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598 lines
14 KiB
598 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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cx231xx-i2c.c - driver for Conexant Cx23100/101/102 USB video capture devices |
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Copyright (C) 2008 <srinivasa.deevi at conexant dot com> |
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Based on em28xx driver |
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Based on Cx23885 driver |
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*/ |
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#include "cx231xx.h" |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/i2c.h> |
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#include <linux/i2c-mux.h> |
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#include <media/v4l2-common.h> |
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#include <media/tuner.h> |
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/* ----------------------------------------------------------- */ |
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static unsigned int i2c_scan; |
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module_param(i2c_scan, int, 0444); |
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); |
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static unsigned int i2c_debug; |
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module_param(i2c_debug, int, 0644); |
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); |
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#define dprintk1(lvl, fmt, args...) \ |
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do { \ |
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if (i2c_debug >= lvl) { \ |
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printk(fmt, ##args); \ |
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} \ |
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} while (0) |
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#define dprintk2(lvl, fmt, args...) \ |
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do { \ |
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if (i2c_debug >= lvl) { \ |
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printk(KERN_DEBUG "%s at %s: " fmt, \ |
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dev->name, __func__ , ##args); \ |
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} \ |
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} while (0) |
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static inline int get_real_i2c_port(struct cx231xx *dev, int bus_nr) |
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{ |
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if (bus_nr == 1) |
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return dev->port_3_switch_enabled ? I2C_1_MUX_3 : I2C_1_MUX_1; |
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return bus_nr; |
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} |
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static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus, |
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const struct i2c_msg *msg, int tuner_type) |
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{ |
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int i2c_port = get_real_i2c_port(dev, bus->nr); |
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if (i2c_port != dev->board.tuner_i2c_master) |
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return false; |
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if (msg->addr != dev->board.tuner_addr) |
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return false; |
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if (dev->tuner_type != tuner_type) |
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return false; |
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return true; |
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} |
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/* |
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* cx231xx_i2c_send_bytes() |
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*/ |
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static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap, |
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const struct i2c_msg *msg) |
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{ |
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struct cx231xx_i2c *bus = i2c_adap->algo_data; |
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struct cx231xx *dev = bus->dev; |
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struct cx231xx_i2c_xfer_data req_data; |
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int status = 0; |
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u16 size = 0; |
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u8 loop = 0; |
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u8 saddr_len = 1; |
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u8 *buf_ptr = NULL; |
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u16 saddr = 0; |
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u8 need_gpio = 0; |
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if (is_tuner(dev, bus, msg, TUNER_XC5000)) { |
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size = msg->len; |
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if (size == 2) { /* register write sub addr */ |
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/* Just writing sub address will cause problem |
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* to XC5000. So ignore the request */ |
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return 0; |
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} else if (size == 4) { /* register write with sub addr */ |
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if (msg->len >= 2) |
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saddr = msg->buf[0] << 8 | msg->buf[1]; |
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else if (msg->len == 1) |
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saddr = msg->buf[0]; |
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switch (saddr) { |
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case 0x0000: /* start tuner calibration mode */ |
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need_gpio = 1; |
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/* FW Loading is done */ |
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dev->xc_fw_load_done = 1; |
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break; |
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case 0x000D: /* Set signal source */ |
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case 0x0001: /* Set TV standard - Video */ |
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case 0x0002: /* Set TV standard - Audio */ |
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case 0x0003: /* Set RF Frequency */ |
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need_gpio = 1; |
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break; |
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default: |
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if (dev->xc_fw_load_done) |
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need_gpio = 1; |
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break; |
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} |
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if (need_gpio) { |
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dprintk1(1, |
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"GPIO WRITE: addr 0x%x, len %d, saddr 0x%x\n", |
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msg->addr, msg->len, saddr); |
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return dev->cx231xx_gpio_i2c_write(dev, |
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msg->addr, |
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msg->buf, |
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msg->len); |
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} |
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} |
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/* special case for Xc5000 tuner case */ |
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saddr_len = 1; |
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/* adjust the length to correct length */ |
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size -= saddr_len; |
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buf_ptr = (u8 *) (msg->buf + 1); |
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do { |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg->addr; |
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req_data.direction = msg->flags; |
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req_data.saddr_len = saddr_len; |
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req_data.saddr_dat = msg->buf[0]; |
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req_data.buf_size = size > 16 ? 16 : size; |
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req_data.p_buffer = (u8 *) (buf_ptr + loop * 16); |
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bus->i2c_nostop = (size > 16) ? 1 : 0; |
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bus->i2c_reserve = (loop == 0) ? 0 : 1; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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loop++; |
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if (size >= 16) |
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size -= 16; |
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else |
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size = 0; |
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} while (size > 0); |
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bus->i2c_nostop = 0; |
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bus->i2c_reserve = 0; |
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} else { /* regular case */ |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg->addr; |
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req_data.direction = msg->flags; |
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req_data.saddr_len = 0; |
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req_data.saddr_dat = 0; |
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req_data.buf_size = msg->len; |
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req_data.p_buffer = msg->buf; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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} |
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return status < 0 ? status : 0; |
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} |
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/* |
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* cx231xx_i2c_recv_bytes() |
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* read a byte from the i2c device |
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*/ |
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static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap, |
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const struct i2c_msg *msg) |
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{ |
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struct cx231xx_i2c *bus = i2c_adap->algo_data; |
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struct cx231xx *dev = bus->dev; |
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struct cx231xx_i2c_xfer_data req_data; |
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int status = 0; |
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u16 saddr = 0; |
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u8 need_gpio = 0; |
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if (is_tuner(dev, bus, msg, TUNER_XC5000)) { |
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if (msg->len == 2) |
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saddr = msg->buf[0] << 8 | msg->buf[1]; |
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else if (msg->len == 1) |
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saddr = msg->buf[0]; |
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if (dev->xc_fw_load_done) { |
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switch (saddr) { |
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case 0x0009: /* BUSY check */ |
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dprintk1(1, |
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"GPIO R E A D: Special case BUSY check \n"); |
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/*Try read BUSY register, just set it to zero*/ |
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msg->buf[0] = 0; |
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if (msg->len == 2) |
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msg->buf[1] = 0; |
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return 0; |
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case 0x0004: /* read Lock status */ |
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need_gpio = 1; |
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break; |
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} |
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if (need_gpio) { |
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/* this is a special case to handle Xceive tuner |
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clock stretch issue with gpio based I2C */ |
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dprintk1(1, |
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"GPIO R E A D: addr 0x%x, len %d, saddr 0x%x\n", |
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msg->addr, msg->len, |
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msg->buf[0] << 8 | msg->buf[1]); |
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status = |
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dev->cx231xx_gpio_i2c_write(dev, msg->addr, |
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msg->buf, |
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msg->len); |
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status = |
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dev->cx231xx_gpio_i2c_read(dev, msg->addr, |
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msg->buf, |
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msg->len); |
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return status; |
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} |
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} |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg->addr; |
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req_data.direction = msg->flags; |
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req_data.saddr_len = msg->len; |
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req_data.saddr_dat = msg->buf[0] << 8 | msg->buf[1]; |
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req_data.buf_size = msg->len; |
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req_data.p_buffer = msg->buf; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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} else { |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg->addr; |
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req_data.direction = msg->flags; |
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req_data.saddr_len = 0; |
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req_data.saddr_dat = 0; |
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req_data.buf_size = msg->len; |
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req_data.p_buffer = msg->buf; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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} |
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return status < 0 ? status : 0; |
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} |
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/* |
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* cx231xx_i2c_recv_bytes_with_saddr() |
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* read a byte from the i2c device |
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*/ |
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static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap, |
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const struct i2c_msg *msg1, |
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const struct i2c_msg *msg2) |
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{ |
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struct cx231xx_i2c *bus = i2c_adap->algo_data; |
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struct cx231xx *dev = bus->dev; |
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struct cx231xx_i2c_xfer_data req_data; |
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int status = 0; |
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u16 saddr = 0; |
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u8 need_gpio = 0; |
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if (msg1->len == 2) |
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saddr = msg1->buf[0] << 8 | msg1->buf[1]; |
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else if (msg1->len == 1) |
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saddr = msg1->buf[0]; |
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if (is_tuner(dev, bus, msg2, TUNER_XC5000)) { |
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if ((msg2->len < 16)) { |
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dprintk1(1, |
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"i2c_read: addr 0x%x, len %d, saddr 0x%x, len %d\n", |
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msg2->addr, msg2->len, saddr, msg1->len); |
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switch (saddr) { |
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case 0x0008: /* read FW load status */ |
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need_gpio = 1; |
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break; |
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case 0x0004: /* read Lock status */ |
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need_gpio = 1; |
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break; |
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} |
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if (need_gpio) { |
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status = |
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dev->cx231xx_gpio_i2c_write(dev, msg1->addr, |
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msg1->buf, |
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msg1->len); |
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status = |
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dev->cx231xx_gpio_i2c_read(dev, msg2->addr, |
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msg2->buf, |
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msg2->len); |
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return status; |
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} |
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} |
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} |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg2->addr; |
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req_data.direction = msg2->flags; |
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req_data.saddr_len = msg1->len; |
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req_data.saddr_dat = saddr; |
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req_data.buf_size = msg2->len; |
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req_data.p_buffer = msg2->buf; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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return status < 0 ? status : 0; |
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} |
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/* |
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* cx231xx_i2c_check_for_device() |
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* check if there is a i2c_device at the supplied address |
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*/ |
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static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap, |
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const struct i2c_msg *msg) |
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{ |
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struct cx231xx_i2c *bus = i2c_adap->algo_data; |
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struct cx231xx *dev = bus->dev; |
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struct cx231xx_i2c_xfer_data req_data; |
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int status = 0; |
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u8 buf[1]; |
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/* prepare xfer_data struct */ |
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req_data.dev_addr = msg->addr; |
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req_data.direction = I2C_M_RD; |
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req_data.saddr_len = 0; |
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req_data.saddr_dat = 0; |
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req_data.buf_size = 1; |
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req_data.p_buffer = buf; |
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/* usb send command */ |
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status = dev->cx231xx_send_usb_command(bus, &req_data); |
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return status < 0 ? status : 0; |
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} |
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/* |
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* cx231xx_i2c_xfer() |
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* the main i2c transfer function |
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*/ |
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static int cx231xx_i2c_xfer(struct i2c_adapter *i2c_adap, |
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struct i2c_msg msgs[], int num) |
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{ |
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struct cx231xx_i2c *bus = i2c_adap->algo_data; |
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struct cx231xx *dev = bus->dev; |
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int addr, rc, i, byte; |
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mutex_lock(&dev->i2c_lock); |
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for (i = 0; i < num; i++) { |
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addr = msgs[i].addr; |
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dprintk2(2, "%s %s addr=0x%x len=%d:", |
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(msgs[i].flags & I2C_M_RD) ? "read" : "write", |
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i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len); |
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if (!msgs[i].len) { |
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/* no len: check only for device presence */ |
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rc = cx231xx_i2c_check_for_device(i2c_adap, &msgs[i]); |
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if (rc < 0) { |
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dprintk2(2, " no device\n"); |
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mutex_unlock(&dev->i2c_lock); |
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return rc; |
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} |
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} else if (msgs[i].flags & I2C_M_RD) { |
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/* read bytes */ |
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rc = cx231xx_i2c_recv_bytes(i2c_adap, &msgs[i]); |
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if (i2c_debug >= 2) { |
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for (byte = 0; byte < msgs[i].len; byte++) |
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printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
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} |
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} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && |
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msgs[i].addr == msgs[i + 1].addr |
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&& (msgs[i].len <= 2) && (bus->nr < 3)) { |
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/* write bytes */ |
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if (i2c_debug >= 2) { |
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for (byte = 0; byte < msgs[i].len; byte++) |
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printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
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printk(KERN_CONT "\n"); |
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} |
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/* read bytes */ |
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dprintk2(2, "plus %s %s addr=0x%x len=%d:", |
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(msgs[i+1].flags & I2C_M_RD) ? "read" : "write", |
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i+1 == num - 1 ? "stop" : "nonstop", addr, msgs[i+1].len); |
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rc = cx231xx_i2c_recv_bytes_with_saddr(i2c_adap, |
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&msgs[i], |
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&msgs[i + 1]); |
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if (i2c_debug >= 2) { |
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for (byte = 0; byte < msgs[i+1].len; byte++) |
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printk(KERN_CONT " %02x", msgs[i+1].buf[byte]); |
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} |
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i++; |
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} else { |
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/* write bytes */ |
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if (i2c_debug >= 2) { |
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for (byte = 0; byte < msgs[i].len; byte++) |
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printk(KERN_CONT " %02x", msgs[i].buf[byte]); |
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} |
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rc = cx231xx_i2c_send_bytes(i2c_adap, &msgs[i]); |
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} |
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if (rc < 0) |
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goto err; |
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if (i2c_debug >= 2) |
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printk(KERN_CONT "\n"); |
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} |
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mutex_unlock(&dev->i2c_lock); |
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return num; |
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err: |
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dprintk2(2, " ERROR: %i\n", rc); |
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mutex_unlock(&dev->i2c_lock); |
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return rc; |
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} |
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/* ----------------------------------------------------------- */ |
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/* |
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* functionality() |
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*/ |
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static u32 functionality(struct i2c_adapter *adap) |
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{ |
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; |
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} |
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static const struct i2c_algorithm cx231xx_algo = { |
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.master_xfer = cx231xx_i2c_xfer, |
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.functionality = functionality, |
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}; |
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static const struct i2c_adapter cx231xx_adap_template = { |
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.owner = THIS_MODULE, |
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.name = "cx231xx", |
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.algo = &cx231xx_algo, |
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}; |
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/* ----------------------------------------------------------- */ |
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/* |
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* i2c_devs |
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* incomplete list of known devices |
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*/ |
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static const char *i2c_devs[128] = { |
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[0x20 >> 1] = "demod", |
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[0x60 >> 1] = "colibri", |
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[0x88 >> 1] = "hammerhead", |
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[0x8e >> 1] = "CIR", |
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[0x32 >> 1] = "GeminiIII", |
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[0x02 >> 1] = "Aquarius", |
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[0xa0 >> 1] = "eeprom", |
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[0xc0 >> 1] = "tuner", |
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[0xc2 >> 1] = "tuner", |
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}; |
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/* |
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* cx231xx_do_i2c_scan() |
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* check i2c address range for devices |
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*/ |
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void cx231xx_do_i2c_scan(struct cx231xx *dev, int i2c_port) |
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{ |
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unsigned char buf; |
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int i, rc; |
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struct i2c_adapter *adap; |
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struct i2c_msg msg = { |
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.flags = I2C_M_RD, |
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.len = 1, |
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.buf = &buf, |
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}; |
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if (!i2c_scan) |
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return; |
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/* Don't generate I2C errors during scan */ |
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dev->i2c_scan_running = true; |
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adap = cx231xx_get_i2c_adap(dev, i2c_port); |
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for (i = 0; i < 128; i++) { |
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msg.addr = i; |
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rc = i2c_transfer(adap, &msg, 1); |
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if (rc < 0) |
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continue; |
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dev_info(dev->dev, |
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"i2c scan: found device @ port %d addr 0x%x [%s]\n", |
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i2c_port, |
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i << 1, |
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i2c_devs[i] ? i2c_devs[i] : "???"); |
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} |
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dev->i2c_scan_running = false; |
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} |
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/* |
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* cx231xx_i2c_register() |
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* register i2c bus |
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*/ |
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int cx231xx_i2c_register(struct cx231xx_i2c *bus) |
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{ |
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struct cx231xx *dev = bus->dev; |
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if (!dev->cx231xx_send_usb_command) |
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return -EINVAL; |
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bus->i2c_adap = cx231xx_adap_template; |
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bus->i2c_adap.dev.parent = dev->dev; |
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snprintf(bus->i2c_adap.name, sizeof(bus->i2c_adap.name), "%s-%d", bus->dev->name, bus->nr); |
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bus->i2c_adap.algo_data = bus; |
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i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); |
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bus->i2c_rc = i2c_add_adapter(&bus->i2c_adap); |
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if (0 != bus->i2c_rc) |
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dev_warn(dev->dev, |
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"i2c bus %d register FAILED\n", bus->nr); |
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return bus->i2c_rc; |
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} |
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|
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/* |
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* cx231xx_i2c_unregister() |
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* unregister i2c_bus |
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*/ |
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void cx231xx_i2c_unregister(struct cx231xx_i2c *bus) |
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{ |
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if (!bus->i2c_rc) |
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i2c_del_adapter(&bus->i2c_adap); |
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} |
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|
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/* |
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* cx231xx_i2c_mux_select() |
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* switch i2c master number 1 between port1 and port3 |
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*/ |
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static int cx231xx_i2c_mux_select(struct i2c_mux_core *muxc, u32 chan_id) |
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{ |
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struct cx231xx *dev = i2c_mux_priv(muxc); |
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return cx231xx_enable_i2c_port_3(dev, chan_id); |
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} |
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int cx231xx_i2c_mux_create(struct cx231xx *dev) |
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{ |
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dev->muxc = i2c_mux_alloc(&dev->i2c_bus[1].i2c_adap, dev->dev, 2, 0, 0, |
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cx231xx_i2c_mux_select, NULL); |
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if (!dev->muxc) |
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return -ENOMEM; |
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dev->muxc->priv = dev; |
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return 0; |
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} |
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|
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int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no) |
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{ |
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return i2c_mux_add_adapter(dev->muxc, |
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0, |
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mux_no /* chan_id */, |
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0 /* class */); |
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} |
|
|
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void cx231xx_i2c_mux_unregister(struct cx231xx *dev) |
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{ |
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i2c_mux_del_adapters(dev->muxc); |
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} |
|
|
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struct i2c_adapter *cx231xx_get_i2c_adap(struct cx231xx *dev, int i2c_port) |
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{ |
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switch (i2c_port) { |
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case I2C_0: |
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return &dev->i2c_bus[0].i2c_adap; |
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case I2C_1: |
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return &dev->i2c_bus[1].i2c_adap; |
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case I2C_2: |
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return &dev->i2c_bus[2].i2c_adap; |
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case I2C_1_MUX_1: |
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return dev->muxc->adapter[0]; |
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case I2C_1_MUX_3: |
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return dev->muxc->adapter[1]; |
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default: |
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BUG(); |
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} |
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} |
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EXPORT_SYMBOL_GPL(cx231xx_get_i2c_adap);
|
|
|