| /* |
| * Driver for the Conexant CX23885 PCIe bridge |
| * |
| * Copyright (c) 2006 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 <asm/io.h> |
| |
| #include "cx23885.h" |
| |
| #include <media/v4l2-common.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 cx23885_i2c *bus = i2c_adap->algo_data; |
| struct cx23885_dev *dev = bus->dev; |
| return cx_read(bus->reg_stat) & 0x01; |
| } |
| |
| static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) |
| { |
| struct cx23885_i2c *bus = i2c_adap->algo_data; |
| struct cx23885_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 cx23885_i2c *bus = i2c_adap->algo_data; |
| struct cx23885_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 -ENXIO; |
| |
| 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); |
| |
| if (!i2c_wait_done(i2c_adap)) |
| goto eio; |
| if (i2c_debug) { |
| printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]); |
| 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); |
| |
| if (!i2c_wait_done(i2c_adap)) |
| 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) |
| printk(KERN_ERR " ERR: %d\n", retval); |
| return retval; |
| } |
| |
| static int i2c_readbytes(struct i2c_adapter *i2c_adap, |
| const struct i2c_msg *msg, int joined) |
| { |
| struct cx23885_i2c *bus = i2c_adap->algo_data; |
| struct cx23885_dev *dev = bus->dev; |
| u32 ctrl, cnt; |
| int retval; |
| |
| |
| if (i2c_debug && !joined) |
| 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) | 1); |
| if (!i2c_wait_done(i2c_adap)) |
| return -EIO; |
| if (!i2c_slave_did_ack(i2c_adap)) |
| return -ENXIO; |
| |
| |
| 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); |
| |
| if (!i2c_wait_done(i2c_adap)) |
| 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) |
| printk(KERN_ERR " ERR: %d\n", retval); |
| return retval; |
| } |
| |
| static int i2c_xfer(struct i2c_adapter *i2c_adap, |
| struct i2c_msg *msgs, int num) |
| { |
| struct cx23885_i2c *bus = i2c_adap->algo_data; |
| struct cx23885_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 cx23885_functionality(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; |
| } |
| |
| static struct i2c_algorithm cx23885_i2c_algo_template = { |
| .master_xfer = i2c_xfer, |
| .functionality = cx23885_functionality, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static struct i2c_adapter cx23885_i2c_adap_template = { |
| .name = "cx23885", |
| .owner = THIS_MODULE, |
| .algo = &cx23885_i2c_algo_template, |
| }; |
| |
| static struct i2c_client cx23885_i2c_client_template = { |
| .name = "cx23885 internal", |
| }; |
| |
| static char *i2c_devs[128] = { |
| [0x10 >> 1] = "tda10048", |
| [0x12 >> 1] = "dib7000pc", |
| [0x1c >> 1] = "lgdt3303", |
| [0x86 >> 1] = "tda9887", |
| [0x32 >> 1] = "cx24227", |
| [0x88 >> 1] = "cx25837", |
| [0x84 >> 1] = "tda8295", |
| [0xa0 >> 1] = "eeprom", |
| [0xc0 >> 1] = "tuner/mt2131/tda8275", |
| [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028", |
| [0xc8 >> 1] = "tuner/xc3028L", |
| }; |
| |
| 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 algo-bit adapter */ |
| int cx23885_i2c_register(struct cx23885_i2c *bus) |
| { |
| struct cx23885_dev *dev = bus->dev; |
| |
| dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); |
| |
| memcpy(&bus->i2c_adap, &cx23885_i2c_adap_template, |
| sizeof(bus->i2c_adap)); |
| memcpy(&bus->i2c_algo, &cx23885_i2c_algo_template, |
| sizeof(bus->i2c_algo)); |
| memcpy(&bus->i2c_client, &cx23885_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; |
| |
| if (0 == bus->i2c_rc) { |
| dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr); |
| if (i2c_scan) { |
| printk(KERN_INFO "%s: scan bus %d:\n", |
| dev->name, bus->nr); |
| do_i2c_scan(dev->name, &bus->i2c_client); |
| } |
| } else |
| printk(KERN_WARNING "%s: i2c bus %d register FAILED\n", |
| dev->name, bus->nr); |
| |
| /* Instantiate the IR receiver device, if present */ |
| if (0 == bus->i2c_rc) { |
| struct i2c_board_info info; |
| const unsigned short addr_list[] = { |
| 0x6b, I2C_CLIENT_END |
| }; |
| |
| memset(&info, 0, sizeof(struct i2c_board_info)); |
| strlcpy(info.type, "ir_video", I2C_NAME_SIZE); |
| /* Use quick read command for probe, some IR chips don't |
| * support writes */ |
| i2c_new_probed_device(&bus->i2c_adap, &info, addr_list, |
| i2c_probe_func_quick_read); |
| } |
| |
| return bus->i2c_rc; |
| } |
| |
| int cx23885_i2c_unregister(struct cx23885_i2c *bus) |
| { |
| i2c_del_adapter(&bus->i2c_adap); |
| return 0; |
| } |
| |
| void cx23885_av_clk(struct cx23885_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[2].i2c_adap, &msg, 1); |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |