[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 "via-core.h"
#include "via_i2c.h"
#include "global.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];
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 |= 0x80;
		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 (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 (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 |= 0x40;
		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)
{
	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;
	return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
}

int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
{
	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;
	return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
}

int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
{
	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;
	return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
}

/*
 * 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 = 40;
	algo->timeout = 20;
	algo->data = adap_cfg;

	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
		adap_cfg->ioport_index);
	adapter->owner = THIS_MODULE;
	adapter->id = 0x01FFFF;
	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>
24b4d82e JC	23	#include "via-core.h"
24b4d82e JC	24	#include "via_i2c.h"
9f291634 JC	25	#include "global.h"
9f291634 JC	26
f045f77b JC	27	/*
	28	* There can only be one set of these, so there's no point in having
	29	* them be dynamically allocated...
	30	*/
	31	#define VIAFB_NUM_I2C 5
	32	static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
75b035ac	33	struct viafb_dev i2c_vdev; / Passed in from core */
f045f77b	34
9f291634 JC	35	static void via_i2c_setscl(void *data, int state)
	36	{
	37	u8 val;
f045f77b	38	struct via_port_cfg *adap_data = data;
75b035ac	39	unsigned long flags;
9f291634	40
75b035ac JC	41	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
75b035ac JC	42	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
9f291634 JC	43	if (state)
	44	val \|= 0x20;
	45	else
	46	val &= ~0x20;
277d32a3	47	switch (adap_data->type) {
f045f77b	48	case VIA_PORT_I2C:
9f291634 JC	49	val \|= 0x01;
9f291634 JC	50	break;
f045f77b	51	case VIA_PORT_GPIO:
9f291634 JC	52	val \|= 0x80;
	53	break;
	54	default:
4a28ea9c	55	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
9f291634	56	}
75b035ac JC	57	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
75b035ac JC	58	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
9f291634 JC	59	}
	60
	61	static int via_i2c_getscl(void *data)
	62	{
f045f77b	63	struct via_port_cfg *adap_data = data;
75b035ac JC	64	unsigned long flags;
	65	int ret = 0;
	66
	67	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	68	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
	69	ret = 1;
	70	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	71	return ret;
9f291634 JC	72	}
	73
	74	static int via_i2c_getsda(void *data)
	75	{
f045f77b	76	struct via_port_cfg *adap_data = data;
75b035ac JC	77	unsigned long flags;
	78	int ret = 0;
	79
	80	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
	81	if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
	82	ret = 1;
	83	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
	84	return ret;
9f291634 JC	85	}
	86
	87	static void via_i2c_setsda(void *data, int state)
	88	{
	89	u8 val;
f045f77b	90	struct via_port_cfg *adap_data = data;
75b035ac	91	unsigned long flags;
9f291634	92
75b035ac JC	93	spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
75b035ac JC	94	val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
9f291634 JC	95	if (state)
	96	val \|= 0x10;
	97	else
	98	val &= ~0x10;
277d32a3	99	switch (adap_data->type) {
f045f77b	100	case VIA_PORT_I2C:
9f291634 JC	101	val \|= 0x01;
9f291634 JC	102	break;
f045f77b	103	case VIA_PORT_GPIO:
9f291634 JC	104	val \|= 0x40;
	105	break;
	106	default:
4a28ea9c	107	printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
9f291634	108	}
75b035ac JC	109	via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
75b035ac JC	110	spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
9f291634 JC	111	}
9f291634 JC	112
277d32a3	113	int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
9f291634 JC	114	{
	115	u8 mm1[] = {0x00};
	116	struct i2c_msg msgs[2];
	117
b052d7f8 JC	118	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	119	return -ENODEV;
9f291634 JC	120	*pdata = 0;
	121	msgs[0].flags = 0;
	122	msgs[1].flags = I2C_M_RD;
	123	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	124	mm1[0] = index;
	125	msgs[0].len = 1; msgs[1].len = 1;
	126	msgs[0].buf = mm1; msgs[1].buf = pdata;
f045f77b	127	return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
9f291634 JC	128	}
9f291634 JC	129
277d32a3	130	int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
9f291634 JC	131	{
	132	u8 msg[2] = { index, data };
	133	struct i2c_msg msgs;
	134
b052d7f8 JC	135	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	136	return -ENODEV;
9f291634 JC	137	msgs.flags = 0;
	138	msgs.addr = slave_addr / 2;
	139	msgs.len = 2;
	140	msgs.buf = msg;
f045f77b	141	return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
9f291634 JC	142	}
9f291634 JC	143
277d32a3	144	int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
9f291634 JC	145	{
	146	u8 mm1[] = {0x00};
	147	struct i2c_msg msgs[2];
	148
b052d7f8 JC	149	if (!via_i2c_par[adap].is_active)
b052d7f8 JC	150	return -ENODEV;
9f291634 JC	151	msgs[0].flags = 0;
	152	msgs[1].flags = I2C_M_RD;
	153	msgs[0].addr = msgs[1].addr = slave_addr / 2;
	154	mm1[0] = index;
	155	msgs[0].len = 1; msgs[1].len = buff_len;
	156	msgs[0].buf = mm1; msgs[1].buf = buff;
f045f77b	157	return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
9f291634 JC	158	}
9f291634 JC	159
b8f7e5d8 JC	160	/*
	161	* Allow other viafb subdevices to look up a specific adapter
	162	* by port name.
	163	*/
	164	struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
	165	{
	166	struct via_i2c_stuff *stuff = &via_i2c_par[which];
	167
	168	return &stuff->adapter;
	169	}
	170	EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
	171
	172
277d32a3 HW	173	static int create_i2c_bus(struct i2c_adapter *adapter,
277d32a3 HW	174	struct i2c_algo_bit_data *algo,
f045f77b	175	struct via_port_cfg *adap_cfg,
277d32a3	176	struct pci_dev *pdev)
9f291634	177	{
277d32a3 HW	178	algo->setsda = via_i2c_setsda;
	179	algo->setscl = via_i2c_setscl;
	180	algo->getsda = via_i2c_getsda;
	181	algo->getscl = via_i2c_getscl;
	182	algo->udelay = 40;
	183	algo->timeout = 20;
	184	algo->data = adap_cfg;
	185
	186	sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
	187	adap_cfg->ioport_index);
	188	adapter->owner = THIS_MODULE;
	189	adapter->id = 0x01FFFF;
	190	adapter->class = I2C_CLASS_DDC;
	191	adapter->algo_data = algo;
	192	if (pdev)
	193	adapter->dev.parent = &pdev->dev;
	194	else
	195	adapter->dev.parent = NULL;
	196	/* i2c_set_adapdata(adapter, adap_cfg); */
9f291634 JC	197
9f291634 JC	198	/* Raise SCL and SDA */
277d32a3 HW	199	via_i2c_setsda(adap_cfg, 1);
277d32a3 HW	200	via_i2c_setscl(adap_cfg, 1);
9f291634 JC	201	udelay(20);
9f291634 JC	202
277d32a3 HW	203	return i2c_bit_add_bus(adapter);
	204	}
	205
7582eb9b	206	static int viafb_i2c_probe(struct platform_device *platdev)
277d32a3 HW	207	{
277d32a3 HW	208	int i, ret;
7582eb9b JC	209	struct via_port_cfg *configs;
	210
	211	i2c_vdev = platdev->dev.platform_data;
	212	configs = i2c_vdev->port_cfg;
277d32a3	213
f045f77b JC	214	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	215	struct via_port_cfg *adap_cfg = configs++;
	216	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
277d32a3	217
b052d7f8	218	i2c_stuff->is_active = 0;
f045f77b	219	if (adap_cfg->type == 0 \|\| adap_cfg->mode != VIA_MODE_I2C)
4da62e6c	220	continue;
277d32a3 HW	221	ret = create_i2c_bus(&i2c_stuff->adapter,
	222	&i2c_stuff->algo, adap_cfg,
	223	NULL); /* FIXME: PCIDEV */
	224	if (ret < 0) {
	225	printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
	226	i, ret);
b052d7f8	227	continue; /* Still try to make the rest */
277d32a3	228	}
b052d7f8	229	i2c_stuff->is_active = 1;
277d32a3 HW	230	}
	231
	232	return 0;
9f291634 JC	233	}
9f291634 JC	234
7582eb9b	235	static int viafb_i2c_remove(struct platform_device *platdev)
9f291634	236	{
277d32a3 HW	237	int i;
277d32a3 HW	238
f045f77b JC	239	for (i = 0; i < VIAFB_NUM_PORTS; i++) {
	240	struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
	241	/*
	242	* Only remove those entries in the array that we've
	243	* actually used (and thus initialized algo_data)
	244	*/
b052d7f8	245	if (i2c_stuff->is_active)
277d32a3 HW	246	i2c_del_adapter(&i2c_stuff->adapter);
277d32a3 HW	247	}
7582eb9b JC	248	return 0;
	249	}
	250
	251	static struct platform_driver via_i2c_driver = {
	252	.driver = {
	253	.name = "viafb-i2c",
	254	},
	255	.probe = viafb_i2c_probe,
	256	.remove = viafb_i2c_remove,
	257	};
	258
	259	int viafb_i2c_init(void)
	260	{
	261	return platform_driver_register(&via_i2c_driver);
	262	}
	263
	264	void viafb_i2c_exit(void)
	265	{
	266	platform_driver_unregister(&via_i2c_driver);
9f291634	267	}