1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
50 #include <sys/kernel.h>
74 	u_char devaddr;			/* slave device address */
90 static int iicsmb_quick(device_t dev, u_char slave, int how);
91 static int iicsmb_sendb(device_t dev, u_char slave, char byte);
92 static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
93 static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
94 static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
95 static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
96 static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
97 static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);
98 static int iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf);
99 static int iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf);
137 	if (device_find_child(parent, "iicsmb", -1) == NULL)  in iicsmb_identify()
153 	mtx_init(&sc->lock, "iicsmb", NULL, MTX_DEF);  in iicsmb_attach()
155 	sc->smbus = device_add_child(dev, "smbus", DEVICE_UNIT_ANY);  in iicsmb_attach()
170 	mtx_destroy(&sc->lock);  in iicsmb_detach()
185 	mtx_lock(&sc->lock);  in iicsmb_intr()
189 		sc->state = SMB_WAITING_ADDR;  in iicsmb_intr()
194 		smbus_intr(sc->smbus, sc->devaddr,  in iicsmb_intr()
195 				sc->low, sc->high, SMB_ENOERR);  in iicsmb_intr()
199 		switch (sc->state) {  in iicsmb_intr()
203 				sc->devaddr & 0xff);  in iicsmb_intr()
207 			sc->devaddr = (u_char)*buf;  in iicsmb_intr()
208 			sc->state = SMB_WAITING_LOW;  in iicsmb_intr()
212 			sc->low = *buf;  in iicsmb_intr()
213 			sc->state = SMB_WAITING_HIGH;  in iicsmb_intr()
217 			sc->high = *buf;  in iicsmb_intr()
218 			sc->state = SMB_DONE;  in iicsmb_intr()
231 			smbus_intr(sc->smbus, sc->devaddr, 0, 0, SMB_EBUSERR);  in iicsmb_intr()
244 	mtx_unlock(&sc->lock);  in iicsmb_intr()
309 iicsmb_quick(device_t dev, u_char slave, int how)  in iicsmb_quick()  argument
312 	     { slave, how == SMB_QWRITE ? IIC_M_WR : IIC_M_RD, 0, NULL },  in iicsmb_quick()
329 iicsmb_sendb(device_t dev, u_char slave, char byte)  in iicsmb_sendb()  argument
332 	     { slave, IIC_M_WR, 1, &byte },  in iicsmb_sendb()
341 iicsmb_recvb(device_t dev, u_char slave, char *byte)  in iicsmb_recvb()  argument
344 	     { slave, IIC_M_RD, 1, byte },  in iicsmb_recvb()
353 iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)  in iicsmb_writeb()  argument
357 	     { slave, IIC_M_WR, nitems(bytes), bytes },  in iicsmb_writeb()
366 iicsmb_writew(device_t dev, u_char slave, char cmd, short word)  in iicsmb_writew()  argument
370 	     { slave, IIC_M_WR, nitems(bytes), bytes },  in iicsmb_writew()
379 iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)  in iicsmb_readb()  argument
382 	     { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },  in iicsmb_readb()
383 	     { slave, IIC_M_RD, 1, byte },  in iicsmb_readb()
392 iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)  in iicsmb_readw()  argument
396 	     { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },  in iicsmb_readw()
397 	     { slave, IIC_M_RD, nitems(buf), buf },  in iicsmb_readw()
408 iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)  in iicsmb_pcall()  argument
413 	     { slave, IIC_M_WR | IIC_M_NOSTOP, nitems(in), in },  in iicsmb_pcall()
414 	     { slave, IIC_M_RD, nitems(out), out },  in iicsmb_pcall()
425 iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)  in iicsmb_bwrite()  argument
429 	     { slave, IIC_M_WR | IIC_M_NOSTOP, nitems(bytes), bytes },  in iicsmb_bwrite()
430 	     { slave, IIC_M_WR | IIC_M_NOSTART, count, buf },  in iicsmb_bwrite()
441 iicsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)  in iicsmb_bread()  argument
444 	     { slave, IIC_M_WR | IIC_M_NOSTOP, 1, &cmd },  in iicsmb_bread()
445 	     { slave, IIC_M_RD | IIC_M_NOSTOP, 1, count },  in iicsmb_bread()
448 	     { slave, IIC_M_RD | IIC_M_NOSTART, 0, buf },  in iicsmb_bread()
459 		 * If the slave offers an empty or a too long reply,  in iicsmb_bread()