1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
31  * Autoconfiguration and support routines for the Philips serial I2C bus
37 #include <sys/bus.h>
51 /* See comments below for why auto-scanning is a bad idea. */
54 SYSCTL_NODE(_hw, OID_AUTO, i2c, CTLFLAG_RW, 0, "i2c controls");
60 	device_set_desc(dev, "Philips I2C bus");  in iicbus_probe()
102 	sc->dev = dev;  in iicbus_attach_common()
103 	mtx_init(&sc->lock, "iicbus", NULL, MTX_DEF);  in iicbus_attach_common()
108 		sc->strict = strict;  in iicbus_attach_common()
110 		sc->strict = 1;  in iicbus_attach_common()
112 	/* device probing is meaningless since the bus is supposed to be  in iicbus_attach_common()
113 	 * hot-plug. Moreover, some I2C chips do not appreciate random  in iicbus_attach_common()
150 	mtx_destroy(&sc->lock);  in iicbus_detach()
161 	if (devi->addr != 0)  in iicbus_print_child()
162 		retval += printf(" at addr %#x", devi->addr);  in iicbus_print_child()
163 	resource_list_print_type(&devi->rl, "irq", SYS_RES_IRQ, "%jd");  in iicbus_print_child()
170 iicbus_probe_nomatch(device_t bus, device_t child)  in iicbus_probe_nomatch()  argument
174 	device_printf(bus, "<unknown card> at addr %#x\n", devi->addr);  in iicbus_probe_nomatch()
178 iicbus_child_location(device_t bus, device_t child, struct sbuf *sb)  in iicbus_child_location()  argument
182 	sbuf_printf(sb, "addr=%#x", devi->addr);  in iicbus_child_location()
187 iicbus_child_pnpinfo(device_t bus, device_t child, struct sbuf *sb)  in iicbus_child_pnpinfo()  argument
193 iicbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)  in iicbus_read_ivar()  argument
201 		*result = devi->addr;  in iicbus_read_ivar()
208 iicbus_write_ivar(device_t bus, device_t child, int which, uintptr_t value)  in iicbus_write_ivar()  argument
216 		if (devi->addr != 0)  in iicbus_write_ivar()
218 		devi->addr = value;  in iicbus_write_ivar()
224 iicbus_add_child_common(device_t dev, u_int order, const char *name, int unit,  in iicbus_add_child_common()  argument
230 	child = device_add_child_ordered(dev, order, name, unit);  in iicbus_add_child_common()
238 	resource_list_init(&devi->rl);  in iicbus_add_child_common()
244 iicbus_add_child(device_t dev, u_int order, const char *name, int unit)  in iicbus_add_child()  argument
248 	    dev, order, name, unit, sizeof(struct iicbus_ivar)));  in iicbus_add_child()
259 	resource_list_free(&devi->rl);  in iicbus_child_deleted()
264 iicbus_hinted_child(device_t bus, const char *dname, int dunit)  in iicbus_hinted_child()  argument
270 	child = BUS_ADD_CHILD(bus, 0, dname, dunit);  in iicbus_hinted_child()
272 	resource_int_value(dname, dunit, "addr", &devi->addr);  in iicbus_hinted_child()
275 			device_printf(bus,  in iicbus_hinted_child()
281 iicbus_get_resource_list(device_t bus __unused, device_t child)  in iicbus_get_resource_list()
286 	return (&devi->rl);  in iicbus_get_resource_list()
316 	 * If a bus frequency value was passed in, use it.  Otherwise initialize  in iicbus_init_frequency()
317 	 * it first to the standard i2c 100KHz frequency, then override that  in iicbus_init_frequency()
321 		sc->bus_freq = bus_freq;  in iicbus_init_frequency()
323 		sc->bus_freq = 100000;  in iicbus_init_frequency()
325 		    "frequency", (int *)&sc->bus_freq);  in iicbus_init_frequency()
328 	 * Set up the sysctl that allows the bus frequency to be changed.  in iicbus_init_frequency()
336 	    OID_AUTO, "frequency", CTLFLAG_RWTUN, &sc->bus_freq,  in iicbus_init_frequency()
337 	    sc->bus_freq, "Bus frequency in Hz");  in iicbus_init_frequency()
346 	 * If the frequency has not been configured for the bus, or the request  in iicbus_get_frequency()
348 	 * use the configured bus speed.  in iicbus_get_frequency()
350 	if (sc->bus_freq == 0 || speed == IIC_SLOW)  in iicbus_get_frequency()
352 	return (sc->bus_freq);  in iicbus_get_frequency()
363 	/* bus interface */