[mirror_ubuntu-kernels.git] / drivers / media / video / em28xx / em28xx-i2c.c

/*
   em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@infradead.org>
		      Sascha Sommer <saschasommer@freenet.de>

   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 <linux/video_decoder.h>

#include "em28xx.h"
#include "tuner-xc2028.h"
#include <media/v4l2-common.h>
#include <media/tuner.h>

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

static unsigned int i2c_scan = 0;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");

static unsigned int i2c_debug = 0;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

#define dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\
			printk(fmt, ##args); } while (0)
#define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
			printk(KERN_DEBUG "%s at %s: " fmt, \
			dev->name, __FUNCTION__ , ##args); } while (0)

/*
 * em2800_i2c_send_max4()
 * send up to 4 bytes to the i2c device
 */
static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
				char *buf, int len)
{
	int ret;
	int write_timeout;
	unsigned char b2[6];
	BUG_ON(len < 1 || len > 4);
	b2[5] = 0x80 + len - 1;
	b2[4] = addr;
	b2[3] = buf[0];
	if (len > 1)
		b2[2] = buf[1];
	if (len > 2)
		b2[1] = buf[2];
	if (len > 3)
		b2[0] = buf[3];

	ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
	if (ret != 2 + len) {
		em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
		return -EIO;
	}
	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	     write_timeout -= 5) {
		ret = dev->em28xx_read_reg(dev, 0x05);
		if (ret == 0x80 + len - 1)
			return len;
		msleep(5);
	}
	em28xx_warn("i2c write timed out\n");
	return -EIO;
}

/*
 * em2800_i2c_send_bytes()
 */
static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf,
				 short len)
{
	char *bufPtr = buf;
	int ret;
	int wrcount = 0;
	int count;
	int maxLen = 4;
	struct em28xx *dev = (struct em28xx *)data;
	while (len > 0) {
		count = (len > maxLen) ? maxLen : len;
		ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
		if (ret > 0) {
			len -= count;
			bufPtr += count;
			wrcount += count;
		} else
			return (ret < 0) ? ret : -EFAULT;
	}
	return wrcount;
}

/*
 * em2800_i2c_check_for_device()
 * check if there is a i2c_device at the supplied address
 */
static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
{
	char msg;
	int ret;
	int write_timeout;
	msg = addr;
	ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
	if (ret < 0) {
		em28xx_warn("setting i2c device address failed (error=%i)\n",
			    ret);
		return ret;
	}
	msg = 0x84;
	ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
	if (ret < 0) {
		em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
		return ret;
	}
	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	     write_timeout -= 5) {
		unsigned msg = dev->em28xx_read_reg(dev, 0x5);
		if (msg == 0x94)
			return -ENODEV;
		else if (msg == 0x84)
			return 0;
		msleep(5);
	}
	return -ENODEV;
}

/*
 * em2800_i2c_recv_bytes()
 * read from the i2c device
 */
static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
				 char *buf, int len)
{
	int ret;
	/* check for the device and set i2c read address */
	ret = em2800_i2c_check_for_device(dev, addr);
	if (ret) {
		em28xx_warn
		    ("preparing read at i2c address 0x%x failed (error=%i)\n",
		     addr, ret);
		return ret;
	}
	ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
	if (ret < 0) {
		em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
			    addr, ret);
		return ret;
	}
	return ret;
}

/*
 * em28xx_i2c_send_bytes()
 * untested for more than 4 bytes
 */
static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf,
				 short len, int stop)
{
	int wrcount = 0;
	struct em28xx *dev = (struct em28xx *)data;

	wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);

	return wrcount;
}

/*
 * em28xx_i2c_recv_bytes()
 * read a byte from the i2c device
 */
static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
				 char *buf, int len)
{
	int ret;
	ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
	if (ret < 0) {
		em28xx_warn("reading i2c device failed (error=%i)\n", ret);
		return ret;
	}
	if (dev->em28xx_read_reg(dev, 0x5) != 0)
		return -ENODEV;
	return ret;
}

/*
 * em28xx_i2c_check_for_device()
 * check if there is a i2c_device at the supplied address
 */
static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
{
	char msg;
	int ret;
	msg = addr;

	ret = dev->em28xx_read_reg_req(dev, 2, addr);
	if (ret < 0) {
		em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
		return ret;
	}
	if (dev->em28xx_read_reg(dev, 0x5) != 0)
		return -ENODEV;
	return 0;
}

/*
 * em28xx_i2c_xfer()
 * the main i2c transfer function
 */
static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
			   struct i2c_msg msgs[], int num)
{
	struct em28xx *dev = i2c_adap->algo_data;
	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 */
			if (dev->is_em2800)
				rc = em2800_i2c_check_for_device(dev, addr);
			else
				rc = em28xx_i2c_check_for_device(dev, addr);
			if (rc < 0) {
				dprintk2(2," no device\n");
				return rc;
			}

		} else if (msgs[i].flags & I2C_M_RD) {
			/* read bytes */
			if (dev->is_em2800)
				rc = em2800_i2c_recv_bytes(dev, addr,
							   msgs[i].buf,
							   msgs[i].len);
			else
				rc = em28xx_i2c_recv_bytes(dev, addr,
							   msgs[i].buf,
							   msgs[i].len);
			if (i2c_debug>=2) {
				for (byte = 0; byte < msgs[i].len; byte++) {
					printk(" %02x", msgs[i].buf[byte]);
				}
			}
		} else {
			/* write bytes */
			if (i2c_debug>=2) {
				for (byte = 0; byte < msgs[i].len; byte++)
					printk(" %02x", msgs[i].buf[byte]);
			}
			if (dev->is_em2800)
				rc = em2800_i2c_send_bytes(dev, addr,
							   msgs[i].buf,
							   msgs[i].len);
			else
				rc = em28xx_i2c_send_bytes(dev, addr,
							   msgs[i].buf,
							   msgs[i].len,
							   i == num - 1);
		}
		if (rc < 0)
			goto err;
		if (i2c_debug>=2)
			printk("\n");
	}

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

/* based on linux/sunrpc/svcauth.h and linux/hash.h
 * The original hash function returns a different value, if arch is x86_64
 *  or i386.
 */
static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
{
	unsigned long hash = 0;
	unsigned long l = 0;
	int len = 0;
	unsigned char c;
	do {
		if (len == length) {
			c = (char)len;
			len = -1;
		} else
			c = *buf++;
		l = (l << 8) | c;
		len++;
		if ((len & (32 / 8 - 1)) == 0)
			hash = ((hash^l) * 0x9e370001UL);
	} while (len);

	return (hash >> (32 - bits)) & 0xffffffffUL;
}

static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
{
	unsigned char buf, *p = eedata;
	struct em28xx_eeprom *em_eeprom = (void *)eedata;
	int i, err, size = len, block;

	dev->i2c_client.addr = 0xa0 >> 1;

	/* Check if board has eeprom */
	err = i2c_master_recv(&dev->i2c_client, &buf, 0);
	if (err < 0)
		return -1;

	buf = 0;
	if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
		printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
		       dev->name, err);
		return -1;
	}
	while (size > 0) {
		if (size > 16)
			block = 16;
		else
			block = size;

		if (block !=
		    (err = i2c_master_recv(&dev->i2c_client, p, block))) {
			printk(KERN_WARNING
			       "%s: i2c eeprom read error (err=%d)\n",
			       dev->name, err);
			return -1;
		}
		size -= block;
		p += block;
	}
	for (i = 0; i < len; i++) {
		if (0 == (i % 16))
			printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
		printk(" %02x", eedata[i]);
		if (15 == (i % 16))
			printk("\n");
	}

	if (em_eeprom->id == 0x9567eb1a)
		dev->hash = em28xx_hash_mem(eedata, len, 32);

	printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n",
	       em_eeprom->id, dev->hash);
	printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
	       em_eeprom->product_ID);

	switch (em_eeprom->chip_conf >> 4 & 0x3) {
	case 0:
		printk(KERN_INFO "No audio on board.\n");
		break;
	case 1:
		printk(KERN_INFO "AC97 audio (5 sample rates)\n");
		break;
	case 2:
		printk(KERN_INFO "I2S audio, sample rate=32k\n");
		break;
	case 3:
		printk(KERN_INFO "I2S audio, 3 sample rates\n");
		break;
	}

	if (em_eeprom->chip_conf & 1 << 3)
		printk(KERN_INFO "USB Remote wakeup capable\n");

	if (em_eeprom->chip_conf & 1 << 2)
		printk(KERN_INFO "USB Self power capable\n");

	switch (em_eeprom->chip_conf & 0x3) {
	case 0:
		printk(KERN_INFO "500mA max power\n");
		break;
	case 1:
		printk(KERN_INFO "400mA max power\n");
		break;
	case 2:
		printk(KERN_INFO "300mA max power\n");
		break;
	case 3:
		printk(KERN_INFO "200mA max power\n");
		break;
	}
	printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
				em_eeprom->string_idx_table,em_eeprom->string1,
				em_eeprom->string2,em_eeprom->string3);

	return 0;
}

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

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


/*
 * 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 em28xx *dev = client->adapter->algo_data;

	switch (client->addr << 1) {
		case 0x86:
		case 0x84:
		case 0x96:
		case 0x94:
		{
			struct v4l2_priv_tun_config tda9887_cfg;

			struct tuner_setup tun_setup;

			tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
			tun_setup.type = TUNER_TDA9887;
			tun_setup.addr = client->addr;

			em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);

			tda9887_cfg.tuner = TUNER_TDA9887;
			tda9887_cfg.priv = &dev->tda9887_conf;
			em28xx_i2c_call_clients(dev, TUNER_SET_CONFIG,
						&tda9887_cfg);
			break;
		}
		case 0x42:
			dprintk1(1,"attach_inform: saa7114 detected.\n");
			break;
		case 0x4a:
			dprintk1(1,"attach_inform: saa7113 detected.\n");
			break;
		case 0xa0:
			dprintk1(1,"attach_inform: eeprom detected.\n");
			break;
		case 0x60:
		case 0x8e:
		{
			struct IR_i2c *ir = i2c_get_clientdata(client);
			dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
			em28xx_set_ir(dev,ir);
			break;
		}
		case 0x80:
		case 0x88:
			dprintk1(1,"attach_inform: msp34xx detected.\n");
			break;
		case 0xb8:
		case 0xba:
			dprintk1(1,"attach_inform: tvp5150 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 struct i2c_algorithm em28xx_algo = {
	.master_xfer   = em28xx_i2c_xfer,
	.functionality = functionality,
};

static struct i2c_adapter em28xx_adap_template = {
	.owner = THIS_MODULE,
	.class = I2C_CLASS_TV_ANALOG,
	.name = "em28xx",
	.id = I2C_HW_B_EM28XX,
	.algo = &em28xx_algo,
	.client_register = attach_inform,
};

static struct i2c_client em28xx_client_template = {
	.name = "em28xx internal",
};

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

/*
 * i2c_devs
 * incomplete list of known devices
 */
static char *i2c_devs[128] = {
	[0x4a >> 1] = "saa7113h",
	[0x60 >> 1] = "remote IR sensor",
	[0x8e >> 1] = "remote IR sensor",
	[0x86 >> 1] = "tda9887",
	[0x80 >> 1] = "msp34xx",
	[0x88 >> 1] = "msp34xx",
	[0xa0 >> 1] = "eeprom",
	[0xb8 >> 1] = "tvp5150a",
	[0xba >> 1] = "tvp5150a",
	[0xc0 >> 1] = "tuner (analog)",
	[0xc2 >> 1] = "tuner (analog)",
	[0xc4 >> 1] = "tuner (analog)",
	[0xc6 >> 1] = "tuner (analog)",
};

/*
 * do_i2c_scan()
 * check i2c address range for devices
 */
void em28xx_do_i2c_scan(struct em28xx *dev)
{
	u8 i2c_devicelist[128];
	unsigned char buf;
	int i, rc;

	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));

	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
		dev->i2c_client.addr = i;
		rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
		if (rc < 0)
			continue;
		i2c_devicelist[i] = i;
		printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
		       dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
	}

	dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
					ARRAY_SIZE(i2c_devicelist), 32);
}

/*
 * em28xx_i2c_call_clients()
 * send commands to all attached i2c devices
 */
void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg)
{
	BUG_ON(NULL == dev->i2c_adap.algo_data);
	i2c_clients_command(&dev->i2c_adap, cmd, arg);
}

/*
 * em28xx_i2c_register()
 * register i2c bus
 */
int em28xx_i2c_register(struct em28xx *dev)
{
	BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
	BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
	dev->i2c_adap = em28xx_adap_template;
	dev->i2c_adap.dev.parent = &dev->udev->dev;
	strcpy(dev->i2c_adap.name, dev->name);
	dev->i2c_adap.algo_data = dev;
	i2c_add_adapter(&dev->i2c_adap);

	dev->i2c_client = em28xx_client_template;
	dev->i2c_client.adapter = &dev->i2c_adap;

	em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));

	if (i2c_scan)
		em28xx_do_i2c_scan(dev);
	return 0;
}

/*
 * em28xx_i2c_unregister()
 * unregister i2c_bus
 */
int em28xx_i2c_unregister(struct em28xx *dev)
{
	i2c_del_adapter(&dev->i2c_adap);
	return 0;
}
Commit	Line	Data
a6c2ba28	1	/*
f7abcd38	2	em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
a6c2ba28	3
f7abcd38 MCC	4	Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
f7abcd38 MCC	5	Markus Rechberger <mrechberger@gmail.com>
2e7c6dc3	6	Mauro Carvalho Chehab <mchehab@infradead.org>
f7abcd38	7	Sascha Sommer <saschasommer@freenet.de>
a6c2ba28	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
	21	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/kernel.h>
	26	#include <linux/usb.h>
	27	#include <linux/i2c.h>
a6c2ba28	28	#include <linux/video_decoder.h>
a6c2ba28	29
f7abcd38	30	#include "em28xx.h"
6c362c8e	31	#include "tuner-xc2028.h"
5e453dc7	32	#include <media/v4l2-common.h>
d5e52653	33	#include <media/tuner.h>
a6c2ba28	34
	35	/* ----------------------------------------------------------- */
	36
	37	static unsigned int i2c_scan = 0;
	38	module_param(i2c_scan, int, 0444);
	39	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	40
	41	static unsigned int i2c_debug = 0;
	42	module_param(i2c_debug, int, 0644);
	43	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	44
d5e52653	45	#define dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\
674434c6	46	printk(fmt, ##args); } while (0)
d5e52653 MCC	47	#define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
d5e52653 MCC	48	printk(KERN_DEBUG "%s at %s: " fmt, \
f85c657f	49	dev->name, __FUNCTION__ , ##args); } while (0)
a6c2ba28	50
a6c2ba28	51	/*
596d92d5 MCC	52	* em2800_i2c_send_max4()
	53	* send up to 4 bytes to the i2c device
	54	*/
3acf2809	55	static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	56	char *buf, int len)
	57	{
	58	int ret;
	59	int write_timeout;
	60	unsigned char b2[6];
	61	BUG_ON(len < 1 \|\| len > 4);
	62	b2[5] = 0x80 + len - 1;
	63	b2[4] = addr;
	64	b2[3] = buf[0];
	65	if (len > 1)
	66	b2[2] = buf[1];
	67	if (len > 2)
	68	b2[1] = buf[2];
	69	if (len > 3)
	70	b2[0] = buf[3];
	71
3acf2809	72	ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
596d92d5	73	if (ret != 2 + len) {
beb7dd86	74	em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
596d92d5 MCC	75	return -EIO;
	76	}
	77	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	78	write_timeout -= 5) {
3acf2809	79	ret = dev->em28xx_read_reg(dev, 0x05);
596d92d5 MCC	80	if (ret == 0x80 + len - 1)
596d92d5 MCC	81	return len;
e8e41da4	82	msleep(5);
596d92d5	83	}
3acf2809	84	em28xx_warn("i2c write timed out\n");
596d92d5 MCC	85	return -EIO;
	86	}
	87
	88	/*
	89	* em2800_i2c_send_bytes()
	90	*/
	91	static int em2800_i2c_send_bytes(void data, unsigned char addr, char buf,
	92	short len)
	93	{
	94	char *bufPtr = buf;
	95	int ret;
	96	int wrcount = 0;
	97	int count;
	98	int maxLen = 4;
3acf2809	99	struct em28xx dev = (struct em28xx )data;
596d92d5 MCC	100	while (len > 0) {
	101	count = (len > maxLen) ? maxLen : len;
	102	ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
	103	if (ret > 0) {
	104	len -= count;
	105	bufPtr += count;
	106	wrcount += count;
	107	} else
	108	return (ret < 0) ? ret : -EFAULT;
	109	}
	110	return wrcount;
	111	}
	112
	113	/*
	114	* em2800_i2c_check_for_device()
	115	* check if there is a i2c_device at the supplied address
	116	*/
3acf2809	117	static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
596d92d5 MCC	118	{
	119	char msg;
	120	int ret;
	121	int write_timeout;
	122	msg = addr;
3acf2809	123	ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
596d92d5	124	if (ret < 0) {
3acf2809	125	em28xx_warn("setting i2c device address failed (error=%i)\n",
596d92d5 MCC	126	ret);
	127	return ret;
	128	}
	129	msg = 0x84;
3acf2809	130	ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
596d92d5	131	if (ret < 0) {
3acf2809	132	em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
596d92d5 MCC	133	return ret;
	134	}
	135	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	136	write_timeout -= 5) {
3acf2809	137	unsigned msg = dev->em28xx_read_reg(dev, 0x5);
596d92d5 MCC	138	if (msg == 0x94)
	139	return -ENODEV;
	140	else if (msg == 0x84)
	141	return 0;
e8e41da4	142	msleep(5);
596d92d5 MCC	143	}
	144	return -ENODEV;
	145	}
	146
	147	/*
	148	* em2800_i2c_recv_bytes()
	149	* read from the i2c device
	150	*/
3acf2809	151	static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	152	char *buf, int len)
	153	{
	154	int ret;
	155	/* check for the device and set i2c read address */
	156	ret = em2800_i2c_check_for_device(dev, addr);
	157	if (ret) {
3acf2809	158	em28xx_warn
596d92d5 MCC	159	("preparing read at i2c address 0x%x failed (error=%i)\n",
	160	addr, ret);
	161	return ret;
	162	}
3acf2809	163	ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
596d92d5	164	if (ret < 0) {
3acf2809	165	em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
596d92d5 MCC	166	addr, ret);
	167	return ret;
	168	}
	169	return ret;
	170	}
	171
	172	/*
3acf2809	173	* em28xx_i2c_send_bytes()
a6c2ba28	174	* untested for more than 4 bytes
a6c2ba28	175	*/
3acf2809	176	static int em28xx_i2c_send_bytes(void data, unsigned char addr, char buf,
596d92d5	177	short len, int stop)
a6c2ba28	178	{
a6c2ba28	179	int wrcount = 0;
3acf2809	180	struct em28xx dev = (struct em28xx )data;
a6c2ba28	181
3acf2809	182	wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
a6c2ba28	183
	184	return wrcount;
	185	}
	186
	187	/*
3acf2809	188	* em28xx_i2c_recv_bytes()
a6c2ba28	189	* read a byte from the i2c device
a6c2ba28	190	*/
3acf2809	191	static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5	192	char *buf, int len)
a6c2ba28	193	{
a6c2ba28	194	int ret;
3acf2809	195	ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
a6c2ba28	196	if (ret < 0) {
3acf2809	197	em28xx_warn("reading i2c device failed (error=%i)\n", ret);
a6c2ba28	198	return ret;
a6c2ba28	199	}
3acf2809	200	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28	201	return -ENODEV;
	202	return ret;
	203	}
	204
	205	/*
3acf2809	206	* em28xx_i2c_check_for_device()
a6c2ba28	207	* check if there is a i2c_device at the supplied address
a6c2ba28	208	*/
3acf2809	209	static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
a6c2ba28	210	{
	211	char msg;
	212	int ret;
	213	msg = addr;
	214
3acf2809	215	ret = dev->em28xx_read_reg_req(dev, 2, addr);
a6c2ba28	216	if (ret < 0) {
3acf2809	217	em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
a6c2ba28	218	return ret;
a6c2ba28	219	}
3acf2809	220	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28	221	return -ENODEV;
	222	return 0;
	223	}
	224
	225	/*
3acf2809	226	* em28xx_i2c_xfer()
a6c2ba28	227	* the main i2c transfer function
a6c2ba28	228	*/
3acf2809	229	static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
a6c2ba28	230	struct i2c_msg msgs[], int num)
a6c2ba28	231	{
3acf2809	232	struct em28xx *dev = i2c_adap->algo_data;
a6c2ba28	233	int addr, rc, i, byte;
	234
	235	if (num <= 0)
	236	return 0;
	237	for (i = 0; i < num; i++) {
	238	addr = msgs[i].addr << 1;
d5e52653	239	dprintk2(2,"%s %s addr=%x len=%d:",
a6c2ba28	240	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
	241	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
	242	if (!msgs[i].len) { /* no len: check only for device presence */
596d92d5 MCC	243	if (dev->is_em2800)
	244	rc = em2800_i2c_check_for_device(dev, addr);
	245	else
3acf2809	246	rc = em28xx_i2c_check_for_device(dev, addr);
a6c2ba28	247	if (rc < 0) {
d5e52653	248	dprintk2(2," no device\n");
a6c2ba28	249	return rc;
	250	}
	251
596d92d5	252	} else if (msgs[i].flags & I2C_M_RD) {
a6c2ba28	253	/* read bytes */
596d92d5 MCC	254	if (dev->is_em2800)
	255	rc = em2800_i2c_recv_bytes(dev, addr,
	256	msgs[i].buf,
	257	msgs[i].len);
	258	else
3acf2809	259	rc = em28xx_i2c_recv_bytes(dev, addr,
596d92d5 MCC	260	msgs[i].buf,
596d92d5 MCC	261	msgs[i].len);
d5e52653	262	if (i2c_debug>=2) {
a6c2ba28	263	for (byte = 0; byte < msgs[i].len; byte++) {
	264	printk(" %02x", msgs[i].buf[byte]);
	265	}
	266	}
	267	} else {
	268	/* write bytes */
d5e52653	269	if (i2c_debug>=2) {
a6c2ba28	270	for (byte = 0; byte < msgs[i].len; byte++)
	271	printk(" %02x", msgs[i].buf[byte]);
	272	}
596d92d5 MCC	273	if (dev->is_em2800)
	274	rc = em2800_i2c_send_bytes(dev, addr,
	275	msgs[i].buf,
	276	msgs[i].len);
	277	else
3acf2809	278	rc = em28xx_i2c_send_bytes(dev, addr,
596d92d5 MCC	279	msgs[i].buf,
	280	msgs[i].len,
	281	i == num - 1);
a6c2ba28	282	}
e8e41da4 MR	283	if (rc < 0)
e8e41da4 MR	284	goto err;
d5e52653	285	if (i2c_debug>=2)
a6c2ba28	286	printk("\n");
	287	}
	288
	289	return num;
	290	err:
d5e52653	291	dprintk2(2," ERROR: %i\n", rc);
a6c2ba28	292	return rc;
	293	}
	294
03910cc3 MCC	295	/* based on linux/sunrpc/svcauth.h and linux/hash.h
	296	* The original hash function returns a different value, if arch is x86_64
	297	* or i386.
	298	*/
	299	static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
	300	{
	301	unsigned long hash = 0;
	302	unsigned long l = 0;
	303	int len = 0;
	304	unsigned char c;
	305	do {
	306	if (len == length) {
	307	c = (char)len;
	308	len = -1;
	309	} else
	310	c = *buf++;
	311	l = (l << 8) \| c;
	312	len++;
	313	if ((len & (32 / 8 - 1)) == 0)
	314	hash = ((hash^l) * 0x9e370001UL);
	315	} while (len);
	316
	317	return (hash >> (32 - bits)) & 0xffffffffUL;
	318	}
	319
3acf2809	320	static int em28xx_i2c_eeprom(struct em28xx dev, unsigned char eedata, int len)
a6c2ba28	321	{
a6c2ba28	322	unsigned char buf, *p = eedata;
3acf2809	323	struct em28xx_eeprom em_eeprom = (void )eedata;
a6c2ba28	324	int i, err, size = len, block;
	325
	326	dev->i2c_client.addr = 0xa0 >> 1;
596d92d5 MCC	327
	328	/* Check if board has eeprom */
	329	err = i2c_master_recv(&dev->i2c_client, &buf, 0);
	330	if (err < 0)
	331	return -1;
	332
a6c2ba28	333	buf = 0;
	334	if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
	335	printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
	336	dev->name, err);
	337	return -1;
	338	}
	339	while (size > 0) {
	340	if (size > 16)
	341	block = 16;
	342	else
	343	block = size;
	344
	345	if (block !=
	346	(err = i2c_master_recv(&dev->i2c_client, p, block))) {
	347	printk(KERN_WARNING
	348	"%s: i2c eeprom read error (err=%d)\n",
	349	dev->name, err);
	350	return -1;
	351	}
	352	size -= block;
	353	p += block;
	354	}
	355	for (i = 0; i < len; i++) {
	356	if (0 == (i % 16))
	357	printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
	358	printk(" %02x", eedata[i]);
	359	if (15 == (i % 16))
	360	printk("\n");
	361	}
	362
03910cc3 MCC	363	if (em_eeprom->id == 0x9567eb1a)
	364	dev->hash = em28xx_hash_mem(eedata, len, 32);
	365
	366	printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n",
	367	em_eeprom->id, dev->hash);
a6c2ba28	368	printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
	369	em_eeprom->product_ID);
	370
	371	switch (em_eeprom->chip_conf >> 4 & 0x3) {
	372	case 0:
	373	printk(KERN_INFO "No audio on board.\n");
	374	break;
	375	case 1:
	376	printk(KERN_INFO "AC97 audio (5 sample rates)\n");
	377	break;
	378	case 2:
	379	printk(KERN_INFO "I2S audio, sample rate=32k\n");
	380	break;
	381	case 3:
	382	printk(KERN_INFO "I2S audio, 3 sample rates\n");
	383	break;
	384	}
	385
	386	if (em_eeprom->chip_conf & 1 << 3)
	387	printk(KERN_INFO "USB Remote wakeup capable\n");
	388
	389	if (em_eeprom->chip_conf & 1 << 2)
	390	printk(KERN_INFO "USB Self power capable\n");
	391
	392	switch (em_eeprom->chip_conf & 0x3) {
	393	case 0:
	394	printk(KERN_INFO "500mA max power\n");
	395	break;
	396	case 1:
	397	printk(KERN_INFO "400mA max power\n");
	398	break;
	399	case 2:
	400	printk(KERN_INFO "300mA max power\n");
	401	break;
	402	case 3:
	403	printk(KERN_INFO "200mA max power\n");
	404	break;
	405	}
91cad0f2 MCC	406	printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
	407	em_eeprom->string_idx_table,em_eeprom->string1,
	408	em_eeprom->string2,em_eeprom->string3);
a6c2ba28	409
	410	return 0;
	411	}
	412
	413	/* ----------------------------------------------------------- */
	414
a6c2ba28	415	/*
	416	* functionality()
	417	*/
	418	static u32 functionality(struct i2c_adapter *adap)
	419	{
	420	return I2C_FUNC_SMBUS_EMUL;
	421	}
	422
a6c2ba28	423
a6c2ba28	424	/*
	425	* attach_inform()
	426	* gets called when a device attaches to the i2c bus
	427	* does some basic configuration
	428	*/
	429	static int attach_inform(struct i2c_client *client)
	430	{
3acf2809	431	struct em28xx *dev = client->adapter->algo_data;
a6c2ba28	432
a6c2ba28	433	switch (client->addr << 1) {
8c6da5c4	434	case 0x86:
fe51f819 MCC	435	case 0x84:
	436	case 0x96:
	437	case 0x94:
15396236	438	{
7f171123 MCC	439	struct v4l2_priv_tun_config tda9887_cfg;
7f171123 MCC	440
15396236 MCC	441	struct tuner_setup tun_setup;
	442
	443	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	444	tun_setup.type = TUNER_TDA9887;
	445	tun_setup.addr = client->addr;
	446
	447	em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
7f171123 MCC	448
	449	tda9887_cfg.tuner = TUNER_TDA9887;
	450	tda9887_cfg.priv = &dev->tda9887_conf;
	451	em28xx_i2c_call_clients(dev, TUNER_SET_CONFIG,
	452	&tda9887_cfg);
a9ae9fb1	453	break;
15396236	454	}
30556b23 MR	455	case 0x42:
	456	dprintk1(1,"attach_inform: saa7114 detected.\n");
	457	break;
a9ae9fb1	458	case 0x4a:
d5e52653	459	dprintk1(1,"attach_inform: saa7113 detected.\n");
a9ae9fb1 MR	460	break;
a9ae9fb1 MR	461	case 0xa0:
d5e52653 MCC	462	dprintk1(1,"attach_inform: eeprom detected.\n");
	463	break;
	464	case 0x60:
	465	case 0x8e:
	466	{
	467	struct IR_i2c *ir = i2c_get_clientdata(client);
	468	dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
3acf2809	469	em28xx_set_ir(dev,ir);
a9ae9fb1	470	break;
d5e52653	471	}
a9ae9fb1 MR	472	case 0x80:
a9ae9fb1 MR	473	case 0x88:
d5e52653	474	dprintk1(1,"attach_inform: msp34xx detected.\n");
a9ae9fb1 MR	475	break;
	476	case 0xb8:
	477	case 0xba:
d5e52653	478	dprintk1(1,"attach_inform: tvp5150 detected.\n");
a9ae9fb1	479	break;
15396236	480
a9ae9fb1	481	default:
03910cc3 MCC	482	if (!dev->tuner_addr)
	483	dev->tuner_addr = client->addr;
	484
d5e52653	485	dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1);
03910cc3	486
a6c2ba28	487	}
	488
	489	return 0;
	490	}
	491
3acf2809 MCC	492	static struct i2c_algorithm em28xx_algo = {
3acf2809 MCC	493	.master_xfer = em28xx_i2c_xfer,
a6c2ba28	494	.functionality = functionality,
	495	};
	496
3acf2809	497	static struct i2c_adapter em28xx_adap_template = {
a6c2ba28	498	.owner = THIS_MODULE,
a6c2ba28	499	.class = I2C_CLASS_TV_ANALOG,
3acf2809 MCC	500	.name = "em28xx",
	501	.id = I2C_HW_B_EM28XX,
	502	.algo = &em28xx_algo,
a6c2ba28	503	.client_register = attach_inform,
	504	};
	505
3acf2809 MCC	506	static struct i2c_client em28xx_client_template = {
3acf2809 MCC	507	.name = "em28xx internal",
a6c2ba28	508	};
	509
	510	/* ----------------------------------------------------------- */
	511
	512	/*
	513	* i2c_devs
	514	* incomplete list of known devices
	515	*/
	516	static char *i2c_devs[128] = {
	517	[0x4a >> 1] = "saa7113h",
	518	[0x60 >> 1] = "remote IR sensor",
da45a2a5	519	[0x8e >> 1] = "remote IR sensor",
a6c2ba28	520	[0x86 >> 1] = "tda9887",
	521	[0x80 >> 1] = "msp34xx",
	522	[0x88 >> 1] = "msp34xx",
	523	[0xa0 >> 1] = "eeprom",
	524	[0xb8 >> 1] = "tvp5150a",
	525	[0xba >> 1] = "tvp5150a",
	526	[0xc0 >> 1] = "tuner (analog)",
	527	[0xc2 >> 1] = "tuner (analog)",
	528	[0xc4 >> 1] = "tuner (analog)",
	529	[0xc6 >> 1] = "tuner (analog)",
	530	};
	531
	532	/*
	533	* do_i2c_scan()
	534	* check i2c address range for devices
	535	*/
fad7b958	536	void em28xx_do_i2c_scan(struct em28xx *dev)
a6c2ba28	537	{
fad7b958	538	u8 i2c_devicelist[128];
a6c2ba28	539	unsigned char buf;
	540	int i, rc;
	541
fad7b958 SS	542	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
fad7b958 SS	543
53c4e955	544	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
fad7b958 SS	545	dev->i2c_client.addr = i;
fad7b958 SS	546	rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
a6c2ba28	547	if (rc < 0)
a6c2ba28	548	continue;
fad7b958 SS	549	i2c_devicelist[i] = i;
	550	printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
	551	dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
a6c2ba28	552	}
fad7b958 SS	553
	554	dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
	555	ARRAY_SIZE(i2c_devicelist), 32);
a6c2ba28	556	}
	557
	558	/*
3acf2809	559	* em28xx_i2c_call_clients()
a6c2ba28	560	* send commands to all attached i2c devices
a6c2ba28	561	*/
3acf2809	562	void em28xx_i2c_call_clients(struct em28xx dev, unsigned int cmd, void arg)
a6c2ba28	563	{
	564	BUG_ON(NULL == dev->i2c_adap.algo_data);
	565	i2c_clients_command(&dev->i2c_adap, cmd, arg);
	566	}
	567
	568	/*
3acf2809	569	* em28xx_i2c_register()
a6c2ba28	570	* register i2c bus
a6c2ba28	571	*/
3acf2809	572	int em28xx_i2c_register(struct em28xx *dev)
a6c2ba28	573	{
3acf2809 MCC	574	BUG_ON(!dev->em28xx_write_regs \|\| !dev->em28xx_read_reg);
	575	BUG_ON(!dev->em28xx_write_regs_req \|\| !dev->em28xx_read_reg_req);
	576	dev->i2c_adap = em28xx_adap_template;
a6c2ba28	577	dev->i2c_adap.dev.parent = &dev->udev->dev;
	578	strcpy(dev->i2c_adap.name, dev->name);
	579	dev->i2c_adap.algo_data = dev;
	580	i2c_add_adapter(&dev->i2c_adap);
	581
3acf2809	582	dev->i2c_client = em28xx_client_template;
a6c2ba28	583	dev->i2c_client.adapter = &dev->i2c_adap;
a6c2ba28	584
3acf2809	585	em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
a6c2ba28	586
a6c2ba28	587	if (i2c_scan)
fad7b958	588	em28xx_do_i2c_scan(dev);
a6c2ba28	589	return 0;
	590	}
	591
	592	/*
3acf2809	593	* em28xx_i2c_unregister()
a6c2ba28	594	* unregister i2c_bus
a6c2ba28	595	*/
3acf2809	596	int em28xx_i2c_unregister(struct em28xx *dev)
a6c2ba28	597	{
	598	i2c_del_adapter(&dev->i2c_adap);
	599	return 0;
	600	}