2005-04-17 06:20:36 +08:00
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/*
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pg.c (c) 1998 Grant R. Guenther <grant@torque.net>
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Under the terms of the GNU General Public License.
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The pg driver provides a simple character device interface for
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sending ATAPI commands to a device. With the exception of the
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ATAPI reset operation, all operations are performed by a pair
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of read and write operations to the appropriate /dev/pgN device.
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A write operation delivers a command and any outbound data in
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a single buffer. Normally, the write will succeed unless the
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device is offline or malfunctioning, or there is already another
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command pending. If the write succeeds, it should be followed
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immediately by a read operation, to obtain any returned data and
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status information. A read will fail if there is no operation
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in progress.
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As a special case, the device can be reset with a write operation,
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and in this case, no following read is expected, or permitted.
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There are no ioctl() operations. Any single operation
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may transfer at most PG_MAX_DATA bytes. Note that the driver must
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copy the data through an internal buffer. In keeping with all
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current ATAPI devices, command packets are assumed to be exactly
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12 bytes in length.
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To permit future changes to this interface, the headers in the
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read and write buffers contain a single character "magic" flag.
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Currently this flag must be the character "P".
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By default, the driver will autoprobe for a single parallel
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port ATAPI device, but if their individual parameters are
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specified, the driver can handle up to 4 devices.
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To use this device, you must have the following device
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special files defined:
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/dev/pg0 c 97 0
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/dev/pg1 c 97 1
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/dev/pg2 c 97 2
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/dev/pg3 c 97 3
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(You'll need to change the 97 to something else if you use
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the 'major' parameter to install the driver on a different
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major number.)
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The behaviour of the pg driver can be altered by setting
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some parameters from the insmod command line. The following
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parameters are adjustable:
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drive0 These four arguments can be arrays of
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drive1 1-6 integers as follows:
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drive2
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drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
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Where,
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<prt> is the base of the parallel port address for
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the corresponding drive. (required)
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<pro> is the protocol number for the adapter that
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supports this drive. These numbers are
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logged by 'paride' when the protocol modules
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are initialised. (0 if not given)
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<uni> for those adapters that support chained
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devices, this is the unit selector for the
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chain of devices on the given port. It should
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be zero for devices that don't support chaining.
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(0 if not given)
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<mod> this can be -1 to choose the best mode, or one
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of the mode numbers supported by the adapter.
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(-1 if not given)
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<slv> ATAPI devices can be jumpered to master or slave.
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Set this to 0 to choose the master drive, 1 to
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choose the slave, -1 (the default) to choose the
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first drive found.
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<dly> some parallel ports require the driver to
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go more slowly. -1 sets a default value that
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should work with the chosen protocol. Otherwise,
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set this to a small integer, the larger it is
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the slower the port i/o. In some cases, setting
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this to zero will speed up the device. (default -1)
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major You may use this parameter to overide the
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default major number (97) that this driver
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will use. Be sure to change the device
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name as well.
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name This parameter is a character string that
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contains the name the kernel will use for this
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device (in /proc output, for instance).
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(default "pg").
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verbose This parameter controls the amount of logging
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that is done by the driver. Set it to 0 for
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quiet operation, to 1 to enable progress
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messages while the driver probes for devices,
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or to 2 for full debug logging. (default 0)
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If this driver is built into the kernel, you can use
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the following command line parameters, with the same values
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as the corresponding module parameters listed above:
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pg.drive0
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pg.drive1
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pg.drive2
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pg.drive3
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In addition, you can use the parameter pg.disable to disable
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the driver entirely.
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*/
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/* Changes:
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1.01 GRG 1998.06.16 Bug fixes
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1.02 GRG 1998.09.24 Added jumbo support
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*/
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#define PG_VERSION "1.02"
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#define PG_MAJOR 97
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#define PG_NAME "pg"
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#define PG_UNITS 4
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#ifndef PI_PG
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#define PI_PG 4
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#endif
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/* Here are things one can override from the insmod command.
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Most are autoprobed by paride unless set here. Verbose is 0
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by default.
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*/
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static int verbose = 0;
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static int major = PG_MAJOR;
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static char *name = PG_NAME;
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static int disable = 0;
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static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
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static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
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static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
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static int pg_drive_count;
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enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
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/* end of parameters */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/mtio.h>
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#include <linux/pg.h>
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#include <linux/device.h>
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2005-10-31 07:03:48 +08:00
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#include <linux/sched.h> /* current, TASK_* */
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2010-06-02 20:28:52 +08:00
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#include <linux/mutex.h>
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2005-10-31 07:03:48 +08:00
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#include <linux/jiffies.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/uaccess.h>
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module_param(verbose, bool, 0644);
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module_param(major, int, 0);
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module_param(name, charp, 0);
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module_param_array(drive0, int, NULL, 0);
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module_param_array(drive1, int, NULL, 0);
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module_param_array(drive2, int, NULL, 0);
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module_param_array(drive3, int, NULL, 0);
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#include "paride.h"
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#define PG_SPIN_DEL 50 /* spin delay in micro-seconds */
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#define PG_SPIN 200
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#define PG_TMO HZ
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#define PG_RESET_TMO 10*HZ
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#define STAT_ERR 0x01
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#define STAT_INDEX 0x02
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#define STAT_ECC 0x04
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#define STAT_DRQ 0x08
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#define STAT_SEEK 0x10
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#define STAT_WRERR 0x20
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#define STAT_READY 0x40
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#define STAT_BUSY 0x80
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#define ATAPI_IDENTIFY 0x12
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2010-06-02 20:28:52 +08:00
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static DEFINE_MUTEX(pg_mutex);
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2005-04-17 06:20:36 +08:00
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static int pg_open(struct inode *inode, struct file *file);
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static int pg_release(struct inode *inode, struct file *file);
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static ssize_t pg_read(struct file *filp, char __user *buf,
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size_t count, loff_t * ppos);
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static ssize_t pg_write(struct file *filp, const char __user *buf,
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size_t count, loff_t * ppos);
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static int pg_detect(void);
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#define PG_NAMELEN 8
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struct pg {
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struct pi_adapter pia; /* interface to paride layer */
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struct pi_adapter *pi;
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int busy; /* write done, read expected */
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int start; /* jiffies at command start */
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int dlen; /* transfer size requested */
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unsigned long timeout; /* timeout requested */
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int status; /* last sense key */
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int drive; /* drive */
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unsigned long access; /* count of active opens ... */
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int present; /* device present ? */
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char *bufptr;
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char name[PG_NAMELEN]; /* pg0, pg1, ... */
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};
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static struct pg devices[PG_UNITS];
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static int pg_identify(struct pg *dev, int log);
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static char pg_scratch[512]; /* scratch block buffer */
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2005-03-24 01:52:10 +08:00
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static struct class *pg_class;
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2005-04-17 06:20:36 +08:00
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/* kernel glue structures */
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2007-02-12 16:55:32 +08:00
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static const struct file_operations pg_fops = {
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2005-04-17 06:20:36 +08:00
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.owner = THIS_MODULE,
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.read = pg_read,
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.write = pg_write,
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.open = pg_open,
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.release = pg_release,
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llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
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nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
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*off += E
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func(..., off, ...)
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E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
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*off += E
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func(..., off, ...)
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E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-16 00:52:59 +08:00
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.llseek = noop_llseek,
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2005-04-17 06:20:36 +08:00
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};
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static void pg_init_units(void)
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{
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int unit;
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pg_drive_count = 0;
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for (unit = 0; unit < PG_UNITS; unit++) {
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int *parm = *drives[unit];
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struct pg *dev = &devices[unit];
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dev->pi = &dev->pia;
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clear_bit(0, &dev->access);
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dev->busy = 0;
|
|
|
|
dev->present = 0;
|
|
|
|
dev->bufptr = NULL;
|
|
|
|
dev->drive = parm[D_SLV];
|
|
|
|
snprintf(dev->name, PG_NAMELEN, "%s%c", name, 'a'+unit);
|
|
|
|
if (parm[D_PRT])
|
|
|
|
pg_drive_count++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int status_reg(struct pg *dev)
|
|
|
|
{
|
|
|
|
return pi_read_regr(dev->pi, 1, 6);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int read_reg(struct pg *dev, int reg)
|
|
|
|
{
|
|
|
|
return pi_read_regr(dev->pi, 0, reg);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void write_reg(struct pg *dev, int reg, int val)
|
|
|
|
{
|
|
|
|
pi_write_regr(dev->pi, 0, reg, val);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u8 DRIVE(struct pg *dev)
|
|
|
|
{
|
|
|
|
return 0xa0+0x10*dev->drive;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void pg_sleep(int cs)
|
|
|
|
{
|
2005-09-10 15:27:28 +08:00
|
|
|
schedule_timeout_interruptible(cs);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_wait(struct pg *dev, int go, int stop, unsigned long tmo, char *msg)
|
|
|
|
{
|
|
|
|
int j, r, e, s, p, to;
|
|
|
|
|
|
|
|
dev->status = 0;
|
|
|
|
|
|
|
|
j = 0;
|
|
|
|
while ((((r = status_reg(dev)) & go) || (stop && (!(r & stop))))
|
|
|
|
&& time_before(jiffies, tmo)) {
|
|
|
|
if (j++ < PG_SPIN)
|
|
|
|
udelay(PG_SPIN_DEL);
|
|
|
|
else
|
|
|
|
pg_sleep(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
to = time_after_eq(jiffies, tmo);
|
|
|
|
|
|
|
|
if ((r & (STAT_ERR & stop)) || to) {
|
|
|
|
s = read_reg(dev, 7);
|
|
|
|
e = read_reg(dev, 1);
|
|
|
|
p = read_reg(dev, 2);
|
|
|
|
if (verbose > 1)
|
|
|
|
printk("%s: %s: stat=0x%x err=0x%x phase=%d%s\n",
|
|
|
|
dev->name, msg, s, e, p, to ? " timeout" : "");
|
|
|
|
if (to)
|
|
|
|
e |= 0x100;
|
|
|
|
dev->status = (e >> 4) & 0xff;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_command(struct pg *dev, char *cmd, int dlen, unsigned long tmo)
|
|
|
|
{
|
|
|
|
int k;
|
|
|
|
|
|
|
|
pi_connect(dev->pi);
|
|
|
|
|
|
|
|
write_reg(dev, 6, DRIVE(dev));
|
|
|
|
|
|
|
|
if (pg_wait(dev, STAT_BUSY | STAT_DRQ, 0, tmo, "before command"))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
write_reg(dev, 4, dlen % 256);
|
|
|
|
write_reg(dev, 5, dlen / 256);
|
|
|
|
write_reg(dev, 7, 0xa0); /* ATAPI packet command */
|
|
|
|
|
|
|
|
if (pg_wait(dev, STAT_BUSY, STAT_DRQ, tmo, "command DRQ"))
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
if (read_reg(dev, 2) != 1) {
|
|
|
|
printk("%s: command phase error\n", dev->name);
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
pi_write_block(dev->pi, cmd, 12);
|
|
|
|
|
|
|
|
if (verbose > 1) {
|
|
|
|
printk("%s: Command sent, dlen=%d packet= ", dev->name, dlen);
|
|
|
|
for (k = 0; k < 12; k++)
|
|
|
|
printk("%02x ", cmd[k] & 0xff);
|
|
|
|
printk("\n");
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
|
|
pi_disconnect(dev->pi);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_completion(struct pg *dev, char *buf, unsigned long tmo)
|
|
|
|
{
|
|
|
|
int r, d, n, p;
|
|
|
|
|
|
|
|
r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
|
|
|
|
tmo, "completion");
|
|
|
|
|
|
|
|
dev->dlen = 0;
|
|
|
|
|
|
|
|
while (read_reg(dev, 7) & STAT_DRQ) {
|
|
|
|
d = (read_reg(dev, 4) + 256 * read_reg(dev, 5));
|
|
|
|
n = ((d + 3) & 0xfffc);
|
|
|
|
p = read_reg(dev, 2) & 3;
|
|
|
|
if (p == 0)
|
|
|
|
pi_write_block(dev->pi, buf, n);
|
|
|
|
if (p == 2)
|
|
|
|
pi_read_block(dev->pi, buf, n);
|
|
|
|
if (verbose > 1)
|
|
|
|
printk("%s: %s %d bytes\n", dev->name,
|
|
|
|
p ? "Read" : "Write", n);
|
|
|
|
dev->dlen += (1 - p) * d;
|
|
|
|
buf += d;
|
|
|
|
r = pg_wait(dev, STAT_BUSY, STAT_DRQ | STAT_READY | STAT_ERR,
|
|
|
|
tmo, "completion");
|
|
|
|
}
|
|
|
|
|
|
|
|
pi_disconnect(dev->pi);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_reset(struct pg *dev)
|
|
|
|
{
|
|
|
|
int i, k, err;
|
|
|
|
int expect[5] = { 1, 1, 1, 0x14, 0xeb };
|
|
|
|
int got[5];
|
|
|
|
|
|
|
|
pi_connect(dev->pi);
|
|
|
|
write_reg(dev, 6, DRIVE(dev));
|
|
|
|
write_reg(dev, 7, 8);
|
|
|
|
|
|
|
|
pg_sleep(20 * HZ / 1000);
|
|
|
|
|
|
|
|
k = 0;
|
|
|
|
while ((k++ < PG_RESET_TMO) && (status_reg(dev) & STAT_BUSY))
|
|
|
|
pg_sleep(1);
|
|
|
|
|
|
|
|
for (i = 0; i < 5; i++)
|
|
|
|
got[i] = read_reg(dev, i + 1);
|
|
|
|
|
|
|
|
err = memcmp(expect, got, sizeof(got)) ? -1 : 0;
|
|
|
|
|
|
|
|
if (verbose) {
|
|
|
|
printk("%s: Reset (%d) signature = ", dev->name, k);
|
|
|
|
for (i = 0; i < 5; i++)
|
|
|
|
printk("%3x", got[i]);
|
|
|
|
if (err)
|
|
|
|
printk(" (incorrect)");
|
|
|
|
printk("\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
pi_disconnect(dev->pi);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xs(char *buf, char *targ, int len)
|
|
|
|
{
|
|
|
|
char l = '\0';
|
|
|
|
int k;
|
|
|
|
|
|
|
|
for (k = 0; k < len; k++) {
|
|
|
|
char c = *buf++;
|
2009-02-16 20:11:55 +08:00
|
|
|
if (c != ' ' && c != l)
|
2005-04-17 06:20:36 +08:00
|
|
|
l = *targ++ = c;
|
|
|
|
}
|
|
|
|
if (l == ' ')
|
|
|
|
targ--;
|
|
|
|
*targ = '\0';
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_identify(struct pg *dev, int log)
|
|
|
|
{
|
|
|
|
int s;
|
|
|
|
char *ms[2] = { "master", "slave" };
|
|
|
|
char mf[10], id[18];
|
|
|
|
char id_cmd[12] = { ATAPI_IDENTIFY, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
|
|
|
|
char buf[36];
|
|
|
|
|
|
|
|
s = pg_command(dev, id_cmd, 36, jiffies + PG_TMO);
|
|
|
|
if (s)
|
|
|
|
return -1;
|
|
|
|
s = pg_completion(dev, buf, jiffies + PG_TMO);
|
|
|
|
if (s)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
if (log) {
|
|
|
|
xs(buf + 8, mf, 8);
|
|
|
|
xs(buf + 16, id, 16);
|
|
|
|
printk("%s: %s %s, %s\n", dev->name, mf, id, ms[dev->drive]);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* returns 0, with id set if drive is detected
|
|
|
|
* -1, if drive detection failed
|
|
|
|
*/
|
|
|
|
static int pg_probe(struct pg *dev)
|
|
|
|
{
|
|
|
|
if (dev->drive == -1) {
|
|
|
|
for (dev->drive = 0; dev->drive <= 1; dev->drive++)
|
|
|
|
if (!pg_reset(dev))
|
|
|
|
return pg_identify(dev, 1);
|
|
|
|
} else {
|
|
|
|
if (!pg_reset(dev))
|
|
|
|
return pg_identify(dev, 1);
|
|
|
|
}
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_detect(void)
|
|
|
|
{
|
|
|
|
struct pg *dev = &devices[0];
|
|
|
|
int k, unit;
|
|
|
|
|
|
|
|
printk("%s: %s version %s, major %d\n", name, name, PG_VERSION, major);
|
|
|
|
|
|
|
|
k = 0;
|
|
|
|
if (pg_drive_count == 0) {
|
|
|
|
if (pi_init(dev->pi, 1, -1, -1, -1, -1, -1, pg_scratch,
|
|
|
|
PI_PG, verbose, dev->name)) {
|
|
|
|
if (!pg_probe(dev)) {
|
|
|
|
dev->present = 1;
|
|
|
|
k++;
|
|
|
|
} else
|
|
|
|
pi_release(dev->pi);
|
|
|
|
}
|
|
|
|
|
|
|
|
} else
|
|
|
|
for (unit = 0; unit < PG_UNITS; unit++, dev++) {
|
|
|
|
int *parm = *drives[unit];
|
|
|
|
if (!parm[D_PRT])
|
|
|
|
continue;
|
|
|
|
if (pi_init(dev->pi, 0, parm[D_PRT], parm[D_MOD],
|
|
|
|
parm[D_UNI], parm[D_PRO], parm[D_DLY],
|
|
|
|
pg_scratch, PI_PG, verbose, dev->name)) {
|
|
|
|
if (!pg_probe(dev)) {
|
|
|
|
dev->present = 1;
|
|
|
|
k++;
|
|
|
|
} else
|
|
|
|
pi_release(dev->pi);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (k)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
printk("%s: No ATAPI device detected\n", name);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
int unit = iminor(inode) & 0x7f;
|
|
|
|
struct pg *dev = &devices[unit];
|
2008-05-16 00:07:56 +08:00
|
|
|
int ret = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_lock(&pg_mutex);
|
2008-05-16 00:07:56 +08:00
|
|
|
if ((unit >= PG_UNITS) || (!dev->present)) {
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto out;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-05-16 00:07:56 +08:00
|
|
|
if (test_and_set_bit(0, &dev->access)) {
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto out;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (dev->busy) {
|
|
|
|
pg_reset(dev);
|
|
|
|
dev->busy = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
pg_identify(dev, (verbose > 1));
|
|
|
|
|
|
|
|
dev->bufptr = kmalloc(PG_MAX_DATA, GFP_KERNEL);
|
|
|
|
if (dev->bufptr == NULL) {
|
|
|
|
clear_bit(0, &dev->access);
|
|
|
|
printk("%s: buffer allocation failed\n", dev->name);
|
2008-05-16 00:07:56 +08:00
|
|
|
ret = -ENOMEM;
|
|
|
|
goto out;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
file->private_data = dev;
|
|
|
|
|
2008-05-16 00:07:56 +08:00
|
|
|
out:
|
2010-06-02 20:28:52 +08:00
|
|
|
mutex_unlock(&pg_mutex);
|
2008-05-16 00:07:56 +08:00
|
|
|
return ret;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static int pg_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct pg *dev = file->private_data;
|
|
|
|
|
|
|
|
kfree(dev->bufptr);
|
|
|
|
dev->bufptr = NULL;
|
|
|
|
clear_bit(0, &dev->access);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t pg_write(struct file *filp, const char __user *buf, size_t count, loff_t *ppos)
|
|
|
|
{
|
|
|
|
struct pg *dev = filp->private_data;
|
|
|
|
struct pg_write_hdr hdr;
|
|
|
|
int hs = sizeof (hdr);
|
|
|
|
|
|
|
|
if (dev->busy)
|
|
|
|
return -EBUSY;
|
|
|
|
if (count < hs)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (copy_from_user(&hdr, buf, hs))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (hdr.magic != PG_MAGIC)
|
|
|
|
return -EINVAL;
|
|
|
|
if (hdr.dlen > PG_MAX_DATA)
|
|
|
|
return -EINVAL;
|
|
|
|
if ((count - hs) > PG_MAX_DATA)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (hdr.func == PG_RESET) {
|
|
|
|
if (count != hs)
|
|
|
|
return -EINVAL;
|
|
|
|
if (pg_reset(dev))
|
|
|
|
return -EIO;
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hdr.func != PG_COMMAND)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
dev->start = jiffies;
|
|
|
|
dev->timeout = hdr.timeout * HZ + HZ / 2 + jiffies;
|
|
|
|
|
|
|
|
if (pg_command(dev, hdr.packet, hdr.dlen, jiffies + PG_TMO)) {
|
|
|
|
if (dev->status & 0x10)
|
|
|
|
return -ETIME;
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev->busy = 1;
|
|
|
|
|
|
|
|
if (copy_from_user(dev->bufptr, buf + hs, count - hs))
|
|
|
|
return -EFAULT;
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t pg_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
|
|
|
|
{
|
|
|
|
struct pg *dev = filp->private_data;
|
|
|
|
struct pg_read_hdr hdr;
|
|
|
|
int hs = sizeof (hdr);
|
|
|
|
int copy;
|
|
|
|
|
|
|
|
if (!dev->busy)
|
|
|
|
return -EINVAL;
|
|
|
|
if (count < hs)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
dev->busy = 0;
|
|
|
|
|
|
|
|
if (pg_completion(dev, dev->bufptr, dev->timeout))
|
|
|
|
if (dev->status & 0x10)
|
|
|
|
return -ETIME;
|
|
|
|
|
|
|
|
hdr.magic = PG_MAGIC;
|
|
|
|
hdr.dlen = dev->dlen;
|
|
|
|
copy = 0;
|
|
|
|
|
|
|
|
if (hdr.dlen < 0) {
|
|
|
|
hdr.dlen = -1 * hdr.dlen;
|
|
|
|
copy = hdr.dlen;
|
|
|
|
if (copy > (count - hs))
|
|
|
|
copy = count - hs;
|
|
|
|
}
|
|
|
|
|
|
|
|
hdr.duration = (jiffies - dev->start + HZ / 2) / HZ;
|
|
|
|
hdr.scsi = dev->status & 0x0f;
|
|
|
|
|
|
|
|
if (copy_to_user(buf, &hdr, hs))
|
|
|
|
return -EFAULT;
|
|
|
|
if (copy > 0)
|
|
|
|
if (copy_to_user(buf + hs, dev->bufptr, copy))
|
|
|
|
return -EFAULT;
|
|
|
|
return copy + hs;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init pg_init(void)
|
|
|
|
{
|
2006-03-28 17:56:18 +08:00
|
|
|
int unit;
|
|
|
|
int err;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (disable){
|
2006-12-07 12:36:43 +08:00
|
|
|
err = -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
pg_init_units();
|
|
|
|
|
|
|
|
if (pg_detect()) {
|
2006-12-07 12:36:43 +08:00
|
|
|
err = -ENODEV;
|
2005-04-17 06:20:36 +08:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2006-03-28 17:56:18 +08:00
|
|
|
err = register_chrdev(major, name, &pg_fops);
|
|
|
|
if (err < 0) {
|
2005-04-17 06:20:36 +08:00
|
|
|
printk("pg_init: unable to get major number %d\n", major);
|
|
|
|
for (unit = 0; unit < PG_UNITS; unit++) {
|
|
|
|
struct pg *dev = &devices[unit];
|
|
|
|
if (dev->present)
|
|
|
|
pi_release(dev->pi);
|
|
|
|
}
|
|
|
|
goto out;
|
|
|
|
}
|
2006-03-28 17:56:18 +08:00
|
|
|
major = err; /* In case the user specified `major=0' (dynamic) */
|
2005-03-24 01:52:10 +08:00
|
|
|
pg_class = class_create(THIS_MODULE, "pg");
|
2005-04-17 06:20:36 +08:00
|
|
|
if (IS_ERR(pg_class)) {
|
|
|
|
err = PTR_ERR(pg_class);
|
|
|
|
goto out_chrdev;
|
|
|
|
}
|
|
|
|
for (unit = 0; unit < PG_UNITS; unit++) {
|
|
|
|
struct pg *dev = &devices[unit];
|
2005-06-21 12:15:16 +08:00
|
|
|
if (dev->present)
|
2008-07-22 11:03:34 +08:00
|
|
|
device_create(pg_class, NULL, MKDEV(major, unit), NULL,
|
|
|
|
"pg%u", unit);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
err = 0;
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
out_chrdev:
|
|
|
|
unregister_chrdev(major, "pg");
|
|
|
|
out:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit pg_exit(void)
|
|
|
|
{
|
|
|
|
int unit;
|
|
|
|
|
|
|
|
for (unit = 0; unit < PG_UNITS; unit++) {
|
|
|
|
struct pg *dev = &devices[unit];
|
2005-06-21 12:15:16 +08:00
|
|
|
if (dev->present)
|
2007-09-25 08:03:03 +08:00
|
|
|
device_destroy(pg_class, MKDEV(major, unit));
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2005-03-24 01:52:10 +08:00
|
|
|
class_destroy(pg_class);
|
2005-04-17 06:20:36 +08:00
|
|
|
unregister_chrdev(major, name);
|
|
|
|
|
|
|
|
for (unit = 0; unit < PG_UNITS; unit++) {
|
|
|
|
struct pg *dev = &devices[unit];
|
|
|
|
if (dev->present)
|
|
|
|
pi_release(dev->pi);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(pg_init)
|
|
|
|
module_exit(pg_exit)
|