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rtc-pcf8563: remove client validation 

Validating clients with black magic register checks doesn't make much
sense for new-style i2c driver and has been known to fail on valid NXP
pcf8563 chips.  This patch removes the client validation code.

Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Laurent Pinchart 2008-10-15 22:02:55 -07:00 committed by Linus Torvalds
parent 8d7b48e0bc
commit 5d5b4d74f9
1 changed files with 0 additions and 58 deletions
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58
drivers/rtc/rtc-pcf8563.c
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@ -179,58 +179,6 @@ struct pcf8563_limit
unsigned char max;
};
static int pcf8563_validate_client(struct i2c_client *client)
{
int i;
static const struct pcf8563_limit pattern[] = {
/* register, mask, min, max */
{ PCF8563_REG_SC, 0x7F, 0, 59 },
{ PCF8563_REG_MN, 0x7F, 0, 59 },
{ PCF8563_REG_HR, 0x3F, 0, 23 },
{ PCF8563_REG_DM, 0x3F, 0, 31 },
{ PCF8563_REG_MO, 0x1F, 0, 12 },
};
/* check limits (only registers with bcd values) */
for (i = 0; i < ARRAY_SIZE(pattern); i++) {
int xfer;
unsigned char value;
unsigned char buf = pattern[i].reg;
struct i2c_msg msgs[] = {
{ client->addr, 0, 1, &buf },
{ client->addr, I2C_M_RD, 1, &buf },
};
xfer = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (xfer != ARRAY_SIZE(msgs)) {
dev_err(&client->dev,
"%s: could not read register 0x%02X\n",
__func__, pattern[i].reg);
return -EIO;
}
value = BCD2BIN(buf & pattern[i].mask);
if (value > pattern[i].max ||
value < pattern[i].min) {
dev_dbg(&client->dev,
"%s: pattern=%d, reg=%x, mask=0x%02x, min=%d, "
"max=%d, value=%d, raw=0x%02X\n",
__func__, i, pattern[i].reg, pattern[i].mask,
pattern[i].min, pattern[i].max,
value, buf);
return -ENODEV;
}
}
return 0;
}
static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
return pcf8563_get_datetime(to_i2c_client(dev), tm);
@ -262,12 +210,6 @@ static int pcf8563_probe(struct i2c_client *client,
if (!pcf8563)
return -ENOMEM;
/* Verify the chip is really an PCF8563 */
if (pcf8563_validate_client(client) < 0) {
err = -ENODEV;
goto exit_kfree;
}
dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
pcf8563->rtc = rtc_device_register(pcf8563_driver.driver.name,