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()
184 		scllo(adap);  in i2c_outb()
186 	sdahi(adap);  in i2c_outb()
187 	if (sclhi(adap) < 0) { /* timeout */  in i2c_outb()
196 	ack = !getsda(adap);    /* ack: sda is pulled low -> success */  in i2c_outb()
200 	scllo(adap);  in i2c_outb()
212 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in i2c_inb()  local
215 	sdahi(adap);  in i2c_inb()
217 		if (sclhi(adap) < 0) { /* timeout */  in i2c_inb()
223 		if (getsda(adap))  in i2c_inb()
225 		setscl(adap, 0);  in i2c_inb()
226 		udelay(i == 7 ? adap->udelay / 2 : adap->udelay);  in i2c_inb()
238 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in test_bus()  local
242 	if (adap->pre_xfer) {  in test_bus()
243 		ret = adap->pre_xfer(i2c_adap);  in test_bus()
248 	if (adap->getscl == NULL)  in test_bus()
251 	sda = getsda(adap);  in test_bus()
252 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
260 	sdalo(adap);  in test_bus()
261 	sda = getsda(adap);  in test_bus()
262 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
273 	sdahi(adap);  in test_bus()
274 	sda = getsda(adap);  in test_bus()
275 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
286 	scllo(adap);  in test_bus()
287 	sda = getsda(adap);  in test_bus()
288 	scl = (adap->getscl == NULL) ? 0 : getscl(adap);  in test_bus()
299 	sclhi(adap);  in test_bus()
300 	sda = getsda(adap);  in test_bus()
301 	scl = (adap->getscl == NULL) ? 1 : getscl(adap);  in test_bus()
312 	if (adap->post_xfer)  in test_bus()
313 		adap->post_xfer(i2c_adap);  in test_bus()
318 	sdahi(adap);  in test_bus()
319 	sclhi(adap);  in test_bus()
321 	if (adap->post_xfer)  in test_bus()
322 		adap->post_xfer(i2c_adap);  in test_bus()
340 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in try_address()  local
348 		i2c_stop(adap);  in try_address()
349 		udelay(adap->udelay);  in try_address()
352 		i2c_start(adap);  in try_address()
405 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in acknak()  local
409 		setsda(adap, 0);  in acknak()
410 	udelay((adap->udelay + 1) / 2);  in acknak()
411 	if (sclhi(adap) < 0) {	/* timeout */  in acknak()
415 	scllo(adap);  in acknak()
483 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_doAddress()  local
511 			i2c_repstart(adap);  in bit_doAddress()
539 	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;  in bit_xfer()  local
543 	if (adap->pre_xfer) {  in bit_xfer()
544 		ret = adap->pre_xfer(i2c_adap);  in bit_xfer()
550 	i2c_start(adap);  in bit_xfer()
558 				i2c_repstart(adap);  in bit_xfer()
596 	i2c_stop(adap);  in bit_xfer()
598 	if (adap->post_xfer)  in bit_xfer()
599 		adap->post_xfer(i2c_adap);  in bit_xfer()
603 static u32 bit_func(struct i2c_adapter *adap)  in bit_func()  argument
623 static int __i2c_bit_add_bus(struct i2c_adapter *adap,  in __i2c_bit_add_bus()  argument
626 	struct i2c_algo_bit_data *bit_adap = adap->algo_data;  in __i2c_bit_add_bus()
630 		ret = test_bus(adap);  in __i2c_bit_add_bus()
636 	adap->algo = &i2c_bit_algo;  in __i2c_bit_add_bus()
637 	adap->retries = 3;  in __i2c_bit_add_bus()
639 	ret = add_adapter(adap);  in __i2c_bit_add_bus()
645 		dev_warn(&adap->dev, "Not I2C compliant: can't read SCL\n");  in __i2c_bit_add_bus()
646 		dev_warn(&adap->dev, "Bus may be unreliable\n");  in __i2c_bit_add_bus()
651 int i2c_bit_add_bus(struct i2c_adapter *adap)  in i2c_bit_add_bus()  argument
653 	return __i2c_bit_add_bus(adap, i2c_add_adapter);  in i2c_bit_add_bus()
657 int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)  in i2c_bit_add_numbered_bus()  argument
659 	return __i2c_bit_add_bus(adap, i2c_add_numbered_adapter);  in i2c_bit_add_numbered_bus()