| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /** |
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| 3 | nsc_gpio.c |
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| 4 | |
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| 5 | National Semiconductor GPIO common access methods. |
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| 6 | |
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| 7 | struct nsc_gpio_ops abstracts the low-level access |
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| 8 | operations for the GPIO units on 2 NSC chip families; the GEODE |
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| 9 | integrated CPU, and the PC-8736[03456] integrated PC-peripheral |
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| 10 | chips. |
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| 11 | |
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| 12 | The GPIO units on these chips have the same pin architecture, but |
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| 13 | the access methods differ. Thus, scx200_gpio and pc8736x_gpio |
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| 14 | implement their own versions of these routines; and use the common |
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| 15 | file-operations routines implemented in nsc_gpio module. |
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| 16 | |
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| 17 | Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com> |
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| 18 | |
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| 19 | NB: this work was tested on the Geode SC-1100 and PC-87366 chips. |
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| 20 | NSC sold the GEODE line to AMD, and the PC-8736x line to Winbond. |
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| 21 | */ |
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| 22 | |
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| 23 | struct nsc_gpio_ops { |
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| 24 | struct module* owner; |
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| 25 | u32 (*gpio_config) (unsigned iminor, u32 mask, u32 bits); |
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| 26 | void (*gpio_dump) (struct nsc_gpio_ops *amp, unsigned iminor); |
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| 27 | int (*gpio_get) (unsigned iminor); |
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| 28 | void (*gpio_set) (unsigned iminor, int state); |
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| 29 | void (*gpio_change) (unsigned iminor); |
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| 30 | int (*gpio_current) (unsigned iminor); |
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| 31 | struct device* dev; /* for dev_dbg() support, set in init */ |
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| 32 | }; |
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| 33 | |
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| 34 | extern ssize_t nsc_gpio_write(struct file *file, const char __user *data, |
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| 35 | size_t len, loff_t *ppos); |
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| 36 | |
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| 37 | extern ssize_t nsc_gpio_read(struct file *file, char __user *buf, |
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| 38 | size_t len, loff_t *ppos); |
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| 39 | |
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| 40 | extern void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index); |
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| 41 | |
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| 42 | |
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