[deliverable/linux.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 bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
			const struct i2c_msg *msg, int tuner_type)
{
	if (bus->nr != 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 >> 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",
	[0xc2 >> 1] = "tuner",
};

/*
 * 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);

	bus->i2c_adap = cx231xx_adap_template;
	bus->i2c_client = cx231xx_client_template;
	bus->i2c_adap.dev.parent = &dev->udev->dev;

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

	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
3f25ffa2 MCC	57	static inline bool is_tuner(struct cx231xx dev, struct cx231xx_i2c bus,
	58	const struct i2c_msg *msg, int tuner_type)
	59	{
	60	if (bus->nr != dev->board.tuner_i2c_master)
	61	return false;
	62
	63	if (msg->addr != dev->board.tuner_addr)
	64	return false;
	65
	66	if (dev->tuner_type != tuner_type)
	67	return false;
	68
	69	return true;
	70	}
	71
e0d3bafd SD	72	/*
	73	* cx231xx_i2c_send_bytes()
	74	*/
d4c06133 MCC	75	static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
d4c06133 MCC	76	const struct i2c_msg *msg)
e0d3bafd SD	77	{
	78	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	79	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	80	struct cx231xx_i2c_xfer_data req_data;
	81	int status = 0;
	82	u16 size = 0;
	83	u8 loop = 0;
	84	u8 saddr_len = 1;
	85	u8 *buf_ptr = NULL;
	86	u16 saddr = 0;
	87	u8 need_gpio = 0;
	88
3f25ffa2	89	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	90	size = msg->len;
	91
	92	if (size == 2) { /* register write sub addr */
6e4f574b SD	93	/* Just writing sub address will cause problem
6e4f574b SD	94	* to XC5000. So ignore the request */
84b5dbf3	95	return 0;
84b5dbf3	96	} else if (size == 4) { /* register write with sub addr */
84b5dbf3 MCC	97	if (msg->len >= 2)
	98	saddr = msg->buf[0] << 8 \| msg->buf[1];
	99	else if (msg->len == 1)
	100	saddr = msg->buf[0];
	101
	102	switch (saddr) {
	103	case 0x0000: /* start tuner calibration mode */
	104	need_gpio = 1;
b9255176 SD	105	/* FW Loading is done */
b9255176 SD	106	dev->xc_fw_load_done = 1;
84b5dbf3 MCC	107	break;
	108	case 0x000D: /* Set signal source */
	109	case 0x0001: /* Set TV standard - Video */
	110	case 0x0002: /* Set TV standard - Audio */
	111	case 0x0003: /* Set RF Frequency */
	112	need_gpio = 1;
	113	break;
	114	default:
	115	if (dev->xc_fw_load_done)
	116	need_gpio = 1;
	117	break;
	118	}
	119
	120	if (need_gpio) {
	121	dprintk1(1,
b9255176 SD	122	"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n",
b9255176 SD	123	msg->addr, msg->len, saddr);
84b5dbf3 MCC	124
	125	return dev->cx231xx_gpio_i2c_write(dev,
	126	msg->addr,
	127	msg->buf,
	128	msg->len);
	129	}
84b5dbf3 MCC	130	}
	131
	132	/* special case for Xc5000 tuner case */
	133	saddr_len = 1;
	134
	135	/* adjust the length to correct length */
	136	size -= saddr_len;
	137	buf_ptr = (u8 *) (msg->buf + 1);
	138
	139	do {
	140	/* prepare xfer_data struct */
	141	req_data.dev_addr = msg->addr;
	142	req_data.direction = msg->flags;
	143	req_data.saddr_len = saddr_len;
	144	req_data.saddr_dat = msg->buf[0];
	145	req_data.buf_size = size > 16 ? 16 : size;
	146	req_data.p_buffer = (u8 ) (buf_ptr + loop 16);
	147
	148	bus->i2c_nostop = (size > 16) ? 1 : 0;
	149	bus->i2c_reserve = (loop == 0) ? 0 : 1;
	150
	151	/* usb send command */
	152	status = dev->cx231xx_send_usb_command(bus, &req_data);
	153	loop++;
	154
	155	if (size >= 16)
	156	size -= 16;
	157	else
	158	size = 0;
	159
	160	} while (size > 0);
	161
	162	bus->i2c_nostop = 0;
	163	bus->i2c_reserve = 0;
	164
	165	} else { /* regular case */
	166
	167	/* prepare xfer_data struct */
	168	req_data.dev_addr = msg->addr;
	169	req_data.direction = msg->flags;
	170	req_data.saddr_len = 0;
	171	req_data.saddr_dat = 0;
	172	req_data.buf_size = msg->len;
	173	req_data.p_buffer = msg->buf;
	174
	175	/* usb send command */
	176	status = dev->cx231xx_send_usb_command(bus, &req_data);
	177	}
	178
	179	return status < 0 ? status : 0;
e0d3bafd SD	180	}
	181
	182	/*
	183	* cx231xx_i2c_recv_bytes()
	184	* read a byte from the i2c device
	185	*/
	186	static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	187	const struct i2c_msg *msg)
e0d3bafd	188	{
84b5dbf3	189	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	190	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	191	struct cx231xx_i2c_xfer_data req_data;
	192	int status = 0;
	193	u16 saddr = 0;
	194	u8 need_gpio = 0;
	195
3f25ffa2	196	if (is_tuner(dev, bus, msg, TUNER_XC5000)) {
84b5dbf3 MCC	197	if (msg->len == 2)
	198	saddr = msg->buf[0] << 8 \| msg->buf[1];
	199	else if (msg->len == 1)
	200	saddr = msg->buf[0];
	201
	202	if (dev->xc_fw_load_done) {
	203
	204	switch (saddr) {
	205	case 0x0009: /* BUSY check */
	206	dprintk1(1,
b9255176 SD	207	"GPIO R E A D: Special case BUSY check \n");
b9255176 SD	208	/Try read BUSY register, just set it to zero/
84b5dbf3 MCC	209	msg->buf[0] = 0;
	210	if (msg->len == 2)
	211	msg->buf[1] = 0;
	212	return 0;
	213	case 0x0004: /* read Lock status */
	214	need_gpio = 1;
	215	break;
	216
	217	}
	218
	219	if (need_gpio) {
b9255176 SD	220	/* this is a special case to handle Xceive tuner
	221	clock stretch issue with gpio based I2C */
	222
84b5dbf3	223	dprintk1(1,
b9255176 SD	224	"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n",
	225	msg->addr, msg->len,
	226	msg->buf[0] << 8 \| msg->buf[1]);
	227
84b5dbf3 MCC	228	status =
	229	dev->cx231xx_gpio_i2c_write(dev, msg->addr,
	230	msg->buf,
	231	msg->len);
	232	status =
	233	dev->cx231xx_gpio_i2c_read(dev, msg->addr,
	234	msg->buf,
	235	msg->len);
	236	return status;
	237	}
	238	}
	239
	240	/* prepare xfer_data struct */
	241	req_data.dev_addr = msg->addr;
	242	req_data.direction = msg->flags;
	243	req_data.saddr_len = msg->len;
	244	req_data.saddr_dat = msg->buf[0] << 8 \| msg->buf[1];
	245	req_data.buf_size = msg->len;
	246	req_data.p_buffer = msg->buf;
	247
	248	/* usb send command */
	249	status = dev->cx231xx_send_usb_command(bus, &req_data);
	250
	251	} else {
	252
	253	/* prepare xfer_data struct */
	254	req_data.dev_addr = msg->addr;
	255	req_data.direction = msg->flags;
	256	req_data.saddr_len = 0;
	257	req_data.saddr_dat = 0;
	258	req_data.buf_size = msg->len;
	259	req_data.p_buffer = msg->buf;
	260
	261	/* usb send command */
	262	status = dev->cx231xx_send_usb_command(bus, &req_data);
	263	}
	264
	265	return status < 0 ? status : 0;
e0d3bafd SD	266	}
	267
	268	/*
	269	* cx231xx_i2c_recv_bytes_with_saddr()
	270	* read a byte from the i2c device
	271	*/
	272	static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
84b5dbf3 MCC	273	const struct i2c_msg *msg1,
84b5dbf3 MCC	274	const struct i2c_msg *msg2)
e0d3bafd	275	{
84b5dbf3	276	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	277	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	278	struct cx231xx_i2c_xfer_data req_data;
	279	int status = 0;
	280	u16 saddr = 0;
	281	u8 need_gpio = 0;
	282
	283	if (msg1->len == 2)
	284	saddr = msg1->buf[0] << 8 \| msg1->buf[1];
	285	else if (msg1->len == 1)
	286	saddr = msg1->buf[0];
	287
3f25ffa2	288	if (is_tuner(dev, bus, msg2, TUNER_XC5000)) {
84b5dbf3 MCC	289	if ((msg2->len < 16)) {
	290
	291	dprintk1(1,
b9255176 SD	292	"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n",
b9255176 SD	293	msg2->addr, msg2->len, saddr, msg1->len);
84b5dbf3 MCC	294
	295	switch (saddr) {
	296	case 0x0008: /* read FW load status */
	297	need_gpio = 1;
	298	break;
	299	case 0x0004: /* read Lock status */
	300	need_gpio = 1;
	301	break;
	302	}
	303
	304	if (need_gpio) {
	305	status =
	306	dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
	307	msg1->buf,
	308	msg1->len);
	309	status =
	310	dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
	311	msg2->buf,
	312	msg2->len);
	313	return status;
	314	}
	315	}
	316	}
	317
	318	/* prepare xfer_data struct */
	319	req_data.dev_addr = msg2->addr;
	320	req_data.direction = msg2->flags;
	321	req_data.saddr_len = msg1->len;
	322	req_data.saddr_dat = saddr;
	323	req_data.buf_size = msg2->len;
	324	req_data.p_buffer = msg2->buf;
	325
	326	/* usb send command */
	327	status = dev->cx231xx_send_usb_command(bus, &req_data);
	328
	329	return status < 0 ? status : 0;
e0d3bafd SD	330	}
	331
	332	/*
	333	* cx231xx_i2c_check_for_device()
	334	* check if there is a i2c_device at the supplied address
	335	*/
	336	static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
84b5dbf3	337	const struct i2c_msg *msg)
e0d3bafd	338	{
84b5dbf3	339	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	340	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	341	struct cx231xx_i2c_xfer_data req_data;
84b5dbf3 MCC	342	int status = 0;
e0d3bafd	343
84b5dbf3 MCC	344	/* prepare xfer_data struct */
	345	req_data.dev_addr = msg->addr;
	346	req_data.direction = msg->flags;
	347	req_data.saddr_len = 0;
	348	req_data.saddr_dat = 0;
	349	req_data.buf_size = 0;
	350	req_data.p_buffer = NULL;
e0d3bafd	351
84b5dbf3 MCC	352	/* usb send command */
84b5dbf3 MCC	353	status = dev->cx231xx_send_usb_command(bus, &req_data);
e0d3bafd	354
84b5dbf3	355	return status < 0 ? status : 0;
e0d3bafd SD	356	}
	357
	358	/*
	359	* cx231xx_i2c_xfer()
	360	* the main i2c transfer function
	361	*/
	362	static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
84b5dbf3	363	struct i2c_msg msgs[], int num)
e0d3bafd SD	364	{
	365	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	366	struct cx231xx *dev = bus->dev;
	367	int addr, rc, i, byte;
	368
	369	if (num <= 0)
	370	return 0;
64fbf444	371	mutex_lock(&dev->i2c_lock);
e0d3bafd SD	372	for (i = 0; i < num; i++) {
	373
	374	addr = msgs[i].addr >> 1;
	375
	376	dprintk2(2, "%s %s addr=%x len=%d:",
	377	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
	378	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
b9255176 SD	379	if (!msgs[i].len) {
b9255176 SD	380	/* no len: check only for device presence */
e0d3bafd SD	381	rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]);
	382	if (rc < 0) {
	383	dprintk2(2, " no device\n");
b8383962	384	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	385	return rc;
	386	}
	387
	388	} else if (msgs[i].flags & I2C_M_RD) {
	389	/* read bytes */
	390	rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
	391	if (i2c_debug >= 2) {
	392	for (byte = 0; byte < msgs[i].len; byte++)
	393	printk(" %02x", msgs[i].buf[byte]);
	394	}
	395	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
84b5dbf3	396	msgs[i].addr == msgs[i + 1].addr
64fbf444	397	&& (msgs[i].len <= 2) && (bus->nr < 3)) {
e0d3bafd	398	/* read bytes */
84b5dbf3 MCC	399	rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
	400	&msgs[i],
	401	&msgs[i + 1]);
e0d3bafd SD	402	if (i2c_debug >= 2) {
	403	for (byte = 0; byte < msgs[i].len; byte++)
	404	printk(" %02x", msgs[i].buf[byte]);
	405	}
84b5dbf3	406	i++;
e0d3bafd SD	407	} else {
	408	/* write bytes */
	409	if (i2c_debug >= 2) {
	410	for (byte = 0; byte < msgs[i].len; byte++)
	411	printk(" %02x", msgs[i].buf[byte]);
	412	}
84b5dbf3	413	rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
e0d3bafd SD	414	}
	415	if (rc < 0)
	416	goto err;
	417	if (i2c_debug >= 2)
	418	printk("\n");
	419	}
64fbf444	420	mutex_unlock(&dev->i2c_lock);
e0d3bafd	421	return num;
b9255176	422	err:
e0d3bafd	423	dprintk2(2, " ERROR: %i\n", rc);
64fbf444	424	mutex_unlock(&dev->i2c_lock);
e0d3bafd SD	425	return rc;
	426	}
	427
	428	/* ----------------------------------------------------------- */
	429
	430	/*
	431	* functionality()
	432	*/
	433	static u32 functionality(struct i2c_adapter *adap)
	434	{
	435	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	436	}
	437
e0d3bafd	438	static struct i2c_algorithm cx231xx_algo = {
84b5dbf3	439	.master_xfer = cx231xx_i2c_xfer,
e0d3bafd SD	440	.functionality = functionality,
	441	};
	442
	443	static struct i2c_adapter cx231xx_adap_template = {
	444	.owner = THIS_MODULE,
e0d3bafd	445	.name = "cx231xx",
e0d3bafd	446	.algo = &cx231xx_algo,
e0d3bafd SD	447	};
	448
	449	static struct i2c_client cx231xx_client_template = {
	450	.name = "cx231xx internal",
	451	};
	452
	453	/* ----------------------------------------------------------- */
	454
	455	/*
	456	* i2c_devs
	457	* incomplete list of known devices
	458	*/
	459	static char *i2c_devs[128] = {
	460	[0x60 >> 1] = "colibri",
	461	[0x88 >> 1] = "hammerhead",
84b5dbf3	462	[0x8e >> 1] = "CIR",
e0d3bafd	463	[0x32 >> 1] = "GeminiIII",
84b5dbf3	464	[0x02 >> 1] = "Aquarius",
e0d3bafd	465	[0xa0 >> 1] = "eeprom",
3f25ffa2 MCC	466	[0xc0 >> 1] = "tuner",
3f25ffa2 MCC	467	[0xc2 >> 1] = "tuner",
e0d3bafd SD	468	};
	469
	470	/*
	471	* cx231xx_do_i2c_scan()
	472	* check i2c address range for devices
	473	*/
	474	void cx231xx_do_i2c_scan(struct cx231xx dev, struct i2c_client c)
	475	{
	476	unsigned char buf;
	477	int i, rc;
	478
84b5dbf3	479	cx231xx_info(": Checking for I2C devices ..\n");
e0d3bafd SD	480	for (i = 0; i < 128; i++) {
	481	c->addr = i;
	482	rc = i2c_master_recv(c, &buf, 0);
	483	if (rc < 0)
	484	continue;
	485	cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n",
84b5dbf3 MCC	486	dev->name, i << 1,
84b5dbf3 MCC	487	i2c_devs[i] ? i2c_devs[i] : "???");
e0d3bafd	488	}
84b5dbf3	489	cx231xx_info(": Completed Checking for I2C devices.\n");
e0d3bafd SD	490	}
e0d3bafd SD	491
e0d3bafd SD	492	/*
	493	* cx231xx_i2c_register()
	494	* register i2c bus
	495	*/
	496	int cx231xx_i2c_register(struct cx231xx_i2c *bus)
	497	{
84b5dbf3	498	struct cx231xx *dev = bus->dev;
e0d3bafd	499
84b5dbf3	500	BUG_ON(!dev->cx231xx_send_usb_command);
e0d3bafd	501
23ba641a EG	502	bus->i2c_adap = cx231xx_adap_template;
23ba641a EG	503	bus->i2c_client = cx231xx_client_template;
e0d3bafd SD	504	bus->i2c_adap.dev.parent = &dev->udev->dev;
e0d3bafd SD	505
84b5dbf3	506	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
e0d3bafd	507
e0d3bafd	508	bus->i2c_adap.algo_data = bus;
b1196126	509	i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
e0d3bafd SD	510	i2c_add_adapter(&bus->i2c_adap);
	511
	512	bus->i2c_client.adapter = &bus->i2c_adap;
	513
	514	if (0 == bus->i2c_rc) {
e0d3bafd SD	515	if (i2c_scan)
	516	cx231xx_do_i2c_scan(dev, &bus->i2c_client);
	517	} else
	518	cx231xx_warn("%s: i2c bus %d register FAILED\n",
84b5dbf3	519	dev->name, bus->nr);
e0d3bafd SD	520
	521	return bus->i2c_rc;
	522	}
	523
	524	/*
	525	* cx231xx_i2c_unregister()
	526	* unregister i2c_bus
	527	*/
	528	int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
	529	{
	530	i2c_del_adapter(&bus->i2c_adap);
	531	return 0;
	532	}