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[PATCH] chardev: GPIO for SCx200 & PC-8736x: migrate file-ops to common module
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> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jim Cromie
Linus Torvalds
parent
1ca5df0a4c
commit
1a66fdf083
@ -19,9 +19,89 @@
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#define NAME "nsc_gpio"
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MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
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MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
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MODULE_LICENSE("GPL");
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ssize_t nsc_gpio_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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unsigned m = iminor(file->f_dentry->d_inode);
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struct nsc_gpio_ops *amp = file->private_data;
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size_t i;
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int err = 0;
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for (i = 0; i < len; ++i) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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switch (c) {
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case '0':
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amp->gpio_set(m, 0);
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break;
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case '1':
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amp->gpio_set(m, 1);
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break;
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case 'O':
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printk(KERN_INFO NAME ": GPIO%d output enabled\n", m);
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amp->gpio_config(m, ~1, 1);
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break;
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case 'o':
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printk(KERN_INFO NAME ": GPIO%d output disabled\n", m);
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amp->gpio_config(m, ~1, 0);
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break;
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case 'T':
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printk(KERN_INFO NAME ": GPIO%d output is push pull\n",
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m);
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amp->gpio_config(m, ~2, 2);
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break;
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case 't':
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printk(KERN_INFO NAME ": GPIO%d output is open drain\n",
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m);
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amp->gpio_config(m, ~2, 0);
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break;
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case 'P':
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printk(KERN_INFO NAME ": GPIO%d pull up enabled\n", m);
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amp->gpio_config(m, ~4, 4);
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break;
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case 'p':
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printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
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amp->gpio_config(m, ~4, 0);
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break;
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case 'v':
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/* View Current pin settings */
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amp->gpio_dump(m);
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break;
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case '\n':
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/* end of settings string, do nothing */
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break;
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default:
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printk(KERN_ERR NAME
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": GPIO-%2d bad setting: chr<0x%2x>\n", m,
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(int)c);
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err++;
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}
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}
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if (err)
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return -EINVAL; /* full string handled, report error */
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return len;
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}
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ssize_t nsc_gpio_read(struct file *file, char __user * buf,
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size_t len, loff_t * ppos)
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{
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unsigned m = iminor(file->f_dentry->d_inode);
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int value;
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struct nsc_gpio_ops *amp = file->private_data;
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value = amp->gpio_get(m);
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if (put_user(value ? '1' : '0', buf))
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return -EFAULT;
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return 1;
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}
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/* common routines for both scx200_gpio and pc87360_gpio */
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EXPORT_SYMBOL(nsc_gpio_write);
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EXPORT_SYMBOL(nsc_gpio_read);
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static int __init nsc_gpio_init(void)
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{
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@ -34,12 +114,9 @@ static void __exit nsc_gpio_cleanup(void)
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printk(KERN_DEBUG NAME " cleanup\n");
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}
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/* prepare for
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common routines for both scx200_gpio and pc87360_gpio
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EXPORT_SYMBOL(scx200_gpio_write);
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EXPORT_SYMBOL(scx200_gpio_read);
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EXPORT_SYMBOL(scx200_gpio_release);
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*/
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module_init(nsc_gpio_init);
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module_exit(nsc_gpio_cleanup);
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MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
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MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
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MODULE_LICENSE("GPL");
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@ -37,6 +37,12 @@ MODULE_PARM_DESC(major, "Major device number");
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extern void scx200_gpio_dump(unsigned index);
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extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos);
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extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos);
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struct nsc_gpio_ops scx200_access = {
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.owner = THIS_MODULE,
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.gpio_config = scx200_gpio_configure,
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@ -49,84 +55,6 @@ struct nsc_gpio_ops scx200_access = {
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.gpio_current = scx200_gpio_current
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};
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static ssize_t scx200_gpio_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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unsigned m = iminor(file->f_dentry->d_inode);
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struct nsc_gpio_ops *amp = file->private_data;
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size_t i;
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int err = 0;
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for (i = 0; i < len; ++i) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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switch (c) {
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case '0':
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amp->gpio_set(m, 0);
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break;
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case '1':
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amp->gpio_set(m, 1);
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break;
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case 'O':
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printk(KERN_INFO NAME ": GPIO%d output enabled\n", m);
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amp->gpio_config(m, ~1, 1);
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break;
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case 'o':
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printk(KERN_INFO NAME ": GPIO%d output disabled\n", m);
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amp->gpio_config(m, ~1, 0);
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break;
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case 'T':
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printk(KERN_INFO NAME ": GPIO%d output is push pull\n", m);
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amp->gpio_config(m, ~2, 2);
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break;
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case 't':
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printk(KERN_INFO NAME ": GPIO%d output is open drain\n", m);
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amp->gpio_config(m, ~2, 0);
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break;
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case 'P':
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printk(KERN_INFO NAME ": GPIO%d pull up enabled\n", m);
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amp->gpio_config(m, ~4, 4);
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break;
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case 'p':
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printk(KERN_INFO NAME ": GPIO%d pull up disabled\n", m);
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amp->gpio_config(m, ~4, 0);
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break;
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case 'v':
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/* View Current pin settings */
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amp->gpio_dump(m);
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break;
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case '\n':
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/* end of settings string, do nothing */
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break;
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default:
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printk(KERN_ERR NAME
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": GPIO-%2d bad setting: chr<0x%2x>\n", m,
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(int)c);
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err++;
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}
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}
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if (err)
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return -EINVAL; /* full string handled, report error */
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return len;
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}
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static ssize_t scx200_gpio_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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unsigned m = iminor(file->f_dentry->d_inode);
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int value;
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struct nsc_gpio_ops *amp = file->private_data;
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value = amp->gpio_get(m);
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if (put_user(value ? '1' : '0', buf))
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return -EFAULT;
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return 1;
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}
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static int scx200_gpio_open(struct inode *inode, struct file *file)
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{
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unsigned m = iminor(inode);
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@ -145,8 +73,8 @@ static int scx200_gpio_release(struct inode *inode, struct file *file)
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static struct file_operations scx200_gpio_fops = {
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.owner = THIS_MODULE,
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.write = scx200_gpio_write,
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.read = scx200_gpio_read,
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.write = nsc_gpio_write,
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.read = nsc_gpio_read,
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.open = scx200_gpio_open,
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.release = scx200_gpio_release,
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};
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@ -31,3 +31,8 @@ struct nsc_gpio_ops {
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int (*gpio_current) (unsigned iminor);
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};
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extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos);
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extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos);
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