gpio-max730x.c File Reference

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/spi/max7301.h>
#include <linux/gpio.h>
#include <linux/slab.h>

Go to the source code of this file.

Macros
#define	PIN_CONFIG_MASK   0x03
#define	PIN_CONFIG_IN_PULLUP   0x03
#define	PIN_CONFIG_IN_WO_PULLUP   0x02
#define	PIN_CONFIG_OUT   0x01
#define	PIN_NUMBER   28

Functions
int __devinit	__max730x_probe (struct max7301 *ts)
	EXPORT_SYMBOL_GPL (__max730x_probe)
int __devexit	__max730x_remove (struct device *dev)
	EXPORT_SYMBOL_GPL (__max730x_remove)
	MODULE_AUTHOR ("Juergen Beisert, Wolfram Sang")
	MODULE_LICENSE ("GPL v2")
	MODULE_DESCRIPTION ("MAX730x GPIO-Expanders, generic parts")

Macro Definition Documentation

#define PIN_CONFIG_IN_PULLUP   0x03

Definition at line 45 of file gpio-max730x.c.

#define PIN_CONFIG_IN_WO_PULLUP   0x02

Definition at line 46 of file gpio-max730x.c.

#define PIN_CONFIG_MASK   0x03

Copyright (C) 2006 Juergen Beisert, Pengutronix Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix Copyright (C) 2009 Wolfram Sang, Pengutronix

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

The Maxim MAX7300/1 device is an I2C/SPI driven GPIO expander. There are 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more details Note:

• DIN must be stable at the rising edge of clock.
• when writing:
  • always clock in 16 clocks at once
  • at DIN: D15 first, D0 last
  • D0..D7 = databyte, D8..D14 = commandbyte
  • D15 = low -> write command
• when reading
  • always clock in 16 clocks at once
  • at DIN: D15 first, D0 last
  • D0..D7 = dummy, D8..D14 = register address
  • D15 = high -> read command
  • raise CS and assert it again
  • always clock in 16 clocks at once
  • at DOUT: D15 first, D0 last
  • D0..D7 contains the data from the first cycle

The driver exports a standard gpiochip interface

Definition at line 44 of file gpio-max730x.c.

#define PIN_CONFIG_OUT   0x01

Definition at line 47 of file gpio-max730x.c.

#define PIN_NUMBER   28

Definition at line 49 of file gpio-max730x.c.

Function Documentation

int __devinit __max730x_probe

(

struct max7301 *

ts

)

Definition at line 163 of file gpio-max730x.c.

int __devexit __max730x_remove

(

struct device *

dev

)

Definition at line 229 of file gpio-max730x.c.

EXPORT_SYMBOL_GPL

(

__max730x_probe

)

EXPORT_SYMBOL_GPL

(

__max730x_remove

)

MODULE_AUTHOR	(	"Juergen	Beisert,
		Wolfram Sang"
	)

MODULE_DESCRIPTION	(	"MAX730x GPIO-	Expanders,
		generic parts"
	)

MODULE_LICENSE

(

"GPL v2"

)