| /* |
| em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices |
| |
| Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it> |
| Markus Rechberger <mrechberger@gmail.com> |
| Mauro Carvalho Chehab <mchehab@infradead.org> |
| Sascha Sommer <saschasommer@freenet.de> |
| |
| 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 <linux/video_decoder.h> |
| |
| #include "em28xx.h" |
| #include <media/v4l2-common.h> |
| #include <media/tuner.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 dprintk1(lvl,fmt, args...) if (i2c_debug>=lvl) do {\ |
| printk(fmt, ##args); } while (0) |
| #define dprintk2(lvl,fmt, args...) if (i2c_debug>=lvl) do{ \ |
| printk(KERN_DEBUG "%s at %s: " fmt, \ |
| dev->name, __FUNCTION__ , ##args); } while (0) |
| |
| /* |
| * em2800_i2c_send_max4() |
| * send up to 4 bytes to the i2c device |
| */ |
| static int em2800_i2c_send_max4(struct em28xx *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->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len); |
| if (ret != 2 + len) { |
| em28xx_warn("writing 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->em28xx_read_reg(dev, 0x05); |
| if (ret == 0x80 + len - 1) |
| return len; |
| msleep(5); |
| } |
| em28xx_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 em28xx *dev = (struct em28xx *)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 em28xx *dev, unsigned char addr) |
| { |
| char msg; |
| int ret; |
| int write_timeout; |
| msg = addr; |
| ret = dev->em28xx_write_regs(dev, 0x04, &msg, 1); |
| if (ret < 0) { |
| em28xx_warn("setting i2c device address failed (error=%i)\n", |
| ret); |
| return ret; |
| } |
| msg = 0x84; |
| ret = dev->em28xx_write_regs(dev, 0x05, &msg, 1); |
| if (ret < 0) { |
| em28xx_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->em28xx_read_reg(dev, 0x5); |
| if (msg == 0x94) |
| return -ENODEV; |
| else if (msg == 0x84) |
| return 0; |
| msleep(5); |
| } |
| return -ENODEV; |
| } |
| |
| /* |
| * em2800_i2c_recv_bytes() |
| * read from the i2c device |
| */ |
| static int em2800_i2c_recv_bytes(struct em28xx *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) { |
| em28xx_warn |
| ("preparing read at i2c address 0x%x failed (error=%i)\n", |
| addr, ret); |
| return ret; |
| } |
| ret = dev->em28xx_read_reg_req_len(dev, 0x0, 0x3, buf, len); |
| if (ret < 0) { |
| em28xx_warn("reading from i2c device at 0x%x failed (error=%i)", |
| addr, ret); |
| return ret; |
| } |
| return ret; |
| } |
| |
| /* |
| * em28xx_i2c_send_bytes() |
| * untested for more than 4 bytes |
| */ |
| static int em28xx_i2c_send_bytes(void *data, unsigned char addr, char *buf, |
| short len, int stop) |
| { |
| int wrcount = 0; |
| struct em28xx *dev = (struct em28xx *)data; |
| |
| wrcount = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len); |
| |
| return wrcount; |
| } |
| |
| /* |
| * em28xx_i2c_recv_bytes() |
| * read a byte from the i2c device |
| */ |
| static int em28xx_i2c_recv_bytes(struct em28xx *dev, unsigned char addr, |
| char *buf, int len) |
| { |
| int ret; |
| ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len); |
| if (ret < 0) { |
| em28xx_warn("reading i2c device failed (error=%i)\n", ret); |
| return ret; |
| } |
| if (dev->em28xx_read_reg(dev, 0x5) != 0) |
| return -ENODEV; |
| return ret; |
| } |
| |
| /* |
| * em28xx_i2c_check_for_device() |
| * check if there is a i2c_device at the supplied address |
| */ |
| static int em28xx_i2c_check_for_device(struct em28xx *dev, unsigned char addr) |
| { |
| char msg; |
| int ret; |
| msg = addr; |
| |
| ret = dev->em28xx_read_reg_req(dev, 2, addr); |
| if (ret < 0) { |
| em28xx_warn("reading from i2c device failed (error=%i)\n", ret); |
| return ret; |
| } |
| if (dev->em28xx_read_reg(dev, 0x5) != 0) |
| return -ENODEV; |
| return 0; |
| } |
| |
| /* |
| * em28xx_i2c_xfer() |
| * the main i2c transfer function |
| */ |
| static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap, |
| struct i2c_msg msgs[], int num) |
| { |
| struct em28xx *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; |
| 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 */ |
| if (dev->is_em2800) |
| rc = em2800_i2c_check_for_device(dev, addr); |
| else |
| rc = em28xx_i2c_check_for_device(dev, addr); |
| if (rc < 0) { |
| dprintk2(2," 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 = em28xx_i2c_recv_bytes(dev, addr, |
| msgs[i].buf, |
| msgs[i].len); |
| if (i2c_debug>=2) { |
| for (byte = 0; byte < msgs[i].len; byte++) { |
| printk(" %02x", msgs[i].buf[byte]); |
| } |
| } |
| } else { |
| /* write bytes */ |
| if (i2c_debug>=2) { |
| 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 = em28xx_i2c_send_bytes(dev, addr, |
| msgs[i].buf, |
| msgs[i].len, |
| i == num - 1); |
| } |
| if (rc < 0) |
| goto err; |
| if (i2c_debug>=2) |
| printk("\n"); |
| } |
| |
| return num; |
| err: |
| dprintk2(2," ERROR: %i\n", rc); |
| return rc; |
| } |
| |
| static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len) |
| { |
| unsigned char buf, *p = eedata; |
| struct em28xx_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; |
| } |
| printk(KERN_INFO "Table at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n", |
| em_eeprom->string_idx_table,em_eeprom->string1, |
| em_eeprom->string2,em_eeprom->string3); |
| |
| 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; |
| } |
| |
| |
| static int em28xx_set_tuner(int check_eeprom, struct i2c_client *client) |
| { |
| struct em28xx *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; |
| em28xx_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 em28xx *dev = client->adapter->algo_data; |
| |
| switch (client->addr << 1) { |
| case 0x43: |
| case 0x4b: |
| { |
| struct tuner_setup tun_setup; |
| |
| tun_setup.mode_mask = T_ANALOG_TV | T_RADIO; |
| tun_setup.type = TUNER_TDA9887; |
| tun_setup.addr = client->addr; |
| |
| em28xx_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup); |
| em28xx_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf); |
| break; |
| } |
| case 0x42: |
| dprintk1(1,"attach_inform: saa7114 detected.\n"); |
| break; |
| case 0x4a: |
| dprintk1(1,"attach_inform: saa7113 detected.\n"); |
| break; |
| case 0xa0: |
| dprintk1(1,"attach_inform: eeprom detected.\n"); |
| break; |
| case 0x60: |
| case 0x8e: |
| { |
| struct IR_i2c *ir = i2c_get_clientdata(client); |
| dprintk1(1,"attach_inform: IR detected (%s).\n",ir->phys); |
| em28xx_set_ir(dev,ir); |
| break; |
| } |
| case 0x80: |
| case 0x88: |
| dprintk1(1,"attach_inform: msp34xx detected.\n"); |
| break; |
| case 0xb8: |
| case 0xba: |
| dprintk1(1,"attach_inform: tvp5150 detected.\n"); |
| break; |
| |
| default: |
| dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1); |
| dev->tuner_addr = client->addr; |
| em28xx_set_tuner(-1, client); |
| } |
| |
| return 0; |
| } |
| |
| static struct i2c_algorithm em28xx_algo = { |
| .master_xfer = em28xx_i2c_xfer, |
| .algo_control = algo_control, |
| .functionality = functionality, |
| }; |
| |
| static struct i2c_adapter em28xx_adap_template = { |
| .owner = THIS_MODULE, |
| .class = I2C_CLASS_TV_ANALOG, |
| .name = "em28xx", |
| .id = I2C_HW_B_EM28XX, |
| .algo = &em28xx_algo, |
| .client_register = attach_inform, |
| }; |
| |
| static struct i2c_client em28xx_client_template = { |
| .name = "em28xx internal", |
| }; |
| |
| /* ----------------------------------------------------------- */ |
| |
| /* |
| * 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 < ARRAY_SIZE(i2c_devs); 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] : "???"); |
| } |
| } |
| |
| /* |
| * em28xx_i2c_call_clients() |
| * send commands to all attached i2c devices |
| */ |
| void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg) |
| { |
| BUG_ON(NULL == dev->i2c_adap.algo_data); |
| i2c_clients_command(&dev->i2c_adap, cmd, arg); |
| } |
| |
| /* |
| * em28xx_i2c_register() |
| * register i2c bus |
| */ |
| int em28xx_i2c_register(struct em28xx *dev) |
| { |
| BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg); |
| BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req); |
| dev->i2c_adap = em28xx_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 = em28xx_client_template; |
| dev->i2c_client.adapter = &dev->i2c_adap; |
| |
| em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata)); |
| |
| if (i2c_scan) |
| do_i2c_scan(dev->name, &dev->i2c_client); |
| return 0; |
| } |
| |
| /* |
| * em28xx_i2c_unregister() |
| * unregister i2c_bus |
| */ |
| int em28xx_i2c_unregister(struct em28xx *dev) |
| { |
| i2c_del_adapter(&dev->i2c_adap); |
| return 0; |
| } |