Messages in this thread | | | Subject | Re: [PATCH 1/3] drivers: misc: ak8974 / ami305 magnetometer driver | From | Onkalo Samu <> | Date | Mon, 30 Aug 2010 10:12:41 +0300 |
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Hi Sundar,
On Sat, 2010-08-28 at 18:10 +0200, ext Sundar wrote: > Hi Samu, > > few minor comments, > > On Fri, Aug 27, 2010 at 5:24 PM, Samu Onkalo <samu.p.onkalo@nokia.com> wrote: > > + > > +struct ak8974_chip { > > + struct miscdevice miscdev; > > + struct mutex lock; /* Serialize access to chip */ > > + struct mutex users_lock; > > + struct i2c_client *client; > > + struct regulator_bulk_data regs[2]; > > + struct work_struct work; > > + wait_queue_head_t misc_wait; > > + loff_t offset; > > + > > + int max_range; > > + int users; > > + > > + const char *id; > > + u8 info[2]; > > + > > + s16 x, y, z; /* Latest measurements */ > > + s8 axis_x; > > + s8 axis_y; > > + s8 axis_z; > > + bool valid; > > + > > + char name[20]; > > +}; > > This can be static ?
It is filled based on the detected chip type.
> > > + > > + ak8974_regulators_off(chip); > > + > > [..] > > > + if (err < 0) { > > + dev_err(&chip->client->dev, "Device registration failed\n"); > > + goto fail3; > > + } > > [..] > > > + return 0; > > +fail4: > > + misc_deregister(&chip->miscdev); > > +fail3: > > + ak8974_regulators_off(chip); > > in case of fail3, regulators get disabled twice. i think we will have > unbalanced calls to the supplies then. >
Yes, you are correct.
> > + > > + > > +#ifdef CONFIG_PM > > +static int ak8974_suspend(struct i2c_client *client, pm_message_t mesg) > > +{ > > + struct ak8974_chip *chip = i2c_get_clientdata(client); > > + mutex_lock(&chip->users_lock); > > + if (chip->users > 0) > > + ak8974_enable(chip, AK8974_PWR_OFF); > > + mutex_unlock(&chip->users_lock); > > + return 0; > > +} > > Can we disable the regulators here too?
It would require some more operations since the chip would loose its state totally. But yes, it could be done.
-Samu
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