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Diffstat (limited to 'drivers/media/video/usbvision/usbvision-i2c.c')
-rw-r--r--drivers/media/video/usbvision/usbvision-i2c.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/drivers/media/video/usbvision/usbvision-i2c.c b/drivers/media/video/usbvision/usbvision-i2c.c
new file mode 100644
index 00000000000..858252c1508
--- /dev/null
+++ b/drivers/media/video/usbvision/usbvision-i2c.c
@@ -0,0 +1,552 @@
+/*
+ * I2C_ALGO_USB.C
+ * i2c algorithm for USB-I2C Bridges
+ *
+ * Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
+ * Dwaine Garden <dwainegarden@rogers.com>
+ *
+ * This module is part of usbvision driver project.
+ * Updates to driver completed by Dwaine P. Garden
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include "usbvision.h"
+
+#define DBG_I2C 1<<0
+#define DBG_ALGO 1<<1
+
+static int i2c_debug = 0;
+
+module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
+MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
+
+#define PDEBUG(level, fmt, args...) \
+ if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)
+
+static int usbvision_i2c_write(void *data, unsigned char addr, char *buf,
+ short len);
+static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
+ short len);
+
+static inline int try_write_address(struct i2c_adapter *i2c_adap,
+ unsigned char addr, int retries)
+{
+ void *data;
+ int i, ret = -1;
+ char buf[4];
+
+ data = i2c_get_adapdata(i2c_adap);
+ buf[0] = 0x00;
+ for (i = 0; i <= retries; i++) {
+ ret = (usbvision_i2c_write(data, addr, buf, 1));
+ if (ret == 1)
+ break; /* success! */
+ udelay(5);
+ if (i == retries) /* no success */
+ break;
+ udelay(10);
+ }
+ if (i) {
+ PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
+ PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
+ }
+ return ret;
+}
+
+static inline int try_read_address(struct i2c_adapter *i2c_adap,
+ unsigned char addr, int retries)
+{
+ void *data;
+ int i, ret = -1;
+ char buf[4];
+
+ data = i2c_get_adapdata(i2c_adap);
+ for (i = 0; i <= retries; i++) {
+ ret = (usbvision_i2c_read(data, addr, buf, 1));
+ if (ret == 1)
+ break; /* success! */
+ udelay(5);
+ if (i == retries) /* no success */
+ break;
+ udelay(10);
+ }
+ if (i) {
+ PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
+ PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
+ }
+ return ret;
+}
+
+static inline int usb_find_address(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msg, int retries,
+ unsigned char *add)
+{
+ unsigned short flags = msg->flags;
+
+ unsigned char addr;
+ int ret;
+ if ((flags & I2C_M_TEN)) {
+ /* a ten bit address */
+ addr = 0xf0 | ((msg->addr >> 7) & 0x03);
+ /* try extended address code... */
+ ret = try_write_address(i2c_adap, addr, retries);
+ if (ret != 1) {
+ err("died at extended address code, while writing");
+ return -EREMOTEIO;
+ }
+ add[0] = addr;
+ if (flags & I2C_M_RD) {
+ /* okay, now switch into reading mode */
+ addr |= 0x01;
+ ret = try_read_address(i2c_adap, addr, retries);
+ if (ret != 1) {
+ err("died at extended address code, while reading");
+ return -EREMOTEIO;
+ }
+ }
+
+ } else { /* normal 7bit address */
+ addr = (msg->addr << 1);
+ if (flags & I2C_M_RD)
+ addr |= 1;
+ if (flags & I2C_M_REV_DIR_ADDR)
+ addr ^= 1;
+
+ add[0] = addr;
+ if (flags & I2C_M_RD)
+ ret = try_read_address(i2c_adap, addr, retries);
+ else
+ ret = try_write_address(i2c_adap, addr, retries);
+
+ if (ret != 1) {
+ return -EREMOTEIO;
+ }
+ }
+ return 0;
+}
+
+static int
+usb_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
+{
+ struct i2c_msg *pmsg;
+ void *data;
+ int i, ret;
+ unsigned char addr;
+
+ data = i2c_get_adapdata(i2c_adap);
+
+ for (i = 0; i < num; i++) {
+ pmsg = &msgs[i];
+ ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
+ if (ret != 0) {
+ PDEBUG(DBG_ALGO,"got NAK from device, message #%d", i);
+ return (ret < 0) ? ret : -EREMOTEIO;
+ }
+
+ if (pmsg->flags & I2C_M_RD) {
+ /* read bytes into buffer */
+ ret = (usbvision_i2c_read(data, addr, pmsg->buf, pmsg->len));
+ if (ret < pmsg->len) {
+ return (ret < 0) ? ret : -EREMOTEIO;
+ }
+ } else {
+ /* write bytes from buffer */
+ ret = (usbvision_i2c_write(data, addr, pmsg->buf, pmsg->len));
+ if (ret < pmsg->len) {
+ return (ret < 0) ? ret : -EREMOTEIO;
+ }
+ }
+ }
+ return num;
+}
+
+static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+static u32 usb_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+
+/* -----exported algorithm data: ------------------------------------- */
+
+static struct i2c_algorithm i2c_usb_algo = {
+ .master_xfer = usb_xfer,
+ .smbus_xfer = NULL,
+ .algo_control = algo_control,
+ .functionality = usb_func,
+};
+
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
+{
+ PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
+ PDEBUG(DBG_ALGO, "ALGO debugging is enabled [i2c]");
+
+ /* register new adapter to i2c module... */
+
+ adap->algo = &i2c_usb_algo;
+
+ adap->timeout = 100; /* default values, should */
+ adap->retries = 3; /* be replaced by defines */
+
+ i2c_add_adapter(adap);
+
+ PDEBUG(DBG_ALGO,"i2c bus for %s registered", adap->name);
+
+ return 0;
+}
+
+
+int usbvision_i2c_usb_del_bus(struct i2c_adapter *adap)
+{
+
+ i2c_del_adapter(adap);
+
+ PDEBUG(DBG_ALGO,"i2c bus for %s unregistered", adap->name);
+
+ return 0;
+}
+
+
+/* ----------------------------------------------------------------------- */
+/* usbvision specific I2C functions */
+/* ----------------------------------------------------------------------- */
+static struct i2c_adapter i2c_adap_template;
+static struct i2c_client i2c_client_template;
+
+int usbvision_init_i2c(struct usb_usbvision *usbvision)
+{
+ memcpy(&usbvision->i2c_adap, &i2c_adap_template,
+ sizeof(struct i2c_adapter));
+ memcpy(&usbvision->i2c_client, &i2c_client_template,
+ sizeof(struct i2c_client));
+
+ sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
+ " #%d", usbvision->vdev->minor & 0x1f);
+ PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
+
+ i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
+ i2c_set_clientdata(&usbvision->i2c_client, usbvision);
+
+ usbvision->i2c_client.adapter = &usbvision->i2c_adap;
+
+ if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
+ printk(KERN_ERR "usbvision_init_i2c: can't write reg\n");
+ return -EBUSY;
+ }
+
+#ifdef CONFIG_MODULES
+ /* Request the load of the i2c modules we need */
+ switch (usbvision_device_data[usbvision->DevModel].Codec) {
+ case CODEC_SAA7113:
+ request_module("saa7115");
+ break;
+ case CODEC_SAA7111:
+ request_module("saa7115");
+ break;
+ }
+ if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
+ request_module("tuner");
+ }
+#endif
+
+ return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
+}
+
+void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
+ void *arg)
+{
+ i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
+}
+
+static int attach_inform(struct i2c_client *client)
+{
+ struct usb_usbvision *usbvision;
+
+ usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
+
+ switch (client->addr << 1) {
+ case 0x43:
+ case 0x4b:
+ {
+ struct tuner_setup tun_setup;
+
+ tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+ tun_setup.type = TUNER_TDA9887;
+ tun_setup.addr = client->addr;
+
+ call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
+
+ break;
+ }
+ case 0x42:
+ PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
+ break;
+ case 0x4a:
+ PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
+ break;
+ case 0x48:
+ PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
+ break;
+ case 0xa0:
+ PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
+ break;
+
+ default:
+ {
+ struct tuner_setup tun_setup;
+
+ PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
+ usbvision->tuner_addr = client->addr;
+
+ if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
+ tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+ tun_setup.type = usbvision->tuner_type;
+ tun_setup.addr = usbvision->tuner_addr;
+ call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
+ }
+ }
+ break;
+ }
+ return 0;
+}
+
+static int detach_inform(struct i2c_client *client)
+{
+ struct usb_usbvision *usbvision;
+
+ usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
+
+ PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
+ return 0;
+}
+
+static int
+usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
+ char *buf, short len)
+{
+ int rc, retries;
+
+ for (retries = 5;;) {
+ rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
+ if (rc < 0)
+ return rc;
+
+ /* Initiate byte read cycle */
+ /* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
+ /* d3 0=Wr 1=Rd */
+ rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
+ (len & 0x07) | 0x18);
+ if (rc < 0)
+ return rc;
+
+ /* Test for Busy and ACK */
+ do {
+ /* USBVISION_SER_CONT -> d4 == 0 busy */
+ rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
+ } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
+ if (rc < 0)
+ return rc;
+
+ /* USBVISION_SER_CONT -> d5 == 1 Not ack */
+ if ((rc & 0x20) == 0) /* Ack? */
+ break;
+
+ /* I2C abort */
+ rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
+ if (rc < 0)
+ return rc;
+
+ if (--retries < 0)
+ return -1;
+ }
+
+ switch (len) {
+ case 4:
+ buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
+ case 3:
+ buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
+ case 2:
+ buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
+ case 1:
+ buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
+ break;
+ default:
+ printk(KERN_ERR
+ "usbvision_i2c_read_max4: buffer length > 4\n");
+ }
+
+ if (i2c_debug & DBG_I2C) {
+ int idx;
+ for (idx = 0; idx < len; idx++) {
+ PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
+ }
+ }
+ return len;
+}
+
+
+static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
+ unsigned char addr, const char *buf,
+ short len)
+{
+ int rc, retries;
+ int i;
+ unsigned char value[6];
+ unsigned char ser_cont;
+
+ ser_cont = (len & 0x07) | 0x10;
+
+ value[0] = addr;
+ value[1] = ser_cont;
+ for (i = 0; i < len; i++)
+ value[i + 2] = buf[i];
+
+ for (retries = 5;;) {
+ rc = usb_control_msg(usbvision->dev,
+ usb_sndctrlpipe(usbvision->dev, 1),
+ USBVISION_OP_CODE,
+ USB_DIR_OUT | USB_TYPE_VENDOR |
+ USB_RECIP_ENDPOINT, 0,
+ (__u16) USBVISION_SER_ADRS, value,
+ len + 2, HZ);
+
+ if (rc < 0)
+ return rc;
+
+ rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
+ (len & 0x07) | 0x10);
+ if (rc < 0)
+ return rc;
+
+ /* Test for Busy and ACK */
+ do {
+ rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
+ } while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
+ if (rc < 0)
+ return rc;
+
+ if ((rc & 0x20) == 0) /* Ack? */
+ break;
+
+ /* I2C abort */
+ usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
+
+ if (--retries < 0)
+ return -1;
+
+ }
+
+ if (i2c_debug & DBG_I2C) {
+ int idx;
+ for (idx = 0; idx < len; idx++) {
+ PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
+ }
+ }
+ return len;
+}
+
+static int usbvision_i2c_write(void *data, unsigned char addr, char *buf,
+ short len)
+{
+ char *bufPtr = buf;
+ int retval;
+ int wrcount = 0;
+ int count;
+ int maxLen = 4;
+ struct usb_usbvision *usbvision = (struct usb_usbvision *) data;
+
+ while (len > 0) {
+ count = (len > maxLen) ? maxLen : len;
+ retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
+ if (retval > 0) {
+ len -= count;
+ bufPtr += count;
+ wrcount += count;
+ } else
+ return (retval < 0) ? retval : -EFAULT;
+ }
+ return wrcount;
+}
+
+static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
+ short len)
+{
+ char temp[4];
+ int retval, i;
+ int rdcount = 0;
+ int count;
+ struct usb_usbvision *usbvision = (struct usb_usbvision *) data;
+
+ while (len > 0) {
+ count = (len > 3) ? 4 : len;
+ retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
+ if (retval > 0) {
+ for (i = 0; i < len; i++)
+ buf[rdcount + i] = temp[i];
+ len -= count;
+ rdcount += count;
+ } else
+ return (retval < 0) ? retval : -EFAULT;
+ }
+ return rdcount;
+}
+
+static struct i2c_adapter i2c_adap_template = {
+ .owner = THIS_MODULE,
+ .name = "usbvision",
+ .id = I2C_HW_B_BT848, /* FIXME */
+ .client_register = attach_inform,
+ .client_unregister = detach_inform,
+#ifdef I2C_ADAP_CLASS_TV_ANALOG
+ .class = I2C_ADAP_CLASS_TV_ANALOG,
+#else
+ .class = I2C_CLASS_TV_ANALOG,
+#endif
+};
+
+static struct i2c_client i2c_client_template = {
+ .name = "usbvision internal",
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
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