From patchwork Thu Jan 19 13:34:10 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 9525759 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 306DF6020B for ; Thu, 19 Jan 2017 13:36:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2166928342 for ; Thu, 19 Jan 2017 13:36:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 164662842F; Thu, 19 Jan 2017 13:36:00 +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=-1.1 required=2.0 tests=BAYES_00,RDNS_NONE autolearn=no version=3.3.1 Received: from bombadil.infradead.org (unknown [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CABF928342 for ; Thu, 19 Jan 2017 13:35:58 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cUCsd-0007hT-6J; Thu, 19 Jan 2017 13:35:55 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cUCs2-0005jn-QL for linux-arm-kernel@lists.infradead.org; Thu, 19 Jan 2017 13:35:23 +0000 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id v0JDV9Mh012442; Thu, 19 Jan 2017 14:34:42 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-.pphosted.com with ESMTP id 27ya0b4e9f-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 19 Jan 2017 14:34:42 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 9915131; Thu, 19 Jan 2017 13:34:41 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 5D6282BF1; Thu, 19 Jan 2017 13:34:41 +0000 (GMT) Received: from localhost (10.75.127.49) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Thu, 19 Jan 2017 14:34:40 +0100 From: Fabrice Gasnier To: , , , , , Subject: [PATCH 3/7] iio: adc: stm32: add trigger polarity extended attribute Date: Thu, 19 Jan 2017 14:34:10 +0100 Message-ID: <1484832854-6314-4-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1484832854-6314-1-git-send-email-fabrice.gasnier@st.com> References: <1484832854-6314-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG4NODE3.st.com (10.75.127.12) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-01-19_04:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170119_053519_231179_ABAA2E04 X-CRM114-Status: GOOD ( 13.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, benjamin.gaignard@linaro.org, lars@metafoo.de, alexandre.torgue@st.com, linux-iio@vger.kernel.org, pmeerw@pmeerw.net, mcoquelin.stm32@gmail.com, knaack.h@gmx.de, fabrice.gasnier@st.com, benjamin.gaignard@st.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Define extended attribute so that user may choose rising, falling or both edges for external trigger sources. Default to rising edge in case it isn't set. Signed-off-by: Fabrice Gasnier --- drivers/iio/adc/stm32-adc.c | 51 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 30708bc..9753c39 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -164,6 +164,7 @@ struct stm32_adc_trig_info { * @lock: spinlock * @bufi: data buffer index * @num_conv: expected number of scan conversions + * @exten: external trigger config (enable/polarity) */ struct stm32_adc { struct stm32_adc_common *common; @@ -175,6 +176,7 @@ struct stm32_adc { spinlock_t lock; /* interrupt lock */ int bufi; int num_conv; + enum stm32_adc_exten exten; }; /** @@ -449,7 +451,9 @@ static int stm32_adc_set_trig(struct iio_dev *indio_dev, /* set trigger source, default to rising edge */ extsel = ret; - exten = STM32_EXTEN_HWTRIG_RISING_EDGE; + if (adc->exten == STM32_EXTEN_SWTRIG) + adc->exten = STM32_EXTEN_HWTRIG_RISING_EDGE; + exten = adc->exten; } spin_lock_irqsave(&adc->lock, flags); @@ -463,6 +467,39 @@ static int stm32_adc_set_trig(struct iio_dev *indio_dev, return 0; } +static int stm32_adc_set_trig_pol(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int type) +{ + struct stm32_adc *adc = iio_priv(indio_dev); + + adc->exten = type; + + return 0; +} + +static int stm32_adc_get_trig_pol(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct stm32_adc *adc = iio_priv(indio_dev); + + return adc->exten; +} + +static const char * const stm32_trig_pol_items[] = { + [STM32_EXTEN_SWTRIG] = "swtrig", + [STM32_EXTEN_HWTRIG_RISING_EDGE] = "rising-edge", + [STM32_EXTEN_HWTRIG_FALLING_EDGE] = "falling-edge", + [STM32_EXTEN_HWTRIG_BOTH_EDGES] = "both-edges", +}; + +const struct iio_enum stm32_adc_trig_pol = { + .items = stm32_trig_pol_items, + .num_items = ARRAY_SIZE(stm32_trig_pol_items), + .get = stm32_adc_get_trig_pol, + .set = stm32_adc_set_trig_pol, +}; + /** * stm32_adc_single_conv() - Performs a single conversion * @indio_dev: IIO device @@ -745,6 +782,17 @@ static irqreturn_t stm32_adc_trigger_handler(int irq, void *p) return IRQ_HANDLED; } +static const struct iio_chan_spec_ext_info stm32_adc_ext_info[] = { + IIO_ENUM("trigger_pol", IIO_SHARED_BY_ALL, &stm32_adc_trig_pol), + { + .name = "trigger_pol_available", + .shared = IIO_SHARED_BY_ALL, + .read = iio_enum_available_read, + .private = (uintptr_t)&stm32_adc_trig_pol, + }, + {}, +}; + static void stm32_adc_chan_init_one(struct iio_dev *indio_dev, struct iio_chan_spec *chan, const struct stm32_adc_chan_spec *channel, @@ -760,6 +808,7 @@ static void stm32_adc_chan_init_one(struct iio_dev *indio_dev, chan->scan_type.sign = 'u'; chan->scan_type.realbits = 12; chan->scan_type.storagebits = 16; + chan->ext_info = stm32_adc_ext_info; } static int stm32_adc_chan_of_init(struct iio_dev *indio_dev)