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-rw-r--r--include/linux/nsc_gpio.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/nsc_gpio.h b/include/linux/nsc_gpio.h
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+++ b/include/linux/nsc_gpio.h
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+/**
+ nsc_gpio.c
+
+ National Semiconductor GPIO common access methods.
+
+ struct nsc_gpio_ops abstracts the low-level access
+ operations for the GPIO units on 2 NSC chip families; the GEODE
+ integrated CPU, and the PC-8736[03456] integrated PC-peripheral
+ chips.
+
+ The GPIO units on these chips have the same pin architecture, but
+ the access methods differ. Thus, scx200_gpio and pc8736x_gpio
+ implement their own versions of these routines; and use the common
+ file-operations routines implemented in nsc_gpio module.
+
+ Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
+
+ NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
+ NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
+*/
+
+struct nsc_gpio_ops {
+ struct module* owner;
+ u32 (*gpio_config) (unsigned iminor, u32 mask, u32 bits);
+ void (*gpio_dump) (struct nsc_gpio_ops *amp, unsigned iminor);
+ int (*gpio_get) (unsigned iminor);
+ void (*gpio_set) (unsigned iminor, int state);
+ void (*gpio_set_high)(unsigned iminor);
+ void (*gpio_set_low) (unsigned iminor);
+ void (*gpio_change) (unsigned iminor);
+ int (*gpio_current) (unsigned iminor);
+ struct device* dev; /* for dev_dbg() support, set in init */
+};
+
+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);
+
+extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
+