[mirror_ubuntu-jammy-kernel.git] / drivers / media / usb / 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)

static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
{
	if (bus_nr == 1)
		return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
	return bus_nr;
}

static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
			const struct i2c_msg *msg, int tuner_type)
{
	int i2c_port = get_real_i2c_port(dev, bus->nr);

	if (i2c_port != dev->board.tuner_i2c_master)
		return false;

	if (msg->addr != dev->board.tuner_addr)
		return false;

	if (dev->tuner_type != tuner_type)
		return false;

	return true;
}

/*
 * cx231xx_i2c_send_bytes()
 */
static 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 (is_tuner(dev, bus, msg, 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 (is_tuner(dev, bus, msg, 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 (is_tuner(dev, bus, msg2, 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;

		dprintk2(2, "%s %s addr=0x%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(KERN_CONT " %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)) {
			/* write bytes */
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
				printk(KERN_CONT "\n");
			}
			/* read bytes */
			dprintk2(2, "plus %s %s addr=0x%x len=%d:",
				(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
				i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
			rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
							       &msgs[i],
							       &msgs[i + 1]);
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i+1].len; byte++)
					printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
			}
			i++;
		} else {
			/* write bytes */
			if (i2c_debug >= 2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(KERN_CONT " %02x", msgs[i].buf[byte]);
			}
			rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
		}
		if (rc < 0)
			goto err;
		if (i2c_debug >= 2)
			printk(KERN_CONT "\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,
};

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

/*
 * 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",
	[0xc2 >> 1] = "tuner",
};

/*
 * cx231xx_do_i2c_scan()
 * check i2c address range for devices
 */
void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
{
	unsigned char buf;
	int i, rc;
	struct i2c_client client;

	memset(&client, 0, sizeof(client));
	client.adapter = cx231xx_get_i2c_adap(dev, i2c_port);

	cx231xx_info(": Checking for I2C devices on port=%d ..\n", i2c_port);
	for (i = 0; i < 128; i++) {
		client.addr = i;
		rc = i2c_master_recv(&client, &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 on port=%d.\n",
		i2c_port);
}

/*
 * 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);

	bus->i2c_adap = cx231xx_adap_template;
	bus->i2c_adap.dev.parent = &dev->udev->dev;

	snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);

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

	if (0 == bus->i2c_rc) {
		if (i2c_scan)
			cx231xx_do_i2c_scan(dev, bus->nr);
	} 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;
}

struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port)
{
	switch (i2c_port) {
	case I2C_0:
		return &dev->i2c_bus[0].i2c_adap;
	case I2C_1:
		return &dev->i2c_bus[1].i2c_adap;
	case I2C_2:
		return &dev->i2c_bus[2].i2c_adap;
	case I2C_1_MUX_1:
	case I2C_1_MUX_3:
		return &dev->i2c_bus[1].i2c_adap;
	default:
		return NULL;
	}
}
EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);
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
8a025348 MS	57	static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr)
	58	{
	59	if (bus_nr == 1)
	60	return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1;
	61	return bus_nr;
	62	}
	63
3f25ffa2 MCC	64	static inline bool is_tuner(struct cx231xx dev, struct cx231xx_i2c bus,
	65	const struct i2c_msg *msg, int tuner_type)
	66	{
8a025348 MS	67	int i2c_port = get_real_i2c_port(dev, bus->nr);
	68
	69	if (i2c_port != dev->board.tuner_i2c_master)
3f25ffa2 MCC	70	return false;
	71
	72	if (msg->addr != dev->board.tuner_addr)
	73	return false;
	74
	75	if (dev->tuner_type != tuner_type)
	76	return false;
	77
	78	return true;
	79	}
	80
e0d3bafd SD	81	/*
	82	* cx231xx_i2c_send_bytes()
	83	*/
d4c06133 MCC	84	static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
d4c06133 MCC	85	const struct i2c_msg *msg)
e0d3bafd SD	86	{
	87	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	88	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	89	struct cx231xx_i2c_xfer_data req_data;
	90	int status = 0;
	91	u16 size = 0;
	92	u8 loop = 0;
	93	u8 saddr_len = 1;
	94	u8 *buf_ptr = NULL;
	95	u16 saddr = 0;
	96	u8 need_gpio = 0;
	97
3f25ffa2	98	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	99	size = msg->len;
	100
	101	if (size == 2) { /* register write sub addr */
6e4f574b SD	102	/* Just writing sub address will cause problem
6e4f574b SD	103	* to XC5000. So ignore the request */
84b5dbf3	104	return 0;
84b5dbf3	105	} else if (size == 4) { /* register write with sub addr */
84b5dbf3 MCC	106	if (msg->len >= 2)
	107	saddr = msg->buf[0] << 8 \| msg->buf[1];
	108	else if (msg->len == 1)
	109	saddr = msg->buf[0];
	110
	111	switch (saddr) {
	112	case 0x0000: /* start tuner calibration mode */
	113	need_gpio = 1;
b9255176 SD	114	/* FW Loading is done */
b9255176 SD	115	dev->xc_fw_load_done = 1;
84b5dbf3 MCC	116	break;
	117	case 0x000D: /* Set signal source */
	118	case 0x0001: /* Set TV standard - Video */
	119	case 0x0002: /* Set TV standard - Audio */
	120	case 0x0003: /* Set RF Frequency */
	121	need_gpio = 1;
	122	break;
	123	default:
	124	if (dev->xc_fw_load_done)
	125	need_gpio = 1;
	126	break;
	127	}
	128
	129	if (need_gpio) {
	130	dprintk1(1,
b9255176 SD	131	"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
b9255176 SD	132	msg->addr, msg->len, saddr);
84b5dbf3 MCC	133
	134	return dev->cx231xx_gpio_i2c_write(dev,
	135	msg->addr,
	136	msg->buf,
	137	msg->len);
	138	}
84b5dbf3 MCC	139	}
	140
	141	/* special case for Xc5000 tuner case */
	142	saddr_len = 1;
	143
	144	/* adjust the length to correct length */
	145	size -= saddr_len;
	146	buf_ptr = (u8 *) (msg->buf + 1);
	147
	148	do {
	149	/* prepare xfer_data struct */
	150	req_data.dev_addr = msg->addr;
	151	req_data.direction = msg->flags;
	152	req_data.saddr_len = saddr_len;
	153	req_data.saddr_dat = msg->buf[0];
	154	req_data.buf_size = size > 16 ? 16 : size;
	155	req_data.p_buffer = (u8 ) (buf_ptr + loop 16);
	156
	157	bus->i2c_nostop = (size > 16) ? 1 : 0;
	158	bus->i2c_reserve = (loop == 0) ? 0 : 1;
	159
	160	/* usb send command */
	161	status = dev->cx231xx_send_usb_command(bus, &req_data);
	162	loop++;
	163
	164	if (size >= 16)
	165	size -= 16;
	166	else
	167	size = 0;
	168
	169	} while (size > 0);
	170
	171	bus->i2c_nostop = 0;
	172	bus->i2c_reserve = 0;
	173
	174	} else { /* regular case */
	175
	176	/* prepare xfer_data struct */
	177	req_data.dev_addr = msg->addr;
	178	req_data.direction = msg->flags;
	179	req_data.saddr_len = 0;
	180	req_data.saddr_dat = 0;
	181	req_data.buf_size = msg->len;
	182	req_data.p_buffer = msg->buf;
	183
	184	/* usb send command */
	185	status = dev->cx231xx_send_usb_command(bus, &req_data);
	186	}
	187
	188	return status < 0 ? status : 0;
e0d3bafd SD	189	}
	190
	191	/*
	192	* cx231xx_i2c_recv_bytes()
	193	* read a byte from the i2c device
	194	*/
	195	static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	196	const struct i2c_msg *msg)
e0d3bafd	197	{
84b5dbf3	198	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	199	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	200	struct cx231xx_i2c_xfer_data req_data;
	201	int status = 0;
	202	u16 saddr = 0;
	203	u8 need_gpio = 0;
	204
3f25ffa2	205	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	206	if (msg->len == 2)
	207	saddr = msg->buf[0] << 8 \| msg->buf[1];
	208	else if (msg->len == 1)
	209	saddr = msg->buf[0];
	210
	211	if (dev->xc_fw_load_done) {
	212
	213	switch (saddr) {
	214	case 0x0009: /* BUSY check */
	215	dprintk1(1,
b9255176 SD	216	"GPIO R E A D: Special case BUSY check \n");
b9255176 SD	217	/Try read BUSY register, just set it to zero/
84b5dbf3 MCC	218	msg->buf[0] = 0;
	219	if (msg->len == 2)
	220	msg->buf[1] = 0;
	221	return 0;
	222	case 0x0004: /* read Lock status */
	223	need_gpio = 1;
	224	break;
	225
	226	}
	227
	228	if (need_gpio) {
b9255176 SD	229	/* this is a special case to handle Xceive tuner
	230	clock stretch issue with gpio based I2C */
	231
84b5dbf3	232	dprintk1(1,
b9255176 SD	233	"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
	234	msg->addr, msg->len,
	235	msg->buf[0] << 8 \| msg->buf[1]);
	236
84b5dbf3 MCC	237	status =
	238	dev->cx231xx_gpio_i2c_write(dev, msg->addr,
	239	msg->buf,
	240	msg->len);
	241	status =
	242	dev->cx231xx_gpio_i2c_read(dev, msg->addr,
	243	msg->buf,
	244	msg->len);
	245	return status;
	246	}
	247	}
	248
	249	/* prepare xfer_data struct */
	250	req_data.dev_addr = msg->addr;
	251	req_data.direction = msg->flags;
	252	req_data.saddr_len = msg->len;
	253	req_data.saddr_dat = msg->buf[0] << 8 \| msg->buf[1];
	254	req_data.buf_size = msg->len;
	255	req_data.p_buffer = msg->buf;
	256
	257	/* usb send command */
	258	status = dev->cx231xx_send_usb_command(bus, &req_data);
	259
	260	} else {
	261
	262	/* prepare xfer_data struct */
	263	req_data.dev_addr = msg->addr;
	264	req_data.direction = msg->flags;
	265	req_data.saddr_len = 0;
	266	req_data.saddr_dat = 0;
	267	req_data.buf_size = msg->len;
	268	req_data.p_buffer = msg->buf;
	269
	270	/* usb send command */
	271	status = dev->cx231xx_send_usb_command(bus, &req_data);
	272	}
	273
	274	return status < 0 ? status : 0;
e0d3bafd SD	275	}
	276
	277	/*
	278	* cx231xx_i2c_recv_bytes_with_saddr()
	279	* read a byte from the i2c device
	280	*/
	281	static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
84b5dbf3 MCC	282	const struct i2c_msg *msg1,
84b5dbf3 MCC	283	const struct i2c_msg *msg2)
e0d3bafd	284	{
84b5dbf3	285	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	286	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	287	struct cx231xx_i2c_xfer_data req_data;
	288	int status = 0;
	289	u16 saddr = 0;
	290	u8 need_gpio = 0;
	291
	292	if (msg1->len == 2)
	293	saddr = msg1->buf[0] << 8 \| msg1->buf[1];
	294	else if (msg1->len == 1)
	295	saddr = msg1->buf[0];
	296
3f25ffa2	297	if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
84b5dbf3 MCC	298	if ((msg2->len < 16)) {
	299
	300	dprintk1(1,
b9255176 SD	301	"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
b9255176 SD	302	msg2->addr, msg2->len, saddr, msg1->len);
84b5dbf3 MCC	303
	304	switch (saddr) {
	305	case 0x0008: /* read FW load status */
	306	need_gpio = 1;
	307	break;
	308	case 0x0004: /* read Lock status */
	309	need_gpio = 1;
	310	break;
	311	}
	312
	313	if (need_gpio) {
	314	status =
	315	dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
	316	msg1->buf,
	317	msg1->len);
	318	status =
	319	dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
	320	msg2->buf,
	321	msg2->len);
	322	return status;
	323	}
	324	}
	325	}
	326
	327	/* prepare xfer_data struct */
	328	req_data.dev_addr = msg2->addr;
	329	req_data.direction = msg2->flags;
	330	req_data.saddr_len = msg1->len;
	331	req_data.saddr_dat = saddr;
	332	req_data.buf_size = msg2->len;
	333	req_data.p_buffer = msg2->buf;
	334
	335	/* usb send command */
	336	status = dev->cx231xx_send_usb_command(bus, &req_data);
	337
	338	return status < 0 ? status : 0;
e0d3bafd SD	339	}
	340
	341	/*
	342	* cx231xx_i2c_check_for_device()
	343	* check if there is a i2c_device at the supplied address
	344	*/
	345	static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
84b5dbf3	346	const struct i2c_msg *msg)
e0d3bafd	347	{
84b5dbf3	348	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	349	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	350	struct cx231xx_i2c_xfer_data req_data;
84b5dbf3 MCC	351	int status = 0;
e0d3bafd	352
84b5dbf3 MCC	353	/* prepare xfer_data struct */
	354	req_data.dev_addr = msg->addr;
	355	req_data.direction = msg->flags;
	356	req_data.saddr_len = 0;
	357	req_data.saddr_dat = 0;
	358	req_data.buf_size = 0;
	359	req_data.p_buffer = NULL;
e0d3bafd	360
84b5dbf3 MCC	361	/* usb send command */
84b5dbf3 MCC	362	status = dev->cx231xx_send_usb_command(bus, &req_data);
e0d3bafd	363
84b5dbf3	364	return status < 0 ? status : 0;
e0d3bafd SD	365	}
	366
	367	/*
	368	* cx231xx_i2c_xfer()
	369	* the main i2c transfer function
	370	*/
	371	static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
84b5dbf3	372	struct i2c_msg msgs[], int num)
e0d3bafd SD	373	{
	374	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	375	struct cx231xx *dev = bus->dev;
	376	int addr, rc, i, byte;
	377
	378	if (num <= 0)
	379	return 0;
64fbf444	380	mutex_lock(&dev->i2c_lock);
e0d3bafd SD	381	for (i = 0; i < num; i++) {
e0d3bafd SD	382
1134e9d1	383	addr = msgs[i].addr;
e0d3bafd	384
1134e9d1	385	dprintk2(2, "%s %s addr=0x%x len=%d:",
e0d3bafd SD	386	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
e0d3bafd SD	387	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
b9255176 SD	388	if (!msgs[i].len) {
b9255176 SD	389	/* no len: check only for device presence */
e0d3bafd SD	390	rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
	391	if (rc < 0) {
	392	dprintk2(2, " no device\n");
b8383962	393	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	394	return rc;
	395	}
	396
	397	} else if (msgs[i].flags & I2C_M_RD) {
	398	/* read bytes */
	399	rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
	400	if (i2c_debug >= 2) {
	401	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e	402	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
e0d3bafd SD	403	}
e0d3bafd SD	404	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
84b5dbf3	405	msgs[i].addr == msgs[i + 1].addr
64fbf444	406	&& (msgs[i].len <= 2) && (bus->nr < 3)) {
1134e9d1 MS	407	/* write bytes */
	408	if (i2c_debug >= 2) {
	409	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e MS	410	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
6f64eb0e MS	411	printk(KERN_CONT "\n");
1134e9d1	412	}
e0d3bafd	413	/* read bytes */
1134e9d1 MS	414	dprintk2(2, "plus %s %s addr=0x%x len=%d:",
	415	(msgs[i+1].flags & I2C_M_RD) ? "read" : "write",
	416	i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len);
84b5dbf3 MCC	417	rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
	418	&msgs[i],
	419	&msgs[i + 1]);
e0d3bafd	420	if (i2c_debug >= 2) {
1134e9d1	421	for (byte = 0; byte < msgs[i+1].len; byte++)
6f64eb0e	422	printk(KERN_CONT " %02x", msgs[i+1].buf[byte]);
e0d3bafd	423	}
84b5dbf3	424	i++;
e0d3bafd SD	425	} else {
	426	/* write bytes */
	427	if (i2c_debug >= 2) {
	428	for (byte = 0; byte < msgs[i].len; byte++)
6f64eb0e	429	printk(KERN_CONT " %02x", msgs[i].buf[byte]);
e0d3bafd	430	}
84b5dbf3	431	rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
e0d3bafd SD	432	}
	433	if (rc < 0)
	434	goto err;
	435	if (i2c_debug >= 2)
6f64eb0e	436	printk(KERN_CONT "\n");
e0d3bafd	437	}
64fbf444	438	mutex_unlock(&dev->i2c_lock);
e0d3bafd	439	return num;
b9255176	440	err:
e0d3bafd	441	dprintk2(2, " ERROR: %i\n", rc);
64fbf444	442	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	443	return rc;
	444	}
	445
	446	/* ----------------------------------------------------------- */
	447
	448	/*
	449	* functionality()
	450	*/
	451	static u32 functionality(struct i2c_adapter *adap)
	452	{
	453	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	454	}
	455
e0d3bafd	456	static struct i2c_algorithm cx231xx_algo = {
84b5dbf3	457	.master_xfer = cx231xx_i2c_xfer,
e0d3bafd SD	458	.functionality = functionality,
	459	};
	460
	461	static struct i2c_adapter cx231xx_adap_template = {
	462	.owner = THIS_MODULE,
e0d3bafd	463	.name = "cx231xx",
e0d3bafd	464	.algo = &cx231xx_algo,
e0d3bafd SD	465	};
e0d3bafd SD	466
e0d3bafd SD	467	/* ----------------------------------------------------------- */
	468
	469	/*
	470	* i2c_devs
	471	* incomplete list of known devices
	472	*/
	473	static char *i2c_devs[128] = {
	474	[0x60 >> 1] = "colibri",
	475	[0x88 >> 1] = "hammerhead",
84b5dbf3	476	[0x8e >> 1] = "CIR",
e0d3bafd	477	[0x32 >> 1] = "GeminiIII",
84b5dbf3	478	[0x02 >> 1] = "Aquarius",
e0d3bafd	479	[0xa0 >> 1] = "eeprom",
3f25ffa2 MCC	480	[0xc0 >> 1] = "tuner",
3f25ffa2 MCC	481	[0xc2 >> 1] = "tuner",
e0d3bafd SD	482	};
	483
	484	/*
	485	* cx231xx_do_i2c_scan()
	486	* check i2c address range for devices
	487	*/
7c894a3b	488	void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port)
e0d3bafd SD	489	{
	490	unsigned char buf;
	491	int i, rc;
7c894a3b	492	struct i2c_client client;
e0d3bafd	493
7c894a3b	494	memset(&client, 0, sizeof(client));
c3c3f1ae	495	client.adapter = cx231xx_get_i2c_adap(dev, i2c_port);
7c894a3b MS	496
7c894a3b MS	497	cx231xx_info(": Checking for I2C devices on port=%d ..\n", i2c_port);
e0d3bafd	498	for (i = 0; i < 128; i++) {
7c894a3b MS	499	client.addr = i;
7c894a3b MS	500	rc = i2c_master_recv(&client, &buf, 0);
e0d3bafd SD	501	if (rc < 0)
	502	continue;
	503	cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n",
84b5dbf3 MCC	504	dev->name, i << 1,
84b5dbf3 MCC	505	i2c_devs[i] ? i2c_devs[i] : "???");
e0d3bafd	506	}
7c894a3b MS	507	cx231xx_info(": Completed Checking for I2C devices on port=%d.\n",
7c894a3b MS	508	i2c_port);
e0d3bafd SD	509	}
e0d3bafd SD	510
e0d3bafd SD	511	/*
	512	* cx231xx_i2c_register()
	513	* register i2c bus
	514	*/
	515	int cx231xx_i2c_register(struct cx231xx_i2c *bus)
	516	{
84b5dbf3	517	struct cx231xx *dev = bus->dev;
e0d3bafd	518
84b5dbf3	519	BUG_ON(!dev->cx231xx_send_usb_command);
e0d3bafd	520
23ba641a	521	bus->i2c_adap = cx231xx_adap_template;
e0d3bafd SD	522	bus->i2c_adap.dev.parent = &dev->udev->dev;
e0d3bafd SD	523
8da4f2d5	524	snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr);
e0d3bafd	525
e0d3bafd	526	bus->i2c_adap.algo_data = bus;
b1196126	527	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
e0d3bafd SD	528	i2c_add_adapter(&bus->i2c_adap);
e0d3bafd SD	529
e0d3bafd	530	if (0 == bus->i2c_rc) {
e0d3bafd	531	if (i2c_scan)
7c894a3b	532	cx231xx_do_i2c_scan(dev, bus->nr);
e0d3bafd SD	533	} else
e0d3bafd SD	534	cx231xx_warn("%s: i2c bus %d register FAILED\n",
84b5dbf3	535	dev->name, bus->nr);
e0d3bafd SD	536
	537	return bus->i2c_rc;
	538	}
	539
	540	/*
	541	* cx231xx_i2c_unregister()
	542	* unregister i2c_bus
	543	*/
	544	int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
	545	{
	546	i2c_del_adapter(&bus->i2c_adap);
	547	return 0;
	548	}
c3c3f1ae MS	549
	550	struct i2c_adapter cx231xx_get_i2c_adap(struct cx231xx dev, int i2c_port)
	551	{
	552	switch (i2c_port) {
	553	case I2C_0:
	554	return &dev->i2c_bus[0].i2c_adap;
	555	case I2C_1:
	556	return &dev->i2c_bus[1].i2c_adap;
	557	case I2C_2:
	558	return &dev->i2c_bus[2].i2c_adap;
	559	case I2C_1_MUX_1:
	560	case I2C_1_MUX_3:
	561	return &dev->i2c_bus[1].i2c_adap;
	562	default:
	563	return NULL;
	564	}
	565	}
	566	EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);