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| author | Philipp Zabel <philipp.zabel@gmail.com> | 2009-05-28 21:00:03 +0200 |
|---|---|---|
| committer | Liam Girdwood <lrg@slimlogic.co.uk> | 2009-06-15 11:18:27 +0100 |
| commit | c8f1e5025ca2fa8e6e037451f3d271e66745a19b (patch) | |
| tree | 22d0cc384cee47f639163daa15a1d6dff91da1b4 /drivers/regulator | |
| parent | b110a8fb242bc34e4b7686252899ce0fca956e2c (diff) | |
| download | linux-c8f1e5025ca2fa8e6e037451f3d271e66745a19b.tar.gz linux-c8f1e5025ca2fa8e6e037451f3d271e66745a19b.tar.bz2 linux-c8f1e5025ca2fa8e6e037451f3d271e66745a19b.zip | |
regulator/max1586: fix V3 gain calculation integer overflow
On Thu, May 28, 2009 at 10:59 AM, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote:
> On Thu, May 28, 2009 at 07:15:16AM +0200, Philipp Zabel wrote:
>> The V3 regulator can be configured with an external resistor
>> connected to the feedback pin (R24 in the data sheet) to
>> increase the voltage range.
>>
>> For example, hx4700 has R24 = 3.32 kOhm to achieve a maximum
>> V3 voltage of 1.55 V which is needed for 624 MHz CPU frequency.
>>
>> Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
>
> Looks good.
>
> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Thanks, but it turns out I hit a 32 bit integer overflow in
the gain calculation. I'd like to mend that with the following
patch. Now max_uV could be increased up to 4.294 V, enough to
charge LiPo cells.
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/max1586.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/regulator/max1586.c b/drivers/regulator/max1586.c index 92799f40c864..2c082d3ef484 100644 --- a/drivers/regulator/max1586.c +++ b/drivers/regulator/max1586.c @@ -40,8 +40,8 @@ struct max1586_data { struct i2c_client *client; /* min/max V3 voltage */ - int min_uV; - int max_uV; + unsigned int min_uV; + unsigned int max_uV; struct regulator_dev *rdev[0]; }; @@ -199,8 +199,8 @@ static int max1586_pmic_probe(struct i2c_client *client, ret = -EINVAL; goto out_unmap; } - max1586->min_uV = MAX1586_V3_MIN_UV * pdata->v3_gain / 1000000; - max1586->max_uV = MAX1586_V3_MAX_UV * pdata->v3_gain / 1000000; + max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000; + max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000; rdev = max1586->rdev; for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { |