On 2/2/22 23:13, Christoph Hellwig wrote:
> On Sun, Jan 30, 2022 at 09:14:43PM +0100, Ondrej Zary wrote:
>> Here's the first version that works somehow. Detected LS-120 drive (epat) and
>> even mounted the filesystem and copied files! The code is crap (missing error
>> handling, unclaim/dicconnect, unregister, oopses on reboot, etc.).
>>
>> The pata_parport_* functions are copied from libata-sff.c and modified not to
>> use ioread/iowrite. The pi_* functions are copied from paride.c and slightly
>> modified. The original paride protocol modules can register without any
>> changes.
>
> Nice!
>
>> I'm not sure about the device model integration (required by libata?).
>> It currently registers "pata_parport" bus with a "new_device" sysfs file
>> which is used to create new devices. I wonder if it's the correct way - it's
>> not possible to simply modprobe something with parameters to get a working
>> drive.
>
> Not sure. Maybe Damien as the new libata maintainer has any idea what
> to best do about that.
Well, that is a first, no other driver define their own bus :)
Given that new_device_store() gets the port, protocol, delay etc from
the user, I guess that there is no way to automatically probe the
parallel port adapter to find out what devices are on it ?
If yes, then I think this is fine. I cannot think of any other method to
do it, unless your platform uses a device tree file, in which case the
setup should be passed using that file (like so many other platform
ata/pata drivers do).
>
>>
>> [ 130.605256] paride: epat registered as protocol 0
>> [ 132.363939] xxx: 0x378 is parport0
>> [ 132.374746] xxx: epat: port 0x378, mode 0, ccr 0, test=(0,256,0)
>> [ 132.374777] xxx: Sharing parport0 at 0x378
>> [ 132.374918] xxx: epat 1.02, Shuttle EPAT chip c6 at 0x378,
>> [ 132.374922] mode 0 (4-bit), delay 0
>> [ 132.374950] pi_init ok!
>> [ 132.377377] alloc_ok!
>> [ 132.394447] scsi host4: pata_parport
>> [ 132.394623] ata5: PATA max PIO0
>> [ 132.613339] ata5.00: ATAPI: LS-120 COSM 04 UHD Floppy, 0270M09T, max PIO2
>> [ 132.694550] scsi 4:0:0:0: Direct-Access MATSHITA LS-120 COSM 04 0270 PQ: 0 ANSI: 5
>> [ 132.729748] sd 4:0:0:0: Attached scsi generic sg1 type 0
>> [ 132.760779] sd 4:0:0:0: [sdb] Media removed, stopped polling
>> [ 132.792602] sd 4:0:0:0: [sdb] Attached SCSI removable disk
>> [ 151.142037] sd 4:0:0:0: [sdb] Read Capacity(16) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
>> [ 151.142090] sd 4:0:0:0: [sdb] Sense not available.
>> [ 151.204874] sd 4:0:0:0: [sdb] 246528 512-byte logical blocks: (126 MB/120 MiB)
>> [ 151.226471] sd 4:0:0:0: [sdb] Write Protect is on
>> [ 151.226514] sd 4:0:0:0: [sdb] Mode Sense: 00 66 31 80
>> [ 151.320880] sdb: detected capacity change from 0 to 246528
>> [ 152.090211] sdb:
>>
>> From ddfc09664e5800c57cda4908ccf1ba4db92e94c4 Mon Sep 17 00:00:00 2001
>> From: Ondrej Zary <linux@xxxxxxx>
>> Date: Sun, 30 Jan 2022 21:09:39 +0100
>> Subject: [PATCH] pata_parport: first preview
>>
>> ---
>> drivers/ata/Kconfig | 6 +
>> drivers/ata/Makefile | 2 +
>> drivers/ata/pata_parport.c | 688 +++++++++++++++++++++++++++++++++++++
>> 3 files changed, 696 insertions(+)
>> create mode 100644 drivers/ata/pata_parport.c
>>
>> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
>> index cb54631fd950..f2e130ff67d9 100644
>> --- a/drivers/ata/Kconfig
>> +++ b/drivers/ata/Kconfig
>> @@ -1161,6 +1161,12 @@ config PATA_WINBOND_VLB
>> Support for the Winbond W83759A controller on Vesa Local Bus
>> systems.
>>
>> +config PATA_PARPORT
>> + tristate "Parallel port IDE device support"
>> + depends on PARPORT_PC
>> + help
>> + Support for Parallel port IDE devices.
>> +
>> comment "Generic fallback / legacy drivers"
>>
>> config PATA_ACPI
>> diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
>> index b8aebfb14e82..77145834a585 100644
>> --- a/drivers/ata/Makefile
>> +++ b/drivers/ata/Makefile
>> @@ -114,6 +114,8 @@ obj-$(CONFIG_PATA_SAMSUNG_CF) += pata_samsung_cf.o
>>
>> obj-$(CONFIG_PATA_PXA) += pata_pxa.o
>>
>> +obj-$(CONFIG_PATA_PARPORT) += pata_parport.o
>> +
>> # Should be last but two libata driver
>> obj-$(CONFIG_PATA_ACPI) += pata_acpi.o
>> # Should be last but one libata driver
>> diff --git a/drivers/ata/pata_parport.c b/drivers/ata/pata_parport.c
>> new file mode 100644
>> index 000000000000..1edbbe9d9687
>> --- /dev/null
>> +++ b/drivers/ata/pata_parport.c
>> @@ -0,0 +1,688 @@
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/libata.h>
>> +#include <linux/parport.h>
>> +#include "paride.h"
>> +
>> +#define DRV_NAME "pata_parport"
>> +
>> +#define MAX_PROTOS 32
>> +static struct pi_protocol *protocols[MAX_PROTOS];
>> +
>> +static unsigned int pata_parport_devchk(struct ata_port *ap, unsigned int device)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> + u8 nsect, lbal;
>> +
>> + ap->ops->sff_dev_select(ap, device);
>> +
>> + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0x55);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa);
>> +
>> + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0xaa);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0x55);
>> +
>> + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 055);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa);
>> +
>> + nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
>> + lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
>> +
>> + if ((nsect == 0x55) && (lbal == 0xaa))
>> + return 1; /* we found a device */
>> +
>> + return 0; /* nothing found */
>> +}
>> +
>> +static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask,
>> + unsigned long deadline)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> + /* software reset. causes dev0 to be selected */
>> + pi->proto->write_regr(pi, 1, 6, ap->ctl);
>> + udelay(20); /* FIXME: flush */
>> + pi->proto->write_regr(pi, 1, 6, ap->ctl | ATA_SRST);
>> + udelay(20); /* FIXME: flush */
>> + pi->proto->write_regr(pi, 1, 6, ap->ctl);
>> + ap->last_ctl = ap->ctl;
>> +
>> + /* wait the port to become ready */
>> + return ata_sff_wait_after_reset(&ap->link, devmask, deadline);
>> +}
>> +
>> +int pata_parport_softreset(struct ata_link *link, unsigned int *classes,
>> + unsigned long deadline)
>> +{
>> + struct ata_port *ap = link->ap;
>> + unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
>> + unsigned int devmask = 0;
>> + int rc;
>> + u8 err;
>> +
>> + /* determine if device 0/1 are present */
>> + if (pata_parport_devchk(ap, 0))
>> + devmask |= (1 << 0);
>> + if (slave_possible && pata_parport_devchk(ap, 1))
>> + devmask |= (1 << 1);
>> +
>> + /* select device 0 again */
>> + ap->ops->sff_dev_select(ap, 0);
>> +
>> + /* issue bus reset */
>> + rc = pata_parport_bus_softreset(ap, devmask, deadline);
>> + /* if link is occupied, -ENODEV too is an error */
>> + if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
>> + ata_link_err(link, "SRST failed (errno=%d)\n", rc);
>> + return rc;
>> + }
>> +
>> + /* determine by signature whether we have ATA or ATAPI devices */
>> + classes[0] = ata_sff_dev_classify(&link->device[0],
>> + devmask & (1 << 0), &err);
>> + if (slave_possible && err != 0x81)
>> + classes[1] = ata_sff_dev_classify(&link->device[1],
>> + devmask & (1 << 1), &err);
>> +
>> + return 0;
>> +}
>> +
>> +u8 pata_parport_check_status(struct ata_port *ap)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> +// printk("%s\n", __FUNCTION__);
>> + return pi->proto->read_regr(pi, 0, ATA_REG_STATUS);
>> +}
>> +
>> +u8 pata_parport_check_altstatus(struct ata_port *ap)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> +// printk("%s\n", __FUNCTION__);
>> + return pi->proto->read_regr(pi, 1, 6);
>> +}
>> +
>> +void pata_parport_dev_select(struct ata_port *ap, unsigned int device)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> + u8 tmp;
>> +// printk("%s\n", __FUNCTION__);
>> + if (device == 0)
>> + tmp = ATA_DEVICE_OBS;
>> + else
>> + tmp = ATA_DEVICE_OBS | ATA_DEV1;
>> +
>> + pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tmp);
>> + ata_sff_pause(ap); /* needed; also flushes, for mmio */
>> +}
>> +
>> +void pata_parport_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> + unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
>> +// printk("%s\n", __FUNCTION__);
>> + if (tf->ctl != ap->last_ctl) {
>> + pi->proto->write_regr(pi, 1, 6, tf->ctl);
>> + ap->last_ctl = tf->ctl;
>> + ata_wait_idle(ap);
>> + }
>> +
>> + if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
>> + pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, tf->hob_feature);
>> + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, tf->hob_nsect);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAL, tf->hob_lbal);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAM, tf->hob_lbam);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAH, tf->hob_lbah);
>> + }
>> +
>> + if (is_addr) {
>> + pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, tf->feature);
>> + pi->proto->write_regr(pi, 0, ATA_REG_NSECT, tf->nsect);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAL, tf->lbal);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAM, tf->lbam);
>> + pi->proto->write_regr(pi, 0, ATA_REG_LBAH, tf->lbah);
>> + }
>> +
>> + if (tf->flags & ATA_TFLAG_DEVICE)
>> + pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tf->device);
>> +
>> + ata_wait_idle(ap);
>> +}
>> +
>> +void pata_parport_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> +// printk("%s\n", __FUNCTION__);
>> + tf->command = pi->proto->read_regr(pi, 0, ATA_REG_STATUS);
>> + tf->feature = pi->proto->read_regr(pi, 0, ATA_REG_ERR);
>> + tf->nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
>> + tf->lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
>> + tf->lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM);
>> + tf->lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH);
>> + tf->device = pi->proto->read_regr(pi, 0, ATA_REG_DEVICE);
>> +
>> + if (tf->flags & ATA_TFLAG_LBA48) {
>> + pi->proto->write_regr(pi, 1, 6, tf->ctl | ATA_HOB);
>> + tf->hob_feature = pi->proto->read_regr(pi, 0, ATA_REG_ERR);
>> + tf->hob_nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
>> + tf->hob_lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
>> + tf->hob_lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM);
>> + tf->hob_lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH);
>> + pi->proto->write_regr(pi, 1, 6, tf->ctl);
>> + ap->last_ctl = tf->ctl;
>> + }
>> +}
>> +
>> +void pata_parport_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
>> +{
>> + struct pi_adapter *pi = ap->host->private_data;
>> +// printk("%s\n", __FUNCTION__);
>> + pi->proto->write_regr(pi, 0, ATA_REG_CMD, tf->command);
>> + ata_sff_pause(ap);
>> +}
>> +
>> +unsigned int pata_parport_data_xfer(struct ata_queued_cmd *qc, unsigned char *buf,
>> + unsigned int buflen, int rw)
>> +{
>> + struct ata_port *ap = qc->dev->link->ap;
>> + struct pi_adapter *pi = ap->host->private_data;
>> +// printk("%s\n", __FUNCTION__);
>> + if (rw == READ)
>> + pi->proto->read_block(pi, buf, buflen);
>> + else
>> + pi->proto->write_block(pi, buf, buflen);
>> +
>> + return buflen;
>> +}
>> +
>> +void pata_parport_drain_fifo(struct ata_queued_cmd *qc)
>> +{
>> + int count;
>> + struct ata_port *ap;
>> + struct pi_adapter *pi;
>> + char junk[2];
>> +// printk("%s\n", __FUNCTION__);
>> + /* We only need to flush incoming data when a command was running */
>> + if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
>> + return;
>> +
>> + ap = qc->ap;
>> + pi = ap->host->private_data;
>> + /* Drain up to 64K of data before we give up this recovery method */
>> + for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ)
>> + && count < 65536; count += 2)
>> + pi->proto->read_block(pi, junk, 2);
>> +
>> + if (count)
>> + ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count);
>> +
>> +}
>> +
>> +void pata_parport_lost_interrupt(struct ata_port *ap)
>> +{
>> + u8 status;
>> + struct ata_queued_cmd *qc;
>> +// printk("%s\n", __FUNCTION__);
>> + /* Only one outstanding command per SFF channel */
>> + qc = ata_qc_from_tag(ap, ap->link.active_tag);
>> + /* We cannot lose an interrupt on a non-existent or polled command */
>> + if (!qc || qc->tf.flags & ATA_TFLAG_POLLING)
>> + return;
>> + /* See if the controller thinks it is still busy - if so the command
>> + isn't a lost IRQ but is still in progress */
>> + status = pata_parport_check_altstatus(ap);
>> + if (status & ATA_BUSY)
>> + return;
>> +
>> + /* There was a command running, we are no longer busy and we have
>> + no interrupt. */
>> + ata_port_warn(ap, "lost interrupt (Status 0x%x)\n",
>> + status);
>> + /* Run the host interrupt logic as if the interrupt had not been
>> + lost */
>> + ata_sff_port_intr(ap, qc);
>> +}
>> +
>> +static struct ata_port_operations pata_parport_port_ops = {
>> + .qc_prep = ata_noop_qc_prep,
>> + .qc_issue = ata_sff_qc_issue,
>> + .qc_fill_rtf = ata_sff_qc_fill_rtf,
>> +
>> + .freeze = ata_sff_freeze,
>> + .thaw = ata_sff_thaw,
>> + .prereset = ata_sff_prereset,
>> + .softreset = pata_parport_softreset,
>> + .postreset = ata_sff_postreset,
>> + .error_handler = ata_sff_error_handler,
>> + .sched_eh = ata_std_sched_eh,
>> + .end_eh = ata_std_end_eh,
>> +
>> + .sff_dev_select = pata_parport_dev_select,
>> + .sff_check_status = pata_parport_check_status,
>> + .sff_check_altstatus = pata_parport_check_altstatus,
>> + .sff_tf_load = pata_parport_tf_load,
>> + .sff_tf_read = pata_parport_tf_read,
>> + .sff_exec_command = pata_parport_exec_command,
>> + .sff_data_xfer = pata_parport_data_xfer,
>> + .sff_drain_fifo = pata_parport_drain_fifo,
>> +
>> + .lost_interrupt = pata_parport_lost_interrupt,
>> +};
>> +
>> +static const struct ata_port_info pata_parport_port_info = {
>> + .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING,
>> + .pio_mask = ATA_PIO0,
>> + /* No DMA */
>> + .port_ops = &pata_parport_port_ops,
>> +};
>> +
>> +int paride_register(struct pi_protocol *pr)
>> +{
>> + int k;
>> +
>> + for (k = 0; k < MAX_PROTOS; k++)
>> + if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) {
>> + printk("paride: %s protocol already registered\n",
>> + pr->name);
>> + return -1;
>> + }
>> + k = 0;
>> + while ((k < MAX_PROTOS) && (protocols[k]))
>> + k++;
>> + if (k == MAX_PROTOS) {
>> + printk("paride: protocol table full\n");
>> + return -1;
>> + }
>> + protocols[k] = pr;
>> + pr->index = k;
>> + printk("paride: %s registered as protocol %d\n", pr->name, k);
>> + return 0;
>> +}
>> +
>> +EXPORT_SYMBOL(paride_register);
>> +
>> +void paride_unregister(struct pi_protocol *pr)
>> +{
>> + if (!pr)
>> + return;
>> + if (protocols[pr->index] != pr) {
>> + printk("paride: %s not registered\n", pr->name);
>> + return;
>> + }
>> + protocols[pr->index] = NULL;
>> +}
>> +
>> +EXPORT_SYMBOL(paride_unregister);
>> +
>> +
>> +
>> +static DEFINE_SPINLOCK(pi_spinlock);
>> +
>> +static void pi_wake_up(void *p)
>> +{
>> + PIA *pi = (PIA *) p;
>> + unsigned long flags;
>> + void (*cont) (void) = NULL;
>> +
>> + spin_lock_irqsave(&pi_spinlock, flags);
>> +
>> + if (pi->claim_cont && !parport_claim(pi->pardev)) {
>> + cont = pi->claim_cont;
>> + pi->claim_cont = NULL;
>> + pi->claimed = 1;
>> + }
>> +
>> + spin_unlock_irqrestore(&pi_spinlock, flags);
>> +
>> + wake_up(&(pi->parq));
>> +
>> + if (cont)
>> + cont();
>> +}
>> +
>> +static void pi_claim(PIA * pi)
>> +{
>> + if (pi->claimed)
>> + return;
>> + pi->claimed = 1;
>> + if (pi->pardev)
>> + wait_event(pi->parq,
>> + !parport_claim((struct pardevice *) pi->pardev));
>> +}
>> +
>> +static void pi_unclaim(PIA * pi)
>> +{
>> + pi->claimed = 0;
>> + if (pi->pardev)
>> + parport_release((struct pardevice *) (pi->pardev));
>> +}
>> +
>> +static void pi_unregister_parport(PIA * pi)
>> +{
>> + if (pi->pardev) {
>> + parport_unregister_device((struct pardevice *) (pi->pardev));
>> + pi->pardev = NULL;
>> + }
>> +}
>> +
>> +static int default_test_proto(PIA * pi, char *scratch, int verbose)
>> +{
>> + int j, k;
>> + int e[2] = { 0, 0 };
>> +
>> + pi->proto->connect(pi);
>> +
>> + for (j = 0; j < 2; j++) {
>> + pi->proto->write_regr(pi, 0, 6, 0xa0 + j * 0x10);
>> + for (k = 0; k < 256; k++) {
>> + pi->proto->write_regr(pi, 0, 2, k ^ 0xaa);
>> + pi->proto->write_regr(pi, 0, 3, k ^ 0x55);
>> + if (pi->proto->read_regr(pi, 0, 2) != (k ^ 0xaa))
>> + e[j]++;
>> + }
>> + }
>> + pi->proto->disconnect(pi);
>> +
>> + if (verbose)
>> + printk("%s: %s: port 0x%x, mode %d, test=(%d,%d)\n",
>> + pi->device, pi->proto->name, pi->port,
>> + pi->mode, e[0], e[1]);
>> +
>> + return (e[0] && e[1]); /* not here if both > 0 */
>> +}
>> +
>> +static int pi_test_proto(PIA * pi, char *scratch, int verbose)
>> +{
>> + int res;
>> +
>> + pi_claim(pi);
>> + if (pi->proto->test_proto)
>> + res = pi->proto->test_proto(pi, scratch, verbose);
>> + else
>> + res = default_test_proto(pi, scratch, verbose);
>> + pi_unclaim(pi);
>> +
>> + return res;
>> +}
>> +
>> +static int pi_register_parport(PIA *pi, int verbose, int unit)
>> +{
>> + struct parport *port;
>> + struct pardev_cb par_cb;
>> +
>> + port = parport_find_base(pi->port);
>> + if (!port)
>> + return 0;
>> + memset(&par_cb, 0, sizeof(par_cb));
>> + par_cb.wakeup = pi_wake_up;
>> + par_cb.private = (void *)pi;
>> + pi->pardev = parport_register_dev_model(port, pi->device, &par_cb,
>> + unit);
>> + parport_put_port(port);
>> + if (!pi->pardev)
>> + return 0;
>> +
>> + init_waitqueue_head(&pi->parq);
>> +
>> + if (verbose)
>> + printk("%s: 0x%x is %s\n", pi->device, pi->port, port->name);
>> +
>> + pi->parname = (char *) port->name;
>> +
>> + return 1;
>> +}
>> +
>> +static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose)
>> +{
>> + int best, range;
>> +
>> + if (pi->mode != -1) {
>> + if (pi->mode >= max)
>> + return 0;
>> + range = 3;
>> + if (pi->mode >= pi->proto->epp_first)
>> + range = 8;
>> + if ((range == 8) && (pi->port % 8))
>> + return 0;
>> + pi->reserved = range;
>> + return (!pi_test_proto(pi, scratch, verbose));
>> + }
>> + best = -1;
>> + for (pi->mode = 0; pi->mode < max; pi->mode++) {
>> + range = 3;
>> + if (pi->mode >= pi->proto->epp_first)
>> + range = 8;
>> + if ((range == 8) && (pi->port % 8))
>> + break;
>> + pi->reserved = range;
>> + if (!pi_test_proto(pi, scratch, verbose))
>> + best = pi->mode;
>> + }
>> + pi->mode = best;
>> + return (best > -1);
>> +}
>> +
>> +
>> +static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose)
>> +{
>> + int max, s, e;
>> +
>> + s = unit;
>> + e = s + 1;
>> +
>> + if (s == -1) {
>> + s = 0;
>> + e = pi->proto->max_units;
>> + }
>> +
>> + if (!pi_register_parport(pi, verbose, s))
>> + return 0;
>> +
>> + if (pi->proto->test_port) {
>> + pi_claim(pi);
>> + max = pi->proto->test_port(pi);
>> + pi_unclaim(pi);
>> + } else
>> + max = pi->proto->max_mode;
>> +
>> + if (pi->proto->probe_unit) {
>> + pi_claim(pi);
>> + for (pi->unit = s; pi->unit < e; pi->unit++)
>> + if (pi->proto->probe_unit(pi)) {
>> + pi_unclaim(pi);
>> + if (pi_probe_mode(pi, max, scratch, verbose))
>> + return 1;
>> + pi_unregister_parport(pi);
>> + return 0;
>> + }
>> + pi_unclaim(pi);
>> + pi_unregister_parport(pi);
>> + return 0;
>> + }
>> +
>> + if (!pi_probe_mode(pi, max, scratch, verbose)) {
>> + pi_unregister_parport(pi);
>> + return 0;
>> + }
>> + return 1;
>> +
>> +}
>> +
>> +int pi_init(PIA * pi, int autoprobe, int port, int mode,
>> + int unit, int protocol, int delay, char *scratch,
>> + int devtype, int verbose, char *device)
>> +{
>> + int p, k, s, e;
>> + int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 };
>> +
>> + s = protocol;
>> + e = s + 1;
>> +
>> + if (!protocols[0])
>> + request_module("paride_protocol");
>> +
>> + if (autoprobe) {
>> + s = 0;
>> + e = MAX_PROTOS;
>> + } else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) ||
>> + (!protocols[s]) || (unit < 0) ||
>> + (unit >= protocols[s]->max_units)) {
>> + printk("%s: Invalid parameters\n", device);
>> + return 0;
>> + }
>> +
>> + for (p = s; p < e; p++) {
>> + struct pi_protocol *proto = protocols[p];
>> + if (!proto)
>> + continue;
>> + /* still racy */
>> + if (!try_module_get(proto->owner))
>> + continue;
>> + pi->proto = proto;
>> + pi->private = 0;
>> + if (proto->init_proto && proto->init_proto(pi) < 0) {
>> + pi->proto = NULL;
>> + module_put(proto->owner);
>> + continue;
>> + }
>> + if (delay == -1)
>> + pi->delay = pi->proto->default_delay;
>> + else
>> + pi->delay = delay;
>> + pi->devtype = devtype;
>> + pi->device = device;
>> +
>> + pi->parname = NULL;
>> + pi->pardev = NULL;
>> + init_waitqueue_head(&pi->parq);
>> + pi->claimed = 0;
>> + pi->claim_cont = NULL;
>> +
>> + pi->mode = mode;
>> + if (port != -1) {
>> + pi->port = port;
>> + if (pi_probe_unit(pi, unit, scratch, verbose))
>> + break;
>> + pi->port = 0;
>> + } else {
>> + k = 0;
>> + while ((pi->port = lpts[k++]))
>> + if (pi_probe_unit
>> + (pi, unit, scratch, verbose))
>> + break;
>> + if (pi->port)
>> + break;
>> + }
>> + if (pi->proto->release_proto)
>> + pi->proto->release_proto(pi);
>> + module_put(proto->owner);
>> + }
>> +
>> + if (!pi->port) {
>> + if (autoprobe)
>> + printk("%s: Autoprobe failed\n", device);
>> + else
>> + printk("%s: Adapter not found\n", device);
>> + return 0;
>> + }
>> +
>> + if (pi->parname)
>> + printk("%s: Sharing %s at 0x%x\n", pi->device,
>> + pi->parname, pi->port);
>> +
>> + pi->proto->log_adapter(pi, scratch, verbose);
>> +
>> + return 1;
>> +}
>> +
>> +static struct scsi_host_template pata_parport_sht = {
>> + ATA_PIO_SHT(DRV_NAME),
>> +};
>> +
>> +static ssize_t new_device_store(struct bus_type *bus, const char *buf, size_t count)
>> +{
>> + struct pi_adapter *pi;
>> + int retval;
>> + int autoprobe, port, mode, unit, protocol, delay;
>> + int fields = 0;
>> + struct device dev;
>> + const struct ata_port_info *ppi[] = { &pata_parport_port_info };
>> + struct ata_host *host;
>> + char scratch[512];
>> +
>> + fields = sscanf(buf, "%x %d %d %d %d",
>> + &port, &mode, &unit, &protocol, &delay);
>> + if (fields < 5)
>> + return -EINVAL;
>> +
>> + memset(&dev, 0, sizeof(dev));
>> + dev.parent = bus->dev_root;
>> + dev.bus = bus;
>> + dev_set_name(&dev, "pata_parport%d", 0);////
>> + retval = device_register(&dev);
>> + if (retval) {
>> + printk("register failed\n");
>> + return retval;
>> + }
>> +
>> + pi = devm_kzalloc(&dev, sizeof(struct pi_adapter), GFP_KERNEL);
>> + if (!pi) {
>> + //device_unregister
>> + return -ENOMEM;
>> + }
>> +
>> + if (!pi_init(pi, autoprobe, port, mode, unit, protocol, delay, scratch, PI_PD, 2, "xxx"))
>> + return -ENODEV;
>> +
>> + printk("pi_init ok!\n");
>> + pi_claim(pi);
>> + pi->proto->connect(pi);
>> + host = ata_host_alloc_pinfo(&dev, ppi, 1);
>> + if (!host) {
>> + /* pi_deinit??? */
>> + return -ENOMEM;
>> + }
>> + host->private_data = pi;
>> + printk("alloc_ok!\n");
>> + if (ata_host_activate(host, 0, NULL, 0, &pata_parport_sht)) {
>> + /* dealloc, pi_deinit??? */
>> + return -EIO;
>> + }
>> +
>> + return count;
>> +}
>> +static BUS_ATTR_WO(new_device);
>> +
>> +static struct bus_type pata_parport_bus = {
>> + .name = "pata_parport",
>> +};
>> +
>> +static __init int pata_parport_init(void)
>> +{
>> + int error;
>> +
>> + error = bus_register(&pata_parport_bus);
>> + if (error) {
>> + pr_err("failed to register pata_parport bus, error: %d\n", error);
>> + return error;
>> + }
>> + error = bus_create_file(&pata_parport_bus, &bus_attr_new_device);
>> + if (error) {
>> + pr_err("unable to create sysfs file, error: %d\n", error);
>> + return error;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static __exit void pata_parport_exit(void)
>> +{
>> + bus_remove_file(&pata_parport_bus, &bus_attr_new_device);
>> + bus_unregister(&pata_parport_bus);
>> +}
>> +
>> +MODULE_AUTHOR("Ondrej Zary");
>> +MODULE_DESCRIPTION("driver for parallel port ATA adapters");
>> +MODULE_LICENSE("GPL");
>> +MODULE_ALIAS("paride");
>> +
>> +module_init(pata_parport_init);
>> +module_exit(pata_parport_exit);
>> --
>> Ondrej Zary
> ---end quoted text---
>
--
Damien Le Moal
Western Digital Research
