1 // SPDX-License-Identifier: GPL-2.0-or-later
3     i2c Support for Apple SMU Controller
14 #include <linux/i2c.h>
22 MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
26  * SMBUS-type transfer entrypoint
36 	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);  in i2c_powermac_smbus_xfer()  local
62 		buf = &data->byte;  in i2c_powermac_smbus_xfer()
67 			local[0] = data->word & 0xff;  in i2c_powermac_smbus_xfer()
68 			local[1] = (data->word >> 8) & 0xff;  in i2c_powermac_smbus_xfer()
78 	 * anywhere near a pmac i2c bus anyway ...  in i2c_powermac_smbus_xfer()
81 		buf = data->block;  in i2c_powermac_smbus_xfer()
82 		len = data->block[0] + 1;  in i2c_powermac_smbus_xfer()
85 		buf = &data->block[1];  in i2c_powermac_smbus_xfer()
86 		len = data->block[0];  in i2c_powermac_smbus_xfer()
90 		return -EINVAL;  in i2c_powermac_smbus_xfer()
93 	rc = pmac_i2c_open(bus, 0);  in i2c_powermac_smbus_xfer()
95 		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);  in i2c_powermac_smbus_xfer()
99 	rc = pmac_i2c_setmode(bus, mode);  in i2c_powermac_smbus_xfer()
101 		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",  in i2c_powermac_smbus_xfer()
106 	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);  in i2c_powermac_smbus_xfer()
108 		if (rc == -ENXIO)  in i2c_powermac_smbus_xfer()
109 			dev_dbg(&adap->dev,  in i2c_powermac_smbus_xfer()
110 				"I2C transfer at 0x%02x failed, size %d, "  in i2c_powermac_smbus_xfer()
113 			dev_err(&adap->dev,  in i2c_powermac_smbus_xfer()
114 				"I2C transfer at 0x%02x failed, size %d, "  in i2c_powermac_smbus_xfer()
120 		data->word = ((u16)local[1]) << 8;  in i2c_powermac_smbus_xfer()
121 		data->word |= local[0];  in i2c_powermac_smbus_xfer()
125 	pmac_i2c_close(bus);  in i2c_powermac_smbus_xfer()
130  * Generic i2c transfer entrypoint. This driver only supports single
131  * messages (for "lame i2c" transfers). Anything else should use the smbus
138 	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);  in i2c_powermac_xfer()  local
142 	if (msgs->flags & I2C_M_TEN)  in i2c_powermac_xfer()
143 		return -EINVAL;  in i2c_powermac_xfer()
146 	rc = pmac_i2c_open(bus, 0);  in i2c_powermac_xfer()
148 		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);  in i2c_powermac_xfer()
151 	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);  in i2c_powermac_xfer()
153 		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",  in i2c_powermac_xfer()
157 	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);  in i2c_powermac_xfer()
159 		if (rc == -ENXIO)  in i2c_powermac_xfer()
160 			dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",  in i2c_powermac_xfer()
164 			dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",  in i2c_powermac_xfer()
169 	pmac_i2c_close(bus);  in i2c_powermac_xfer()
200 					   struct pmac_i2c_bus *bus,  in i2c_powermac_get_addr()  argument
211 	/* Then check old-style "i2c-address" */  in i2c_powermac_get_addr()
212 	ret = of_property_read_u32(node, "i2c-address", &prop);  in i2c_powermac_get_addr()
222 	dev_warn(&adap->dev, "No i2c address for %pOF\n", node);  in i2c_powermac_get_addr()
238 		dev_err(&adap->dev,  in i2c_powermac_create_one()
239 			"i2c-powermac: Failure to register missing %s\n",  in i2c_powermac_create_one()
244 					       struct pmac_i2c_bus *bus,  in i2c_powermac_add_missing()  argument
247 	struct device_node *busnode = pmac_i2c_get_bus_node(bus);  in i2c_powermac_add_missing()
252 	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {  in i2c_powermac_add_missing()
276 	 * Note: we do _NOT_ want the standard i2c drivers to match with any of  in i2c_powermac_get_type()
302 	dev_err(&adap->dev, "i2c-powermac: modalias failure on %pOF\n", node);  in i2c_powermac_get_type()
307 						    struct pmac_i2c_bus *bus)  in i2c_powermac_register_devices()  argument
314 	 * In some cases we end up with the via-pmu node itself, in this  in i2c_powermac_register_devices()
315 	 * case we skip this function completely as the device-tree will  in i2c_powermac_register_devices()
318 	if (of_node_name_eq(adap->dev.of_node, "via-pmu"))  in i2c_powermac_register_devices()
321 	for_each_child_of_node(adap->dev.of_node, node) {  in i2c_powermac_register_devices()
326 		addr = i2c_powermac_get_addr(adap, bus, node);  in i2c_powermac_register_devices()
334 		dev_dbg(&adap->dev, "i2c-powermac: register %pOF\n", node);  in i2c_powermac_register_devices()
356 			dev_err(&adap->dev, "i2c-powermac: Failure to register"  in i2c_powermac_register_devices()
361 			 * re-used) and somebody else might have grabbed it  in i2c_powermac_register_devices()
369 	i2c_powermac_add_missing(adap, bus, found_onyx);  in i2c_powermac_register_devices()
374 	struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);  in i2c_powermac_probe()  local
379 	if (bus == NULL)  in i2c_powermac_probe()
380 		return -EINVAL;  in i2c_powermac_probe()
381 	adapter = pmac_i2c_get_adapter(bus);  in i2c_powermac_probe()
383 	/* Ok, now we need to make up a name for the interface that will  in i2c_powermac_probe()
388 	switch(pmac_i2c_get_type(bus)) {  in i2c_powermac_probe()
390 		parent = of_get_parent(pmac_i2c_get_controller(bus));  in i2c_powermac_probe()
392 			return -EINVAL;  in i2c_powermac_probe()
393 		snprintf(adapter->name, sizeof(adapter->name), "%pOFn %d",  in i2c_powermac_probe()
395 			 pmac_i2c_get_channel(bus));  in i2c_powermac_probe()
399 		snprintf(adapter->name, sizeof(adapter->name), "pmu %d",  in i2c_powermac_probe()
400 			 pmac_i2c_get_channel(bus));  in i2c_powermac_probe()
406 		snprintf(adapter->name, sizeof(adapter->name), "smu %d",  in i2c_powermac_probe()
407 			 pmac_i2c_get_channel(bus));  in i2c_powermac_probe()
410 		return -EINVAL;  in i2c_powermac_probe()
414 	adapter->algo = &i2c_powermac_algorithm;  in i2c_powermac_probe()
415 	adapter->quirks = &i2c_powermac_quirks;  in i2c_powermac_probe()
416 	i2c_set_adapdata(adapter, bus);  in i2c_powermac_probe()
417 	adapter->dev.parent = &dev->dev;  in i2c_powermac_probe()
419 	/* Clear of_node to skip automatic registration of i2c child nodes */  in i2c_powermac_probe()
420 	adapter->dev.of_node = NULL;  in i2c_powermac_probe()
423 		printk(KERN_ERR "i2c-powermac: Adapter %s registration "  in i2c_powermac_probe()
424 		       "failed\n", adapter->name);  in i2c_powermac_probe()
429 	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);  in i2c_powermac_probe()
431 	/* Use custom child registration due to Apple device-tree funkyness */  in i2c_powermac_probe()
432 	adapter->dev.of_node = dev->dev.of_node;  in i2c_powermac_probe()
433 	i2c_powermac_register_devices(adapter, bus);  in i2c_powermac_probe()
442 		.name = "i2c-powermac",
443 		.bus = &platform_bus_type,
449 MODULE_ALIAS("platform:i2c-powermac");