From patchwork Tue Sep 25 22:59:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 10614911 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DCE0616B1 for ; Tue, 25 Sep 2018 23:00:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CDB4C2ADF6 for ; Tue, 25 Sep 2018 23:00:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C14F82AE00; Tue, 25 Sep 2018 23:00:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61AB72ADF6 for ; Tue, 25 Sep 2018 23:00:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726259AbeIZFJn (ORCPT ); Wed, 26 Sep 2018 01:09:43 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:45119 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725999AbeIZFJm (ORCPT ); Wed, 26 Sep 2018 01:09:42 -0400 Received: by mail-pf1-f196.google.com with SMTP id a23-v6so4547787pfi.12; Tue, 25 Sep 2018 15:59:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=hL162RkExEcLg9Z+BbmT3Ey+Hhsqgktqno5vtgKw68E=; b=TLI795JVq6orQTiHJTZSUk1WDFFrt55+3qvytTcTeuoo7h5bY8UvvSfk7OHIHa4HGd JTgenpLrDJxNXLS3orP374tWwUC5pvKQSq4H5WbDNtecIXRW9Dc7O5Xzl6GOxptCWBs0 /1BbciHi1jEaE5iagE59f8+9kRnHYvwJ7yNrWuky5izMYNl9xNwwehrss9KZAT4W6dX9 3IF38WifMK4Kdkz5B0ygLCHYotOdwcV2BIkMw/JBdUuUCmht0tLeiNm4pgGi5A3edWEh hQLyUiVd34Sb/GFsI51xnMmMG419L2Vyed+Ox9Lg4RqkR9tW8XEBcsGP7UFyUKvFNQC+ NlTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hL162RkExEcLg9Z+BbmT3Ey+Hhsqgktqno5vtgKw68E=; b=YzURbUxaTxghMhAYM6BpcC3GGQfAMJoVLdgOivL9Gyv/OOa6c91TomRB7YGjgsEYxk 2kZ3mqSfTbHZrHYLEWHynTMnbIFfS38C9lpNXrM2qHHYEEA/3K29oDJpJHXRovt30R9y KbtuPFcfhGqpebcERtWHl1j8rLjxmvB7BJ5IZtkKsG3jFBGIyot8O/rsxJro3TvXf+99 +kNpkNizpjBlk7WW4i74d/yccxDrdgt1jvmhoHyohj4OB/CcpfaJXPWN3F3FEwq2eC5l 2JLvzplpo+2eLNC2hrWAQaUnvpBsjNri4IUyw+DfTBOWwMIjOJROThA6qw3C/8u6yyDb wQgw== X-Gm-Message-State: ABuFfojIGAdwFYfLUphw/wxMmngF7s/2pZUa22AcYofI+VF3ByZ3znD6 8GXs/WnChf1dH+4H8tIEpxo= X-Google-Smtp-Source: ACcGV61zyBLcZHf//kNvVQZCexlS4Dtt2f2+rQyPEgSxvXwXDmOvX/x6XgvPOk4x24VG/2op7rM9Ig== X-Received: by 2002:a63:c4f:: with SMTP id 15-v6mr2983098pgm.155.1537916391915; Tue, 25 Sep 2018 15:59:51 -0700 (PDT) Received: from Asurada-Nvidia.nvidia.com (thunderhill.nvidia.com. [216.228.112.22]) by smtp.gmail.com with ESMTPSA id n22-v6sm4652579pfi.185.2018.09.25.15.59.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Sep 2018 15:59:51 -0700 (PDT) From: Nicolin Chen To: jdelvare@suse.com, linux@roeck-us.net, robh+dt@kernel.org, mark.rutland@arm.com, corbet@lwn.net Cc: afd@ti.com, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v5 1/2] dt-bindings: hwmon: Add ina3221 documentation Date: Tue, 25 Sep 2018 15:59:29 -0700 Message-Id: <20180925225930.31886-2-nicoleotsuka@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180925225930.31886-1-nicoleotsuka@gmail.com> References: <20180925225930.31886-1-nicoleotsuka@gmail.com> Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Texas Instruments INA3221 is a triple-channel shunt and bus voltage monitor. This patch adds a DT binding doc for it. Signed-off-by: Nicolin Chen --- Changelog v4->v5: * Replaced "input-id" with "reg" and added address-cells and size-cells * Replaced "input-label" with "label" * Replaced "shunt-resistor" with "shunt-resistor-micro-ohms" v3->v4: * Removed the attempt of putting labels in the node names * Added a new optional label property in the child node * Updated examples accordingly v2->v3: * Added a simple subject in the line 1 * Fixed the shunt resistor value in the example v1->v2: * Dropped channel name properties * Added child node definitions. * * Added shunt resistor property in the child node * * Added status property to indicate connection status * * Changed to use child node name as the label of input source .../devicetree/bindings/hwmon/ina3221.txt | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/ina3221.txt diff --git a/Documentation/devicetree/bindings/hwmon/ina3221.txt b/Documentation/devicetree/bindings/hwmon/ina3221.txt new file mode 100644 index 000000000000..e17a897f4803 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/ina3221.txt @@ -0,0 +1,49 @@ +Texas Instruments INA3221 Device Tree Bindings + +1) ina3221 node + Required properties: + - compatible: Must be "ti,ina3221" + - reg: I2C address + + Optional properties: + = The node contains optional child nodes for three channels = + = Each child node describes the information of input source = + + - #address-cells: Required only if a child node is present. Must be 1. + - #size-cells: Required only if a child node is present. Must be 0. + + Example: + + ina3221@40 { + compatible = "ti,ina3221"; + reg = <0x40>; + #address-cells = <1>; + #size-cells = <0>; + + [ child node definitions... ] + }; + +2) child nodes + Required properties: + - reg: Must be 0, 1 or 2, corresponding to IN1, IN2 or IN3 port of INA3221 + + Optional properties: + - label: Name of the input source + - shunt-resistor-micro-ohms: Shunt resistor value in micro-Ohm + - status: Should be "disabled" if no input source + + Example: + + input@0 { + reg = <0x0>; + status = "disabled"; + }; + input@1 { + reg = <0x1>; + shunt-resistor-micro-ohms = <5000>; + }; + input@2 { + reg = <0x2>; + label = "VDD_5V"; + shunt-resistor-micro-ohms = <5000>; + }; From patchwork Tue Sep 25 22:59:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 10614913 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7D15313A4 for ; Tue, 25 Sep 2018 23:00:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6C3502ADFB for ; Tue, 25 Sep 2018 23:00:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5F5412AE00; Tue, 25 Sep 2018 23:00:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 899FB2ADFB for ; Tue, 25 Sep 2018 23:00:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725999AbeIZFJo (ORCPT ); Wed, 26 Sep 2018 01:09:44 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:38705 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726253AbeIZFJn (ORCPT ); Wed, 26 Sep 2018 01:09:43 -0400 Received: by mail-pg1-f193.google.com with SMTP id r77-v6so7510525pgr.5; Tue, 25 Sep 2018 15:59:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=5nvYOg4sYKsU0jHqgpHmvzOLT5FCsfhCxBJx1jWVsWE=; b=QDVO7KR2DqcKbALvViMWnnPF7dBQPMDYJBuHYWFdjnhGGOlZ1l7aAgG8xQcQCGEQUQ tzVG3W7yojoF2bNr71lXE7ZSfWXsQsBWZ5VltTZ7i8cErI3qhgVgWYO8p6uiopEAPbMX 3WMHDZyowSH/sljT7SkfEC0i5AhoE2JLX6INkrmGGYuXcmm9UPnROQ1iF2itr/X6yvS6 iWYdxqtqQj6mi4d+JGVUxIazpqml6hjUmnWQEDOwP20qaNth2R7/CUpcovp7GBoX6dRD +CnPW+WjIsQd8zeWeFJ2bNZjHDGt47ywEm2Q27BDhCYP1LB6vKKfEw5HBneYKbm8JpnF YC7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=5nvYOg4sYKsU0jHqgpHmvzOLT5FCsfhCxBJx1jWVsWE=; b=OnsL8eMXgn232U3QSJ8mIKPv/mXOwBOh6ikFP2sYCpu8mo6YXPdsDTHRdO+ItQPKDr 96ib8S+k4HgEtnvvHmAOZPHMDSFd4+gdnwBjoq8nOqAL0Qry8n6fXfL5XT4Z9/BBQ6C9 vK/ZmpHg4mGwzQyE7zen3S8EilGXuWA5E3zXu8D2G7eUdJALqrDeszmYTrTtqu9DhqSm 6+Rn6Y9aRwWKemPwdfUnmWbw2Il4EAHap3a5CiNsxLSvPbLfRaajUtj0RuQEa4U9wW3Z dPU8WmSqh+TyszCvOUWaYawnMpIasWIlGLl6AA0xVFsjznvXIMCrKk2cTnzSJgptj9OI +PVQ== X-Gm-Message-State: ABuFfoi56iWN9LIZ0wDTIcoUnP0zPZc0AMV0vZy/R3juS/CPZz3/IJGb R/FPNmvVSRvmMogjr6kKMTg= X-Google-Smtp-Source: ACcGV62kdiSFrybej+Iu7bfersgffK+pstbcxmb/7puh5fnD+DW059bX6i68PB9ocDeahYA26aBwcQ== X-Received: by 2002:a63:fc46:: with SMTP id r6-v6mr2956073pgk.345.1537916393031; Tue, 25 Sep 2018 15:59:53 -0700 (PDT) Received: from Asurada-Nvidia.nvidia.com (thunderhill.nvidia.com. [216.228.112.22]) by smtp.gmail.com with ESMTPSA id n22-v6sm4652579pfi.185.2018.09.25.15.59.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Sep 2018 15:59:52 -0700 (PDT) From: Nicolin Chen To: jdelvare@suse.com, linux@roeck-us.net, robh+dt@kernel.org, mark.rutland@arm.com, corbet@lwn.net Cc: afd@ti.com, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v5 2/2] hwmon: ina3221: Read channel input source info from DT Date: Tue, 25 Sep 2018 15:59:30 -0700 Message-Id: <20180925225930.31886-3-nicoleotsuka@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180925225930.31886-1-nicoleotsuka@gmail.com> References: <20180925225930.31886-1-nicoleotsuka@gmail.com> Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP An ina3221 chip has three input ports. Each port is used to measure the voltage and current of its input source. The DT binding now has defined bindings for their input sources, so the driver should read these information and handle accordingly. This patch adds a new structure of input source specific information including input source label, shunt resistor value and its connection status. It exposes these labels via sysfs if available and also disables those channels where there's no input source being connected. Signed-off-by: Nicolin Chen --- Changelog v4->v5: * Replaced "shunt-resistor" with "shunt-resistor-micro-ohms" * Replaced "input-label" with "label" * Replaced "input-id" with "reg" * Simplified is_visible() by using index of the attr * Moved inX_label to index-0 and added comments for safety v3->v4: * Added is_visible callback function to hide sysfs nodes v2->v3: * N/A v1->v2: * Added a structure for input source corresponding to DT bindings * Moved shunt resistor value to the structure * Defined in[123]_label sysfs nodes instead of name[123]_input * Updated probe() function to get information from DT * Updated ina3221 hwmon documentation for the labels * Dropped dynamical group definition to keep all groups as they were * * Will send an incremental patch later apart from this DT binding series Documentation/hwmon/ina3221 | 1 + drivers/hwmon/ina3221.c | 161 ++++++++++++++++++++++++++++++++---- 2 files changed, 148 insertions(+), 14 deletions(-) diff --git a/Documentation/hwmon/ina3221 b/Documentation/hwmon/ina3221 index 0ff74854cb2e..2726038be5bd 100644 --- a/Documentation/hwmon/ina3221 +++ b/Documentation/hwmon/ina3221 @@ -22,6 +22,7 @@ Sysfs entries ------------- in[123]_input Bus voltage(mV) channels +in[123]_label Voltage channel labels curr[123]_input Current(mA) measurement channels shunt[123]_resistor Shunt resistance(uOhm) channels curr[123]_crit Critical alert current(mA) setting, activates the diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c index e6b49500c52a..25fa8c05a3bf 100644 --- a/drivers/hwmon/ina3221.c +++ b/drivers/hwmon/ina3221.c @@ -41,6 +41,7 @@ #define INA3221_CONFIG_MODE_SHUNT BIT(1) #define INA3221_CONFIG_MODE_BUS BIT(2) #define INA3221_CONFIG_MODE_CONTINUOUS BIT(3) +#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x)) #define INA3221_RSHUNT_DEFAULT 10000 @@ -86,18 +87,41 @@ static const unsigned int register_channel[] = { [INA3221_WARN3] = INA3221_CHANNEL3, }; +/** + * struct ina3221_input - channel input source specific information + * @label: label of channel input source + * @shunt_resistor: shunt resistor value of channel input source + * @disconnected: connection status of channel input source + */ +struct ina3221_input { + const char *label; + int shunt_resistor; + bool disconnected; +}; + /** * struct ina3221_data - device specific information * @regmap: Register map of the device * @fields: Register fields of the device - * @shunt_resistors: Array of resistor values per channel + * @inputs: Array of channel input source specific structures */ struct ina3221_data { struct regmap *regmap; struct regmap_field *fields[F_MAX_FIELDS]; - int shunt_resistors[INA3221_NUM_CHANNELS]; + struct ina3221_input inputs[INA3221_NUM_CHANNELS]; }; +static ssize_t ina3221_show_label(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int channel = sd_attr->index; + struct ina3221_input *input = &ina->inputs[channel]; + + return snprintf(buf, PAGE_SIZE, "%s\n", input->label); +} + static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, int *val) { @@ -155,7 +179,8 @@ static ssize_t ina3221_show_current(struct device *dev, struct ina3221_data *ina = dev_get_drvdata(dev); unsigned int reg = sd_attr->index; unsigned int channel = register_channel[reg]; - int resistance_uo = ina->shunt_resistors[channel]; + struct ina3221_input *input = &ina->inputs[channel]; + int resistance_uo = input->shunt_resistor; int val, current_ma, voltage_nv, ret; ret = ina3221_read_value(ina, reg, &val); @@ -176,7 +201,8 @@ static ssize_t ina3221_set_current(struct device *dev, struct ina3221_data *ina = dev_get_drvdata(dev); unsigned int reg = sd_attr->index; unsigned int channel = register_channel[reg]; - int resistance_uo = ina->shunt_resistors[channel]; + struct ina3221_input *input = &ina->inputs[channel]; + int resistance_uo = input->shunt_resistor; int val, current_ma, voltage_uv, ret; ret = kstrtoint(buf, 0, ¤t_ma); @@ -209,11 +235,9 @@ static ssize_t ina3221_show_shunt(struct device *dev, struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); struct ina3221_data *ina = dev_get_drvdata(dev); unsigned int channel = sd_attr->index; - unsigned int resistance_uo; - - resistance_uo = ina->shunt_resistors[channel]; + struct ina3221_input *input = &ina->inputs[channel]; - return snprintf(buf, PAGE_SIZE, "%d\n", resistance_uo); + return snprintf(buf, PAGE_SIZE, "%d\n", input->shunt_resistor); } static ssize_t ina3221_set_shunt(struct device *dev, @@ -223,6 +247,7 @@ static ssize_t ina3221_set_shunt(struct device *dev, struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); struct ina3221_data *ina = dev_get_drvdata(dev); unsigned int channel = sd_attr->index; + struct ina3221_input *input = &ina->inputs[channel]; int val; int ret; @@ -232,7 +257,7 @@ static ssize_t ina3221_set_shunt(struct device *dev, val = clamp_val(val, 1, INT_MAX); - ina->shunt_resistors[channel] = val; + input->shunt_resistor = val; return count; } @@ -253,6 +278,14 @@ static ssize_t ina3221_show_alert(struct device *dev, return snprintf(buf, PAGE_SIZE, "%d\n", regval); } +/* input channel label */ +static SENSOR_DEVICE_ATTR(in1_label, 0444, + ina3221_show_label, NULL, INA3221_CHANNEL1); +static SENSOR_DEVICE_ATTR(in2_label, 0444, + ina3221_show_label, NULL, INA3221_CHANNEL2); +static SENSOR_DEVICE_ATTR(in3_label, 0444, + ina3221_show_label, NULL, INA3221_CHANNEL3); + /* bus voltage */ static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina3221_show_bus_voltage, NULL, INA3221_BUS1); @@ -318,7 +351,8 @@ static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3); static struct attribute *ina3221_attrs[] = { - /* channel 1 */ + /* channel 1 -- make sure label at first */ + &sensor_dev_attr_in1_label.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_curr1_input.dev_attr.attr, &sensor_dev_attr_shunt1_resistor.dev_attr.attr, @@ -328,7 +362,8 @@ static struct attribute *ina3221_attrs[] = { &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, - /* channel 2 */ + /* channel 2 -- make sure label at first */ + &sensor_dev_attr_in2_label.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_curr2_input.dev_attr.attr, &sensor_dev_attr_shunt2_resistor.dev_attr.attr, @@ -338,7 +373,8 @@ static struct attribute *ina3221_attrs[] = { &sensor_dev_attr_curr2_max_alarm.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, - /* channel 3 */ + /* channel 3 -- make sure label at first */ + &sensor_dev_attr_in3_label.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_curr3_input.dev_attr.attr, &sensor_dev_attr_shunt3_resistor.dev_attr.attr, @@ -350,7 +386,34 @@ static struct attribute *ina3221_attrs[] = { NULL, }; -ATTRIBUTE_GROUPS(ina3221); + +static umode_t ina3221_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + const int max_attrs = ARRAY_SIZE(ina3221_attrs) - 1; + const int num_attrs = max_attrs / INA3221_NUM_CHANNELS; + struct device *dev = kobj_to_dev(kobj); + struct ina3221_data *ina = dev_get_drvdata(dev); + enum ina3221_channels channel = n / num_attrs; + struct ina3221_input *input = &ina->inputs[channel]; + int index = n % num_attrs; + + /* Hide if channel input source is disconnected */ + if (input->disconnected) + return 0; + + /* Hide label node if label is not provided */ + if (index == 0 && !input->label) + return 0; + + return attr->mode; +} + +static const struct attribute_group ina3221_group = { + .is_visible = ina3221_attr_is_visible, + .attrs = ina3221_attrs, +}; +__ATTRIBUTE_GROUPS(ina3221); static const struct regmap_range ina3221_yes_ranges[] = { regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3), @@ -370,6 +433,60 @@ static const struct regmap_config ina3221_regmap_config = { .volatile_table = &ina3221_volatile_table, }; +static int ina3221_probe_child_from_dt(struct device *dev, + struct device_node *child, + struct ina3221_data *ina) +{ + struct ina3221_input *input; + u32 val; + int ret; + + ret = of_property_read_u32(child, "reg", &val); + if (ret) { + dev_err(dev, "missing reg property of %s\n", child->name); + return ret; + } else if (val > INA3221_CHANNEL3) { + dev_err(dev, "invalid reg %d of %s\n", val, child->name); + return ret; + } + + input = &ina->inputs[val]; + + /* Log the disconnected channel input */ + if (!of_device_is_available(child)) { + input->disconnected = true; + return 0; + } + + /* Save the connected input label if available */ + of_property_read_string(child, "label", &input->label); + + /* Overwrite default shunt resistor value optionally */ + if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) + input->shunt_resistor = val; + + return 0; +} + +static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina) +{ + const struct device_node *np = dev->of_node; + struct device_node *child; + int ret; + + /* Compatible with non-DT platforms */ + if (!np) + return 0; + + for_each_child_of_node(np, child) { + ret = ina3221_probe_child_from_dt(dev, child, ina); + if (ret) + return ret; + } + + return 0; +} + static int ina3221_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -377,6 +494,7 @@ static int ina3221_probe(struct i2c_client *client, struct ina3221_data *ina; struct device *hwmon_dev; int i, ret; + u16 mask; ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL); if (!ina) @@ -399,7 +517,13 @@ static int ina3221_probe(struct i2c_client *client, } for (i = 0; i < INA3221_NUM_CHANNELS; i++) - ina->shunt_resistors[i] = INA3221_RSHUNT_DEFAULT; + ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT; + + ret = ina3221_probe_from_dt(dev, ina); + if (ret) { + dev_err(dev, "Unable to probe from device treee\n"); + return ret; + } ret = regmap_field_write(ina->fields[F_RST], true); if (ret) { @@ -407,6 +531,15 @@ static int ina3221_probe(struct i2c_client *client, return ret; } + /* Disable channels if their inputs are disconnected */ + for (i = 0, mask = 0; i < INA3221_NUM_CHANNELS; i++) { + if (ina->inputs[i].disconnected) + mask |= INA3221_CONFIG_CHx_EN(i); + } + ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, 0); + if (ret) + return ret; + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, ina, ina3221_groups);