48 #define setsda(adap, val)	adap->setsda(adap->data, val)  argument
49 #define setscl(adap, val)	adap->setscl(adap->data, val)  argument
50 #define getsda(adap)		adap->getsda(adap->data)  argument
51 #define getscl(adap)		adap->getscl(adap->data)  argument
53 static inline void sdalo(struct i2c_algo_bit_data *adap)  in sdalo()  argument
55 	setsda(adap, 0);  in sdalo()
56 	udelay((adap->udelay + 1) / 2);  in sdalo()
59 static inline void sdahi(struct i2c_algo_bit_data *adap)  in sdahi()  argument
61 	setsda(adap, 1);  in sdahi()
62 	udelay((adap->udelay + 1) / 2);  in sdahi()
65 static inline void scllo(struct i2c_algo_bit_data *adap)  in scllo()  argument
67 	setscl(adap, 0);  in scllo()
68 	udelay(adap->udelay / 2);  in scllo()
75 static int sclhi(struct i2c_algo_bit_data *adap)  in sclhi()  argument
79 	setscl(adap, 1);  in sclhi()
82 	if (!adap->getscl)  in sclhi()
86 	while (!getscl(adap)) {  in sclhi()
92 		if (time_after(jiffies, start + adap->timeout)) {  in sclhi()
96 			if (getscl(adap))  in sclhi()
109 	udelay(adap->udelay);  in sclhi()
115 static void i2c_start(struct i2c_algo_bit_data *adap)  in i2c_start()  argument
118 	setsda(adap, 0);  in i2c_start()
119 	udelay(adap->udelay);  in i2c_start()
120 	scllo(adap);  in i2c_start()
123 static void i2c_repstart(struct i2c_algo_bit_data *adap)  in i2c_repstart()  argument
126 	sdahi(adap);  in i2c_repstart()
127 	sclhi(adap);  in i2c_repstart()
128 	setsda(adap, 0);  in i2c_repstart()
129 	udelay(adap->udelay);  in i2c_repstart()
130 	scllo(adap);  in i2c_repstart()
134 static void i2c_stop(struct i2c_algo_bit_data *adap)  in i2c_stop()  argument
137 	sdalo(adap);  in i2c_stop()
138 	sclhi(adap);  in i2c_stop()
139 	setsda(adap, 1);  in i2c_stop()
140 	udelay(adap->udelay);  in i2c_stop()
157 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in i2c_outb()  local
162 		setsda(adap, sb);  in i2c_outb()
163 		udelay((adap->udelay + 1) / 2);  in i2c_outb()
164 		if (sclhi(adap) < 0) { /* timed out */  in i2c_outb()
176 		scllo(adap);  in i2c_outb()
178 	sdahi(adap);  in i2c_outb()
179 	if (sclhi(adap) < 0) { /* timeout */  in i2c_outb()
188 	ack = !getsda(adap);    /* ack: sda is pulled low -> success */  in i2c_outb()
192 	scllo(adap);  in i2c_outb()
204 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in i2c_inb()  local
207 	sdahi(adap);  in i2c_inb()
209 		if (sclhi(adap) < 0) { /* timeout */  in i2c_inb()
216 		if (getsda(adap))  in i2c_inb()
218 		setscl(adap, 0);  in i2c_inb()
219 		udelay(i == 7 ? adap->udelay / 2 : adap->udelay);  in i2c_inb()
231 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in test_bus()  local
235 	if (adap->pre_xfer) {  in test_bus()
236 		ret = adap->pre_xfer(i2c_adap);  in test_bus()
241 	if (adap->getscl == NULL)  in test_bus()
244 	sda = getsda(adap);  in test_bus()
245 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
253 	sdalo(adap);  in test_bus()
254 	sda = getsda(adap);  in test_bus()
255 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
267 	sdahi(adap);  in test_bus()
268 	sda = getsda(adap);  in test_bus()
269 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
281 	scllo(adap);  in test_bus()
282 	sda = getsda(adap);  in test_bus()
283 	scl = (adap->getscl == NULL) ? 0 : getscl(adap);  in test_bus()
295 	sclhi(adap);  in test_bus()
296 	sda = getsda(adap);  in test_bus()
297 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
309 	if (adap->post_xfer)  in test_bus()
310 		adap->post_xfer(i2c_adap);  in test_bus()
315 	sdahi(adap);  in test_bus()
316 	sclhi(adap);  in test_bus()
318 	if (adap->post_xfer)  in test_bus()
319 		adap->post_xfer(i2c_adap);  in test_bus()
337 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in try_address()  local
345 		i2c_stop(adap);  in try_address()
346 		udelay(adap->udelay);  in try_address()
349 		i2c_start(adap);  in try_address()
402 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in acknak()  local
406 		setsda(adap, 0);  in acknak()
407 	udelay((adap->udelay + 1) / 2);  in acknak()
408 	if (sclhi(adap) < 0) {	/* timeout */  in acknak()
412 	scllo(adap);  in acknak()
481 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_doAddress()  local
509 			i2c_repstart(adap);  in bit_doAddress()
535 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_xfer()  local
539 	if (adap->pre_xfer) {  in bit_xfer()
540 		ret = adap->pre_xfer(i2c_adap);  in bit_xfer()
546 	i2c_start(adap);  in bit_xfer()
555 					i2c_stop(adap);  in bit_xfer()
556 					i2c_start(adap);  in bit_xfer()
560 					i2c_repstart(adap);  in bit_xfer()
599 	i2c_stop(adap);  in bit_xfer()
601 	if (adap->post_xfer)  in bit_xfer()
602 		adap->post_xfer(i2c_adap);  in bit_xfer()
615 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_xfer_atomic()  local
617 	if (!adap->can_do_atomic)  in bit_xfer_atomic()
623 static u32 bit_func(struct i2c_adapter *adap)  in bit_func()  argument
646 static int __i2c_bit_add_bus(struct i2c_adapter *adap,  in __i2c_bit_add_bus()  argument
649 	struct i2c_algo_bit_data *bit_adap = adap->algo_data;  in __i2c_bit_add_bus()
653 		ret = test_bus(adap);  in __i2c_bit_add_bus()
659 	adap->algo = &i2c_bit_algo;  in __i2c_bit_add_bus()
660 	adap->retries = 3;  in __i2c_bit_add_bus()
662 		adap->quirks = &i2c_bit_quirk_no_clk_stretch;  in __i2c_bit_add_bus()
669 	ret = add_adapter(adap);  in __i2c_bit_add_bus()
675 		dev_warn(&adap->dev, "Not I2C compliant: can't read SCL\n");  in __i2c_bit_add_bus()
676 		dev_warn(&adap->dev, "Bus may be unreliable\n");  in __i2c_bit_add_bus()
681 int i2c_bit_add_bus(struct i2c_adapter *adap)  in i2c_bit_add_bus()  argument
683 	return __i2c_bit_add_bus(adap, i2c_add_adapter);  in i2c_bit_add_bus()
687 int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)  in i2c_bit_add_numbered_bus()  argument
689 	return __i2c_bit_add_bus(adap, i2c_add_numbered_adapter);  in i2c_bit_add_numbered_bus()