From patchwork Thu Mar 17 22:30:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Packham X-Patchwork-Id: 552303 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3956FC43217 for ; Thu, 17 Mar 2022 22:31:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229845AbiCQWcW (ORCPT ); Thu, 17 Mar 2022 18:32:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229816AbiCQWcT (ORCPT ); Thu, 17 Mar 2022 18:32:19 -0400 Received: from gate2.alliedtelesis.co.nz (gate2.alliedtelesis.co.nz [202.36.163.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51DC8180065 for ; Thu, 17 Mar 2022 15:31:01 -0700 (PDT) Received: from svr-chch-seg1.atlnz.lc (mmarshal3.atlnz.lc [10.32.18.43]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by gate2.alliedtelesis.co.nz (Postfix) with ESMTPS id E59D62C0851; Thu, 17 Mar 2022 22:30:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1647556259; bh=xoqzMpiZ/zfpU5hHFDSo09vL8SqsDvZiM5uWIRZaC5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RcD/h0d6r7KgnBuh8bM/D5E60OsIk6jSt7L6DmSHkFGfjVR8t8Kj60W/3WJPfofOQ 2/2XGaO9GCGjDQVXlXYqZVzAyoqp8SHRA8ytkdOsNH9HUs7BU6Ka8fGGzjNjuGtCOw Esva2fcN+04LdejMYp8m7lkGdVTuBg0tQypc+bwp9DCOvytNqQTg60DVF3SNU52Zf6 uhPTEwz862j05fbhxXAeweiPPCD0EGjPAAwLjxPy8nNdJy8kzIA+yh+3qJdTE/1k2q rGMCit0Mjz2Q7mYtduvEa2PZsPgQosgWT46Q8yKzNMSeKr9dB/SKLDxYBU0nQyAbdt NAy4xw4Zvgk+Q== Received: from pat.atlnz.lc (Not Verified[10.32.16.33]) by svr-chch-seg1.atlnz.lc with Trustwave SEG (v8,2,6,11305) id ; Fri, 18 Mar 2022 11:30:59 +1300 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id A462613EE43; Fri, 18 Mar 2022 11:30:59 +1300 (NZDT) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id A5D9D2A004D; Fri, 18 Mar 2022 11:30:56 +1300 (NZDT) From: Chris Packham To: jdelvare@suse.com, linux@roeck-us.net, robh+dt@kernel.org Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Chris Packham Subject: [PATCH v2 2/3] hwmon: (adt7475) Add support for pin configuration Date: Fri, 18 Mar 2022 11:30:49 +1300 Message-Id: <20220317223051.1227110-3-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220317223051.1227110-1-chris.packham@alliedtelesis.co.nz> References: <20220317223051.1227110-1-chris.packham@alliedtelesis.co.nz> MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.3 cv=Cfh2G4jl c=1 sm=1 tr=0 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=o8Y5sQTvuykA:10 a=cFeUy8Ca9zMUrnV-lPcA:9 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The adt7473, adt7475, adt7476 and adt7490 have pins that can be used for different functions. On the adt7473 and adt7475 this is pins 5 and 9. On the adt7476 and adt7490 this is pins 10 and 14. The first pin can either be PWM2(default) or SMBALERT#. The second pin can be TACH4(default), THERM#, SMBALERT# or GPIO. The adt7475 driver has always been able to detect the configuration if it had been done by an earlier boot stage. Add support for configuring the pins based on the hardware description in the device tree. Signed-off-by: Chris Packham --- Notes: Changes in v2: - Use load_config{3,4} instead of load_pin{10,14}_config - Handle errors from adt7475_read() - Remove obsolete check on chip type - Use enum chips instead of int - Update error messages drivers/hwmon/adt7475.c | 96 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 9d5b019651f2..6de501de41b2 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -112,6 +112,8 @@ #define CONFIG3_THERM 0x02 #define CONFIG4_PINFUNC 0x03 +#define CONFIG4_THERM 0x01 +#define CONFIG4_SMBALERT 0x02 #define CONFIG4_MAXDUTY 0x08 #define CONFIG4_ATTN_IN10 0x30 #define CONFIG4_ATTN_IN43 0xC0 @@ -1460,6 +1462,96 @@ static int adt7475_update_limits(struct i2c_client *client) return 0; } +static int load_config3(const struct i2c_client *client, const char *propname) +{ + const char *function; + u8 config3; + int ret; + + ret = of_property_read_string(client->dev.of_node, propname, &function); + if (!ret) { + ret = adt7475_read(REG_CONFIG3); + if (ret < 0) + return ret; + + config3 = ret & ~CONFIG3_SMBALERT; + if (!strcmp("pwm2", function)) + ; + else if (!strcmp("smbalert#", function)) + config3 |= CONFIG3_SMBALERT; + else + return -EINVAL; + + return i2c_smbus_write_byte_data(client, REG_CONFIG3, config3); + } + + return 0; +} + +static int load_config4(const struct i2c_client *client, const char *propname) +{ + const char *function; + u8 config4; + int ret; + + ret = of_property_read_string(client->dev.of_node, propname, &function); + if (!ret) { + ret = adt7475_read(REG_CONFIG4); + if (ret < 0) + return ret; + + config4 = ret & ~CONFIG4_PINFUNC; + + if (!strcmp("tach4", function)) + ; + else if (!strcmp("therm#", function)) + config4 |= CONFIG4_THERM; + else if (!strcmp("smbalert#", function)) + config4 |= CONFIG4_SMBALERT; + else if (!strcmp("gpio", function)) + config4 |= CONFIG4_PINFUNC; + else + return -EINVAL; + + return i2c_smbus_write_byte_data(client, REG_CONFIG4, config4); + } + + return 0; +} + +static int load_config(const struct i2c_client *client, enum chips chip) +{ + int err; + const char *prop1, *prop2; + + switch (chip) { + case adt7473: + case adt7475: + prop1 = "adi,pin5-function"; + prop2 = "adi,pin9-function"; + break; + case adt7476: + case adt7490: + prop1 = "adi,pin10-function"; + prop2 = "adi,pin14-function"; + break; + } + + err = load_config3(client, prop1); + if (err) { + dev_err(&client->dev, "failed to configure %s\n", prop1); + return err; + } + + err = load_config4(client, prop2); + if (err) { + dev_err(&client->dev, "failed to configure %s\n", prop2); + return err; + } + + return 0; +} + static int set_property_bit(const struct i2c_client *client, char *property, u8 *config, u8 bit_index) { @@ -1585,6 +1677,10 @@ static int adt7475_probe(struct i2c_client *client) revision = adt7475_read(REG_DEVID2) & 0x07; } + ret = load_config(client, chip); + if (ret) + return ret; + config3 = adt7475_read(REG_CONFIG3); /* Pin PWM2 may alternatively be used for ALERT output */ if (!(config3 & CONFIG3_SMBALERT))