diff options
Diffstat (limited to 'drivers/staging/media/usbvision/usbvision-i2c.c')
| -rw-r--r-- | drivers/staging/media/usbvision/usbvision-i2c.c | 438 |
1 files changed, 0 insertions, 438 deletions
diff --git a/drivers/staging/media/usbvision/usbvision-i2c.c b/drivers/staging/media/usbvision/usbvision-i2c.c deleted file mode 100644 index 6e4df3335b1b..000000000000 --- a/drivers/staging/media/usbvision/usbvision-i2c.c +++ /dev/null @@ -1,438 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * 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 - */ - - -#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 const struct i2c_algorithm usbvision_algo = { - .master_xfer = usbvision_i2c_xfer, - .smbus_xfer = NULL, - .functionality = functionality, -}; - - -/* ----------------------------------------------------------------------- */ -/* usbvision specific I2C functions */ -/* ----------------------------------------------------------------------- */ -static const 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; - - usbvision->i2c_adap = i2c_adap_template; - - snprintf(usbvision->i2c_adap.name, sizeof(usbvision->i2c_adap.name), - "usbvision-%d-%s", - 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); - /* fall through */ - case 3: - buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3); - /* fall through */ - case 2: - buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2); - /* fall through */ - 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 = usbvision->ctrl_urb_buffer; - 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 const struct i2c_adapter i2c_adap_template = { - .owner = THIS_MODULE, - .name = "usbvision", -}; |