54 static void setscl ( struct bit_basher *basher, int state ) {  in setscl()  argument
56 	write_bit ( basher, I2C_BIT_SCL, state );  in setscl()
66 static void setsda ( struct bit_basher *basher, int state ) {  in setsda()  argument
68 	write_bit ( basher, I2C_BIT_SDA, state );  in setsda()
78 static int getsda ( struct bit_basher *basher ) {  in getsda()  argument
80 	state = read_bit ( basher, I2C_BIT_SDA );  in getsda()
90 static void i2c_start ( struct bit_basher *basher ) {  in i2c_start()  argument
91 	setscl ( basher, 1 );  in i2c_start()
92 	setsda ( basher, 0 );  in i2c_start()
93 	setscl ( basher, 0 );  in i2c_start()
94 	setsda ( basher, 1 );  in i2c_start()
103 static void i2c_send_bit ( struct bit_basher *basher, int bit ) {  in i2c_send_bit()  argument
104 	setsda ( basher, bit );  in i2c_send_bit()
105 	setscl ( basher, 1 );  in i2c_send_bit()
106 	setscl ( basher, 0 );  in i2c_send_bit()
107 	setsda ( basher, 1 );  in i2c_send_bit()
116 static int i2c_recv_bit ( struct bit_basher *basher ) {  in i2c_recv_bit()  argument
119 	setscl ( basher, 1 );  in i2c_recv_bit()
120 	bit = getsda ( basher );  in i2c_recv_bit()
121 	setscl ( basher, 0 );  in i2c_recv_bit()
130 static void i2c_stop ( struct bit_basher *basher ) {  in i2c_stop()  argument
131 	setsda ( basher, 0 );  in i2c_stop()
132 	setscl ( basher, 1 );  in i2c_stop()
133 	setsda ( basher, 1 );  in i2c_stop()
146 static int i2c_send_byte ( struct bit_basher *basher, uint8_t byte ) {  in i2c_send_byte()  argument
153 		i2c_send_bit ( basher, byte & 0x80 );  in i2c_send_byte()
158 	ack = ( i2c_recv_bit ( basher ) == 0 );  in i2c_send_byte()
172 static uint8_t i2c_recv_byte ( struct bit_basher *basher ) {  in i2c_recv_byte()  argument
179 		byte |= ( i2c_recv_bit ( basher ) & 0x1 );  in i2c_recv_byte()
183 	i2c_send_bit ( basher, 1 );  in i2c_recv_byte()
198 static int i2c_select ( struct bit_basher *basher, struct i2c_device *i2cdev,  in i2c_select()  argument
205 	i2c_start ( basher );  in i2c_select()
216 		if ( ( rc = i2c_send_byte ( basher, byte ) ) != 0 )  in i2c_select()
233 static int i2c_reset ( struct bit_basher *basher ) {  in i2c_reset()  argument
241 	setscl ( basher, 0 );  in i2c_reset()
242 	setsda ( basher, 1 );  in i2c_reset()
244 		setscl ( basher, 1 );  in i2c_reset()
245 		sda = getsda ( basher );  in i2c_reset()
248 			i2c_start ( basher );  in i2c_reset()
250 			i2c_stop ( basher );  in i2c_reset()
251 			DBGC ( basher, "I2CBIT %p reset after %d attempts\n",  in i2c_reset()
252 			       basher, ( i + 1 ) );  in i2c_reset()
255 		setscl ( basher, 0 );  in i2c_reset()
258 	DBGC ( basher, "I2CBIT %p could not reset after %d attempts\n",  in i2c_reset()
259 	       basher, i );  in i2c_reset()
281 	struct bit_basher *basher = &i2cbit->basher;  in i2c_bit_read()  local
284 	DBGC ( basher, "I2CBIT %p reading from device %x: ",  in i2c_bit_read()
285 	       basher, i2cdev->dev_addr );  in i2c_bit_read()
290 		if ( ( rc = i2c_select ( basher, i2cdev, offset,  in i2c_bit_read()
299 		if ( ( rc = i2c_send_byte ( basher, offset ) ) != 0 )  in i2c_bit_read()
303 		if ( ( rc = i2c_select ( basher, i2cdev, offset,  in i2c_bit_read()
308 		*data = i2c_recv_byte ( basher );  in i2c_bit_read()
309 		DBGC ( basher, "%02x ", *data );  in i2c_bit_read()
312 	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );  in i2c_bit_read()
313 	i2c_stop ( basher );  in i2c_bit_read()
335 	struct bit_basher *basher = &i2cbit->basher;  in i2c_bit_write()  local
338 	DBGC ( basher, "I2CBIT %p writing to device %x: ",  in i2c_bit_write()
339 	       basher, i2cdev->dev_addr );  in i2c_bit_write()
344 		if ( ( rc = i2c_select ( basher, i2cdev, offset,  in i2c_bit_write()
353 		if ( ( rc = i2c_send_byte ( basher, offset ) ) != 0 )  in i2c_bit_write()
357 		DBGC ( basher, "%02x ", *data );  in i2c_bit_write()
358 		if ( ( rc = i2c_send_byte ( basher, *data ) ) != 0 )  in i2c_bit_write()
362 	DBGC ( basher, "%s\n", ( rc ? "failed" : "" ) );  in i2c_bit_write()
363 	i2c_stop ( basher );  in i2c_bit_write()
375 	struct bit_basher *basher = &i2cbit->basher;  in init_i2c_bit_basher()  local
379 	basher->op = bash_op;  in init_i2c_bit_basher()
380 	assert ( basher->op->read != NULL );  in init_i2c_bit_basher()
381 	assert ( basher->op->write != NULL );  in init_i2c_bit_basher()
386 	if ( ( rc = i2c_reset ( basher ) ) != 0 ) {  in init_i2c_bit_basher()
387 		DBGC ( basher, "I2CBIT %p could not reset I2C bus: %s\n",  in init_i2c_bit_basher()
388 		       basher, strerror ( rc ) );  in init_i2c_bit_basher()