| /* |
| * Driver for the Conexant CX25821 PCIe bridge |
| * |
| * Copyright (C) 2009 Conexant Systems Inc. |
| * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com> |
| * Based on Steven Toth <stoth@linuxtv.org> cx23885 driver |
| * |
| * 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. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include "cx25821.h" |
| #include <linux/i2c.h> |
| |
| static unsigned int i2c_debug; |
| module_param(i2c_debug, int, 0644); |
| MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); |
| |
| static unsigned int i2c_scan; |
| module_param(i2c_scan, int, 0444); |
| MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); |
| |
| #define dprintk(level, fmt, arg...) \ |
| do { \ |
| if (i2c_debug >= level) \ |
| printk(KERN_DEBUG "%s/0: " fmt, dev->name, ##arg); \ |
| } while (0) |
| |
| #define I2C_WAIT_DELAY 32 |
| #define I2C_WAIT_RETRY 64 |
| |
| #define I2C_EXTEND (1 << 3) |
| #define I2C_NOSTOP (1 << 4) |
| |
| static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap) |
| { |
| struct cx25821_i2c *bus = i2c_adap->algo_data; |
| struct cx25821_dev *dev = bus->dev; |
| return cx_read(bus->reg_stat) & 0x01; |
| } |
| |
| static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) |
| { |
| struct cx25821_i2c *bus = i2c_adap->algo_data; |
| struct cx25821_dev *dev = bus->dev; |
| return cx_read(bus->reg_stat) & 0x02 ? 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; |
| } |
| |
| static int i2c_sendbytes(struct i2c_adapter *i2c_adap, |
| const struct i2c_msg *msg, int joined_rlen) |
| { |
| struct cx25821_i2c *bus = i2c_adap->algo_data; |
| struct cx25821_dev *dev = bus->dev; |
| u32 wdata, addr, ctrl; |
| int retval, cnt; |
| |
| if (joined_rlen) |
| dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__, |
| msg->len, joined_rlen); |
| else |
| dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); |
| |
| /* Deal with i2c probe functions with zero payload */ |
| if (msg->len == 0) { |
| cx_write(bus->reg_addr, msg->addr << 25); |
| cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2)); |
| |
| if (!i2c_wait_done(i2c_adap)) |
| return -EIO; |
| |
| if (!i2c_slave_did_ack(i2c_adap)) |
| return -EIO; |
| |
| dprintk(1, "%s(): returns 0\n", __func__); |
| return 0; |
| } |
| |
| /* dev, reg + first byte */ |
| addr = (msg->addr << 25) | msg->buf[0]; |
| wdata = msg->buf[0]; |
| |
| ctrl = bus->i2c_period | (1 << 12) | (1 << 2); |
| |
| if (msg->len > 1) |
| ctrl |= I2C_NOSTOP | I2C_EXTEND; |
| else if (joined_rlen) |
| ctrl |= I2C_NOSTOP; |
| |
| cx_write(bus->reg_addr, addr); |
| cx_write(bus->reg_wdata, wdata); |
| cx_write(bus->reg_ctrl, ctrl); |
| |
| retval = i2c_wait_done(i2c_adap); |
| if (retval < 0) |
| goto err; |
| |
| if (retval == 0) |
| goto eio; |
| |
| if (i2c_debug) { |
| if (!(ctrl & I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| |
| for (cnt = 1; cnt < msg->len; cnt++) { |
| /* following bytes */ |
| wdata = msg->buf[cnt]; |
| ctrl = bus->i2c_period | (1 << 12) | (1 << 2); |
| |
| if (cnt < msg->len - 1) |
| ctrl |= I2C_NOSTOP | I2C_EXTEND; |
| else if (joined_rlen) |
| ctrl |= I2C_NOSTOP; |
| |
| cx_write(bus->reg_addr, addr); |
| cx_write(bus->reg_wdata, wdata); |
| cx_write(bus->reg_ctrl, ctrl); |
| |
| retval = i2c_wait_done(i2c_adap); |
| if (retval < 0) |
| goto err; |
| |
| if (retval == 0) |
| goto eio; |
| |
| if (i2c_debug) { |
| dprintk(1, " %02x", msg->buf[cnt]); |
| if (!(ctrl & I2C_NOSTOP)) |
| dprintk(1, " >\n"); |
| } |
| } |
| |
| return msg->len; |
| |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| pr_err(" ERR: %d\n", retval); |
| return retval; |
| } |
| |
| static int i2c_readbytes(struct i2c_adapter *i2c_adap, |
| const struct i2c_msg *msg, int joined) |
| { |
| struct cx25821_i2c *bus = i2c_adap->algo_data; |
| struct cx25821_dev *dev = bus->dev; |
| u32 ctrl, cnt; |
| int retval; |
| |
| if (i2c_debug && !joined) |
| dprintk(1, "6-%s(msg->len=%d)\n", __func__, msg->len); |
| |
| /* Deal with i2c probe functions with zero payload */ |
| if (msg->len == 0) { |
| cx_write(bus->reg_addr, msg->addr << 25); |
| cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1); |
| if (!i2c_wait_done(i2c_adap)) |
| return -EIO; |
| if (!i2c_slave_did_ack(i2c_adap)) |
| return -EIO; |
| |
| dprintk(1, "%s(): returns 0\n", __func__); |
| return 0; |
| } |
| |
| if (i2c_debug) { |
| if (joined) |
| dprintk(1, " R"); |
| else |
| dprintk(1, " <R %02x", (msg->addr << 1) + 1); |
| } |
| |
| for (cnt = 0; cnt < msg->len; cnt++) { |
| |
| ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1; |
| |
| if (cnt < msg->len - 1) |
| ctrl |= I2C_NOSTOP | I2C_EXTEND; |
| |
| cx_write(bus->reg_addr, msg->addr << 25); |
| cx_write(bus->reg_ctrl, ctrl); |
| |
| retval = i2c_wait_done(i2c_adap); |
| if (retval < 0) |
| goto err; |
| if (retval == 0) |
| goto eio; |
| msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff; |
| |
| if (i2c_debug) { |
| dprintk(1, " %02x", msg->buf[cnt]); |
| if (!(ctrl & I2C_NOSTOP)) |
| dprintk(1, " >\n"); |
| } |
| } |
| |
| return msg->len; |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| pr_err(" ERR: %d\n", retval); |
| return retval; |
| } |
| |
| static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) |
| { |
| struct cx25821_i2c *bus = i2c_adap->algo_data; |
| struct cx25821_dev *dev = bus->dev; |
| int i, retval = 0; |
| |
| dprintk(1, "%s(num = %d)\n", __func__, num); |
| |
| for (i = 0; i < num; i++) { |
| dprintk(1, "%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 cx25821_functionality(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C | I2C_FUNC_SMBUS_WORD_DATA | |
| I2C_FUNC_SMBUS_READ_WORD_DATA | I2C_FUNC_SMBUS_WRITE_WORD_DATA; |
| } |
| |
| static struct i2c_algorithm cx25821_i2c_algo_template = { |
| .master_xfer = i2c_xfer, |
| .functionality = cx25821_functionality, |
| #ifdef NEED_ALGO_CONTROL |
| .algo_control = dummy_algo_control, |
| #endif |
| }; |
| |
| static struct i2c_adapter cx25821_i2c_adap_template = { |
| .name = "cx25821", |
| .owner = THIS_MODULE, |
| .algo = &cx25821_i2c_algo_template, |
| }; |
| |
| static struct i2c_client cx25821_i2c_client_template = { |
| .name = "cx25821 internal", |
| }; |
| |
| /* init + register i2c adapter */ |
| int cx25821_i2c_register(struct cx25821_i2c *bus) |
| { |
| struct cx25821_dev *dev = bus->dev; |
| |
| dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); |
| |
| memcpy(&bus->i2c_adap, &cx25821_i2c_adap_template, |
| sizeof(bus->i2c_adap)); |
| memcpy(&bus->i2c_algo, &cx25821_i2c_algo_template, |
| sizeof(bus->i2c_algo)); |
| memcpy(&bus->i2c_client, &cx25821_i2c_client_template, |
| sizeof(bus->i2c_client)); |
| |
| bus->i2c_adap.dev.parent = &dev->pci->dev; |
| |
| strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name)); |
| |
| bus->i2c_algo.data = bus; |
| bus->i2c_adap.algo_data = bus; |
| i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); |
| i2c_add_adapter(&bus->i2c_adap); |
| |
| bus->i2c_client.adapter = &bus->i2c_adap; |
| |
| /* set up the I2c */ |
| bus->i2c_client.addr = (0x88 >> 1); |
| |
| return bus->i2c_rc; |
| } |
| |
| int cx25821_i2c_unregister(struct cx25821_i2c *bus) |
| { |
| i2c_del_adapter(&bus->i2c_adap); |
| return 0; |
| } |
| |
| void cx25821_av_clk(struct cx25821_dev *dev, int enable) |
| { |
| /* write 0 to bus 2 addr 0x144 via i2x_xfer() */ |
| char buffer[3]; |
| struct i2c_msg msg; |
| dprintk(1, "%s(enabled = %d)\n", __func__, enable); |
| |
| /* Register 0x144 */ |
| buffer[0] = 0x01; |
| buffer[1] = 0x44; |
| if (enable == 1) |
| buffer[2] = 0x05; |
| else |
| buffer[2] = 0x00; |
| |
| msg.addr = 0x44; |
| msg.flags = I2C_M_TEN; |
| msg.len = 3; |
| msg.buf = buffer; |
| |
| i2c_xfer(&dev->i2c_bus[0].i2c_adap, &msg, 1); |
| } |
| |
| int cx25821_i2c_read(struct cx25821_i2c *bus, u16 reg_addr, int *value) |
| { |
| struct i2c_client *client = &bus->i2c_client; |
| int retval = 0; |
| int v = 0; |
| u8 addr[2] = { 0, 0 }; |
| u8 buf[4] = { 0, 0, 0, 0 }; |
| |
| struct i2c_msg msgs[2] = { |
| { |
| .addr = client->addr, |
| .flags = 0, |
| .len = 2, |
| .buf = addr, |
| }, { |
| .addr = client->addr, |
| .flags = I2C_M_RD, |
| .len = 4, |
| .buf = buf, |
| } |
| }; |
| |
| addr[0] = (reg_addr >> 8); |
| addr[1] = (reg_addr & 0xff); |
| msgs[0].addr = 0x44; |
| msgs[1].addr = 0x44; |
| |
| retval = i2c_xfer(client->adapter, msgs, 2); |
| |
| v = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0]; |
| *value = v; |
| |
| return v; |
| } |
| |
| int cx25821_i2c_write(struct cx25821_i2c *bus, u16 reg_addr, int value) |
| { |
| struct i2c_client *client = &bus->i2c_client; |
| int retval = 0; |
| u8 buf[6] = { 0, 0, 0, 0, 0, 0 }; |
| |
| struct i2c_msg msgs[1] = { |
| { |
| .addr = client->addr, |
| .flags = 0, |
| .len = 6, |
| .buf = buf, |
| } |
| }; |
| |
| buf[0] = reg_addr >> 8; |
| buf[1] = reg_addr & 0xff; |
| buf[5] = (value >> 24) & 0xff; |
| buf[4] = (value >> 16) & 0xff; |
| buf[3] = (value >> 8) & 0xff; |
| buf[2] = value & 0xff; |
| client->flags = 0; |
| msgs[0].addr = 0x44; |
| |
| retval = i2c_xfer(client->adapter, msgs, 1); |
| |
| return retval; |
| } |