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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id h40-v6sm958144edh.88.2018.09.20.09.19.15 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Sep 2018 09:19:16 -0700 (PDT) From: Ricardo Ribalda Delgado To: Pavel Machek , Sakari Ailus , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Verkuil , Laurent Pinchart Cc: Ricardo Ribalda Delgado Subject: [PATCH 2/4] [media] ad5820: Add support for enable pin Date: Thu, 20 Sep 2018 18:19:10 +0200 Message-Id: <20180920161912.17063-2-ricardo.ribalda@gmail.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180920161912.17063-1-ricardo.ribalda@gmail.com> References: <20180920161912.17063-1-ricardo.ribalda@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds support for a programmable enable pin. It can be used in situations where the ANA-vcc is not configurable (dummy-regulator), or just to have a more fine control of the power saving. The use of the enable pin is optional Signed-off-by: Ricardo Ribalda Delgado --- drivers/media/i2c/Kconfig | 2 +- drivers/media/i2c/ad5820.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index bfdb494686bf..1ba6eaaf58fb 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -321,7 +321,7 @@ config VIDEO_ML86V7667 config VIDEO_AD5820 tristate "AD5820 lens voice coil support" - depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER + depends on GPIOLIB && I2C && VIDEO_V4L2 && MEDIA_CONTROLLER ---help--- This is a driver for the AD5820 camera lens voice coil. It is used for example in Nokia N900 (RX-51). diff --git a/drivers/media/i2c/ad5820.c b/drivers/media/i2c/ad5820.c index 22759aaa2dba..20931217e3b1 100644 --- a/drivers/media/i2c/ad5820.c +++ b/drivers/media/i2c/ad5820.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -55,6 +56,8 @@ struct ad5820_device { u32 focus_ramp_time; u32 focus_ramp_mode; + struct gpio_desc *enable_gpio; + struct mutex power_lock; int power_count; @@ -122,6 +125,9 @@ static int ad5820_power_off(struct ad5820_device *coil, bool standby) ret = ad5820_update_hw(coil); } + if (coil->enable_gpio) + gpiod_set_value_cansleep(coil->enable_gpio, 0); + ret2 = regulator_disable(coil->vana); if (ret) return ret; @@ -136,6 +142,9 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) if (ret < 0) return ret; + if (coil->enable_gpio) + gpiod_set_value_cansleep(coil->enable_gpio, 1); + if (restore) { /* Restore the hardware settings. */ coil->standby = false; @@ -146,6 +155,8 @@ static int ad5820_power_on(struct ad5820_device *coil, bool restore) return 0; fail: + if (coil->enable_gpio) + gpiod_set_value_cansleep(coil->enable_gpio, 0); coil->standby = true; regulator_disable(coil->vana); @@ -312,6 +323,15 @@ static int ad5820_probe(struct i2c_client *client, return ret; } + coil->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(coil->enable_gpio)) { + ret = PTR_ERR(coil->enable_gpio); + if (ret == -EPROBE_DEFER) + dev_err(&client->dev, "could not get enable gpio\n"); + return ret; + } + mutex_init(&coil->power_lock); v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops); -- 2.18.0