/* $NetBSD: i2c.c,v 1.23 2009/02/03 16:41:31 pgoyette Exp $ */ /* * Copyright (c) 2003 Wasabi Systems, Inc. * All rights reserved. * * Written by Jason R. Thorpe for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: i2c.c,v 1.23 2009/02/03 16:41:31 pgoyette Exp $"); #include #include #include #include #include #include #include #include #include #include #include "locators.h" #include struct iic_softc { i2c_tag_t sc_tag; int sc_type; }; static void iic_smbus_intr_thread(void *); int iicbus_print(void *aux, const char *pnp) { if (pnp != NULL) aprint_normal("iic at %s", pnp); return (UNCONF); } static int iic_print(void *aux, const char *pnp) { struct i2c_attach_args *ia = aux; if (ia->ia_addr != (i2c_addr_t)-1) aprint_normal(" addr 0x%x", ia->ia_addr); return (UNCONF); } static int iic_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) { struct iic_softc *sc = device_private(parent); struct i2c_attach_args ia; ia.ia_tag = sc->sc_tag; ia.ia_addr = cf->cf_loc[IICCF_ADDR]; ia.ia_size = cf->cf_loc[IICCF_SIZE]; ia.ia_type = sc->sc_type; if (config_match(parent, cf, &ia) > 0) config_attach(parent, cf, &ia, iic_print); return (0); } static int iic_match(device_t parent, cfdata_t cf, void *aux) { return (1); } static void iic_attach(device_t parent, device_t self, void *aux) { struct iic_softc *sc = device_private(self); struct i2cbus_attach_args *iba = aux; i2c_tag_t ic; int rv; aprint_naive(": I2C bus\n"); aprint_normal(": I2C bus\n"); sc->sc_tag = iba->iba_tag; sc->sc_type = iba->iba_type; ic = sc->sc_tag; ic->ic_devname = device_xname(self); LIST_INIT(&(sc->sc_tag->ic_list)); LIST_INIT(&(sc->sc_tag->ic_proc_list)); rv = kthread_create(PRI_NONE, 0, NULL, iic_smbus_intr_thread, ic, &ic->ic_intr_thread, "%s", ic->ic_devname); if (rv) aprint_error_dev(self, "unable to create intr thread\n"); #if I2C_SCAN if (sc->sc_type == I2C_TYPE_SMBUS) { int err; int found = 0; i2c_addr_t addr; uint8_t val; for (addr = 0x09; addr < 0x78; addr++) { /* * Skip certain i2c addresses: * 0x00 General Call / START * 0x01 CBUS Address * 0x02 Different Bus format * 0x03 - 0x07 Reserved * 0x08 Host Address * 0x0c Alert Response Address * 0x28 ACCESS.Bus host * 0x37 ACCESS.Bus default address * 0x48 - 0x4b Prototypes * 0x61 Device Default Address * 0x78 - 0x7b 10-bit addresses * 0x7c - 0x7f Reserved * * Some of these are skipped by judicious selection * of the range of the above for (;;) statement. * * if (addr <= 0x08 || addr >= 0x78) * continue; */ if (addr == 0x0c || addr == 0x28 || addr == 0x37 || addr == 0x61 || (addr & 0x7c) == 0x48) continue; iic_acquire_bus(ic, 0); /* * Use SMBus quick_write command to detect most * addresses; should avoid hanging the bus on * some write-only devices (like clocks that show * up at address 0x69) * * XXX The quick_write() is allegedly known to * XXX corrupt the Atmel AT24RF08 EEPROM found * XXX on some IBM Thinkpads! */ if ((addr & 0xf8) == 0x30 || (addr & 0xf0) == 0x50) err = iic_smbus_receive_byte(ic, addr, &val, 0); else err = iic_smbus_quick_write(ic, addr, 0); if (err == 0) { if (found == 0) aprint_normal("%s: devices at", ic->ic_devname); found++; aprint_normal(" 0x%02x", addr); } iic_release_bus(ic, 0); } if (found == 0) aprint_normal("%s: no devices found", ic->ic_devname); aprint_normal("\n"); } #endif if (!pmf_device_register(self, NULL, NULL)) aprint_error_dev(self, "couldn't establish power handler\n"); /* * Attach all i2c devices described in the kernel * configuration file. */ config_search_ia(iic_search, self, "iic", NULL); } static void iic_smbus_intr_thread(void *aux) { i2c_tag_t ic; struct ic_intr_list *il; int rv; ic = (i2c_tag_t)aux; ic->ic_running = 1; ic->ic_pending = 0; while (ic->ic_running) { if (ic->ic_pending == 0) rv = tsleep(ic, PZERO, "iicintr", hz); if (ic->ic_pending > 0) { LIST_FOREACH(il, &(ic->ic_proc_list), il_next) { (*il->il_intr)(il->il_intrarg); } ic->ic_pending--; } } kthread_exit(0); } void * iic_smbus_intr_establish(i2c_tag_t ic, int (*intr)(void *), void *intrarg) { struct ic_intr_list *il; il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); if (il == NULL) return NULL; il->il_intr = intr; il->il_intrarg = intrarg; LIST_INSERT_HEAD(&(ic->ic_list), il, il_next); return il; } void iic_smbus_intr_disestablish(i2c_tag_t ic, void *hdl) { struct ic_intr_list *il; il = (struct ic_intr_list *)hdl; LIST_REMOVE(il, il_next); free(il, M_DEVBUF); return; } void * iic_smbus_intr_establish_proc(i2c_tag_t ic, int (*intr)(void *), void *intrarg) { struct ic_intr_list *il; il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); if (il == NULL) return NULL; il->il_intr = intr; il->il_intrarg = intrarg; LIST_INSERT_HEAD(&(ic->ic_proc_list), il, il_next); return il; } void iic_smbus_intr_disestablish_proc(i2c_tag_t ic, void *hdl) { struct ic_intr_list *il; il = (struct ic_intr_list *)hdl; LIST_REMOVE(il, il_next); free(il, M_DEVBUF); return; } int iic_smbus_intr(i2c_tag_t ic) { struct ic_intr_list *il; LIST_FOREACH(il, &(ic->ic_list), il_next) { (*il->il_intr)(il->il_intrarg); } ic->ic_pending++; wakeup(ic); return 1; } CFATTACH_DECL_NEW(iic, sizeof(struct iic_softc), iic_match, iic_attach, NULL, NULL);