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kernel/drivers/s390/char/raw3270.c

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// SPDX-License-Identifier: GPL-2.0
/*
* IBM/3270 Driver - core functions.
*
* Author(s):
* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
* Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
* Copyright IBM Corp. 2003, 2009
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include <asm/ebcdic.h>
#include <asm/diag.h>
#include "raw3270.h"
#include <linux/major.h>
#include <linux/kdev_t.h>
#include <linux/device.h>
#include <linux/mutex.h>
struct class *class3270;
/* The main 3270 data structure. */
struct raw3270 {
struct list_head list;
struct ccw_device *cdev;
int minor;
short model, rows, cols;
unsigned int state;
unsigned long flags;
struct list_head req_queue; /* Request queue. */
struct list_head view_list; /* List of available views. */
struct raw3270_view *view; /* Active view. */
struct timer_list timer; /* Device timer. */
unsigned char *ascebc; /* ascii -> ebcdic table */
struct raw3270_view init_view;
struct raw3270_request init_reset;
struct raw3270_request init_readpart;
struct raw3270_request init_readmod;
unsigned char init_data[256];
};
/* raw3270->state */
#define RAW3270_STATE_INIT 0 /* Initial state */
#define RAW3270_STATE_RESET 1 /* Reset command is pending */
#define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */
#define RAW3270_STATE_READMOD 3 /* Read partition is pending */
#define RAW3270_STATE_READY 4 /* Device is usable by views */
/* raw3270->flags */
#define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
#define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
#define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */
/* Semaphore to protect global data of raw3270 (devices, views, etc). */
static DEFINE_MUTEX(raw3270_mutex);
/* List of 3270 devices. */
static LIST_HEAD(raw3270_devices);
/*
* Flag to indicate if the driver has been registered. Some operations
* like waiting for the end of i/o need to be done differently as long
* as the kernel is still starting up (console support).
*/
static int raw3270_registered;
/* Module parameters */
static bool tubxcorrect;
module_param(tubxcorrect, bool, 0);
/*
* Wait queue for device init/delete, view delete.
*/
DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
static void __raw3270_disconnect(struct raw3270 *rp);
/*
* Encode array for 12 bit 3270 addresses.
*/
static unsigned char raw3270_ebcgraf[64] = {
0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
};
static inline int raw3270_state_ready(struct raw3270 *rp)
{
return rp->state == RAW3270_STATE_READY;
}
void raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
{
if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
cp[0] = (addr >> 8) & 0x3f;
cp[1] = addr & 0xff;
} else {
cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
cp[1] = raw3270_ebcgraf[addr & 0x3f];
}
}
/*
* Allocate a new 3270 ccw request
*/
struct raw3270_request *raw3270_request_alloc(size_t size)
{
struct raw3270_request *rq;
/* Allocate request structure */
rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
if (!rq)
return ERR_PTR(-ENOMEM);
/* alloc output buffer. */
if (size > 0) {
rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
if (!rq->buffer) {
kfree(rq);
return ERR_PTR(-ENOMEM);
}
}
rq->size = size;
INIT_LIST_HEAD(&rq->list);
/*
* Setup ccw.
*/
rq->ccw.cda = __pa(rq->buffer);
rq->ccw.flags = CCW_FLAG_SLI;
return rq;
}
/*
* Free 3270 ccw request
*/
void raw3270_request_free(struct raw3270_request *rq)
{
kfree(rq->buffer);
kfree(rq);
}
/*
* Reset request to initial state.
*/
void raw3270_request_reset(struct raw3270_request *rq)
{
BUG_ON(!list_empty(&rq->list));
rq->ccw.cmd_code = 0;
rq->ccw.count = 0;
rq->ccw.cda = __pa(rq->buffer);
rq->ccw.flags = CCW_FLAG_SLI;
rq->rescnt = 0;
rq->rc = 0;
}
/*
* Set command code to ccw of a request.
*/
void raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
{
rq->ccw.cmd_code = cmd;
}
/*
* Add data fragment to output buffer.
*/
int raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
{
if (size + rq->ccw.count > rq->size)
return -E2BIG;
memcpy(rq->buffer + rq->ccw.count, data, size);
rq->ccw.count += size;
return 0;
}
/*
* Set address/length pair to ccw of a request.
*/
void raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
{
rq->ccw.cda = __pa(data);
rq->ccw.count = size;
}
/*
* Set idal buffer to ccw of a request.
*/
void raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
{
rq->ccw.cda = __pa(ib->data);
rq->ccw.count = ib->size;
rq->ccw.flags |= CCW_FLAG_IDA;
}
/*
* Add the request to the request queue, try to start it if the
* 3270 device is idle. Return without waiting for end of i/o.
*/
static int __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
struct raw3270_request *rq)
{
rq->view = view;
raw3270_get_view(view);
if (list_empty(&rp->req_queue) &&
!test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
/* No other requests are on the queue. Start this one. */
rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
(unsigned long) rq, 0, 0);
if (rq->rc) {
raw3270_put_view(view);
return rq->rc;
}
}
list_add_tail(&rq->list, &rp->req_queue);
return 0;
}
int raw3270_view_active(struct raw3270_view *view)
{
struct raw3270 *rp = view->dev;
return rp && rp->view == view;
}
int raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
{
unsigned long flags;
struct raw3270 *rp;
int rc;
spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
rp = view->dev;
if (!rp || rp->view != view)
rc = -EACCES;
else if (!raw3270_state_ready(rp))
rc = -EBUSY;
else
rc = __raw3270_start(rp, view, rq);
spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
return rc;
}
int raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
{
struct raw3270 *rp;
int rc;
rp = view->dev;
if (!rp || rp->view != view)
rc = -EACCES;
else if (!raw3270_state_ready(rp))
rc = -EBUSY;
else
rc = __raw3270_start(rp, view, rq);
return rc;
}
int raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
{
struct raw3270 *rp;
rp = view->dev;
rq->view = view;
raw3270_get_view(view);
list_add_tail(&rq->list, &rp->req_queue);
return 0;
}
/*
* 3270 interrupt routine, called from the ccw_device layer
*/
static void raw3270_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
{
struct raw3270 *rp;
struct raw3270_view *view;
struct raw3270_request *rq;
rp = dev_get_drvdata(&cdev->dev);
if (!rp)
return;
rq = (struct raw3270_request *) intparm;
view = rq ? rq->view : rp->view;
if (!IS_ERR(irb)) {
/* Handle CE-DE-UE and subsequent UDE */
if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END)
clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END |
DEV_STAT_DEV_END |
DEV_STAT_UNIT_EXCEP))
set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
/* Handle disconnected devices */
if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
(irb->ecw[0] & SNS0_INTERVENTION_REQ)) {
set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
if (rp->state > RAW3270_STATE_RESET)
__raw3270_disconnect(rp);
}
/* Call interrupt handler of the view */
if (view)
view->fn->intv(view, rq, irb);
}
if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags))
/* Device busy, do not start I/O */
return;
if (rq && !list_empty(&rq->list)) {
/* The request completed, remove from queue and do callback. */
list_del_init(&rq->list);
if (rq->callback)
rq->callback(rq, rq->callback_data);
/* Do put_device for get_device in raw3270_start. */
raw3270_put_view(view);
}
/*
* Try to start each request on request queue until one is
* started successful.
*/
while (!list_empty(&rp->req_queue)) {
rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
(unsigned long) rq, 0, 0);
if (rq->rc == 0)
break;
/* Start failed. Remove request and do callback. */
list_del_init(&rq->list);
if (rq->callback)
rq->callback(rq, rq->callback_data);
/* Do put_device for get_device in raw3270_start. */
raw3270_put_view(view);
}
}
/*
* To determine the size of the 3270 device we need to do:
* 1) send a 'read partition' data stream to the device
* 2) wait for the attn interrupt that precedes the query reply
* 3) do a read modified to get the query reply
* To make things worse we have to cope with intervention
* required (3270 device switched to 'stand-by') and command
* rejects (old devices that can't do 'read partition').
*/
struct raw3270_ua { /* Query Reply structure for Usable Area */
struct { /* Usable Area Query Reply Base */
short l; /* Length of this structured field */
char sfid; /* 0x81 if Query Reply */
char qcode; /* 0x81 if Usable Area */
char flags0;
char flags1;
short w; /* Width of usable area */
short h; /* Heigth of usavle area */
char units; /* 0x00:in; 0x01:mm */
int xr;
int yr;
char aw;
char ah;
short buffsz; /* Character buffer size, bytes */
char xmin;
char ymin;
char xmax;
char ymax;
} __packed uab;
struct { /* Alternate Usable Area Self-Defining Parameter */
char l; /* Length of this Self-Defining Parm */
char sdpid; /* 0x02 if Alternate Usable Area */
char res;
char auaid; /* 0x01 is Id for the A U A */
short wauai; /* Width of AUAi */
short hauai; /* Height of AUAi */
char auaunits; /* 0x00:in, 0x01:mm */
int auaxr;
int auayr;
char awauai;
char ahauai;
} __packed aua;
} __packed;
static void raw3270_size_device_vm(struct raw3270 *rp)
{
int rc, model;
struct ccw_dev_id dev_id;
struct diag210 diag_data;
struct diag8c diag8c_data;
ccw_device_get_id(rp->cdev, &dev_id);
rc = diag8c(&diag8c_data, &dev_id);
if (!rc) {
rp->model = 2;
rp->rows = diag8c_data.height;
rp->cols = diag8c_data.width;
if (diag8c_data.flags & 1)
set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
return;
}
diag_data.vrdcdvno = dev_id.devno;
diag_data.vrdclen = sizeof(struct diag210);
rc = diag210(&diag_data);
model = diag_data.vrdccrmd;
/* Use default model 2 if the size could not be detected */
if (rc || model < 2 || model > 5)
model = 2;
switch (model) {
case 2:
rp->model = model;
rp->rows = 24;
rp->cols = 80;
break;
case 3:
rp->model = model;
rp->rows = 32;
rp->cols = 80;
break;
case 4:
rp->model = model;
rp->rows = 43;
rp->cols = 80;
break;
case 5:
rp->model = model;
rp->rows = 27;
rp->cols = 132;
break;
}
}
static void raw3270_size_device(struct raw3270 *rp)
{
struct raw3270_ua *uap;
/* Got a Query Reply */
uap = (struct raw3270_ua *) (rp->init_data + 1);
/* Paranoia check. */
if (rp->init_readmod.rc || rp->init_data[0] != 0x88 ||
uap->uab.qcode != 0x81) {
/* Couldn't detect size. Use default model 2. */
rp->model = 2;
rp->rows = 24;
rp->cols = 80;
return;
}
/* Copy rows/columns of default Usable Area */
rp->rows = uap->uab.h;
rp->cols = uap->uab.w;
/* Check for 14 bit addressing */
if ((uap->uab.flags0 & 0x0d) == 0x01)
set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
/* Check for Alternate Usable Area */
if (uap->uab.l == sizeof(struct raw3270_ua) &&
uap->aua.sdpid == 0x02) {
rp->rows = uap->aua.hauai;
rp->cols = uap->aua.wauai;
}
/* Try to find a model. */
rp->model = 0;
if (rp->rows == 24 && rp->cols == 80)
rp->model = 2;
if (rp->rows == 32 && rp->cols == 80)
rp->model = 3;
if (rp->rows == 43 && rp->cols == 80)
rp->model = 4;
if (rp->rows == 27 && rp->cols == 132)
rp->model = 5;
}
static void raw3270_size_device_done(struct raw3270 *rp)
{
struct raw3270_view *view;
rp->view = NULL;
rp->state = RAW3270_STATE_READY;
/* Notify views about new size */
list_for_each_entry(view, &rp->view_list, list)
if (view->fn->resize)
view->fn->resize(view, rp->model, rp->rows, rp->cols);
/* Setup processing done, now activate a view */
list_for_each_entry(view, &rp->view_list, list) {
rp->view = view;
if (view->fn->activate(view) == 0)
break;
rp->view = NULL;
}
}
static void raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
{
struct raw3270 *rp = rq->view->dev;
raw3270_size_device(rp);
raw3270_size_device_done(rp);
}
static void raw3270_read_modified(struct raw3270 *rp)
{
if (rp->state != RAW3270_STATE_W4ATTN)
return;
/* Use 'read modified' to get the result of a read partition. */
memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
memset(&rp->init_data, 0, sizeof(rp->init_data));
rp->init_readmod.ccw.cmd_code = TC_READMOD;
rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
rp->init_readmod.ccw.count = sizeof(rp->init_data);
rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data);
rp->init_readmod.callback = raw3270_read_modified_cb;
rp->state = RAW3270_STATE_READMOD;
raw3270_start_irq(&rp->init_view, &rp->init_readmod);
}
static void raw3270_writesf_readpart(struct raw3270 *rp)
{
static const unsigned char wbuf[] =
{ 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
/* Store 'read partition' data stream to init_data */
memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
memset(&rp->init_data, 0, sizeof(rp->init_data));
memcpy(&rp->init_data, wbuf, sizeof(wbuf));
rp->init_readpart.ccw.cmd_code = TC_WRITESF;
rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
rp->init_readpart.ccw.count = sizeof(wbuf);
rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data);
rp->state = RAW3270_STATE_W4ATTN;
raw3270_start_irq(&rp->init_view, &rp->init_readpart);
}
/*
* Device reset
*/
static void raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
{
struct raw3270 *rp = rq->view->dev;
if (rp->state != RAW3270_STATE_RESET)
return;
if (rq->rc) {
/* Reset command failed. */
rp->state = RAW3270_STATE_INIT;
} else if (MACHINE_IS_VM) {
raw3270_size_device_vm(rp);
raw3270_size_device_done(rp);
} else
raw3270_writesf_readpart(rp);
memset(&rp->init_reset, 0, sizeof(rp->init_reset));
}
static int __raw3270_reset_device(struct raw3270 *rp)
{
int rc;
/* Check if reset is already pending */
if (rp->init_reset.view)
return -EBUSY;
/* Store reset data stream to init_data/init_reset */
rp->init_data[0] = TW_KR;
rp->init_reset.ccw.cmd_code = TC_EWRITEA;
rp->init_reset.ccw.flags = CCW_FLAG_SLI;
rp->init_reset.ccw.count = 1;
rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data);
rp->init_reset.callback = raw3270_reset_device_cb;
rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
if (rc == 0 && rp->state == RAW3270_STATE_INIT)
rp->state = RAW3270_STATE_RESET;
return rc;
}
static int raw3270_reset_device(struct raw3270 *rp)
{
unsigned long flags;
int rc;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
rc = __raw3270_reset_device(rp);
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
return rc;
}
int raw3270_reset(struct raw3270_view *view)
{
struct raw3270 *rp;
int rc;
rp = view->dev;
if (!rp || rp->view != view)
rc = -EACCES;
else if (!raw3270_state_ready(rp))
rc = -EBUSY;
else
rc = raw3270_reset_device(view->dev);
return rc;
}
static void __raw3270_disconnect(struct raw3270 *rp)
{
struct raw3270_request *rq;
struct raw3270_view *view;
rp->state = RAW3270_STATE_INIT;
rp->view = &rp->init_view;
/* Cancel all queued requests */
while (!list_empty(&rp->req_queue)) {
rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
view = rq->view;
rq->rc = -EACCES;
list_del_init(&rq->list);
if (rq->callback)
rq->callback(rq, rq->callback_data);
raw3270_put_view(view);
}
/* Start from scratch */
__raw3270_reset_device(rp);
}
static void raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
struct irb *irb)
{
struct raw3270 *rp;
if (rq) {
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
if (irb->ecw[0] & SNS0_CMD_REJECT)
rq->rc = -EOPNOTSUPP;
else
rq->rc = -EIO;
}
}
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
/* Queue read modified after attention interrupt */
rp = view->dev;
raw3270_read_modified(rp);
}
}
static struct raw3270_fn raw3270_init_fn = {
.intv = raw3270_init_irq
};
/*
* Setup new 3270 device.
*/
static int raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp,
char *ascebc)
{
struct list_head *l;
struct raw3270 *tmp;
int minor;
memset(rp, 0, sizeof(struct raw3270));
/* Copy ebcdic -> ascii translation table. */
memcpy(ascebc, _ascebc, 256);
if (tubxcorrect) {
/* correct brackets and circumflex */
ascebc['['] = 0xad;
ascebc[']'] = 0xbd;
ascebc['^'] = 0xb0;
}
rp->ascebc = ascebc;
/* Set defaults. */
rp->rows = 24;
rp->cols = 80;
INIT_LIST_HEAD(&rp->req_queue);
INIT_LIST_HEAD(&rp->view_list);
rp->init_view.dev = rp;
rp->init_view.fn = &raw3270_init_fn;
rp->view = &rp->init_view;
/*
* Add device to list and find the smallest unused minor
* number for it. Note: there is no device with minor 0,
* see special case for fs3270.c:fs3270_open().
*/
mutex_lock(&raw3270_mutex);
/* Keep the list sorted. */
minor = RAW3270_FIRSTMINOR;
rp->minor = -1;
list_for_each(l, &raw3270_devices) {
tmp = list_entry(l, struct raw3270, list);
if (tmp->minor > minor) {
rp->minor = minor;
__list_add(&rp->list, l->prev, l);
break;
}
minor++;
}
if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
rp->minor = minor;
list_add_tail(&rp->list, &raw3270_devices);
}
mutex_unlock(&raw3270_mutex);
/* No free minor number? Then give up. */
if (rp->minor == -1)
return -EUSERS;
rp->cdev = cdev;
dev_set_drvdata(&cdev->dev, rp);
cdev->handler = raw3270_irq;
return 0;
}
#ifdef CONFIG_TN3270_CONSOLE
/* Tentative definition - see below for actual definition. */
static struct ccw_driver raw3270_ccw_driver;
static inline int raw3270_state_final(struct raw3270 *rp)
{
return rp->state == RAW3270_STATE_INIT ||
rp->state == RAW3270_STATE_READY;
}
/*
* Setup 3270 device configured as console.
*/
struct raw3270 __init *raw3270_setup_console(void)
{
struct ccw_device *cdev;
unsigned long flags;
struct raw3270 *rp;
char *ascebc;
int rc;
cdev = ccw_device_create_console(&raw3270_ccw_driver);
if (IS_ERR(cdev))
return ERR_CAST(cdev);
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
ascebc = kzalloc(256, GFP_KERNEL);
rc = raw3270_setup_device(cdev, rp, ascebc);
if (rc)
return ERR_PTR(rc);
set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
rc = ccw_device_enable_console(cdev);
if (rc) {
ccw_device_destroy_console(cdev);
return ERR_PTR(rc);
}
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
do {
__raw3270_reset_device(rp);
while (!raw3270_state_final(rp)) {
ccw_device_wait_idle(rp->cdev);
barrier();
}
} while (rp->state != RAW3270_STATE_READY);
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
return rp;
}
void raw3270_wait_cons_dev(struct raw3270 *rp)
{
unsigned long flags;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
ccw_device_wait_idle(rp->cdev);
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
}
#endif
/*
* Create a 3270 device structure.
*/
static struct raw3270 *raw3270_create_device(struct ccw_device *cdev)
{
struct raw3270 *rp;
char *ascebc;
int rc;
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
if (!rp)
return ERR_PTR(-ENOMEM);
ascebc = kmalloc(256, GFP_KERNEL);
if (!ascebc) {
kfree(rp);
return ERR_PTR(-ENOMEM);
}
rc = raw3270_setup_device(cdev, rp, ascebc);
if (rc) {
kfree(rp->ascebc);
kfree(rp);
rp = ERR_PTR(rc);
}
/* Get reference to ccw_device structure. */
get_device(&cdev->dev);
return rp;
}
/*
* This helper just validates that it is safe to activate a
* view in the panic() context, due to locking restrictions.
*/
int raw3270_view_lock_unavailable(struct raw3270_view *view)
{
struct raw3270 *rp = view->dev;
if (!rp)
return -ENODEV;
if (spin_is_locked(get_ccwdev_lock(rp->cdev)))
return -EBUSY;
return 0;
}
/*
* Activate a view.
*/
int raw3270_activate_view(struct raw3270_view *view)
{
struct raw3270 *rp;
struct raw3270_view *oldview, *nv;
unsigned long flags;
int rc;
rp = view->dev;
if (!rp)
return -ENODEV;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
if (rp->view == view)
rc = 0;
else if (!raw3270_state_ready(rp))
rc = -EBUSY;
else {
oldview = NULL;
if (rp->view && rp->view->fn->deactivate) {
oldview = rp->view;
oldview->fn->deactivate(oldview);
}
rp->view = view;
rc = view->fn->activate(view);
if (rc) {
/* Didn't work. Try to reactivate the old view. */
rp->view = oldview;
if (!oldview || oldview->fn->activate(oldview) != 0) {
/* Didn't work as well. Try any other view. */
list_for_each_entry(nv, &rp->view_list, list)
if (nv != view && nv != oldview) {
rp->view = nv;
if (nv->fn->activate(nv) == 0)
break;
rp->view = NULL;
}
}
}
}
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
return rc;
}
/*
* Deactivate current view.
*/
void raw3270_deactivate_view(struct raw3270_view *view)
{
unsigned long flags;
struct raw3270 *rp;
rp = view->dev;
if (!rp)
return;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
if (rp->view == view) {
view->fn->deactivate(view);
rp->view = NULL;
/* Move deactivated view to end of list. */
list_del_init(&view->list);
list_add_tail(&view->list, &rp->view_list);
/* Try to activate another view. */
if (raw3270_state_ready(rp)) {
list_for_each_entry(view, &rp->view_list, list) {
rp->view = view;
if (view->fn->activate(view) == 0)
break;
rp->view = NULL;
}
}
}
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
}
/*
* Add view to device with minor "minor".
*/
int raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn,
int minor, int subclass)
{
unsigned long flags;
struct raw3270 *rp;
int rc;
if (minor <= 0)
return -ENODEV;
mutex_lock(&raw3270_mutex);
rc = -ENODEV;
list_for_each_entry(rp, &raw3270_devices, list) {
if (rp->minor != minor)
continue;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
atomic_set(&view->ref_count, 2);
view->dev = rp;
view->fn = fn;
view->model = rp->model;
view->rows = rp->rows;
view->cols = rp->cols;
view->ascebc = rp->ascebc;
spin_lock_init(&view->lock);
lockdep_set_subclass(&view->lock, subclass);
list_add(&view->list, &rp->view_list);
rc = 0;
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
break;
}
mutex_unlock(&raw3270_mutex);
return rc;
}
/*
* Find specific view of device with minor "minor".
*/
struct raw3270_view *raw3270_find_view(struct raw3270_fn *fn, int minor)
{
struct raw3270 *rp;
struct raw3270_view *view, *tmp;
unsigned long flags;
mutex_lock(&raw3270_mutex);
view = ERR_PTR(-ENODEV);
list_for_each_entry(rp, &raw3270_devices, list) {
if (rp->minor != minor)
continue;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
list_for_each_entry(tmp, &rp->view_list, list) {
if (tmp->fn == fn) {
raw3270_get_view(tmp);
view = tmp;
break;
}
}
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
break;
}
mutex_unlock(&raw3270_mutex);
return view;
}
/*
* Remove view from device and free view structure via call to view->fn->free.
*/
void raw3270_del_view(struct raw3270_view *view)
{
unsigned long flags;
struct raw3270 *rp;
struct raw3270_view *nv;
rp = view->dev;
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
if (rp->view == view) {
view->fn->deactivate(view);
rp->view = NULL;
}
list_del_init(&view->list);
if (!rp->view && raw3270_state_ready(rp)) {
/* Try to activate another view. */
list_for_each_entry(nv, &rp->view_list, list) {
if (nv->fn->activate(nv) == 0) {
rp->view = nv;
break;
}
}
}
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
/* Wait for reference counter to drop to zero. */
atomic_dec(&view->ref_count);
wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
if (view->fn->free)
view->fn->free(view);
}
/*
* Remove a 3270 device structure.
*/
static void raw3270_delete_device(struct raw3270 *rp)
{
struct ccw_device *cdev;
/* Remove from device chain. */
mutex_lock(&raw3270_mutex);
list_del_init(&rp->list);
mutex_unlock(&raw3270_mutex);
/* Disconnect from ccw_device. */
cdev = rp->cdev;
rp->cdev = NULL;
dev_set_drvdata(&cdev->dev, NULL);
cdev->handler = NULL;
/* Put ccw_device structure. */
put_device(&cdev->dev);
/* Now free raw3270 structure. */
kfree(rp->ascebc);
kfree(rp);
}
static int raw3270_probe(struct ccw_device *cdev)
{
return 0;
}
/*
* Additional attributes for a 3270 device
*/
static ssize_t model_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "%i\n",
((struct raw3270 *)dev_get_drvdata(dev))->model);
}
static DEVICE_ATTR_RO(model);
static ssize_t rows_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "%i\n",
((struct raw3270 *)dev_get_drvdata(dev))->rows);
}
static DEVICE_ATTR_RO(rows);
static ssize_t
columns_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "%i\n",
((struct raw3270 *)dev_get_drvdata(dev))->cols);
}
static DEVICE_ATTR_RO(columns);
static struct attribute * raw3270_attrs[] = {
&dev_attr_model.attr,
&dev_attr_rows.attr,
&dev_attr_columns.attr,
NULL,
};
static const struct attribute_group raw3270_attr_group = {
.attrs = raw3270_attrs,
};
static int raw3270_create_attributes(struct raw3270 *rp)
{
return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
}
/*
* Notifier for device addition/removal
*/
static LIST_HEAD(raw3270_notifier);
int raw3270_register_notifier(struct raw3270_notifier *notifier)
{
struct raw3270 *rp;
mutex_lock(&raw3270_mutex);
list_add_tail(&notifier->list, &raw3270_notifier);
list_for_each_entry(rp, &raw3270_devices, list)
notifier->create(rp->minor);
mutex_unlock(&raw3270_mutex);
return 0;
}
void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
{
struct raw3270 *rp;
mutex_lock(&raw3270_mutex);
list_for_each_entry(rp, &raw3270_devices, list)
notifier->destroy(rp->minor);
list_del(&notifier->list);
mutex_unlock(&raw3270_mutex);
}
/*
* Set 3270 device online.
*/
static int raw3270_set_online(struct ccw_device *cdev)
{
struct raw3270_notifier *np;
struct raw3270 *rp;
int rc;
rp = raw3270_create_device(cdev);
if (IS_ERR(rp))
return PTR_ERR(rp);
rc = raw3270_create_attributes(rp);
if (rc)
goto failure;
raw3270_reset_device(rp);
mutex_lock(&raw3270_mutex);
list_for_each_entry(np, &raw3270_notifier, list)
np->create(rp->minor);
mutex_unlock(&raw3270_mutex);
return 0;
failure:
raw3270_delete_device(rp);
return rc;
}
/*
* Remove 3270 device structure.
*/
static void raw3270_remove(struct ccw_device *cdev)
{
unsigned long flags;
struct raw3270 *rp;
struct raw3270_view *v;
struct raw3270_notifier *np;
rp = dev_get_drvdata(&cdev->dev);
/*
* _remove is the opposite of _probe; it's probe that
* should set up rp. raw3270_remove gets entered for
* devices even if they haven't been varied online.
* Thus, rp may validly be NULL here.
*/
if (!rp)
return;
sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
/* Deactivate current view and remove all views. */
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
if (rp->view) {
if (rp->view->fn->deactivate)
rp->view->fn->deactivate(rp->view);
rp->view = NULL;
}
while (!list_empty(&rp->view_list)) {
v = list_entry(rp->view_list.next, struct raw3270_view, list);
if (v->fn->release)
v->fn->release(v);
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
raw3270_del_view(v);
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
}
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
mutex_lock(&raw3270_mutex);
list_for_each_entry(np, &raw3270_notifier, list)
np->destroy(rp->minor);
mutex_unlock(&raw3270_mutex);
/* Reset 3270 device. */
raw3270_reset_device(rp);
/* And finally remove it. */
raw3270_delete_device(rp);
}
/*
* Set 3270 device offline.
*/
static int raw3270_set_offline(struct ccw_device *cdev)
{
struct raw3270 *rp;
rp = dev_get_drvdata(&cdev->dev);
if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
return -EBUSY;
raw3270_remove(cdev);
return 0;
}
static struct ccw_device_id raw3270_id[] = {
{ CCW_DEVICE(0x3270, 0) },
{ CCW_DEVICE(0x3271, 0) },
{ CCW_DEVICE(0x3272, 0) },
{ CCW_DEVICE(0x3273, 0) },
{ CCW_DEVICE(0x3274, 0) },
{ CCW_DEVICE(0x3275, 0) },
{ CCW_DEVICE(0x3276, 0) },
{ CCW_DEVICE(0x3277, 0) },
{ CCW_DEVICE(0x3278, 0) },
{ CCW_DEVICE(0x3279, 0) },
{ CCW_DEVICE(0x3174, 0) },
{ /* end of list */ },
};
static struct ccw_driver raw3270_ccw_driver = {
.driver = {
.name = "3270",
.owner = THIS_MODULE,
},
.ids = raw3270_id,
.probe = &raw3270_probe,
.remove = &raw3270_remove,
.set_online = &raw3270_set_online,
.set_offline = &raw3270_set_offline,
.int_class = IRQIO_C70,
};
static int raw3270_init(void)
{
struct raw3270 *rp;
int rc;
if (raw3270_registered)
return 0;
raw3270_registered = 1;
rc = ccw_driver_register(&raw3270_ccw_driver);
if (rc == 0) {
/* Create attributes for early (= console) device. */
mutex_lock(&raw3270_mutex);
class3270 = class_create("3270");
list_for_each_entry(rp, &raw3270_devices, list) {
get_device(&rp->cdev->dev);
raw3270_create_attributes(rp);
}
mutex_unlock(&raw3270_mutex);
}
return rc;
}
static void raw3270_exit(void)
{
ccw_driver_unregister(&raw3270_ccw_driver);
class_destroy(class3270);
}
MODULE_LICENSE("GPL");
module_init(raw3270_init);
module_exit(raw3270_exit);
EXPORT_SYMBOL(class3270);
EXPORT_SYMBOL(raw3270_request_alloc);
EXPORT_SYMBOL(raw3270_request_free);
EXPORT_SYMBOL(raw3270_request_reset);
EXPORT_SYMBOL(raw3270_request_set_cmd);
EXPORT_SYMBOL(raw3270_request_add_data);
EXPORT_SYMBOL(raw3270_request_set_data);
EXPORT_SYMBOL(raw3270_request_set_idal);
EXPORT_SYMBOL(raw3270_buffer_address);
EXPORT_SYMBOL(raw3270_add_view);
EXPORT_SYMBOL(raw3270_del_view);
EXPORT_SYMBOL(raw3270_find_view);
EXPORT_SYMBOL(raw3270_activate_view);
EXPORT_SYMBOL(raw3270_deactivate_view);
EXPORT_SYMBOL(raw3270_start);
EXPORT_SYMBOL(raw3270_start_locked);
EXPORT_SYMBOL(raw3270_start_irq);
EXPORT_SYMBOL(raw3270_reset);
EXPORT_SYMBOL(raw3270_register_notifier);
EXPORT_SYMBOL(raw3270_unregister_notifier);
EXPORT_SYMBOL(raw3270_wait_queue);
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