Annotation of sys/dev/i2c/pca9554.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: pca9554.c,v 1.14 2007/07/31 21:34:39 cnst Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2005 Theo de Raadt
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #include <sys/param.h>
! 20: #include <sys/systm.h>
! 21: #include <sys/device.h>
! 22: #include <sys/gpio.h>
! 23: #include <sys/sensors.h>
! 24:
! 25: #include <dev/i2c/i2cvar.h>
! 26:
! 27: #include <dev/gpio/gpiovar.h>
! 28:
! 29: /* Phillips 9554 registers */
! 30: #define PCA9554_IN 0x00
! 31: #define PCA9554_OUT 0x01
! 32: #define PCA9554_POLARITY 0x02
! 33: #define PCA9554_CONFIG 0x03
! 34:
! 35: /* Sensors */
! 36: #define PCAGPIO_NPINS 8
! 37:
! 38: struct pcagpio_softc {
! 39: struct device sc_dev;
! 40: i2c_tag_t sc_tag;
! 41: i2c_addr_t sc_addr;
! 42: u_int8_t sc_control;
! 43: u_int8_t sc_polarity;
! 44:
! 45: struct gpio_chipset_tag sc_gpio_gc;
! 46: gpio_pin_t sc_gpio_pins[PCAGPIO_NPINS];
! 47:
! 48: struct ksensor sc_sensor[PCAGPIO_NPINS];
! 49: struct ksensordev sc_sensordev;
! 50: };
! 51:
! 52: int pcagpio_match(struct device *, void *, void *);
! 53: void pcagpio_attach(struct device *, struct device *, void *);
! 54: int pcagpio_check(struct i2c_attach_args *, u_int8_t *, u_int8_t *);
! 55: void pcagpio_refresh(void *);
! 56:
! 57: int pcagpio_gpio_pin_read(void *, int);
! 58: void pcagpio_gpio_pin_write(void *, int, int);
! 59: void pcagpio_gpio_pin_ctl(void *, int, int);
! 60:
! 61: struct cfattach pcagpio_ca = {
! 62: sizeof(struct pcagpio_softc), pcagpio_match, pcagpio_attach
! 63: };
! 64:
! 65: struct cfdriver pcagpio_cd = {
! 66: NULL, "pcagpio", DV_DULL
! 67: };
! 68:
! 69: int
! 70: pcagpio_match(struct device *parent, void *match, void *aux)
! 71: {
! 72: struct i2c_attach_args *ia = aux;
! 73:
! 74: if (strcmp(ia->ia_name, "PCA9554") == 0 ||
! 75: strcmp(ia->ia_name, "PCA9554M") == 0 ||
! 76: strcmp(ia->ia_name, "pca9555") == 0 ||
! 77: strcmp(ia->ia_name, "pca9556") == 0 ||
! 78: strcmp(ia->ia_name, "pca9557") == 0)
! 79: return (1);
! 80: return (0);
! 81: }
! 82:
! 83: void
! 84: pcagpio_attach(struct device *parent, struct device *self, void *aux)
! 85: {
! 86: struct pcagpio_softc *sc = (struct pcagpio_softc *)self;
! 87: struct i2c_attach_args *ia = aux;
! 88: struct gpiobus_attach_args gba;
! 89: u_int8_t cmd, data;
! 90: int outputs = 0, i;
! 91:
! 92: sc->sc_tag = ia->ia_tag;
! 93: sc->sc_addr = ia->ia_addr;
! 94:
! 95: cmd = PCA9554_CONFIG;
! 96: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 97: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 98: printf(": failed to initialize\n");
! 99: return;
! 100: }
! 101: sc->sc_control = data;
! 102: cmd = PCA9554_POLARITY;
! 103: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 104: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 105: printf(": failed to initialize\n");
! 106: return;
! 107: }
! 108: sc->sc_polarity = data;
! 109: cmd = PCA9554_OUT;
! 110: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 111: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 112: printf(": failed to initialize\n");
! 113: return;
! 114: }
! 115:
! 116: /* Initialize sensor data. */
! 117: strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
! 118: sizeof(sc->sc_sensordev.xname));
! 119:
! 120: for (i = 0; i < PCAGPIO_NPINS; i++) {
! 121: sc->sc_sensor[i].type = SENSOR_INDICATOR;
! 122: if ((sc->sc_control & (1 << i)) == 0) {
! 123: strlcpy(sc->sc_sensor[i].desc, "out",
! 124: sizeof(sc->sc_sensor[i].desc));
! 125: outputs++;
! 126: } else
! 127: strlcpy(sc->sc_sensor[i].desc, "in",
! 128: sizeof(sc->sc_sensor[i].desc));
! 129:
! 130: }
! 131:
! 132: if (sensor_task_register(sc, pcagpio_refresh, 5) == NULL) {
! 133: printf(", unable to register update task\n");
! 134: return;
! 135: }
! 136:
! 137: #if 0
! 138: for (i = 0; i < PCAGPIO_NPINS; i++)
! 139: sensor_attach(&sc->sc_sensordev, &sc->sc_sensor[i]);
! 140: sensordev_install(&sc->sc_sensordev);
! 141: #endif
! 142:
! 143: printf(":");
! 144: if (PCAGPIO_NPINS - outputs)
! 145: printf(" %d inputs", PCAGPIO_NPINS - outputs);
! 146: if (outputs)
! 147: printf(" %d outputs", outputs);
! 148: printf("\n");
! 149:
! 150: for (i = 0; i < PCAGPIO_NPINS; i++) {
! 151: sc->sc_gpio_pins[i].pin_num = i;
! 152: sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
! 153:
! 154: if ((sc->sc_control & (1 << i)) == 0) {
! 155: sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_OUTPUT;
! 156: sc->sc_gpio_pins[i].pin_state =
! 157: data & (1 << i) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
! 158: }
! 159: }
! 160:
! 161: /* Create controller tag */
! 162: sc->sc_gpio_gc.gp_cookie = sc;
! 163: sc->sc_gpio_gc.gp_pin_read = pcagpio_gpio_pin_read;
! 164: sc->sc_gpio_gc.gp_pin_write = pcagpio_gpio_pin_write;
! 165: sc->sc_gpio_gc.gp_pin_ctl = pcagpio_gpio_pin_ctl;
! 166:
! 167: gba.gba_name = "gpio";
! 168: gba.gba_gc = &sc->sc_gpio_gc;
! 169: gba.gba_pins = sc->sc_gpio_pins;
! 170: gba.gba_npins = PCAGPIO_NPINS;
! 171:
! 172: config_found(&sc->sc_dev, &gba, gpiobus_print);
! 173:
! 174: }
! 175:
! 176: void
! 177: pcagpio_refresh(void *arg)
! 178: {
! 179: struct pcagpio_softc *sc = arg;
! 180: u_int8_t cmd, in, out, bit;
! 181: int i;
! 182:
! 183: iic_acquire_bus(sc->sc_tag, 0);
! 184:
! 185: cmd = PCA9554_IN;
! 186: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 187: sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
! 188: goto invalid;
! 189:
! 190: cmd = PCA9554_OUT;
! 191: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 192: sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
! 193: goto invalid;
! 194:
! 195: for (i = 0; i < PCAGPIO_NPINS; i++) {
! 196: bit = 1 << i;
! 197: if ((sc->sc_control & bit))
! 198: sc->sc_sensor[i].value = (in & bit) ? 1 : 0;
! 199: else
! 200: sc->sc_sensor[i].value = (out & bit) ? 1 : 0;
! 201: }
! 202:
! 203: invalid:
! 204: iic_release_bus(sc->sc_tag, 0);
! 205: }
! 206:
! 207:
! 208: int
! 209: pcagpio_gpio_pin_read(void *arg, int pin)
! 210: {
! 211: struct pcagpio_softc *sc = arg;
! 212: u_int8_t cmd, in;
! 213:
! 214: cmd = PCA9554_IN;
! 215: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 216: sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
! 217: return 0;
! 218: return ((in ^ sc->sc_polarity) & (1 << pin)) ? 1 : 0;
! 219: }
! 220:
! 221: void
! 222: pcagpio_gpio_pin_write(void *arg, int pin, int value)
! 223: {
! 224: struct pcagpio_softc *sc = arg;
! 225: u_int8_t cmd, out, mask;
! 226:
! 227: mask = 0xff ^ (1 << pin);
! 228: cmd = PCA9554_OUT;
! 229: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 230: sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
! 231: return;
! 232: out = (out & mask) | (value << pin);
! 233:
! 234: cmd = PCA9554_OUT;
! 235: if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
! 236: sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
! 237: return;
! 238: }
! 239:
! 240: void
! 241: pcagpio_gpio_pin_ctl(void *arg, int pin, int flags)
! 242: {
! 243: #if 0
! 244: struct pcagpio_softc *sc = arg;
! 245: u_int32_t conf;
! 246:
! 247: pcagpio_gpio_pin_select(sc, pin);
! 248: conf = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
! 249: GSCGPIO_CONF);
! 250:
! 251: conf &= ~(GSCGPIO_CONF_OUTPUTEN | GSCGPIO_CONF_PUSHPULL |
! 252: GSCGPIO_CONF_PULLUP);
! 253: if ((flags & GPIO_PIN_TRISTATE) == 0)
! 254: conf |= GSCGPIO_CONF_OUTPUTEN;
! 255: if (flags & GPIO_PIN_PUSHPULL)
! 256: conf |= GSCGPIO_CONF_PUSHPULL;
! 257: if (flags & GPIO_PIN_PULLUP)
! 258: conf |= GSCGPIO_CONF_PULLUP;
! 259: bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
! 260: GSCGPIO_CONF, conf);
! 261: #endif
! 262: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to pca9554.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / dev / i2c