From patchwork Tue Feb 4 09:30:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Heidelberg X-Patchwork-Id: 11364265 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A6E611398 for ; Tue, 4 Feb 2020 09:34:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8FA052166E for ; Tue, 4 Feb 2020 09:34:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726343AbgBDJej (ORCPT ); Tue, 4 Feb 2020 04:34:39 -0500 Received: from ip-78-45-52-129.net.upcbroadband.cz ([78.45.52.129]:49326 "EHLO ixit.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726196AbgBDJei (ORCPT ); Tue, 4 Feb 2020 04:34:38 -0500 Received: from localhost.localdomain (126.212-243-81.adsl-dyn.isp.belgacom.be [81.243.212.126]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ixit.cz (Postfix) with ESMTPSA id 2884525201; Tue, 4 Feb 2020 10:34:36 +0100 (CET) From: David Heidelberg To: Dmitry Osipenko , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Daniel Baluta , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring , Mark Rutland Cc: David Heidelberg , linux-iio@vger.kernel.org Subject: [PATCH v4 5/7] iio: light: al3320a implement suspend support Date: Tue, 4 Feb 2020 10:30:36 +0100 Message-Id: <20200204093031.616409-6-david@ixit.cz> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200204093031.616409-1-david@ixit.cz> References: <20200204093031.616409-1-david@ixit.cz> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org AL3320a is fairly simple chip, so for suspend is enough to disable and later enable it again. Signed-off-by: David Heidelberg --- drivers/iio/light/al3320a.c | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-) diff --git a/drivers/iio/light/al3320a.c b/drivers/iio/light/al3320a.c index 89b935b4fe9e..affa4c6c199a 100644 --- a/drivers/iio/light/al3320a.c +++ b/drivers/iio/light/al3320a.c @@ -7,6 +7,9 @@ * IIO driver for AL3320A (7-bit I2C slave address 0x1C). * * TODO: interrupt support, thresholds + * When the driver will get support for interrupt handling, then interrupt + * will need to be disabled before turning sensor OFF in order to avoid + * potential races with the interrupt handling. */ #include @@ -78,13 +81,18 @@ static const struct attribute_group al3320a_attribute_group = { .attrs = al3320a_attributes, }; +static int al3320a_set_pwr(struct i2c_client *client, bool pwr) +{ + u8 val = pwr ? AL3320A_CONFIG_ENABLE : AL3320A_CONFIG_DISABLE; + return i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG, val); +} + static int al3320a_init(struct al3320a_data *data) { int ret; - /* power on */ - ret = i2c_smbus_write_byte_data(data->client, AL3320A_REG_CONFIG, - AL3320A_CONFIG_ENABLE); + ret = al3320a_set_pwr(data->client, true); + if (ret < 0) return ret; @@ -203,10 +211,21 @@ static int al3320a_probe(struct i2c_client *client, static int al3320a_remove(struct i2c_client *client) { - return i2c_smbus_write_byte_data(client, AL3320A_REG_CONFIG, - AL3320A_CONFIG_DISABLE); + return al3320a_set_pwr(client, false); } +static int __maybe_unused al3320a_suspend(struct device *dev) +{ + return al3320a_set_pwr(to_i2c_client(dev), false); +} + +static int __maybe_unused al3320a_resume(struct device *dev) +{ + return al3320a_set_pwr(to_i2c_client(dev), true); +} + +SIMPLE_DEV_PM_OPS(al3320a_pm_ops, al3320a_suspend, al3320a_resume); + static const struct i2c_device_id al3320a_id[] = { {"al3320a", 0}, {} @@ -216,6 +235,7 @@ MODULE_DEVICE_TABLE(i2c, al3320a_id); static struct i2c_driver al3320a_driver = { .driver = { .name = AL3320A_DRV_NAME, + .pm = &al3320a_pm_ops, }, .probe = al3320a_probe, .remove = al3320a_remove,