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      1 /* $NetBSD: ptcd.c,v 1.5 2021/08/07 16:19:12 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2012 Marc Balmer <marc (at) msys.ch>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 /*
     29  * Driver for the Protech PS3100 cash drawer port.
     30  */
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/device.h>
     35 #include <sys/gpio.h>
     36 #include <sys/kernel.h>
     37 #include <sys/bus.h>
     38 
     39 #include <dev/gpio/gpiovar.h>
     40 
     41 #include <dev/isa/isareg.h>
     42 #include <dev/isa/isavar.h>
     43 
     44 /*
     45  * To assert the cash drawer pulse, 0x00 must be written to I/O register 0x48f
     46  * To stop the cash drawer pulse, 0x02 must be written to I/O register 0x48f
     47  * To read out the current cash drawer state (sense pin), read bit 7 of
     48  * I/O register 0x48d
     49  */
     50 
     51 #define PTCD_READ_REG	0x48d
     52 
     53 /* register offsets, counted from PTCD_READ_REG */
     54 #define PTCD_READ	0x00
     55 #define PTCD_WRITE	0x02
     56 
     57 /* Read mask */
     58 #define PTCD_SENSE	0x80
     59 
     60 /* Write values */
     61 #define PTCD_OPEN	0x00
     62 #define PTCD_CLOSE	0x02
     63 
     64 #define PTCD_NPINS	2
     65 #define PIN_WRITE	0
     66 #define	PIN_READ	1
     67 
     68 #define PTCD_ADDR_SIZE	0x03
     69 
     70 struct ptcd_softc {
     71 	bus_space_tag_t sc_iot;
     72 	bus_space_handle_t sc_ioh;
     73 
     74 	/* GPIO interface */
     75 	struct gpio_chipset_tag	sc_gpio_gc;
     76 	gpio_pin_t		sc_gpio_pins[PTCD_NPINS];
     77 };
     78 
     79 int ptcd_match(device_t, struct cfdata *, void *);
     80 void ptcd_attach(device_t, device_t, void *);
     81 
     82 int	ptcd_gpio_pin_read(void *, int);
     83 void	ptcd_gpio_pin_write(void *, int, int);
     84 void	ptcd_gpio_pin_ctl(void *, int, int);
     85 
     86 CFATTACH_DECL2_NEW(ptcd, sizeof(struct ptcd_softc), ptcd_match, ptcd_attach,
     87     NULL, NULL, NULL, NULL);
     88 
     89 int
     90 ptcd_match(device_t parent, struct cfdata *match, void *aux)
     91 {
     92 	struct isa_attach_args *ia = aux;
     93 
     94 	if (ia->ia_nio < 1)
     95 		return 0;
     96 
     97 	if (ISA_DIRECT_CONFIG(ia))
     98 		return 0;
     99 
    100 	if (ia->ia_io[0].ir_addr != PTCD_READ_REG)
    101 		return 0;
    102 
    103 	ia->ia_io[0].ir_size = PTCD_ADDR_SIZE;
    104 	ia->ia_niomem = 0;
    105 	ia->ia_nirq = 0;
    106 	ia->ia_ndrq = 0;
    107 
    108 	return 1;
    109 }
    110 
    111 void
    112 ptcd_attach(device_t parent, device_t self, void *aux)
    113 {
    114 	struct ptcd_softc *sc;
    115 	struct isa_attach_args *ia = aux;
    116 	struct gpiobus_attach_args gba;
    117 
    118 	sc = device_private(self);
    119 
    120 	sc->sc_iot = ia->ia_iot;
    121 	if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, PTCD_ADDR_SIZE, 0,
    122 	    &sc->sc_ioh)) {
    123 		aprint_error(": can't map i/o space\n");
    124 		return;
    125 	}
    126 
    127 	aprint_normal(": Protech PS3100 cash drawer\n");
    128 
    129 	/* Initialize pins array */
    130 	sc->sc_gpio_pins[PIN_WRITE].pin_num = 0;
    131 	sc->sc_gpio_pins[PIN_WRITE].pin_caps = GPIO_PIN_OUTPUT;
    132 	sc->sc_gpio_pins[PIN_READ].pin_num = 1;
    133 	sc->sc_gpio_pins[PIN_READ].pin_caps = GPIO_PIN_INPUT;
    134 
    135 	/* Create controller tag */
    136 	sc->sc_gpio_gc.gp_cookie = sc;
    137 	sc->sc_gpio_gc.gp_pin_read = ptcd_gpio_pin_read;
    138 	sc->sc_gpio_gc.gp_pin_write = ptcd_gpio_pin_write;
    139 	sc->sc_gpio_gc.gp_pin_ctl = ptcd_gpio_pin_ctl;
    140 
    141 	gba.gba_gc = &sc->sc_gpio_gc;
    142 	gba.gba_pins = sc->sc_gpio_pins;
    143 	gba.gba_npins = PTCD_NPINS;
    144 
    145 	/* Attach GPIO framework */
    146 	config_found(self, &gba, gpiobus_print, CFARGS_NONE);
    147 }
    148 
    149 int
    150 ptcd_gpio_pin_read(void *arg, int pin)
    151 {
    152 	struct ptcd_softc *sc = arg;
    153 	uint8_t data;
    154 
    155 	if (pin != PIN_READ)
    156 		return 0;
    157 
    158 	data = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PTCD_READ);
    159 	return data & PTCD_SENSE ? 0 : 1;
    160 }
    161 
    162 void
    163 ptcd_gpio_pin_write(void *arg, int pin, int value)
    164 {
    165 	struct ptcd_softc *sc = arg;
    166 
    167 	if (pin != PIN_WRITE)
    168 		return;
    169 
    170 	bus_space_write_1(sc->sc_iot, sc->sc_ioh, PTCD_WRITE,
    171 	    value ? PTCD_OPEN : PTCD_CLOSE);
    172 }
    173 
    174 void
    175 ptcd_gpio_pin_ctl(void *arg, int pin, int flags)
    176 {
    177 	/* We ignore pin control requests since the pin functions are fixed. */
    178 }
    179