| /* |
| * Driver for the Conexant CX23885 PCIe bridge |
| * |
| * Copyright (c) 2006 Steven Toth <stoth@hauppauge.com> |
| * |
| * 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 = 0; |
| 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", __FUNCTION__, |
| msg->len, joined_rlen); |
| else |
| dprintk(1, "%s(msg->len=%d)\n", __FUNCTION__, 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", __FUNCTION__); |
| 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) { |
| 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); |
| |
| retval = i2c_wait_done(i2c_adap); |
| if (retval < 0) |
| goto err; |
| if (retval == 0) |
| goto eio; |
| if (i2c_debug) { |
| printk(" %02x", msg->buf[cnt]); |
| if (!(ctrl & I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| } |
| return msg->len; |
| |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| printk(" 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", __FUNCTION__, 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", __FUNCTION__); |
| return 0; |
| } |
| |
| if (i2c_debug) { |
| if (joined) |
| printk(" R"); |
| else |
| printk(" <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) { |
| printk(" %02x", msg->buf[cnt]); |
| if (!(ctrl & I2C_NOSTOP)) |
| printk(" >\n"); |
| } |
| } |
| return msg->len; |
| |
| eio: |
| retval = -EIO; |
| err: |
| if (i2c_debug) |
| printk(" 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", __FUNCTION__, num); |
| |
| for (i = 0 ; i < num; i++) { |
| dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n", |
| __FUNCTION__, 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 int attach_inform(struct i2c_client *client) |
| { |
| struct cx23885_i2c *bus = i2c_get_adapdata(client->adapter); |
| struct cx23885_dev *dev = bus->dev; |
| struct tuner_setup tun_setup; |
| |
| dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n", |
| client->driver->driver.name, client->addr, client->name); |
| |
| if (!client->driver->command) |
| return 0; |
| |
| if (dev->tuner_type != UNSET) { |
| |
| dprintk(1, "%s (tuner) i2c attach [addr=0x%x,client=%s]\n", |
| client->driver->driver.name, client->addr, |
| client->name); |
| |
| if ((dev->tuner_addr == ADDR_UNSET) || |
| (dev->tuner_addr == client->addr)) { |
| |
| dprintk(1, "%s (tuner || addr UNSET)\n", |
| client->driver->driver.name); |
| |
| dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n", |
| client->driver->driver.name, |
| client->addr, client->name); |
| |
| tun_setup.mode_mask = T_ANALOG_TV; |
| tun_setup.type = dev->tuner_type; |
| tun_setup.addr = dev->tuner_addr; |
| |
| client->driver->command(client, TUNER_SET_TYPE_ADDR, |
| &tun_setup); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int detach_inform(struct i2c_client *client) |
| { |
| struct cx23885_dev *dev = i2c_get_adapdata(client->adapter); |
| |
| dprintk(1, "i2c detach [client=%s]\n", client->name); |
| |
| return 0; |
| } |
| |
| void cx23885_call_i2c_clients(struct cx23885_i2c *bus, |
| unsigned int cmd, void *arg) |
| { |
| if (bus->i2c_rc != 0) |
| return; |
| |
| i2c_clients_command(&bus->i2c_adap, cmd, arg); |
| } |
| |
| 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, |
| .id = I2C_HW_B_CX23885, |
| .algo = &cx23885_i2c_algo_template, |
| .class = I2C_CLASS_TV_ANALOG, |
| .client_register = attach_inform, |
| .client_unregister = detach_inform, |
| }; |
| |
| static struct i2c_client cx23885_i2c_client_template = { |
| .name = "cx23885 internal", |
| }; |
| |
| static char *i2c_devs[128] = { |
| [ 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", |
| }; |
| |
| 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("%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", __FUNCTION__, 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, bus); |
| i2c_add_adapter(&bus->i2c_adap); |
| |
| bus->i2c_client.adapter = &bus->i2c_adap; |
| |
| if (0 == bus->i2c_rc) { |
| printk("%s: i2c bus %d registered\n", dev->name, bus->nr); |
| if (i2c_scan) |
| do_i2c_scan(dev->name, &bus->i2c_client); |
| } else |
| printk("%s: i2c bus %d register FAILED\n", dev->name, bus->nr); |
| |
| return bus->i2c_rc; |
| } |
| |
| int cx23885_i2c_unregister(struct cx23885_i2c *bus) |
| { |
| i2c_del_adapter(&bus->i2c_adap); |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |