From patchwork Wed Jun 27 18:12:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Ranostay X-Patchwork-Id: 10492353 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5F93E60230 for ; Wed, 27 Jun 2018 18:12:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7D1602978B for ; Wed, 27 Jun 2018 18:12:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 705EF2977E; Wed, 27 Jun 2018 18:12:49 +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,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable 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 12CF62977E for ; Wed, 27 Jun 2018 18:12:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965251AbeF0SMr (ORCPT ); Wed, 27 Jun 2018 14:12:47 -0400 Received: from mail-pl0-f65.google.com ([209.85.160.65]:41176 "EHLO mail-pl0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965068AbeF0SMq (ORCPT ); Wed, 27 Jun 2018 14:12:46 -0400 Received: by mail-pl0-f65.google.com with SMTP id w8-v6so1423800ply.8 for ; Wed, 27 Jun 2018 11:12:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=konsulko.com; s=google; h=from:to:cc:subject:date:message-id; bh=mJN3SvEQadEbW/xegtC2tO+g+eLtODXU7dwWKJ7JUQU=; b=jlDDNrIZjzgsPRwkcHU6ZjSw+QfEwqZvIxfXcRrLuUbJ8XTgKRvsOTmPgnDm0stHkD MLkvEHRSMSNyw/n/nfLMxbOhuo9yCFsBw+Gvt4jXd7qk0NJphbTj8UirArJQZ1Xg2xbw kss3Hcz0tjmm2DEqTyJDyLfx75H28yBy532zU= 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; bh=mJN3SvEQadEbW/xegtC2tO+g+eLtODXU7dwWKJ7JUQU=; b=FT6+SJTpYaYjpikNALP92NY6AHzfCc98u2p4ibU1AAHm0bAGfZmHMtzRWCBb/9bDwT Lb/RwWClFvoQtbLvqNFnaAEpCdfOwI0Xwoz9+h2D5YvMk7fJhqMFlL+49va5ittqAx7V Zlys7szbVxEHppNcAaK4t8+wiid8+3MUFeigXkJ5hqIRWTzSlsoGkvzdzOsGPEqXLEc1 JYK/0RL0pZ/lmaDcGP41a9nMLPOztI92k0y7MwxGcDcCna9RbJ/Ga6ztfDkU9xrIRy/V S4BiZ3vwdngJVDATy/UXS/YGoJ3eRKYWIY7eSom1p4B8NkYFRPIwlsR7RiQbFlJt9ZZb vn8g== X-Gm-Message-State: APt69E1W7V5HnzMwxPM8oYviHfnHdvgdw1ZyId7RRPr4FxvhgKqio4YI 0nLJyUU4cMMG98T+835HmSOqLKjPy/0= X-Google-Smtp-Source: ADUXVKLUV0nx+vVHqUAzxcrow7NKxPVC65I7+95OILh/vWR4fkJLxPVBOJuYhNgUtPbVitCC8PU0Ig== X-Received: by 2002:a17:902:e00a:: with SMTP id ca10-v6mr7194557plb.224.1530123166136; Wed, 27 Jun 2018 11:12:46 -0700 (PDT) Received: from niteshade.hsd1.or.comcast.net ([2601:1c2:5000:8d45::3f0e]) by smtp.gmail.com with ESMTPSA id r26-v6sm18150384pfj.180.2018.06.27.11.12.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Jun 2018 11:12:45 -0700 (PDT) From: Matt Ranostay To: linux-media@vger.kernel.org Cc: Matt Ranostay , linux-hwmon@vger.kernel.org Subject: [PATCH v3] media: video-i2c: add hwmon support for amg88xx Date: Wed, 27 Jun 2018 11:12:43 -0700 Message-Id: <20180627181243.14630-1-matt.ranostay@konsulko.com> X-Mailer: git-send-email 2.17.1 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP AMG88xx has an on-board thermistor which is used for more accurate processing of its temperature readings from the 8x8 thermopile array Cc: linux-hwmon@vger.kernel.org Signed-off-by: Matt Ranostay Acked-by: Guenter Roeck --- drivers/media/i2c/video-i2c.c | 81 +++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) Changes from v1: * remove unneeded include statement * removed evil &NULL dereference if hwmon isn't enabled * return PTR_ERR instead of boolean IS_ERR from amg88xx_hwmon_init() * use error code returned from hwmon_init() to display dev_warn Changes from v2: * change #ifdef check to use cleaner IS_ENABLED(CONFIG_HWMON) * document why the temperature value isn't sign extended more concisely diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c index 0b347cc19aa5..7dc9338502e5 100644 --- a/drivers/media/i2c/video-i2c.c +++ b/drivers/media/i2c/video-i2c.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -77,6 +78,9 @@ struct video_i2c_chip { /* xfer function */ int (*xfer)(struct video_i2c_data *data, char *buf); + + /* hwmon init function */ + int (*hwmon_init)(struct video_i2c_data *data); }; static int amg88xx_xfer(struct video_i2c_data *data, char *buf) @@ -101,6 +105,74 @@ static int amg88xx_xfer(struct video_i2c_data *data, char *buf) return (ret == 2) ? 0 : -EIO; } +#if IS_ENABLED(CONFIG_HWMON) + +static const u32 amg88xx_temp_config[] = { + HWMON_T_INPUT, + 0 +}; + +static const struct hwmon_channel_info amg88xx_temp = { + .type = hwmon_temp, + .config = amg88xx_temp_config, +}; + +static const struct hwmon_channel_info *amg88xx_info[] = { + &amg88xx_temp, + NULL +}; + +static umode_t amg88xx_is_visible(const void *drvdata, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + return 0444; +} + +static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct video_i2c_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int tmp = i2c_smbus_read_word_data(client, 0x0e); + + if (tmp < 0) + return tmp; + + /* + * Check for sign bit, this isn't a two's complement value but an + * absolute temperature that needs to be inverted in the case of being + * negative. + */ + if (tmp & BIT(11)) + tmp = -(tmp & 0x7ff); + + *val = (tmp * 625) / 10; + + return 0; +} + +static const struct hwmon_ops amg88xx_hwmon_ops = { + .is_visible = amg88xx_is_visible, + .read = amg88xx_read, +}; + +static const struct hwmon_chip_info amg88xx_chip_info = { + .ops = &amg88xx_hwmon_ops, + .info = amg88xx_info, +}; + +static int amg88xx_hwmon_init(struct video_i2c_data *data) +{ + void *hwmon = devm_hwmon_device_register_with_info(&data->client->dev, + "amg88xx", data, &amg88xx_chip_info, NULL); + + return PTR_ERR(hwmon); +} +#else +#define amg88xx_hwmon_init NULL +#endif + #define AMG88XX 0 static const struct video_i2c_chip video_i2c_chip[] = { @@ -111,6 +183,7 @@ static const struct video_i2c_chip video_i2c_chip[] = { .buffer_size = 128, .bpp = 16, .xfer = &amg88xx_xfer, + .hwmon_init = amg88xx_hwmon_init, }, }; @@ -505,6 +578,14 @@ static int video_i2c_probe(struct i2c_client *client, video_set_drvdata(&data->vdev, data); i2c_set_clientdata(client, data); + if (data->chip->hwmon_init) { + ret = data->chip->hwmon_init(data); + if (ret < 0) { + dev_warn(&client->dev, + "failed to register hwmon device\n"); + } + } + ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1); if (ret < 0) goto error_unregister_device;