/* em2820-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices Copyright (C) 2005 Markus Rechberger Ludovico Cavedon Mauro Carvalho Chehab Based on the em2800 driver from Sascha Sommer 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 #include #include #include #include #include #include "em2820.h" /* ----------------------------------------------------------- */ static unsigned int i2c_scan = 0; module_param(i2c_scan, int, 0444); MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); static unsigned int i2c_debug = 0; module_param(i2c_debug, int, 0644); MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); #define dprintk(fmt, args...) if (i2c_debug) do {\ printk(KERN_DEBUG "%s: %s: " fmt "\n",\ dev->name, __FUNCTION__ , ##args); } while (0) #define dprintk1(fmt, args...) if (i2c_debug) do{ \ printk(KERN_DEBUG "%s: %s: " fmt, \ dev->name, __FUNCTION__ , ##args); } while (0) #define dprintk2(fmt, args...) if (i2c_debug) do {\ printk(fmt , ##args); } while (0) /* * em2800_i2c_send_max4() * send up to 4 bytes to the i2c device */ static int em2800_i2c_send_max4(struct em2820 *dev, unsigned char addr, char *buf, int len) { int ret; int write_timeout; unsigned char b2[6]; BUG_ON(len < 1 || len > 4); b2[5] = 0x80 + len - 1; b2[4] = addr; b2[3] = buf[0]; if (len > 1) b2[2] = buf[1]; if (len > 2) b2[1] = buf[2]; if (len > 3) b2[0] = buf[3]; ret = dev->em2820_write_regs(dev, 4 - len, &b2[4 - len], 2 + len); if (ret != 2 + len) { em2820_warn("writting to i2c device failed (error=%i)\n", ret); return -EIO; } for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0; write_timeout -= 5) { ret = dev->em2820_read_reg(dev, 0x05); if (ret == 0x80 + len - 1) return len; mdelay(5); } em2820_warn("i2c write timed out\n"); return -EIO; } /* * em2800_i2c_send_bytes() */ static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf, short len) { char *bufPtr = buf; int ret; int wrcount = 0; int count; int maxLen = 4; struct em2820 *dev = (struct em2820 *)data; while (len > 0) { count = (len > maxLen) ? maxLen : len; ret = em2800_i2c_send_max4(dev, addr, bufPtr, count); if (ret > 0) { len -= count; bufPtr += count; wrcount += count; } else return (ret < 0) ? ret : -EFAULT; } return wrcount; } /* * em2800_i2c_check_for_device() * check if there is a i2c_device at the supplied address */ static int em2800_i2c_check_for_device(struct em2820 *dev, unsigned char addr) { char msg; int ret; int write_timeout; msg = addr; ret = dev->em2820_write_regs(dev, 0x04, &msg, 1); if (ret < 0) { em2820_warn("setting i2c device address failed (error=%i)\n", ret); return ret; } msg = 0x84; ret = dev->em2820_write_regs(dev, 0x05, &msg, 1); if (ret < 0) { em2820_warn("preparing i2c read failed (error=%i)\n", ret); return ret; } for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0; write_timeout -= 5) { unsigned msg = dev->em2820_read_reg(dev, 0x5); if (msg == 0x94) return -ENODEV; else if (msg == 0x84) return 0; mdelay(5); } return -ENODEV; } /* * em2800_i2c_recv_bytes() * read from the i2c device */ static int em2800_i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf, int len) { int ret; /* check for the device and set i2c read address */ ret = em2800_i2c_check_for_device(dev, addr); if (ret) { em2820_warn ("preparing read at i2c address 0x%x failed (error=%i)\n", addr, ret); return ret; } ret = dev->em2820_read_reg_req_len(dev, 0x0, 0x3, buf, len); if (ret < 0) { em2820_warn("reading from i2c device at 0x%x failed (error=%i)", addr, ret); return ret; } return ret; } /* * em2820_i2c_send_bytes() * untested for more than 4 bytes */ static int em2820_i2c_send_bytes(void *data, unsigned char addr, char *buf, short len, int stop) { int wrcount = 0; struct em2820 *dev = (struct em2820 *)data; wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len); return wrcount; } /* * em2820_i2c_recv_bytes() * read a byte from the i2c device */ static int em2820_i2c_recv_bytes(struct em2820 *dev, unsigned char addr, char *buf, int len) { int ret; ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len); if (ret < 0) { em2820_warn("reading i2c device failed (error=%i)\n", ret); return ret; } if (dev->em2820_read_reg(dev, 0x5) != 0) return -ENODEV; return ret; } /* * em2820_i2c_check_for_device() * check if there is a i2c_device at the supplied address */ static int em2820_i2c_check_for_device(struct em2820 *dev, unsigned char addr) { char msg; int ret; msg = addr; ret = dev->em2820_read_reg_req(dev, 2, addr); if (ret < 0) { em2820_warn("reading from i2c device failed (error=%i)\n", ret); return ret; } if (dev->em2820_read_reg(dev, 0x5) != 0) return -ENODEV; return 0; } /* * em2820_i2c_xfer() * the main i2c transfer function */ static int em2820_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num) { struct em2820 *dev = i2c_adap->algo_data; int addr, rc, i, byte; if (num <= 0) return 0; for (i = 0; i < num; i++) { addr = msgs[i].addr << 1; dprintk1("%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 */ if (dev->is_em2800) rc = em2800_i2c_check_for_device(dev, addr); else rc = em2820_i2c_check_for_device(dev, addr); if (rc < 0) { dprintk2(" no device\n"); return rc; } } else if (msgs[i].flags & I2C_M_RD) { /* read bytes */ if (dev->is_em2800) rc = em2800_i2c_recv_bytes(dev, addr, msgs[i].buf, msgs[i].len); else rc = em2820_i2c_recv_bytes(dev, addr, msgs[i].buf, msgs[i].len); if (i2c_debug) { for (byte = 0; byte < msgs[i].len; byte++) { printk(" %02x", msgs[i].buf[byte]); } } } else { /* write bytes */ if (i2c_debug) { for (byte = 0; byte < msgs[i].len; byte++) printk(" %02x", msgs[i].buf[byte]); } if (dev->is_em2800) rc = em2800_i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len); else rc = em2820_i2c_send_bytes(dev, addr, msgs[i].buf, msgs[i].len, i == num - 1); if (rc < 0) goto err; } if (i2c_debug) printk("\n"); } return num; err: dprintk2(" ERROR: %i\n", rc); return rc; } static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len) { unsigned char buf, *p = eedata; struct em2820_eeprom *em_eeprom = (void *)eedata; int i, err, size = len, block; dev->i2c_client.addr = 0xa0 >> 1; /* Check if board has eeprom */ err = i2c_master_recv(&dev->i2c_client, &buf, 0); if (err < 0) return -1; buf = 0; if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) { printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", dev->name, err); return -1; } while (size > 0) { if (size > 16) block = 16; else block = size; if (block != (err = i2c_master_recv(&dev->i2c_client, p, block))) { printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n", dev->name, err); return -1; } size -= block; p += block; } for (i = 0; i < len; i++) { if (0 == (i % 16)) printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i); printk(" %02x", eedata[i]); if (15 == (i % 16)) printk("\n"); } printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id); printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID, em_eeprom->product_ID); switch (em_eeprom->chip_conf >> 4 & 0x3) { case 0: printk(KERN_INFO "No audio on board.\n"); break; case 1: printk(KERN_INFO "AC97 audio (5 sample rates)\n"); break; case 2: printk(KERN_INFO "I2S audio, sample rate=32k\n"); break; case 3: printk(KERN_INFO "I2S audio, 3 sample rates\n"); break; } if (em_eeprom->chip_conf & 1 << 3) printk(KERN_INFO "USB Remote wakeup capable\n"); if (em_eeprom->chip_conf & 1 << 2) printk(KERN_INFO "USB Self power capable\n"); switch (em_eeprom->chip_conf & 0x3) { case 0: printk(KERN_INFO "500mA max power\n"); break; case 1: printk(KERN_INFO "400mA max power\n"); break; case 2: printk(KERN_INFO "300mA max power\n"); break; case 3: printk(KERN_INFO "200mA max power\n"); break; } return 0; } /* ----------------------------------------------------------- */ /* * algo_control() */ static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg) { return 0; } /* * functionality() */ static u32 functionality(struct i2c_adapter *adap) { return I2C_FUNC_SMBUS_EMUL; } #ifndef I2C_PEC static void inc_use(struct i2c_adapter *adap) { MOD_INC_USE_COUNT; } static void dec_use(struct i2c_adapter *adap) { MOD_DEC_USE_COUNT; } #endif static int em2820_set_tuner(int check_eeprom, struct i2c_client *client) { struct em2820 *dev = client->adapter->algo_data; struct tuner_setup tun_setup; if (dev->has_tuner) { tun_setup.mode_mask = T_ANALOG_TV | T_RADIO; tun_setup.type = dev->tuner_type; tun_setup.addr = dev->tuner_addr; em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup); } return (0); } /* * attach_inform() * gets called when a device attaches to the i2c bus * does some basic configuration */ static int attach_inform(struct i2c_client *client) { struct em2820 *dev = client->adapter->algo_data; dprintk("address %x", client->addr << 1); switch (client->addr << 1) { case 0x86: em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf); break; case 0x4a: dprintk1("attach_inform: saa7113 detected.\n"); break; case 0xa0: dprintk1("attach_inform: eeprom detected.\n"); break; case 0x80: case 0x88: dprintk1("attach_inform: msp34xx detected.\n"); break; case 0xb8: case 0xba: dprintk1("attach_inform: tvp5150 detected.\n"); break; default: dev->tuner_addr = client->addr; em2820_set_tuner(-1, client); } return 0; } static struct i2c_algorithm em2820_algo = { .master_xfer = em2820_i2c_xfer, .algo_control = algo_control, .functionality = functionality, }; static struct i2c_adapter em2820_adap_template = { #ifdef I2C_PEC .owner = THIS_MODULE, #else .inc_use = inc_use, .dec_use = dec_use, #endif #ifdef I2C_CLASS_TV_ANALOG .class = I2C_CLASS_TV_ANALOG, #endif .name = "em2820", .id = I2C_HW_B_EM2820, .algo = &em2820_algo, .client_register = attach_inform, }; static struct i2c_client em2820_client_template = { .name = "em2820 internal", .flags = I2C_CLIENT_ALLOW_USE, }; /* ----------------------------------------------------------- */ /* * i2c_devs * incomplete list of known devices */ static char *i2c_devs[128] = { [0x4a >> 1] = "saa7113h", [0x60 >> 1] = "remote IR sensor", [0x8e >> 1] = "remote IR sensor", [0x86 >> 1] = "tda9887", [0x80 >> 1] = "msp34xx", [0x88 >> 1] = "msp34xx", [0xa0 >> 1] = "eeprom", [0xb8 >> 1] = "tvp5150a", [0xba >> 1] = "tvp5150a", [0xc0 >> 1] = "tuner (analog)", [0xc2 >> 1] = "tuner (analog)", [0xc4 >> 1] = "tuner (analog)", [0xc6 >> 1] = "tuner (analog)", }; /* * do_i2c_scan() * check i2c address range for devices */ 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(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); } } /* * em2820_i2c_call_clients() * send commands to all attached i2c devices */ void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg) { BUG_ON(NULL == dev->i2c_adap.algo_data); i2c_clients_command(&dev->i2c_adap, cmd, arg); } /* * em2820_i2c_register() * register i2c bus */ int em2820_i2c_register(struct em2820 *dev) { BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg); BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req); dev->i2c_adap = em2820_adap_template; dev->i2c_adap.dev.parent = &dev->udev->dev; strcpy(dev->i2c_adap.name, dev->name); dev->i2c_adap.algo_data = dev; i2c_add_adapter(&dev->i2c_adap); dev->i2c_client = em2820_client_template; dev->i2c_client.adapter = &dev->i2c_adap; em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata)); if (i2c_scan) do_i2c_scan(dev->name, &dev->i2c_client); return 0; } /* * em2820_i2c_unregister() * unregister i2c_bus */ int em2820_i2c_unregister(struct em2820 *dev) { i2c_del_adapter(&dev->i2c_adap); return 0; }