52 static void cbus_send_bit(struct cbus_host *host, unsigned bit)  in cbus_send_bit()  argument
54 	gpio_set_value(host->dat_gpio, bit ? 1 : 0);  in cbus_send_bit()
55 	gpio_set_value(host->clk_gpio, 1);  in cbus_send_bit()
56 	gpio_set_value(host->clk_gpio, 0);  in cbus_send_bit()
65 static void cbus_send_data(struct cbus_host *host, unsigned data, unsigned len)  in cbus_send_data()  argument
70 		cbus_send_bit(host, data & (1 << (i - 1)));  in cbus_send_data()
77 static int cbus_receive_bit(struct cbus_host *host)  in cbus_receive_bit()  argument
81 	gpio_set_value(host->clk_gpio, 1);  in cbus_receive_bit()
82 	ret = gpio_get_value(host->dat_gpio);  in cbus_receive_bit()
83 	gpio_set_value(host->clk_gpio, 0);  in cbus_receive_bit()
91 static int cbus_receive_word(struct cbus_host *host)  in cbus_receive_word()  argument
97 		int bit = cbus_receive_bit(host);  in cbus_receive_word()
116 static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,  in cbus_transfer()  argument
123 	spin_lock_irqsave(&host->lock, flags);  in cbus_transfer()
126 	gpio_set_value(host->sel_gpio, 0);  in cbus_transfer()
129 	gpio_direction_output(host->dat_gpio, 1);  in cbus_transfer()
132 	cbus_send_data(host, dev, CBUS_ADDR_BITS);  in cbus_transfer()
135 	cbus_send_bit(host, rw == I2C_SMBUS_READ);  in cbus_transfer()
138 	cbus_send_data(host, reg, CBUS_REG_BITS);  in cbus_transfer()
141 		cbus_send_data(host, data, 16);  in cbus_transfer()
144 		ret = gpio_direction_input(host->dat_gpio);  in cbus_transfer()
146 			dev_dbg(host->dev, "failed setting direction\n");  in cbus_transfer()
149 		gpio_set_value(host->clk_gpio, 1);  in cbus_transfer()
151 		ret = cbus_receive_word(host);  in cbus_transfer()
153 			dev_dbg(host->dev, "failed receiving data\n");  in cbus_transfer()
159 	gpio_set_value(host->sel_gpio, 1);  in cbus_transfer()
160 	gpio_set_value(host->clk_gpio, 1);  in cbus_transfer()
161 	gpio_set_value(host->clk_gpio, 0);  in cbus_transfer()
164 	spin_unlock_irqrestore(&host->lock, flags);  in cbus_transfer()