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 22struct 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 33extern ssize_t nsc_gpio_write(struct file *file, const char __user *data, 34 size_t len, loff_t *ppos); 35 36extern ssize_t nsc_gpio_read(struct file *file, char __user *buf, 37 size_t len, loff_t *ppos); 38 39extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index); 40 41