| /* |
| 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 "em28xx.h" |
| #include "tuner-xc2028.h" |
| #include <media/v4l2-common.h> |
| #include <media/tuner.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) |
| |
| /* |
| * 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 reg = dev->em28xx_read_reg(dev, 0x5); |
| |
| if (reg == 0x94) |
| return -ENODEV; |
| else if (reg == 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->board.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->board.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->board.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; |
| } |
| |
| /* based on linux/sunrpc/svcauth.h and linux/hash.h |
| * The original hash function returns a different value, if arch is x86_64 |
| * or i386. |
| */ |
| static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits) |
| { |
| unsigned long hash = 0; |
| unsigned long l = 0; |
| int len = 0; |
| unsigned char c; |
| do { |
| if (len == length) { |
| c = (char)len; |
| len = -1; |
| } else |
| c = *buf++; |
| l = (l << 8) | c; |
| len++; |
| if ((len & (32 / 8 - 1)) == 0) |
| hash = ((hash^l) * 0x9e370001UL); |
| } while (len); |
| |
| return (hash >> (32 - bits)) & 0xffffffffUL; |
| } |
| |
| 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; |
| |
| if (dev->chip_id == CHIP_ID_EM2874) { |
| /* Empia switched to a 16-bit addressable eeprom in newer |
| devices. While we could certainly write a routine to read |
| the eeprom, there is nothing of use in there that cannot be |
| accessed through registers, and there is the risk that we |
| could corrupt the eeprom (since a 16-bit read call is |
| interpreted as a write call by 8-bit eeproms). |
| */ |
| return 0; |
| } |
| |
| dev->i2c_client.addr = 0xa0 >> 1; |
| |
| /* Check if board has eeprom */ |
| err = i2c_master_recv(&dev->i2c_client, &buf, 0); |
| if (err < 0) { |
| em28xx_errdev("board has no eeprom\n"); |
| memset(eedata, 0, len); |
| return -ENODEV; |
| } |
| |
| buf = 0; |
| |
| err = i2c_master_send(&dev->i2c_client, &buf, 1); |
| if (err != 1) { |
| printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", |
| dev->name, err); |
| return err; |
| } |
| 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 err; |
| } |
| 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"); |
| } |
| |
| if (em_eeprom->id == 0x9567eb1a) |
| dev->hash = em28xx_hash_mem(eedata, len, 32); |
| |
| printk(KERN_INFO "%s: EEPROM ID= 0x%08x, EEPROM hash = 0x%08lx\n", |
| dev->name, em_eeprom->id, dev->hash); |
| |
| printk(KERN_INFO "%s: EEPROM info:\n", dev->name); |
| |
| switch (em_eeprom->chip_conf >> 4 & 0x3) { |
| case 0: |
| printk(KERN_INFO "%s:\tNo audio on board.\n", dev->name); |
| break; |
| case 1: |
| printk(KERN_INFO "%s:\tAC97 audio (5 sample rates)\n", |
| dev->name); |
| break; |
| case 2: |
| printk(KERN_INFO "%s:\tI2S audio, sample rate=32k\n", |
| dev->name); |
| break; |
| case 3: |
| printk(KERN_INFO "%s:\tI2S audio, 3 sample rates\n", |
| dev->name); |
| break; |
| } |
| |
| if (em_eeprom->chip_conf & 1 << 3) |
| printk(KERN_INFO "%s:\tUSB Remote wakeup capable\n", dev->name); |
| |
| if (em_eeprom->chip_conf & 1 << 2) |
| printk(KERN_INFO "%s:\tUSB Self power capable\n", dev->name); |
| |
| switch (em_eeprom->chip_conf & 0x3) { |
| case 0: |
| printk(KERN_INFO "%s:\t500mA max power\n", dev->name); |
| break; |
| case 1: |
| printk(KERN_INFO "%s:\t400mA max power\n", dev->name); |
| break; |
| case 2: |
| printk(KERN_INFO "%s:\t300mA max power\n", dev->name); |
| break; |
| case 3: |
| printk(KERN_INFO "%s:\t200mA max power\n", dev->name); |
| break; |
| } |
| printk(KERN_INFO "%s:\tTable at 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n", |
| dev->name, |
| em_eeprom->string_idx_table, |
| em_eeprom->string1, |
| em_eeprom->string2, |
| em_eeprom->string3); |
| |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------- */ |
| |
| /* |
| * functionality() |
| */ |
| static u32 functionality(struct i2c_adapter *adap) |
| { |
| return I2C_FUNC_SMBUS_EMUL; |
| } |
| |
| static struct i2c_algorithm em28xx_algo = { |
| .master_xfer = em28xx_i2c_xfer, |
| .functionality = functionality, |
| }; |
| |
| static struct i2c_adapter em28xx_adap_template = { |
| .owner = THIS_MODULE, |
| .name = "em28xx", |
| .id = I2C_HW_B_EM28XX, |
| .algo = &em28xx_algo, |
| }; |
| |
| 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", |
| [0xb0 >> 1] = "tda9874", |
| [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 |
| */ |
| void em28xx_do_i2c_scan(struct em28xx *dev) |
| { |
| u8 i2c_devicelist[128]; |
| unsigned char buf; |
| int i, rc; |
| |
| memset(i2c_devicelist, 0, ARRAY_SIZE(i2c_devicelist)); |
| |
| for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { |
| dev->i2c_client.addr = i; |
| rc = i2c_master_recv(&dev->i2c_client, &buf, 0); |
| if (rc < 0) |
| continue; |
| i2c_devicelist[i] = i; |
| printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", |
| dev->name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); |
| } |
| |
| dev->i2c_hash = em28xx_hash_mem(i2c_devicelist, |
| ARRAY_SIZE(i2c_devicelist), 32); |
| } |
| |
| /* |
| * em28xx_i2c_register() |
| * register i2c bus |
| */ |
| int em28xx_i2c_register(struct em28xx *dev) |
| { |
| int retval; |
| |
| 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_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); |
| |
| retval = i2c_add_adapter(&dev->i2c_adap); |
| if (retval < 0) { |
| em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n", |
| __func__, retval); |
| return retval; |
| } |
| |
| dev->i2c_client = em28xx_client_template; |
| dev->i2c_client.adapter = &dev->i2c_adap; |
| |
| retval = em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata)); |
| if ((retval < 0) && (retval != -ENODEV)) { |
| em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n", |
| __func__, retval); |
| |
| return retval; |
| } |
| |
| if (i2c_scan) |
| em28xx_do_i2c_scan(dev); |
| |
| /* Instantiate the IR receiver device, if present */ |
| em28xx_register_i2c_ir(dev); |
| |
| return 0; |
| } |
| |
| /* |
| * em28xx_i2c_unregister() |
| * unregister i2c_bus |
| */ |
| int em28xx_i2c_unregister(struct em28xx *dev) |
| { |
| i2c_del_adapter(&dev->i2c_adap); |
| return 0; |
| } |