--- /dev/null
+/*
+ * mxl111sf-i2c.c - driver for the MaxLinear MXL111SF
+ *
+ * Copyright (C) 2010-2014 Michael Krufky <mkrufky@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 "mxl111sf-i2c.h"
+#include "mxl111sf.h"
+
+/* SW-I2C ----------------------------------------------------------------- */
+
+#define SW_I2C_ADDR 0x1a
+#define SW_I2C_EN 0x02
+#define SW_SCL_OUT 0x04
+#define SW_SDA_OUT 0x08
+#define SW_SDA_IN 0x04
+
+#define SW_I2C_BUSY_ADDR 0x2f
+#define SW_I2C_BUSY 0x02
+
+static int mxl111sf_i2c_bitbang_sendbyte(struct mxl111sf_state *state,
+ u8 byte)
+{
+ int i, ret;
+ u8 data = 0;
+
+ mxl_i2c("(0x%02x)", byte);
+
+ ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+ if (mxl_fail(ret))
+ goto fail;
+
+ for (i = 0; i < 8; i++) {
+
+ data = (byte & (0x80 >> i)) ? SW_SDA_OUT : 0;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | data);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | data | SW_SCL_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | data);
+ if (mxl_fail(ret))
+ goto fail;
+ }
+
+ /* last bit was 0 so we need to release SDA */
+ if (!(byte & 1)) {
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+ }
+
+ /* CLK high for ACK readback */
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+ if (mxl_fail(ret))
+ goto fail;
+
+ /* drop the CLK after getting ACK, SDA will go high right away */
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ if (data & SW_SDA_IN)
+ ret = -EIO;
+fail:
+ return ret;
+}
+
+static int mxl111sf_i2c_bitbang_recvbyte(struct mxl111sf_state *state,
+ u8 *pbyte)
+{
+ int i, ret;
+ u8 byte = 0;
+ u8 data = 0;
+
+ mxl_i2c("()");
+
+ *pbyte = 0;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ for (i = 0; i < 8; i++) {
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN |
+ SW_SCL_OUT | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &data);
+ if (mxl_fail(ret))
+ goto fail;
+
+ if (data & SW_SDA_IN)
+ byte |= (0x80 >> i);
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+ }
+ *pbyte = byte;
+fail:
+ return ret;
+}
+
+static int mxl111sf_i2c_start(struct mxl111sf_state *state)
+{
+ int ret;
+
+ mxl_i2c("()");
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN); /* start */
+ mxl_fail(ret);
+fail:
+ return ret;
+}
+
+static int mxl111sf_i2c_stop(struct mxl111sf_state *state)
+{
+ int ret;
+
+ mxl_i2c("()");
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN); /* stop */
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_SCL_OUT | SW_SDA_OUT);
+ mxl_fail(ret);
+fail:
+ return ret;
+}
+
+static int mxl111sf_i2c_ack(struct mxl111sf_state *state)
+{
+ int ret;
+ u8 b = 0;
+
+ mxl_i2c("()");
+
+ ret = mxl111sf_read_reg(state, SW_I2C_BUSY_ADDR, &b);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN);
+ if (mxl_fail(ret))
+ goto fail;
+
+ /* pull SDA low */
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ mxl_fail(ret);
+fail:
+ return ret;
+}
+
+static int mxl111sf_i2c_nack(struct mxl111sf_state *state)
+{
+ int ret;
+
+ mxl_i2c("()");
+
+ /* SDA high to signal last byte read from slave */
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SCL_OUT | SW_SDA_OUT);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_write_reg(state, SW_I2C_ADDR,
+ 0x10 | SW_I2C_EN | SW_SDA_OUT);
+ mxl_fail(ret);
+fail:
+ return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_i2c_sw_xfer_msg(struct mxl111sf_state *state,
+ struct i2c_msg *msg)
+{
+ int i, ret;
+
+ mxl_i2c("()");
+
+ if (msg->flags & I2C_M_RD) {
+
+ ret = mxl111sf_i2c_start(state);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_i2c_bitbang_sendbyte(state,
+ (msg->addr << 1) | 0x01);
+ if (mxl_fail(ret)) {
+ mxl111sf_i2c_stop(state);
+ goto fail;
+ }
+
+ for (i = 0; i < msg->len; i++) {
+ ret = mxl111sf_i2c_bitbang_recvbyte(state,
+ &msg->buf[i]);
+ if (mxl_fail(ret)) {
+ mxl111sf_i2c_stop(state);
+ goto fail;
+ }
+
+ if (i < msg->len - 1)
+ mxl111sf_i2c_ack(state);
+ }
+
+ mxl111sf_i2c_nack(state);
+
+ ret = mxl111sf_i2c_stop(state);
+ if (mxl_fail(ret))
+ goto fail;
+
+ } else {
+
+ ret = mxl111sf_i2c_start(state);
+ if (mxl_fail(ret))
+ goto fail;
+
+ ret = mxl111sf_i2c_bitbang_sendbyte(state,
+ (msg->addr << 1) & 0xfe);
+ if (mxl_fail(ret)) {
+ mxl111sf_i2c_stop(state);
+ goto fail;
+ }
+
+ for (i = 0; i < msg->len; i++) {
+ ret = mxl111sf_i2c_bitbang_sendbyte(state,
+ msg->buf[i]);
+ if (mxl_fail(ret)) {
+ mxl111sf_i2c_stop(state);
+ goto fail;
+ }
+ }
+
+ /* FIXME: we only want to do this on the last transaction */
+ mxl111sf_i2c_stop(state);
+ }
+fail:
+ return ret;
+}
+
+/* HW-I2C ----------------------------------------------------------------- */
+
+#define USB_WRITE_I2C_CMD 0x99
+#define USB_READ_I2C_CMD 0xdd
+#define USB_END_I2C_CMD 0xfe
+
+#define USB_WRITE_I2C_CMD_LEN 26
+#define USB_READ_I2C_CMD_LEN 24
+
+#define I2C_MUX_REG 0x30
+#define I2C_CONTROL_REG 0x00
+#define I2C_SLAVE_ADDR_REG 0x08
+#define I2C_DATA_REG 0x0c
+#define I2C_INT_STATUS_REG 0x10
+
+static int mxl111sf_i2c_send_data(struct mxl111sf_state *state,
+ u8 index, u8 *wdata)
+{
+ int ret = mxl111sf_ctrl_msg(state->d, wdata[0],
+ &wdata[1], 25, NULL, 0);
+ mxl_fail(ret);
+
+ return ret;
+}
+
+static int mxl111sf_i2c_get_data(struct mxl111sf_state *state,
+ u8 index, u8 *wdata, u8 *rdata)
+{
+ int ret = mxl111sf_ctrl_msg(state->d, wdata[0],
+ &wdata[1], 25, rdata, 24);
+ mxl_fail(ret);
+
+ return ret;
+}
+
+static u8 mxl111sf_i2c_check_status(struct mxl111sf_state *state)
+{
+ u8 status = 0;
+ u8 buf[26];
+
+ mxl_i2c_adv("()");
+
+ buf[0] = USB_READ_I2C_CMD;
+ buf[1] = 0x00;
+
+ buf[2] = I2C_INT_STATUS_REG;
+ buf[3] = 0x00;
+ buf[4] = 0x00;
+
+ buf[5] = USB_END_I2C_CMD;
+
+ mxl111sf_i2c_get_data(state, 0, buf, buf);
+
+ if (buf[1] & 0x04)
+ status = 1;
+
+ return status;
+}
+
+static u8 mxl111sf_i2c_check_fifo(struct mxl111sf_state *state)
+{
+ u8 status = 0;
+ u8 buf[26];
+
+ mxl_i2c("()");
+
+ buf[0] = USB_READ_I2C_CMD;
+ buf[1] = 0x00;
+
+ buf[2] = I2C_MUX_REG;
+ buf[3] = 0x00;
+ buf[4] = 0x00;
+
+ buf[5] = I2C_INT_STATUS_REG;
+ buf[6] = 0x00;
+ buf[7] = 0x00;
+ buf[8] = USB_END_I2C_CMD;
+
+ mxl111sf_i2c_get_data(state, 0, buf, buf);
+
+ if (0x08 == (buf[1] & 0x08))
+ status = 1;
+
+ if ((buf[5] & 0x02) == 0x02)
+ mxl_i2c("(buf[5] & 0x02) == 0x02"); /* FIXME */
+
+ return status;
+}
+
+static int mxl111sf_i2c_readagain(struct mxl111sf_state *state,
+ u8 count, u8 *rbuf)
+{
+ u8 i2c_w_data[26];
+ u8 i2c_r_data[24];
+ u8 i = 0;
+ u8 fifo_status = 0;
+ int status = 0;
+
+ mxl_i2c("read %d bytes", count);
+
+ while ((fifo_status == 0) && (i++ < 5))
+ fifo_status = mxl111sf_i2c_check_fifo(state);
+
+ i2c_w_data[0] = 0xDD;
+ i2c_w_data[1] = 0x00;
+
+ for (i = 2; i < 26; i++)
+ i2c_w_data[i] = 0xFE;
+
+ for (i = 0; i < count; i++) {
+ i2c_w_data[2+(i*3)] = 0x0C;
+ i2c_w_data[3+(i*3)] = 0x00;
+ i2c_w_data[4+(i*3)] = 0x00;
+ }
+
+ mxl111sf_i2c_get_data(state, 0, i2c_w_data, i2c_r_data);
+
+ /* Check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("error!");
+ } else {
+ for (i = 0; i < count; i++) {
+ rbuf[i] = i2c_r_data[(i*3)+1];
+ mxl_i2c("%02x\t %02x",
+ i2c_r_data[(i*3)+1],
+ i2c_r_data[(i*3)+2]);
+ }
+
+ status = 1;
+ }
+
+ return status;
+}
+
+#define HWI2C400 1
+static int mxl111sf_i2c_hw_xfer_msg(struct mxl111sf_state *state,
+ struct i2c_msg *msg)
+{
+ int i, k, ret = 0;
+ u16 index = 0;
+ u8 buf[26];
+ u8 i2c_r_data[24];
+ u16 block_len;
+ u16 left_over_len;
+ u8 rd_status[8];
+ u8 ret_status;
+ u8 readbuff[26];
+
+ mxl_i2c("addr: 0x%02x, read buff len: %d, write buff len: %d",
+ msg->addr, (msg->flags & I2C_M_RD) ? msg->len : 0,
+ (!(msg->flags & I2C_M_RD)) ? msg->len : 0);
+
+ for (index = 0; index < 26; index++)
+ buf[index] = USB_END_I2C_CMD;
+
+ /* command to indicate data payload is destined for I2C interface */
+ buf[0] = USB_WRITE_I2C_CMD;
+ buf[1] = 0x00;
+
+ /* enable I2C interface */
+ buf[2] = I2C_MUX_REG;
+ buf[3] = 0x80;
+ buf[4] = 0x00;
+
+ /* enable I2C interface */
+ buf[5] = I2C_MUX_REG;
+ buf[6] = 0x81;
+ buf[7] = 0x00;
+
+ /* set Timeout register on I2C interface */
+ buf[8] = 0x14;
+ buf[9] = 0xff;
+ buf[10] = 0x00;
+#if 0
+ /* enable Interrupts on I2C interface */
+ buf[8] = 0x24;
+ buf[9] = 0xF7;
+ buf[10] = 0x00;
+#endif
+ buf[11] = 0x24;
+ buf[12] = 0xF7;
+ buf[13] = 0x00;
+
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* write data on I2C bus */
+ if (!(msg->flags & I2C_M_RD) && (msg->len > 0)) {
+ mxl_i2c("%d\t%02x", msg->len, msg->buf[0]);
+
+ /* control register on I2C interface to initialize I2C bus */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x5E;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+ /* I2C Slave device Address */
+ buf[5] = I2C_SLAVE_ADDR_REG;
+ buf[6] = (msg->addr);
+ buf[7] = 0x00;
+ buf[8] = USB_END_I2C_CMD;
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* check for slave device status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK writing slave address %02x",
+ msg->addr);
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x4E;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ /* I2C interface can do I2C operations in block of 8 bytes of
+ I2C data. calculation to figure out number of blocks of i2c
+ data required to program */
+ block_len = (msg->len / 8);
+ left_over_len = (msg->len % 8);
+ index = 0;
+
+ mxl_i2c("block_len %d, left_over_len %d",
+ block_len, left_over_len);
+
+ for (index = 0; index < block_len; index++) {
+ for (i = 0; i < 8; i++) {
+ /* write data on I2C interface */
+ buf[2+(i*3)] = I2C_DATA_REG;
+ buf[3+(i*3)] = msg->buf[(index*8)+i];
+ buf[4+(i*3)] = 0x00;
+ }
+
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK writing slave address %02x",
+ msg->addr);
+
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x4E;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ }
+
+ if (left_over_len) {
+ for (k = 0; k < 26; k++)
+ buf[k] = USB_END_I2C_CMD;
+
+ buf[0] = 0x99;
+ buf[1] = 0x00;
+
+ for (i = 0; i < left_over_len; i++) {
+ buf[2+(i*3)] = I2C_DATA_REG;
+ buf[3+(i*3)] = msg->buf[(index*8)+i];
+ mxl_i2c("index = %d %d data %d",
+ index, i, msg->buf[(index*8)+i]);
+ buf[4+(i*3)] = 0x00;
+ }
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK writing slave address %02x",
+ msg->addr);
+
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x4E;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ }
+
+ /* issue I2C STOP after write */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x4E;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+ }
+
+ /* read data from I2C bus */
+ if ((msg->flags & I2C_M_RD) && (msg->len > 0)) {
+ mxl_i2c("read buf len %d", msg->len);
+
+ /* command to indicate data payload is
+ destined for I2C interface */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xDF;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+ /* I2C xfer length */
+ buf[5] = 0x14;
+ buf[6] = (msg->len & 0xFF);
+ buf[7] = 0;
+
+ /* I2C slave device Address */
+ buf[8] = I2C_SLAVE_ADDR_REG;
+ buf[9] = msg->addr;
+ buf[10] = 0x00;
+ buf[11] = USB_END_I2C_CMD;
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK reading slave address %02x",
+ msg->addr);
+
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xC7;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ /* I2C interface can do I2C operations in block of 8 bytes of
+ I2C data. calculation to figure out number of blocks of
+ i2c data required to program */
+ block_len = ((msg->len) / 8);
+ left_over_len = ((msg->len) % 8);
+ index = 0;
+
+ mxl_i2c("block_len %d, left_over_len %d",
+ block_len, left_over_len);
+
+ /* command to read data from I2C interface */
+ buf[0] = USB_READ_I2C_CMD;
+ buf[1] = 0x00;
+
+ for (index = 0; index < block_len; index++) {
+ /* setup I2C read request packet on I2C interface */
+ for (i = 0; i < 8; i++) {
+ buf[2+(i*3)] = I2C_DATA_REG;
+ buf[3+(i*3)] = 0x00;
+ buf[4+(i*3)] = 0x00;
+ }
+
+ ret = mxl111sf_i2c_get_data(state, 0, buf, i2c_r_data);
+
+ /* check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK reading slave address %02x",
+ msg->addr);
+
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xC7;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ /* copy data from i2c data payload to read buffer */
+ for (i = 0; i < 8; i++) {
+ rd_status[i] = i2c_r_data[(i*3)+2];
+
+ if (rd_status[i] == 0x04) {
+ if (i < 7) {
+ mxl_i2c("i2c fifo empty!"
+ " @ %d", i);
+ msg->buf[(index*8)+i] =
+ i2c_r_data[(i*3)+1];
+ /* read again */
+ ret_status =
+ mxl111sf_i2c_readagain(
+ state, 8-(i+1),
+ readbuff);
+ if (ret_status == 1) {
+ for (k = 0;
+ k < 8-(i+1);
+ k++) {
+
+ msg->buf[(index*8)+(k+i+1)] =
+ readbuff[k];
+ mxl_i2c("read data: %02x\t %02x",
+ msg->buf[(index*8)+(k+i)],
+ (index*8)+(k+i));
+ mxl_i2c("read data: %02x\t %02x",
+ msg->buf[(index*8)+(k+i+1)],
+ readbuff[k]);
+
+ }
+ goto stop_copy;
+ } else {
+ mxl_i2c("readagain "
+ "ERROR!");
+ }
+ } else {
+ msg->buf[(index*8)+i] =
+ i2c_r_data[(i*3)+1];
+ }
+ } else {
+ msg->buf[(index*8)+i] =
+ i2c_r_data[(i*3)+1];
+ }
+ }
+stop_copy:
+ ;
+
+ }
+
+ if (left_over_len) {
+ for (k = 0; k < 26; k++)
+ buf[k] = USB_END_I2C_CMD;
+
+ buf[0] = 0xDD;
+ buf[1] = 0x00;
+
+ for (i = 0; i < left_over_len; i++) {
+ buf[2+(i*3)] = I2C_DATA_REG;
+ buf[3+(i*3)] = 0x00;
+ buf[4+(i*3)] = 0x00;
+ }
+ ret = mxl111sf_i2c_get_data(state, 0, buf,
+ i2c_r_data);
+
+ /* check for I2C NACK status */
+ if (mxl111sf_i2c_check_status(state) == 1) {
+ mxl_i2c("NACK reading slave address %02x",
+ msg->addr);
+
+ /* if NACK, stop I2C bus and exit */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xC7;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+ ret = -EIO;
+ goto exit;
+ }
+
+ for (i = 0; i < left_over_len; i++) {
+ msg->buf[(block_len*8)+i] =
+ i2c_r_data[(i*3)+1];
+ mxl_i2c("read data: %02x\t %02x",
+ i2c_r_data[(i*3)+1],
+ i2c_r_data[(i*3)+2]);
+ }
+ }
+
+ /* indicate I2C interface to issue NACK
+ after next I2C read op */
+ buf[0] = USB_WRITE_I2C_CMD;
+ buf[1] = 0x00;
+
+ /* control register */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0x17;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+ buf[5] = USB_END_I2C_CMD;
+ ret = mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* control register */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xC7;
+ buf[4] = (HWI2C400) ? 0x03 : 0x0D;
+
+ }
+exit:
+ /* STOP and disable I2C MUX */
+ buf[0] = USB_WRITE_I2C_CMD;
+ buf[1] = 0x00;
+
+ /* de-initilize I2C BUS */
+ buf[5] = USB_END_I2C_CMD;
+ mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* Control Register */
+ buf[2] = I2C_CONTROL_REG;
+ buf[3] = 0xDF;
+ buf[4] = 0x03;
+
+ /* disable I2C interface */
+ buf[5] = I2C_MUX_REG;
+ buf[6] = 0x00;
+ buf[7] = 0x00;
+
+ /* de-initilize I2C BUS */
+ buf[8] = USB_END_I2C_CMD;
+ mxl111sf_i2c_send_data(state, 0, buf);
+
+ /* disable I2C interface */
+ buf[2] = I2C_MUX_REG;
+ buf[3] = 0x81;
+ buf[4] = 0x00;
+
+ /* disable I2C interface */
+ buf[5] = I2C_MUX_REG;
+ buf[6] = 0x00;
+ buf[7] = 0x00;
+
+ /* disable I2C interface */
+ buf[8] = I2C_MUX_REG;
+ buf[9] = 0x00;
+ buf[10] = 0x00;
+
+ buf[11] = USB_END_I2C_CMD;
+ mxl111sf_i2c_send_data(state, 0, buf);
+
+ return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+int mxl111sf_i2c_xfer(struct i2c_adapter *adap,
+ struct i2c_msg msg[], int num)
+{
+ struct dvb_usb_device *d = i2c_get_adapdata(adap);
+ struct mxl111sf_state *state = d->priv;
+ int hwi2c = (state->chip_rev > MXL111SF_V6);
+ int i, ret;
+
+ if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+ return -EAGAIN;
+
+ for (i = 0; i < num; i++) {
+ ret = (hwi2c) ?
+ mxl111sf_i2c_hw_xfer_msg(state, &msg[i]) :
+ mxl111sf_i2c_sw_xfer_msg(state, &msg[i]);
+ if (mxl_fail(ret)) {
+ mxl_debug_adv("failed with error %d on i2c "
+ "transaction %d of %d, %sing %d bytes "
+ "to/from 0x%02x", ret, i+1, num,
+ (msg[i].flags & I2C_M_RD) ?
+ "read" : "writ",
+ msg[i].len, msg[i].addr);
+
+ break;
+ }
+ }
+
+ mutex_unlock(&d->i2c_mutex);
+
+ return i == num ? num : -EREMOTEIO;
+}
Code Review / kvmfornfv.git / blobdiff