GPIO SUPPORT FOR SCx200 & PC8736x
This patch-set reworks the 2.4 vintage scx200_gpio driver for modern
2.6, and refactors GPIO support to reuse it in a new driver for the
GPIO on PC-8736x chips.
12/19. patch.migrate-fops
Move read(), write() to common-support file: nsc_gpio.c, rename them
for their new home, and change scx200_gpio's vtable too. Since these
handlers are already using the gpio_ops vtable-calls, they move with
just the renames. Fn-decls are added to the header
Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
diffstat patch.migrate-fops
nsc_gpio.c | 97
+++++++++++++++++++++++++++++++++++++++++++++++++++------
scx200_gpio.c | 90 ++++-------------------------------------------------
nsc_gpio.h | 5 +++++
3 files changed, 100 insertions(+), 92 deletions(-)
diff -ruNp -X dontdiff -X exclude-diffs k16r-11/drivers/char/nsc_gpio.c
k16r-12/drivers/char/nsc_gpio.c
--- k16r-11/drivers/char/nsc_gpio.c 2006-05-28 12:21:46.000000000 -0600
+++ k16r-12/drivers/char/nsc_gpio.c 2006-05-28 12:22:06.000000000 -0600
@@ -19,9 +19,89 @@
#define NAME "nsc_gpio"
-MODULE_AUTHOR("Jim Cromie <jim.cromie@xxxxxxxxx>");
-MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
-MODULE_LICENSE("GPL");
+ssize_t nsc_gpio_write(struct file *file, const char __user * data,
+ size_t len, loff_t * ppos)
+{
+ unsigned m = iminor(file->f_dentry->d_inode);
+ struct nsc_gpio_ops *amp = file->private_data;
+ size_t i;
+ int err = 0;
+
+ for (i = 0; i < len; ++i) {
+ char c;
+ if (get_user(c, data + i))
+ return -EFAULT;
+ switch (c) {
+ case '0':
+ amp->gpio_set(m, 0);
+ break;
+ case '1':
+ amp->gpio_set(m, 1);
+ break;
+ case 'O':
+ printk(KERN_INFO NAME ": GPIO%d output enabled\n", m);
+ amp->gpio_config(m, ~1, 1);
+ break;
+ case 'o':
+ printk(KERN_INFO NAME ": GPIO%d output disabled\n", m);
+ amp->gpio_config(m, ~1, 0);
+ break;
+ case 'T':
+ printk(KERN_INFO NAME ": GPIO%d output is push pull\n",
+ m);
+ amp->gpio_config(m, ~2, 2);
+ break;
+ case 't':
+ printk(KERN_INFO NAME ": GPIO%d output is open drain\n",
+ m);
+ amp->gpio_config(m, ~2, 0);
+ break;
+ case 'P':
+ printk(KERN_INFO NAME ": GPIO%d pull up enabled\n", m);
+ amp->gpio_config(m, ~4, 4);
+ break;
+ case 'p':
+ printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
+ amp->gpio_config(m, ~4, 0);
+ break;
+
+ case 'v':
+ /* View Current pin settings */
+ amp->gpio_dump(m);
+ break;
+ case '\n':
+ /* end of settings string, do nothing */
+ break;
+ default:
+ printk(KERN_ERR NAME
+ ": GPIO-%2d bad setting: chr<0x%2x>\n", m,
+ (int)c);
+ err++;
+ }
+ }
+ if (err)
+ return -EINVAL; /* full string handled, report error */
+
+ return len;
+}
+
+ssize_t nsc_gpio_read(struct file *file, char __user * buf,
+ size_t len, loff_t * ppos)
+{
+ unsigned m = iminor(file->f_dentry->d_inode);
+ int value;
+ struct nsc_gpio_ops *amp = file->private_data;
+
+ value = amp->gpio_get(m);
+ if (put_user(value ? '1' : '0', buf))
+ return -EFAULT;
+
+ return 1;
+}
+
+/* common routines for both scx200_gpio and pc87360_gpio */
+EXPORT_SYMBOL(nsc_gpio_write);
+EXPORT_SYMBOL(nsc_gpio_read);
static int __init nsc_gpio_init(void)
{
@@ -34,12 +114,9 @@ static void __exit nsc_gpio_cleanup(void
printk(KERN_DEBUG NAME " cleanup\n");
}
-/* prepare for
- common routines for both scx200_gpio and pc87360_gpio
-EXPORT_SYMBOL(scx200_gpio_write);
-EXPORT_SYMBOL(scx200_gpio_read);
-EXPORT_SYMBOL(scx200_gpio_release);
-*/
-
module_init(nsc_gpio_init);
module_exit(nsc_gpio_cleanup);
+
+MODULE_AUTHOR("Jim Cromie <jim.cromie@xxxxxxxxx>");
+MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
+MODULE_LICENSE("GPL");
diff -ruNp -X dontdiff -X exclude-diffs k16r-11/drivers/char/scx200_gpio.c
k16r-12/drivers/char/scx200_gpio.c
--- k16r-11/drivers/char/scx200_gpio.c 2006-05-28 12:21:35.000000000 -0600
+++ k16r-12/drivers/char/scx200_gpio.c 2006-05-28 12:22:07.000000000 -0600
@@ -37,6 +37,12 @@ MODULE_PARM_DESC(major, "Major device nu
extern void scx200_gpio_dump(unsigned index);
+extern ssize_t nsc_gpio_write(struct file *file, const char __user * data,
+ size_t len, loff_t * ppos);
+
+extern ssize_t nsc_gpio_read(struct file * file, char __user * buf,
+ size_t len, loff_t * ppos);
+
struct nsc_gpio_ops scx200_access = {
.owner = THIS_MODULE,
.gpio_config = scx200_gpio_configure,
@@ -49,86 +55,6 @@ struct nsc_gpio_ops scx200_access
.gpio_current = scx200_gpio_current
};
-static ssize_t scx200_gpio_write(struct file *file, const char __user * data,
- size_t len, loff_t * ppos)
-{
- unsigned m = iminor(file->f_dentry->d_inode);
- struct nsc_gpio_ops *amp = file->private_data;
- size_t i;
- int err = 0;
-
- for (i = 0; i < len; ++i) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- switch (c) {
- case '0':
- amp->gpio_set(m, 0);
- break;
- case '1':
- amp->gpio_set(m, 1);
- break;
- case 'O':
- printk(KERN_INFO NAME ": GPIO%d output enabled\n", m);
- amp->gpio_config(m, ~1, 1);
- break;
- case 'o':
- printk(KERN_INFO NAME ": GPIO%d output disabled\n", m);
- amp->gpio_config(m, ~1, 0);
- break;
- case 'T':
- printk(KERN_INFO NAME ": GPIO%d output is push pull\n",
- m);
- amp->gpio_config(m, ~2, 2);
- break;
- case 't':
- printk(KERN_INFO NAME ": GPIO%d output is open drain\n",
- m);
- amp->gpio_config(m, ~2, 0);
- break;
- case 'P':
- printk(KERN_INFO NAME ": GPIO%d pull up enabled\n", m);
- amp->gpio_config(m, ~4, 4);
- break;
- case 'p':
- printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
- amp->gpio_config(m, ~4, 0);
- break;
-
- case 'v':
- /* View Current pin settings */
- amp->gpio_dump(m);
- break;
- case '\n':
- /* end of settings string, do nothing */
- break;
- default:
- printk(KERN_ERR NAME
- ": GPIO-%2d bad setting: chr<0x%2x>\n", m,
- (int)c);
- err++;
- }
- }
- if (err)
- return -EINVAL; /* full string handled, report error */
-
- return len;
-}
-
-static ssize_t scx200_gpio_read(struct file *file, char __user * buf,
- size_t len, loff_t * ppos)
-{
- unsigned m = iminor(file->f_dentry->d_inode);
- int value;
- struct nsc_gpio_ops *amp = file->private_data;
-
- value = amp->gpio_get(m);
- if (put_user(value ? '1' : '0', buf))
- return -EFAULT;
-
- return 1;
-}
-
static int scx200_gpio_open(struct inode *inode, struct file *file)
{
unsigned m = iminor(inode);
@@ -146,8 +72,8 @@ static int scx200_gpio_release(struct in
static struct file_operations scx200_gpio_fops = {
.owner = THIS_MODULE,
- .write = scx200_gpio_write,
- .read = scx200_gpio_read,
+ .write = nsc_gpio_write,
+ .read = nsc_gpio_read,
.open = scx200_gpio_open,
.release = scx200_gpio_release,
};
diff -ruNp -X dontdiff -X exclude-diffs k16r-12/include/linux/nsc_gpio.h
k16r-13/include/linux/nsc_gpio.h
--- k16r-12/include/linux/nsc_gpio.h 2006-05-28 12:21:21.000000000 -0600
+++ k16r-13/include/linux/nsc_gpio.h 2006-05-28 12:22:21.000000000 -0600
@@ -31,3 +31,8 @@ struct nsc_gpio_ops {
int (*gpio_current) (unsigned iminor);
};
+extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos);
+
+extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos);
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