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basic_mmio_gpio: split into a gpio library and platform device

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Allow GPIO_BASIC_MMIO_CORE to be used to provide an accessor library
for implementing GPIO drivers whilst abstracting the register access
detail.  Based on a patch from Anton Vorontsov[1] and adapted to allow
bgpio_chip to be embedded in another structure.

Changes since v1:
	- Register the gpio_chip in the platform device probe

1. https://lkml.org/lkml/2011/4/19/401

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Jamie Iles
2011-05-20 00:40:19 -06:00
committed by Grant Likely
parent e849dc044a
commit 280df6b3c3
4 changed files with 235 additions and 152 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
include/linux/basic_mmio_gpio.h
View File

@@ -13,9 +13,64 @@
#ifndef __BASIC_MMIO_GPIO_H
#define __BASIC_MMIO_GPIO_H
#include <linux/gpio.h>
#include <linux/types.h>
#include <linux/compiler.h>
struct bgpio_pdata {
int base;
int ngpio;
};
struct device;
struct bgpio_chip {
struct gpio_chip gc;
unsigned long (*read_reg)(void __iomem *reg);
void (*write_reg)(void __iomem *reg, unsigned long data);
void __iomem *reg_dat;
void __iomem *reg_set;
void __iomem *reg_clr;
void __iomem *reg_dir;
/* Number of bits (GPIOs): <register width> * 8. */
int bits;
/*
* Some GPIO controllers work with the big-endian bits notation,
* e.g. in a 8-bits register, GPIO7 is the least significant bit.
*/
unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
/*
* Used to lock bgpio_chip->data. Also, this is needed to keep
* shadowed and real data registers writes together.
*/
spinlock_t lock;
/* Shadowed data register to clear/set bits safely. */
unsigned long data;
/* Shadowed direction registers to clear/set direction safely. */
unsigned long dir;
};
static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
{
return container_of(gc, struct bgpio_chip, gc);
}
int __devexit bgpio_remove(struct bgpio_chip *bgc);
int __devinit bgpio_init(struct bgpio_chip *bgc,
struct device *dev,
unsigned long sz,
void __iomem *dat,
void __iomem *set,
void __iomem *clr,
void __iomem *dirout,
void __iomem *dirin,
bool big_endian);
#endif /* __BASIC_MMIO_GPIO_H */