From patchwork Tue Feb 5 17:13:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Renato Lui Geh X-Patchwork-Id: 10797777 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 DB529746 for ; Tue, 5 Feb 2019 17:13:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C6F832BC3E for ; Tue, 5 Feb 2019 17:13:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BAD772BCB6; Tue, 5 Feb 2019 17:13:10 +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 0E9502BC3E for ; Tue, 5 Feb 2019 17:13:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726334AbfBERNI (ORCPT ); Tue, 5 Feb 2019 12:13:08 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:46700 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726196AbfBERNI (ORCPT ); Tue, 5 Feb 2019 12:13:08 -0500 Received: by mail-qk1-f196.google.com with SMTP id q1so2490712qkf.13; Tue, 05 Feb 2019 09:13:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=aQd3C5xCPpWRDiZ/M0ZBxtyqHjtchjaQtFbs62Zunek=; b=PxzFG/mklzS2hbm4u4aSJaDbmwffQB90kR0QqJXTuZev5Klb8Tsh0ViDZHPSD8xS69 BkIRn/Jqu4eK8gk38EAjVPFbaJdLJJSB6oL+e1A8hHermOG4AsXsmOBp68UxPJWwANA0 xTT036x3DjHW4ZG4qfNnlx0vcheEM7JEzxDo8O7t2zkVBJ/6eb2F6ZBhB82mS8Qez4pD q8BgaboGMaWBNTox+3enXzdWN6o6EVSIH/zrBkwZnLV3ELpI0bFkxCvmKItY6BH7vfAd hqparb/+2A3wfSnjC8mBTCXON4+H8qZVSj+gcAnRxJyAa5VyJ8YcNiFrDnNX23K1flCh RRIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=aQd3C5xCPpWRDiZ/M0ZBxtyqHjtchjaQtFbs62Zunek=; b=JqTGXVKsS18pCPqQZQ7DaJSO848CHnrgHIzetuONU0na1y0JNjd2T+n0Z1yQgCNA7s CYj8h5NJZ56t1VPJt+EYdyHF9VT0bKBpGgbSbLhHai4MiP+RgDc3JVGVDRmVWC56tpoC N3ljXwlkPl8cw4L8Xp0bn1/+Ahv4oxcENN4eWck3GI9YOzpBeMUDgB317kOXj/3ctcwz P/gijNz3qdVQEzabKgtLWHRpPH0DOABXdVPK1f5VHmvNCUJfPQNu9/fAnXDtFfUchWne AcjdF3IsDAkaPS++m1/zyEp3MnmVDWZqxHZ6CqI+QJWxnoQvGYdXItSRzickURo6XUHF N05A== X-Gm-Message-State: AHQUAuYC52jM44pL4BTBDt1GQSw3U9TWgJDCJvj4L14qLW1ZBDBIUFD8 0JrwC343xCaV7LSkqThKdyw= X-Google-Smtp-Source: AHgI3IaXT0GkBrFrFSgXrFK0KdaZXJfSKSm7ZWQmxAin/PrtK/o85nHmYWEqSn12P4g6BGVoErbGvQ== X-Received: by 2002:ae9:c215:: with SMTP id j21mr1998296qkg.97.1549386786576; Tue, 05 Feb 2019 09:13:06 -0800 (PST) Received: from renatolg ([143.107.45.1]) by smtp.gmail.com with ESMTPSA id v30sm5846963qtk.13.2019.02.05.09.13.03 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 05 Feb 2019 09:13:06 -0800 (PST) Date: Tue, 5 Feb 2019 15:13:00 -0200 From: Renato Lui Geh To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, knaack.h@gmx.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org, stefan.popa@analog.com, alexandru.Ardelean@analog.com, giuliano.belinassi@usp.br Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-usp@googlegroups.com Subject: [PATCH v3 1/4] staging: iio: ad7780: add gain & filter gpio support Message-ID: <786543cbd8d60776083bcaca66f83502f23f561b.1549385784.git.renatogeh@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20180716 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Previously, the AD7780 driver only supported gpio for the 'powerdown' pin. This commit adds suppport for the 'gain' and 'filter' pin. Signed-off-by: Renato Lui Geh Signed-off-by: Giuliano Belinassi Co-developed-by: Giuliano Belinassi --- Changes in v3: - Renamed ad7780_chip_info's filter to odr - Renamed ad778x_filter to ad778x_odr_avail - Changed vref variable from unsigned int to unsigned long long to avoid overflow - Removed unnecessary AD_SD_CHANNEL macro drivers/staging/iio/adc/ad7780.c | 95 ++++++++++++++++++++++++++++++-- 1 file changed, 89 insertions(+), 6 deletions(-) diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c index c4a85789c2db..6e4357800d31 100644 --- a/drivers/staging/iio/adc/ad7780.c +++ b/drivers/staging/iio/adc/ad7780.c @@ -39,6 +39,15 @@ #define AD7170_PATTERN (AD7780_PAT0 | AD7170_PAT2) #define AD7170_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1 | AD7170_PAT2) +#define AD7780_GAIN_GPIO 0 +#define AD7780_FILTER_GPIO 1 + +#define AD7780_GAIN_MIDPOINT 64 +#define AD7780_FILTER_MIDPOINT 13350 + +static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_odr_avail[2] = { 10000, 16700 }; + struct ad7780_chip_info { struct iio_chan_spec channel; unsigned int pattern_mask; @@ -50,7 +59,11 @@ struct ad7780_state { const struct ad7780_chip_info *chip_info; struct regulator *reg; struct gpio_desc *powerdown_gpio; - unsigned int gain; + struct gpio_desc *gain_gpio; + struct gpio_desc *filter_gpio; + unsigned int gain; + unsigned int odr; + unsigned int int_vref_mv; struct ad_sigma_delta sd; }; @@ -104,17 +117,65 @@ static int ad7780_read_raw(struct iio_dev *indio_dev, voltage_uv = regulator_get_voltage(st->reg); if (voltage_uv < 0) return voltage_uv; - *val = (voltage_uv / 1000) * st->gain; + voltage_uv /= 1000; + *val = voltage_uv * st->gain; *val2 = chan->scan_type.realbits - 1; + st->int_vref_mv = voltage_uv; return IIO_VAL_FRACTIONAL_LOG2; case IIO_CHAN_INFO_OFFSET: *val = -(1 << (chan->scan_type.realbits - 1)); return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = st->odr; + return IIO_VAL_INT; } return -EINVAL; } +static int ad7780_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long m) +{ + struct ad7780_state *st = iio_priv(indio_dev); + const struct ad7780_chip_info *chip_info = st->chip_info; + unsigned long long vref; + unsigned int full_scale, gain; + + if (!chip_info->is_ad778x) + return 0; + + switch (m) { + case IIO_CHAN_INFO_SCALE: + if (val != 0) + return -EINVAL; + + vref = st->int_vref_mv * 1000000LL; + full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); + gain = DIV_ROUND_CLOSEST(vref, full_scale); + gain = DIV_ROUND_CLOSEST(gain, val2); + st->gain = gain; + if (gain < AD7780_GAIN_MIDPOINT) + gain = 0; + else + gain = 1; + gpiod_set_value(st->gain_gpio, gain); + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) + val = 0; + else + val = 1; + st->odr = ad778x_odr_avail[val]; + gpiod_set_value(st->filter_gpio, val); + break; + } + + return 0; +} + static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, unsigned int raw_sample) { @@ -126,10 +187,8 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, return -EIO; if (chip_info->is_ad778x) { - if (raw_sample & AD7780_GAIN) - st->gain = 1; - else - st->gain = 128; + st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; + st->odr = ad778x_odr_avail[raw_sample & AD7780_FILTER]; } return 0; @@ -173,6 +232,7 @@ static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { static const struct iio_info ad7780_info = { .read_raw = ad7780_read_raw, + .write_raw = ad7780_write_raw, }; static int ad7780_probe(struct spi_device *spi) @@ -222,6 +282,29 @@ static int ad7780_probe(struct spi_device *spi) goto error_disable_reg; } + if (st->chip_info->is_ad778x) { + st->gain_gpio = devm_gpiod_get_optional(&spi->dev, + "gain", + GPIOD_OUT_HIGH); + if (IS_ERR(st->gain_gpio)) { + ret = PTR_ERR(st->gain_gpio); + dev_err(&spi->dev, "Failed to request gain GPIO: %d\n", + ret); + goto error_disable_reg; + } + + st->filter_gpio = devm_gpiod_get_optional(&spi->dev, + "filter", + GPIOD_OUT_HIGH); + if (IS_ERR(st->filter_gpio)) { + ret = PTR_ERR(st->filter_gpio); + dev_err(&spi->dev, + "Failed to request filter GPIO: %d\n", + ret); + goto error_disable_reg; + } + } + ret = ad_sd_setup_buffer_and_trigger(indio_dev); if (ret) goto error_disable_reg;