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[media] af9015: improve af9015_eeprom_hash() 

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-09-12 20:23:51 -03:00 committed by Mauro Carvalho Chehab
parent f224749b68
commit 2e35c66f13
1 changed files with 19 additions and 28 deletions
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47
drivers/media/usb/dvb-usb-v2/af9015.c
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@ -398,43 +398,34 @@ error:
static int af9015_eeprom_hash(struct dvb_usb_device *d)
{
struct af9015_state *state = d_to_priv(d);
int ret;
static const unsigned int eeprom_size = 256;
unsigned int reg;
u8 val, *eeprom;
struct req_t req = {READ_I2C, AF9015_I2C_EEPROM, 0, 0, 1, 1, &val};
int ret, i;
static const unsigned int AF9015_EEPROM_SIZE = 256;
u8 buf[AF9015_EEPROM_SIZE];
struct req_t req = {READ_I2C, AF9015_I2C_EEPROM, 0, 0, 1, 1, NULL};
eeprom = kmalloc(eeprom_size, GFP_KERNEL);
if (eeprom == NULL)
return -ENOMEM;
for (reg = 0; reg < eeprom_size; reg++) {
req.addr = reg;
/* read eeprom */
for (i = 0; i < AF9015_EEPROM_SIZE; i++) {
req.addr = i;
req.data = &buf[i];
ret = af9015_ctrl_msg(d, &req);
if (ret)
goto free;
eeprom[reg] = val;
if (ret < 0)
goto err;
}
for (reg = 0; reg < eeprom_size; reg += 16)
dev_dbg(&d->udev->dev, "%s: %*ph\n", __func__, 16,
eeprom + reg);
BUG_ON(eeprom_size % 4);
state->eeprom_sum = 0;
for (reg = 0; reg < eeprom_size / sizeof(u32); reg++) {
/* calculate checksum */
for (i = 0; i < AF9015_EEPROM_SIZE / sizeof(u32); i++) {
state->eeprom_sum *= GOLDEN_RATIO_PRIME_32;
state->eeprom_sum += le32_to_cpu(((u32 *)eeprom)[reg]);
state->eeprom_sum += le32_to_cpu(((u32 *)buf)[i]);
}
for (i = 0; i < AF9015_EEPROM_SIZE; i += 16)
dev_dbg(&d->udev->dev, "%s: %*ph\n", __func__, 16, buf + i);
dev_dbg(&d->udev->dev, "%s: eeprom sum=%.8x\n",
__func__, state->eeprom_sum);
ret = 0;
free:
kfree(eeprom);
return 0;
err:
dev_err(&d->udev->dev, "%s: eeprom failed=%d\n", KBUILD_MODNAME, ret);
return ret;
}