1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
57  * AT24 parts have a "write page size" that differs per-device, and a "read page
68 	int		addr;		/* Slave address on the bus */  member
112 #define CDEV2SOFTC(dev)		((dev)->si_drv1)
135 	    ofw_bus_search_compatible(dev, compat_data)->ocd_data;  in icee_probe()
137 		device_set_desc(dev, d->name);  in icee_probe()
141 	device_set_desc(dev, "I2C EEPROM");  in icee_probe()
154 	    ofw_bus_search_compatible(sc->dev, compat_data)->ocd_data;  in icee_init()
156 		sc->size  = d->size;  in icee_init()
157 		sc->type  = d->type;  in icee_init()
158 		sc->wr_sz = d->wr_sz;  in icee_init()
162 	dname = device_get_name(sc->dev);  in icee_init()
163 	dunit = device_get_unit(sc->dev);  in icee_init()
164 	if (resource_int_value(dname, dunit, "type", &sc->type) != 0)  in icee_init()
166 	if (resource_int_value(dname, dunit, "size", &sc->size) != 0)  in icee_init()
168 	if (resource_int_value(dname, dunit, "wr_sz", &sc->wr_sz) != 0)  in icee_init()
180 	sc->dev = dev;  in icee_attach()
181 	sc->addr = iicbus_get_addr(dev);  in icee_attach()
185 		device_printf(dev, "size: %d bytes, addressing: %d-bits\n",  in icee_attach()
186 		    sc->size, sc->type);  in icee_attach()
187 	sc->cdev = make_dev(&icee_cdevsw, device_get_unit(dev), UID_ROOT,  in icee_attach()
189 	if (sc->cdev == NULL) {  in icee_attach()
192 	sc->cdev->si_drv1 = sc;  in icee_attach()
197 	    &sc->type, 0, "Memory array address size in bits");  in icee_attach()
199 	    &sc->size, 0, "Memory array capacity in bytes");  in icee_attach()
201 	    &sc->wr_sz, 0, "Memory array page write size in bytes");  in icee_attach()
211 	destroy_dev(sc->cdev);  in icee_detach()
219 	uint8_t addr[2];  in icee_read()  local
221 	int error, i, len, slave;  in icee_read()  local
223 	     { 0, IIC_M_WR, 1, addr },  in icee_read()
228 	if (uio->uio_offset == sc->size)  in icee_read()
230 	if (uio->uio_offset > sc->size)  in icee_read()
232 	if (sc->type != 8 && sc->type != 16)  in icee_read()
234 	slave = error = 0;  in icee_read()
235 	while (uio->uio_resid > 0) {  in icee_read()
236 		if (uio->uio_offset >= sc->size)  in icee_read()
238 		len = MIN(MAX_RD_SZ - (uio->uio_offset & (MAX_RD_SZ - 1)),  in icee_read()
239 		    uio->uio_resid);  in icee_read()
240 		switch (sc->type) {  in icee_read()
242 			slave = (uio->uio_offset >> 7) | sc->addr;  in icee_read()
245 			addr[0] = uio->uio_offset & 0xff;  in icee_read()
248 			slave = sc->addr | (uio->uio_offset >> 15);  in icee_read()
251 			addr[0] = (uio->uio_offset >> 8) & 0xff;  in icee_read()
252 			addr[1] = uio->uio_offset & 0xff;  in icee_read()
256 			msgs[i].slave = slave;  in icee_read()
257 		error = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);  in icee_read()
279 	int error, len, slave, waitlimit;  in icee_write()  local
289 	if (uio->uio_offset >= sc->size)  in icee_write()
291 	if (sc->type != 8 && sc->type != 16)  in icee_write()
294 	slave = error = 0;  in icee_write()
295 	while (uio->uio_resid > 0) {  in icee_write()
296 		if (uio->uio_offset >= sc->size)  in icee_write()
298 		len = MIN(sc->wr_sz - (uio->uio_offset & (sc->wr_sz - 1)),  in icee_write()
299 		    uio->uio_resid);  in icee_write()
300 		switch (sc->type) {  in icee_write()
302 			slave = (uio->uio_offset >> 7) | sc->addr;  in icee_write()
304 			data[0] = uio->uio_offset & 0xff;  in icee_write()
307 			slave = sc->addr | (uio->uio_offset >> 15);  in icee_write()
309 			data[0] = (uio->uio_offset >> 8) & 0xff;  in icee_write()
310 			data[1] = uio->uio_offset & 0xff;  in icee_write()
313 		wr[0].slave = slave;  in icee_write()
314 		error = uiomove(data + sc->type / 8, len, uio);  in icee_write()
317 		error = iicbus_transfer_excl(sc->dev, wr, 1, IIC_INTRWAIT);  in icee_write()
322 		/* Read after write to wait for write-done. */  in icee_write()
324 		rd[0].slave = slave;  in icee_write()
326 			error = iicbus_transfer_excl(sc->dev, rd, 1,  in icee_write()
328 		} while (waitlimit-- > 0 && error != 0);  in icee_write()