| /* |
| 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 >> 1; |
| |
| dprintk2(2, "%s %s addr=%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(" %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)) { |
| /* read bytes */ |
| rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap, |
| &msgs[i], |
| &msgs[i + 1]); |
| if (i2c_debug >= 2) { |
| for (byte = 0; byte < msgs[i].len; byte++) |
| printk(" %02x", msgs[i].buf[byte]); |
| } |
| i++; |
| } else { |
| /* write bytes */ |
| if (i2c_debug >= 2) { |
| for (byte = 0; byte < msgs[i].len; byte++) |
| printk(" %02x", msgs[i].buf[byte]); |
| } |
| rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]); |
| } |
| if (rc < 0) |
| goto err; |
| if (i2c_debug >= 2) |
| printk("\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; |
| } |