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TOMOYO Linux Cross Reference
Linux/sound/pci/asihpi/hpioctl.c

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  1 /*******************************************************************************
  2 
  3     AudioScience HPI driver
  4     Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>
  5 
  6     This program is free software; you can redistribute it and/or modify
  7     it under the terms of version 2 of the GNU General Public License as
  8     published by the Free Software Foundation;
  9 
 10     This program is distributed in the hope that it will be useful,
 11     but WITHOUT ANY WARRANTY; without even the implied warranty of
 12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13     GNU General Public License for more details.
 14 
 15     You should have received a copy of the GNU General Public License
 16     along with this program; if not, write to the Free Software
 17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 18 
 19 Common Linux HPI ioctl and module probe/remove functions
 20 *******************************************************************************/
 21 #define SOURCEFILE_NAME "hpioctl.c"
 22 
 23 #include "hpi_internal.h"
 24 #include "hpi_version.h"
 25 #include "hpimsginit.h"
 26 #include "hpidebug.h"
 27 #include "hpimsgx.h"
 28 #include "hpioctl.h"
 29 #include "hpicmn.h"
 30 
 31 #include <linux/fs.h>
 32 #include <linux/slab.h>
 33 #include <linux/moduleparam.h>
 34 #include <asm/uaccess.h>
 35 #include <linux/pci.h>
 36 #include <linux/stringify.h>
 37 #include <linux/module.h>
 38 
 39 #ifdef MODULE_FIRMWARE
 40 MODULE_FIRMWARE("asihpi/dsp5000.bin");
 41 MODULE_FIRMWARE("asihpi/dsp6200.bin");
 42 MODULE_FIRMWARE("asihpi/dsp6205.bin");
 43 MODULE_FIRMWARE("asihpi/dsp6400.bin");
 44 MODULE_FIRMWARE("asihpi/dsp6600.bin");
 45 MODULE_FIRMWARE("asihpi/dsp8700.bin");
 46 MODULE_FIRMWARE("asihpi/dsp8900.bin");
 47 #endif
 48 
 49 static int prealloc_stream_buf;
 50 module_param(prealloc_stream_buf, int, S_IRUGO);
 51 MODULE_PARM_DESC(prealloc_stream_buf,
 52         "Preallocate size for per-adapter stream buffer");
 53 
 54 /* Allow the debug level to be changed after module load.
 55  E.g.   echo 2 > /sys/module/asihpi/parameters/hpiDebugLevel
 56 */
 57 module_param(hpi_debug_level, int, S_IRUGO | S_IWUSR);
 58 MODULE_PARM_DESC(hpi_debug_level, "debug verbosity 0..5");
 59 
 60 /* List of adapters found */
 61 static struct hpi_adapter adapters[HPI_MAX_ADAPTERS];
 62 
 63 /* Wrapper function to HPI_Message to enable dumping of the
 64    message and response types.
 65 */
 66 static void hpi_send_recv_f(struct hpi_message *phm, struct hpi_response *phr,
 67         struct file *file)
 68 {
 69         if ((phm->adapter_index >= HPI_MAX_ADAPTERS)
 70                 && (phm->object != HPI_OBJ_SUBSYSTEM))
 71                 phr->error = HPI_ERROR_INVALID_OBJ_INDEX;
 72         else
 73                 hpi_send_recv_ex(phm, phr, file);
 74 }
 75 
 76 /* This is called from hpifunc.c functions, called by ALSA
 77  * (or other kernel process) In this case there is no file descriptor
 78  * available for the message cache code
 79  */
 80 void hpi_send_recv(struct hpi_message *phm, struct hpi_response *phr)
 81 {
 82         hpi_send_recv_f(phm, phr, HOWNER_KERNEL);
 83 }
 84 
 85 EXPORT_SYMBOL(hpi_send_recv);
 86 /* for radio-asihpi */
 87 
 88 int asihpi_hpi_release(struct file *file)
 89 {
 90         struct hpi_message hm;
 91         struct hpi_response hr;
 92 
 93 /* HPI_DEBUG_LOG(INFO,"hpi_release file %p, pid %d\n", file, current->pid); */
 94         /* close the subsystem just in case the application forgot to. */
 95         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 96                 HPI_SUBSYS_CLOSE);
 97         hpi_send_recv_ex(&hm, &hr, file);
 98         return 0;
 99 }
100 
101 long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
102 {
103         struct hpi_ioctl_linux __user *phpi_ioctl_data;
104         void __user *puhm;
105         void __user *puhr;
106         union hpi_message_buffer_v1 *hm;
107         union hpi_response_buffer_v1 *hr;
108         u16 res_max_size;
109         u32 uncopied_bytes;
110         int err = 0;
111 
112         if (cmd != HPI_IOCTL_LINUX)
113                 return -EINVAL;
114 
115         hm = kmalloc(sizeof(*hm), GFP_KERNEL);
116         hr = kmalloc(sizeof(*hr), GFP_KERNEL);
117         if (!hm || !hr) {
118                 err = -ENOMEM;
119                 goto out;
120         }
121 
122         phpi_ioctl_data = (struct hpi_ioctl_linux __user *)arg;
123 
124         /* Read the message and response pointers from user space.  */
125         if (get_user(puhm, &phpi_ioctl_data->phm)
126                 || get_user(puhr, &phpi_ioctl_data->phr)) {
127                 err = -EFAULT;
128                 goto out;
129         }
130 
131         /* Now read the message size and data from user space.  */
132         if (get_user(hm->h.size, (u16 __user *)puhm)) {
133                 err = -EFAULT;
134                 goto out;
135         }
136         if (hm->h.size > sizeof(*hm))
137                 hm->h.size = sizeof(*hm);
138 
139         /* printk(KERN_INFO "message size %d\n", hm->h.wSize); */
140 
141         uncopied_bytes = copy_from_user(hm, puhm, hm->h.size);
142         if (uncopied_bytes) {
143                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
144                 err = -EFAULT;
145                 goto out;
146         }
147 
148         if (get_user(res_max_size, (u16 __user *)puhr)) {
149                 err = -EFAULT;
150                 goto out;
151         }
152         /* printk(KERN_INFO "user response size %d\n", res_max_size); */
153         if (res_max_size < sizeof(struct hpi_response_header)) {
154                 HPI_DEBUG_LOG(WARNING, "small res size %d\n", res_max_size);
155                 err = -EFAULT;
156                 goto out;
157         }
158 
159         switch (hm->h.function) {
160         case HPI_SUBSYS_CREATE_ADAPTER:
161         case HPI_ADAPTER_DELETE:
162                 /* Application must not use these functions! */
163                 hr->h.size = sizeof(hr->h);
164                 hr->h.error = HPI_ERROR_INVALID_OPERATION;
165                 hr->h.function = hm->h.function;
166                 uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
167                 if (uncopied_bytes)
168                         err = -EFAULT;
169                 else
170                         err = 0;
171                 goto out;
172         }
173 
174         hr->h.size = res_max_size;
175         if (hm->h.object == HPI_OBJ_SUBSYSTEM) {
176                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
177         } else {
178                 u16 __user *ptr = NULL;
179                 u32 size = 0;
180                 /* -1=no data 0=read from user mem, 1=write to user mem */
181                 int wrflag = -1;
182                 struct hpi_adapter *pa = NULL;
183 
184                 if (hm->h.adapter_index < ARRAY_SIZE(adapters))
185                         pa = &adapters[hm->h.adapter_index];
186 
187                 if (!pa || !pa->adapter || !pa->adapter->type) {
188                         hpi_init_response(&hr->r0, hm->h.object,
189                                 hm->h.function, HPI_ERROR_BAD_ADAPTER_NUMBER);
190 
191                         uncopied_bytes =
192                                 copy_to_user(puhr, hr, sizeof(hr->h));
193                         if (uncopied_bytes)
194                                 err = -EFAULT;
195                         else
196                                 err = 0;
197                         goto out;
198                 }
199 
200                 if (mutex_lock_interruptible(&pa->mutex)) {
201                         err = -EINTR;
202                         goto out;
203                 }
204 
205                 /* Dig out any pointers embedded in the message.  */
206                 switch (hm->h.function) {
207                 case HPI_OSTREAM_WRITE:
208                 case HPI_ISTREAM_READ:{
209                                 /* Yes, sparse, this is correct. */
210                                 ptr = (u16 __user *)hm->m0.u.d.u.data.pb_data;
211                                 size = hm->m0.u.d.u.data.data_size;
212 
213                                 /* Allocate buffer according to application request.
214                                    ?Is it better to alloc/free for the duration
215                                    of the transaction?
216                                  */
217                                 if (pa->buffer_size < size) {
218                                         HPI_DEBUG_LOG(DEBUG,
219                                                 "Realloc adapter %d stream "
220                                                 "buffer from %zd to %d\n",
221                                                 hm->h.adapter_index,
222                                                 pa->buffer_size, size);
223                                         if (pa->p_buffer) {
224                                                 pa->buffer_size = 0;
225                                                 vfree(pa->p_buffer);
226                                         }
227                                         pa->p_buffer = vmalloc(size);
228                                         if (pa->p_buffer)
229                                                 pa->buffer_size = size;
230                                         else {
231                                                 HPI_DEBUG_LOG(ERROR,
232                                                         "HPI could not allocate "
233                                                         "stream buffer size %d\n",
234                                                         size);
235 
236                                                 mutex_unlock(&pa->mutex);
237                                                 err = -EINVAL;
238                                                 goto out;
239                                         }
240                                 }
241 
242                                 hm->m0.u.d.u.data.pb_data = pa->p_buffer;
243                                 if (hm->h.function == HPI_ISTREAM_READ)
244                                         /* from card, WRITE to user mem */
245                                         wrflag = 1;
246                                 else
247                                         wrflag = 0;
248                                 break;
249                         }
250 
251                 default:
252                         size = 0;
253                         break;
254                 }
255 
256                 if (size && (wrflag == 0)) {
257                         uncopied_bytes =
258                                 copy_from_user(pa->p_buffer, ptr, size);
259                         if (uncopied_bytes)
260                                 HPI_DEBUG_LOG(WARNING,
261                                         "Missed %d of %d "
262                                         "bytes from user\n", uncopied_bytes,
263                                         size);
264                 }
265 
266                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
267 
268                 if (size && (wrflag == 1)) {
269                         uncopied_bytes =
270                                 copy_to_user(ptr, pa->p_buffer, size);
271                         if (uncopied_bytes)
272                                 HPI_DEBUG_LOG(WARNING,
273                                         "Missed %d of %d " "bytes to user\n",
274                                         uncopied_bytes, size);
275                 }
276 
277                 mutex_unlock(&pa->mutex);
278         }
279 
280         /* on return response size must be set */
281         /*printk(KERN_INFO "response size %d\n", hr->h.wSize); */
282 
283         if (!hr->h.size) {
284                 HPI_DEBUG_LOG(ERROR, "response zero size\n");
285                 err = -EFAULT;
286                 goto out;
287         }
288 
289         if (hr->h.size > res_max_size) {
290                 HPI_DEBUG_LOG(ERROR, "response too big %d %d\n", hr->h.size,
291                         res_max_size);
292                 hr->h.error = HPI_ERROR_RESPONSE_BUFFER_TOO_SMALL;
293                 hr->h.specific_error = hr->h.size;
294                 hr->h.size = sizeof(hr->h);
295         }
296 
297         uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
298         if (uncopied_bytes) {
299                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
300                 err = -EFAULT;
301                 goto out;
302         }
303 
304 out:
305         kfree(hm);
306         kfree(hr);
307         return err;
308 }
309 
310 int asihpi_adapter_probe(struct pci_dev *pci_dev,
311                          const struct pci_device_id *pci_id)
312 {
313         int idx, nm;
314         int adapter_index;
315         unsigned int memlen;
316         struct hpi_message hm;
317         struct hpi_response hr;
318         struct hpi_adapter adapter;
319         struct hpi_pci pci;
320 
321         memset(&adapter, 0, sizeof(adapter));
322 
323         dev_printk(KERN_DEBUG, &pci_dev->dev,
324                 "probe %04x:%04x,%04x:%04x,%04x\n", pci_dev->vendor,
325                 pci_dev->device, pci_dev->subsystem_vendor,
326                 pci_dev->subsystem_device, pci_dev->devfn);
327 
328         if (pci_enable_device(pci_dev) < 0) {
329                 dev_err(&pci_dev->dev,
330                         "pci_enable_device failed, disabling device\n");
331                 return -EIO;
332         }
333 
334         pci_set_master(pci_dev);        /* also sets latency timer if < 16 */
335 
336         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
337                 HPI_SUBSYS_CREATE_ADAPTER);
338         hpi_init_response(&hr, HPI_OBJ_SUBSYSTEM, HPI_SUBSYS_CREATE_ADAPTER,
339                 HPI_ERROR_PROCESSING_MESSAGE);
340 
341         hm.adapter_index = HPI_ADAPTER_INDEX_INVALID;
342 
343         nm = HPI_MAX_ADAPTER_MEM_SPACES;
344 
345         for (idx = 0; idx < nm; idx++) {
346                 HPI_DEBUG_LOG(INFO, "resource %d %pR\n", idx,
347                         &pci_dev->resource[idx]);
348 
349                 if (pci_resource_flags(pci_dev, idx) & IORESOURCE_MEM) {
350                         memlen = pci_resource_len(pci_dev, idx);
351                         pci.ap_mem_base[idx] =
352                                 ioremap(pci_resource_start(pci_dev, idx),
353                                 memlen);
354                         if (!pci.ap_mem_base[idx]) {
355                                 HPI_DEBUG_LOG(ERROR,
356                                         "ioremap failed, aborting\n");
357                                 /* unmap previously mapped pci mem space */
358                                 goto err;
359                         }
360                 }
361         }
362 
363         pci.pci_dev = pci_dev;
364         hm.u.s.resource.bus_type = HPI_BUS_PCI;
365         hm.u.s.resource.r.pci = &pci;
366 
367         /* call CreateAdapterObject on the relevant hpi module */
368         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
369         if (hr.error)
370                 goto err;
371 
372         adapter_index = hr.u.s.adapter_index;
373         adapter.adapter = hpi_find_adapter(adapter_index);
374 
375         if (prealloc_stream_buf) {
376                 adapter.p_buffer = vmalloc(prealloc_stream_buf);
377                 if (!adapter.p_buffer) {
378                         HPI_DEBUG_LOG(ERROR,
379                                 "HPI could not allocate "
380                                 "kernel buffer size %d\n",
381                                 prealloc_stream_buf);
382                         goto err;
383                 }
384         }
385 
386         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
387                 HPI_ADAPTER_OPEN);
388         hm.adapter_index = adapter.adapter->index;
389         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
390 
391         if (hr.error)
392                 goto err;
393 
394         /* WARNING can't init mutex in 'adapter'
395          * and then copy it to adapters[] ?!?!
396          */
397         adapters[adapter_index] = adapter;
398         mutex_init(&adapters[adapter_index].mutex);
399         pci_set_drvdata(pci_dev, &adapters[adapter_index]);
400 
401         dev_info(&pci_dev->dev, "probe succeeded for ASI%04X HPI index %d\n",
402                  adapter.adapter->type, adapter_index);
403 
404         return 0;
405 
406 err:
407         for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; idx++) {
408                 if (pci.ap_mem_base[idx]) {
409                         iounmap(pci.ap_mem_base[idx]);
410                         pci.ap_mem_base[idx] = NULL;
411                 }
412         }
413 
414         if (adapter.p_buffer) {
415                 adapter.buffer_size = 0;
416                 vfree(adapter.p_buffer);
417         }
418 
419         HPI_DEBUG_LOG(ERROR, "adapter_probe failed\n");
420         return -ENODEV;
421 }
422 
423 void asihpi_adapter_remove(struct pci_dev *pci_dev)
424 {
425         int idx;
426         struct hpi_message hm;
427         struct hpi_response hr;
428         struct hpi_adapter *pa;
429         struct hpi_pci pci;
430 
431         pa = pci_get_drvdata(pci_dev);
432         pci = pa->adapter->pci;
433 
434         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
435                 HPI_ADAPTER_DELETE);
436         hm.adapter_index = pa->adapter->index;
437         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
438 
439         /* unmap PCI memory space, mapped during device init. */
440         for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; idx++) {
441                 if (pci.ap_mem_base[idx])
442                         iounmap(pci.ap_mem_base[idx]);
443         }
444 
445         if (pa->p_buffer)
446                 vfree(pa->p_buffer);
447 
448         if (1)
449                 dev_info(&pci_dev->dev,
450                          "remove %04x:%04x,%04x:%04x,%04x, HPI index %d\n",
451                          pci_dev->vendor, pci_dev->device,
452                          pci_dev->subsystem_vendor, pci_dev->subsystem_device,
453                          pci_dev->devfn, pa->adapter->index);
454 
455         memset(pa, 0, sizeof(*pa));
456 }
457 
458 void __init asihpi_init(void)
459 {
460         struct hpi_message hm;
461         struct hpi_response hr;
462 
463         memset(adapters, 0, sizeof(adapters));
464 
465         printk(KERN_INFO "ASIHPI driver " HPI_VER_STRING "\n");
466 
467         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
468                 HPI_SUBSYS_DRIVER_LOAD);
469         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
470 }
471 
472 void asihpi_exit(void)
473 {
474         struct hpi_message hm;
475         struct hpi_response hr;
476 
477         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
478                 HPI_SUBSYS_DRIVER_UNLOAD);
479         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
480 }
481 

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