[net-next-2.6.git] / drivers / media / video / cx231xx / cx231xx-i2c.c

/*
   cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices

   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
		Based on em28xx driver
		Based on Cx23885 driver

   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/usb.h>
#include <linux/i2c.h>
#include <media/v4l2-common.h>
#include <media/tuner.h>

#include "cx231xx.h"

/* ----------------------------------------------------------- */

static unsigned int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");

static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

#define dprintk1(lvl, fmt, args...)			\
do {							\
	if (i2c_debug >= lvl) {				\
		printk(fmt, ##args);			\
		}					\
} while (0)

#define dprintk2(lvl, fmt, args...)			\
do {							\
	if (i2c_debug >= lvl) {				\
		printk(KERN_DEBUG "%s at %s: " fmt,	\
		       dev->name, __func__ , ##args);	\
      } 						\
} while (0)

/*
 * cx231xx_i2c_send_bytes()
 */
int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
			   const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 size = 0;
	u8 loop = 0;
	u8 saddr_len = 1;
	u8 *buf_ptr = NULL;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if ((bus->nr == 1) && (msg->addr == 0x61)
	    && (dev->tuner_type == TUNER_XC5000)) {

		size = msg->len;

		if (size == 2) {	/* register write sub addr */
			/* Just writing sub address will cause problem
			* to XC5000. So ignore the request */
			return 0;
		} else if (size == 4) {	/* register write with sub addr */
			if (msg->len >= 2)
				saddr = msg->buf[0] << 8 | msg->buf[1];
			else if (msg->len == 1)
				saddr = msg->buf[0];

			switch (saddr) {
			case 0x0000:	/* start tuner calibration mode */
				need_gpio = 1;
				/* FW Loading is done */
				dev->xc_fw_load_done = 1;
				break;
			case 0x000D:	/* Set signal source */
			case 0x0001:	/* Set TV standard - Video */
			case 0x0002:	/* Set TV standard - Audio */
			case 0x0003:	/* Set RF Frequency */
				need_gpio = 1;
				break;
			default:
				if (dev->xc_fw_load_done)
					need_gpio = 1;
				break;
			}

			if (need_gpio) {
				dprintk1(1,
				"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
				msg->addr, msg->len, saddr);

				return dev->cx231xx_gpio_i2c_write(dev,
								   msg->addr,
								   msg->buf,
								   msg->len);
			}
		}

		/* special case for Xc5000 tuner case */
		saddr_len = 1;

		/* adjust the length to correct length */
		size -= saddr_len;
		buf_ptr = (u8 *) (msg->buf + 1);

		do {
			/* prepare xfer_data struct */
			req_data.dev_addr = msg->addr;
			req_data.direction = msg->flags;
			req_data.saddr_len = saddr_len;
			req_data.saddr_dat = msg->buf[0];
			req_data.buf_size = size > 16 ? 16 : size;
			req_data.p_buffer = (u8 *) (buf_ptr + loop * 16);

			bus->i2c_nostop = (size > 16) ? 1 : 0;
			bus->i2c_reserve = (loop == 0) ? 0 : 1;

			/* usb send command */
			status = dev->cx231xx_send_usb_command(bus, &req_data);
			loop++;

			if (size >= 16)
				size -= 16;
			else
				size = 0;

		} while (size > 0);

		bus->i2c_nostop = 0;
		bus->i2c_reserve = 0;

	} else {		/* regular case */

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = 0;
		req_data.saddr_dat = 0;
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);
	}

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_recv_bytes()
 * read a byte from the i2c device
 */
static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
				  const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if ((bus->nr == 1) && (msg->addr == 0x61)
	    && dev->tuner_type == TUNER_XC5000) {

		if (msg->len == 2)
			saddr = msg->buf[0] << 8 | msg->buf[1];
		else if (msg->len == 1)
			saddr = msg->buf[0];

		if (dev->xc_fw_load_done) {

			switch (saddr) {
			case 0x0009:	/* BUSY check */
				dprintk1(1,
				"GPIO R E A D: Special case BUSY check \n");
				/*Try read BUSY register, just set it to zero*/
				msg->buf[0] = 0;
				if (msg->len == 2)
					msg->buf[1] = 0;
				return 0;
			case 0x0004:	/* read Lock status */
				need_gpio = 1;
				break;

			}

			if (need_gpio) {
				/* this is a special case to handle Xceive tuner
				clock stretch issue with gpio based I2C */

				dprintk1(1,
				"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
				msg->addr, msg->len,
				msg->buf[0] << 8 | msg->buf[1]);

				status =
				    dev->cx231xx_gpio_i2c_write(dev, msg->addr,
								msg->buf,
								msg->len);
				status =
				    dev->cx231xx_gpio_i2c_read(dev, msg->addr,
							       msg->buf,
							       msg->len);
				return status;
			}
		}

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = msg->len;
		req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1];
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);

	} else {

		/* prepare xfer_data struct */
		req_data.dev_addr = msg->addr;
		req_data.direction = msg->flags;
		req_data.saddr_len = 0;
		req_data.saddr_dat = 0;
		req_data.buf_size = msg->len;
		req_data.p_buffer = msg->buf;

		/* usb send command */
		status = dev->cx231xx_send_usb_command(bus, &req_data);
	}

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_recv_bytes_with_saddr()
 * read a byte from the i2c device
 */
static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
					     const struct i2c_msg *msg1,
					     const struct i2c_msg *msg2)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;
	u16 saddr = 0;
	u8 need_gpio = 0;

	if (msg1->len == 2)
		saddr = msg1->buf[0] << 8 | msg1->buf[1];
	else if (msg1->len == 1)
		saddr = msg1->buf[0];

	if ((bus->nr == 1) && (msg2->addr == 0x61)
	    && dev->tuner_type == TUNER_XC5000) {

		if ((msg2->len < 16)) {

			dprintk1(1,
			"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
			msg2->addr, msg2->len, saddr, msg1->len);

			switch (saddr) {
			case 0x0008:	/* read FW load status */
				need_gpio = 1;
				break;
			case 0x0004:	/* read Lock status */
				need_gpio = 1;
				break;
			}

			if (need_gpio) {
				status =
				    dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
								msg1->buf,
								msg1->len);
				status =
				    dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
							       msg2->buf,
							       msg2->len);
				return status;
			}
		}
	}

	/* prepare xfer_data struct */
	req_data.dev_addr = msg2->addr;
	req_data.direction = msg2->flags;
	req_data.saddr_len = msg1->len;
	req_data.saddr_dat = saddr;
	req_data.buf_size = msg2->len;
	req_data.p_buffer = msg2->buf;

	/* usb send command */
	status = dev->cx231xx_send_usb_command(bus, &req_data);

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_check_for_device()
 * check if there is a i2c_device at the supplied address
 */
static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
					const struct i2c_msg *msg)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	struct cx231xx_i2c_xfer_data req_data;
	int status = 0;

	/* prepare xfer_data struct */
	req_data.dev_addr = msg->addr;
	req_data.direction = msg->flags;
	req_data.saddr_len = 0;
	req_data.saddr_dat = 0;
	req_data.buf_size = 0;
	req_data.p_buffer = NULL;

	/* usb send command */
	status = dev->cx231xx_send_usb_command(bus, &req_data);

	return status < 0 ? status : 0;
}

/*
 * cx231xx_i2c_xfer()
 * the main i2c transfer function
 */
static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
			    struct i2c_msg msgs[], int num)
{
	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	struct cx231xx *dev = bus->dev;
	int addr, rc, i, byte;

	if (num <= 0)
		return 0;
	mutex_lock(&dev->i2c_lock);
	for (i = 0; i < num; i++) {

		addr = msgs[i].addr >> 1;

		dprintk2(2, "%s %s addr=%x len=%d:",
			 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
			 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
		if (!msgs[i].len) {
			/* no len: check only for device presence */
			rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
			if (rc < 0) {
				dprintk2(2, " no device\n");
				mutex_unlock(&dev->i2c_lock);
				return rc;
			}

		} else if (msgs[i].flags & I2C_M_RD) {
			/* read bytes */
			rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(" %02x", msgs[i].buf[byte]);
			}
		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
			   msgs[i].addr == msgs[i + 1].addr
			   && (msgs[i].len <= 2) && (bus->nr < 3)) {
			/* read bytes */
			rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
							       &msgs[i],
							       &msgs[i + 1]);
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(" %02x", msgs[i].buf[byte]);
			}
			i++;
		} else {
			/* write bytes */
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(" %02x", msgs[i].buf[byte]);
			}
			rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
		}
		if (rc < 0)
			goto err;
		if (i2c_debug >= 2)
			printk("\n");
	}
	mutex_unlock(&dev->i2c_lock);
	return num;
err:
	dprintk2(2, " ERROR: %i\n", rc);
	mutex_unlock(&dev->i2c_lock);
	return rc;
}

/* ----------------------------------------------------------- */

/*
 * functionality()
 */
static u32 functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
}

static struct i2c_algorithm cx231xx_algo = {
	.master_xfer = cx231xx_i2c_xfer,
	.functionality = functionality,
};

static struct i2c_adapter cx231xx_adap_template = {
	.owner = THIS_MODULE,
	.name = "cx231xx",
	.algo = &cx231xx_algo,
};

static struct i2c_client cx231xx_client_template = {
	.name = "cx231xx internal",
};

/* ----------------------------------------------------------- */

/*
 * i2c_devs
 * incomplete list of known devices
 */
static char *i2c_devs[128] = {
	[0x60 >> 1] = "colibri",
	[0x88 >> 1] = "hammerhead",
	[0x8e >> 1] = "CIR",
	[0x32 >> 1] = "GeminiIII",
	[0x02 >> 1] = "Aquarius",
	[0xa0 >> 1] = "eeprom",
	[0xc0 >> 1] = "tuner/XC3028",
	[0xc2 >> 1] = "tuner/XC5000",
};

/*
 * cx231xx_do_i2c_scan()
 * check i2c address range for devices
 */
void cx231xx_do_i2c_scan(struct cx231xx *dev, struct i2c_client *c)
{
	unsigned char buf;
	int i, rc;

	cx231xx_info(": Checking for I2C devices ..\n");
	for (i = 0; i < 128; i++) {
		c->addr = i;
		rc = i2c_master_recv(c, &buf, 0);
		if (rc < 0)
			continue;
		cx231xx_info("%s: i2c scan: found device @ 0x%x  [%s]\n",
			     dev->name, i << 1,
			     i2c_devs[i] ? i2c_devs[i] : "???");
	}
	cx231xx_info(": Completed Checking for I2C devices.\n");
}

/*
 * cx231xx_i2c_register()
 * register i2c bus
 */
int cx231xx_i2c_register(struct cx231xx_i2c *bus)
{
	struct cx231xx *dev = bus->dev;

	BUG_ON(!dev->cx231xx_send_usb_command);

	memcpy(&bus->i2c_adap, &cx231xx_adap_template, sizeof(bus->i2c_adap));
	memcpy(&bus->i2c_algo, &cx231xx_algo, sizeof(bus->i2c_algo));
	memcpy(&bus->i2c_client, &cx231xx_client_template,
	       sizeof(bus->i2c_client));

	bus->i2c_adap.dev.parent = &dev->udev->dev;

	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));

	bus->i2c_algo.data = bus;
	bus->i2c_adap.algo_data = bus;
	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
	i2c_add_adapter(&bus->i2c_adap);

	bus->i2c_client.adapter = &bus->i2c_adap;

	if (0 == bus->i2c_rc) {
		if (i2c_scan)
			cx231xx_do_i2c_scan(dev, &bus->i2c_client);
	} else
		cx231xx_warn("%s: i2c bus %d register FAILED\n",
			     dev->name, bus->nr);

	return bus->i2c_rc;
}

/*
 * cx231xx_i2c_unregister()
 * unregister i2c_bus
 */
int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
{
	i2c_del_adapter(&bus->i2c_adap);
	return 0;
}
Commit	Line	Data
e0d3bafd SD	1	/*
	2	cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices
	3
	4	Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
b9255176 SD	5	Based on em28xx driver
b9255176 SD	6	Based on Cx23885 driver
e0d3bafd SD	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/kernel.h>
	25	#include <linux/usb.h>
	26	#include <linux/i2c.h>
	27	#include <media/v4l2-common.h>
	28	#include <media/tuner.h>
	29
	30	#include "cx231xx.h"
	31
e0d3bafd SD	32	/* ----------------------------------------------------------- */
	33
	34	static unsigned int i2c_scan;
	35	module_param(i2c_scan, int, 0444);
	36	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	37
	38	static unsigned int i2c_debug;
	39	module_param(i2c_debug, int, 0644);
	40	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	41
e0d3bafd SD	42	#define dprintk1(lvl, fmt, args...) \
	43	do { \
	44	if (i2c_debug >= lvl) { \
6e4f574b SD	45	printk(fmt, ##args); \
6e4f574b SD	46	} \
e0d3bafd SD	47	} while (0)
	48
	49	#define dprintk2(lvl, fmt, args...) \
	50	do { \
	51	if (i2c_debug >= lvl) { \
	52	printk(KERN_DEBUG "%s at %s: " fmt, \
	53	dev->name, __func__ , ##args); \
	54	} \
	55	} while (0)
	56
e0d3bafd SD	57	/*
	58	* cx231xx_i2c_send_bytes()
	59	*/
	60	int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	61	const struct i2c_msg *msg)
e0d3bafd SD	62	{
	63	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	64	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	65	struct cx231xx_i2c_xfer_data req_data;
	66	int status = 0;
	67	u16 size = 0;
	68	u8 loop = 0;
	69	u8 saddr_len = 1;
	70	u8 *buf_ptr = NULL;
	71	u16 saddr = 0;
	72	u8 need_gpio = 0;
	73
	74	if ((bus->nr == 1) && (msg->addr == 0x61)
	75	&& (dev->tuner_type == TUNER_XC5000)) {
	76
	77	size = msg->len;
	78
	79	if (size == 2) { /* register write sub addr */
6e4f574b SD	80	/* Just writing sub address will cause problem
6e4f574b SD	81	* to XC5000. So ignore the request */
84b5dbf3	82	return 0;
84b5dbf3	83	} else if (size == 4) { /* register write with sub addr */
84b5dbf3 MCC	84	if (msg->len >= 2)
	85	saddr = msg->buf[0] << 8 \| msg->buf[1];
	86	else if (msg->len == 1)
	87	saddr = msg->buf[0];
	88
	89	switch (saddr) {
	90	case 0x0000: /* start tuner calibration mode */
	91	need_gpio = 1;
b9255176 SD	92	/* FW Loading is done */
b9255176 SD	93	dev->xc_fw_load_done = 1;
84b5dbf3 MCC	94	break;
	95	case 0x000D: /* Set signal source */
	96	case 0x0001: /* Set TV standard - Video */
	97	case 0x0002: /* Set TV standard - Audio */
	98	case 0x0003: /* Set RF Frequency */
	99	need_gpio = 1;
	100	break;
	101	default:
	102	if (dev->xc_fw_load_done)
	103	need_gpio = 1;
	104	break;
	105	}
	106
	107	if (need_gpio) {
	108	dprintk1(1,
b9255176 SD	109	"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
b9255176 SD	110	msg->addr, msg->len, saddr);
84b5dbf3 MCC	111
	112	return dev->cx231xx_gpio_i2c_write(dev,
	113	msg->addr,
	114	msg->buf,
	115	msg->len);
	116	}
84b5dbf3 MCC	117	}
	118
	119	/* special case for Xc5000 tuner case */
	120	saddr_len = 1;
	121
	122	/* adjust the length to correct length */
	123	size -= saddr_len;
	124	buf_ptr = (u8 *) (msg->buf + 1);
	125
	126	do {
	127	/* prepare xfer_data struct */
	128	req_data.dev_addr = msg->addr;
	129	req_data.direction = msg->flags;
	130	req_data.saddr_len = saddr_len;
	131	req_data.saddr_dat = msg->buf[0];
	132	req_data.buf_size = size > 16 ? 16 : size;
	133	req_data.p_buffer = (u8 ) (buf_ptr + loop 16);
	134
	135	bus->i2c_nostop = (size > 16) ? 1 : 0;
	136	bus->i2c_reserve = (loop == 0) ? 0 : 1;
	137
	138	/* usb send command */
	139	status = dev->cx231xx_send_usb_command(bus, &req_data);
	140	loop++;
	141
	142	if (size >= 16)
	143	size -= 16;
	144	else
	145	size = 0;
	146
	147	} while (size > 0);
	148
	149	bus->i2c_nostop = 0;
	150	bus->i2c_reserve = 0;
	151
	152	} else { /* regular case */
	153
	154	/* prepare xfer_data struct */
	155	req_data.dev_addr = msg->addr;
	156	req_data.direction = msg->flags;
	157	req_data.saddr_len = 0;
	158	req_data.saddr_dat = 0;
	159	req_data.buf_size = msg->len;
	160	req_data.p_buffer = msg->buf;
	161
	162	/* usb send command */
	163	status = dev->cx231xx_send_usb_command(bus, &req_data);
	164	}
	165
	166	return status < 0 ? status : 0;
e0d3bafd SD	167	}
	168
	169	/*
	170	* cx231xx_i2c_recv_bytes()
	171	* read a byte from the i2c device
	172	*/
	173	static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	174	const struct i2c_msg *msg)
e0d3bafd	175	{
84b5dbf3	176	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	177	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	178	struct cx231xx_i2c_xfer_data req_data;
	179	int status = 0;
	180	u16 saddr = 0;
	181	u8 need_gpio = 0;
	182
	183	if ((bus->nr == 1) && (msg->addr == 0x61)
	184	&& dev->tuner_type == TUNER_XC5000) {
	185
	186	if (msg->len == 2)
	187	saddr = msg->buf[0] << 8 \| msg->buf[1];
	188	else if (msg->len == 1)
	189	saddr = msg->buf[0];
	190
	191	if (dev->xc_fw_load_done) {
	192
	193	switch (saddr) {
	194	case 0x0009: /* BUSY check */
	195	dprintk1(1,
b9255176 SD	196	"GPIO R E A D: Special case BUSY check \n");
b9255176 SD	197	/Try read BUSY register, just set it to zero/
84b5dbf3 MCC	198	msg->buf[0] = 0;
	199	if (msg->len == 2)
	200	msg->buf[1] = 0;
	201	return 0;
	202	case 0x0004: /* read Lock status */
	203	need_gpio = 1;
	204	break;
	205
	206	}
	207
	208	if (need_gpio) {
b9255176 SD	209	/* this is a special case to handle Xceive tuner
	210	clock stretch issue with gpio based I2C */
	211
84b5dbf3	212	dprintk1(1,
b9255176 SD	213	"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
	214	msg->addr, msg->len,
	215	msg->buf[0] << 8 \| msg->buf[1]);
	216
84b5dbf3 MCC	217	status =
	218	dev->cx231xx_gpio_i2c_write(dev, msg->addr,
	219	msg->buf,
	220	msg->len);
	221	status =
	222	dev->cx231xx_gpio_i2c_read(dev, msg->addr,
	223	msg->buf,
	224	msg->len);
	225	return status;
	226	}
	227	}
	228
	229	/* prepare xfer_data struct */
	230	req_data.dev_addr = msg->addr;
	231	req_data.direction = msg->flags;
	232	req_data.saddr_len = msg->len;
	233	req_data.saddr_dat = msg->buf[0] << 8 \| msg->buf[1];
	234	req_data.buf_size = msg->len;
	235	req_data.p_buffer = msg->buf;
	236
	237	/* usb send command */
	238	status = dev->cx231xx_send_usb_command(bus, &req_data);
	239
	240	} else {
	241
	242	/* prepare xfer_data struct */
	243	req_data.dev_addr = msg->addr;
	244	req_data.direction = msg->flags;
	245	req_data.saddr_len = 0;
	246	req_data.saddr_dat = 0;
	247	req_data.buf_size = msg->len;
	248	req_data.p_buffer = msg->buf;
	249
	250	/* usb send command */
	251	status = dev->cx231xx_send_usb_command(bus, &req_data);
	252	}
	253
	254	return status < 0 ? status : 0;
e0d3bafd SD	255	}
	256
	257	/*
	258	* cx231xx_i2c_recv_bytes_with_saddr()
	259	* read a byte from the i2c device
	260	*/
	261	static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
84b5dbf3 MCC	262	const struct i2c_msg *msg1,
84b5dbf3 MCC	263	const struct i2c_msg *msg2)
e0d3bafd	264	{
84b5dbf3	265	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	266	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	267	struct cx231xx_i2c_xfer_data req_data;
	268	int status = 0;
	269	u16 saddr = 0;
	270	u8 need_gpio = 0;
	271
	272	if (msg1->len == 2)
	273	saddr = msg1->buf[0] << 8 \| msg1->buf[1];
	274	else if (msg1->len == 1)
	275	saddr = msg1->buf[0];
	276
	277	if ((bus->nr == 1) && (msg2->addr == 0x61)
	278	&& dev->tuner_type == TUNER_XC5000) {
	279
	280	if ((msg2->len < 16)) {
	281
	282	dprintk1(1,
b9255176 SD	283	"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
b9255176 SD	284	msg2->addr, msg2->len, saddr, msg1->len);
84b5dbf3 MCC	285
	286	switch (saddr) {
	287	case 0x0008: /* read FW load status */
	288	need_gpio = 1;
	289	break;
	290	case 0x0004: /* read Lock status */
	291	need_gpio = 1;
	292	break;
	293	}
	294
	295	if (need_gpio) {
	296	status =
	297	dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
	298	msg1->buf,
	299	msg1->len);
	300	status =
	301	dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
	302	msg2->buf,
	303	msg2->len);
	304	return status;
	305	}
	306	}
	307	}
	308
	309	/* prepare xfer_data struct */
	310	req_data.dev_addr = msg2->addr;
	311	req_data.direction = msg2->flags;
	312	req_data.saddr_len = msg1->len;
	313	req_data.saddr_dat = saddr;
	314	req_data.buf_size = msg2->len;
	315	req_data.p_buffer = msg2->buf;
	316
	317	/* usb send command */
	318	status = dev->cx231xx_send_usb_command(bus, &req_data);
	319
	320	return status < 0 ? status : 0;
e0d3bafd SD	321	}
	322
	323	/*
	324	* cx231xx_i2c_check_for_device()
	325	* check if there is a i2c_device at the supplied address
	326	*/
	327	static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
84b5dbf3	328	const struct i2c_msg *msg)
e0d3bafd	329	{
84b5dbf3	330	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	331	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	332	struct cx231xx_i2c_xfer_data req_data;
84b5dbf3 MCC	333	int status = 0;
e0d3bafd	334
84b5dbf3 MCC	335	/* prepare xfer_data struct */
	336	req_data.dev_addr = msg->addr;
	337	req_data.direction = msg->flags;
	338	req_data.saddr_len = 0;
	339	req_data.saddr_dat = 0;
	340	req_data.buf_size = 0;
	341	req_data.p_buffer = NULL;
e0d3bafd	342
84b5dbf3 MCC	343	/* usb send command */
84b5dbf3 MCC	344	status = dev->cx231xx_send_usb_command(bus, &req_data);
e0d3bafd	345
84b5dbf3	346	return status < 0 ? status : 0;
e0d3bafd SD	347	}
	348
	349	/*
	350	* cx231xx_i2c_xfer()
	351	* the main i2c transfer function
	352	*/
	353	static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
84b5dbf3	354	struct i2c_msg msgs[], int num)
e0d3bafd SD	355	{
	356	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	357	struct cx231xx *dev = bus->dev;
	358	int addr, rc, i, byte;
	359
	360	if (num <= 0)
	361	return 0;
64fbf444	362	mutex_lock(&dev->i2c_lock);
e0d3bafd SD	363	for (i = 0; i < num; i++) {
	364
	365	addr = msgs[i].addr >> 1;
	366
	367	dprintk2(2, "%s %s addr=%x len=%d:",
	368	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
	369	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
b9255176 SD	370	if (!msgs[i].len) {
b9255176 SD	371	/* no len: check only for device presence */
e0d3bafd SD	372	rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
	373	if (rc < 0) {
	374	dprintk2(2, " no device\n");
b8383962	375	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	376	return rc;
	377	}
	378
	379	} else if (msgs[i].flags & I2C_M_RD) {
	380	/* read bytes */
	381	rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
	382	if (i2c_debug >= 2) {
	383	for (byte = 0; byte < msgs[i].len; byte++)
	384	printk(" %02x", msgs[i].buf[byte]);
	385	}
	386	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
84b5dbf3	387	msgs[i].addr == msgs[i + 1].addr
64fbf444	388	&& (msgs[i].len <= 2) && (bus->nr < 3)) {
e0d3bafd	389	/* read bytes */
84b5dbf3 MCC	390	rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
	391	&msgs[i],
	392	&msgs[i + 1]);
e0d3bafd SD	393	if (i2c_debug >= 2) {
	394	for (byte = 0; byte < msgs[i].len; byte++)
	395	printk(" %02x", msgs[i].buf[byte]);
	396	}
84b5dbf3	397	i++;
e0d3bafd SD	398	} else {
	399	/* write bytes */
	400	if (i2c_debug >= 2) {
	401	for (byte = 0; byte < msgs[i].len; byte++)
	402	printk(" %02x", msgs[i].buf[byte]);
	403	}
84b5dbf3	404	rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
e0d3bafd SD	405	}
	406	if (rc < 0)
	407	goto err;
	408	if (i2c_debug >= 2)
	409	printk("\n");
	410	}
64fbf444	411	mutex_unlock(&dev->i2c_lock);
e0d3bafd	412	return num;
b9255176	413	err:
e0d3bafd	414	dprintk2(2, " ERROR: %i\n", rc);
64fbf444	415	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	416	return rc;
	417	}
	418
	419	/* ----------------------------------------------------------- */
	420
	421	/*
	422	* functionality()
	423	*/
	424	static u32 functionality(struct i2c_adapter *adap)
	425	{
	426	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	427	}
	428
e0d3bafd	429	static struct i2c_algorithm cx231xx_algo = {
84b5dbf3	430	.master_xfer = cx231xx_i2c_xfer,
e0d3bafd SD	431	.functionality = functionality,
	432	};
	433
	434	static struct i2c_adapter cx231xx_adap_template = {
	435	.owner = THIS_MODULE,
e0d3bafd	436	.name = "cx231xx",
e0d3bafd	437	.algo = &cx231xx_algo,
e0d3bafd SD	438	};
	439
	440	static struct i2c_client cx231xx_client_template = {
	441	.name = "cx231xx internal",
	442	};
	443
	444	/* ----------------------------------------------------------- */
	445
	446	/*
	447	* i2c_devs
	448	* incomplete list of known devices
	449	*/
	450	static char *i2c_devs[128] = {
	451	[0x60 >> 1] = "colibri",
	452	[0x88 >> 1] = "hammerhead",
84b5dbf3	453	[0x8e >> 1] = "CIR",
e0d3bafd	454	[0x32 >> 1] = "GeminiIII",
84b5dbf3	455	[0x02 >> 1] = "Aquarius",
e0d3bafd SD	456	[0xa0 >> 1] = "eeprom",
	457	[0xc0 >> 1] = "tuner/XC3028",
	458	[0xc2 >> 1] = "tuner/XC5000",
	459	};
	460
	461	/*
	462	* cx231xx_do_i2c_scan()
	463	* check i2c address range for devices
	464	*/
	465	void cx231xx_do_i2c_scan(struct cx231xx dev, struct i2c_client c)
	466	{
	467	unsigned char buf;
	468	int i, rc;
	469
84b5dbf3	470	cx231xx_info(": Checking for I2C devices ..\n");
e0d3bafd SD	471	for (i = 0; i < 128; i++) {
	472	c->addr = i;
	473	rc = i2c_master_recv(c, &buf, 0);
	474	if (rc < 0)
	475	continue;
	476	cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n",
84b5dbf3 MCC	477	dev->name, i << 1,
84b5dbf3 MCC	478	i2c_devs[i] ? i2c_devs[i] : "???");
e0d3bafd	479	}
84b5dbf3	480	cx231xx_info(": Completed Checking for I2C devices.\n");
e0d3bafd SD	481	}
e0d3bafd SD	482
e0d3bafd SD	483	/*
	484	* cx231xx_i2c_register()
	485	* register i2c bus
	486	*/
	487	int cx231xx_i2c_register(struct cx231xx_i2c *bus)
	488	{
84b5dbf3	489	struct cx231xx *dev = bus->dev;
e0d3bafd	490
84b5dbf3	491	BUG_ON(!dev->cx231xx_send_usb_command);
e0d3bafd	492
84b5dbf3 MCC	493	memcpy(&bus->i2c_adap, &cx231xx_adap_template, sizeof(bus->i2c_adap));
84b5dbf3 MCC	494	memcpy(&bus->i2c_algo, &cx231xx_algo, sizeof(bus->i2c_algo));
e0d3bafd SD	495	memcpy(&bus->i2c_client, &cx231xx_client_template,
	496	sizeof(bus->i2c_client));
	497
	498	bus->i2c_adap.dev.parent = &dev->udev->dev;
	499
84b5dbf3	500	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
e0d3bafd SD	501
	502	bus->i2c_algo.data = bus;
	503	bus->i2c_adap.algo_data = bus;
b1196126	504	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
e0d3bafd SD	505	i2c_add_adapter(&bus->i2c_adap);
	506
	507	bus->i2c_client.adapter = &bus->i2c_adap;
	508
	509	if (0 == bus->i2c_rc) {
e0d3bafd SD	510	if (i2c_scan)
	511	cx231xx_do_i2c_scan(dev, &bus->i2c_client);
	512	} else
	513	cx231xx_warn("%s: i2c bus %d register FAILED\n",
84b5dbf3	514	dev->name, bus->nr);
e0d3bafd SD	515
	516	return bus->i2c_rc;
	517	}
	518
	519	/*
	520	* cx231xx_i2c_unregister()
	521	* unregister i2c_bus
	522	*/
	523	int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
	524	{
	525	i2c_del_adapter(&bus->i2c_adap);
	526	return 0;
	527	}