1 // SPDX-License-Identifier: GPL-2.0
3  * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
11 #include <linux/i2c.h>
13 #include <linux/mux/driver.h>
18 #define ADG792A_DISABLE(mux)	(0x50 | (mux))  argument
20 #define ADG792A_MUX(mux, state)	(0xc0 | (((mux) + 1) << 2) | (state))  argument
23 static int adg792a_write_cmd(struct i2c_client *i2c, u8 cmd, int reset)  in adg792a_write_cmd()  argument
31 	return i2c_smbus_write_byte_data(i2c, cmd, data);  in adg792a_write_cmd()
34 static int adg792a_set(struct mux_control *mux, int state)  in adg792a_set()  argument
36 	struct i2c_client *i2c = to_i2c_client(mux->chip->dev.parent);  in adg792a_set()  local
39 	if (mux->chip->controllers == 1) {  in adg792a_set()
40 		/* parallel mux controller operation */  in adg792a_set()
46 		unsigned int controller = mux_control_get_index(mux);  in adg792a_set()
54 	return adg792a_write_cmd(i2c, cmd, 0);  in adg792a_set()
61 static int adg792a_probe(struct i2c_client *i2c)  in adg792a_probe()  argument
63 	struct device *dev = &i2c->dev;  in adg792a_probe()
70 	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))  in adg792a_probe()
71 		return -ENODEV;  in adg792a_probe()
73 	ret = device_property_read_u32(dev, "#mux-control-cells", &cells);  in adg792a_probe()
77 		return -EINVAL;  in adg792a_probe()
83 	mux_chip->ops = &adg792a_ops;  in adg792a_probe()
85 	ret = adg792a_write_cmd(i2c, ADG792A_DISABLE_ALL, 1);  in adg792a_probe()
89 	ret = device_property_read_u32_array(dev, "idle-state",  in adg792a_probe()
91 					     mux_chip->controllers);  in adg792a_probe()
98 	for (i = 0; i < mux_chip->controllers; ++i) {  in adg792a_probe()
99 		struct mux_control *mux = &mux_chip->mux[i];  in adg792a_probe()  local
101 		mux->states = 4;  in adg792a_probe()
107 			mux->idle_state = idle_state[i];  in adg792a_probe()
110 			dev_err(dev, "invalid idle-state %d\n", idle_state[i]);  in adg792a_probe()
111 			return -EINVAL;  in adg792a_probe()
122 		dev_info(dev, "triple pole quadruple throw mux registered\n");  in adg792a_probe()
132 MODULE_DEVICE_TABLE(i2c, adg792a_id);
151 MODULE_DESCRIPTION("Analog Devices ADG792A/G Triple 4:1 mux driver");