1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
41 #include <dev/iicbus/iicbus.h>
42 #include <dev/iicbus/iiconf.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
50  * Driver for PCF8591 I2C 8-bit ADC and DAC.
77 pcf8591_set_config(device_t dev)  in pcf8591_set_config()  argument
85 	sc = device_get_softc(dev);  in pcf8591_set_config()
86 	data[0] = sc->sc_cfg;  in pcf8591_set_config()
87 	data[1] = sc->sc_output;  in pcf8591_set_config()
88 	msg.slave = sc->sc_addr;  in pcf8591_set_config()
93 	error = iicbus_transfer_excl(dev, &msg, 1, IIC_INTRWAIT);  in pcf8591_set_config()
98 pcf8591_get_reading(device_t dev, uint8_t *reading)  in pcf8591_get_reading()  argument
104 	sc = device_get_softc(dev);  in pcf8591_get_reading()
106 	msg.slave = sc->sc_addr;  in pcf8591_get_reading()
111 	error = iicbus_transfer_excl(dev, &msg, 1, IIC_INTRWAIT);  in pcf8591_get_reading()
116 pcf8591_select_channel(device_t dev, int channel)  in pcf8591_select_channel()  argument
122 	sc = device_get_softc(dev);  in pcf8591_select_channel()
123 	if (channel >= sc->sc_ch_count)  in pcf8591_select_channel()
125 	sc->sc_cfg &= ~CTRL_CH_SELECT_MASK;  in pcf8591_select_channel()
126 	sc->sc_cfg += channel;  in pcf8591_select_channel()
127 	error = pcf8591_set_config(dev);  in pcf8591_select_channel()
135 	error = pcf8591_get_reading(dev, &unused);  in pcf8591_select_channel()
142 	device_t dev;  in pcf8591_channel_sysctl()  local
146 	dev = arg1;  in pcf8591_channel_sysctl()
149 	if (req->oldptr != NULL) {  in pcf8591_channel_sysctl()
150 		error = pcf8591_select_channel(dev, channel);  in pcf8591_channel_sysctl()
153 		error = pcf8591_get_reading(dev, &reading);  in pcf8591_channel_sysctl()
165 	device_t dev;  in pcf8591_start()  local
174 	dev = sc->sc_dev;  in pcf8591_start()
177 	 * Set initial -- and, for the time being, fixed -- configuration.  in pcf8591_start()
178 	 * Channel auto-incrementi is disabled, although it could be more  in pcf8591_start()
183 	sc->sc_cfg = 0;  in pcf8591_start()
184 	sc->sc_output = 0;  in pcf8591_start()
185 	sc->sc_ch_count = 4;  in pcf8591_start()
186 	(void)pcf8591_set_config(dev);  in pcf8591_start()
188 	ctx = device_get_sysctl_ctx(dev);  in pcf8591_start()
189 	tree_node = device_get_sysctl_tree(dev);  in pcf8591_start()
195 	for (int i = 0; i < sc->sc_ch_count; i++) {  in pcf8591_start()
200 		    CTLTYPE_INT | CTLFLAG_RD, dev, i,  in pcf8591_start()
207 pcf8591_probe(device_t dev)  in pcf8591_probe()  argument
210 	if (!ofw_bus_status_okay(dev))  in pcf8591_probe()
213 	device_set_desc(dev, "PCF8591 8-bit ADC / DAC");  in pcf8591_probe()
215 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data)  in pcf8591_probe()
222 pcf8591_attach(device_t dev)  in pcf8591_attach()  argument
226 	sc = device_get_softc(dev);  in pcf8591_attach()
227 	sc->sc_dev = dev;  in pcf8591_attach()
228 	sc->sc_addr = iicbus_get_addr(dev);  in pcf8591_attach()
239 pcf8591_detach(device_t dev)  in pcf8591_detach()  argument