Home | History | Annotate | Line # | Download | only in ic
mcp23xxxgpiovar.h revision 1.2 
      1 /*      $NetBSD: mcp23xxxgpiovar.h,v 1.2 2022/01/17 19:36:54 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014, 2022 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Frank Kardel, and by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _DEV_IC_MCP23xxxGPIOVAR_H_
     33 #define	_DEV_IC_MCP23xxxGPIOVAR_H_
     34 
     35 /*
     36  * Driver for Microchip serial I/O expansers:
     37  *
     38  *	MCP23008	8-bit, I2C interface
     39  *	MCP23S08	8-bit, SPI interface
     40  *	MCP23017	16-bit, I2C interface
     41  *	MCP23S17	16-bit, SPI interface
     42  *	MCP23018	16-bit (open-drain outputs), I2C interface
     43  *	MCP23S18	16-bit (open-drain outputs), SPI interface
     44  *
     45  * Data sheet:
     46  *
     47  *	https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
     48  */
     49 
     50 #include <sys/gpio.h>
     51 #include <dev/gpio/gpiovar.h>
     52 
     53 struct mcpgpio_softc;
     54 
     55 typedef enum {
     56 	MCPGPIO_TYPE_23x08	= 0,
     57 	MCPGPIO_TYPE_23x17	= 1,
     58 	MCPGPIO_TYPE_23x18	= 2,
     59 } mcpgpio_type;
     60 
     61 struct mcpgpio_variant {
     62 	const char		*name;
     63 	mcpgpio_type		type;
     64 };
     65 
     66 struct mcpgpio_accessops {
     67 	int			(*lock)(struct mcpgpio_softc *);
     68 	void			(*unlock)(struct mcpgpio_softc *);
     69 	int			(*read)(struct mcpgpio_softc *,
     70 				    unsigned int, uint8_t, uint8_t *);
     71 	int			(*write)(struct mcpgpio_softc *,
     72 				    unsigned int, uint8_t, uint8_t);
     73 };
     74 
     75 struct mcpgpio_softc {
     76 	device_t                sc_dev;
     77 	const struct mcpgpio_variant *sc_variant;
     78 	struct gpio_chipset_tag	sc_gpio_gc;
     79 	gpio_pin_t		*sc_gpio_pins;
     80 	unsigned int		sc_npins;
     81 	uint8_t			sc_iocon; /* I/O configuration */
     82 
     83 	/* Bus-specific access functions. */
     84 	const struct mcpgpio_accessops *sc_accessops;
     85 };
     86 
     87 void	mcpgpio_attach(struct mcpgpio_softc *);
     88 
     89 #endif /* _DEV_IC_MCP23xxxGPIOVAR_H_ */
     90