/* cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices Copyright (C) 2008 <srinivasa.deevi at conexant dot com> Based on em28xx driver Based on 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. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/usb.h> #include <linux/i2c.h> #include <media/v4l2-common.h> #include <media/tuner.h> #include "cx231xx.h" /* ----------------------------------------------------------- */ static unsigned int i2c_scan; module_param(i2c_scan, int, 0444); MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); static unsigned int i2c_debug; module_param(i2c_debug, int, 0644); MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); #define dprintk1(lvl, fmt, args...) \ do { \ if (i2c_debug >= lvl) { \ printk(fmt, ##args); \ } \ } while (0) #define dprintk2(lvl, fmt, args...) \ do { \ if (i2c_debug >= lvl) { \ printk(KERN_DEBUG "%s at %s: " fmt, \ dev->name, __func__ , ##args); \ } \ } while (0) static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus, const struct i2c_msg *msg, int tuner_type) { if (bus->nr != dev->board.tuner_i2c_master) return false; if (msg->addr != dev->board.tuner_addr) return false; if (dev->tuner_type != tuner_type) return false; return true; } /* * cx231xx_i2c_send_bytes() */ static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg) { struct cx231xx_i2c *bus = i2c_adap->algo_data; struct cx231xx *dev = bus->dev; struct cx231xx_i2c_xfer_data req_data; int status = 0; u16 size = 0; u8 loop = 0; u8 saddr_len = 1; u8 *buf_ptr = NULL; u16 saddr = 0; u8 need_gpio = 0; if (is_tuner(dev, bus, msg, TUNER_XC5000)) { size = msg->len; if (size == 2) { /* register write sub addr */ /* Just writing sub address will cause problem * to XC5000. So ignore the request */ return 0; } else if (size == 4) { /* register write with sub addr */ if (msg->len >= 2) saddr = msg->buf[0] << 8 | msg->buf[1]; else if (msg->len == 1) saddr = msg->buf[0]; switch (saddr) { case 0x0000: /* start tuner calibration mode */ need_gpio = 1; /* FW Loading is done */ dev->xc_fw_load_done = 1; break; case 0x000D: /* Set signal source */ case 0x0001: /* Set TV standard - Video */ case 0x0002: /* Set TV standard - Audio */ case 0x0003: /* Set RF Frequency */ need_gpio = 1; break; default: if (dev->xc_fw_load_done) need_gpio = 1; break; } if (need_gpio) { dprintk1(1, "GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n", msg->addr, msg->len, saddr); return dev->cx231xx_gpio_i2c_write(dev, msg->addr, msg->buf, msg->len); } } /* special case for Xc5000 tuner case */ saddr_len = 1; /* adjust the length to correct length */ size -= saddr_len; buf_ptr = (u8 *) (msg->buf + 1); do { /* prepare xfer_data struct */ req_data.dev_addr = msg->addr; req_data.direction = msg->flags; req_data.saddr_len = saddr_len; req_data.saddr_dat = msg->buf[0]; req_data.buf_size = size > 16 ? 16 : size; req_data.p_buffer = (u8 *) (buf_ptr + loop * 16); bus->i2c_nostop = (size > 16) ? 1 : 0; bus->i2c_reserve = (loop == 0) ? 0 : 1; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); loop++; if (size >= 16) size -= 16; else size = 0; } while (size > 0); bus->i2c_nostop = 0; bus->i2c_reserve = 0; } else { /* regular case */ /* prepare xfer_data struct */ req_data.dev_addr = msg->addr; req_data.direction = msg->flags; req_data.saddr_len = 0; req_data.saddr_dat = 0; req_data.buf_size = msg->len; req_data.p_buffer = msg->buf; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); } return status < 0 ? status : 0; } /* * cx231xx_i2c_recv_bytes() * read a byte from the i2c device */ static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg) { struct cx231xx_i2c *bus = i2c_adap->algo_data; struct cx231xx *dev = bus->dev; struct cx231xx_i2c_xfer_data req_data; int status = 0; u16 saddr = 0; u8 need_gpio = 0; if (is_tuner(dev, bus, msg, TUNER_XC5000)) { if (msg->len == 2) saddr = msg->buf[0] << 8 | msg->buf[1]; else if (msg->len == 1) saddr = msg->buf[0]; if (dev->xc_fw_load_done) { switch (saddr) { case 0x0009: /* BUSY check */ dprintk1(1, "GPIO R E A D: Special case BUSY check \n"); /*Try read BUSY register, just set it to zero*/ msg->buf[0] = 0; if (msg->len == 2) msg->buf[1] = 0; return 0; case 0x0004: /* read Lock status */ need_gpio = 1; break; } if (need_gpio) { /* this is a special case to handle Xceive tuner clock stretch issue with gpio based I2C */ dprintk1(1, "GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n", msg->addr, msg->len, msg->buf[0] << 8 | msg->buf[1]); status = dev->cx231xx_gpio_i2c_write(dev, msg->addr, msg->buf, msg->len); status = dev->cx231xx_gpio_i2c_read(dev, msg->addr, msg->buf, msg->len); return status; } } /* prepare xfer_data struct */ req_data.dev_addr = msg->addr; req_data.direction = msg->flags; req_data.saddr_len = msg->len; req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1]; req_data.buf_size = msg->len; req_data.p_buffer = msg->buf; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); } else { /* prepare xfer_data struct */ req_data.dev_addr = msg->addr; req_data.direction = msg->flags; req_data.saddr_len = 0; req_data.saddr_dat = 0; req_data.buf_size = msg->len; req_data.p_buffer = msg->buf; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); } return status < 0 ? status : 0; } /* * cx231xx_i2c_recv_bytes_with_saddr() * read a byte from the i2c device */ static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg1, const struct i2c_msg *msg2) { struct cx231xx_i2c *bus = i2c_adap->algo_data; struct cx231xx *dev = bus->dev; struct cx231xx_i2c_xfer_data req_data; int status = 0; u16 saddr = 0; u8 need_gpio = 0; if (msg1->len == 2) saddr = msg1->buf[0] << 8 | msg1->buf[1]; else if (msg1->len == 1) saddr = msg1->buf[0]; if (is_tuner(dev, bus, msg2, TUNER_XC5000)) { if ((msg2->len < 16)) { dprintk1(1, "i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n", msg2->addr, msg2->len, saddr, msg1->len); switch (saddr) { case 0x0008: /* read FW load status */ need_gpio = 1; break; case 0x0004: /* read Lock status */ need_gpio = 1; break; } if (need_gpio) { status = dev->cx231xx_gpio_i2c_write(dev, msg1->addr, msg1->buf, msg1->len); status = dev->cx231xx_gpio_i2c_read(dev, msg2->addr, msg2->buf, msg2->len); return status; } } } /* prepare xfer_data struct */ req_data.dev_addr = msg2->addr; req_data.direction = msg2->flags; req_data.saddr_len = msg1->len; req_data.saddr_dat = saddr; req_data.buf_size = msg2->len; req_data.p_buffer = msg2->buf; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); return status < 0 ? status : 0; } /* * cx231xx_i2c_check_for_device() * check if there is a i2c_device at the supplied address */ static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg) { struct cx231xx_i2c *bus = i2c_adap->algo_data; struct cx231xx *dev = bus->dev; struct cx231xx_i2c_xfer_data req_data; int status = 0; /* prepare xfer_data struct */ req_data.dev_addr = msg->addr; req_data.direction = msg->flags; req_data.saddr_len = 0; req_data.saddr_dat = 0; req_data.buf_size = 0; req_data.p_buffer = NULL; /* usb send command */ status = dev->cx231xx_send_usb_command(bus, &req_data); return status < 0 ? status : 0; } /* * cx231xx_i2c_xfer() * the main i2c transfer function */ static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) { struct cx231xx_i2c *bus = i2c_adap->algo_data; struct cx231xx *dev = bus->dev; int addr, rc, i, byte; if (num <= 0) return 0; mutex_lock(&dev->i2c_lock); for (i = 0; i < num; i++) { addr = msgs[i].addr; dprintk2(2, "%s %s addr=0x%x len=%d:", (msgs[i].flags & I2C_M_RD) ? "read" : "write", i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len); if (!msgs[i].len) { /* no len: check only for device presence */ rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]); if (rc < 0) { dprintk2(2, " no device\n"); mutex_unlock(&dev->i2c_lock); return rc; } } else if (msgs[i].flags & I2C_M_RD) { /* read bytes */ rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]); if (i2c_debug >= 2) { for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); } } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && msgs[i].addr == msgs[i + 1].addr && (msgs[i].len <= 2) && (bus->nr < 3)) { /* write bytes */ if (i2c_debug >= 2) { for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); printk(KERN_CONT "\n"); } /* read bytes */ dprintk2(2, "plus %s %s addr=0x%x len=%d:", (msgs[i+1].flags & I2C_M_RD) ? "read" : "write", i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len); rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap, &msgs[i], &msgs[i + 1]); if (i2c_debug >= 2) { for (byte = 0; byte < msgs[i+1].len; byte++) printk(KERN_CONT " %02x", msgs[i+1].buf[byte]); } i++; } else { /* write bytes */ if (i2c_debug >= 2) { for (byte = 0; byte < msgs[i].len; byte++) printk(KERN_CONT " %02x", msgs[i].buf[byte]); } rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]); } if (rc < 0) goto err; if (i2c_debug >= 2) printk(KERN_CONT "\n"); } mutex_unlock(&dev->i2c_lock); return num; err: dprintk2(2, " ERROR: %i\n", rc); mutex_unlock(&dev->i2c_lock); return rc; } /* ----------------------------------------------------------- */ /* * functionality() */ static u32 functionality(struct i2c_adapter *adap) { return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; } static struct i2c_algorithm cx231xx_algo = { .master_xfer = cx231xx_i2c_xfer, .functionality = functionality, }; static struct i2c_adapter cx231xx_adap_template = { .owner = THIS_MODULE, .name = "cx231xx", .algo = &cx231xx_algo, }; static struct i2c_client cx231xx_client_template = { .name = "cx231xx internal", }; /* ----------------------------------------------------------- */ /* * i2c_devs * incomplete list of known devices */ static char *i2c_devs[128] = { [0x60 >> 1] = "colibri", [0x88 >> 1] = "hammerhead", [0x8e >> 1] = "CIR", [0x32 >> 1] = "GeminiIII", [0x02 >> 1] = "Aquarius", [0xa0 >> 1] = "eeprom", [0xc0 >> 1] = "tuner", [0xc2 >> 1] = "tuner", }; /* * cx231xx_do_i2c_scan() * check i2c address range for devices */ void cx231xx_do_i2c_scan(struct cx231xx *dev, struct i2c_client *c) { unsigned char buf; int i, rc; cx231xx_info(": Checking for I2C devices ..\n"); for (i = 0; i < 128; i++) { c->addr = i; rc = i2c_master_recv(c, &buf, 0); if (rc < 0) continue; cx231xx_info("%s: i2c scan: found device @ 0x%x [%s]\n", dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); } cx231xx_info(": Completed Checking for I2C devices.\n"); } /* * cx231xx_i2c_register() * register i2c bus */ int cx231xx_i2c_register(struct cx231xx_i2c *bus) { struct cx231xx *dev = bus->dev; BUG_ON(!dev->cx231xx_send_usb_command); bus->i2c_adap = cx231xx_adap_template; bus->i2c_client = cx231xx_client_template; bus->i2c_adap.dev.parent = &dev->udev->dev; strlcpy(bus->i2c_adap.name, bus->dev->name, sizeof(bus->i2c_adap.name)); 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) { if (i2c_scan) cx231xx_do_i2c_scan(dev, &bus->i2c_client); } else cx231xx_warn("%s: i2c bus %d register FAILED\n", dev->name, bus->nr); return bus->i2c_rc; } /* * cx231xx_i2c_unregister() * unregister i2c_bus */ int cx231xx_i2c_unregister(struct cx231xx_i2c *bus) { i2c_del_adapter(&bus->i2c_adap); return 0; }