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Diffstat (limited to 'drivers/media/usb/usbvision/usbvision-i2c.c')
-rw-r--r--drivers/media/usb/usbvision/usbvision-i2c.c456
1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/media/usb/usbvision/usbvision-i2c.c b/drivers/media/usb/usbvision/usbvision-i2c.c
new file mode 100644
index 000000000000..89fec029e924
--- /dev/null
+++ b/drivers/media/usb/usbvision/usbvision-i2c.c
@@ -0,0 +1,456 @@
+/*
+ * usbvision_i2c.c
+ * i2c algorithm for USB-I2C Bridges
+ *
+ * Copyright (c) 1999-2007 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/init.h>
+#include <linux/uaccess.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include "usbvision.h"
+
+#define DBG_I2C (1 << 0)
+
+static int i2c_debug;
+
+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)) \
+ printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
+ __func__, __LINE__ , ## args); \
+ }
+
+static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
+ short len);
+static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
+ short len);
+
+static inline int try_write_address(struct i2c_adapter *i2c_adap,
+ unsigned char addr, int retries)
+{
+ struct usb_usbvision *usbvision;
+ int i, ret = -1;
+ char buf[4];
+
+ usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
+ buf[0] = 0x00;
+ for (i = 0; i <= retries; i++) {
+ ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
+ if (ret == 1)
+ break; /* success! */
+ udelay(5);
+ if (i == retries) /* no success */
+ break;
+ udelay(10);
+ }
+ if (i) {
+ PDEBUG(DBG_I2C, "Needed %d retries for address %#2x", i, addr);
+ PDEBUG(DBG_I2C, "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)
+{
+ struct usb_usbvision *usbvision;
+ int i, ret = -1;
+ char buf[4];
+
+ usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
+ for (i = 0; i <= retries; i++) {
+ ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
+ if (ret == 1)
+ break; /* success! */
+ udelay(5);
+ if (i == retries) /* no success */
+ break;
+ udelay(10);
+ }
+ if (i) {
+ PDEBUG(DBG_I2C, "Needed %d retries for address %#2x", i, addr);
+ PDEBUG(DBG_I2C, "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;
+
+ addr = (msg->addr << 1);
+ if (flags & I2C_M_RD)
+ 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
+usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
+{
+ struct i2c_msg *pmsg;
+ struct usb_usbvision *usbvision;
+ int i, ret;
+ unsigned char addr = 0;
+
+ usbvision = (struct usb_usbvision *)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_I2C, "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(usbvision, addr, pmsg->buf, pmsg->len));
+ if (ret < pmsg->len)
+ return (ret < 0) ? ret : -EREMOTEIO;
+ } else {
+ /* write bytes from buffer */
+ ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
+ if (ret < pmsg->len)
+ return (ret < 0) ? ret : -EREMOTEIO;
+ }
+ }
+ return num;
+}
+
+static u32 functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+/* -----exported algorithm data: ------------------------------------- */
+
+static struct i2c_algorithm usbvision_algo = {
+ .master_xfer = usbvision_i2c_xfer,
+ .smbus_xfer = NULL,
+ .functionality = functionality,
+};
+
+
+/* ----------------------------------------------------------------------- */
+/* usbvision specific I2C functions */
+/* ----------------------------------------------------------------------- */
+static struct i2c_adapter i2c_adap_template;
+
+int usbvision_i2c_register(struct usb_usbvision *usbvision)
+{
+ static unsigned short saa711x_addrs[] = {
+ 0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
+ 0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
+ I2C_CLIENT_END };
+
+ if (usbvision->registered_i2c)
+ return 0;
+
+ memcpy(&usbvision->i2c_adap, &i2c_adap_template,
+ sizeof(struct i2c_adapter));
+
+ sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name,
+ usbvision->dev->bus->busnum, usbvision->dev->devpath);
+ PDEBUG(DBG_I2C, "Adaptername: %s", usbvision->i2c_adap.name);
+ usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
+
+ i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);
+
+ if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
+ printk(KERN_ERR "usbvision_i2c_register: can't write reg\n");
+ return -EBUSY;
+ }
+
+ PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
+ PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
+
+ /* register new adapter to i2c module... */
+
+ usbvision->i2c_adap.algo = &usbvision_algo;
+
+ usbvision->i2c_adap.timeout = 100; /* default values, should */
+ usbvision->i2c_adap.retries = 3; /* be replaced by defines */
+
+ i2c_add_adapter(&usbvision->i2c_adap);
+
+ PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name);
+
+ /* Request the load of the i2c modules we need */
+ switch (usbvision_device_data[usbvision->dev_model].codec) {
+ case CODEC_SAA7113:
+ case CODEC_SAA7111:
+ /* Without this delay the detection of the saa711x is
+ hit-and-miss. */
+ mdelay(10);
+ v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
+ &usbvision->i2c_adap,
+ "saa7115_auto", 0, saa711x_addrs);
+ break;
+ }
+ if (usbvision_device_data[usbvision->dev_model].tuner == 1) {
+ struct v4l2_subdev *sd;
+ enum v4l2_i2c_tuner_type type;
+ struct tuner_setup tun_setup;
+
+ sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
+ &usbvision->i2c_adap,
+ "tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
+ /* depending on whether we found a demod or not, select
+ the tuner type. */
+ type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
+
+ sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
+ &usbvision->i2c_adap,
+ "tuner", 0, v4l2_i2c_tuner_addrs(type));
+
+ if (sd == NULL)
+ return -ENODEV;
+ if (usbvision->tuner_type != -1) {
+ tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
+ tun_setup.type = usbvision->tuner_type;
+ tun_setup.addr = v4l2_i2c_subdev_addr(sd);
+ call_all(usbvision, tuner, s_type_addr, &tun_setup);
+ }
+ }
+ usbvision->registered_i2c = 1;
+
+ return 0;
+}
+
+int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
+{
+ if (!usbvision->registered_i2c)
+ return 0;
+
+ i2c_del_adapter(&(usbvision->i2c_adap));
+ usbvision->registered_i2c = 0;
+
+ PDEBUG(DBG_I2C, "i2c bus for %s unregistered", usbvision->i2c_adap.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(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
+ short len)
+{
+ char *buf_ptr = buf;
+ int retval;
+ int wrcount = 0;
+ int count;
+ int max_len = 4;
+
+ while (len > 0) {
+ count = (len > max_len) ? max_len : len;
+ retval = usbvision_i2c_write_max4(usbvision, addr, buf_ptr, count);
+ if (retval > 0) {
+ len -= count;
+ buf_ptr += count;
+ wrcount += count;
+ } else
+ return (retval < 0) ? retval : -EFAULT;
+ }
+ return wrcount;
+}
+
+static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
+ short len)
+{
+ char temp[4];
+ int retval, i;
+ int rdcount = 0;
+ int count;
+
+ 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",
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
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