[linux-2.6-block.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 <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);
	int			rc;

	rc = i2c_del_adapter(adapter);
	/* We aren't that prepared to deal with this... */
	if (rc)
		printk(KERN_WARNING
		       "i2c-powermac.c: Failed to remove bus %s !\n",
		       adapter->name);
	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->dev.platform_data;
	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;
	adapter->dev.of_node = dev->dev.of_node;
	rc = i2c_add_adapter(adapter);
	if (rc) {
		printk(KERN_ERR "i2c-powermac: Adapter %s registration "
		       "failed\n", adapter->name);
		memset(adapter, 0, sizeof(*adapter));
	}

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

	/* Cannot use of_i2c_register_devices() due to Apple device-tree
	 * funkyness
	 */
	i2c_powermac_register_devices(adapter, bus);

	return rc;
}

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>
	29	#include <linux/platform_device.h>
	30	#include <asm/prom.h>
	31	#include <asm/pmac_low_i2c.h>
	32
	33	MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
	34	MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
	35	MODULE_LICENSE("GPL");
	36
	37	/*
	38	* SMBUS-type transfer entrypoint
	39	*/
	40	static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
	41	u16 addr,
	42	unsigned short flags,
	43	char read_write,
	44	u8 command,
	45	int size,
	46	union i2c_smbus_data* data)
	47	{
	48	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	49	int rc = 0;
	50	int read = (read_write == I2C_SMBUS_READ);
	51	int addrdir = (addr << 1) \| read;
02864d58 JD	52	int mode, subsize, len;
	53	u32 subaddr;
	54	u8 *buf;
a28d3af2 BH	55	u8 local[2];
a28d3af2 BH	56
02864d58 JD	57	if (size == I2C_SMBUS_QUICK \|\| size == I2C_SMBUS_BYTE) {
	58	mode = pmac_i2c_mode_std;
	59	subsize = 0;
	60	subaddr = 0;
	61	} else {
	62	mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
	63	subsize = 1;
	64	subaddr = command;
	65	}
a28d3af2 BH	66
	67	switch (size) {
	68	case I2C_SMBUS_QUICK:
02864d58 JD	69	buf = NULL;
02864d58 JD	70	len = 0;
a28d3af2 BH	71	break;
a28d3af2 BH	72	case I2C_SMBUS_BYTE:
a28d3af2	73	case I2C_SMBUS_BYTE_DATA:
02864d58 JD	74	buf = &data->byte;
02864d58 JD	75	len = 1;
a28d3af2 BH	76	break;
a28d3af2 BH	77	case I2C_SMBUS_WORD_DATA:
a28d3af2 BH	78	if (!read) {
	79	local[0] = data->word & 0xff;
	80	local[1] = (data->word >> 8) & 0xff;
	81	}
02864d58 JD	82	buf = local;
02864d58 JD	83	len = 2;
a28d3af2 BH	84	break;
	85
	86	/* Note that these are broken vs. the expected smbus API where
96acafe0	87	* on reads, the length is actually returned from the function,
a28d3af2 BH	88	* but I think the current API makes no sense and I don't want
	89	* any driver that I haven't verified for correctness to go
	90	* anywhere near a pmac i2c bus anyway ...
	91	*
	92	* I'm also not completely sure what kind of phases to do between
	93	* the actual command and the data (what I am _supposed_ to do that
	94	* is). For now, I assume writes are a single stream and reads have
	95	* a repeat start/addr phase (but not stop in between)
	96	*/
	97	case I2C_SMBUS_BLOCK_DATA:
02864d58 JD	98	buf = data->block;
02864d58 JD	99	len = data->block[0] + 1;
a28d3af2 BH	100	break;
a28d3af2 BH	101	case I2C_SMBUS_I2C_BLOCK_DATA:
02864d58 JD	102	buf = &data->block[1];
02864d58 JD	103	len = data->block[0];
a28d3af2 BH	104	break;
	105
	106	default:
02864d58	107	return -EINVAL;
a28d3af2	108	}
02864d58 JD	109
02864d58 JD	110	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	111	if (rc) {
d7d838a6 JD	112	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
02864d58	113	return rc;
d7d838a6	114	}
02864d58 JD	115
02864d58 JD	116	rc = pmac_i2c_setmode(bus, mode);
d7d838a6 JD	117	if (rc) {
	118	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	119	mode, rc);
02864d58	120	goto bail;
d7d838a6	121	}
02864d58 JD	122
02864d58 JD	123	rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
d7d838a6	124	if (rc) {
8e4b980c JD	125	if (rc == -ENXIO)
	126	dev_dbg(&adap->dev,
	127	"I2C transfer at 0x%02x failed, size %d, "
	128	"err %d\n", addrdir >> 1, size, rc);
	129	else
	130	dev_err(&adap->dev,
	131	"I2C transfer at 0x%02x failed, size %d, "
	132	"err %d\n", addrdir >> 1, size, rc);
02864d58	133	goto bail;
d7d838a6	134	}
02864d58 JD	135
	136	if (size == I2C_SMBUS_WORD_DATA && read) {
	137	data->word = ((u16)local[1]) << 8;
	138	data->word \|= local[0];
	139	}
	140
a28d3af2 BH	141	bail:
	142	pmac_i2c_close(bus);
	143	return rc;
	144	}
	145
	146	/*
	147	* Generic i2c master transfer entrypoint. This driver only support single
	148	* messages (for "lame i2c" transfers). Anything else should use the smbus
	149	* entry point
	150	*/
	151	static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
	152	struct i2c_msg *msgs,
	153	int num)
	154	{
	155	struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
	156	int rc = 0;
	157	int read;
	158	int addrdir;
	159
6f7e549f JD	160	if (num != 1) {
	161	dev_err(&adap->dev,
	162	"Multi-message I2C transactions not supported\n");
	163	return -EOPNOTSUPP;
	164	}
	165
a28d3af2 BH	166	if (msgs->flags & I2C_M_TEN)
	167	return -EINVAL;
	168	read = (msgs->flags & I2C_M_RD) != 0;
	169	addrdir = (msgs->addr << 1) \| read;
a28d3af2 BH	170
a28d3af2 BH	171	rc = pmac_i2c_open(bus, 0);
d7d838a6 JD	172	if (rc) {
d7d838a6 JD	173	dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
a28d3af2	174	return rc;
d7d838a6	175	}
a28d3af2	176	rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
d7d838a6 JD	177	if (rc) {
	178	dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
	179	pmac_i2c_mode_std, rc);
a28d3af2	180	goto bail;
d7d838a6	181	}
a28d3af2	182	rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
8e4b980c JD	183	if (rc < 0) {
	184	if (rc == -ENXIO)
	185	dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	186	addrdir & 1 ? "read from" : "write to",
	187	addrdir >> 1, rc);
	188	else
	189	dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
	190	addrdir & 1 ? "read from" : "write to",
	191	addrdir >> 1, rc);
	192	}
a28d3af2 BH	193	bail:
a28d3af2 BH	194	pmac_i2c_close(bus);
8ced8eee	195	return rc < 0 ? rc : 1;
a28d3af2 BH	196	}
	197
	198	static u32 i2c_powermac_func(struct i2c_adapter * adapter)
	199	{
	200	return I2C_FUNC_SMBUS_QUICK \| I2C_FUNC_SMBUS_BYTE \|
	201	I2C_FUNC_SMBUS_BYTE_DATA \| I2C_FUNC_SMBUS_WORD_DATA \|
	202	I2C_FUNC_SMBUS_BLOCK_DATA \| I2C_FUNC_I2C;
	203	}
	204
	205	/* For now, we only handle smbus */
8f9082c5	206	static const struct i2c_algorithm i2c_powermac_algorithm = {
a28d3af2 BH	207	.smbus_xfer = i2c_powermac_smbus_xfer,
	208	.master_xfer = i2c_powermac_master_xfer,
	209	.functionality = i2c_powermac_func,
	210	};
	211
	212
0b255e92	213	static int i2c_powermac_remove(struct platform_device *dev)
a28d3af2	214	{
9f2545c1	215	struct i2c_adapter *adapter = platform_get_drvdata(dev);
a28d3af2 BH	216	int rc;
	217
	218	rc = i2c_del_adapter(adapter);
a28d3af2 BH	219	/* We aren't that prepared to deal with this... */
a28d3af2 BH	220	if (rc)
154d22b0 FS	221	printk(KERN_WARNING
154d22b0 FS	222	"i2c-powermac.c: Failed to remove bus %s !\n",
a28d3af2	223	adapter->name);
6dfa5ca3	224	memset(adapter, 0, sizeof(*adapter));
a28d3af2 BH	225
	226	return 0;
	227	}
	228
0b255e92	229	static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
3a3dd018 BH	230	struct pmac_i2c_bus *bus,
	231	struct device_node *node)
	232	{
	233	const __be32 *prop;
	234	int len;
	235
	236	/* First check for valid "reg" */
	237	prop = of_get_property(node, "reg", &len);
	238	if (prop && (len >= sizeof(int)))
	239	return (be32_to_cpup(prop) & 0xff) >> 1;
	240
	241	/* Then check old-style "i2c-address" */
	242	prop = of_get_property(node, "i2c-address", &len);
	243	if (prop && (len >= sizeof(int)))
	244	return (be32_to_cpup(prop) & 0xff) >> 1;
	245
	246	/* Now handle some devices with missing "reg" properties */
	247	if (!strcmp(node->name, "cereal"))
	248	return 0x60;
	249	else if (!strcmp(node->name, "deq"))
	250	return 0x34;
	251
	252	dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
	253
	254	return 0xffffffff;
	255	}
	256
0b255e92	257	static void i2c_powermac_create_one(struct i2c_adapter *adap,
3a3dd018 BH	258	const char *type,
	259	u32 addr)
	260	{
	261	struct i2c_board_info info = {};
	262	struct i2c_client *newdev;
	263
	264	strncpy(info.type, type, sizeof(info.type));
	265	info.addr = addr;
	266	newdev = i2c_new_device(adap, &info);
	267	if (!newdev)
	268	dev_err(&adap->dev,
	269	"i2c-powermac: Failure to register missing %s\n",
	270	type);
	271	}
	272
0b255e92	273	static void i2c_powermac_add_missing(struct i2c_adapter *adap,
3a3dd018 BH	274	struct pmac_i2c_bus *bus,
	275	bool found_onyx)
	276	{
	277	struct device_node *busnode = pmac_i2c_get_bus_node(bus);
	278	int rc;
	279
	280	/* Check for the onyx audio codec */
	281	#define ONYX_REG_CONTROL 67
	282	if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
	283	union i2c_smbus_data data;
	284
	285	rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
	286	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	287	&data);
	288	if (rc >= 0)
	289	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
	290
	291	rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
	292	ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
	293	&data);
	294	if (rc >= 0)
	295	i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
	296	}
	297	}
	298
0b255e92	299	static bool i2c_powermac_get_type(struct i2c_adapter *adap,
3a3dd018 BH	300	struct device_node *node,
	301	u32 addr, char *type, int type_size)
	302	{
	303	char tmp[16];
	304
	305	/* Note: we to _NOT_ want the standard
	306	* i2c drivers to match with any of our powermac stuff
	307	* unless they have been specifically modified to handle
	308	* it on a case by case basis. For example, for thermal
	309	* control, things like lm75 etc... shall match with their
	310	* corresponding windfarm drivers, _NOT_ the generic ones,
	311	* so we force a prefix of AAPL, onto the modalias to
	312	* make that happen
	313	*/
	314
	315	/* First try proper modalias */
	316	if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
	317	snprintf(type, type_size, "MAC,%s", tmp);
	318	return true;
	319	}
	320
	321	/* Now look for known workarounds */
	322	if (!strcmp(node->name, "deq")) {
	323	/* Apple uses address 0x34 for TAS3001 and 0x35 for TAS3004 */
	324	if (addr == 0x34) {
	325	snprintf(type, type_size, "MAC,tas3001");
	326	return true;
	327	} else if (addr == 0x35) {
	328	snprintf(type, type_size, "MAC,tas3004");
	329	return true;
	330	}
	331	}
	332
	333	dev_err(&adap->dev, "i2c-powermac: modalias failure"
	334	" on %s\n", node->full_name);
	335	return false;
	336	}
	337
0b255e92	338	static void i2c_powermac_register_devices(struct i2c_adapter *adap,
81e5d864 BH	339	struct pmac_i2c_bus *bus)
	340	{
	341	struct i2c_client *newdev;
	342	struct device_node *node;
3a3dd018 BH	343	bool found_onyx = 0;
	344
	345	/*
	346	* In some cases we end up with the via-pmu node itself, in this
	347	* case we skip this function completely as the device-tree will
	348	* not contain anything useful.
	349	*/
	350	if (!strcmp(adap->dev.of_node->name, "via-pmu"))
	351	return;
81e5d864 BH	352
	353	for_each_child_of_node(adap->dev.of_node, node) {
	354	struct i2c_board_info info = {};
81e5d864	355	u32 addr;
81e5d864 BH	356
81e5d864 BH	357	/* Get address & channel */
3a3dd018 BH	358	addr = i2c_powermac_get_addr(adap, bus, node);
3a3dd018 BH	359	if (addr == 0xffffffff)
81e5d864	360	continue;
81e5d864 BH	361
	362	/* Multibus setup, check channel */
	363	if (!pmac_i2c_match_adapter(node, adap))
	364	continue;
	365
	366	dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
	367	node->full_name);
	368
3a3dd018 BH	369	/*
	370	* Keep track of some device existence to handle
	371	* workarounds later.
81e5d864	372	*/
3a3dd018 BH	373	if (of_device_is_compatible(node, "pcm3052"))
	374	found_onyx = true;
	375
	376	/* Make up a modalias */
	377	if (!i2c_powermac_get_type(adap, node, addr,
	378	info.type, sizeof(info.type))) {
81e5d864 BH	379	continue;
81e5d864 BH	380	}
81e5d864 BH	381
81e5d864 BH	382	/* Fill out the rest of the info structure */
3a3dd018	383	info.addr = addr;
81e5d864 BH	384	info.irq = irq_of_parse_and_map(node, 0);
81e5d864 BH	385	info.of_node = of_node_get(node);
81e5d864 BH	386
	387	newdev = i2c_new_device(adap, &info);
	388	if (!newdev) {
	389	dev_err(&adap->dev, "i2c-powermac: Failure to register"
	390	" %s\n", node->full_name);
	391	of_node_put(node);
	392	/* We do not dispose of the interrupt mapping on
	393	* purpose. It's not necessary (interrupt cannot be
	394	* re-used) and somebody else might have grabbed it
	395	* via direct DT lookup so let's not bother
	396	*/
	397	continue;
	398	}
	399	}
3a3dd018 BH	400
	401	/* Additional workarounds */
	402	i2c_powermac_add_missing(adap, bus, found_onyx);
81e5d864	403	}
a28d3af2	404
0b255e92	405	static int i2c_powermac_probe(struct platform_device *dev)
a28d3af2	406	{
9f2545c1	407	struct pmac_i2c_bus *bus = dev->dev.platform_data;
a28d3af2 BH	408	struct device_node *parent = NULL;
a28d3af2 BH	409	struct i2c_adapter *adapter;
018a3d1d	410	const char *basename;
a28d3af2 BH	411	int rc;
	412
	413	if (bus == NULL)
	414	return -EINVAL;
bc6286e5	415	adapter = pmac_i2c_get_adapter(bus);
a28d3af2 BH	416
	417	/* Ok, now we need to make up a name for the interface that will
	418	* match what we used to do in the past, that is basically the
	419	* controller's parent device node for keywest. PMU didn't have a
	420	* naming convention and SMU has a different one
	421	*/
	422	switch(pmac_i2c_get_type(bus)) {
	423	case pmac_i2c_bus_keywest:
	424	parent = of_get_parent(pmac_i2c_get_controller(bus));
	425	if (parent == NULL)
	426	return -EINVAL;
	427	basename = parent->name;
	428	break;
	429	case pmac_i2c_bus_pmu:
	430	basename = "pmu";
	431	break;
	432	case pmac_i2c_bus_smu:
	433	/* This is not what we used to do but I'm fixing drivers at
	434	* the same time as this change
	435	*/
	436	basename = "smu";
	437	break;
	438	default:
	439	return -EINVAL;
	440	}
bc6286e5 JD	441	snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
bc6286e5 JD	442	pmac_i2c_get_channel(bus));
a28d3af2 BH	443	of_node_put(parent);
a28d3af2 BH	444
9f2545c1	445	platform_set_drvdata(dev, adapter);
a28d3af2 BH	446	adapter->algo = &i2c_powermac_algorithm;
a28d3af2 BH	447	i2c_set_adapdata(adapter, bus);
9f2545c1	448	adapter->dev.parent = &dev->dev;
81e5d864	449	adapter->dev.of_node = dev->dev.of_node;
a28d3af2 BH	450	rc = i2c_add_adapter(adapter);
	451	if (rc) {
	452	printk(KERN_ERR "i2c-powermac: Adapter %s registration "
bc6286e5	453	"failed\n", adapter->name);
6dfa5ca3	454	memset(adapter, 0, sizeof(*adapter));
a28d3af2 BH	455	}
a28d3af2 BH	456
bc6286e5	457	printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
810ad7b6	458
81e5d864 BH	459	/* Cannot use of_i2c_register_devices() due to Apple device-tree
	460	* funkyness
	461	*/
	462	i2c_powermac_register_devices(adapter, bus);
810ad7b6	463
a28d3af2 BH	464	return rc;
	465	}
	466
9f2545c1	467	static struct platform_driver i2c_powermac_driver = {
a28d3af2	468	.probe = i2c_powermac_probe,
0b255e92	469	.remove = i2c_powermac_remove,
9f2545c1 BH	470	.driver = {
	471	.name = "i2c-powermac",
	472	.bus = &platform_bus_type,
	473	},
a28d3af2 BH	474	};
a28d3af2 BH	475
a3664b51	476	module_platform_driver(i2c_powermac_driver);
a28d3af2	477
a3664b51	478	MODULE_ALIAS("platform:i2c-powermac");