This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / char / nsc_gpio.c

diff --git a/drivers/char/nsc_gpio.c b/drivers/char/nsc_gpio.c
new file mode 100644 (file)
index 0000000..4d47d79
--- /dev/null
+++ b/drivers/char/nsc_gpio.c
@@ -0,0 +1,139 @@
+/* linux/drivers/char/nsc_gpio.c
+
+   National Semiconductor common GPIO device-file/VFS methods.
+   Allows a user space process to control the GPIO pins.
+
+   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
+   Copyright (c) 2005      Jim Cromie <jim.cromie@gmail.com>
+*/
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/nsc_gpio.h>
+#include <linux/platform_device.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define NAME "nsc_gpio"
+
+void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index)
+{
+       /* retrieve current config w/o changing it */
+       u32 config = amp->gpio_config(index, ~0, 0);
+
+       /* user requested via 'v' command, so its INFO */
+       dev_info(amp->dev, "io%02u: 0x%04x %s %s %s %s %s %s %s\tio:%d/%d\n",
+                index, config,
+                (config & 1) ? "OE" : "TS",      /* output-enabled/tristate */
+                (config & 2) ? "PP" : "OD",      /* push pull / open drain */
+                (config & 4) ? "PUE" : "PUD",    /* pull up enabled/disabled */
+                (config & 8) ? "LOCKED" : "",    /* locked / unlocked */
+                (config & 16) ? "LEVEL" : "EDGE",/* level/edge input */
+                (config & 32) ? "HI" : "LO",     /* trigger on rise/fall edge */
+                (config & 64) ? "DEBOUNCE" : "", /* debounce */
+
+                amp->gpio_get(index), amp->gpio_current(index));
+}
+
+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;
+       struct device *dev = amp->dev;
+       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':
+                       dev_dbg(dev, "GPIO%d output enabled\n", m);
+                       amp->gpio_config(m, ~1, 1);
+                       break;
+               case 'o':
+                       dev_dbg(dev, "GPIO%d output disabled\n", m);
+                       amp->gpio_config(m, ~1, 0);
+                       break;
+               case 'T':
+                       dev_dbg(dev, "GPIO%d output is push pull\n", m);
+                       amp->gpio_config(m, ~2, 2);
+                       break;
+               case 't':
+                       dev_dbg(dev, "GPIO%d output is open drain\n", m);
+                       amp->gpio_config(m, ~2, 0);
+                       break;
+               case 'P':
+                       dev_dbg(dev, "GPIO%d pull up enabled\n", m);
+                       amp->gpio_config(m, ~4, 4);
+                       break;
+               case 'p':
+                       dev_dbg(dev, "GPIO%d pull up disabled\n", m);
+                       amp->gpio_config(m, ~4, 0);
+                       break;
+               case 'v':
+                       /* View Current pin settings */
+                       amp->gpio_dump(amp, m);
+                       break;
+               case '\n':
+                       /* end of settings string, do nothing */
+                       break;
+               default:
+                       dev_err(dev, "io%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 file-ops routines for both scx200_gpio and pc87360_gpio */
+EXPORT_SYMBOL(nsc_gpio_write);
+EXPORT_SYMBOL(nsc_gpio_read);
+EXPORT_SYMBOL(nsc_gpio_dump);
+
+static int __init nsc_gpio_init(void)
+{
+       printk(KERN_DEBUG NAME " initializing\n");
+       return 0;
+}
+
+static void __exit nsc_gpio_cleanup(void)
+{
+       printk(KERN_DEBUG NAME " cleanup\n");
+}
+
+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");