From 03910cc39035d27f4c85c8ad2a236cc5c9456127 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sat, 3 Nov 2007 21:20:59 -0300 Subject: V4L/DVB (6536): Add a hint for boards without unique USB ID This patch adds a function to allow trying to detect boards that shares the generic IDs. The current detection method is based at eeprom checksum. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-i2c.c | 74 +++++++++++++++------------------ 1 file changed, 34 insertions(+), 40 deletions(-) (limited to 'drivers/media/video/em28xx/em28xx-i2c.c') diff --git a/drivers/media/video/em28xx/em28xx-i2c.c b/drivers/media/video/em28xx/em28xx-i2c.c index a33878e0879..e2003455f2b 100644 --- a/drivers/media/video/em28xx/em28xx-i2c.c +++ b/drivers/media/video/em28xx/em28xx-i2c.c @@ -292,6 +292,31 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap, 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; @@ -335,7 +360,11 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len) printk("\n"); } - printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id); + if (em_eeprom->id == 0x9567eb1a) + dev->hash = em28xx_hash_mem(eedata, len, 32); + + printk(KERN_INFO "EEPROM ID= 0x%08x, hash = 0x%08lx\n", + em_eeprom->id, dev->hash); printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID, em_eeprom->product_ID); @@ -392,43 +421,6 @@ static u32 functionality(struct i2c_adapter *adap) } -static int em28xx_tuner_callback(void *ptr, int command, int arg) -{ - int rc = 0; - struct em28xx *dev = ptr; - - if (dev->tuner_type != TUNER_XC2028) - return 0; - - switch (command) { - case XC2028_TUNER_RESET: - /* FIXME: This is device-dependent */ - dev->em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1); - dev->em28xx_write_regs_req(dev, 0x00, 0x12, "\x67", 1); - - msleep(140); - break; - } - return rc; -} - -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; - tun_setup.tuner_callback = em28xx_tuner_callback; - - 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 @@ -487,9 +479,11 @@ static int attach_inform(struct i2c_client *client) break; default: + if (!dev->tuner_addr) + dev->tuner_addr = client->addr; + dprintk1(1,"attach inform: detected I2C address %x\n", client->addr << 1); - dev->tuner_addr = client->addr; - em28xx_set_tuner(-1, client); + } return 0; -- cgit v1.2.3