| /* |
| * 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 <asm/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; |
| 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) { |
| dev_err(&i2c_adap->dev, |
| "died at extended address code, while writing\n"); |
| 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) { |
| dev_err(&i2c_adap->dev, |
| "died at extended address code, while reading\n"); |
| return -EREMOTEIO; |
| } |
| } |
| |
| } else { /* normal 7bit address */ |
| 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_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; |
| } |
| |
| /* -----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 }; |
| |
| 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_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->DevModel].Codec) { |
| case CODEC_SAA7113: |
| case CODEC_SAA7111: |
| v4l2_i2c_new_subdev(&usbvision->v4l2_dev, |
| &usbvision->i2c_adap, "saa7115", |
| "saa7115_auto", 0, saa711x_addrs); |
| break; |
| } |
| if (usbvision_device_data[usbvision->DevModel].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", |
| "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", |
| "tuner", 0, v4l2_i2c_tuner_addrs(type)); |
| |
| 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); |
| } |
| } |
| |
| return 0; |
| } |
| |
| int usbvision_i2c_unregister(struct usb_usbvision *usbvision) |
| { |
| |
| i2c_del_adapter(&(usbvision->i2c_adap)); |
| |
| 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 *bufPtr = buf; |
| int retval; |
| int wrcount = 0; |
| int count; |
| int maxLen = 4; |
| |
| 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(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: |
| */ |