33 	 /* sda, scl */
50 static void i2c_gpio_scl_set(struct gpio_desc *scl, int bit)  in i2c_gpio_scl_set()  argument
56 	dm_gpio_set_dir_flags(scl, flags);  in i2c_gpio_scl_set()
59 static void i2c_gpio_write_bit(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_write_bit()  argument
62 	i2c_gpio_scl_set(scl, 0);  in i2c_gpio_write_bit()
66 	i2c_gpio_scl_set(scl, 1);  in i2c_gpio_write_bit()
70 static int i2c_gpio_read_bit(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_read_bit()  argument
75 	i2c_gpio_scl_set(scl, 1);  in i2c_gpio_read_bit()
79 	i2c_gpio_scl_set(scl, 0);  in i2c_gpio_read_bit()
85 /* START: High -> Low on SDA while SCL is High */
86 static void i2c_gpio_send_start(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_send_start()  argument
92 	i2c_gpio_scl_set(scl, 1);  in i2c_gpio_send_start()
98 /* STOP: Low -> High on SDA while SCL is High */
99 static void i2c_gpio_send_stop(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_send_stop()  argument
102 	i2c_gpio_scl_set(scl, 0);  in i2c_gpio_send_stop()
106 	i2c_gpio_scl_set(scl, 1);  in i2c_gpio_send_stop()
113 static void i2c_gpio_send_ack(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_send_ack()  argument
116 	i2c_gpio_write_bit(scl, sda, delay, ack);  in i2c_gpio_send_ack()
117 	i2c_gpio_scl_set(scl, 0);  in i2c_gpio_send_ack()
126 static void i2c_gpio_send_reset(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_send_reset()  argument
132 		i2c_gpio_write_bit(scl, sda, delay, 1);  in i2c_gpio_send_reset()
134 	i2c_gpio_send_stop(scl, sda, delay);  in i2c_gpio_send_reset()
138 static void i2c_gpio_sda_high(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_sda_high()  argument
141 	i2c_gpio_scl_set(scl, 0);  in i2c_gpio_sda_high()
148 static int i2c_gpio_write_byte(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_write_byte()  argument
155 		i2c_gpio_write_bit(scl, sda, delay, data & 0x80);  in i2c_gpio_write_byte()
162 	i2c_gpio_sda_high(scl, sda, delay);  in i2c_gpio_write_byte()
163 	nack = i2c_gpio_read_bit(scl, sda, delay);  in i2c_gpio_write_byte()
172 static uchar i2c_gpio_read_byte(struct gpio_desc *scl, struct gpio_desc *sda,  in i2c_gpio_read_byte()  argument
178 	i2c_gpio_sda_high(scl, sda, delay);  in i2c_gpio_read_byte()
182 		data |= i2c_gpio_read_bit(scl, sda, delay);  in i2c_gpio_read_byte()
184 	i2c_gpio_send_ack(scl, sda, delay, ack);  in i2c_gpio_read_byte()
190 int i2c_send_slave_addr(struct gpio_desc *scl, struct gpio_desc *sda, int delay,  in i2c_send_slave_addr()  argument
193 	i2c_gpio_send_start(scl, sda, delay);  in i2c_send_slave_addr()
195 	if (i2c_gpio_write_byte(scl, sda, delay, chip)) {  in i2c_send_slave_addr()
196 		i2c_gpio_send_stop(scl, sda, delay);  in i2c_send_slave_addr()
207 	struct gpio_desc *scl = &bus->gpios[PIN_SCL];  in i2c_gpio_write_data()  local
214 	if (i2c_send_slave_addr(scl, sda, delay, chip << 1)) {  in i2c_gpio_write_data()
220 		if (i2c_gpio_write_byte(scl, sda, delay, *buffer++))  in i2c_gpio_write_data()
225 		i2c_gpio_send_stop(scl, sda, delay);  in i2c_gpio_write_data()
229 	if (i2c_send_slave_addr(scl, sda, delay, (chip << 1) | 0x1)) {  in i2c_gpio_write_data()
240 	struct gpio_desc *scl = &bus->gpios[PIN_SCL];  in i2c_gpio_read_data()  local
247 		*buffer++ = i2c_gpio_read_byte(scl, sda, delay, len == 0);  in i2c_gpio_read_data()
249 	i2c_gpio_send_stop(scl, sda, delay);  in i2c_gpio_read_data()
280 	struct gpio_desc *scl = &bus->gpios[PIN_SCL];  in i2c_gpio_probe()  local
285 	i2c_gpio_send_start(scl, sda, delay);  in i2c_gpio_probe()
286 	ret = i2c_gpio_write_byte(scl, sda, delay, (chip << 1) | 0);  in i2c_gpio_probe()
287 	i2c_gpio_send_stop(scl, sda, delay);  in i2c_gpio_probe()
298 	struct gpio_desc *scl = &bus->gpios[PIN_SCL];  in i2c_gpio_set_bus_speed()  local
303 	i2c_gpio_send_reset(scl, sda, bus->udelay);  in i2c_gpio_set_bus_speed()