adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-27 19:26:25 +00:00
Code Issues Projects Releases Packages Wiki Activity

display7seg: Convert to pure OF device driver.

Browse source 
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-08-29 18:01:58 -07:00
parent 0e52fe8c01
commit 95d4390579
1 changed files with 144 additions and 103 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

247
drivers/sbus/char/display7seg.c
View file

@ -1,10 +1,7 @@
/* $Id: display7seg.c,v 1.6 2002/01/08 16:00:16 davem Exp $
*
* display7seg - Driver implementation for the 7-segment display
* present on Sun Microsystems CP1400 and CP1500
/* display7seg.c - Driver implementation for the 7-segment display
* present on Sun Microsystems CP1400 and CP1500
*
* Copyright (c) 2000 Eric Brower (ebrower@usa.net)
*
*/
#include <linux/kernel.h>
@ -16,22 +13,20 @@
#include <linux/miscdevice.h>
#include <linux/ioport.h> /* request_region */
#include <linux/smp_lock.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/atomic.h>
#include <asm/ebus.h> /* EBus device */
#include <asm/oplib.h> /* OpenProm Library */
#include <asm/uaccess.h> /* put_/get_user */
#include <asm/io.h>
#include <asm/display7seg.h>
#define D7S_MINOR 193
#define D7S_OBPNAME "display7seg"
#define D7S_DEVNAME "d7s"
#define DRIVER_NAME "d7s"
#define PFX DRIVER_NAME ": "
static int sol_compat = 0; /* Solaris compatibility mode */
#ifdef MODULE
/* Solaris compatibility flag -
* The Solaris implementation omits support for several
* documented driver features (ref Sun doc 806-0180-03).
@ -46,20 +41,20 @@ static int sol_compat = 0; /* Solaris compatibility mode */
* If you wish the device to operate as under Solaris,
* omitting above features, set this parameter to non-zero.
*/
module_param
(sol_compat, int, 0);
MODULE_PARM_DESC
(sol_compat,
"Disables documented functionality omitted from Solaris driver");
module_param(sol_compat, int, 0);
MODULE_PARM_DESC(sol_compat,
"Disables documented functionality omitted from Solaris driver");
MODULE_AUTHOR
("Eric Brower <ebrower@usa.net>");
MODULE_DESCRIPTION
("7-Segment Display driver for Sun Microsystems CP1400/1500");
MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
MODULE_DESCRIPTION("7-Segment Display driver for Sun Microsystems CP1400/1500");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE
("d7s");
#endif /* ifdef MODULE */
MODULE_SUPPORTED_DEVICE("d7s");
struct d7s {
void __iomem *regs;
bool flipped;
};
struct d7s *d7s_device;
/*
* Register block address- see header for details
@ -72,22 +67,6 @@ MODULE_SUPPORTED_DEVICE
* FLIP - Inverts display for upside-down mounted board
* bits 0-4 - 7-segment display contents
*/
static void __iomem* d7s_regs;
static inline void d7s_free(void)
{
iounmap(d7s_regs);
}
static inline int d7s_obpflipped(void)
{
int opt_node;
opt_node = prom_getchild(prom_root_node);
opt_node = prom_searchsiblings(opt_node, "options");
return ((-1 != prom_getintdefault(opt_node, "d7s-flipped?", -1)) ? 0 : 1);
}
static atomic_t d7s_users = ATOMIC_INIT(0);
static int d7s_open(struct inode *inode, struct file *f)
@ -106,12 +85,15 @@ static int d7s_release(struct inode *inode, struct file *f)
* are not operating in solaris-compat mode
*/
if (atomic_dec_and_test(&d7s_users) && !sol_compat) {
int regval = 0;
struct d7s *p = d7s_device;
u8 regval = 0;
regval = readb(d7s_regs);
(0 == d7s_obpflipped()) ?
writeb(regval |= D7S_FLIP, d7s_regs):
writeb(regval &= ~D7S_FLIP, d7s_regs);
regval = readb(p->regs);
if (p->flipped)
regval |= D7S_FLIP;
else
regval &= ~D7S_FLIP;
writeb(regval, p->regs);
}
return 0;
@ -119,9 +101,10 @@ static int d7s_release(struct inode *inode, struct file *f)
static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
__u8 regs = readb(d7s_regs);
__u8 ireg = 0;
struct d7s *p = d7s_device;
u8 regs = readb(p->regs);
int error = 0;
u8 ireg = 0;
if (D7S_MINOR != iminor(file->f_path.dentry->d_inode))
return -ENODEV;
@ -129,18 +112,20 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
lock_kernel();
switch (cmd) {
case D7SIOCWR:
/* assign device register values
* we mask-out D7S_FLIP if in sol_compat mode
/* assign device register values we mask-out D7S_FLIP
* if in sol_compat mode
*/
if (get_user(ireg, (int __user *) arg)) {
error = -EFAULT;
break;
}
if (0 != sol_compat) {
(regs & D7S_FLIP) ?
(ireg |= D7S_FLIP) : (ireg &= ~D7S_FLIP);
if (sol_compat) {
if (regs & D7S_FLIP)
ireg |= D7S_FLIP;
else
ireg &= ~D7S_FLIP;
}
writeb(ireg, d7s_regs);
writeb(ireg, p->regs);
break;
case D7SIOCRD:
@ -158,9 +143,11 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case D7SIOCTM:
/* toggle device mode-- flip display orientation */
(regs & D7S_FLIP) ?
(regs &= ~D7S_FLIP) : (regs |= D7S_FLIP);
writeb(regs, d7s_regs);
if (regs & D7S_FLIP)
regs &= ~D7S_FLIP;
else
regs |= D7S_FLIP;
writeb(regs, p->regs);
break;
};
unlock_kernel();
@ -176,69 +163,123 @@ static const struct file_operations d7s_fops = {
.release = d7s_release,
};
static struct miscdevice d7s_miscdev = { D7S_MINOR, D7S_DEVNAME, &d7s_fops };
static struct miscdevice d7s_miscdev = {
.minor = D7S_MINOR,
.name = DRIVER_NAME,
.fops = &d7s_fops
};
static int __init d7s_init(void)
static int __devinit d7s_probe(struct of_device *op,
const struct of_device_id *match)
{
struct linux_ebus *ebus = NULL;
struct linux_ebus_device *edev = NULL;
int iTmp = 0, regs = 0;
struct device_node *opts;
int err = -EINVAL;
struct d7s *p;
u8 regs;
for_each_ebus(ebus) {
for_each_ebusdev(edev, ebus) {
if (!strcmp(edev->prom_node->name, D7S_OBPNAME))
goto ebus_done;
}
if (d7s_device)
goto out;
p = kzalloc(sizeof(*p), GFP_KERNEL);
err = -ENOMEM;
if (!p)
goto out;
p->regs = of_ioremap(&op->resource[0], 0, sizeof(u8), "d7s");
if (!p->regs) {
printk(KERN_ERR PFX "Cannot map chip registers\n");
goto out_free;
}
ebus_done:
if(!edev) {
printk("%s: unable to locate device\n", D7S_DEVNAME);
return -ENODEV;
err = misc_register(&d7s_miscdev);
if (err) {
printk(KERN_ERR PFX "Unable to acquire miscdevice minor %i\n",
D7S_MINOR);
goto out_iounmap;
}
d7s_regs = ioremap(edev->resource[0].start, sizeof(__u8));
iTmp = misc_register(&d7s_miscdev);
if (0 != iTmp) {
printk("%s: unable to acquire miscdevice minor %i\n",
D7S_DEVNAME, D7S_MINOR);
iounmap(d7s_regs);
return iTmp;
}
/* OBP option "d7s-flipped?" is honored as default
* for the device, and reset default when detached
/* OBP option "d7s-flipped?" is honored as default for the
* device, and reset default when detached
*/
regs = readb(d7s_regs);
iTmp = d7s_obpflipped();
(0 == iTmp) ?
writeb(regs |= D7S_FLIP, d7s_regs):
writeb(regs &= ~D7S_FLIP, d7s_regs);
regs = readb(p->regs);
opts = of_find_node_by_path("/options");
if (opts &&
of_get_property(opts, "d7s-flipped?", NULL))
p->flipped = true;
printk("%s: 7-Segment Display%s at 0x%lx %s\n",
D7S_DEVNAME,
(0 == iTmp) ? (" (FLIPPED)") : (""),
edev->resource[0].start,
(0 != sol_compat) ? ("in sol_compat mode") : (""));
if (p->flipped)
regs |= D7S_FLIP;
else
regs &= ~D7S_FLIP;
writeb(regs, p->regs);
printk(KERN_INFO PFX "7-Segment Display%s at [%s:0x%lx] %s\n",
op->node->full_name,
(regs & D7S_FLIP) ? " (FLIPPED)" : "",
op->resource[0].start,
sol_compat ? "in sol_compat mode" : "");
dev_set_drvdata(&op->dev, p);
d7s_device = p;
err = 0;
out:
return err;
out_iounmap:
of_iounmap(&op->resource[0], p->regs, sizeof(u8));
out_free:
kfree(p);
goto out;
}
static int __devexit d7s_remove(struct of_device *op)
{
struct d7s *p = dev_get_drvdata(&op->dev);
u8 regs = readb(p->regs);
/* Honor OBP d7s-flipped? unless operating in solaris-compat mode */
if (sol_compat) {
if (p->flipped)
regs |= D7S_FLIP;
else
regs &= ~D7S_FLIP;
writeb(regs, p->regs);
}
misc_deregister(&d7s_miscdev);
of_iounmap(&op->resource[0], p->regs, sizeof(u8));
kfree(p);
return 0;
}
static void __exit d7s_cleanup(void)
static struct of_device_id d7s_match[] = {
{
.name = "display7seg",
},
{},
};
MODULE_DEVICE_TABLE(of, d7s_match);
static struct of_platform_driver d7s_driver = {
.name = DRIVER_NAME,
.match_table = d7s_match,
.probe = d7s_probe,
.remove = __devexit_p(d7s_remove),
};
static int __init d7s_init(void)
{
int regs = readb(d7s_regs);
return of_register_driver(&d7s_driver, &of_bus_type);
}
/* Honor OBP d7s-flipped? unless operating in solaris-compat mode */
if (0 == sol_compat) {
(0 == d7s_obpflipped()) ?
writeb(regs |= D7S_FLIP, d7s_regs):
writeb(regs &= ~D7S_FLIP, d7s_regs);
}
misc_deregister(&d7s_miscdev);
d7s_free();
static void __exit d7s_exit(void)
{
of_unregister_driver(&d7s_driver);
}
module_init(d7s_init);
module_exit(d7s_cleanup);
module_exit(d7s_exit);