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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / ccg / storage_common.c
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e220ff75
SAS		 1/*
2 * storage_common.c -- Common definitions for mass storage functionality
3 *
4 * Copyright (C) 2003-2008 Alan Stern
5 * Copyeight (C) 2009 Samsung Electronics
6 * Author: Michal Nazarewicz (mina86@mina86.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14
15/*
16 * This file requires the following identifiers used in USB strings to
17 * be defined (each of type pointer to char):
18 * - fsg_string_manufacturer -- name of the manufacturer
19 * - fsg_string_product -- name of the product
20 * - fsg_string_config -- name of the configuration
21 * - fsg_string_interface -- name of the interface
22 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
23 * macro is defined prior to including this file.
24 */
25
26/*
27 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
28 * fsg_hs_intr_in_desc objects as well as
29 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
30 * macros are not defined.
31 *
32 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
33 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
34 * defined (as well as corresponding entries in string tables are
35 * missing) and FSG_STRING_INTERFACE has value of zero.
36 *
37 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
38 */
39
40/*
41 * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers
42 * sets the number of pipeline buffers (length of the fsg_buffhd array).
43 * The valid range of num_buffers is: num >= 2 && num <= 4.
44 */
45
46
47#include <linux/usb/storage.h>
48#include <scsi/scsi.h>
49#include <asm/unaligned.h>
50
51
52/*
53 * Thanks to NetChip Technologies for donating this product ID.
54 *
55 * DO NOT REUSE THESE IDs with any other driver!! Ever!!
56 * Instead: allocate your own, using normal USB-IF procedures.
57 */
58#define FSG_VENDOR_ID 0x0525 /* NetChip */
59#define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
60
61
62/*-------------------------------------------------------------------------*/
63
64
65#ifndef DEBUG
66#undef VERBOSE_DEBUG
67#undef DUMP_MSGS
68#endif /* !DEBUG */
69
70#ifdef VERBOSE_DEBUG
71#define VLDBG LDBG
72#else
73#define VLDBG(lun, fmt, args...) do { } while (0)
74#endif /* VERBOSE_DEBUG */
75
76#define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
77#define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
78#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
79#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
80
81/*
82 * Keep those macros in sync with those in
83 * include/linux/usb/composite.h or else GCC will complain. If they
84 * are identical (the same names of arguments, white spaces in the
85 * same places) GCC will allow redefinition otherwise (even if some
86 * white space is removed or added) warning will be issued.
87 *
88 * Those macros are needed here because File Storage Gadget does not
89 * include the composite.h header. For composite gadgets those macros
90 * are redundant since composite.h is included any way.
91 *
92 * One could check whether those macros are already defined (which
93 * would indicate composite.h had been included) or not (which would
94 * indicate we were in FSG) but this is not done because a warning is
95 * desired if definitions here differ from the ones in composite.h.
96 *
97 * We want the definitions to match and be the same in File Storage
98 * Gadget as well as Mass Storage Function (and so composite gadgets
99 * using MSF). If someone changes them in composite.h it will produce
100 * a warning in this file when building MSF.
101 */
102#define DBG(d, fmt, args...) dev_dbg(&(d)->gadget->dev , fmt , ## args)
103#define VDBG(d, fmt, args...) dev_vdbg(&(d)->gadget->dev , fmt , ## args)
104#define ERROR(d, fmt, args...) dev_err(&(d)->gadget->dev , fmt , ## args)
105#define WARNING(d, fmt, args...) dev_warn(&(d)->gadget->dev , fmt , ## args)
106#define INFO(d, fmt, args...) dev_info(&(d)->gadget->dev , fmt , ## args)
107
108
109
110#ifdef DUMP_MSGS
111
112# define dump_msg(fsg, /* const char * */ label, \
113 /* const u8 * */ buf, /* unsigned */ length) do { \
114 if (length < 512) { \
115 DBG(fsg, "%s, length %u:\n", label, length); \
116 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
117 16, 1, buf, length, 0); \
118 } \
119} while (0)
120
121# define dump_cdb(fsg) do { } while (0)
122
123#else
124
125# define dump_msg(fsg, /* const char * */ label, \
126 /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
127
128# ifdef VERBOSE_DEBUG
129
130# define dump_cdb(fsg) \
131 print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
132 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
133
134# else
135
136# define dump_cdb(fsg) do { } while (0)
137
138# endif /* VERBOSE_DEBUG */
139
140#endif /* DUMP_MSGS */
141
142/*-------------------------------------------------------------------------*/
143
144/* CBI Interrupt data structure */
145struct interrupt_data {
146 u8 bType;
147 u8 bValue;
148};
149
150#define CBI_INTERRUPT_DATA_LEN 2
151
152/* CBI Accept Device-Specific Command request */
153#define USB_CBI_ADSC_REQUEST 0x00
154
155
156/* Length of a SCSI Command Data Block */
157#define MAX_COMMAND_SIZE 16
158
159/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
160#define SS_NO_SENSE 0
161#define SS_COMMUNICATION_FAILURE 0x040800
162#define SS_INVALID_COMMAND 0x052000
163#define SS_INVALID_FIELD_IN_CDB 0x052400
164#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
165#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
166#define SS_MEDIUM_NOT_PRESENT 0x023a00
167#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
168#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
169#define SS_RESET_OCCURRED 0x062900
170#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
171#define SS_UNRECOVERED_READ_ERROR 0x031100
172#define SS_WRITE_ERROR 0x030c02
173#define SS_WRITE_PROTECTED 0x072700
174
175#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
176#define ASC(x) ((u8) ((x) >> 8))
177#define ASCQ(x) ((u8) (x))
178
179
180/*-------------------------------------------------------------------------*/
181
182
183struct fsg_lun {
184 struct file *filp;
185 loff_t file_length;
186 loff_t num_sectors;
187
188 unsigned int initially_ro:1;
189 unsigned int ro:1;
190 unsigned int removable:1;
191 unsigned int cdrom:1;
192 unsigned int prevent_medium_removal:1;
193 unsigned int registered:1;
194 unsigned int info_valid:1;
195 unsigned int nofua:1;
196
197 u32 sense_data;
198 u32 sense_data_info;
199 u32 unit_attention_data;
200
201 unsigned int blkbits; /* Bits of logical block size of bound block device */
202 unsigned int blksize; /* logical block size of bound block device */
203 struct device dev;
204};
205
206#define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
207
208static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
209{
210 return container_of(dev, struct fsg_lun, dev);
211}
212
213
214/* Big enough to hold our biggest descriptor */
215#define EP0_BUFSIZE 256
216#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
217
218#ifdef CONFIG_USB_GADGET_DEBUG_FILES
219
220static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
221module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);
222MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers");
223
224#else
225
226/*
227 * Number of buffers we will use.
228 * 2 is usually enough for good buffering pipeline
229 */
230#define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
231
232#endif /* CONFIG_USB_DEBUG */
233
234/* check if fsg_num_buffers is within a valid range */
235static inline int fsg_num_buffers_validate(void)
236{
237 if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4)
238 return 0;
239 pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
240 fsg_num_buffers, 2 ,4);
241 return -EINVAL;
242}
243
244/* Default size of buffer length. */
245#define FSG_BUFLEN ((u32)16384)
246
247/* Maximal number of LUNs supported in mass storage function */
248#define FSG_MAX_LUNS 8
249
250enum fsg_buffer_state {
251 BUF_STATE_EMPTY = 0,
252 BUF_STATE_FULL,
253 BUF_STATE_BUSY
254};
255
256struct fsg_buffhd {
257 void *buf;
258 enum fsg_buffer_state state;
259 struct fsg_buffhd *next;
260
261 /*
262 * The NetChip 2280 is faster, and handles some protocol faults
263 * better, if we don't submit any short bulk-out read requests.
264 * So we will record the intended request length here.
265 */
266 unsigned int bulk_out_intended_length;
267
268 struct usb_request *inreq;
269 int inreq_busy;
270 struct usb_request *outreq;
271 int outreq_busy;
272};
273
274enum fsg_state {
275 /* This one isn't used anywhere */
276 FSG_STATE_COMMAND_PHASE = -10,
277 FSG_STATE_DATA_PHASE,
278 FSG_STATE_STATUS_PHASE,
279
280 FSG_STATE_IDLE = 0,
281 FSG_STATE_ABORT_BULK_OUT,
282 FSG_STATE_RESET,
283 FSG_STATE_INTERFACE_CHANGE,
284 FSG_STATE_CONFIG_CHANGE,
285 FSG_STATE_DISCONNECT,
286 FSG_STATE_EXIT,
287 FSG_STATE_TERMINATED
288};
289
290enum data_direction {
291 DATA_DIR_UNKNOWN = 0,
292 DATA_DIR_FROM_HOST,
293 DATA_DIR_TO_HOST,
294 DATA_DIR_NONE
295};
296
297
298/*-------------------------------------------------------------------------*/
299
300
301static inline u32 get_unaligned_be24(u8 *buf)
302{
303 return 0xffffff & (u32) get_unaligned_be32(buf - 1);
304}
305
306
307/*-------------------------------------------------------------------------*/
308
309
310enum {
311#ifndef FSG_NO_DEVICE_STRINGS
312 FSG_STRING_MANUFACTURER = 1,
313 FSG_STRING_PRODUCT,
314 FSG_STRING_SERIAL,
315 FSG_STRING_CONFIG,
316#endif
317 FSG_STRING_INTERFACE
318};
319
320
321#ifndef FSG_NO_OTG
322static struct usb_otg_descriptor
323fsg_otg_desc = {
324 .bLength = sizeof fsg_otg_desc,
325 .bDescriptorType = USB_DT_OTG,
326
327 .bmAttributes = USB_OTG_SRP,
328};
329#endif
330
331/* There is only one interface. */
332
333static struct usb_interface_descriptor
334fsg_intf_desc = {
335 .bLength = sizeof fsg_intf_desc,
336 .bDescriptorType = USB_DT_INTERFACE,
337
338 .bNumEndpoints = 2, /* Adjusted during fsg_bind() */
339 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
340 .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */
341 .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */
342 .iInterface = FSG_STRING_INTERFACE,
343};
344
345/*
346 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
347 * interrupt-in.
348 */
349
350static struct usb_endpoint_descriptor
351fsg_fs_bulk_in_desc = {
352 .bLength = USB_DT_ENDPOINT_SIZE,
353 .bDescriptorType = USB_DT_ENDPOINT,
354
355 .bEndpointAddress = USB_DIR_IN,
356 .bmAttributes = USB_ENDPOINT_XFER_BULK,
357 /* wMaxPacketSize set by autoconfiguration */
358};
359
360static struct usb_endpoint_descriptor
361fsg_fs_bulk_out_desc = {
362 .bLength = USB_DT_ENDPOINT_SIZE,
363 .bDescriptorType = USB_DT_ENDPOINT,
364
365 .bEndpointAddress = USB_DIR_OUT,
366 .bmAttributes = USB_ENDPOINT_XFER_BULK,
367 /* wMaxPacketSize set by autoconfiguration */
368};
369
370#ifndef FSG_NO_INTR_EP
371
372static struct usb_endpoint_descriptor
373fsg_fs_intr_in_desc = {
374 .bLength = USB_DT_ENDPOINT_SIZE,
375 .bDescriptorType = USB_DT_ENDPOINT,
376
377 .bEndpointAddress = USB_DIR_IN,
378 .bmAttributes = USB_ENDPOINT_XFER_INT,
379 .wMaxPacketSize = cpu_to_le16(2),
380 .bInterval = 32, /* frames -> 32 ms */
381};
382
383#ifndef FSG_NO_OTG
384# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
385#else
386# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
387#endif
388
389#endif
390
391static struct usb_descriptor_header *fsg_fs_function[] = {
392#ifndef FSG_NO_OTG
393 (struct usb_descriptor_header *) &fsg_otg_desc,
394#endif
395 (struct usb_descriptor_header *) &fsg_intf_desc,
396 (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc,
397 (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
398#ifndef FSG_NO_INTR_EP
399 (struct usb_descriptor_header *) &fsg_fs_intr_in_desc,
400#endif
401 NULL,
402};
403
404
405/*
406 * USB 2.0 devices need to expose both high speed and full speed
407 * descriptors, unless they only run at full speed.
408 *
409 * That means alternate endpoint descriptors (bigger packets)
410 * and a "device qualifier" ... plus more construction options
411 * for the configuration descriptor.
412 */
413static struct usb_endpoint_descriptor
414fsg_hs_bulk_in_desc = {
415 .bLength = USB_DT_ENDPOINT_SIZE,
416 .bDescriptorType = USB_DT_ENDPOINT,
417
418 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
419 .bmAttributes = USB_ENDPOINT_XFER_BULK,
420 .wMaxPacketSize = cpu_to_le16(512),
421};
422
423static struct usb_endpoint_descriptor
424fsg_hs_bulk_out_desc = {
425 .bLength = USB_DT_ENDPOINT_SIZE,
426 .bDescriptorType = USB_DT_ENDPOINT,
427
428 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
429 .bmAttributes = USB_ENDPOINT_XFER_BULK,
430 .wMaxPacketSize = cpu_to_le16(512),
431 .bInterval = 1, /* NAK every 1 uframe */
432};
433
434#ifndef FSG_NO_INTR_EP
435
436static struct usb_endpoint_descriptor
437fsg_hs_intr_in_desc = {
438 .bLength = USB_DT_ENDPOINT_SIZE,
439 .bDescriptorType = USB_DT_ENDPOINT,
440
441 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
442 .bmAttributes = USB_ENDPOINT_XFER_INT,
443 .wMaxPacketSize = cpu_to_le16(2),
444 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */
445};
446
447#ifndef FSG_NO_OTG
448# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
449#else
450# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
451#endif
452
453#endif
454
455static struct usb_descriptor_header *fsg_hs_function[] = {
456#ifndef FSG_NO_OTG
457 (struct usb_descriptor_header *) &fsg_otg_desc,
458#endif
459 (struct usb_descriptor_header *) &fsg_intf_desc,
460 (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc,
461 (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
462#ifndef FSG_NO_INTR_EP
463 (struct usb_descriptor_header *) &fsg_hs_intr_in_desc,
464#endif
465 NULL,
466};
467
468static struct usb_endpoint_descriptor
469fsg_ss_bulk_in_desc = {
470 .bLength = USB_DT_ENDPOINT_SIZE,
471 .bDescriptorType = USB_DT_ENDPOINT,
472
473 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
474 .bmAttributes = USB_ENDPOINT_XFER_BULK,
475 .wMaxPacketSize = cpu_to_le16(1024),
476};
477
478static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc = {
479 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
480 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
481
482 /*.bMaxBurst = DYNAMIC, */
483};
484
485static struct usb_endpoint_descriptor
486fsg_ss_bulk_out_desc = {
487 .bLength = USB_DT_ENDPOINT_SIZE,
488 .bDescriptorType = USB_DT_ENDPOINT,
489
490 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
491 .bmAttributes = USB_ENDPOINT_XFER_BULK,
492 .wMaxPacketSize = cpu_to_le16(1024),
493};
494
495static struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = {
496 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
497 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
498
499 /*.bMaxBurst = DYNAMIC, */
500};
501
502#ifndef FSG_NO_INTR_EP
503
504static struct usb_endpoint_descriptor
505fsg_ss_intr_in_desc = {
506 .bLength = USB_DT_ENDPOINT_SIZE,
507 .bDescriptorType = USB_DT_ENDPOINT,
508
509 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
510 .bmAttributes = USB_ENDPOINT_XFER_INT,
511 .wMaxPacketSize = cpu_to_le16(2),
512 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */
513};
514
515static struct usb_ss_ep_comp_descriptor fsg_ss_intr_in_comp_desc = {
516 .bLength = sizeof(fsg_ss_bulk_in_comp_desc),
517 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
518
519 .wBytesPerInterval = cpu_to_le16(2),
520};
521
522#ifndef FSG_NO_OTG
523# define FSG_SS_FUNCTION_PRE_EP_ENTRIES 2
524#else
525# define FSG_SS_FUNCTION_PRE_EP_ENTRIES 1
526#endif
527
528#endif
529
530static __maybe_unused struct usb_ext_cap_descriptor fsg_ext_cap_desc = {
531 .bLength = USB_DT_USB_EXT_CAP_SIZE,
532 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
533 .bDevCapabilityType = USB_CAP_TYPE_EXT,
534
535 .bmAttributes = cpu_to_le32(USB_LPM_SUPPORT),
536};
537
538static __maybe_unused struct usb_ss_cap_descriptor fsg_ss_cap_desc = {
539 .bLength = USB_DT_USB_SS_CAP_SIZE,
540 .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
541 .bDevCapabilityType = USB_SS_CAP_TYPE,
542
543 /* .bmAttributes = LTM is not supported yet */
544
545 .wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION
546 | USB_FULL_SPEED_OPERATION
547 | USB_HIGH_SPEED_OPERATION
548 | USB_5GBPS_OPERATION),
549 .bFunctionalitySupport = USB_LOW_SPEED_OPERATION,
550 .bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT,
551 .bU2DevExitLat = cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT),
552};
553
554static __maybe_unused struct usb_bos_descriptor fsg_bos_desc = {
555 .bLength = USB_DT_BOS_SIZE,
556 .bDescriptorType = USB_DT_BOS,
557
558 .wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE
559 + USB_DT_USB_EXT_CAP_SIZE
560 + USB_DT_USB_SS_CAP_SIZE),
561
562 .bNumDeviceCaps = 2,
563};
564
565static struct usb_descriptor_header *fsg_ss_function[] = {
566#ifndef FSG_NO_OTG
567 (struct usb_descriptor_header *) &fsg_otg_desc,
568#endif
569 (struct usb_descriptor_header *) &fsg_intf_desc,
570 (struct usb_descriptor_header *) &fsg_ss_bulk_in_desc,
571 (struct usb_descriptor_header *) &fsg_ss_bulk_in_comp_desc,
572 (struct usb_descriptor_header *) &fsg_ss_bulk_out_desc,
573 (struct usb_descriptor_header *) &fsg_ss_bulk_out_comp_desc,
574#ifndef FSG_NO_INTR_EP
575 (struct usb_descriptor_header *) &fsg_ss_intr_in_desc,
576 (struct usb_descriptor_header *) &fsg_ss_intr_in_comp_desc,
577#endif
578 NULL,
579};
580
581/* Maxpacket and other transfer characteristics vary by speed. */
582static __maybe_unused struct usb_endpoint_descriptor *
583fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
584 struct usb_endpoint_descriptor *hs,
585 struct usb_endpoint_descriptor *ss)
586{
587 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
588 return ss;
589 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
590 return hs;
591 return fs;
592}
593
594
595/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
596static struct usb_string fsg_strings[] = {
597#ifndef FSG_NO_DEVICE_STRINGS
598 {FSG_STRING_MANUFACTURER, fsg_string_manufacturer},
599 {FSG_STRING_PRODUCT, fsg_string_product},
600 {FSG_STRING_SERIAL, ""},
601 {FSG_STRING_CONFIG, fsg_string_config},
602#endif
603 {FSG_STRING_INTERFACE, fsg_string_interface},
604 {}
605};
606
607static struct usb_gadget_strings fsg_stringtab = {
608 .language = 0x0409, /* en-us */
609 .strings = fsg_strings,
610};
611
612
613 /*-------------------------------------------------------------------------*/
614
615/*
616 * If the next two routines are called while the gadget is registered,
617 * the caller must own fsg->filesem for writing.
618 */
619
620static void fsg_lun_close(struct fsg_lun *curlun)
621{
622 if (curlun->filp) {
623 LDBG(curlun, "close backing file\n");
624 fput(curlun->filp);
625 curlun->filp = NULL;
626 }
627}
628
629
630static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
631{
632 int ro;
633 struct file *filp = NULL;
634 int rc = -EINVAL;
635 struct inode *inode = NULL;
636 loff_t size;
637 loff_t num_sectors;
638 loff_t min_sectors;
639 unsigned int blkbits;
640 unsigned int blksize;
641
642 /* R/W if we can, R/O if we must */
643 ro = curlun->initially_ro;
644 if (!ro) {
645 filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
646 if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES)
647 ro = 1;
648 }
649 if (ro)
650 filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0);
651 if (IS_ERR(filp)) {
652 LINFO(curlun, "unable to open backing file: %s\n", filename);
653 return PTR_ERR(filp);
654 }
655
656 if (!(filp->f_mode & FMODE_WRITE))
657 ro = 1;
658
496ad9aa 659 inode = file_inode(filp);
e220ff75
SAS		 660 if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) {
661 LINFO(curlun, "invalid file type: %s\n", filename);
662 goto out;
663 }
664
665 /*
666 * If we can't read the file, it's no good.
667 * If we can't write the file, use it read-only.
668 */
669 if (!(filp->f_op->read || filp->f_op->aio_read)) {
670 LINFO(curlun, "file not readable: %s\n", filename);
671 goto out;
672 }
673 if (!(filp->f_op->write || filp->f_op->aio_write))
674 ro = 1;
675
676 size = i_size_read(inode->i_mapping->host);
677 if (size < 0) {
678 LINFO(curlun, "unable to find file size: %s\n", filename);
679 rc = (int) size;
680 goto out;
681 }
682
683 if (curlun->cdrom) {
684 blksize = 2048;
685 blkbits = 11;
686 } else if (inode->i_bdev) {
687 blksize = bdev_logical_block_size(inode->i_bdev);
688 blkbits = blksize_bits(blksize);
689 } else {
690 blksize = 512;
691 blkbits = 9;
692 }
693
694 num_sectors = size >> blkbits; /* File size in logic-block-size blocks */
695 min_sectors = 1;
696 if (curlun->cdrom) {
697 min_sectors = 300; /* Smallest track is 300 frames */
698 if (num_sectors >= 256*60*75) {
699 num_sectors = 256*60*75 - 1;
700 LINFO(curlun, "file too big: %s\n", filename);
701 LINFO(curlun, "using only first %d blocks\n",
702 (int) num_sectors);
703 }
704 }
705 if (num_sectors < min_sectors) {
706 LINFO(curlun, "file too small: %s\n", filename);
707 rc = -ETOOSMALL;
708 goto out;
709 }
710
711 if (fsg_lun_is_open(curlun))
712 fsg_lun_close(curlun);
713
714 curlun->blksize = blksize;
715 curlun->blkbits = blkbits;
716 curlun->ro = ro;
717 curlun->filp = filp;
718 curlun->file_length = size;
719 curlun->num_sectors = num_sectors;
720 LDBG(curlun, "open backing file: %s\n", filename);
721 return 0;
722
723out:
724 fput(filp);
725 return rc;
726}
727
728
729/*-------------------------------------------------------------------------*/
730
731/*
732 * Sync the file data, don't bother with the metadata.
733 * This code was copied from fs/buffer.c:sys_fdatasync().
734 */
735static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
736{
737 struct file *filp = curlun->filp;
738
739 if (curlun->ro || !filp)
740 return 0;
741 return vfs_fsync(filp, 1);
742}
743
744static void store_cdrom_address(u8 *dest, int msf, u32 addr)
745{
746 if (msf) {
747 /* Convert to Minutes-Seconds-Frames */
748 addr >>= 2; /* Convert to 2048-byte frames */
749 addr += 2*75; /* Lead-in occupies 2 seconds */
750 dest[3] = addr % 75; /* Frames */
751 addr /= 75;
752 dest[2] = addr % 60; /* Seconds */
753 addr /= 60;
754 dest[1] = addr; /* Minutes */
755 dest[0] = 0; /* Reserved */
756 } else {
757 /* Absolute sector */
758 put_unaligned_be32(addr, dest);
759 }
760}
761
762
763/*-------------------------------------------------------------------------*/
764
765
766static ssize_t fsg_show_ro(struct device *dev, struct device_attribute *attr,
767 char *buf)
768{
769 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
770
771 return sprintf(buf, "%d\n", fsg_lun_is_open(curlun)
772 ? curlun->ro
773 : curlun->initially_ro);
774}
775
776static ssize_t fsg_show_nofua(struct device *dev, struct device_attribute *attr,
777 char *buf)
778{
779 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
780
781 return sprintf(buf, "%u\n", curlun->nofua);
782}
783
784static ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
785 char *buf)
786{
787 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
788 struct rw_semaphore *filesem = dev_get_drvdata(dev);
789 char *p;
790 ssize_t rc;
791
792 down_read(filesem);
793 if (fsg_lun_is_open(curlun)) { /* Get the complete pathname */
794 p = d_path(&curlun->filp->f_path, buf, PAGE_SIZE - 1);
795 if (IS_ERR(p))
796 rc = PTR_ERR(p);
797 else {
798 rc = strlen(p);
799 memmove(buf, p, rc);
800 buf[rc] = '\n'; /* Add a newline */
801 buf[++rc] = 0;
802 }
803 } else { /* No file, return 0 bytes */
804 *buf = 0;
805 rc = 0;
806 }
807 up_read(filesem);
808 return rc;
809}
810
811
812static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
813 const char *buf, size_t count)
814{
815 ssize_t rc;
816 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
817 struct rw_semaphore *filesem = dev_get_drvdata(dev);
818 unsigned ro;
819
820 rc = kstrtouint(buf, 2, &ro);
821 if (rc)
822 return rc;
823
824 /*
825 * Allow the write-enable status to change only while the
826 * backing file is closed.
827 */
828 down_read(filesem);
829 if (fsg_lun_is_open(curlun)) {
830 LDBG(curlun, "read-only status change prevented\n");
831 rc = -EBUSY;
832 } else {
833 curlun->ro = ro;
834 curlun->initially_ro = ro;
835 LDBG(curlun, "read-only status set to %d\n", curlun->ro);
836 rc = count;
837 }
838 up_read(filesem);
839 return rc;
840}
841
842static ssize_t fsg_store_nofua(struct device *dev,
843 struct device_attribute *attr,
844 const char *buf, size_t count)
845{
846 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
847 unsigned nofua;
848 int ret;
849
850 ret = kstrtouint(buf, 2, &nofua);
851 if (ret)
852 return ret;
853
854 /* Sync data when switching from async mode to sync */
855 if (!nofua && curlun->nofua)
856 fsg_lun_fsync_sub(curlun);
857
858 curlun->nofua = nofua;
859
860 return count;
861}
862
863static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
864 const char *buf, size_t count)
865{
866 struct fsg_lun *curlun = fsg_lun_from_dev(dev);
867 struct rw_semaphore *filesem = dev_get_drvdata(dev);
868 int rc = 0;
869
870 if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) {
871 LDBG(curlun, "eject attempt prevented\n");
872 return -EBUSY; /* "Door is locked" */
873 }
874
875 /* Remove a trailing newline */
876 if (count > 0 && buf[count-1] == '\n')
877 ((char *) buf)[count-1] = 0; /* Ugh! */
878
879 /* Load new medium */
880 down_write(filesem);
881 if (count > 0 && buf[0]) {
882 /* fsg_lun_open() will close existing file if any. */
883 rc = fsg_lun_open(curlun, buf);
884 if (rc == 0)
885 curlun->unit_attention_data =
886 SS_NOT_READY_TO_READY_TRANSITION;
887 } else if (fsg_lun_is_open(curlun)) {
888 fsg_lun_close(curlun);
889 curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT;
890 }
891 up_write(filesem);
892 return (rc < 0 ? rc : count);
893}
kernel source for telekom puls (alcatel/mediatek)