[GitHub/mt8127/android_kernel_alcatel_ttab.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...) 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, __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 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 AM	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 AM	33
	34	/* ----------------------------------------------------------- */
	35
ff699e6b	36	static unsigned int i2c_scan;
a6c2ba28 AM	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 AM	41	module_param(i2c_debug, int, 0644);
	42	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
	43
d5e52653	44	#define dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\
674434c6	45	printk(fmt, ##args); } while (0)
d5e52653 MCC	46	#define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \
d5e52653 MCC	47	printk(KERN_DEBUG "%s at %s: " fmt, \
d80e134d	48	dev->name, __func__ , ##args); } while (0)
a6c2ba28 AM	49
a6c2ba28 AM	50	/*
596d92d5 MCC	51	* em2800_i2c_send_max4()
	52	* send up to 4 bytes to the i2c device
	53	*/
3acf2809	54	static int em2800_i2c_send_max4(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	55	char *buf, int len)
	56	{
	57	int ret;
	58	int write_timeout;
	59	unsigned char b2[6];
	60	BUG_ON(len < 1 \|\| len > 4);
	61	b2[5] = 0x80 + len - 1;
	62	b2[4] = addr;
	63	b2[3] = buf[0];
	64	if (len > 1)
	65	b2[2] = buf[1];
	66	if (len > 2)
	67	b2[1] = buf[2];
	68	if (len > 3)
	69	b2[0] = buf[3];
	70
3acf2809	71	ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
596d92d5	72	if (ret != 2 + len) {
beb7dd86	73	em28xx_warn("writing to i2c device failed (error=%i)\n", ret);
596d92d5 MCC	74	return -EIO;
	75	}
	76	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	77	write_timeout -= 5) {
3acf2809	78	ret = dev->em28xx_read_reg(dev, 0x05);
596d92d5 MCC	79	if (ret == 0x80 + len - 1)
596d92d5 MCC	80	return len;
e8e41da4	81	msleep(5);
596d92d5	82	}
3acf2809	83	em28xx_warn("i2c write timed out\n");
596d92d5 MCC	84	return -EIO;
	85	}
	86
	87	/*
	88	* em2800_i2c_send_bytes()
	89	*/
	90	static int em2800_i2c_send_bytes(void data, unsigned char addr, char buf,
	91	short len)
	92	{
	93	char *bufPtr = buf;
	94	int ret;
	95	int wrcount = 0;
	96	int count;
	97	int maxLen = 4;
3acf2809	98	struct em28xx dev = (struct em28xx )data;
596d92d5 MCC	99	while (len > 0) {
	100	count = (len > maxLen) ? maxLen : len;
	101	ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
	102	if (ret > 0) {
	103	len -= count;
	104	bufPtr += count;
	105	wrcount += count;
	106	} else
	107	return (ret < 0) ? ret : -EFAULT;
	108	}
	109	return wrcount;
	110	}
	111
	112	/*
	113	* em2800_i2c_check_for_device()
	114	* check if there is a i2c_device at the supplied address
	115	*/
3acf2809	116	static int em2800_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
596d92d5 MCC	117	{
	118	char msg;
	119	int ret;
	120	int write_timeout;
	121	msg = addr;
3acf2809	122	ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1);
596d92d5	123	if (ret < 0) {
3acf2809	124	em28xx_warn("setting i2c device address failed (error=%i)\n",
596d92d5 MCC	125	ret);
	126	return ret;
	127	}
	128	msg = 0x84;
3acf2809	129	ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1);
596d92d5	130	if (ret < 0) {
3acf2809	131	em28xx_warn("preparing i2c read failed (error=%i)\n", ret);
596d92d5 MCC	132	return ret;
	133	}
	134	for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
	135	write_timeout -= 5) {
3acf2809	136	unsigned msg = dev->em28xx_read_reg(dev, 0x5);
596d92d5 MCC	137	if (msg == 0x94)
	138	return -ENODEV;
	139	else if (msg == 0x84)
	140	return 0;
e8e41da4	141	msleep(5);
596d92d5 MCC	142	}
	143	return -ENODEV;
	144	}
	145
	146	/*
	147	* em2800_i2c_recv_bytes()
	148	* read from the i2c device
	149	*/
3acf2809	150	static int em2800_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5 MCC	151	char *buf, int len)
	152	{
	153	int ret;
	154	/* check for the device and set i2c read address */
	155	ret = em2800_i2c_check_for_device(dev, addr);
	156	if (ret) {
3acf2809	157	em28xx_warn
596d92d5 MCC	158	("preparing read at i2c address 0x%x failed (error=%i)\n",
	159	addr, ret);
	160	return ret;
	161	}
3acf2809	162	ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len);
596d92d5	163	if (ret < 0) {
3acf2809	164	em28xx_warn("reading from i2c device at 0x%x failed (error=%i)",
596d92d5 MCC	165	addr, ret);
	166	return ret;
	167	}
	168	return ret;
	169	}
	170
	171	/*
3acf2809	172	* em28xx_i2c_send_bytes()
a6c2ba28 AM	173	* untested for more than 4 bytes
a6c2ba28 AM	174	*/
3acf2809	175	static int em28xx_i2c_send_bytes(void data, unsigned char addr, char buf,
596d92d5	176	short len, int stop)
a6c2ba28 AM	177	{
a6c2ba28 AM	178	int wrcount = 0;
3acf2809	179	struct em28xx dev = (struct em28xx )data;
a6c2ba28	180
3acf2809	181	wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
a6c2ba28 AM	182
	183	return wrcount;
	184	}
	185
	186	/*
3acf2809	187	* em28xx_i2c_recv_bytes()
a6c2ba28 AM	188	* read a byte from the i2c device
a6c2ba28 AM	189	*/
3acf2809	190	static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr,
596d92d5	191	char *buf, int len)
a6c2ba28 AM	192	{
a6c2ba28 AM	193	int ret;
3acf2809	194	ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
a6c2ba28	195	if (ret < 0) {
3acf2809	196	em28xx_warn("reading i2c device failed (error=%i)\n", ret);
a6c2ba28 AM	197	return ret;
a6c2ba28 AM	198	}
3acf2809	199	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28 AM	200	return -ENODEV;
	201	return ret;
	202	}
	203
	204	/*
3acf2809	205	* em28xx_i2c_check_for_device()
a6c2ba28 AM	206	* check if there is a i2c_device at the supplied address
a6c2ba28 AM	207	*/
3acf2809	208	static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr)
a6c2ba28 AM	209	{
	210	char msg;
	211	int ret;
	212	msg = addr;
	213
3acf2809	214	ret = dev->em28xx_read_reg_req(dev, 2, addr);
a6c2ba28	215	if (ret < 0) {
3acf2809	216	em28xx_warn("reading from i2c device failed (error=%i)\n", ret);
a6c2ba28 AM	217	return ret;
a6c2ba28 AM	218	}
3acf2809	219	if (dev->em28xx_read_reg(dev, 0x5) != 0)
a6c2ba28 AM	220	return -ENODEV;
	221	return 0;
	222	}
	223
	224	/*
3acf2809	225	* em28xx_i2c_xfer()
a6c2ba28 AM	226	* the main i2c transfer function
a6c2ba28 AM	227	*/
3acf2809	228	static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
a6c2ba28 AM	229	struct i2c_msg msgs[], int num)
a6c2ba28 AM	230	{
3acf2809	231	struct em28xx *dev = i2c_adap->algo_data;
a6c2ba28 AM	232	int addr, rc, i, byte;
	233
	234	if (num <= 0)
	235	return 0;
	236	for (i = 0; i < num; i++) {
	237	addr = msgs[i].addr << 1;
d5e52653	238	dprintk2(2,"%s %s addr=%x len=%d:",
a6c2ba28 AM	239	(msgs[i].flags & I2C_M_RD) ? "read" : "write",
	240	i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
	241	if (!msgs[i].len) { /* no len: check only for device presence */
596d92d5 MCC	242	if (dev->is_em2800)
	243	rc = em2800_i2c_check_for_device(dev, addr);
	244	else
3acf2809	245	rc = em28xx_i2c_check_for_device(dev, addr);
a6c2ba28	246	if (rc < 0) {
d5e52653	247	dprintk2(2," no device\n");
a6c2ba28 AM	248	return rc;
	249	}
	250
596d92d5	251	} else if (msgs[i].flags & I2C_M_RD) {
a6c2ba28	252	/* read bytes */
596d92d5 MCC	253	if (dev->is_em2800)
	254	rc = em2800_i2c_recv_bytes(dev, addr,
	255	msgs[i].buf,
	256	msgs[i].len);
	257	else
3acf2809	258	rc = em28xx_i2c_recv_bytes(dev, addr,
596d92d5 MCC	259	msgs[i].buf,
596d92d5 MCC	260	msgs[i].len);
d5e52653	261	if (i2c_debug>=2) {
a6c2ba28 AM	262	for (byte = 0; byte < msgs[i].len; byte++) {
	263	printk(" %02x", msgs[i].buf[byte]);
	264	}
	265	}
	266	} else {
	267	/* write bytes */
d5e52653	268	if (i2c_debug>=2) {
a6c2ba28 AM	269	for (byte = 0; byte < msgs[i].len; byte++)
	270	printk(" %02x", msgs[i].buf[byte]);
	271	}
596d92d5 MCC	272	if (dev->is_em2800)
	273	rc = em2800_i2c_send_bytes(dev, addr,
	274	msgs[i].buf,
	275	msgs[i].len);
	276	else
3acf2809	277	rc = em28xx_i2c_send_bytes(dev, addr,
596d92d5 MCC	278	msgs[i].buf,
	279	msgs[i].len,
	280	i == num - 1);
a6c2ba28	281	}
e8e41da4 MR	282	if (rc < 0)
e8e41da4 MR	283	goto err;
d5e52653	284	if (i2c_debug>=2)
a6c2ba28 AM	285	printk("\n");
	286	}
	287
	288	return num;
	289	err:
d5e52653	290	dprintk2(2," ERROR: %i\n", rc);
a6c2ba28 AM	291	return rc;
	292	}
	293
03910cc3 MCC	294	/* based on linux/sunrpc/svcauth.h and linux/hash.h
	295	* The original hash function returns a different value, if arch is x86_64
	296	* or i386.
	297	*/
	298	static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
	299	{
	300	unsigned long hash = 0;
	301	unsigned long l = 0;
	302	int len = 0;
	303	unsigned char c;
	304	do {
	305	if (len == length) {
	306	c = (char)len;
	307	len = -1;
	308	} else
	309	c = *buf++;
	310	l = (l << 8) \| c;
	311	len++;
	312	if ((len & (32 / 8 - 1)) == 0)
	313	hash = ((hash^l) * 0x9e370001UL);
	314	} while (len);
	315
	316	return (hash >> (32 - bits)) & 0xffffffffUL;
	317	}
	318
3acf2809	319	static int em28xx_i2c_eeprom(struct em28xx dev, unsigned char eedata, int len)
a6c2ba28 AM	320	{
a6c2ba28 AM	321	unsigned char buf, *p = eedata;
3acf2809	322	struct em28xx_eeprom em_eeprom = (void )eedata;
a6c2ba28 AM	323	int i, err, size = len, block;
	324
	325	dev->i2c_client.addr = 0xa0 >> 1;
596d92d5 MCC	326
	327	/* Check if board has eeprom */
	328	err = i2c_master_recv(&dev->i2c_client, &buf, 0);
	329	if (err < 0)
	330	return -1;
	331
a6c2ba28 AM	332	buf = 0;
	333	if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
	334	printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
	335	dev->name, err);
	336	return -1;
	337	}
	338	while (size > 0) {
	339	if (size > 16)
	340	block = 16;
	341	else
	342	block = size;
	343
	344	if (block !=
	345	(err = i2c_master_recv(&dev->i2c_client, p, block))) {
	346	printk(KERN_WARNING
	347	"%s: i2c eeprom read error (err=%d)\n",
	348	dev->name, err);
	349	return -1;
	350	}
	351	size -= block;
	352	p += block;
	353	}
	354	for (i = 0; i < len; i++) {
	355	if (0 == (i % 16))
	356	printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
	357	printk(" %02x", eedata[i]);
	358	if (15 == (i % 16))
	359	printk("\n");
	360	}
	361
03910cc3 MCC	362	if (em_eeprom->id == 0x9567eb1a)
	363	dev->hash = em28xx_hash_mem(eedata, len, 32);
	364
	365	printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n",
	366	em_eeprom->id, dev->hash);
a6c2ba28 AM	367	printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
	368	em_eeprom->product_ID);
	369
	370	switch (em_eeprom->chip_conf >> 4 & 0x3) {
	371	case 0:
	372	printk(KERN_INFO "No audio on board.\n");
	373	break;
	374	case 1:
	375	printk(KERN_INFO "AC97 audio (5 sample rates)\n");
	376	break;
	377	case 2:
	378	printk(KERN_INFO "I2S audio, sample rate=32k\n");
	379	break;
	380	case 3:
	381	printk(KERN_INFO "I2S audio, 3 sample rates\n");
	382	break;
	383	}
	384
	385	if (em_eeprom->chip_conf & 1 << 3)
	386	printk(KERN_INFO "USB Remote wakeup capable\n");
	387
	388	if (em_eeprom->chip_conf & 1 << 2)
	389	printk(KERN_INFO "USB Self power capable\n");
	390
	391	switch (em_eeprom->chip_conf & 0x3) {
	392	case 0:
	393	printk(KERN_INFO "500mA max power\n");
	394	break;
	395	case 1:
	396	printk(KERN_INFO "400mA max power\n");
	397	break;
	398	case 2:
	399	printk(KERN_INFO "300mA max power\n");
	400	break;
	401	case 3:
	402	printk(KERN_INFO "200mA max power\n");
	403	break;
	404	}
91cad0f2 MCC	405	printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
	406	em_eeprom->string_idx_table,em_eeprom->string1,
	407	em_eeprom->string2,em_eeprom->string3);
a6c2ba28 AM	408
	409	return 0;
	410	}
	411
	412	/* ----------------------------------------------------------- */
	413
a6c2ba28 AM	414	/*
	415	* functionality()
	416	*/
	417	static u32 functionality(struct i2c_adapter *adap)
	418	{
	419	return I2C_FUNC_SMBUS_EMUL;
	420	}
	421
a6c2ba28	422
a6c2ba28 AM	423	/*
	424	* attach_inform()
	425	* gets called when a device attaches to the i2c bus
	426	* does some basic configuration
	427	*/
	428	static int attach_inform(struct i2c_client *client)
	429	{
3acf2809	430	struct em28xx *dev = client->adapter->algo_data;
a6c2ba28	431
a6c2ba28	432	switch (client->addr << 1) {
8c6da5c4	433	case 0x86:
fe51f819 MCC	434	case 0x84:
	435	case 0x96:
	436	case 0x94:
15396236	437	{
7f171123 MCC	438	struct v4l2_priv_tun_config tda9887_cfg;
7f171123 MCC	439
15396236 MCC	440	struct tuner_setup tun_setup;
	441
	442	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	443	tun_setup.type = TUNER_TDA9887;
	444	tun_setup.addr = client->addr;
	445
	446	em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
7f171123 MCC	447
	448	tda9887_cfg.tuner = TUNER_TDA9887;
	449	tda9887_cfg.priv = &dev->tda9887_conf;
	450	em28xx_i2c_call_clients(dev, TUNER_SET_CONFIG,
	451	&tda9887_cfg);
a9ae9fb1	452	break;
15396236	453	}
30556b23 MR	454	case 0x42:
	455	dprintk1(1,"attach_inform: saa7114 detected.\n");
	456	break;
a9ae9fb1	457	case 0x4a:
d5e52653	458	dprintk1(1,"attach_inform: saa7113 detected.\n");
a9ae9fb1 MR	459	break;
a9ae9fb1 MR	460	case 0xa0:
d5e52653 MCC	461	dprintk1(1,"attach_inform: eeprom detected.\n");
	462	break;
	463	case 0x60:
	464	case 0x8e:
	465	{
	466	struct IR_i2c *ir = i2c_get_clientdata(client);
	467	dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys);
3acf2809	468	em28xx_set_ir(dev,ir);
a9ae9fb1	469	break;
d5e52653	470	}
a9ae9fb1 MR	471	case 0x80:
a9ae9fb1 MR	472	case 0x88:
d5e52653	473	dprintk1(1,"attach_inform: msp34xx detected.\n");
a9ae9fb1 MR	474	break;
	475	case 0xb8:
	476	case 0xba:
d5e52653	477	dprintk1(1,"attach_inform: tvp5150 detected.\n");
a9ae9fb1	478	break;
15396236	479
a9ae9fb1	480	default:
03910cc3 MCC	481	if (!dev->tuner_addr)
	482	dev->tuner_addr = client->addr;
	483
d5e52653	484	dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1);
03910cc3	485
a6c2ba28 AM	486	}
	487
	488	return 0;
	489	}
	490
3acf2809 MCC	491	static struct i2c_algorithm em28xx_algo = {
3acf2809 MCC	492	.master_xfer = em28xx_i2c_xfer,
a6c2ba28 AM	493	.functionality = functionality,
	494	};
	495
3acf2809	496	static struct i2c_adapter em28xx_adap_template = {
a6c2ba28	497	.owner = THIS_MODULE,
a6c2ba28	498	.class = I2C_CLASS_TV_ANALOG,
3acf2809 MCC	499	.name = "em28xx",
	500	.id = I2C_HW_B_EM28XX,
	501	.algo = &em28xx_algo,
a6c2ba28 AM	502	.client_register = attach_inform,
	503	};
	504
3acf2809 MCC	505	static struct i2c_client em28xx_client_template = {
3acf2809 MCC	506	.name = "em28xx internal",
a6c2ba28 AM	507	};
	508
	509	/* ----------------------------------------------------------- */
	510
	511	/*
	512	* i2c_devs
	513	* incomplete list of known devices
	514	*/
	515	static char *i2c_devs[128] = {
	516	[0x4a >> 1] = "saa7113h",
	517	[0x60 >> 1] = "remote IR sensor",
da45a2a5	518	[0x8e >> 1] = "remote IR sensor",
a6c2ba28 AM	519	[0x86 >> 1] = "tda9887",
	520	[0x80 >> 1] = "msp34xx",
	521	[0x88 >> 1] = "msp34xx",
	522	[0xa0 >> 1] = "eeprom",
	523	[0xb8 >> 1] = "tvp5150a",
	524	[0xba >> 1] = "tvp5150a",
	525	[0xc0 >> 1] = "tuner (analog)",
	526	[0xc2 >> 1] = "tuner (analog)",
	527	[0xc4 >> 1] = "tuner (analog)",
	528	[0xc6 >> 1] = "tuner (analog)",
	529	};
	530
	531	/*
	532	* do_i2c_scan()
	533	* check i2c address range for devices
	534	*/
fad7b958	535	void em28xx_do_i2c_scan(struct em28xx *dev)
a6c2ba28	536	{
fad7b958	537	u8 i2c_devicelist[128];
a6c2ba28 AM	538	unsigned char buf;
	539	int i, rc;
	540
fad7b958 SS	541	memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist));
fad7b958 SS	542
53c4e955	543	for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
fad7b958 SS	544	dev->i2c_client.addr = i;
fad7b958 SS	545	rc = i2c_master_recv(&dev->i2c_client, &buf, 0);
a6c2ba28 AM	546	if (rc < 0)
a6c2ba28 AM	547	continue;
fad7b958 SS	548	i2c_devicelist[i] = i;
	549	printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n",
	550	dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
a6c2ba28	551	}
fad7b958 SS	552
	553	dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
	554	ARRAY_SIZE(i2c_devicelist), 32);
a6c2ba28 AM	555	}
	556
	557	/*
3acf2809	558	* em28xx_i2c_call_clients()
a6c2ba28 AM	559	* send commands to all attached i2c devices
a6c2ba28 AM	560	*/
3acf2809	561	void em28xx_i2c_call_clients(struct em28xx dev, unsigned int cmd, void arg)
a6c2ba28 AM	562	{
	563	BUG_ON(NULL == dev->i2c_adap.algo_data);
	564	i2c_clients_command(&dev->i2c_adap, cmd, arg);
	565	}
	566
	567	/*
3acf2809	568	* em28xx_i2c_register()
a6c2ba28 AM	569	* register i2c bus
a6c2ba28 AM	570	*/
3acf2809	571	int em28xx_i2c_register(struct em28xx *dev)
a6c2ba28	572	{
3acf2809 MCC	573	BUG_ON(!dev->em28xx_write_regs \|\| !dev->em28xx_read_reg);
	574	BUG_ON(!dev->em28xx_write_regs_req \|\| !dev->em28xx_read_reg_req);
	575	dev->i2c_adap = em28xx_adap_template;
a6c2ba28 AM	576	dev->i2c_adap.dev.parent = &dev->udev->dev;
	577	strcpy(dev->i2c_adap.name, dev->name);
	578	dev->i2c_adap.algo_data = dev;
	579	i2c_add_adapter(&dev->i2c_adap);
	580
3acf2809	581	dev->i2c_client = em28xx_client_template;
a6c2ba28 AM	582	dev->i2c_client.adapter = &dev->i2c_adap;
a6c2ba28 AM	583
3acf2809	584	em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
a6c2ba28 AM	585
a6c2ba28 AM	586	if (i2c_scan)
fad7b958	587	em28xx_do_i2c_scan(dev);
a6c2ba28 AM	588	return 0;
	589	}
	590
	591	/*
3acf2809	592	* em28xx_i2c_unregister()
a6c2ba28 AM	593	* unregister i2c_bus
a6c2ba28 AM	594	*/
3acf2809	595	int em28xx_i2c_unregister(struct em28xx *dev)
a6c2ba28 AM	596	{
	597	i2c_del_adapter(&dev->i2c_adap);
	598	return 0;
	599	}