[deliverable/linux.git] / drivers / staging / media / go7007 / go7007-i2c.c

/*
 * Copyright (C) 2005-2006 Micronas USA Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (Version 2) as
 * published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/unistd.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>

#include "go7007-priv.h"

/********************* Driver for on-board I2C adapter *********************/

/* #define GO7007_I2C_DEBUG */

#define SPI_I2C_ADDR_BASE		0x1400
#define STATUS_REG_ADDR			(SPI_I2C_ADDR_BASE + 0x2)
#define I2C_CTRL_REG_ADDR		(SPI_I2C_ADDR_BASE + 0x6)
#define I2C_DEV_UP_ADDR_REG_ADDR	(SPI_I2C_ADDR_BASE + 0x7)
#define I2C_LO_ADDR_REG_ADDR		(SPI_I2C_ADDR_BASE + 0x8)
#define I2C_DATA_REG_ADDR		(SPI_I2C_ADDR_BASE + 0x9)
#define I2C_CLKFREQ_REG_ADDR		(SPI_I2C_ADDR_BASE + 0xa)

#define I2C_STATE_MASK			0x0007
#define I2C_READ_READY_MASK		0x0008

/* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
 * on the Adlink PCI-MPG24, so access is shared between all of them. */
static DEFINE_MUTEX(adlink_mpg24_i2c_lock);

static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
		u16 command, int flags, u8 *data)
{
	int i, ret = -EIO;
	u16 val;

	if (go->status == STATUS_SHUTDOWN)
		return -ENODEV;

#ifdef GO7007_I2C_DEBUG
	if (read)
		dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
			command, addr);
	else
		dev_dbg(go->dev,
			"go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
			*data, command, addr);
#endif

	mutex_lock(&go->hw_lock);

	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
		/* Bridge the I2C port on this GO7007 to the shared bus */
		mutex_lock(&adlink_mpg24_i2c_lock);
		go7007_write_addr(go, 0x3c82, 0x0020);
	}

	/* Wait for I2C adapter to be ready */
	for (i = 0; i < 10; ++i) {
		if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
			goto i2c_done;
		if (!(val & I2C_STATE_MASK))
			break;
		msleep(100);
	}
	if (i == 10) {
		dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
		goto i2c_done;
	}

	/* Set target register (command) */
	go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
	go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);

	/* If we're writing, send the data and target address and we're done */
	if (!read) {
		go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
		go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
					(addr << 9) | (command >> 8));
		ret = 0;
		goto i2c_done;
	}

	/* Otherwise, we're reading.  First clear i2c_rx_data_rdy. */
	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
		goto i2c_done;

	/* Send the target address plus read flag */
	go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
			(addr << 9) | 0x0100 | (command >> 8));

	/* Wait for i2c_rx_data_rdy */
	for (i = 0; i < 10; ++i) {
		if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
			goto i2c_done;
		if (val & I2C_READ_READY_MASK)
			break;
		msleep(100);
	}
	if (i == 10) {
		dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
		goto i2c_done;
	}

	/* Retrieve the read byte */
	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
		goto i2c_done;
	*data = val;
	ret = 0;

i2c_done:
	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
		/* Isolate the I2C port on this GO7007 from the shared bus */
		go7007_write_addr(go, 0x3c82, 0x0000);
		mutex_unlock(&adlink_mpg24_i2c_lock);
	}
	mutex_unlock(&go->hw_lock);
	return ret;
}

static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
		unsigned short flags, char read_write,
		u8 command, int size, union i2c_smbus_data *data)
{
	struct go7007 *go = i2c_get_adapdata(adapter);

	if (size != I2C_SMBUS_BYTE_DATA)
		return -EIO;
	return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
			flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
}

/* VERY LIMITED I2C master xfer function -- only needed because the
 * SMBus functions only support 8-bit commands and the SAA7135 uses
 * 16-bit commands.  The I2C interface on the GO7007, as limited as
 * it is, does support this mode. */

static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
					struct i2c_msg msgs[], int num)
{
	struct go7007 *go = i2c_get_adapdata(adapter);
	int i;

	for (i = 0; i < num; ++i) {
		/* We can only do two things here -- write three bytes, or
		 * write two bytes and read one byte. */
		if (msgs[i].len == 2) {
			if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
					(msgs[i].flags & I2C_M_RD) ||
					!(msgs[i + 1].flags & I2C_M_RD) ||
					msgs[i + 1].len != 1)
				return -EIO;
			if (go7007_i2c_xfer(go, msgs[i].addr, 1,
					(msgs[i].buf[0] << 8) | msgs[i].buf[1],
					0x01, &msgs[i + 1].buf[0]) < 0)
				return -EIO;
			++i;
		} else if (msgs[i].len == 3) {
			if (msgs[i].flags & I2C_M_RD)
				return -EIO;
			if (msgs[i].len != 3)
				return -EIO;
			if (go7007_i2c_xfer(go, msgs[i].addr, 0,
					(msgs[i].buf[0] << 8) | msgs[i].buf[1],
					0x01, &msgs[i].buf[2]) < 0)
				return -EIO;
		} else
			return -EIO;
	}

	return num;
}

static u32 go7007_functionality(struct i2c_adapter *adapter)
{
	return I2C_FUNC_SMBUS_BYTE_DATA;
}

static struct i2c_algorithm go7007_algo = {
	.smbus_xfer	= go7007_smbus_xfer,
	.master_xfer	= go7007_i2c_master_xfer,
	.functionality	= go7007_functionality,
};

static struct i2c_adapter go7007_adap_templ = {
	.owner			= THIS_MODULE,
	.name			= "WIS GO7007SB",
	.algo			= &go7007_algo,
};

int go7007_i2c_init(struct go7007 *go)
{
	memcpy(&go->i2c_adapter, &go7007_adap_templ,
			sizeof(go7007_adap_templ));
	go->i2c_adapter.dev.parent = go->dev;
	i2c_set_adapdata(&go->i2c_adapter, go);
	if (i2c_add_adapter(&go->i2c_adapter) < 0) {
		dev_err(go->dev,
			"go7007-i2c: error: i2c_add_adapter failed\n");
		return -1;
	}
	return 0;
}
Commit	Line	Data
866b8695 GKH	1	/*
	2	* Copyright (C) 2005-2006 Micronas USA Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License (Version 2) as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software Foundation,
	15	* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	16	*/
	17
866b8695	18	#include <linux/module.h>
866b8695 GKH	19	#include <linux/delay.h>
	20	#include <linux/sched.h>
	21	#include <linux/list.h>
	22	#include <linux/unistd.h>
	23	#include <linux/time.h>
	24	#include <linux/device.h>
	25	#include <linux/i2c.h>
fd9a40da	26	#include <linux/mutex.h>
866b8695	27	#include <linux/uaccess.h>
866b8695 GKH	28
866b8695 GKH	29	#include "go7007-priv.h"
866b8695	30
866b8695 GKH	31	/******************* Driver for on-board I2C adapter *******************/
	32
	33	/* #define GO7007_I2C_DEBUG */
	34
	35	#define SPI_I2C_ADDR_BASE 0x1400
	36	#define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2)
	37	#define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6)
	38	#define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7)
	39	#define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8)
	40	#define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9)
	41	#define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa)
	42
	43	#define I2C_STATE_MASK 0x0007
	44	#define I2C_READ_READY_MASK 0x0008
	45
	46	/* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
	47	* on the Adlink PCI-MPG24, so access is shared between all of them. */
fd9a40da	48	static DEFINE_MUTEX(adlink_mpg24_i2c_lock);
866b8695 GKH	49
	50	static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
	51	u16 command, int flags, u8 *data)
	52	{
ffb97493	53	int i, ret = -EIO;
866b8695 GKH	54	u16 val;
	55
	56	if (go->status == STATUS_SHUTDOWN)
ffb97493	57	return -ENODEV;
866b8695 GKH	58
	59	#ifdef GO7007_I2C_DEBUG
	60	if (read)
afc2e8a0	61	dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
866b8695 GKH	62	command, addr);
866b8695 GKH	63	else
afc2e8a0	64	dev_dbg(go->dev,
866b8695 GKH	65	"go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
	66	*data, command, addr);
	67	#endif
	68
fd9a40da	69	mutex_lock(&go->hw_lock);
866b8695 GKH	70
	71	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
	72	/* Bridge the I2C port on this GO7007 to the shared bus */
fd9a40da	73	mutex_lock(&adlink_mpg24_i2c_lock);
866b8695 GKH	74	go7007_write_addr(go, 0x3c82, 0x0020);
	75	}
	76
	77	/* Wait for I2C adapter to be ready */
	78	for (i = 0; i < 10; ++i) {
	79	if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
	80	goto i2c_done;
	81	if (!(val & I2C_STATE_MASK))
	82	break;
	83	msleep(100);
	84	}
	85	if (i == 10) {
afc2e8a0	86	dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
866b8695 GKH	87	goto i2c_done;
	88	}
	89
	90	/* Set target register (command) */
	91	go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
	92	go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
	93
	94	/* If we're writing, send the data and target address and we're done */
	95	if (!read) {
	96	go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
	97	go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
	98	(addr << 9) \| (command >> 8));
	99	ret = 0;
	100	goto i2c_done;
	101	}
	102
	103	/* Otherwise, we're reading. First clear i2c_rx_data_rdy. */
	104	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
	105	goto i2c_done;
	106
	107	/* Send the target address plus read flag */
	108	go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
	109	(addr << 9) \| 0x0100 \| (command >> 8));
	110
	111	/* Wait for i2c_rx_data_rdy */
	112	for (i = 0; i < 10; ++i) {
	113	if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
	114	goto i2c_done;
	115	if (val & I2C_READ_READY_MASK)
	116	break;
	117	msleep(100);
	118	}
	119	if (i == 10) {
afc2e8a0	120	dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
866b8695 GKH	121	goto i2c_done;
	122	}
	123
	124	/* Retrieve the read byte */
	125	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
	126	goto i2c_done;
	127	*data = val;
	128	ret = 0;
	129
	130	i2c_done:
	131	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
	132	/* Isolate the I2C port on this GO7007 from the shared bus */
	133	go7007_write_addr(go, 0x3c82, 0x0000);
fd9a40da	134	mutex_unlock(&adlink_mpg24_i2c_lock);
866b8695	135	}
fd9a40da	136	mutex_unlock(&go->hw_lock);
866b8695 GKH	137	return ret;
	138	}
	139
	140	static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
	141	unsigned short flags, char read_write,
	142	u8 command, int size, union i2c_smbus_data *data)
	143	{
	144	struct go7007 *go = i2c_get_adapdata(adapter);
	145
	146	if (size != I2C_SMBUS_BYTE_DATA)
ffb97493	147	return -EIO;
866b8695 GKH	148	return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
	149	flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
	150	}
	151
	152	/* VERY LIMITED I2C master xfer function -- only needed because the
	153	* SMBus functions only support 8-bit commands and the SAA7135 uses
	154	* 16-bit commands. The I2C interface on the GO7007, as limited as
	155	* it is, does support this mode. */
	156
	157	static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
	158	struct i2c_msg msgs[], int num)
	159	{
	160	struct go7007 *go = i2c_get_adapdata(adapter);
	161	int i;
	162
	163	for (i = 0; i < num; ++i) {
	164	/* We can only do two things here -- write three bytes, or
	165	* write two bytes and read one byte. */
	166	if (msgs[i].len == 2) {
	167	if (i + 1 == num \|\| msgs[i].addr != msgs[i + 1].addr \|\|
	168	(msgs[i].flags & I2C_M_RD) \|\|
	169	!(msgs[i + 1].flags & I2C_M_RD) \|\|
	170	msgs[i + 1].len != 1)
ffb97493	171	return -EIO;
866b8695 GKH	172	if (go7007_i2c_xfer(go, msgs[i].addr, 1,
	173	(msgs[i].buf[0] << 8) \| msgs[i].buf[1],
	174	0x01, &msgs[i + 1].buf[0]) < 0)
ffb97493	175	return -EIO;
866b8695 GKH	176	++i;
	177	} else if (msgs[i].len == 3) {
	178	if (msgs[i].flags & I2C_M_RD)
ffb97493	179	return -EIO;
866b8695	180	if (msgs[i].len != 3)
ffb97493	181	return -EIO;
866b8695 GKH	182	if (go7007_i2c_xfer(go, msgs[i].addr, 0,
	183	(msgs[i].buf[0] << 8) \| msgs[i].buf[1],
	184	0x01, &msgs[i].buf[2]) < 0)
ffb97493	185	return -EIO;
866b8695	186	} else
ffb97493	187	return -EIO;
866b8695 GKH	188	}
866b8695 GKH	189
ffb97493	190	return num;
866b8695 GKH	191	}
	192
	193	static u32 go7007_functionality(struct i2c_adapter *adapter)
	194	{
	195	return I2C_FUNC_SMBUS_BYTE_DATA;
	196	}
	197
	198	static struct i2c_algorithm go7007_algo = {
	199	.smbus_xfer = go7007_smbus_xfer,
	200	.master_xfer = go7007_i2c_master_xfer,
	201	.functionality = go7007_functionality,
	202	};
	203
	204	static struct i2c_adapter go7007_adap_templ = {
	205	.owner = THIS_MODULE,
866b8695	206	.name = "WIS GO7007SB",
866b8695 GKH	207	.algo = &go7007_algo,
	208	};
	209
	210	int go7007_i2c_init(struct go7007 *go)
	211	{
	212	memcpy(&go->i2c_adapter, &go7007_adap_templ,
	213	sizeof(go7007_adap_templ));
	214	go->i2c_adapter.dev.parent = go->dev;
	215	i2c_set_adapdata(&go->i2c_adapter, go);
	216	if (i2c_add_adapter(&go->i2c_adapter) < 0) {
afc2e8a0	217	dev_err(go->dev,
866b8695 GKH	218	"go7007-i2c: error: i2c_add_adapter failed\n");
	219	return -1;
	220	}
	221	return 0;
	222	}