[deliverable/linux.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;
				dev->xc_fw_load_done = 1;	/* FW Loading is done */
				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 W R I T E : 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 to 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 interface */
				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, subaddr 0x%x, leng %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;

	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");
				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 < 2)) {
			/* 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");
	}

	return num;
      err:
	dprintk2(2, " ERROR: %i\n", rc);
	return rc;
}

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

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

/*
 * attach_inform()
 * gets called when a device attaches to the i2c bus
 * does some basic configuration
 */
static int attach_inform(struct i2c_client *client)
{
	struct cx231xx_i2c *bus = i2c_get_adapdata(client->adapter);
	struct cx231xx *dev = bus->dev;

	switch (client->addr << 1) {
	case 0x32:
		dprintk1(1, "attach_inform: Geminit III detected.\n");
		break;
	case 0x02:
		dprintk1(1, "attach_inform: Acquarius detected.\n");
		break;
	case 0xa0:
		dprintk1(1, "attach_inform: eeprom detected.\n");
		break;
	case 0x60:
		dprintk1(1, "attach_inform: Colibri detected.\n");
		break;
	case 0x8e:
		{
			struct IR_i2c *ir = i2c_get_clientdata(client);
			dprintk1(1, "attach_inform: IR detected (%s).\n",
				 ir->phys);
			cx231xx_set_ir(dev, ir);
			break;
		}
	case 0x80:
	case 0x88:
		dprintk1(1, "attach_inform: Hammerhead detected.\n");
		break;

	default:
		if (!dev->tuner_addr)
			dev->tuner_addr = client->addr;

		dprintk1(1, "attach inform: detected I2C address %x\n",
			 client->addr << 1);
	}

	return 0;
}

static int detach_inform(struct i2c_client *client)
{
	dprintk1(1, "i2c detach [client=%s]\n", client->name);
	return 0;
}

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

static struct i2c_adapter cx231xx_adap_template = {
	.owner = THIS_MODULE,
	.class = I2C_CLASS_TV_ANALOG,
	.name = "cx231xx",
	.id = I2C_HW_B_CX231XX,
	.algo = &cx231xx_algo,
	.client_register = attach_inform,
	.client_unregister = detach_inform,
};

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_call_clients()
 * send commands to all attached i2c devices
 */
void cx231xx_i2c_call_clients(struct cx231xx_i2c *bus, unsigned int cmd,
			      void *arg)
{
	/* struct cx231xx *dev = bus->dev; */

	BUG_ON(NULL == bus->i2c_adap.algo_data);
	i2c_clients_command(&bus->i2c_adap, cmd, arg);
}

/*
 * 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);

	cx231xx_info("%s(bus = %d)\n", __func__, bus->nr);

	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, bus);
	i2c_add_adapter(&bus->i2c_adap);

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

	if (0 == bus->i2c_rc) {
		cx231xx_info("%s: i2c bus %d registered\n", dev->name, bus->nr);
		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>
84b5dbf3 MCC	5	Based on em28xx driver
84b5dbf3 MCC	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) { \
	45	printk(fmt, ##args); \
	46	} \
	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 */
	80
	81	/* Just writing sub address will cause problem to XC5000
	82	So ignore the request */
	83	return 0;
	84
	85	} else if (size == 4) { /* register write with sub addr */
	86
	87	if (msg->len >= 2)
	88	saddr = msg->buf[0] << 8 \| msg->buf[1];
	89	else if (msg->len == 1)
	90	saddr = msg->buf[0];
	91
	92	switch (saddr) {
	93	case 0x0000: /* start tuner calibration mode */
	94	need_gpio = 1;
	95	dev->xc_fw_load_done = 1; /* FW Loading is done */
	96	break;
	97	case 0x000D: /* Set signal source */
	98	case 0x0001: /* Set TV standard - Video */
	99	case 0x0002: /* Set TV standard - Audio */
	100	case 0x0003: /* Set RF Frequency */
	101	need_gpio = 1;
	102	break;
	103	default:
	104	if (dev->xc_fw_load_done)
	105	need_gpio = 1;
	106	break;
	107	}
	108
	109	if (need_gpio) {
	110	dprintk1(1,
	111	" GPIO W R I T E : addr 0x%x, len %d, saddr 0x%x\n",
	112	msg->addr, msg->len, saddr);
	113
	114	return dev->cx231xx_gpio_i2c_write(dev,
	115	msg->addr,
	116	msg->buf,
	117	msg->len);
	118	}
	119
	120	}
	121
	122	/* special case for Xc5000 tuner case */
	123	saddr_len = 1;
	124
	125	/* adjust the length to correct length */
	126	size -= saddr_len;
	127	buf_ptr = (u8 *) (msg->buf + 1);
	128
129	do {
130	/* prepare xfer_data struct */
131	req_data.dev_addr = msg->addr;
132	req_data.direction = msg->flags;
133	req_data.saddr_len = saddr_len;
134	req_data.saddr_dat = msg->buf[0];
135	req_data.buf_size = size > 16 ? 16 : size;
136	req_data.p_buffer = (u8 ) (buf_ptr + loop 16);
137
138	bus->i2c_nostop = (size > 16) ? 1 : 0;
139	bus->i2c_reserve = (loop == 0) ? 0 : 1;
140
141	/* usb send command */
142	status = dev->cx231xx_send_usb_command(bus, &req_data);
143	loop++;
144
145	if (size >= 16)
146	size -= 16;
147	else
148	size = 0;
149
150	} while (size > 0);
151
152	bus->i2c_nostop = 0;
153	bus->i2c_reserve = 0;
154
155	} else { /* regular case */
156
157	/* prepare xfer_data struct */
158	req_data.dev_addr = msg->addr;
159	req_data.direction = msg->flags;
160	req_data.saddr_len = 0;
161	req_data.saddr_dat = 0;
162	req_data.buf_size = msg->len;
163	req_data.p_buffer = msg->buf;
164
165	/* usb send command */
166	status = dev->cx231xx_send_usb_command(bus, &req_data);
167	}
168
169	return status < 0 ? status : 0;
e0d3bafd SD	170	}
	171
	172	/*
	173	* cx231xx_i2c_recv_bytes()
	174	* read a byte from the i2c device
	175	*/
	176	static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,
84b5dbf3	177	const struct i2c_msg *msg)
e0d3bafd	178	{
84b5dbf3	179	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	180	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	181	struct cx231xx_i2c_xfer_data req_data;
	182	int status = 0;
	183	u16 saddr = 0;
	184	u8 need_gpio = 0;
	185
	186	if ((bus->nr == 1) && (msg->addr == 0x61)
	187	&& dev->tuner_type == TUNER_XC5000) {
	188
	189	if (msg->len == 2)
	190	saddr = msg->buf[0] << 8 \| msg->buf[1];
	191	else if (msg->len == 1)
	192	saddr = msg->buf[0];
	193
	194	if (dev->xc_fw_load_done) {
	195
	196	switch (saddr) {
	197	case 0x0009: /* BUSY check */
	198	dprintk1(1,
	199	" GPIO R E A D : Special case BUSY check \n");
	200	/* Try to read BUSY register, just set it to zero */
	201	msg->buf[0] = 0;
	202	if (msg->len == 2)
	203	msg->buf[1] = 0;
	204	return 0;
	205	case 0x0004: /* read Lock status */
	206	need_gpio = 1;
	207	break;
	208
	209	}
	210
	211	if (need_gpio) {
	212	/* this is a special case to handle Xceive tuner clock stretch issue
	213	with gpio based I2C interface */
	214	dprintk1(1,
	215	" GPIO R E A D : addr 0x%x, len %d, saddr 0x%x\n",
	216	msg->addr, msg->len,
	217	msg->buf[0] << 8 \| msg->buf[1]);
	218	status =
	219	dev->cx231xx_gpio_i2c_write(dev, msg->addr,
	220	msg->buf,
	221	msg->len);
	222	status =
	223	dev->cx231xx_gpio_i2c_read(dev, msg->addr,
	224	msg->buf,
	225	msg->len);
	226	return status;
	227	}
	228	}
	229
	230	/* prepare xfer_data struct */
	231	req_data.dev_addr = msg->addr;
	232	req_data.direction = msg->flags;
	233	req_data.saddr_len = msg->len;
	234	req_data.saddr_dat = msg->buf[0] << 8 \| msg->buf[1];
	235	req_data.buf_size = msg->len;
	236	req_data.p_buffer = msg->buf;
	237
	238	/* usb send command */
	239	status = dev->cx231xx_send_usb_command(bus, &req_data);
	240
	241	} else {
	242
	243	/* prepare xfer_data struct */
	244	req_data.dev_addr = msg->addr;
245	req_data.direction = msg->flags;
246	req_data.saddr_len = 0;
247	req_data.saddr_dat = 0;
248	req_data.buf_size = msg->len;
249	req_data.p_buffer = msg->buf;
250
251	/* usb send command */
252	status = dev->cx231xx_send_usb_command(bus, &req_data);
253	}
254
255	return status < 0 ? status : 0;
e0d3bafd SD	256	}
	257
	258	/*
	259	* cx231xx_i2c_recv_bytes_with_saddr()
	260	* read a byte from the i2c device
	261	*/
	262	static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,
84b5dbf3 MCC	263	const struct i2c_msg *msg1,
84b5dbf3 MCC	264	const struct i2c_msg *msg2)
e0d3bafd	265	{
84b5dbf3	266	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	267	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	268	struct cx231xx_i2c_xfer_data req_data;
	269	int status = 0;
	270	u16 saddr = 0;
	271	u8 need_gpio = 0;
	272
	273	if (msg1->len == 2)
	274	saddr = msg1->buf[0] << 8 \| msg1->buf[1];
	275	else if (msg1->len == 1)
	276	saddr = msg1->buf[0];
	277
	278	if ((bus->nr == 1) && (msg2->addr == 0x61)
	279	&& dev->tuner_type == TUNER_XC5000) {
	280
	281	if ((msg2->len < 16)) {
	282
	283	dprintk1(1,
	284	" i2c_read : addr 0x%x, len %d, subaddr 0x%x, leng %d\n",
	285	msg2->addr, msg2->len, saddr, msg1->len);
	286
	287	switch (saddr) {
	288	case 0x0008: /* read FW load status */
	289	need_gpio = 1;
	290	break;
	291	case 0x0004: /* read Lock status */
	292	need_gpio = 1;
	293	break;
	294	}
	295
	296	if (need_gpio) {
	297	status =
	298	dev->cx231xx_gpio_i2c_write(dev, msg1->addr,
	299	msg1->buf,
	300	msg1->len);
	301	status =
	302	dev->cx231xx_gpio_i2c_read(dev, msg2->addr,
	303	msg2->buf,
	304	msg2->len);
	305	return status;
	306	}
	307	}
	308	}
	309
	310	/* prepare xfer_data struct */
	311	req_data.dev_addr = msg2->addr;
	312	req_data.direction = msg2->flags;
	313	req_data.saddr_len = msg1->len;
	314	req_data.saddr_dat = saddr;
	315	req_data.buf_size = msg2->len;
	316	req_data.p_buffer = msg2->buf;
	317
	318	/* usb send command */
	319	status = dev->cx231xx_send_usb_command(bus, &req_data);
	320
	321	return status < 0 ? status : 0;
e0d3bafd SD	322	}
	323
	324	/*
	325	* cx231xx_i2c_check_for_device()
	326	* check if there is a i2c_device at the supplied address
	327	*/
	328	static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,
84b5dbf3	329	const struct i2c_msg *msg)
e0d3bafd	330	{
84b5dbf3	331	struct cx231xx_i2c *bus = i2c_adap->algo_data;
e0d3bafd	332	struct cx231xx *dev = bus->dev;
84b5dbf3 MCC	333	struct cx231xx_i2c_xfer_data req_data;
84b5dbf3 MCC	334	int status = 0;
e0d3bafd	335
84b5dbf3 MCC	336	/* prepare xfer_data struct */
	337	req_data.dev_addr = msg->addr;
	338	req_data.direction = msg->flags;
	339	req_data.saddr_len = 0;
	340	req_data.saddr_dat = 0;
	341	req_data.buf_size = 0;
	342	req_data.p_buffer = NULL;
e0d3bafd	343
84b5dbf3 MCC	344	/* usb send command */
84b5dbf3 MCC	345	status = dev->cx231xx_send_usb_command(bus, &req_data);
e0d3bafd	346
84b5dbf3	347	return status < 0 ? status : 0;
e0d3bafd SD	348	}
	349
	350	/*
	351	* cx231xx_i2c_xfer()
	352	* the main i2c transfer function
	353	*/
	354	static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap,
84b5dbf3	355	struct i2c_msg msgs[], int num)
e0d3bafd SD	356	{
	357	struct cx231xx_i2c *bus = i2c_adap->algo_data;
	358	struct cx231xx *dev = bus->dev;
	359	int addr, rc, i, byte;
	360
	361	if (num <= 0)
	362	return 0;
	363
	364	for (i = 0; i < num; i++) {
	365
	366	addr = msgs[i].addr >> 1;
	367
	368	dprintk2(2, "%s %s addr=%x len=%d:",
	369	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
	370	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
84b5dbf3	371	if (!msgs[i].len) { /* 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");
	375	return rc;
	376	}
	377
	378	} else if (msgs[i].flags & I2C_M_RD) {
	379	/* read bytes */
	380	rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]);
	381	if (i2c_debug >= 2) {
	382	for (byte = 0; byte < msgs[i].len; byte++)
	383	printk(" %02x", msgs[i].buf[byte]);
	384	}
	385	} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
84b5dbf3 MCC	386	msgs[i].addr == msgs[i + 1].addr
84b5dbf3 MCC	387	&& (msgs[i].len <= 2) && (bus->nr < 2)) {
e0d3bafd	388	/* read bytes */
84b5dbf3 MCC	389	rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap,
	390	&msgs[i],
	391	&msgs[i + 1]);
e0d3bafd SD	392	if (i2c_debug >= 2) {
	393	for (byte = 0; byte < msgs[i].len; byte++)
	394	printk(" %02x", msgs[i].buf[byte]);
	395	}
84b5dbf3	396	i++;
e0d3bafd SD	397	} else {
	398	/* write bytes */
	399	if (i2c_debug >= 2) {
	400	for (byte = 0; byte < msgs[i].len; byte++)
	401	printk(" %02x", msgs[i].buf[byte]);
	402	}
84b5dbf3	403	rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]);
e0d3bafd SD	404	}
	405	if (rc < 0)
	406	goto err;
	407	if (i2c_debug >= 2)
	408	printk("\n");
	409	}
	410
	411	return num;
84b5dbf3	412	err:
e0d3bafd SD	413	dprintk2(2, " ERROR: %i\n", rc);
	414	return rc;
	415	}
	416
	417	/* ----------------------------------------------------------- */
	418
	419	/*
	420	* functionality()
	421	*/
	422	static u32 functionality(struct i2c_adapter *adap)
	423	{
	424	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_I2C;
	425	}
	426
	427	/*
	428	* attach_inform()
	429	* gets called when a device attaches to the i2c bus
	430	* does some basic configuration
	431	*/
	432	static int attach_inform(struct i2c_client *client)
	433	{
84b5dbf3	434	struct cx231xx_i2c *bus = i2c_get_adapdata(client->adapter);
e0d3bafd SD	435	struct cx231xx *dev = bus->dev;
	436
	437	switch (client->addr << 1) {
	438	case 0x32:
	439	dprintk1(1, "attach_inform: Geminit III detected.\n");
	440	break;
	441	case 0x02:
	442	dprintk1(1, "attach_inform: Acquarius detected.\n");
	443	break;
	444	case 0xa0:
	445	dprintk1(1, "attach_inform: eeprom detected.\n");
	446	break;
	447	case 0x60:
84b5dbf3	448	dprintk1(1, "attach_inform: Colibri detected.\n");
e0d3bafd	449	break;
84b5dbf3 MCC	450	case 0x8e:
	451	{
	452	struct IR_i2c *ir = i2c_get_clientdata(client);
	453	dprintk1(1, "attach_inform: IR detected (%s).\n",
	454	ir->phys);
	455	cx231xx_set_ir(dev, ir);
	456	break;
	457	}
e0d3bafd SD	458	case 0x80:
	459	case 0x88:
	460	dprintk1(1, "attach_inform: Hammerhead detected.\n");
	461	break;
	462
	463	default:
	464	if (!dev->tuner_addr)
	465	dev->tuner_addr = client->addr;
	466
	467	dprintk1(1, "attach inform: detected I2C address %x\n",
84b5dbf3	468	client->addr << 1);
e0d3bafd SD	469	}
	470
	471	return 0;
	472	}
	473
	474	static int detach_inform(struct i2c_client *client)
	475	{
	476	dprintk1(1, "i2c detach [client=%s]\n", client->name);
	477	return 0;
	478	}
	479
e0d3bafd	480	static struct i2c_algorithm cx231xx_algo = {
84b5dbf3	481	.master_xfer = cx231xx_i2c_xfer,
e0d3bafd SD	482	.functionality = functionality,
	483	};
	484
	485	static struct i2c_adapter cx231xx_adap_template = {
	486	.owner = THIS_MODULE,
	487	.class = I2C_CLASS_TV_ANALOG,
	488	.name = "cx231xx",
	489	.id = I2C_HW_B_CX231XX,
	490	.algo = &cx231xx_algo,
84b5dbf3	491	.client_register = attach_inform,
e0d3bafd SD	492	.client_unregister = detach_inform,
	493	};
	494
	495	static struct i2c_client cx231xx_client_template = {
	496	.name = "cx231xx internal",
	497	};
	498
	499	/* ----------------------------------------------------------- */
	500
	501	/*
	502	* i2c_devs
	503	* incomplete list of known devices
	504	*/
	505	static char *i2c_devs[128] = {
	506	[0x60 >> 1] = "colibri",
	507	[0x88 >> 1] = "hammerhead",
84b5dbf3	508	[0x8e >> 1] = "CIR",
e0d3bafd	509	[0x32 >> 1] = "GeminiIII",
84b5dbf3	510	[0x02 >> 1] = "Aquarius",
e0d3bafd SD	511	[0xa0 >> 1] = "eeprom",
	512	[0xc0 >> 1] = "tuner/XC3028",
	513	[0xc2 >> 1] = "tuner/XC5000",
	514	};
	515
	516	/*
	517	* cx231xx_do_i2c_scan()
	518	* check i2c address range for devices
	519	*/
	520	void cx231xx_do_i2c_scan(struct cx231xx dev, struct i2c_client c)
	521	{
	522	unsigned char buf;
	523	int i, rc;
	524
84b5dbf3	525	cx231xx_info(": Checking for I2C devices ..\n");
e0d3bafd SD	526	for (i = 0; i < 128; i++) {
	527	c->addr = i;
	528	rc = i2c_master_recv(c, &buf, 0);
	529	if (rc < 0)
	530	continue;
	531	cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n",
84b5dbf3 MCC	532	dev->name, i << 1,
84b5dbf3 MCC	533	i2c_devs[i] ? i2c_devs[i] : "???");
e0d3bafd	534	}
84b5dbf3	535	cx231xx_info(": Completed Checking for I2C devices.\n");
e0d3bafd SD	536	}
	537
	538	/*
	539	* cx231xx_i2c_call_clients()
	540	* send commands to all attached i2c devices
	541	*/
84b5dbf3 MCC	542	void cx231xx_i2c_call_clients(struct cx231xx_i2c *bus, unsigned int cmd,
84b5dbf3 MCC	543	void *arg)
e0d3bafd SD	544	{
	545	/* struct cx231xx dev = bus->dev; /
	546
	547	BUG_ON(NULL == bus->i2c_adap.algo_data);
	548	i2c_clients_command(&bus->i2c_adap, cmd, arg);
	549	}
	550
	551	/*
	552	* cx231xx_i2c_register()
	553	* register i2c bus
	554	*/
	555	int cx231xx_i2c_register(struct cx231xx_i2c *bus)
	556	{
84b5dbf3	557	struct cx231xx *dev = bus->dev;
e0d3bafd	558
84b5dbf3	559	BUG_ON(!dev->cx231xx_send_usb_command);
e0d3bafd	560
84b5dbf3	561	cx231xx_info("%s(bus = %d)\n", __func__, bus->nr);
e0d3bafd	562
84b5dbf3 MCC	563	memcpy(&bus->i2c_adap, &cx231xx_adap_template, sizeof(bus->i2c_adap));
84b5dbf3 MCC	564	memcpy(&bus->i2c_algo, &cx231xx_algo, sizeof(bus->i2c_algo));
e0d3bafd SD	565	memcpy(&bus->i2c_client, &cx231xx_client_template,
	566	sizeof(bus->i2c_client));
	567
	568	bus->i2c_adap.dev.parent = &dev->udev->dev;
	569
84b5dbf3	570	strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name));
e0d3bafd SD	571
	572	bus->i2c_algo.data = bus;
	573	bus->i2c_adap.algo_data = bus;
	574	i2c_set_adapdata(&bus->i2c_adap, bus);
	575	i2c_add_adapter(&bus->i2c_adap);
	576
	577	bus->i2c_client.adapter = &bus->i2c_adap;
	578
	579	if (0 == bus->i2c_rc) {
	580	cx231xx_info("%s: i2c bus %d registered\n", dev->name, bus->nr);
	581	if (i2c_scan)
	582	cx231xx_do_i2c_scan(dev, &bus->i2c_client);
	583	} else
	584	cx231xx_warn("%s: i2c bus %d register FAILED\n",
84b5dbf3	585	dev->name, bus->nr);
e0d3bafd SD	586
	587	return bus->i2c_rc;
	588	}
	589
	590	/*
	591	* cx231xx_i2c_unregister()
	592	* unregister i2c_bus
	593	*/
	594	int cx231xx_i2c_unregister(struct cx231xx_i2c *bus)
	595	{
	596	i2c_del_adapter(&bus->i2c_adap);
	597	return 0;
	598	}