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[89.39.107.113]) by smtp.gmail.com with ESMTPSA id cm10-20020a0564020c8a00b00436f3107bdasm4461390edb.38.2022.07.11.07.41.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Jul 2022 07:41:48 -0700 (PDT) From: Yassine Oudjana X-Google-Original-From: Yassine Oudjana To: Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Tianshu Qiu , Bingbu Cao Cc: Yassine Oudjana , Yassine Oudjana , Jacopo Mondi , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] media: i2c: ak7375: Add regulator management Date: Mon, 11 Jul 2022 18:40:39 +0400 Message-Id: <20220711144039.232196-4-y.oudjana@protonmail.com> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220711144039.232196-1-y.oudjana@protonmail.com> References: <20220711144039.232196-1-y.oudjana@protonmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Yassine Oudjana Make the driver get needed regulators on probe and enable/disable them on runtime PM callbacks. Signed-off-by: Yassine Oudjana Tested-by: Umang Jain --- Changes since v1: - Reorganize variable declaration - Change the power-on delay range to 3000-3500 microseconds. drivers/media/i2c/ak7375.c | 39 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c index 40b1a4aa846c..c2b2542a0056 100644 --- a/drivers/media/i2c/ak7375.c +++ b/drivers/media/i2c/ak7375.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include @@ -23,17 +24,32 @@ */ #define AK7375_CTRL_STEPS 64 #define AK7375_CTRL_DELAY_US 1000 +/* + * The vcm takes around 3 ms to power on and start taking + * I2C messages. This value was found experimentally due to + * lack of documentation. + */ +#define AK7375_POWER_DELAY_US 3000 #define AK7375_REG_POSITION 0x0 #define AK7375_REG_CONT 0x2 #define AK7375_MODE_ACTIVE 0x0 #define AK7375_MODE_STANDBY 0x40 +static const char * const ak7375_supply_names[] = { + "vdd", + "vio", +}; + +#define AK7375_NUM_SUPPLIES ARRAY_SIZE(ak7375_supply_names) + /* ak7375 device structure */ struct ak7375_device { struct v4l2_ctrl_handler ctrls_vcm; struct v4l2_subdev sd; struct v4l2_ctrl *focus; + struct regulator_bulk_data supplies[AK7375_NUM_SUPPLIES]; + /* active or standby mode */ bool active; }; @@ -133,12 +149,24 @@ static int ak7375_probe(struct i2c_client *client) { struct ak7375_device *ak7375_dev; int ret; + int i; ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev), GFP_KERNEL); if (!ak7375_dev) return -ENOMEM; + for (i = 0; i < AK7375_NUM_SUPPLIES; i++) + ak7375_dev->supplies[i].supply = ak7375_supply_names[i]; + + ret = devm_regulator_bulk_get(&client->dev, AK7375_NUM_SUPPLIES, + ak7375_dev->supplies); + if (ret) { + dev_err(&client->dev, "Failed to get regulators: %pe", + ERR_PTR(ret)); + return ret; + } + v4l2_i2c_subdev_init(&ak7375_dev->sd, client, &ak7375_ops); ak7375_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; ak7375_dev->sd.internal_ops = &ak7375_int_ops; @@ -210,6 +238,10 @@ static int __maybe_unused ak7375_vcm_suspend(struct device *dev) if (ret) dev_err(dev, "%s I2C failure: %d\n", __func__, ret); + ret = regulator_bulk_disable(AK7375_NUM_SUPPLIES, ak7375_dev->supplies); + if (ret) + return ret; + ak7375_dev->active = false; return 0; @@ -230,6 +262,13 @@ static int __maybe_unused ak7375_vcm_resume(struct device *dev) if (ak7375_dev->active) return 0; + ret = regulator_bulk_enable(AK7375_NUM_SUPPLIES, ak7375_dev->supplies); + if (ret) + return ret; + + /* Wait for vcm to become ready */ + usleep_range(AK7375_POWER_DELAY_US, AK7375_POWER_DELAY_US + 500); + ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT, AK7375_MODE_ACTIVE, 1); if (ret) {