57 #define setsda(adap, val)	adap->setsda(adap->data, val)  argument
58 #define setscl(adap, val)	adap->setscl(adap->data, val)  argument
59 #define getsda(adap)		adap->getsda(adap->data)  argument
60 #define getscl(adap)		adap->getscl(adap->data)  argument
62 static inline void sdalo(struct i2c_algo_bit_data *adap)  in sdalo()  argument
64 	setsda(adap, 0);  in sdalo()
65 	udelay((adap->udelay + 1) / 2);  in sdalo()
68 static inline void sdahi(struct i2c_algo_bit_data *adap)  in sdahi()  argument
70 	setsda(adap, 1);  in sdahi()
71 	udelay((adap->udelay + 1) / 2);  in sdahi()
74 static inline void scllo(struct i2c_algo_bit_data *adap)  in scllo()  argument
76 	setscl(adap, 0);  in scllo()
77 	udelay(adap->udelay / 2);  in scllo()
84 static int sclhi(struct i2c_algo_bit_data *adap)  in sclhi()  argument
88 	setscl(adap, 1);  in sclhi()
91 	if (!adap->getscl)  in sclhi()
95 	while (!getscl(adap)) {  in sclhi()
101 		if (time_after(jiffies, start + adap->timeout)) {  in sclhi()
105 			if (getscl(adap))  in sclhi()
118 	udelay(adap->udelay);  in sclhi()
124 static void i2c_start(struct i2c_algo_bit_data *adap)  in i2c_start()  argument
127 	setsda(adap, 0);  in i2c_start()
128 	udelay(adap->udelay);  in i2c_start()
129 	scllo(adap);  in i2c_start()
132 static void i2c_repstart(struct i2c_algo_bit_data *adap)  in i2c_repstart()  argument
135 	sdahi(adap);  in i2c_repstart()
136 	sclhi(adap);  in i2c_repstart()
137 	setsda(adap, 0);  in i2c_repstart()
138 	udelay(adap->udelay);  in i2c_repstart()
139 	scllo(adap);  in i2c_repstart()
143 static void i2c_stop(struct i2c_algo_bit_data *adap)  in i2c_stop()  argument
146 	sdalo(adap);  in i2c_stop()
147 	sclhi(adap);  in i2c_stop()
148 	setsda(adap, 1);  in i2c_stop()
149 	udelay(adap->udelay);  in i2c_stop()
166 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in i2c_outb()  local
171 		setsda(adap, sb);  in i2c_outb()
172 		udelay((adap->udelay + 1) / 2);  in i2c_outb()
173 		if (sclhi(adap) < 0) { /* timed out */  in i2c_outb()
185 		scllo(adap);  in i2c_outb()
187 	sdahi(adap);  in i2c_outb()
188 	if (sclhi(adap) < 0) { /* timeout */  in i2c_outb()
197 	ack = !getsda(adap);    /* ack: sda is pulled low -> success */  in i2c_outb()
201 	scllo(adap);  in i2c_outb()
213 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in i2c_inb()  local
216 	sdahi(adap);  in i2c_inb()
218 		if (sclhi(adap) < 0) { /* timeout */  in i2c_inb()
225 		if (getsda(adap))  in i2c_inb()
227 		setscl(adap, 0);  in i2c_inb()
228 		udelay(i == 7 ? adap->udelay / 2 : adap->udelay);  in i2c_inb()
240 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in test_bus()  local
244 	if (adap->pre_xfer) {  in test_bus()
245 		ret = adap->pre_xfer(i2c_adap);  in test_bus()
250 	if (adap->getscl == NULL)  in test_bus()
253 	sda = getsda(adap);  in test_bus()
254 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
262 	sdalo(adap);  in test_bus()
263 	sda = getsda(adap);  in test_bus()
264 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
276 	sdahi(adap);  in test_bus()
277 	sda = getsda(adap);  in test_bus()
278 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
290 	scllo(adap);  in test_bus()
291 	sda = getsda(adap);  in test_bus()
292 	scl = (adap->getscl == NULL) ? 0 : getscl(adap);  in test_bus()
304 	sclhi(adap);  in test_bus()
305 	sda = getsda(adap);  in test_bus()
306 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
318 	if (adap->post_xfer)  in test_bus()
319 		adap->post_xfer(i2c_adap);  in test_bus()
324 	sdahi(adap);  in test_bus()
325 	sclhi(adap);  in test_bus()
327 	if (adap->post_xfer)  in test_bus()
328 		adap->post_xfer(i2c_adap);  in test_bus()
346 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in try_address()  local
354 		i2c_stop(adap);  in try_address()
355 		udelay(adap->udelay);  in try_address()
358 		i2c_start(adap);  in try_address()
411 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in acknak()  local
415 		setsda(adap, 0);  in acknak()
416 	udelay((adap->udelay + 1) / 2);  in acknak()
417 	if (sclhi(adap) < 0) {	/* timeout */  in acknak()
421 	scllo(adap);  in acknak()
490 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_doAddress()  local
518 			i2c_repstart(adap);  in bit_doAddress()
544 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_xfer()  local
548 	if (adap->pre_xfer) {  in bit_xfer()
549 		ret = adap->pre_xfer(i2c_adap);  in bit_xfer()
555 	i2c_start(adap);  in bit_xfer()
564 					i2c_stop(adap);  in bit_xfer()
565 					i2c_start(adap);  in bit_xfer()
569 					i2c_repstart(adap);  in bit_xfer()
608 	i2c_stop(adap);  in bit_xfer()
610 	if (adap->post_xfer)  in bit_xfer()
611 		adap->post_xfer(i2c_adap);  in bit_xfer()
615 static u32 bit_func(struct i2c_adapter *adap)  in bit_func()  argument
639 static int __i2c_bit_add_bus(struct i2c_adapter *adap,  in __i2c_bit_add_bus()  argument
642 	struct i2c_algo_bit_data *bit_adap = adap->algo_data;  in __i2c_bit_add_bus()
646 		ret = test_bus(adap);  in __i2c_bit_add_bus()
652 	adap->algo = &i2c_bit_algo;  in __i2c_bit_add_bus()
653 	adap->retries = 3;  in __i2c_bit_add_bus()
655 		adap->quirks = &i2c_bit_quirk_no_clk_stretch;  in __i2c_bit_add_bus()
662 	ret = add_adapter(adap);  in __i2c_bit_add_bus()
668 		dev_warn(&adap->dev, "Not I2C compliant: can't read SCL\n");  in __i2c_bit_add_bus()
669 		dev_warn(&adap->dev, "Bus may be unreliable\n");  in __i2c_bit_add_bus()
674 int i2c_bit_add_bus(struct i2c_adapter *adap)  in i2c_bit_add_bus()  argument
676 	return __i2c_bit_add_bus(adap, i2c_add_adapter);  in i2c_bit_add_bus()
680 int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)  in i2c_bit_add_numbered_bus()  argument
682 	return __i2c_bit_add_bus(adap, i2c_add_numbered_adapter);  in i2c_bit_add_numbered_bus()