From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98B6CC433E0 for ; Sun, 31 May 2020 14:42:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73A912074A for ; Sun, 31 May 2020 14:42:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590936145; bh=GAx+82x99RdNgWYjm/WCxDyQXCQkvjhfbgexOhhOB3A=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=Hnc/0O2JBVS13hiQFt/0tjkQBH6kuLxgvZKwtYN8FDzRQGXgYTcUMfne5Dwu15nER o2qZZ+2OKsendVMGc2hTXAxpuBsIbtfbcI9topaOhgNr/eBmx4EYVFTipXZ63wbFPn vmuc4d96VAc7LDbjHgGs/ljBfUL8ssR0xzRchiSY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728049AbgEaOmV (ORCPT ); Sun, 31 May 2020 10:42:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:40718 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725889AbgEaOmV (ORCPT ); Sun, 31 May 2020 10:42:21 -0400 Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1C5212074A; Sun, 31 May 2020 14:42:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590936140; bh=GAx+82x99RdNgWYjm/WCxDyQXCQkvjhfbgexOhhOB3A=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=dZNHdeWnx0Wc0K67qxYEMFURXe7FKEgRg2IEbIggix6JT8xKPauw8n8SPDdwryocn ohj88wf9R8gKp/O9t7k4H1JxxrXwn6W2rDVDFgdHMoeQLeAal095OtJUWCef1KDqv5 sA6FRITJfMR+bGpS/1nYcL6ZUpRpZZUz3/T8ORHw= Date: Sun, 31 May 2020 15:42:16 +0100 From: Jonathan Cameron To: Alexandru Ardelean Cc: , , , , , Subject: Re: [PATCH] iio: at91_adc: remove usage of iio_priv_to_dev() helper Message-ID: <20200531154216.361285c6@archlinux> In-Reply-To: <20200525102513.130664-1-alexandru.ardelean@analog.com> References: <20200525102513.130664-1-alexandru.ardelean@analog.com> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On Mon, 25 May 2020 13:25:13 +0300 Alexandru Ardelean wrote: > We may want to get rid of the iio_priv_to_dev() helper. The reason is that > we will hide some of the members of the iio_dev structure (to prevent > drivers from accessing them directly), and that will also mean hiding the > implementation of the iio_priv_to_dev() helper inside the IIO core. > > Hiding the implementation of iio_priv_to_dev() implies that some fast-paths > may not be fast anymore, so a general idea is to try to get rid of the > iio_priv_to_dev() altogether. > The iio_priv() helper won't be affected by the rework, as the iio_dev > struct will keep a reference to the private information. > > For this driver, not using iio_priv_to_dev(), means reworking some paths to > pass the iio device and using iio_priv() to access the private information. > > Signed-off-by: Alexandru Ardelean Looks good to me. Will leave it a bit longer though to potentially get some people more familiar with the driver to sanity check it. Poke me after the usual couple of weeks if I seem to have lost it down the back of the sofa. Thanks, Jonathan > --- > drivers/iio/adc/at91_adc.c | 30 +++++++++++++++--------------- > 1 file changed, 15 insertions(+), 15 deletions(-) > > diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c > index 0368b6dc6d60..896af58e88bc 100644 > --- a/drivers/iio/adc/at91_adc.c > +++ b/drivers/iio/adc/at91_adc.c > @@ -287,13 +287,13 @@ static void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) > } > } > > -static int at91_ts_sample(struct at91_adc_state *st) > +static int at91_ts_sample(struct iio_dev *idev) > { > + struct at91_adc_state *st = iio_priv(idev); > unsigned int xscale, yscale, reg, z1, z2; > unsigned int x, y, pres, xpos, ypos; > unsigned int rxp = 1; > unsigned int factor = 1000; > - struct iio_dev *idev = iio_priv_to_dev(st); > > unsigned int xyz_mask_bits = st->res; > unsigned int xyz_mask = (1 << xyz_mask_bits) - 1; > @@ -449,7 +449,7 @@ static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) > > if (status & AT91_ADC_ISR_PENS) { > /* validate data by pen contact */ > - at91_ts_sample(st); > + at91_ts_sample(idev); > } else { > /* triggered by event that is no pen contact, just read > * them to clean the interrupt and discard all. > @@ -737,10 +737,10 @@ static int at91_adc_read_raw(struct iio_dev *idev, > return -EINVAL; > } > > -static int at91_adc_of_get_resolution(struct at91_adc_state *st, > +static int at91_adc_of_get_resolution(struct iio_dev *idev, > struct platform_device *pdev) > { > - struct iio_dev *idev = iio_priv_to_dev(st); > + struct at91_adc_state *st = iio_priv(idev); > struct device_node *np = pdev->dev.of_node; > int count, i, ret = 0; > char *res_name, *s; > @@ -866,10 +866,10 @@ static int at91_adc_probe_dt_ts(struct device_node *node, > } > } > > -static int at91_adc_probe_dt(struct at91_adc_state *st, > +static int at91_adc_probe_dt(struct iio_dev *idev, > struct platform_device *pdev) > { > - struct iio_dev *idev = iio_priv_to_dev(st); > + struct at91_adc_state *st = iio_priv(idev); > struct device_node *node = pdev->dev.of_node; > struct device_node *trig_node; > int i = 0, ret; > @@ -910,7 +910,7 @@ static int at91_adc_probe_dt(struct at91_adc_state *st, > } > st->vref_mv = prop; > > - ret = at91_adc_of_get_resolution(st, pdev); > + ret = at91_adc_of_get_resolution(idev, pdev); > if (ret) > goto error_ret; > > @@ -1010,9 +1010,9 @@ static void atmel_ts_close(struct input_dev *dev) > at91_adc_writel(st, AT91_ADC_IDR, AT91RL_ADC_IER_PEN); > } > > -static int at91_ts_hw_init(struct at91_adc_state *st, u32 adc_clk_khz) > +static int at91_ts_hw_init(struct iio_dev *idev, u32 adc_clk_khz) > { > - struct iio_dev *idev = iio_priv_to_dev(st); > + struct at91_adc_state *st = iio_priv(idev); > u32 reg = 0; > u32 tssctim = 0; > int i = 0; > @@ -1085,11 +1085,11 @@ static int at91_ts_hw_init(struct at91_adc_state *st, u32 adc_clk_khz) > return 0; > } > > -static int at91_ts_register(struct at91_adc_state *st, > +static int at91_ts_register(struct iio_dev *idev, > struct platform_device *pdev) > { > + struct at91_adc_state *st = iio_priv(idev); > struct input_dev *input; > - struct iio_dev *idev = iio_priv_to_dev(st); > int ret; > > input = input_allocate_device(); > @@ -1161,7 +1161,7 @@ static int at91_adc_probe(struct platform_device *pdev) > st = iio_priv(idev); > > if (pdev->dev.of_node) > - ret = at91_adc_probe_dt(st, pdev); > + ret = at91_adc_probe_dt(idev, pdev); > else > ret = at91_adc_probe_pdata(st, pdev); > > @@ -1301,11 +1301,11 @@ static int at91_adc_probe(struct platform_device *pdev) > goto error_disable_adc_clk; > } > } else { > - ret = at91_ts_register(st, pdev); > + ret = at91_ts_register(idev, pdev); > if (ret) > goto error_disable_adc_clk; > > - at91_ts_hw_init(st, adc_clk_khz); > + at91_ts_hw_init(idev, adc_clk_khz); > } > > ret = iio_device_register(idev);