From patchwork Thu Jan 9 15:45:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 1220484 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47tr6X73rXz9sR0 for ; Fri, 10 Jan 2020 02:45:24 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728988AbgAIPpV (ORCPT ); Thu, 9 Jan 2020 10:45:21 -0500 Received: from mga18.intel.com ([134.134.136.126]:35711 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728357AbgAIPpU (ORCPT ); Thu, 9 Jan 2020 10:45:20 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:45:07 -0800 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="303904700" Received: from paasikivi.fi.intel.com ([10.237.72.42]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:45:05 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id 14ABE207DD; Thu, 9 Jan 2020 17:44:33 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.92) (envelope-from ) id 1ipa01-000555-Ck; Thu, 09 Jan 2020 17:45:29 +0200 From: Sakari Ailus To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rajmohan.mani@intel.com, Tomasz Figa Subject: [PATCH v3 1/5] i2c: Allow driver to manage the device's power state during probe Date: Thu, 9 Jan 2020 17:45:25 +0200 Message-Id: <20200109154529.19484-2-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200109154529.19484-1-sakari.ailus@linux.intel.com> References: <20200109154529.19484-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Enable drivers to tell ACPI that there's no need to power on a device for probe. Drivers should still perform this by themselves if there's a need to. In some cases powering on the device during probe is undesirable, and this change enables a driver to choose what fits best for it. Signed-off-by: Sakari Ailus --- drivers/i2c/i2c-core-base.c | 15 ++++++++++++--- include/linux/i2c.h | 3 +++ 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 9f8dcd3f83850..7bf1699c9044d 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -303,6 +303,14 @@ static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client) return irq > 0 ? irq : -ENXIO; } +static bool probe_low_power(struct device *dev) +{ + struct i2c_driver *driver = to_i2c_driver(dev->driver); + + return driver->probe_low_power && + device_property_present(dev, "probe-low-power"); +} + static int i2c_device_probe(struct device *dev) { struct i2c_client *client = i2c_verify_client(dev); @@ -375,7 +383,8 @@ static int i2c_device_probe(struct device *dev) if (status < 0) goto err_clear_wakeup_irq; - status = dev_pm_domain_attach(&client->dev, true); + status = dev_pm_domain_attach(&client->dev, + !probe_low_power(&client->dev)); if (status) goto err_clear_wakeup_irq; @@ -397,7 +406,7 @@ static int i2c_device_probe(struct device *dev) return 0; err_detach_pm_domain: - dev_pm_domain_detach(&client->dev, true); + dev_pm_domain_detach(&client->dev, !probe_low_power(&client->dev)); err_clear_wakeup_irq: dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); @@ -419,7 +428,7 @@ static int i2c_device_remove(struct device *dev) status = driver->remove(client); } - dev_pm_domain_detach(&client->dev, true); + dev_pm_domain_detach(&client->dev, !probe_low_power(&client->dev)); dev_pm_clear_wake_irq(&client->dev); device_init_wakeup(&client->dev, false); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 582ef05ec07ed..6d0d6af393c56 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -229,6 +229,8 @@ enum i2c_alert_protocol { * @address_list: The I2C addresses to probe (for detect) * @clients: List of detected clients we created (for i2c-core use only) * @disable_i2c_core_irq_mapping: Tell the i2c-core to not do irq-mapping + * @probe_low_power: Let the driver manage the device's power state + * during probe and remove. * * The driver.owner field should be set to the module owner of this driver. * The driver.name field should be set to the name of this driver. @@ -289,6 +291,7 @@ struct i2c_driver { struct list_head clients; bool disable_i2c_core_irq_mapping; + bool probe_low_power; }; #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) From patchwork Thu Jan 9 15:45:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 1220478 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47tr5x0Rf1z9sPJ for ; Fri, 10 Jan 2020 02:44:52 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730916AbgAIPor (ORCPT ); Thu, 9 Jan 2020 10:44:47 -0500 Received: from mga11.intel.com ([192.55.52.93]:17759 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732547AbgAIPoi (ORCPT ); Thu, 9 Jan 2020 10:44:38 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:37 -0800 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="371333764" Received: from paasikivi.fi.intel.com ([10.237.72.42]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:35 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id 15C8B20B52; Thu, 9 Jan 2020 17:44:33 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.92) (envelope-from ) id 1ipa01-000558-Du; Thu, 09 Jan 2020 17:45:29 +0200 From: Sakari Ailus To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rajmohan.mani@intel.com, Tomasz Figa Subject: [PATCH v3 2/5] ACPI: Add a convenience function to tell a device is suspended in probe Date: Thu, 9 Jan 2020 17:45:26 +0200 Message-Id: <20200109154529.19484-3-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200109154529.19484-1-sakari.ailus@linux.intel.com> References: <20200109154529.19484-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add a convenience function to tell whether a device is suspended for probe or remove, for busses where the custom is that drivers don't need to resume devices in probe, or suspend them in their remove handlers. Returns false on non-ACPI systems. Suggested-by: Mika Westerberg Signed-off-by: Sakari Ailus --- drivers/acpi/device_pm.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 5 +++++ 2 files changed, 40 insertions(+) diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 5e4a8860a9c0c..87393020276d8 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1348,4 +1348,39 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) return 1; } EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); + +/** + * acpi_dev_low_power_state_probe - Tell if a device is in a low power state + * during probe + * @dev: The device + * + * Tell whether a given device is in a low power state during the driver's probe + * or remove operation. + * + * Drivers of devices on certain busses such as I²C can generally assume (on + * ACPI based systems) that the devices they control are powered on without + * driver having to do anything about it. Using struct + * device_driver.probe_low_power and "probe-low-power" property, this can be + * negated and the driver has full control of the device power management. + * Always returns false on non-ACPI based systems. True is returned on ACPI + * based systems iff the device is in a low power state during probe or remove. + */ +bool acpi_dev_low_power_state_probe(struct device *dev) +{ + int power_state; + int ret; + + if (!is_acpi_device_node(dev_fwnode(dev))) + return false; + + ret = acpi_device_get_power(ACPI_COMPANION(dev), &power_state); + if (ret) { + dev_warn(dev, "Cannot obtain power state (%d)\n", ret); + return false; + } + + return power_state != ACPI_STATE_D0; +} +EXPORT_SYMBOL_GPL(acpi_dev_low_power_state_probe); + #endif /* CONFIG_PM */ diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 0f37a7d5fa774..fd00853074e1a 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -926,6 +926,7 @@ int acpi_dev_resume(struct device *dev); int acpi_subsys_runtime_suspend(struct device *dev); int acpi_subsys_runtime_resume(struct device *dev); int acpi_dev_pm_attach(struct device *dev, bool power_on); +bool acpi_dev_low_power_state_probe(struct device *dev); #else static inline int acpi_dev_runtime_suspend(struct device *dev) { return 0; } static inline int acpi_dev_runtime_resume(struct device *dev) { return 0; } @@ -935,6 +936,10 @@ static inline int acpi_dev_pm_attach(struct device *dev, bool power_on) { return 0; } +static inline bool acpi_dev_low_power_state_probe(struct device *dev) +{ + return false; +} #endif #if defined(CONFIG_ACPI) && defined(CONFIG_PM_SLEEP) From patchwork Thu Jan 9 15:45:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 1220480 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47tr5y3pp7z9sRf for ; Fri, 10 Jan 2020 02:44:54 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732547AbgAIPow (ORCPT ); Thu, 9 Jan 2020 10:44:52 -0500 Received: from mga04.intel.com ([192.55.52.120]:31989 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732509AbgAIPoi (ORCPT ); Thu, 9 Jan 2020 10:44:38 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:37 -0800 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="218395583" Received: from paasikivi.fi.intel.com ([10.237.72.42]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:35 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id 1D7A320EC8; Thu, 9 Jan 2020 17:44:33 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.92) (envelope-from ) id 1ipa01-00055B-Ew; Thu, 09 Jan 2020 17:45:29 +0200 From: Sakari Ailus To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rajmohan.mani@intel.com, Tomasz Figa Subject: [PATCH v3 3/5] ov5670: Support probe whilst the device is in a low power state Date: Thu, 9 Jan 2020 17:45:27 +0200 Message-Id: <20200109154529.19484-4-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200109154529.19484-1-sakari.ailus@linux.intel.com> References: <20200109154529.19484-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Tell ACPI device PM code that the driver supports the device being in a low power state when the driver's probe function is entered. Signed-off-by: Sakari Ailus --- drivers/media/i2c/ov5670.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/ov5670.c b/drivers/media/i2c/ov5670.c index 041fcbb4eebdf..9b10b1c0e1f8f 100644 --- a/drivers/media/i2c/ov5670.c +++ b/drivers/media/i2c/ov5670.c @@ -2444,6 +2444,7 @@ static int ov5670_probe(struct i2c_client *client) struct ov5670 *ov5670; const char *err_msg; u32 input_clk = 0; + bool low_power; int ret; device_property_read_u32(&client->dev, "clock-frequency", &input_clk); @@ -2460,11 +2461,14 @@ static int ov5670_probe(struct i2c_client *client) /* Initialize subdev */ v4l2_i2c_subdev_init(&ov5670->sd, client, &ov5670_subdev_ops); - /* Check module identity */ - ret = ov5670_identify_module(ov5670); - if (ret) { - err_msg = "ov5670_identify_module() error"; - goto error_print; + low_power = acpi_dev_low_power_state_probe(&client->dev); + if (!low_power) { + /* Check module identity */ + ret = ov5670_identify_module(ov5670); + if (ret) { + err_msg = "ov5670_identify_module() error"; + goto error_print; + } } mutex_init(&ov5670->mutex); @@ -2501,10 +2505,10 @@ static int ov5670_probe(struct i2c_client *client) ov5670->streaming = false; /* - * Device is already turned on by i2c-core with ACPI domain PM. - * Enable runtime PM and turn off the device. + * Don't set the device's state to active if it's in a low power state. */ - pm_runtime_set_active(&client->dev); + if (!low_power) + pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); pm_runtime_idle(&client->dev); @@ -2546,7 +2550,7 @@ static const struct dev_pm_ops ov5670_pm_ops = { #ifdef CONFIG_ACPI static const struct acpi_device_id ov5670_acpi_ids[] = { - {"INT3479"}, + { "INT3479" }, { /* sentinel */ } }; @@ -2561,6 +2565,7 @@ static struct i2c_driver ov5670_i2c_driver = { }, .probe_new = ov5670_probe, .remove = ov5670_remove, + .probe_low_power = true, }; module_i2c_driver(ov5670_i2c_driver); From patchwork Thu Jan 9 15:45:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 1220479 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47tr5x5CC0z9sRk for ; Fri, 10 Jan 2020 02:44:53 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732549AbgAIPoi (ORCPT ); Thu, 9 Jan 2020 10:44:38 -0500 Received: from mga09.intel.com ([134.134.136.24]:4559 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730913AbgAIPoi (ORCPT ); Thu, 9 Jan 2020 10:44:38 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:37 -0800 X-IronPort-AV: E=Sophos;i="5.69,414,1571727600"; d="scan'208";a="246707087" Received: from paasikivi.fi.intel.com ([10.237.72.42]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jan 2020 07:44:35 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id 2407420F35; Thu, 9 Jan 2020 17:44:33 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.92) (envelope-from ) id 1ipa01-00055E-G9; Thu, 09 Jan 2020 17:45:29 +0200 From: Sakari Ailus To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rajmohan.mani@intel.com, Tomasz Figa Subject: [PATCH v3 4/5] media: i2c: imx319: Support probe while the device is off Date: Thu, 9 Jan 2020 17:45:28 +0200 Message-Id: <20200109154529.19484-5-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200109154529.19484-1-sakari.ailus@linux.intel.com> References: <20200109154529.19484-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Rajmohan Mani Tell ACPI device PM code that the driver supports the device being powered off when the driver's probe function is entered. Signed-off-by: Rajmohan Mani Signed-off-by: Sakari Ailus --- drivers/media/i2c/imx319.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/imx319.c b/drivers/media/i2c/imx319.c index 17c2e4b41221e..3bb87154dd2cd 100644 --- a/drivers/media/i2c/imx319.c +++ b/drivers/media/i2c/imx319.c @@ -2424,6 +2424,7 @@ static struct imx319_hwcfg *imx319_get_hwcfg(struct device *dev) static int imx319_probe(struct i2c_client *client) { struct imx319 *imx319; + bool low_power; int ret; u32 i; @@ -2436,11 +2437,14 @@ static int imx319_probe(struct i2c_client *client) /* Initialize subdev */ v4l2_i2c_subdev_init(&imx319->sd, client, &imx319_subdev_ops); - /* Check module identity */ - ret = imx319_identify_module(imx319); - if (ret) { - dev_err(&client->dev, "failed to find sensor: %d", ret); - goto error_probe; + low_power = acpi_dev_low_power_state_probe(&client->dev); + if (!low_power) { + /* Check module identity */ + ret = imx319_identify_module(imx319); + if (ret) { + dev_err(&client->dev, "failed to find sensor: %d", ret); + goto error_probe; + } } imx319->hwcfg = imx319_get_hwcfg(&client->dev); @@ -2493,10 +2497,10 @@ static int imx319_probe(struct i2c_client *client) goto error_media_entity; /* - * Device is already turned on by i2c-core with ACPI domain PM. - * Enable runtime PM and turn off the device. + * Don't set the device's state to active if it's in a low power state. */ - pm_runtime_set_active(&client->dev); + if (!low_power) + pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); pm_runtime_idle(&client->dev); @@ -2536,7 +2540,7 @@ static const struct dev_pm_ops imx319_pm_ops = { }; static const struct acpi_device_id imx319_acpi_ids[] = { - { "SONY319A" }, + { "SONY319A", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(acpi, imx319_acpi_ids); @@ -2549,6 +2553,7 @@ static struct i2c_driver imx319_i2c_driver = { }, .probe_new = imx319_probe, .remove = imx319_remove, + .probe_low_power = true, }; module_i2c_driver(imx319_i2c_driver);