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Subject[patch -mm 11/20] chardev: GPIO for SCx200 & PC-8736x: migrate file-ops to common module
11/20. patch.migrate-fops

Now that the read(), write() file-ops are dispatching gpio-ops via the
vtable, they are generic, and can be moved 'verbatim' to the nsc_gpio
common-support module. After the move, various symbols are renamed to
update 'scx200_' to 'nsc_', and headers are adjusted accordingly.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>

---

diffstat gpio-scx/patch.migrate-fops
drivers/char/nsc_gpio.c | 97 ++++++++++++++++++++++++++++++++++++++++-----
drivers/char/scx200_gpio.c | 88 +++-------------------------------------
include/linux/nsc_gpio.h | 5 ++
3 files changed, 100 insertions(+), 90 deletions(-)

diff -ruNp -X dontdiff -X exclude-diffs ax-10/drivers/char/nsc_gpio.c ax-11/drivers/char/nsc_gpio.c
--- ax-10/drivers/char/nsc_gpio.c 2006-06-17 01:27:04.000000000 -0600
+++ ax-11/drivers/char/nsc_gpio.c 2006-06-17 01:33:50.000000000 -0600
@@ -19,9 +19,89 @@

#define NAME "nsc_gpio"

-MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
-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@gmail.com>");
+MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
+MODULE_LICENSE("GPL");
diff -ruNp -X dontdiff -X exclude-diffs ax-10/drivers/char/scx200_gpio.c ax-11/drivers/char/scx200_gpio.c
--- ax-10/drivers/char/scx200_gpio.c 2006-06-17 01:23:47.000000000 -0600
+++ ax-11/drivers/char/scx200_gpio.c 2006-06-17 01:33:50.000000000 -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,
@@ -49,84 +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);
@@ -145,8 +73,8 @@ 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 ax-10/include/linux/nsc_gpio.h ax-11/include/linux/nsc_gpio.h
--- ax-10/include/linux/nsc_gpio.h 2006-06-17 01:20:34.000000000 -0600
+++ ax-11/include/linux/nsc_gpio.h 2006-06-17 01:33:50.000000000 -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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