// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the Conexant CX23885 PCIe bridge * * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org> */ #include "cx23885.h" #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <asm/io.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 pr_fmt("%s: i2c:" fmt), \ __func__, ##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(KERN_DEBUG " <W %02x %02x", msg->addr << 1, msg->buf[0]); if (!(ctrl & I2C_NOSTOP)) pr_cont(" >\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) { pr_cont(" %02x", msg->buf[cnt]); if (!(ctrl & I2C_NOSTOP)) pr_cont(" >\n"); } } return msg->len; eio: retval = -EIO; if (i2c_debug) pr_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; if (i2c_debug) pr_err(" ERR: %d\n", retval); return retval; } static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) { 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 const struct i2c_algorithm cx23885_i2c_algo_template = { .master_xfer = i2c_xfer, .functionality = cx23885_functionality, }; /* ----------------------------------------------------------------------- */ static const struct i2c_adapter cx23885_i2c_adap_template = { .name = "cx23885", .owner = THIS_MODULE, .algo = &cx23885_i2c_algo_template, }; static const struct i2c_client cx23885_i2c_client_template = { .name = "cx23885 internal", }; static char *i2c_devs[128] = { [0x10 >> 1] = "tda10048", [0x12 >> 1] = "dib7000pc", [0x1c >> 1] = "lgdt3303", [0x80 >> 1] = "cs3308", [0x82 >> 1] = "cs3308", [0x86 >> 1] = "tda9887", [0x32 >> 1] = "cx24227", [0x88 >> 1] = "cx25837", [0x84 >> 1] = "tda8295", [0x98 >> 1] = "flatiron", [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; pr_info("%s: i2c scan: found device @ 0x%04x [%s]\n", name, i, i2c_devs[i] ? i2c_devs[i] : "???"); } } /* init + register i2c adapter */ int cx23885_i2c_register(struct cx23885_i2c *bus) { struct cx23885_dev *dev = bus->dev; dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); bus->i2c_adap = cx23885_i2c_adap_template; bus->i2c_client = cx23885_i2c_client_template; bus->i2c_adap.dev.parent = &dev->pci->dev; strscpy(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) { dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr); if (i2c_scan) { pr_info("%s: scan bus %d:\n", dev->name, bus->nr); do_i2c_scan(dev->name, &bus->i2c_client); } } else pr_warn("%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; static const unsigned short addr_list[] = { 0x6b, I2C_CLIENT_END }; memset(&info, 0, sizeof(struct i2c_board_info)); strscpy(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); }