diff options
Diffstat (limited to 'drivers/media/video/au0828/au0828-i2c.c')
-rw-r--r-- | drivers/media/video/au0828/au0828-i2c.c | 401 |
1 files changed, 0 insertions, 401 deletions
diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c deleted file mode 100644 index 4ded17fe1957..000000000000 --- a/drivers/media/video/au0828/au0828-i2c.c +++ /dev/null @@ -1,401 +0,0 @@ -/* - * Driver for the Auvitek AU0828 USB bridge - * - * Copyright (c) 2008 Steven Toth <stoth@linuxtv.org> - * - * 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/moduleparam.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/io.h> - -#include "au0828.h" -#include "media/tuner.h" -#include <media/v4l2-common.h> - -static int i2c_scan; -module_param(i2c_scan, int, 0444); -MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); - -#define I2C_WAIT_DELAY 25 -#define I2C_WAIT_RETRY 1000 - -static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - return au0828_read(dev, AU0828_I2C_STATUS_201) & - AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1; -} - -static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - return au0828_read(dev, AU0828_I2C_STATUS_201) & - AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1; -} - -static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap) -{ - int count; - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - if (!i2c_slave_did_read_ack(i2c_adap)) - break; - udelay(I2C_WAIT_DELAY); - } - - if (I2C_WAIT_RETRY == count) - return 0; - - return 1; -} - -static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - return au0828_read(dev, AU0828_I2C_STATUS_201) & - AU0828_I2C_STATUS_READ_DONE ? 0 : 1; -} - -static int i2c_wait_read_done(struct i2c_adapter *i2c_adap) -{ - int count; - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - if (!i2c_is_read_busy(i2c_adap)) - break; - udelay(I2C_WAIT_DELAY); - } - - if (I2C_WAIT_RETRY == count) - return 0; - - return 1; -} - -static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - return au0828_read(dev, AU0828_I2C_STATUS_201) & - AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0; -} - -static int i2c_wait_write_done(struct i2c_adapter *i2c_adap) -{ - int count; - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - if (i2c_is_write_done(i2c_adap)) - break; - udelay(I2C_WAIT_DELAY); - } - - if (I2C_WAIT_RETRY == count) - return 0; - - return 1; -} - -static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - return au0828_read(dev, AU0828_I2C_STATUS_201) & - AU0828_I2C_STATUS_BUSY ? 1 : 0; -} - -static int i2c_wait_done(struct i2c_adapter *i2c_adap) -{ - int count; - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - if (!i2c_is_busy(i2c_adap)) - break; - udelay(I2C_WAIT_DELAY); - } - - if (I2C_WAIT_RETRY == count) - return 0; - - return 1; -} - -/* FIXME: Implement join handling correctly */ -static int i2c_sendbytes(struct i2c_adapter *i2c_adap, - const struct i2c_msg *msg, int joined_rlen) -{ - int i, strobe = 0; - struct au0828_dev *dev = i2c_adap->algo_data; - - dprintk(4, "%s()\n", __func__); - - au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); - - /* Set the I2C clock */ - if (((dev->board.tuner_type == TUNER_XC5000) || - (dev->board.tuner_type == TUNER_XC5000C)) && - (dev->board.tuner_addr == msg->addr) && - (msg->len == 64)) { - /* Hack to speed up firmware load. The xc5000 lets us do up - to 400 KHz when in firmware download mode */ - au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, - AU0828_I2C_CLK_250KHZ); - } else { - /* Use the i2c clock speed in the board configuration */ - au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, - dev->board.i2c_clk_divider); - } - - /* Hardware needs 8 bit addresses */ - au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); - - dprintk(4, "SEND: %02x\n", msg->addr); - - /* Deal with i2c_scan */ - if (msg->len == 0) { - /* The analog tuner detection code makes use of the SMBUS_QUICK - message (which involves a zero length i2c write). To avoid - checking the status register when we didn't strobe out any - actual bytes to the bus, just do a read check. This is - consistent with how I saw i2c device checking done in the - USB trace of the Windows driver */ - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_READ); - - if (!i2c_wait_done(i2c_adap)) - return -EIO; - - if (i2c_wait_read_ack(i2c_adap)) - return -EIO; - - return 0; - } - - for (i = 0; i < msg->len;) { - - dprintk(4, " %02x\n", msg->buf[i]); - - au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]); - - strobe++; - i++; - - if ((strobe >= 4) || (i >= msg->len)) { - - /* Strobe the byte into the bus */ - if (i < msg->len) - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_WRITE | - AU0828_I2C_TRIGGER_HOLD); - else - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_WRITE); - - /* Reset strobe trigger */ - strobe = 0; - - if (!i2c_wait_write_done(i2c_adap)) - return -EIO; - - } - - } - if (!i2c_wait_done(i2c_adap)) - return -EIO; - - dprintk(4, "\n"); - - return msg->len; -} - -/* FIXME: Implement join handling correctly */ -static int i2c_readbytes(struct i2c_adapter *i2c_adap, - const struct i2c_msg *msg, int joined) -{ - struct au0828_dev *dev = i2c_adap->algo_data; - int i; - - dprintk(4, "%s()\n", __func__); - - au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); - - /* Set the I2C clock */ - au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, - dev->board.i2c_clk_divider); - - /* Hardware needs 8 bit addresses */ - au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); - - dprintk(4, " RECV:\n"); - - /* Deal with i2c_scan */ - if (msg->len == 0) { - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_READ); - - if (i2c_wait_read_ack(i2c_adap)) - return -EIO; - return 0; - } - - for (i = 0; i < msg->len;) { - - i++; - - if (i < msg->len) - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_READ | - AU0828_I2C_TRIGGER_HOLD); - else - au0828_write(dev, AU0828_I2C_TRIGGER_200, - AU0828_I2C_TRIGGER_READ); - - if (!i2c_wait_read_done(i2c_adap)) - return -EIO; - - msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) & - 0xff; - - dprintk(4, " %02x\n", msg->buf[i-1]); - } - if (!i2c_wait_done(i2c_adap)) - return -EIO; - - dprintk(4, "\n"); - - return msg->len; -} - -static int i2c_xfer(struct i2c_adapter *i2c_adap, - struct i2c_msg *msgs, int num) -{ - int i, retval = 0; - - dprintk(4, "%s(num = %d)\n", __func__, num); - - for (i = 0; i < num; i++) { - dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n", - __func__, num, msgs[i].addr, msgs[i].len); - if (msgs[i].flags & I2C_M_RD) { - /* read */ - retval = i2c_readbytes(i2c_adap, &msgs[i], 0); - } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && - msgs[i].addr == msgs[i + 1].addr) { - /* write then read from same address */ - retval = i2c_sendbytes(i2c_adap, &msgs[i], - msgs[i + 1].len); - if (retval < 0) - goto err; - i++; - retval = i2c_readbytes(i2c_adap, &msgs[i], 1); - } else { - /* write */ - retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); - } - if (retval < 0) - goto err; - } - return num; - -err: - return retval; -} - -static u32 au0828_functionality(struct i2c_adapter *adap) -{ - return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; -} - -static struct i2c_algorithm au0828_i2c_algo_template = { - .master_xfer = i2c_xfer, - .functionality = au0828_functionality, -}; - -/* ----------------------------------------------------------------------- */ - -static struct i2c_adapter au0828_i2c_adap_template = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - .algo = &au0828_i2c_algo_template, -}; - -static struct i2c_client au0828_i2c_client_template = { - .name = "au0828 internal", -}; - -static char *i2c_devs[128] = { - [0x8e >> 1] = "au8522", - [0xa0 >> 1] = "eeprom", - [0xc2 >> 1] = "tuner/xc5000", -}; - -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: i2c scan: found device @ 0x%x [%s]\n", - name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); - } -} - -/* init + register i2c adapter */ -int au0828_i2c_register(struct au0828_dev *dev) -{ - dprintk(1, "%s()\n", __func__); - - memcpy(&dev->i2c_adap, &au0828_i2c_adap_template, - sizeof(dev->i2c_adap)); - memcpy(&dev->i2c_algo, &au0828_i2c_algo_template, - sizeof(dev->i2c_algo)); - memcpy(&dev->i2c_client, &au0828_i2c_client_template, - sizeof(dev->i2c_client)); - - dev->i2c_adap.dev.parent = &dev->usbdev->dev; - - strlcpy(dev->i2c_adap.name, DRIVER_NAME, - sizeof(dev->i2c_adap.name)); - - dev->i2c_adap.algo = &dev->i2c_algo; - dev->i2c_adap.algo_data = dev; - i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); - i2c_add_adapter(&dev->i2c_adap); - - dev->i2c_client.adapter = &dev->i2c_adap; - - if (0 == dev->i2c_rc) { - printk(KERN_INFO "%s: i2c bus registered\n", DRIVER_NAME); - if (i2c_scan) - do_i2c_scan(DRIVER_NAME, &dev->i2c_client); - } else - printk(KERN_INFO "%s: i2c bus register FAILED\n", DRIVER_NAME); - - return dev->i2c_rc; -} - -int au0828_i2c_unregister(struct au0828_dev *dev) -{ - i2c_del_adapter(&dev->i2c_adap); - return 0; -} - |