[PATCH] v4l: 716: support for em28xx board family

- Added support for em28xx board family

Signed-off-by: Ludovico Cavedon <cavedon@sssup.it>
Signed-off-by: Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 443 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-i2c.c b/drivers/media/video/em28xx/em28xx-i2c.c
new file mode 100644
index 00000000000..95f80a7615b
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-i2c.c
@@ -0,0 +1,443 @@
+/*
+   em2820-i2c.c - driver for Empia EM2820/2840 USB video capture devices
+
+   Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
+                      Ludovico Cavedon <cavedon@sssup.it>
+                      Mauro Carvalho Chehab <mchehab@brturbo.com.br>
+
+   Based on the em2800 driver from 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/videodev.h>
+#include <media/tuner.h>
+#include <linux/video_decoder.h>
+
+/* To be moved to compat.h */
+#if !defined(I2C_HW_B_EM2820)
+#define I2C_HW_B_EM2820 I2C_HW_B_BT848
+#endif
+
+#include "em2820.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 dprintk(fmt, args...) if (i2c_debug) do {\
+			printk(KERN_DEBUG "%s: %s: " fmt "\n",\
+			dev->name, __FUNCTION__ , ##args); } while (0)
+#define dprintk1(fmt, args...) if (i2c_debug) do{ \
+			printk(KERN_DEBUG "%s: %s: " fmt, \
+			dev->name, __FUNCTION__ , ##args); } while (0)
+#define dprintk2(fmt, args...) if (i2c_debug) do {\
+			printk(fmt , ##args); } while (0)
+
+/*
+ * i2c_send_bytes()
+ * untested for more than 4 bytes
+ */
+static int i2c_send_bytes(void *data, unsigned char addr, char *buf, short len,
+			  int stop)
+{
+	int wrcount = 0;
+	struct em2820 *dev = (struct em2820 *)data;
+
+	wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
+
+	return wrcount;
+}
+
+/*
+ * i2c_recv_byte()
+ * read a byte from the i2c device
+ */
+static int i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf,
+			  int len)
+{
+	int ret;
+	ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len);
+	if (ret < 0) {
+		em2820_warn("reading i2c device failed (error=%i)\n", ret);
+		return ret;
+	}
+	if (dev->em2820_read_reg(dev, 0x5) != 0)
+		return -ENODEV;
+	return ret;
+}
+
+/*
+ * i2c_check_for_device()
+ * check if there is a i2c_device at the supplied address
+ */
+static int i2c_check_for_device(struct em2820 *dev, unsigned char addr)
+{
+	char msg;
+	int ret;
+	msg = addr;
+
+	ret = dev->em2820_read_reg_req(dev, 2, addr);
+	if (ret < 0) {
+		em2820_warn("reading from i2c device failed (error=%i)\n", ret);
+		return ret;
+	}
+	if (dev->em2820_read_reg(dev, 0x5) != 0)
+		return -ENODEV;
+	return 0;
+}
+
+/*
+ * em2820_i2c_xfer()
+ * the main i2c transfer function
+ */
+static int em2820_i2c_xfer(struct i2c_adapter *i2c_adap,
+			   struct i2c_msg msgs[], int num)
+{
+	struct em2820 *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;
+		dprintk1("%s %s addr=%x len=%d:",
+			 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
+			 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
+		if (!msgs[i].len) {	/* no len: check only for device presence */
+			rc = i2c_check_for_device(dev, addr);
+			if (rc < 0) {
+				dprintk2(" no device\n");
+				return rc;
+			}
+
+		}
+		if (msgs[i].flags & I2C_M_RD) {
+			/* read bytes */
+
+			rc = i2c_recv_bytes(dev, addr, msgs[i].buf,
+					    msgs[i].len);
+			if (i2c_debug) {
+				for (byte = 0; byte < msgs[i].len; byte++) {
+					printk(" %02x", msgs[i].buf[byte]);
+				}
+			}
+		} else {
+			/* write bytes */
+			if (i2c_debug) {
+				for (byte = 0; byte < msgs[i].len; byte++)
+					printk(" %02x", msgs[i].buf[byte]);
+			}
+			rc = i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len,
+					    i == num - 1);
+			if (rc < 0)
+				goto err;
+		}
+		if (i2c_debug)
+			printk("\n");
+	}
+
+	return num;
+      err:
+	dprintk2(" ERROR: %i\n", rc);
+	return rc;
+}
+
+static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len)
+{
+	unsigned char buf, *p = eedata;
+	struct em2820_eeprom *em_eeprom = (void *)eedata;
+	int i, err, size = len, block;
+
+	dev->i2c_client.addr = 0xa0 >> 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");
+	}
+
+	printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
+	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;
+	}
+
+	return 0;
+}
+
+/* ----------------------------------------------------------- */
+
+/*
+ * algo_control()
+ */
+static int algo_control(struct i2c_adapter *adapter,
+			unsigned int cmd, unsigned long arg)
+{
+	return 0;
+}
+
+/*
+ * functionality()
+ */
+static u32 functionality(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_EMUL;
+}
+
+#ifndef I2C_PEC
+static void inc_use(struct i2c_adapter *adap)
+{
+	MOD_INC_USE_COUNT;
+}
+
+static void dec_use(struct i2c_adapter *adap)
+{
+	MOD_DEC_USE_COUNT;
+}
+#endif
+
+static int em2820_set_tuner(int check_eeprom, struct i2c_client *client)
+{
+	struct em2820 *dev = client->adapter->algo_data;
+
+	struct tuner_setup tun_setup;
+
+	/* tuner */
+	if (dev->has_tuner) {
+		tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+		tun_setup.type = dev->tuner_type;
+		tun_setup.addr = dev->tuner_addr;
+
+		em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
+	}
+	return (0);
+}
+
+/*
+ * 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 em2820 *dev = client->adapter->algo_data;
+
+	dprintk("address %x", client->addr << 1);
+	switch (client->addr << 1) {
+	case 0x68:
+		em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
+		break;
+	case 0x4a:
+		dprintk1("attach_inform: saa7113 detected.\n");
+		break;
+	case 0xa0:
+		dprintk1("attach_inform: eeprom detected.\n");
+		break;
+	case 0x80:
+	case 0x88:
+		dprintk1("attach_inform: msp34xx detected.\n");
+		break;
+	case 0xb8:
+	case 0xba:
+		dprintk1("attach_inform: tvp5150 detected.\n");
+		break;
+	default:
+		dev->tuner_addr = client->addr;
+		em2820_set_tuner(-1, client);
+	}
+
+	return 0;
+}
+
+static struct i2c_algorithm em2820_algo = {
+	.name          = "em2820",
+	.id            = I2C_HW_B_EM2820,
+	.master_xfer   = em2820_i2c_xfer,
+	.algo_control  = algo_control,
+	.functionality = functionality,
+};
+
+static struct i2c_adapter em2820_adap_template = {
+#ifdef I2C_PEC
+	.owner = THIS_MODULE,
+#else
+	.inc_use = inc_use,
+	.dec_use = dec_use,
+#endif
+#ifdef I2C_CLASS_TV_ANALOG
+	.class = I2C_CLASS_TV_ANALOG,
+#endif
+	.name = "em2820",
+	.id = I2C_HW_B_EM2820,
+	.algo = &em2820_algo,
+	.client_register = attach_inform,
+};
+
+static struct i2c_client em2820_client_template = {
+	.name = "em2820 internal",
+	.flags = I2C_CLIENT_ALLOW_USE,
+};
+
+/* ----------------------------------------------------------- */
+
+/*
+ * i2c_devs
+ * incomplete list of known devices
+ */
+static char *i2c_devs[128] = {
+	[0x4a >> 1] = "saa7113h",
+	[0x60 >> 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
+ */
+static void do_i2c_scan(char *name, struct i2c_client *c)
+{
+	unsigned char buf;
+	int i, rc;
+
+	for (i = 0; i < 128; i++) {
+		c->addr = i;
+		rc = i2c_master_recv(c, &buf, 0);
+		if (rc < 0)
+			continue;
+		printk(KERN_INFO "%s: found device @ 0x%x [%s]", name,
+		       i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
+	}
+}
+
+/*
+ * em2820_i2c_call_clients()
+ * send commands to all attached i2c devices
+ */
+void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg)
+{
+	BUG_ON(NULL == dev->i2c_adap.algo_data);
+	i2c_clients_command(&dev->i2c_adap, cmd, arg);
+}
+
+/*
+ * em2820_i2c_register()
+ * register i2c bus
+ */
+int em2820_i2c_register(struct em2820 *dev)
+{
+	BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg);
+	BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req);
+	dev->i2c_adap = em2820_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 = em2820_client_template;
+	dev->i2c_client.adapter = &dev->i2c_adap;
+
+	em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
+
+	if (i2c_scan)
+		do_i2c_scan(dev->name, &dev->i2c_client);
+	return 0;
+}
+
+/*
+ * em2820_i2c_unregister()
+ * unregister i2c_bus
+ */
+int em2820_i2c_unregister(struct em2820 *dev)
+{
+	i2c_del_adapter(&dev->i2c_adap);
+	return 0;
+}