |
| 305 | err = usb_submit_urb(urb, GFP_ATOMIC); |
| 306 | if (err < 0) |
| 307 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); |
| 308 | } |
| 309 | |
| 310 | static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, |
| 311 | int *obuf_len, gfp_t gfp) |
| 312 | { |
| 313 | int len; |
| 314 | void *buf; |
| 315 | struct dln2_header *hdr; |
| 316 | |
| 317 | len = *obuf_len + sizeof(*hdr); |
| 318 | buf = kmalloc(len, gfp); |
| 319 | if (!buf) |
| 320 | return NULL; |
| 321 | |
| 322 | hdr = (struct dln2_header *)buf; |
| 323 | hdr->id = cpu_to_le16(cmd); |
| 324 | hdr->size = cpu_to_le16(len); |
| 325 | hdr->echo = cpu_to_le16(echo); |
| 326 | hdr->handle = cpu_to_le16(handle); |
| 327 | |
| 328 | memcpy(buf + sizeof(*hdr), obuf, *obuf_len); |
| 329 | |
| 330 | *obuf_len = len; |
| 331 | |
| 332 | return buf; |
| 333 | } |
| 334 | |
| 335 | static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, |
| 336 | const void *obuf, int obuf_len) |
| 337 | { |
| 338 | int ret = 0; |
| 339 | int len = obuf_len; |
| 340 | void *buf; |
| 341 | int actual; |
| 342 | |
| 343 | buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); |
| 344 | if (!buf) |
| 345 | return -ENOMEM; |
| 346 | |
| 347 | ret = usb_bulk_msg(dln2->usb_dev, |
| 348 | usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), |
| 349 | buf, len, &actual, DLN2_USB_TIMEOUT); |
| 350 | |
| 351 | kfree(buf); |
| 352 | |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) |
| 357 | { |
| 358 | struct dln2_mod_rx_slots *rxs; |
| 359 | unsigned long flags; |
| 360 | |
| 361 | if (dln2->disconnect) { |
| 362 | *slot = -ENODEV; |
| 363 | return true; |
| 364 | } |
| 365 | |
| 366 | rxs = &dln2->mod_rx_slots[handle]; |
| 367 | |
| 368 | spin_lock_irqsave(&rxs->lock, flags); |
| 369 | |
| 370 | *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); |
| 371 | |
| 372 | if (*slot < DLN2_MAX_RX_SLOTS) { |
| 373 | struct dln2_rx_context *rxc = &rxs->slots[*slot]; |
| 374 | |
| 375 | set_bit(*slot, rxs->bmap); |
| 376 | rxc->in_use = true; |
| 377 | } |
| 378 | |
| 379 | spin_unlock_irqrestore(&rxs->lock, flags); |
| 380 | |
| 381 | return *slot < DLN2_MAX_RX_SLOTS; |
| 382 | } |
| 383 | |
| 384 | static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) |
| 385 | { |
| 386 | int ret; |
| 387 | int slot; |
| 388 | |
| 389 | /* |
| 390 | * No need to timeout here, the wait is bounded by the timeout in |
| 391 | * _dln2_transfer. |
| 392 | */ |
| 393 | ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, |
| 394 | find_free_slot(dln2, handle, &slot)); |
| 395 | if (ret < 0) |
| 396 | return ret; |
| 397 | |
| 398 | return slot; |
| 399 | } |
| 400 | |
| 401 | static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) |
| 402 | { |
| 403 | struct dln2_mod_rx_slots *rxs; |
| 404 | struct urb *urb = NULL; |
| 405 | unsigned long flags; |
| 406 | struct dln2_rx_context *rxc; |
| 407 | |
| 408 | rxs = &dln2->mod_rx_slots[handle]; |
| 409 | |
| 410 | spin_lock_irqsave(&rxs->lock, flags); |
| 411 | |
| 412 | clear_bit(slot, rxs->bmap); |
| 413 | |
| 414 | rxc = &rxs->slots[slot]; |
| 415 | rxc->in_use = false; |
| 416 | urb = rxc->urb; |
| 417 | rxc->urb = NULL; |
| 418 | reinit_completion(&rxc->done); |
| 419 | |
| 420 | spin_unlock_irqrestore(&rxs->lock, flags); |
| 421 | |
| 422 | if (urb) { |
| 423 | int err; |
| 424 | struct device *dev = &dln2->interface->dev; |
| 425 | |
| 426 | err = usb_submit_urb(urb, GFP_KERNEL); |
| 427 | if (err < 0) |
| 428 | dev_err(dev, "failed to resubmit RX URB: %d\n", err); |
| 429 | } |
| 430 | |
| 431 | wake_up_interruptible(&rxs->wq); |
| 432 | } |
| 433 | |
| 434 | static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, |
| 435 | const void *obuf, unsigned obuf_len, |
| 436 | void *ibuf, unsigned *ibuf_len) |
| 437 | { |
| 438 | int ret = 0; |
| 439 | int rx_slot; |
| 440 | struct dln2_response *rsp; |
| 441 | struct dln2_rx_context *rxc; |
| 442 | struct device *dev = &dln2->interface->dev; |
Nicholas Mc Guire | 48579a9 | 2015-03-16 11:20:49 -0400 | [diff] [blame] | 443 | const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 444 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
Dan Carpenter | 2fc2b48 | 2014-11-18 14:58:00 +0200 | [diff] [blame] | 445 | int size; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 446 | |
| 447 | spin_lock(&dln2->disconnect_lock); |
| 448 | if (!dln2->disconnect) |
| 449 | dln2->active_transfers++; |
| 450 | else |
| 451 | ret = -ENODEV; |
| 452 | spin_unlock(&dln2->disconnect_lock); |
| 453 | |
| 454 | if (ret) |
| 455 | return ret; |
| 456 | |
| 457 | rx_slot = alloc_rx_slot(dln2, handle); |
| 458 | if (rx_slot < 0) { |
| 459 | ret = rx_slot; |
| 460 | goto out_decr; |
| 461 | } |
| 462 | |
| 463 | ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); |
| 464 | if (ret < 0) { |
| 465 | dev_err(dev, "USB write failed: %d\n", ret); |
| 466 | goto out_free_rx_slot; |
| 467 | } |
| 468 | |
| 469 | rxc = &rxs->slots[rx_slot]; |
| 470 | |
| 471 | ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); |
| 472 | if (ret <= 0) { |
| 473 | if (!ret) |
| 474 | ret = -ETIMEDOUT; |
| 475 | goto out_free_rx_slot; |
Octavian Purdila | 7ca2b1c | 2014-11-18 14:57:57 +0200 | [diff] [blame] | 476 | } else { |
| 477 | ret = 0; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | if (dln2->disconnect) { |
| 481 | ret = -ENODEV; |
| 482 | goto out_free_rx_slot; |
| 483 | } |
| 484 | |
| 485 | /* if we got here we know that the response header has been checked */ |
| 486 | rsp = rxc->urb->transfer_buffer; |
Dan Carpenter | 2fc2b48 | 2014-11-18 14:58:00 +0200 | [diff] [blame] | 487 | size = le16_to_cpu(rsp->hdr.size); |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 488 | |
Dan Carpenter | 2fc2b48 | 2014-11-18 14:58:00 +0200 | [diff] [blame] | 489 | if (size < sizeof(*rsp)) { |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 490 | ret = -EPROTO; |
| 491 | goto out_free_rx_slot; |
| 492 | } |
| 493 | |
| 494 | if (le16_to_cpu(rsp->result) > 0x80) { |
| 495 | dev_dbg(dev, "%d received response with error %d\n", |
| 496 | handle, le16_to_cpu(rsp->result)); |
| 497 | ret = -EREMOTEIO; |
| 498 | goto out_free_rx_slot; |
| 499 | } |
| 500 | |
Octavian Purdila | 7ca2b1c | 2014-11-18 14:57:57 +0200 | [diff] [blame] | 501 | if (!ibuf) |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 502 | goto out_free_rx_slot; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 503 | |
Dan Carpenter | 2fc2b48 | 2014-11-18 14:58:00 +0200 | [diff] [blame] | 504 | if (*ibuf_len > size - sizeof(*rsp)) |
| 505 | *ibuf_len = size - sizeof(*rsp); |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 506 | |
| 507 | memcpy(ibuf, rsp + 1, *ibuf_len); |
| 508 | |
| 509 | out_free_rx_slot: |
| 510 | free_rx_slot(dln2, handle, rx_slot); |
| 511 | out_decr: |
| 512 | spin_lock(&dln2->disconnect_lock); |
| 513 | dln2->active_transfers--; |
| 514 | spin_unlock(&dln2->disconnect_lock); |
| 515 | if (dln2->disconnect) |
| 516 | wake_up(&dln2->disconnect_wq); |
| 517 | |
| 518 | return ret; |
| 519 | } |
| 520 | |
| 521 | int dln2_transfer(struct platform_device *pdev, u16 cmd, |
| 522 | const void *obuf, unsigned obuf_len, |
| 523 | void *ibuf, unsigned *ibuf_len) |
| 524 | { |
| 525 | struct dln2_platform_data *dln2_pdata; |
| 526 | struct dln2_dev *dln2; |
| 527 | u16 handle; |
| 528 | |
| 529 | dln2 = dev_get_drvdata(pdev->dev.parent); |
| 530 | dln2_pdata = dev_get_platdata(&pdev->dev); |
| 531 | handle = dln2_pdata->handle; |
| 532 | |
| 533 | return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, |
| 534 | ibuf_len); |
| 535 | } |
| 536 | EXPORT_SYMBOL(dln2_transfer); |
| 537 | |
| 538 | static int dln2_check_hw(struct dln2_dev *dln2) |
| 539 | { |
| 540 | int ret; |
| 541 | __le32 hw_type; |
| 542 | int len = sizeof(hw_type); |
| 543 | |
| 544 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, |
| 545 | NULL, 0, &hw_type, &len); |
| 546 | if (ret < 0) |
| 547 | return ret; |
| 548 | if (len < sizeof(hw_type)) |
| 549 | return -EREMOTEIO; |
| 550 | |
| 551 | if (le32_to_cpu(hw_type) != DLN2_HW_ID) { |
| 552 | dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", |
| 553 | le32_to_cpu(hw_type)); |
| 554 | return -ENODEV; |
| 555 | } |
| 556 | |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | static int dln2_print_serialno(struct dln2_dev *dln2) |
| 561 | { |
| 562 | int ret; |
| 563 | __le32 serial_no; |
| 564 | int len = sizeof(serial_no); |
| 565 | struct device *dev = &dln2->interface->dev; |
| 566 | |
| 567 | ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, |
| 568 | &serial_no, &len); |
| 569 | if (ret < 0) |
| 570 | return ret; |
| 571 | if (len < sizeof(serial_no)) |
| 572 | return -EREMOTEIO; |
| 573 | |
| 574 | dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); |
| 575 | |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static int dln2_hw_init(struct dln2_dev *dln2) |
| 580 | { |
| 581 | int ret; |
| 582 | |
| 583 | ret = dln2_check_hw(dln2); |
| 584 | if (ret < 0) |
| 585 | return ret; |
| 586 | |
| 587 | return dln2_print_serialno(dln2); |
| 588 | } |
| 589 | |
| 590 | static void dln2_free_rx_urbs(struct dln2_dev *dln2) |
| 591 | { |
| 592 | int i; |
| 593 | |
| 594 | for (i = 0; i < DLN2_MAX_URBS; i++) { |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 595 | usb_free_urb(dln2->rx_urb[i]); |
| 596 | kfree(dln2->rx_buf[i]); |
| 597 | } |
| 598 | } |
| 599 | |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 600 | static void dln2_stop_rx_urbs(struct dln2_dev *dln2) |
| 601 | { |
| 602 | int i; |
| 603 | |
| 604 | for (i = 0; i < DLN2_MAX_URBS; i++) |
| 605 | usb_kill_urb(dln2->rx_urb[i]); |
| 606 | } |
| 607 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 608 | static void dln2_free(struct dln2_dev *dln2) |
| 609 | { |
| 610 | dln2_free_rx_urbs(dln2); |
| 611 | usb_put_dev(dln2->usb_dev); |
| 612 | kfree(dln2); |
| 613 | } |
| 614 | |
| 615 | static int dln2_setup_rx_urbs(struct dln2_dev *dln2, |
| 616 | struct usb_host_interface *hostif) |
| 617 | { |
| 618 | int i; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 619 | const int rx_max_size = DLN2_RX_BUF_SIZE; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 620 | |
| 621 | for (i = 0; i < DLN2_MAX_URBS; i++) { |
| 622 | dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); |
| 623 | if (!dln2->rx_buf[i]) |
| 624 | return -ENOMEM; |
| 625 | |
| 626 | dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); |
| 627 | if (!dln2->rx_urb[i]) |
| 628 | return -ENOMEM; |
| 629 | |
| 630 | usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, |
| 631 | usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), |
| 632 | dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 633 | } |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 634 | |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) |
| 639 | { |
| 640 | struct device *dev = &dln2->interface->dev; |
| 641 | int ret; |
| 642 | int i; |
| 643 | |
| 644 | for (i = 0; i < DLN2_MAX_URBS; i++) { |
| 645 | ret = usb_submit_urb(dln2->rx_urb[i], gfp); |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 646 | if (ret < 0) { |
| 647 | dev_err(dev, "failed to submit RX URB: %d\n", ret); |
| 648 | return ret; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static struct dln2_platform_data dln2_pdata_gpio = { |
| 656 | .handle = DLN2_HANDLE_GPIO, |
| 657 | }; |
| 658 | |
| 659 | /* Only one I2C port seems to be supported on current hardware */ |
| 660 | static struct dln2_platform_data dln2_pdata_i2c = { |
| 661 | .handle = DLN2_HANDLE_I2C, |
| 662 | .port = 0, |
| 663 | }; |
| 664 | |
Laurentiu Palcu | 21cf331 | 2014-11-07 14:45:14 +0200 | [diff] [blame] | 665 | /* Only one SPI port supported */ |
| 666 | static struct dln2_platform_data dln2_pdata_spi = { |
| 667 | .handle = DLN2_HANDLE_SPI, |
| 668 | .port = 0, |
| 669 | }; |
| 670 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 671 | static const struct mfd_cell dln2_devs[] = { |
| 672 | { |
| 673 | .name = "dln2-gpio", |
| 674 | .platform_data = &dln2_pdata_gpio, |
| 675 | .pdata_size = sizeof(struct dln2_platform_data), |
| 676 | }, |
| 677 | { |
| 678 | .name = "dln2-i2c", |
| 679 | .platform_data = &dln2_pdata_i2c, |
| 680 | .pdata_size = sizeof(struct dln2_platform_data), |
| 681 | }, |
Laurentiu Palcu | 21cf331 | 2014-11-07 14:45:14 +0200 | [diff] [blame] | 682 | { |
| 683 | .name = "dln2-spi", |
| 684 | .platform_data = &dln2_pdata_spi, |
| 685 | .pdata_size = sizeof(struct dln2_platform_data), |
| 686 | }, |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 687 | }; |
| 688 | |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 689 | static void dln2_stop(struct dln2_dev *dln2) |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 690 | { |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 691 | int i, j; |
| 692 | |
| 693 | /* don't allow starting new transfers */ |
| 694 | spin_lock(&dln2->disconnect_lock); |
| 695 | dln2->disconnect = true; |
| 696 | spin_unlock(&dln2->disconnect_lock); |
| 697 | |
| 698 | /* cancel in progress transfers */ |
| 699 | for (i = 0; i < DLN2_HANDLES; i++) { |
| 700 | struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; |
| 701 | unsigned long flags; |
| 702 | |
| 703 | spin_lock_irqsave(&rxs->lock, flags); |
| 704 | |
| 705 | /* cancel all response waiters */ |
| 706 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { |
| 707 | struct dln2_rx_context *rxc = &rxs->slots[j]; |
| 708 | |
| 709 | if (rxc->in_use) |
| 710 | complete(&rxc->done); |
| 711 | } |
| 712 | |
| 713 | spin_unlock_irqrestore(&rxs->lock, flags); |
| 714 | } |
| 715 | |
| 716 | /* wait for transfers to end */ |
| 717 | wait_event(dln2->disconnect_wq, !dln2->active_transfers); |
| 718 | |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 719 | dln2_stop_rx_urbs(dln2); |
| 720 | } |
| 721 | |
| 722 | static void dln2_disconnect(struct usb_interface *interface) |
| 723 | { |
| 724 | struct dln2_dev *dln2 = usb_get_intfdata(interface); |
| 725 | |
| 726 | dln2_stop(dln2); |
| 727 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 728 | mfd_remove_devices(&interface->dev); |
| 729 | |
| 730 | dln2_free(dln2); |
| 731 | } |
| 732 | |
| 733 | static int dln2_probe(struct usb_interface *interface, |
| 734 | const struct usb_device_id *usb_id) |
| 735 | { |
| 736 | struct usb_host_interface *hostif = interface->cur_altsetting; |
Oliver Neukum | 2b8aa1b | 2019-11-21 11:28:10 +0100 | [diff] [blame] | 737 | struct usb_endpoint_descriptor *epin; |
| 738 | struct usb_endpoint_descriptor *epout; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 739 | struct device *dev = &interface->dev; |
| 740 | struct dln2_dev *dln2; |
| 741 | int ret; |
| 742 | int i, j; |
| 743 | |
| 744 | if (hostif->desc.bInterfaceNumber != 0 || |
| 745 | hostif->desc.bNumEndpoints < 2) |
| 746 | return -ENODEV; |
| 747 | |
Andy Shevchenko | ac703de | 2020-02-26 16:51:58 +0200 | [diff] [blame] | 748 | epout = &hostif->endpoint[DLN2_EP_OUT].desc; |
Oliver Neukum | 2b8aa1b | 2019-11-21 11:28:10 +0100 | [diff] [blame] | 749 | if (!usb_endpoint_is_bulk_out(epout)) |
| 750 | return -ENODEV; |
Andy Shevchenko | ac703de | 2020-02-26 16:51:58 +0200 | [diff] [blame] | 751 | epin = &hostif->endpoint[DLN2_EP_IN].desc; |
Oliver Neukum | 2b8aa1b | 2019-11-21 11:28:10 +0100 | [diff] [blame] | 752 | if (!usb_endpoint_is_bulk_in(epin)) |
| 753 | return -ENODEV; |
| 754 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 755 | dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); |
| 756 | if (!dln2) |
| 757 | return -ENOMEM; |
| 758 | |
Oliver Neukum | 2b8aa1b | 2019-11-21 11:28:10 +0100 | [diff] [blame] | 759 | dln2->ep_out = epout->bEndpointAddress; |
| 760 | dln2->ep_in = epin->bEndpointAddress; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 761 | dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); |
| 762 | dln2->interface = interface; |
| 763 | usb_set_intfdata(interface, dln2); |
| 764 | init_waitqueue_head(&dln2->disconnect_wq); |
| 765 | |
| 766 | for (i = 0; i < DLN2_HANDLES; i++) { |
| 767 | init_waitqueue_head(&dln2->mod_rx_slots[i].wq); |
| 768 | spin_lock_init(&dln2->mod_rx_slots[i].lock); |
| 769 | for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) |
| 770 | init_completion(&dln2->mod_rx_slots[i].slots[j].done); |
| 771 | } |
| 772 | |
| 773 | spin_lock_init(&dln2->event_cb_lock); |
| 774 | spin_lock_init(&dln2->disconnect_lock); |
| 775 | INIT_LIST_HEAD(&dln2->event_cb_list); |
| 776 | |
| 777 | ret = dln2_setup_rx_urbs(dln2, hostif); |
| 778 | if (ret) |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 779 | goto out_free; |
| 780 | |
| 781 | ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); |
| 782 | if (ret) |
| 783 | goto out_stop_rx; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 784 | |
| 785 | ret = dln2_hw_init(dln2); |
| 786 | if (ret < 0) { |
| 787 | dev_err(dev, "failed to initialize hardware\n"); |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 788 | goto out_stop_rx; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); |
| 792 | if (ret != 0) { |
| 793 | dev_err(dev, "failed to add mfd devices to core\n"); |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 794 | goto out_stop_rx; |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | return 0; |
| 798 | |
Octavian Purdila | ee231ae | 2015-01-19 13:51:35 +0200 | [diff] [blame] | 799 | out_stop_rx: |
| 800 | dln2_stop_rx_urbs(dln2); |
| 801 | |
| 802 | out_free: |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 803 | dln2_free(dln2); |
| 804 | |
| 805 | return ret; |
| 806 | } |
| 807 | |
Octavian Purdila | 3daa122 | 2015-01-19 13:51:36 +0200 | [diff] [blame] | 808 | static int dln2_suspend(struct usb_interface *iface, pm_message_t message) |
| 809 | { |
| 810 | struct dln2_dev *dln2 = usb_get_intfdata(iface); |
| 811 | |
| 812 | dln2_stop(dln2); |
| 813 | |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | static int dln2_resume(struct usb_interface *iface) |
| 818 | { |
| 819 | struct dln2_dev *dln2 = usb_get_intfdata(iface); |
| 820 | |
| 821 | dln2->disconnect = false; |
| 822 | |
| 823 | return dln2_start_rx_urbs(dln2, GFP_NOIO); |
| 824 | } |
| 825 | |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 826 | static const struct usb_device_id dln2_table[] = { |
| 827 | { USB_DEVICE(0xa257, 0x2013) }, |
| 828 | { } |
| 829 | }; |
| 830 | |
| 831 | MODULE_DEVICE_TABLE(usb, dln2_table); |
| 832 | |
| 833 | static struct usb_driver dln2_driver = { |
| 834 | .name = "dln2", |
| 835 | .probe = dln2_probe, |
| 836 | .disconnect = dln2_disconnect, |
| 837 | .id_table = dln2_table, |
Octavian Purdila | 3daa122 | 2015-01-19 13:51:36 +0200 | [diff] [blame] | 838 | .suspend = dln2_suspend, |
| 839 | .resume = dln2_resume, |
Octavian Purdila | 338a128 | 2014-11-06 15:48:03 +0200 | [diff] [blame] | 840 | }; |
| 841 | |
| 842 | module_usb_driver(dln2_driver); |
| 843 | |
| 844 | MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); |
| 845 | MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); |
| 846 | MODULE_LICENSE("GPL v2"); |