Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932157AbbEHSaY (ORCPT ); Fri, 8 May 2015 14:30:24 -0400 Received: from saturn.retrosnub.co.uk ([178.18.118.26]:52530 "EHLO saturn.retrosnub.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753615AbbEHSaU (ORCPT ); Fri, 8 May 2015 14:30:20 -0400 Message-ID: <554CC35B.2050609@kernel.org> Date: Fri, 08 May 2015 10:08:27 -0400 From: Jonathan Cameron User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: Daniel Baluta , pmeerw@pmeerw.net CC: knaack.h@gmx.de, lars@metafoo.de, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Subject: Re: [PATCH v2 2/3] iio: magnetometer: mmc35240: Add PM sleep support References: <1429891112-11888-1-git-send-email-daniel.baluta@intel.com> <1429891112-11888-3-git-send-email-daniel.baluta@intel.com> In-Reply-To: <1429891112-11888-3-git-send-email-daniel.baluta@intel.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2387 Lines: 77 On 24/04/15 11:58, Daniel Baluta wrote: > We rely on regmap to save the state of the registers at suspend, > and then we do an explicit sync at resume. > > Signed-off-by: Daniel Baluta Applied > --- > drivers/iio/magnetometer/mmc35240.c | 35 +++++++++++++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > > diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c > index beefebc..7a52c3e 100644 > --- a/drivers/iio/magnetometer/mmc35240.c > +++ b/drivers/iio/magnetometer/mmc35240.c > @@ -17,6 +17,7 @@ > #include > #include > #include > +#include > > #include > #include > @@ -447,6 +448,39 @@ static int mmc35240_probe(struct i2c_client *client, > return devm_iio_device_register(&client->dev, indio_dev); > } > > +#ifdef CONFIG_PM_SLEEP > +static int mmc35240_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct mmc35240_data *data = iio_priv(indio_dev); > + > + regcache_cache_only(data->regmap, true); > + > + return 0; > +} > + > +static int mmc35240_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); > + struct mmc35240_data *data = iio_priv(indio_dev); > + int ret; > + > + regcache_mark_dirty(data->regmap); > + ret = regcache_sync_region(data->regmap, MMC35240_REG_CTRL0, > + MMC35240_REG_CTRL1); > + if (ret < 0) > + dev_err(dev, "Failed to restore control registers\n"); > + > + regcache_cache_only(data->regmap, false); > + > + return 0; > +} > +#endif > + > +static const struct dev_pm_ops mmc35240_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(mmc35240_suspend, mmc35240_resume) > +}; > + > static const struct i2c_device_id mmc35240_id[] = { > {"MMC35240", 0}, > {} > @@ -456,6 +490,7 @@ MODULE_DEVICE_TABLE(i2c, mmc35240_id); > static struct i2c_driver mmc35240_driver = { > .driver = { > .name = MMC35240_DRV_NAME, > + .pm = &mmc35240_pm_ops, > }, > .probe = mmc35240_probe, > .id_table = mmc35240_id, > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/