1 /**
2 nsc_gpio.c
3
4 National Semiconductor GPIO common access methods.
5
6 struct nsc_gpio_ops abstracts the low-level access
7 operations for the GPIO units on 2 NSC chip families; the GEODE
8 integrated CPU, and the PC-8736[03456] integrated PC-peripheral
9 chips.
10
11 The GPIO units on these chips have the same pin architecture, but
12 the access methods differ. Thus, scx200_gpio and pc8736x_gpio
13 implement their own versions of these routines; and use the common
14 file-operations routines implemented in nsc_gpio module.
15
16 Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
17
18 NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
19 NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
20 */
21
22 struct nsc_gpio_ops {
23 struct module* owner;
24 u32 (*gpio_config) (unsigned iminor, u32 mask, u32 bits);
25 void (*gpio_dump) (struct nsc_gpio_ops *amp, unsigned iminor);
26 int (*gpio_get) (unsigned iminor);
27 void (*gpio_set) (unsigned iminor, int state);
28 void (*gpio_change) (unsigned iminor);
29 int (*gpio_current) (unsigned iminor);
30 struct device* dev; /* for dev_dbg() support, set in init */
31 };
32
33 extern ssize_t nsc_gpio_write(struct file *file, const char __user *data,
34 size_t len, loff_t *ppos);
35
36 extern ssize_t nsc_gpio_read(struct file *file, char __user *buf,
37 size_t len, loff_t *ppos);
38
39 extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
40
41
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