[mirror_ubuntu-focal-kernel.git] / drivers / i2c / busses / i2c-powermac.c

/*
    i2c Support for Apple SMU Controller

    Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
                       <benh@kernel.crashing.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/of_irq.h>
#include <asm/prom.h>
#include <asm/pmac_low_i2c.h>

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
MODULE_LICENSE("GPL");

/*
 * SMBUS-type transfer entrypoint
 */
static s32 i2c_powermac_smbus_xfer(	struct i2c_adapter*	adap,
					u16			addr,
					unsigned short		flags,
					char			read_write,
					u8			command,
					int			size,
					union i2c_smbus_data*	data)
{
	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);
	int			rc = 0;
	int			read = (read_write == I2C_SMBUS_READ);
	int			addrdir = (addr << 1) | read;
	int			mode, subsize, len;
	u32			subaddr;
	u8			*buf;
	u8			local[2];

	if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
		mode = pmac_i2c_mode_std;
		subsize = 0;
		subaddr = 0;
	} else {
		mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
		subsize = 1;
		subaddr = command;
	}

	switch (size) {
        case I2C_SMBUS_QUICK:
		buf = NULL;
		len = 0;
	    	break;
        case I2C_SMBUS_BYTE:
        case I2C_SMBUS_BYTE_DATA:
		buf = &data->byte;
		len = 1;
	    	break;
        case I2C_SMBUS_WORD_DATA:
		if (!read) {
			local[0] = data->word & 0xff;
			local[1] = (data->word >> 8) & 0xff;
		}
		buf = local;
		len = 2;
	    	break;

	/* Note that these are broken vs. the expected smbus API where
	 * on reads, the length is actually returned from the function,
	 * but I think the current API makes no sense and I don't want
	 * any driver that I haven't verified for correctness to go
	 * anywhere near a pmac i2c bus anyway ...
	 *
	 * I'm also not completely sure what kind of phases to do between
	 * the actual command and the data (what I am _supposed_ to do that
	 * is). For now, I assume writes are a single stream and reads have
	 * a repeat start/addr phase (but not stop in between)
	 */
        case I2C_SMBUS_BLOCK_DATA:
		buf = data->block;
		len = data->block[0] + 1;
		break;
	case I2C_SMBUS_I2C_BLOCK_DATA:
		buf = &data->block[1];
		len = data->block[0];
		break;

        default:
		return -EINVAL;
	}

	rc = pmac_i2c_open(bus, 0);
	if (rc) {
		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
		return rc;
	}

	rc = pmac_i2c_setmode(bus, mode);
	if (rc) {
		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
			mode, rc);
		goto bail;
	}

	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
	if (rc) {
		if (rc == -ENXIO)
			dev_dbg(&adap->dev,
				"I2C transfer at 0x%02x failed, size %d, "
				"err %d\n", addrdir >> 1, size, rc);
		else
			dev_err(&adap->dev,
				"I2C transfer at 0x%02x failed, size %d, "
				"err %d\n", addrdir >> 1, size, rc);
		goto bail;
	}

	if (size == I2C_SMBUS_WORD_DATA && read) {
		data->word = ((u16)local[1]) << 8;
		data->word |= local[0];
	}

 bail:
	pmac_i2c_close(bus);
	return rc;
}

/*
 * Generic i2c master transfer entrypoint. This driver only support single
 * messages (for "lame i2c" transfers). Anything else should use the smbus
 * entry point
 */
static int i2c_powermac_master_xfer(	struct i2c_adapter *adap,
					struct i2c_msg *msgs,
					int num)
{
	struct pmac_i2c_bus	*bus = i2c_get_adapdata(adap);
	int			rc = 0;
	int			read;
	int			addrdir;

	if (num != 1) {
		dev_err(&adap->dev,
			"Multi-message I2C transactions not supported\n");
		return -EOPNOTSUPP;
	}

	if (msgs->flags & I2C_M_TEN)
		return -EINVAL;
	read = (msgs->flags & I2C_M_RD) != 0;
	addrdir = (msgs->addr << 1) | read;

	rc = pmac_i2c_open(bus, 0);
	if (rc) {
		dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
		return rc;
	}
	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
	if (rc) {
		dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
			pmac_i2c_mode_std, rc);
		goto bail;
	}
	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
	if (rc < 0) {
		if (rc == -ENXIO)
			dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
				addrdir & 1 ? "read from" : "write to",
				addrdir >> 1, rc);
		else
			dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
				addrdir & 1 ? "read from" : "write to",
				addrdir >> 1, rc);
	}
 bail:
	pmac_i2c_close(bus);
	return rc < 0 ? rc : 1;
}

static u32 i2c_powermac_func(struct i2c_adapter * adapter)
{
	return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
}

/* For now, we only handle smbus */
static const struct i2c_algorithm i2c_powermac_algorithm = {
	.smbus_xfer	= i2c_powermac_smbus_xfer,
	.master_xfer	= i2c_powermac_master_xfer,
	.functionality	= i2c_powermac_func,
};


static int i2c_powermac_remove(struct platform_device *dev)
{
	struct i2c_adapter	*adapter = platform_get_drvdata(dev);

	i2c_del_adapter(adapter);
	memset(adapter, 0, sizeof(*adapter));

	return 0;
}

static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
					   struct pmac_i2c_bus *bus,
					   struct device_node *node)
{
	const __be32 *prop;
	int len;

	/* First check for valid "reg" */
	prop = of_get_property(node, "reg", &len);
	if (prop && (len >= sizeof(int)))
		return (be32_to_cpup(prop) & 0xff) >> 1;

	/* Then check old-style "i2c-address" */
	prop = of_get_property(node, "i2c-address", &len);
	if (prop && (len >= sizeof(int)))
		return (be32_to_cpup(prop) & 0xff) >> 1;

	/* Now handle some devices with missing "reg" properties */
	if (!strcmp(node->name, "cereal"))
		return 0x60;
	else if (!strcmp(node->name, "deq"))
		return 0x34;

	dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);

	return 0xffffffff;
}

static void i2c_powermac_create_one(struct i2c_adapter *adap,
					      const char *type,
					      u32 addr)
{
	struct i2c_board_info info = {};
	struct i2c_client *newdev;

	strncpy(info.type, type, sizeof(info.type));
	info.addr = addr;
	newdev = i2c_new_device(adap, &info);
	if (!newdev)
		dev_err(&adap->dev,
			"i2c-powermac: Failure to register missing %s\n",
			type);
}

static void i2c_powermac_add_missing(struct i2c_adapter *adap,
					       struct pmac_i2c_bus *bus,
					       bool found_onyx)
{
	struct device_node *busnode = pmac_i2c_get_bus_node(bus);
	int rc;

	/* Check for the onyx audio codec */
#define ONYX_REG_CONTROL		67
	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
		union i2c_smbus_data data;

		rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
				    ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
				    &data);
		if (rc >= 0)
			i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);

		rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
				    ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
				    &data);
		if (rc >= 0)
			i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
	}
}

static bool i2c_powermac_get_type(struct i2c_adapter *adap,
					    struct device_node *node,
					    u32 addr, char *type, int type_size)
{
	char tmp[16];

	/* Note: we to _NOT_ want the standard
	 * i2c drivers to match with any of our powermac stuff
	 * unless they have been specifically modified to handle
	 * it on a case by case basis. For example, for thermal
	 * control, things like lm75 etc... shall match with their
	 * corresponding windfarm drivers, _NOT_ the generic ones,
	 * so we force a prefix of AAPL, onto the modalias to
	 * make that happen
	 */

	/* First try proper modalias */
	if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
		snprintf(type, type_size, "MAC,%s", tmp);
		return true;
	}

	/* Now look for known workarounds */
	if (!strcmp(node->name, "deq")) {
		/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
		if (addr == 0x34) {
			snprintf(type, type_size, "MAC,tas3001");
			return true;
		} else if (addr == 0x35) {
			snprintf(type, type_size, "MAC,tas3004");
			return true;
		}
	}

	dev_err(&adap->dev, "i2c-powermac: modalias failure"
		" on %s\n", node->full_name);
	return false;
}

static void i2c_powermac_register_devices(struct i2c_adapter *adap,
						    struct pmac_i2c_bus *bus)
{
	struct i2c_client *newdev;
	struct device_node *node;
	bool found_onyx = 0;

	/*
	 * In some cases we end up with the via-pmu node itself, in this
	 * case we skip this function completely as the device-tree will
	 * not contain anything useful.
	 */
	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
		return;

	for_each_child_of_node(adap->dev.of_node, node) {
		struct i2c_board_info info = {};
		u32 addr;

		/* Get address & channel */
		addr = i2c_powermac_get_addr(adap, bus, node);
		if (addr == 0xffffffff)
			continue;

		/* Multibus setup, check channel */
		if (!pmac_i2c_match_adapter(node, adap))
			continue;

		dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
			node->full_name);

		/*
		 * Keep track of some device existence to handle
		 * workarounds later.
		 */
		if (of_device_is_compatible(node, "pcm3052"))
			found_onyx = true;

		/* Make up a modalias */
		if (!i2c_powermac_get_type(adap, node, addr,
					   info.type, sizeof(info.type))) {
			continue;
		}

		/* Fill out the rest of the info structure */
		info.addr = addr;
		info.irq = irq_of_parse_and_map(node, 0);
		info.of_node = of_node_get(node);

		newdev = i2c_new_device(adap, &info);
		if (!newdev) {
			dev_err(&adap->dev, "i2c-powermac: Failure to register"
				" %s\n", node->full_name);
			of_node_put(node);
			/* We do not dispose of the interrupt mapping on
			 * purpose. It's not necessary (interrupt cannot be
			 * re-used) and somebody else might have grabbed it
			 * via direct DT lookup so let's not bother
			 */
			continue;
		}
	}

	/* Additional workarounds */
	i2c_powermac_add_missing(adap, bus, found_onyx);
}

static int i2c_powermac_probe(struct platform_device *dev)
{
	struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
	struct device_node *parent = NULL;
	struct i2c_adapter *adapter;
	const char *basename;
	int rc;

	if (bus == NULL)
		return -EINVAL;
	adapter = pmac_i2c_get_adapter(bus);

	/* Ok, now we need to make up a name for the interface that will
	 * match what we used to do in the past, that is basically the
	 * controller's parent device node for keywest. PMU didn't have a
	 * naming convention and SMU has a different one
	 */
	switch(pmac_i2c_get_type(bus)) {
	case pmac_i2c_bus_keywest:
		parent = of_get_parent(pmac_i2c_get_controller(bus));
		if (parent == NULL)
			return -EINVAL;
		basename = parent->name;
		break;
	case pmac_i2c_bus_pmu:
		basename = "pmu";
		break;
	case pmac_i2c_bus_smu:
		/* This is not what we used to do but I'm fixing drivers at
		 * the same time as this change
		 */
		basename = "smu";
		break;
	default:
		return -EINVAL;
	}
	snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
		 pmac_i2c_get_channel(bus));
	of_node_put(parent);

	platform_set_drvdata(dev, adapter);
	adapter->algo = &i2c_powermac_algorithm;
	i2c_set_adapdata(adapter, bus);
	adapter->dev.parent = &dev->dev;

	/* Clear of_node to skip automatic registration of i2c child nodes */
	adapter->dev.of_node = NULL;
	rc = i2c_add_adapter(adapter);
	if (rc) {
		printk(KERN_ERR "i2c-powermac: Adapter %s registration "
		       "failed\n", adapter->name);
		memset(adapter, 0, sizeof(*adapter));
		return rc;
	}

	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);

	/* Use custom child registration due to Apple device-tree funkyness */
	adapter->dev.of_node = dev->dev.of_node;
	i2c_powermac_register_devices(adapter, bus);

	return 0;
}

static struct platform_driver i2c_powermac_driver = {
	.probe = i2c_powermac_probe,
	.remove = i2c_powermac_remove,
	.driver = {
		.name = "i2c-powermac",
		.bus = &platform_bus_type,
	},
};

module_platform_driver(i2c_powermac_driver);

MODULE_ALIAS("platform:i2c-powermac");
Commit	Line	Data
a28d3af2 BH	1	/*
	2	i2c Support for Apple SMU Controller
	3
	4	Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
	5	<benh@kernel.crashing.org>
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20
	21	*/
	22
a28d3af2 BH	23	#include <linux/module.h>
	24	#include <linux/kernel.h>
	25	#include <linux/types.h>
	26	#include <linux/i2c.h>
	27	#include <linux/init.h>
a28d3af2 BH	28	#include <linux/device.h>
a28d3af2 BH	29	#include <linux/platform_device.h>
5af50730	30	#include <linux/of_irq.h>
a28d3af2 BH	31	#include <asm/prom.h>
	32	#include <asm/pmac_low_i2c.h>
	33
	34	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	35	MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
	36	MODULE_LICENSE("GPL");
	37
	38	/*
	39	* SMBUS-type transfer entrypoint
	40	*/
	41	static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
	42	u16 addr,
	43	unsigned short flags,
	44	char read_write,
	45	u8 command,
	46	int size,
	47	union i2c_smbus_data* data)
	48	{
	49	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	50	int rc = 0;
	51	int read = (read_write == I2C_SMBUS_READ);
	52	int addrdir = (addr << 1) \| read;
02864d58 JD	53	int mode, subsize, len;
	54	u32 subaddr;
	55	u8 *buf;
a28d3af2 BH	56	u8 local[2];
a28d3af2 BH	57
02864d58 JD	58	if (size == I2C_SMBUS_QUICK \|\| size == I2C_SMBUS_BYTE) {
	59	mode = pmac_i2c_mode_std;
	60	subsize = 0;
	61	subaddr = 0;
	62	} else {
	63	mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
	64	subsize = 1;
	65	subaddr = command;
	66	}
a28d3af2 BH	67
	68	switch (size) {
	69	case I2C_SMBUS_QUICK:
02864d58 JD	70	buf = NULL;
02864d58 JD	71	len = 0;
a28d3af2 BH	72	break;
a28d3af2 BH	73	case I2C_SMBUS_BYTE:
a28d3af2	74	case I2C_SMBUS_BYTE_DATA:
02864d58 JD	75	buf = &data->byte;
02864d58 JD	76	len = 1;
a28d3af2 BH	77	break;
a28d3af2 BH	78	case I2C_SMBUS_WORD_DATA:
a28d3af2 BH	79	if (!read) {
	80	local[0] = data->word & 0xff;
	81	local[1] = (data->word >> 8) & 0xff;
	82	}
02864d58 JD	83	buf = local;
02864d58 JD	84	len = 2;
a28d3af2 BH	85	break;
	86
	87	/* Note that these are broken vs. the expected smbus API where
96acafe0	88	* on reads, the length is actually returned from the function,
a28d3af2 BH	89	* but I think the current API makes no sense and I don't want
	90	* any driver that I haven't verified for correctness to go
	91	* anywhere near a pmac i2c bus anyway ...
	92	*
	93	* I'm also not completely sure what kind of phases to do between
	94	* the actual command and the data (what I am _supposed_ to do that
	95	* is). For now, I assume writes are a single stream and reads have
	96	* a repeat start/addr phase (but not stop in between)
	97	*/
	98	case I2C_SMBUS_BLOCK_DATA:
02864d58 JD	99	buf = data->block;
02864d58 JD	100	len = data->block[0] + 1;
a28d3af2 BH	101	break;
a28d3af2 BH	102	case I2C_SMBUS_I2C_BLOCK_DATA:
02864d58 JD	103	buf = &data->block[1];
02864d58 JD	104	len = data->block[0];
a28d3af2 BH	105	break;
	106
	107	default:
02864d58	108	return -EINVAL;
a28d3af2	109	}
02864d58 JD	110
02864d58 JD	111	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	112	if (rc) {
d7d838a6 JD	113	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
02864d58	114	return rc;
d7d838a6	115	}
02864d58 JD	116
02864d58 JD	117	rc = pmac_i2c_setmode(bus, mode);
d7d838a6 JD	118	if (rc) {
	119	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	120	mode, rc);
02864d58	121	goto bail;
d7d838a6	122	}
02864d58 JD	123
02864d58 JD	124	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
d7d838a6	125	if (rc) {
8e4b980c JD	126	if (rc == -ENXIO)
	127	dev_dbg(&adap->dev,
	128	"I2C transfer at 0x%02x failed, size %d, "
	129	"err %d\n", addrdir >> 1, size, rc);
	130	else
	131	dev_err(&adap->dev,
	132	"I2C transfer at 0x%02x failed, size %d, "
	133	"err %d\n", addrdir >> 1, size, rc);
02864d58	134	goto bail;
d7d838a6	135	}
02864d58 JD	136
	137	if (size == I2C_SMBUS_WORD_DATA && read) {
	138	data->word = ((u16)local[1]) << 8;
	139	data->word \|= local[0];
	140	}
	141
a28d3af2 BH	142	bail:
	143	pmac_i2c_close(bus);
	144	return rc;
	145	}
	146
	147	/*
	148	* Generic i2c master transfer entrypoint. This driver only support single
	149	* messages (for "lame i2c" transfers). Anything else should use the smbus
	150	* entry point
	151	*/
	152	static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
	153	struct i2c_msg *msgs,
	154	int num)
	155	{
	156	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	157	int rc = 0;
	158	int read;
	159	int addrdir;
	160
6f7e549f JD	161	if (num != 1) {
	162	dev_err(&adap->dev,
	163	"Multi-message I2C transactions not supported\n");
	164	return -EOPNOTSUPP;
	165	}
	166
a28d3af2 BH	167	if (msgs->flags & I2C_M_TEN)
	168	return -EINVAL;
	169	read = (msgs->flags & I2C_M_RD) != 0;
	170	addrdir = (msgs->addr << 1) \| read;
a28d3af2 BH	171
a28d3af2 BH	172	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	173	if (rc) {
d7d838a6 JD	174	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
a28d3af2	175	return rc;
d7d838a6	176	}
a28d3af2	177	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
d7d838a6 JD	178	if (rc) {
	179	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	180	pmac_i2c_mode_std, rc);
a28d3af2	181	goto bail;
d7d838a6	182	}
a28d3af2	183	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
8e4b980c JD	184	if (rc < 0) {
	185	if (rc == -ENXIO)
	186	dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	187	addrdir & 1 ? "read from" : "write to",
	188	addrdir >> 1, rc);
	189	else
	190	dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	191	addrdir & 1 ? "read from" : "write to",
	192	addrdir >> 1, rc);
	193	}
a28d3af2 BH	194	bail:
a28d3af2 BH	195	pmac_i2c_close(bus);
8ced8eee	196	return rc < 0 ? rc : 1;
a28d3af2 BH	197	}
	198
	199	static u32 i2c_powermac_func(struct i2c_adapter * adapter)
	200	{
	201	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	202	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	203	I2C_FUNC_SMBUS_BLOCK_DATA \| I2C_FUNC_I2C;
	204	}
	205
	206	/* For now, we only handle smbus */
8f9082c5	207	static const struct i2c_algorithm i2c_powermac_algorithm = {
a28d3af2 BH	208	.smbus_xfer = i2c_powermac_smbus_xfer,
	209	.master_xfer = i2c_powermac_master_xfer,
	210	.functionality = i2c_powermac_func,
	211	};
	212
	213
0b255e92	214	static int i2c_powermac_remove(struct platform_device *dev)
a28d3af2	215	{
9f2545c1	216	struct i2c_adapter *adapter = platform_get_drvdata(dev);
bf51a8c5 LPC	217
bf51a8c5 LPC	218	i2c_del_adapter(adapter);
6dfa5ca3	219	memset(adapter, 0, sizeof(*adapter));
a28d3af2 BH	220
	221	return 0;
	222	}
	223
0b255e92	224	static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
3a3dd018 BH	225	struct pmac_i2c_bus *bus,
	226	struct device_node *node)
	227	{
	228	const __be32 *prop;
	229	int len;
	230
	231	/* First check for valid "reg" */
	232	prop = of_get_property(node, "reg", &len);
	233	if (prop && (len >= sizeof(int)))
	234	return (be32_to_cpup(prop) & 0xff) >> 1;
	235
	236	/* Then check old-style "i2c-address" */
	237	prop = of_get_property(node, "i2c-address", &len);
	238	if (prop && (len >= sizeof(int)))
	239	return (be32_to_cpup(prop) & 0xff) >> 1;
	240
	241	/* Now handle some devices with missing "reg" properties */
	242	if (!strcmp(node->name, "cereal"))
	243	return 0x60;
	244	else if (!strcmp(node->name, "deq"))
	245	return 0x34;
	246
	247	dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
	248
	249	return 0xffffffff;
	250	}
	251
0b255e92	252	static void i2c_powermac_create_one(struct i2c_adapter *adap,
3a3dd018 BH	253	const char *type,
	254	u32 addr)
	255	{
	256	struct i2c_board_info info = {};
	257	struct i2c_client *newdev;
	258
	259	strncpy(info.type, type, sizeof(info.type));
	260	info.addr = addr;
	261	newdev = i2c_new_device(adap, &info);
	262	if (!newdev)
	263	dev_err(&adap->dev,
	264	"i2c-powermac: Failure to register missing %s\n",
	265	type);
	266	}
	267
0b255e92	268	static void i2c_powermac_add_missing(struct i2c_adapter *adap,
3a3dd018 BH	269	struct pmac_i2c_bus *bus,
	270	bool found_onyx)
	271	{
	272	struct device_node *busnode = pmac_i2c_get_bus_node(bus);
	273	int rc;
	274
	275	/* Check for the onyx audio codec */
	276	#define ONYX_REG_CONTROL 67
	277	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
	278	union i2c_smbus_data data;
	279
	280	rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
	281	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	282	&data);
	283	if (rc >= 0)
	284	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
	285
	286	rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
	287	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	288	&data);
	289	if (rc >= 0)
	290	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
	291	}
	292	}
	293
0b255e92	294	static bool i2c_powermac_get_type(struct i2c_adapter *adap,
3a3dd018 BH	295	struct device_node *node,
	296	u32 addr, char *type, int type_size)
	297	{
	298	char tmp[16];
	299
	300	/* Note: we to _NOT_ want the standard
	301	* i2c drivers to match with any of our powermac stuff
	302	* unless they have been specifically modified to handle
	303	* it on a case by case basis. For example, for thermal
	304	* control, things like lm75 etc... shall match with their
	305	* corresponding windfarm drivers, _NOT_ the generic ones,
	306	* so we force a prefix of AAPL, onto the modalias to
	307	* make that happen
	308	*/
	309
	310	/* First try proper modalias */
	311	if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
	312	snprintf(type, type_size, "MAC,%s", tmp);
	313	return true;
	314	}
	315
	316	/* Now look for known workarounds */
	317	if (!strcmp(node->name, "deq")) {
	318	/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
	319	if (addr == 0x34) {
	320	snprintf(type, type_size, "MAC,tas3001");
	321	return true;
	322	} else if (addr == 0x35) {
	323	snprintf(type, type_size, "MAC,tas3004");
	324	return true;
	325	}
	326	}
	327
	328	dev_err(&adap->dev, "i2c-powermac: modalias failure"
	329	" on %s\n", node->full_name);
	330	return false;
	331	}
	332
0b255e92	333	static void i2c_powermac_register_devices(struct i2c_adapter *adap,
81e5d864 BH	334	struct pmac_i2c_bus *bus)
	335	{
	336	struct i2c_client *newdev;
	337	struct device_node *node;
3a3dd018 BH	338	bool found_onyx = 0;
	339
	340	/*
	341	* In some cases we end up with the via-pmu node itself, in this
	342	* case we skip this function completely as the device-tree will
	343	* not contain anything useful.
	344	*/
	345	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
	346	return;
81e5d864 BH	347
	348	for_each_child_of_node(adap->dev.of_node, node) {
	349	struct i2c_board_info info = {};
81e5d864	350	u32 addr;
81e5d864 BH	351
81e5d864 BH	352	/* Get address & channel */
3a3dd018 BH	353	addr = i2c_powermac_get_addr(adap, bus, node);
3a3dd018 BH	354	if (addr == 0xffffffff)
81e5d864	355	continue;
81e5d864 BH	356
	357	/* Multibus setup, check channel */
	358	if (!pmac_i2c_match_adapter(node, adap))
	359	continue;
	360
	361	dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
	362	node->full_name);
	363
3a3dd018 BH	364	/*
	365	* Keep track of some device existence to handle
	366	* workarounds later.
81e5d864	367	*/
3a3dd018 BH	368	if (of_device_is_compatible(node, "pcm3052"))
	369	found_onyx = true;
	370
	371	/* Make up a modalias */
	372	if (!i2c_powermac_get_type(adap, node, addr,
	373	info.type, sizeof(info.type))) {
81e5d864 BH	374	continue;
81e5d864 BH	375	}
81e5d864 BH	376
81e5d864 BH	377	/* Fill out the rest of the info structure */
3a3dd018	378	info.addr = addr;
81e5d864 BH	379	info.irq = irq_of_parse_and_map(node, 0);
81e5d864 BH	380	info.of_node = of_node_get(node);
81e5d864 BH	381
	382	newdev = i2c_new_device(adap, &info);
	383	if (!newdev) {
	384	dev_err(&adap->dev, "i2c-powermac: Failure to register"
	385	" %s\n", node->full_name);
	386	of_node_put(node);
	387	/* We do not dispose of the interrupt mapping on
	388	* purpose. It's not necessary (interrupt cannot be
	389	* re-used) and somebody else might have grabbed it
	390	* via direct DT lookup so let's not bother
	391	*/
	392	continue;
	393	}
	394	}
3a3dd018 BH	395
	396	/* Additional workarounds */
	397	i2c_powermac_add_missing(adap, bus, found_onyx);
81e5d864	398	}
a28d3af2	399
0b255e92	400	static int i2c_powermac_probe(struct platform_device *dev)
a28d3af2	401	{
6d4028c6	402	struct pmac_i2c_bus *bus = dev_get_platdata(&dev->dev);
a28d3af2 BH	403	struct device_node *parent = NULL;
a28d3af2 BH	404	struct i2c_adapter *adapter;
018a3d1d	405	const char *basename;
a28d3af2 BH	406	int rc;
	407
	408	if (bus == NULL)
	409	return -EINVAL;
bc6286e5	410	adapter = pmac_i2c_get_adapter(bus);
a28d3af2 BH	411
	412	/* Ok, now we need to make up a name for the interface that will
	413	* match what we used to do in the past, that is basically the
	414	* controller's parent device node for keywest. PMU didn't have a
	415	* naming convention and SMU has a different one
	416	*/
	417	switch(pmac_i2c_get_type(bus)) {
	418	case pmac_i2c_bus_keywest:
	419	parent = of_get_parent(pmac_i2c_get_controller(bus));
	420	if (parent == NULL)
	421	return -EINVAL;
	422	basename = parent->name;
	423	break;
	424	case pmac_i2c_bus_pmu:
	425	basename = "pmu";
	426	break;
	427	case pmac_i2c_bus_smu:
	428	/* This is not what we used to do but I'm fixing drivers at
	429	* the same time as this change
	430	*/
	431	basename = "smu";
	432	break;
	433	default:
	434	return -EINVAL;
	435	}
bc6286e5 JD	436	snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
bc6286e5 JD	437	pmac_i2c_get_channel(bus));
a28d3af2 BH	438	of_node_put(parent);
a28d3af2 BH	439
9f2545c1	440	platform_set_drvdata(dev, adapter);
a28d3af2 BH	441	adapter->algo = &i2c_powermac_algorithm;
a28d3af2 BH	442	i2c_set_adapdata(adapter, bus);
9f2545c1	443	adapter->dev.parent = &dev->dev;
687b81d0 WS	444
	445	/* Clear of_node to skip automatic registration of i2c child nodes */
	446	adapter->dev.of_node = NULL;
a28d3af2 BH	447	rc = i2c_add_adapter(adapter);
	448	if (rc) {
	449	printk(KERN_ERR "i2c-powermac: Adapter %s registration "
bc6286e5	450	"failed\n", adapter->name);
6dfa5ca3	451	memset(adapter, 0, sizeof(*adapter));
874e955b	452	return rc;
a28d3af2 BH	453	}
a28d3af2 BH	454
bc6286e5	455	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
810ad7b6	456
687b81d0 WS	457	/* Use custom child registration due to Apple device-tree funkyness */
687b81d0 WS	458	adapter->dev.of_node = dev->dev.of_node;
81e5d864	459	i2c_powermac_register_devices(adapter, bus);
810ad7b6	460
874e955b	461	return 0;
a28d3af2 BH	462	}
a28d3af2 BH	463
9f2545c1	464	static struct platform_driver i2c_powermac_driver = {
a28d3af2	465	.probe = i2c_powermac_probe,
0b255e92	466	.remove = i2c_powermac_remove,
9f2545c1 BH	467	.driver = {
	468	.name = "i2c-powermac",
	469	.bus = &platform_bus_type,
	470	},
a28d3af2 BH	471	};
a28d3af2 BH	472
a3664b51	473	module_platform_driver(i2c_powermac_driver);
a28d3af2	474
a3664b51	475	MODULE_ALIAS("platform:i2c-powermac");