42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/**
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nsc_gpio.c
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National Semiconductor GPIO common access methods.
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struct nsc_gpio_ops abstracts the low-level access
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operations for the GPIO units on 2 NSC chip families; the GEODE
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integrated CPU, and the PC-8736[03456] integrated PC-peripheral
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chips.
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The GPIO units on these chips have the same pin architecture, but
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the access methods differ. Thus, scx200_gpio and pc8736x_gpio
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implement their own versions of these routines; and use the common
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file-operations routines implemented in nsc_gpio module.
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Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
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NB: this work was tested on the Geode SC-1100 and PC-87366 chips.
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NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond.
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*/
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struct nsc_gpio_ops {
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struct module* owner;
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u32 (*gpio_config) (unsigned iminor, u32 mask, u32 bits);
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void (*gpio_dump) (struct nsc_gpio_ops *amp, unsigned iminor);
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int (*gpio_get) (unsigned iminor);
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void (*gpio_set) (unsigned iminor, int state);
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void (*gpio_change) (unsigned iminor);
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int (*gpio_current) (unsigned iminor);
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struct device* dev; /* for dev_dbg() support, set in init */
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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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extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index);
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