[mirror_ubuntu-zesty-kernel.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 "em28xx.h"
#include "tuner-xc2028.h"
#include <media/v4l2-common.h>
#include <media/tuner.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)

/*
 * 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 reg = dev->em28xx_read_reg(dev, 0x5);

		if (reg == 0x94)
			return -ENODEV;
		else if (reg == 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) {
		em28xx_errdev("board has no eeprom\n");
		memset(eedata, 0, len);
		return -ENODEV;
	}

	buf = 0;

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

	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;

	retval = i2c_add_adapter(&dev->i2c_adap);
	if (retval < 0) {
		em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
			__func__, retval);
		return retval;
	}

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

	retval = em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
	if ((retval < 0) && (retval != -ENODEV)) {
		em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
			__func__, retval);

		return retval;
	}

	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
f7abcd38	29	#include "em28xx.h"
6c362c8e	30	#include "tuner-xc2028.h"
5e453dc7	31	#include <media/v4l2-common.h>
d5e52653	32	#include <media/tuner.h>
a6c2ba28	33
	34	/* ----------------------------------------------------------- */
	35
ff699e6b	36	static unsigned int i2c_scan;
a6c2ba28	37	module_param(i2c_scan, int, 0444);
	38	MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
	39
ff699e6b	40	static unsigned int i2c_debug;
a6c2ba28	41	module_param(i2c_debug, int, 0644);
	42	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	43
6ea54d93 DSL	44
	45	#define dprintk1(lvl, fmt, args...) \
	46	do { \
	47	if (i2c_debug >= lvl) { \
	48	printk(fmt, ##args); \
	49	} \
	50	} while (0)
	51
	52	#define dprintk2(lvl, fmt, args...) \
	53	do { \
	54	if (i2c_debug >= lvl) { \
	55	printk(KERN_DEBUG "%s at %s: " fmt, \
	56	dev->name, __func__ , ##args); \
	57	} \
	58	} while (0)
a6c2ba28	59
a6c2ba28	60	/*
596d92d5 MCC	61	* em2800_i2c_send_max4()
	62	* send up to 4 bytes to the i2c device
	63	*/
3acf2809	64	static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	65	char *buf, int len)
	66	{
	67	int ret;
	68	int write_timeout;
	69	unsigned char b2[6];
	70	BUG_ON(len < 1 \|\| len > 4);
	71	b2[5] = 0x80 + len - 1;
	72	b2[4] = addr;
	73	b2[3] = buf[0];
	74	if (len > 1)
	75	b2[2] = buf[1];
	76	if (len > 2)
	77	b2[1] = buf[2];
	78	if (len > 3)
	79	b2[0] = buf[3];
	80
3acf2809	81	ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
596d92d5	82	if (ret != 2 + len) {
beb7dd86	83	em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
596d92d5 MCC	84	return -EIO;
	85	}
	86	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	87	write_timeout -= 5) {
3acf2809	88	ret = dev->em28xx_read_reg(dev, 0x05);
596d92d5 MCC	89	if (ret == 0x80 + len - 1)
596d92d5 MCC	90	return len;
e8e41da4	91	msleep(5);
596d92d5	92	}
3acf2809	93	em28xx_warn("i2c write timed out\n");
596d92d5 MCC	94	return -EIO;
	95	}
	96
	97	/*
	98	* em2800_i2c_send_bytes()
	99	*/
	100	static int em2800_i2c_send_bytes(void data, unsigned char addr, char buf,
	101	short len)
	102	{
	103	char *bufPtr = buf;
	104	int ret;
	105	int wrcount = 0;
	106	int count;
	107	int maxLen = 4;
3acf2809	108	struct em28xx dev = (struct em28xx )data;
596d92d5 MCC	109	while (len > 0) {
	110	count = (len > maxLen) ? maxLen : len;
	111	ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
	112	if (ret > 0) {
	113	len -= count;
	114	bufPtr += count;
	115	wrcount += count;
	116	} else
	117	return (ret < 0) ? ret : -EFAULT;
	118	}
	119	return wrcount;
	120	}
	121
	122	/*
	123	* em2800_i2c_check_for_device()
	124	* check if there is a i2c_device at the supplied address
	125	*/
3acf2809	126	static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
596d92d5 MCC	127	{
	128	char msg;
	129	int ret;
	130	int write_timeout;
	131	msg = addr;
3acf2809	132	ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
596d92d5	133	if (ret < 0) {
3acf2809	134	em28xx_warn("setting i2c device address failed (error=%i)\n",
596d92d5 MCC	135	ret);
	136	return ret;
	137	}
	138	msg = 0x84;
3acf2809	139	ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
596d92d5	140	if (ret < 0) {
3acf2809	141	em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
596d92d5 MCC	142	return ret;
	143	}
	144	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	145	write_timeout -= 5) {
d45b9b8a HV	146	unsigned reg = dev->em28xx_read_reg(dev, 0x5);
	147
	148	if (reg == 0x94)
596d92d5	149	return -ENODEV;
d45b9b8a	150	else if (reg == 0x84)
596d92d5	151	return 0;
e8e41da4	152	msleep(5);
596d92d5 MCC	153	}
	154	return -ENODEV;
	155	}
	156
	157	/*
	158	* em2800_i2c_recv_bytes()
	159	* read from the i2c device
	160	*/
3acf2809	161	static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	162	char *buf, int len)
	163	{
	164	int ret;
	165	/* check for the device and set i2c read address */
	166	ret = em2800_i2c_check_for_device(dev, addr);
	167	if (ret) {
3acf2809	168	em28xx_warn
596d92d5 MCC	169	("preparing read at i2c address 0x%x failed (error=%i)\n",
	170	addr, ret);
	171	return ret;
	172	}
3acf2809	173	ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
596d92d5	174	if (ret < 0) {
3acf2809	175	em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
596d92d5 MCC	176	addr, ret);
	177	return ret;
	178	}
	179	return ret;
	180	}
	181
	182	/*
3acf2809	183	* em28xx_i2c_send_bytes()
a6c2ba28	184	* untested for more than 4 bytes
a6c2ba28	185	*/
3acf2809	186	static int em28xx_i2c_send_bytes(void data, unsigned char addr, char buf,
596d92d5	187	short len, int stop)
a6c2ba28	188	{
a6c2ba28	189	int wrcount = 0;
3acf2809	190	struct em28xx dev = (struct em28xx )data;
a6c2ba28	191
3acf2809	192	wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
a6c2ba28	193
	194	return wrcount;
	195	}
	196
	197	/*
3acf2809	198	* em28xx_i2c_recv_bytes()
a6c2ba28	199	* read a byte from the i2c device
a6c2ba28	200	*/
3acf2809	201	static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5	202	char *buf, int len)
a6c2ba28	203	{
a6c2ba28	204	int ret;
3acf2809	205	ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
a6c2ba28	206	if (ret < 0) {
3acf2809	207	em28xx_warn("reading i2c device failed (error=%i)\n", ret);
a6c2ba28	208	return ret;
a6c2ba28	209	}
3acf2809	210	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28	211	return -ENODEV;
	212	return ret;
	213	}
	214
	215	/*
3acf2809	216	* em28xx_i2c_check_for_device()
a6c2ba28	217	* check if there is a i2c_device at the supplied address
a6c2ba28	218	*/
3acf2809	219	static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
a6c2ba28	220	{
	221	char msg;
	222	int ret;
	223	msg = addr;
	224
3acf2809	225	ret = dev->em28xx_read_reg_req(dev, 2, addr);
a6c2ba28	226	if (ret < 0) {
3acf2809	227	em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
a6c2ba28	228	return ret;
a6c2ba28	229	}
3acf2809	230	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28	231	return -ENODEV;
	232	return 0;
	233	}
	234
	235	/*
3acf2809	236	* em28xx_i2c_xfer()
a6c2ba28	237	* the main i2c transfer function
a6c2ba28	238	*/
3acf2809	239	static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
a6c2ba28	240	struct i2c_msg msgs[], int num)
a6c2ba28	241	{
3acf2809	242	struct em28xx *dev = i2c_adap->algo_data;
a6c2ba28	243	int addr, rc, i, byte;
	244
	245	if (num <= 0)
	246	return 0;
	247	for (i = 0; i < num; i++) {
	248	addr = msgs[i].addr << 1;
6ea54d93	249	dprintk2(2, "%s %s addr=%x len=%d:",
a6c2ba28	250	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
a6c2ba28	251	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
6ea54d93	252	if (!msgs[i].len) { /* no len: check only for device presence */
596d92d5 MCC	253	if (dev->is_em2800)
	254	rc = em2800_i2c_check_for_device(dev, addr);
	255	else
3acf2809	256	rc = em28xx_i2c_check_for_device(dev, addr);
a6c2ba28	257	if (rc < 0) {
6ea54d93	258	dprintk2(2, " no device\n");
a6c2ba28	259	return rc;
	260	}
	261
596d92d5	262	} else if (msgs[i].flags & I2C_M_RD) {
a6c2ba28	263	/* read bytes */
596d92d5 MCC	264	if (dev->is_em2800)
	265	rc = em2800_i2c_recv_bytes(dev, addr,
	266	msgs[i].buf,
	267	msgs[i].len);
	268	else
3acf2809	269	rc = em28xx_i2c_recv_bytes(dev, addr,
596d92d5 MCC	270	msgs[i].buf,
596d92d5 MCC	271	msgs[i].len);
6ea54d93 DSL	272	if (i2c_debug >= 2) {
6ea54d93 DSL	273	for (byte = 0; byte < msgs[i].len; byte++)
a6c2ba28	274	printk(" %02x", msgs[i].buf[byte]);
a6c2ba28	275	}
	276	} else {
	277	/* write bytes */
6ea54d93	278	if (i2c_debug >= 2) {
a6c2ba28	279	for (byte = 0; byte < msgs[i].len; byte++)
	280	printk(" %02x", msgs[i].buf[byte]);
	281	}
596d92d5 MCC	282	if (dev->is_em2800)
	283	rc = em2800_i2c_send_bytes(dev, addr,
	284	msgs[i].buf,
	285	msgs[i].len);
	286	else
3acf2809	287	rc = em28xx_i2c_send_bytes(dev, addr,
596d92d5 MCC	288	msgs[i].buf,
	289	msgs[i].len,
	290	i == num - 1);
a6c2ba28	291	}
e8e41da4 MR	292	if (rc < 0)
e8e41da4 MR	293	goto err;
6ea54d93	294	if (i2c_debug >= 2)
a6c2ba28	295	printk("\n");
	296	}
	297
	298	return num;
6ea54d93 DSL	299	err:
6ea54d93 DSL	300	dprintk2(2, " ERROR: %i\n", rc);
a6c2ba28	301	return rc;
	302	}
	303
03910cc3 MCC	304	/* based on linux/sunrpc/svcauth.h and linux/hash.h
	305	* The original hash function returns a different value, if arch is x86_64
	306	* or i386.
	307	*/
	308	static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
	309	{
	310	unsigned long hash = 0;
	311	unsigned long l = 0;
	312	int len = 0;
	313	unsigned char c;
	314	do {
	315	if (len == length) {
	316	c = (char)len;
	317	len = -1;
	318	} else
	319	c = *buf++;
	320	l = (l << 8) \| c;
	321	len++;
	322	if ((len & (32 / 8 - 1)) == 0)
	323	hash = ((hash^l) * 0x9e370001UL);
	324	} while (len);
	325
	326	return (hash >> (32 - bits)) & 0xffffffffUL;
	327	}
	328
3acf2809	329	static int em28xx_i2c_eeprom(struct em28xx dev, unsigned char eedata, int len)
a6c2ba28	330	{
a6c2ba28	331	unsigned char buf, *p = eedata;
3acf2809	332	struct em28xx_eeprom em_eeprom = (void )eedata;
a6c2ba28	333	int i, err, size = len, block;
	334
	335	dev->i2c_client.addr = 0xa0 >> 1;
596d92d5 MCC	336
	337	/* Check if board has eeprom */
	338	err = i2c_master_recv(&dev->i2c_client, &buf, 0);
f2a01a00	339	if (err < 0) {
c41109fc MCC	340	em28xx_errdev("board has no eeprom\n");
	341	memset(eedata, 0, len);
	342	return -ENODEV;
f2a01a00	343	}
596d92d5	344
a6c2ba28	345	buf = 0;
6ea54d93 DSL	346
	347	err = i2c_master_send(&dev->i2c_client, &buf, 1);
	348	if (err != 1) {
a6c2ba28	349	printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
a6c2ba28	350	dev->name, err);
f2a01a00	351	return err;
a6c2ba28	352	}
	353	while (size > 0) {
	354	if (size > 16)
	355	block = 16;
	356	else
	357	block = size;
	358
	359	if (block !=
	360	(err = i2c_master_recv(&dev->i2c_client, p, block))) {
	361	printk(KERN_WARNING
	362	"%s: i2c eeprom read error (err=%d)\n",
	363	dev->name, err);
f2a01a00	364	return err;
a6c2ba28	365	}
	366	size -= block;
	367	p += block;
	368	}
	369	for (i = 0; i < len; i++) {
	370	if (0 == (i % 16))
	371	printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
	372	printk(" %02x", eedata[i]);
	373	if (15 == (i % 16))
	374	printk("\n");
	375	}
	376
03910cc3 MCC	377	if (em_eeprom->id == 0x9567eb1a)
	378	dev->hash = em28xx_hash_mem(eedata, len, 32);
	379
	380	printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n",
	381	em_eeprom->id, dev->hash);
a6c2ba28	382	printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
	383	em_eeprom->product_ID);
	384
	385	switch (em_eeprom->chip_conf >> 4 & 0x3) {
	386	case 0:
	387	printk(KERN_INFO "No audio on board.\n");
	388	break;
	389	case 1:
	390	printk(KERN_INFO "AC97 audio (5 sample rates)\n");
	391	break;
	392	case 2:
	393	printk(KERN_INFO "I2S audio, sample rate=32k\n");
	394	break;
	395	case 3:
	396	printk(KERN_INFO "I2S audio, 3 sample rates\n");
	397	break;
	398	}
	399
	400	if (em_eeprom->chip_conf & 1 << 3)
	401	printk(KERN_INFO "USB Remote wakeup capable\n");
	402
	403	if (em_eeprom->chip_conf & 1 << 2)
	404	printk(KERN_INFO "USB Self power capable\n");
	405
	406	switch (em_eeprom->chip_conf & 0x3) {
	407	case 0:
	408	printk(KERN_INFO "500mA max power\n");
	409	break;
	410	case 1:
	411	printk(KERN_INFO "400mA max power\n");
	412	break;
	413	case 2:
	414	printk(KERN_INFO "300mA max power\n");
	415	break;
	416	case 3:
	417	printk(KERN_INFO "200mA max power\n");
	418	break;
	419	}
91cad0f2	420	printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
6ea54d93 DSL	421	em_eeprom->string_idx_table,
	422	em_eeprom->string1,
	423	em_eeprom->string2,
	424	em_eeprom->string3);
a6c2ba28	425
	426	return 0;
	427	}
	428
	429	/* ----------------------------------------------------------- */
	430
a6c2ba28	431	/*
	432	* functionality()
	433	*/
	434	static u32 functionality(struct i2c_adapter *adap)
	435	{
	436	return I2C_FUNC_SMBUS_EMUL;
	437	}
	438
a6c2ba28	439	/*
	440	* attach_inform()
	441	* gets called when a device attaches to the i2c bus
	442	* does some basic configuration
	443	*/
	444	static int attach_inform(struct i2c_client *client)
	445	{
3acf2809	446	struct em28xx *dev = client->adapter->algo_data;
a6c2ba28	447
a6c2ba28	448	switch (client->addr << 1) {
6ea54d93 DSL	449	case 0x86:
	450	case 0x84:
	451	case 0x96:
	452	case 0x94:
	453	{
	454	struct v4l2_priv_tun_config tda9887_cfg;
	455
	456	struct tuner_setup tun_setup;
	457
	458	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	459	tun_setup.type = TUNER_TDA9887;
	460	tun_setup.addr = client->addr;
	461
	462	em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR,
	463	&tun_setup);
	464
	465	tda9887_cfg.tuner = TUNER_TDA9887;
	466	tda9887_cfg.priv = &dev->tda9887_conf;
	467	em28xx_i2c_call_clients(dev, TUNER_SET_CONFIG,
	468	&tda9887_cfg);
	469	break;
	470	}
	471	case 0x42:
	472	dprintk1(1, "attach_inform: saa7114 detected.\n");
	473	break;
	474	case 0x4a:
	475	dprintk1(1, "attach_inform: saa7113 detected.\n");
	476	break;
	477	case 0xa0:
	478	dprintk1(1, "attach_inform: eeprom detected.\n");
	479	break;
	480	case 0x60:
	481	case 0x8e:
	482	{
	483	struct IR_i2c *ir = i2c_get_clientdata(client);
	484	dprintk1(1, "attach_inform: IR detected (%s).\n",
	485	ir->phys);
	486	em28xx_set_ir(dev, ir);
	487	break;
	488	}
	489	case 0x80:
	490	case 0x88:
	491	dprintk1(1, "attach_inform: msp34xx detected.\n");
	492	break;
	493	case 0xb8:
	494	case 0xba:
	495	dprintk1(1, "attach_inform: tvp5150 detected.\n");
	496	break;
	497
	498	default:
	499	if (!dev->tuner_addr)
	500	dev->tuner_addr = client->addr;
	501
	502	dprintk1(1, "attach inform: detected I2C address %x\n",
	503	client->addr << 1);
03910cc3	504
a6c2ba28	505	}
	506
	507	return 0;
	508	}
	509
3acf2809 MCC	510	static struct i2c_algorithm em28xx_algo = {
3acf2809 MCC	511	.master_xfer = em28xx_i2c_xfer,
a6c2ba28	512	.functionality = functionality,
	513	};
	514
3acf2809	515	static struct i2c_adapter em28xx_adap_template = {
a6c2ba28	516	.owner = THIS_MODULE,
a6c2ba28	517	.class = I2C_CLASS_TV_ANALOG,
3acf2809 MCC	518	.name = "em28xx",
	519	.id = I2C_HW_B_EM28XX,
	520	.algo = &em28xx_algo,
a6c2ba28	521	.client_register = attach_inform,
	522	};
	523
3acf2809 MCC	524	static struct i2c_client em28xx_client_template = {
3acf2809 MCC	525	.name = "em28xx internal",
a6c2ba28	526	};
	527
	528	/* ----------------------------------------------------------- */
	529
	530	/*
	531	* i2c_devs
	532	* incomplete list of known devices
	533	*/
	534	static char *i2c_devs[128] = {
	535	[0x4a >> 1] = "saa7113h",
	536	[0x60 >> 1] = "remote IR sensor",
da45a2a5	537	[0x8e >> 1] = "remote IR sensor",
a6c2ba28	538	[0x86 >> 1] = "tda9887",
	539	[0x80 >> 1] = "msp34xx",
	540	[0x88 >> 1] = "msp34xx",
	541	[0xa0 >> 1] = "eeprom",
	542	[0xb8 >> 1] = "tvp5150a",
	543	[0xba >> 1] = "tvp5150a",
	544	[0xc0 >> 1] = "tuner (analog)",
	545	[0xc2 >> 1] = "tuner (analog)",
	546	[0xc4 >> 1] = "tuner (analog)",
	547	[0xc6 >> 1] = "tuner (analog)",
	548	};
	549
	550	/*
	551	* do_i2c_scan()
	552	* check i2c address range for devices
	553	*/
fad7b958	554	void em28xx_do_i2c_scan(struct em28xx *dev)
a6c2ba28	555	{
fad7b958	556	u8 i2c_devicelist[128];
a6c2ba28	557	unsigned char buf;
	558	int i, rc;
	559
fad7b958 SS	560	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
fad7b958 SS	561
53c4e955	562	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
fad7b958 SS	563	dev->i2c_client.addr = i;
fad7b958 SS	564	rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
a6c2ba28	565	if (rc < 0)
a6c2ba28	566	continue;
fad7b958 SS	567	i2c_devicelist[i] = i;
	568	printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
	569	dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
a6c2ba28	570	}
fad7b958 SS	571
	572	dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
	573	ARRAY_SIZE(i2c_devicelist), 32);
a6c2ba28	574	}
	575
	576	/*
3acf2809	577	* em28xx_i2c_call_clients()
a6c2ba28	578	* send commands to all attached i2c devices
a6c2ba28	579	*/
3acf2809	580	void em28xx_i2c_call_clients(struct em28xx dev, unsigned int cmd, void arg)
a6c2ba28	581	{
	582	BUG_ON(NULL == dev->i2c_adap.algo_data);
	583	i2c_clients_command(&dev->i2c_adap, cmd, arg);
	584	}
	585
	586	/*
3acf2809	587	* em28xx_i2c_register()
a6c2ba28	588	* register i2c bus
a6c2ba28	589	*/
3acf2809	590	int em28xx_i2c_register(struct em28xx *dev)
a6c2ba28	591	{
f2a01a00 DSL	592	int retval;
f2a01a00 DSL	593
3acf2809 MCC	594	BUG_ON(!dev->em28xx_write_regs \|\| !dev->em28xx_read_reg);
	595	BUG_ON(!dev->em28xx_write_regs_req \|\| !dev->em28xx_read_reg_req);
	596	dev->i2c_adap = em28xx_adap_template;
a6c2ba28	597	dev->i2c_adap.dev.parent = &dev->udev->dev;
	598	strcpy(dev->i2c_adap.name, dev->name);
	599	dev->i2c_adap.algo_data = dev;
f2a01a00 DSL	600
	601	retval = i2c_add_adapter(&dev->i2c_adap);
	602	if (retval < 0) {
	603	em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
	604	__func__, retval);
	605	return retval;
	606	}
a6c2ba28	607
3acf2809	608	dev->i2c_client = em28xx_client_template;
a6c2ba28	609	dev->i2c_client.adapter = &dev->i2c_adap;
a6c2ba28	610
f2a01a00	611	retval = em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
c41109fc	612	if ((retval < 0) && (retval != -ENODEV)) {
f2a01a00 DSL	613	em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
f2a01a00 DSL	614	__func__, retval);
c41109fc	615
f2a01a00 DSL	616	return retval;
f2a01a00 DSL	617	}
a6c2ba28	618
a6c2ba28	619	if (i2c_scan)
fad7b958	620	em28xx_do_i2c_scan(dev);
c41109fc	621
a6c2ba28	622	return 0;
	623	}
	624
	625	/*
3acf2809	626	* em28xx_i2c_unregister()
a6c2ba28	627	* unregister i2c_bus
a6c2ba28	628	*/
3acf2809	629	int em28xx_i2c_unregister(struct em28xx *dev)
a6c2ba28	630	{
	631	i2c_del_adapter(&dev->i2c_adap);
	632	return 0;
	633	}