[deliverable/linux.git] / drivers / video / via / via_i2c.c

/*
 * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

 * 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, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/via-core.h>
#include <linux/via_i2c.h>

/*
 * There can only be one set of these, so there's no point in having
 * them be dynamically allocated...
 */
#define VIAFB_NUM_I2C		5
static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
static struct viafb_dev *i2c_vdev;  /* Passed in from core */

static void via_i2c_setscl(void *data, int state)
{
	u8 val;
	struct via_port_cfg *adap_data = data;
	unsigned long flags;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
	if (state)
		val |= 0x20;
	else
		val &= ~0x20;
	switch (adap_data->type) {
	case VIA_PORT_I2C:
		val |= 0x01;
		break;
	case VIA_PORT_GPIO:
		val |= 0x82;
		break;
	default:
		printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
	}
	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
}

static int via_i2c_getscl(void *data)
{
	struct via_port_cfg *adap_data = data;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	if (adap_data->type == VIA_PORT_GPIO)
		via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
			0, 0x80);
	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
		ret = 1;
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	return ret;
}

static int via_i2c_getsda(void *data)
{
	struct via_port_cfg *adap_data = data;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	if (adap_data->type == VIA_PORT_GPIO)
		via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
			0, 0x40);
	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
		ret = 1;
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	return ret;
}

static void via_i2c_setsda(void *data, int state)
{
	u8 val;
	struct via_port_cfg *adap_data = data;
	unsigned long flags;

	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
	if (state)
		val |= 0x10;
	else
		val &= ~0x10;
	switch (adap_data->type) {
	case VIA_PORT_I2C:
		val |= 0x01;
		break;
	case VIA_PORT_GPIO:
		val |= 0x42;
		break;
	default:
		printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
	}
	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
}

int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
{
	int ret;
	u8 mm1[] = {0x00};
	struct i2c_msg msgs[2];

	if (!via_i2c_par[adap].is_active)
		return -ENODEV;
	*pdata = 0;
	msgs[0].flags = 0;
	msgs[1].flags = I2C_M_RD;
	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	mm1[0] = index;
	msgs[0].len = 1; msgs[1].len = 1;
	msgs[0].buf = mm1; msgs[1].buf = pdata;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	if (ret == 2)
		ret = 0;
	else if (ret >= 0)
		ret = -EIO;

	return ret;
}

int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
{
	int ret;
	u8 msg[2] = { index, data };
	struct i2c_msg msgs;

	if (!via_i2c_par[adap].is_active)
		return -ENODEV;
	msgs.flags = 0;
	msgs.addr = slave_addr / 2;
	msgs.len = 2;
	msgs.buf = msg;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
	if (ret == 1)
		ret = 0;
	else if (ret >= 0)
		ret = -EIO;

	return ret;
}

int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
{
	int ret;
	u8 mm1[] = {0x00};
	struct i2c_msg msgs[2];

	if (!via_i2c_par[adap].is_active)
		return -ENODEV;
	msgs[0].flags = 0;
	msgs[1].flags = I2C_M_RD;
	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	mm1[0] = index;
	msgs[0].len = 1; msgs[1].len = buff_len;
	msgs[0].buf = mm1; msgs[1].buf = buff;
	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	if (ret == 2)
		ret = 0;
	else if (ret >= 0)
		ret = -EIO;

	return ret;
}

/*
 * Allow other viafb subdevices to look up a specific adapter
 * by port name.
 */
struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
{
	struct via_i2c_stuff *stuff = &via_i2c_par[which];

	return &stuff->adapter;
}
EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);


static int create_i2c_bus(struct i2c_adapter *adapter,
			  struct i2c_algo_bit_data *algo,
			  struct via_port_cfg *adap_cfg,
			  struct pci_dev *pdev)
{
	algo->setsda = via_i2c_setsda;
	algo->setscl = via_i2c_setscl;
	algo->getsda = via_i2c_getsda;
	algo->getscl = via_i2c_getscl;
	algo->udelay = 10;
	algo->timeout = 2;
	algo->data = adap_cfg;

	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
		adap_cfg->ioport_index);
	adapter->owner = THIS_MODULE;
	adapter->class = I2C_CLASS_DDC;
	adapter->algo_data = algo;
	if (pdev)
		adapter->dev.parent = &pdev->dev;
	else
		adapter->dev.parent = NULL;
	/* i2c_set_adapdata(adapter, adap_cfg); */

	/* Raise SCL and SDA */
	via_i2c_setsda(adap_cfg, 1);
	via_i2c_setscl(adap_cfg, 1);
	udelay(20);

	return i2c_bit_add_bus(adapter);
}

static int viafb_i2c_probe(struct platform_device *platdev)
{
	int i, ret;
	struct via_port_cfg *configs;

	i2c_vdev = platdev->dev.platform_data;
	configs = i2c_vdev->port_cfg;

	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
		struct via_port_cfg *adap_cfg = configs++;
		struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];

		i2c_stuff->is_active = 0;
		if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
			continue;
		ret = create_i2c_bus(&i2c_stuff->adapter,
				     &i2c_stuff->algo, adap_cfg,
				NULL); /* FIXME: PCIDEV */
		if (ret < 0) {
			printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
				i, ret);
			continue;  /* Still try to make the rest */
		}
		i2c_stuff->is_active = 1;
	}

	return 0;
}

static int viafb_i2c_remove(struct platform_device *platdev)
{
	int i;

	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
		struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
		/*
		 * Only remove those entries in the array that we've
		 * actually used (and thus initialized algo_data)
		 */
		if (i2c_stuff->is_active)
			i2c_del_adapter(&i2c_stuff->adapter);
	}
	return 0;
}

static struct platform_driver via_i2c_driver = {
	.driver = {
		.name = "viafb-i2c",
	},
	.probe = viafb_i2c_probe,
	.remove = viafb_i2c_remove,
};

int viafb_i2c_init(void)
{
	return platform_driver_register(&via_i2c_driver);
}

void viafb_i2c_exit(void)
{
	platform_driver_unregister(&via_i2c_driver);
}
Commit	Line	Data
9f291634	1	/*
277d32a3	2	* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
9f291634 JC	3	* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
	4
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public
	7	* License as published by the Free Software Foundation;
	8	* either version 2, or (at your option) any later version.
	9
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
	12	* the implied warranty of MERCHANTABILITY or FITNESS FOR
	13	* A PARTICULAR PURPOSE.See the GNU General Public License
	14	* for more details.
	15
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc.,
	19	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	20	*/
	21
7582eb9b	22	#include <linux/platform_device.h>
9221fc65 JC	23	#include <linux/delay.h>
	24	#include <linux/spinlock.h>
	25	#include <linux/module.h>
ec66841e JC	26	#include <linux/via-core.h>
ec66841e JC	27	#include <linux/via_i2c.h>
9f291634	28
f045f77b JC	29	/*
	30	* There can only be one set of these, so there's no point in having
	31	* them be dynamically allocated...
	32	*/
	33	#define VIAFB_NUM_I2C 5
	34	static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
23e5abd5	35	static struct viafb_dev i2c_vdev; / Passed in from core */
f045f77b	36
9f291634 JC	37	static void via_i2c_setscl(void *data, int state)
	38	{
	39	u8 val;
f045f77b	40	struct via_port_cfg *adap_data = data;
75b035ac	41	unsigned long flags;
9f291634	42
75b035ac JC	43	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
75b035ac JC	44	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
9f291634 JC	45	if (state)
	46	val \|= 0x20;
	47	else
	48	val &= ~0x20;
277d32a3	49	switch (adap_data->type) {
f045f77b	50	case VIA_PORT_I2C:
9f291634 JC	51	val \|= 0x01;
9f291634 JC	52	break;
f045f77b	53	case VIA_PORT_GPIO:
2c4c8a8a	54	val \|= 0x82;
9f291634 JC	55	break;
9f291634 JC	56	default:
4a28ea9c	57	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
9f291634	58	}
75b035ac JC	59	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
75b035ac JC	60	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
9f291634 JC	61	}
	62
	63	static int via_i2c_getscl(void *data)
	64	{
f045f77b	65	struct via_port_cfg *adap_data = data;
75b035ac JC	66	unsigned long flags;
	67	int ret = 0;
	68
	69	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
2c4c8a8a FTS	70	if (adap_data->type == VIA_PORT_GPIO)
	71	via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
	72	0, 0x80);
75b035ac JC	73	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
	74	ret = 1;
	75	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	76	return ret;
9f291634 JC	77	}
	78
	79	static int via_i2c_getsda(void *data)
	80	{
f045f77b	81	struct via_port_cfg *adap_data = data;
75b035ac JC	82	unsigned long flags;
	83	int ret = 0;
	84
	85	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
2c4c8a8a FTS	86	if (adap_data->type == VIA_PORT_GPIO)
	87	via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
	88	0, 0x40);
75b035ac JC	89	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
	90	ret = 1;
	91	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	92	return ret;
9f291634 JC	93	}
	94
	95	static void via_i2c_setsda(void *data, int state)
	96	{
	97	u8 val;
f045f77b	98	struct via_port_cfg *adap_data = data;
75b035ac	99	unsigned long flags;
9f291634	100
75b035ac JC	101	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
75b035ac JC	102	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
9f291634 JC	103	if (state)
	104	val \|= 0x10;
	105	else
	106	val &= ~0x10;
277d32a3	107	switch (adap_data->type) {
f045f77b	108	case VIA_PORT_I2C:
9f291634 JC	109	val \|= 0x01;
9f291634 JC	110	break;
f045f77b	111	case VIA_PORT_GPIO:
2c4c8a8a	112	val \|= 0x42;
9f291634 JC	113	break;
9f291634 JC	114	default:
4a28ea9c	115	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
9f291634	116	}
75b035ac JC	117	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
75b035ac JC	118	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
9f291634 JC	119	}
9f291634 JC	120
277d32a3	121	int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
9f291634	122	{
85c5702a	123	int ret;
9f291634 JC	124	u8 mm1[] = {0x00};
	125	struct i2c_msg msgs[2];
	126
b052d7f8 JC	127	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	128	return -ENODEV;
9f291634 JC	129	*pdata = 0;
	130	msgs[0].flags = 0;
	131	msgs[1].flags = I2C_M_RD;
	132	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	133	mm1[0] = index;
	134	msgs[0].len = 1; msgs[1].len = 1;
	135	msgs[0].buf = mm1; msgs[1].buf = pdata;
85c5702a FTS	136	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	137	if (ret == 2)
	138	ret = 0;
	139	else if (ret >= 0)
	140	ret = -EIO;
	141
	142	return ret;
9f291634 JC	143	}
9f291634 JC	144
277d32a3	145	int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
9f291634	146	{
85c5702a	147	int ret;
9f291634 JC	148	u8 msg[2] = { index, data };
	149	struct i2c_msg msgs;
	150
b052d7f8 JC	151	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	152	return -ENODEV;
9f291634 JC	153	msgs.flags = 0;
	154	msgs.addr = slave_addr / 2;
	155	msgs.len = 2;
	156	msgs.buf = msg;
85c5702a FTS	157	ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
	158	if (ret == 1)
	159	ret = 0;
	160	else if (ret >= 0)
	161	ret = -EIO;
	162
	163	return ret;
9f291634 JC	164	}
9f291634 JC	165
277d32a3	166	int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
9f291634	167	{
85c5702a	168	int ret;
9f291634 JC	169	u8 mm1[] = {0x00};
	170	struct i2c_msg msgs[2];
	171
b052d7f8 JC	172	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	173	return -ENODEV;
9f291634 JC	174	msgs[0].flags = 0;
	175	msgs[1].flags = I2C_M_RD;
	176	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	177	mm1[0] = index;
	178	msgs[0].len = 1; msgs[1].len = buff_len;
	179	msgs[0].buf = mm1; msgs[1].buf = buff;
85c5702a FTS	180	ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
	181	if (ret == 2)
	182	ret = 0;
	183	else if (ret >= 0)
	184	ret = -EIO;
	185
	186	return ret;
9f291634 JC	187	}
9f291634 JC	188
b8f7e5d8 JC	189	/*
	190	* Allow other viafb subdevices to look up a specific adapter
	191	* by port name.
	192	*/
	193	struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
	194	{
	195	struct via_i2c_stuff *stuff = &via_i2c_par[which];
	196
	197	return &stuff->adapter;
	198	}
	199	EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
	200
	201
277d32a3 HW	202	static int create_i2c_bus(struct i2c_adapter *adapter,
277d32a3 HW	203	struct i2c_algo_bit_data *algo,
f045f77b	204	struct via_port_cfg *adap_cfg,
277d32a3	205	struct pci_dev *pdev)
9f291634	206	{
277d32a3 HW	207	algo->setsda = via_i2c_setsda;
	208	algo->setscl = via_i2c_setscl;
	209	algo->getsda = via_i2c_getsda;
	210	algo->getscl = via_i2c_getscl;
e029ab0d FTS	211	algo->udelay = 10;
e029ab0d FTS	212	algo->timeout = 2;
277d32a3 HW	213	algo->data = adap_cfg;
	214
	215	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
	216	adap_cfg->ioport_index);
	217	adapter->owner = THIS_MODULE;
277d32a3 HW	218	adapter->class = I2C_CLASS_DDC;
	219	adapter->algo_data = algo;
	220	if (pdev)
	221	adapter->dev.parent = &pdev->dev;
	222	else
	223	adapter->dev.parent = NULL;
	224	/* i2c_set_adapdata(adapter, adap_cfg); */
9f291634 JC	225
9f291634 JC	226	/* Raise SCL and SDA */
277d32a3 HW	227	via_i2c_setsda(adap_cfg, 1);
277d32a3 HW	228	via_i2c_setscl(adap_cfg, 1);
9f291634 JC	229	udelay(20);
9f291634 JC	230
277d32a3 HW	231	return i2c_bit_add_bus(adapter);
	232	}
	233
7582eb9b	234	static int viafb_i2c_probe(struct platform_device *platdev)
277d32a3 HW	235	{
277d32a3 HW	236	int i, ret;
7582eb9b JC	237	struct via_port_cfg *configs;
	238
	239	i2c_vdev = platdev->dev.platform_data;
	240	configs = i2c_vdev->port_cfg;
277d32a3	241
f045f77b JC	242	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	243	struct via_port_cfg *adap_cfg = configs++;
	244	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
277d32a3	245
b052d7f8	246	i2c_stuff->is_active = 0;
f045f77b	247	if (adap_cfg->type == 0 \|\| adap_cfg->mode != VIA_MODE_I2C)
4da62e6c	248	continue;
277d32a3 HW	249	ret = create_i2c_bus(&i2c_stuff->adapter,
	250	&i2c_stuff->algo, adap_cfg,
	251	NULL); /* FIXME: PCIDEV */
	252	if (ret < 0) {
	253	printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
	254	i, ret);
b052d7f8	255	continue; /* Still try to make the rest */
277d32a3	256	}
b052d7f8	257	i2c_stuff->is_active = 1;
277d32a3 HW	258	}
	259
	260	return 0;
9f291634 JC	261	}
9f291634 JC	262
7582eb9b	263	static int viafb_i2c_remove(struct platform_device *platdev)
9f291634	264	{
277d32a3 HW	265	int i;
277d32a3 HW	266
f045f77b JC	267	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	268	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
	269	/*
	270	* Only remove those entries in the array that we've
	271	* actually used (and thus initialized algo_data)
	272	*/
b052d7f8	273	if (i2c_stuff->is_active)
277d32a3 HW	274	i2c_del_adapter(&i2c_stuff->adapter);
277d32a3 HW	275	}
7582eb9b JC	276	return 0;
	277	}
	278
	279	static struct platform_driver via_i2c_driver = {
	280	.driver = {
	281	.name = "viafb-i2c",
	282	},
	283	.probe = viafb_i2c_probe,
	284	.remove = viafb_i2c_remove,
	285	};
	286
	287	int viafb_i2c_init(void)
	288	{
	289	return platform_driver_register(&via_i2c_driver);
	290	}
	291
	292	void viafb_i2c_exit(void)
	293	{
	294	platform_driver_unregister(&via_i2c_driver);
9f291634	295	}