[v2,01/11] pwm: Make .get_state() callback return an error code

Message ID	20221130152148.2769768-2-u.kleine-koenig@pengutronix.de
State	New
Headers	show Return-Path: <linux-leds-owner@kernel.org> 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 D759DC4332F for <linux-leds@archiver.kernel.org>; Wed, 30 Nov 2022 15:23:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229852AbiK3PXI (ORCPT <rfc822;linux-leds@archiver.kernel.org>); Wed, 30 Nov 2022 10:23:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229899AbiK3PXD (ORCPT <rfc822;linux-leds@vger.kernel.org>); Wed, 30 Nov 2022 10:23:03 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4DB844F1AC for <linux-leds@vger.kernel.org>; Wed, 30 Nov 2022 07:23:00 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <ukl@pengutronix.de>) id 1p0OuS-00009t-Vo; Wed, 30 Nov 2022 16:22:05 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from <ukl@pengutronix.de>) id 1p0OuJ-001LdS-Sq; Wed, 30 Nov 2022 16:21:56 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from <ukl@pengutronix.de>) id 1p0OuJ-001Vqc-PU; Wed, 30 Nov 2022 16:21:55 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de> To: Thierry Reding <thierry.reding@gmail.com> Cc: Conor Dooley <conor.dooley@microchip.com>, Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, Douglas Anderson <dianders@chromium.org>, Pavel Machek <pavel@ucw.cz>, Claudiu Beznea <claudiu.beznea@microchip.com>, Nicolas Ferre <nicolas.ferre@microchip.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Ray Jui <rjui@broadcom.com>, Scott Branden <sbranden@broadcom.com>, Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>, Benson Leung <bleung@chromium.org>, Guenter Roeck <groeck@chromium.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Kevin Hilman <khilman@baylibre.com>, Jerome Brunet <jbrunet@baylibre.com>, Martin Blumenstingl <martin.blumenstingl@googlemail.com>, Matthias Brugger <matthias.bgg@gmail.com>, Florian Fainelli <f.fainelli@gmail.com>, Heiko Stuebner <heiko@sntech.de>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, Michael Walle <michael@walle.cc>, Orson Zhai <orsonzhai@gmail.com>, Baolin Wang <baolin.wang@linux.alibaba.com>, Chunyan Zhang <zhang.lyra@gmail.com>, Fabrice Gasnier <fabrice.gasnier@foss.st.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Chen-Yu Tsai <wens@csie.org>, Samuel Holland <samuel@sholland.org>, Hammer Hsieh <hammerh0314@gmail.com>, Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>, Sean Anderson <sean.anderson@seco.com>, Michal Simek <michal.simek@xilinx.com>, Bjorn Andersson <andersson@kernel.org>, Stephen Boyd <swboyd@chromium.org>, Matthias Kaehlcke <mka@chromium.org>, Satya Priya <quic_c_skakit@quicinc.com>, linux-pwm@vger.kernel.org, linux-gpio@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, linux-arm-kernel@lists.infradead.org, chrome-platform@lists.linux.dev, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-riscv@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-sunxi@lists.linux.dev Subject: [PATCH v2 01/11] pwm: Make .get_state() callback return an error code Date: Wed, 30 Nov 2022 16:21:38 +0100 Message-Id: <20221130152148.2769768-2-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130152148.2769768-1-u.kleine-koenig@pengutronix.de> References: <20221130152148.2769768-1-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Developer-Signature: v=1; a=openpgp-sha256; l=33730; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=6aKwDQeWFfhk7HNIUIW+KFczG8dz0Cbl6n6wGeYnRI0=; b=owEBbQGS/pANAwAKAcH8FHityuwJAcsmYgBjh3TheqBOZnA37N8EiQMSn8aVt1bApU3hGZu9W2/8 Lk3LwJ+JATMEAAEKAB0WIQR+cioWkBis/z50pAvB/BR4rcrsCQUCY4d04QAKCRDB/BR4rcrsCaikCA CHUvfaYuPDw9QNqML6mJZ8m6CeaoJG8CMLK9nxftXBxxPYpQqGDOyOOB/ScP6OgtbdFTUj/GxdeHtK x5pBgrOrJMvaKiqONoJEUEcVb22lzmWgsGOzjyjfUChlljfw+e06BJe6uunideRUW3Pf1dRw3G5/sI Jcp/YWEzuM26Bjnp6guP4OYMLZiL1cPMZgvK16TaE6AY/ECbVyf5eOs8NhzSugjwavxp2Fot8omx2T n5TCOyO02/LoLYwff8tF9SWW3Cw6FkoeW4MuUm9B3kF7o5iG0ECNqUqJFNy5R4PEj3jXbJjJpBf+OK UsUTssaW73uOGg6t8ZRtwPYauMF8ce X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-leds@vger.kernel.org Precedence: bulk List-ID: <linux-leds.vger.kernel.org> X-Mailing-List: linux-leds@vger.kernel.org
Series	pwm: Allow .get_state to fail \| expand [v2,00/11] pwm: Allow .get_state to fail [v2,01/11] pwm: Make .get_state() callback return an error code [v2,04/11] leds: qcom-lpg: Propagate errors in .get_state() to the caller

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index 1bb317b8dcce..91a4232ee58c 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -657,9 +657,10 @@ static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) spin_unlock_irqrestore(&mvpwm->lock, flags); } -static void mvebu_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) { +static int mvebu_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; @@ -693,6 +694,8 @@ static void mvebu_pwm_get_state(struct pwm_chip *chip, state->enabled = false; spin_unlock_irqrestore(&mvpwm->lock, flags); + + return 0; } static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 3c3561942eb6..6826d2423ae9 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -1500,8 +1500,8 @@ static int ti_sn_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct ti_sn65dsi86 *pdata = pwm_chip_to_ti_sn_bridge(chip); unsigned int pwm_en_inv; @@ -1512,19 +1512,19 @@ static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, ret = regmap_read(pdata->regmap, SN_PWM_EN_INV_REG, &pwm_en_inv); if (ret) - return; + return 0; ret = ti_sn65dsi86_read_u16(pdata, SN_BACKLIGHT_SCALE_REG, &scale); if (ret) - return; + return 0; ret = ti_sn65dsi86_read_u16(pdata, SN_BACKLIGHT_REG, &backlight); if (ret) - return; + return 0; ret = regmap_read(pdata->regmap, SN_PWM_PRE_DIV_REG, &pre_div); if (ret) - return; + return 0; state->enabled = FIELD_GET(SN_PWM_EN_MASK, pwm_en_inv); if (FIELD_GET(SN_PWM_INV_MASK, pwm_en_inv)) @@ -1539,6 +1539,8 @@ static void ti_sn_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, if (state->duty_cycle > state->period) state->duty_cycle = state->period; + + return 0; } static const struct pwm_ops ti_sn_pwm_ops = { diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c index 02f51cc61837..741cc2fd817d 100644 --- a/drivers/leds/rgb/leds-qcom-lpg.c +++ b/drivers/leds/rgb/leds-qcom-lpg.c @@ -968,8 +968,8 @@ static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct lpg *lpg = container_of(chip, struct lpg, pwm); struct lpg_channel *chan = &lpg->channels[pwm->hwpwm]; @@ -982,20 +982,20 @@ static void lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, ret = regmap_read(lpg->map, chan->base + LPG_SIZE_CLK_REG, &val); if (ret) - return; + return 0; refclk = lpg_clk_rates[val & PWM_CLK_SELECT_MASK]; if (refclk) { ret = regmap_read(lpg->map, chan->base + LPG_PREDIV_CLK_REG, &val); if (ret) - return; + return 0; pre_div = lpg_pre_divs[FIELD_GET(PWM_FREQ_PRE_DIV_MASK, val)]; m = FIELD_GET(PWM_FREQ_EXP_MASK, val); ret = regmap_bulk_read(lpg->map, chan->base + PWM_VALUE_REG, &pwm_value, sizeof(pwm_value)); if (ret) - return; + return 0; state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * LPG_RESOLUTION * pre_div * (1 << m), refclk); state->duty_cycle = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * pwm_value * pre_div * (1 << m), refclk); @@ -1006,13 +1006,15 @@ static void lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, ret = regmap_read(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, &val); if (ret) - return; + return 0; state->enabled = FIELD_GET(LPG_ENABLE_CONTROL_OUTPUT, val); state->polarity = PWM_POLARITY_NORMAL; if (state->duty_cycle > state->period) state->duty_cycle = state->period; + + return 0; } static const struct pwm_ops lpg_pwm_ops = { diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index 8e00a4286145..cdbc23649032 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -356,8 +356,8 @@ static int atmel_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void atmel_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int atmel_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip); u32 sr, cmr; @@ -396,6 +396,8 @@ static void atmel_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->polarity = PWM_POLARITY_INVERSED; else state->polarity = PWM_POLARITY_NORMAL; + + return 0; } static const struct pwm_ops atmel_pwm_ops = { diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c index 7251037d4dd5..97ec131eb7c1 100644 --- a/drivers/pwm/pwm-bcm-iproc.c +++ b/drivers/pwm/pwm-bcm-iproc.c @@ -68,8 +68,8 @@ static void iproc_pwmc_disable(struct iproc_pwmc *ip, unsigned int channel) ndelay(400); } -static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct iproc_pwmc *ip = to_iproc_pwmc(chip); u64 tmp, multi, rate; @@ -91,7 +91,7 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, if (rate == 0) { state->period = 0; state->duty_cycle = 0; - return; + return 0; } value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); @@ -107,6 +107,8 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, value = readl(ip->base + IPROC_PWM_DUTY_CYCLE_OFFSET(pwm->hwpwm)); tmp = (value & IPROC_PWM_PERIOD_MAX) * multi; state->duty_cycle = div64_u64(tmp, rate); + + return 0; } static int iproc_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c index 7b357d1cf642..4099850117ba 100644 --- a/drivers/pwm/pwm-crc.c +++ b/drivers/pwm/pwm-crc.c @@ -121,8 +121,8 @@ static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip); struct device *dev = crc_pwm->chip.dev; @@ -132,13 +132,13 @@ static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, error = regmap_read(crc_pwm->regmap, PWM0_CLK_DIV, &clk_div_reg); if (error) { dev_err(dev, "Error reading PWM0_CLK_DIV %d\n", error); - return; + return 0; } error = regmap_read(crc_pwm->regmap, PWM0_DUTY_CYCLE, &duty_cycle_reg); if (error) { dev_err(dev, "Error reading PWM0_DUTY_CYCLE %d\n", error); - return; + return 0; } clk_div = (clk_div_reg & ~PWM_OUTPUT_ENABLE) + 1; @@ -149,6 +149,8 @@ static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, DIV_ROUND_UP_ULL(duty_cycle_reg * state->period, PWM_MAX_LEVEL); state->polarity = PWM_POLARITY_NORMAL; state->enabled = !!(clk_div_reg & PWM_OUTPUT_ENABLE); + + return 0; } static const struct pwm_ops crc_pwm_ops = { diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c index 7f10f56c3eb6..11684edc0620 100644 --- a/drivers/pwm/pwm-cros-ec.c +++ b/drivers/pwm/pwm-cros-ec.c @@ -183,8 +183,8 @@ static int cros_ec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct cros_ec_pwm_device *ec_pwm = pwm_to_cros_ec_pwm(chip); struct cros_ec_pwm *channel = pwm_get_chip_data(pwm); @@ -193,7 +193,7 @@ static void cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, ret = cros_ec_pwm_get_duty(ec_pwm, pwm->hwpwm); if (ret < 0) { dev_err(chip->dev, "error getting initial duty: %d\n", ret); - return; + return 0; } state->enabled = (ret > 0); @@ -212,6 +212,8 @@ static void cros_ec_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->duty_cycle = channel->duty_cycle; else state->duty_cycle = ret; + + return 0; } static struct pwm_device * diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c index 7568300bb11e..bd2308812096 100644 --- a/drivers/pwm/pwm-dwc.c +++ b/drivers/pwm/pwm-dwc.c @@ -163,8 +163,8 @@ static int dwc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct dwc_pwm *dwc = to_dwc_pwm(chip); u64 duty, period; @@ -188,6 +188,8 @@ static void dwc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->polarity = PWM_POLARITY_INVERSED; pm_runtime_put_sync(chip->dev); + + return 0; } static const struct pwm_ops dwc_pwm_ops = { diff --git a/drivers/pwm/pwm-hibvt.c b/drivers/pwm/pwm-hibvt.c index 333f1b18ff4e..12c05c155cab 100644 --- a/drivers/pwm/pwm-hibvt.c +++ b/drivers/pwm/pwm-hibvt.c @@ -128,8 +128,8 @@ static void hibvt_pwm_set_polarity(struct pwm_chip *chip, PWM_POLARITY_MASK, (0x0 << PWM_POLARITY_SHIFT)); } -static void hibvt_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int hibvt_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip); void __iomem *base; @@ -146,6 +146,8 @@ static void hibvt_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, value = readl(base + PWM_CTRL_ADDR(pwm->hwpwm)); state->enabled = (PWM_ENABLE_MASK & value); + + return 0; } static int hibvt_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-imx-tpm.c b/drivers/pwm/pwm-imx-tpm.c index e5e7b7c339a8..ed1aad96fff0 100644 --- a/drivers/pwm/pwm-imx-tpm.c +++ b/drivers/pwm/pwm-imx-tpm.c @@ -132,9 +132,9 @@ static int pwm_imx_tpm_round_state(struct pwm_chip *chip, return 0; } -static void pwm_imx_tpm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int pwm_imx_tpm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct imx_tpm_pwm_chip *tpm = to_imx_tpm_pwm_chip(chip); u32 rate, val, prescale; @@ -164,6 +164,8 @@ static void pwm_imx_tpm_get_state(struct pwm_chip *chip, /* get channel status */ state->enabled = FIELD_GET(PWM_IMX_TPM_CnSC_ELS, val) ? true : false; + + return 0; } /* this function is supposed to be called with mutex hold */ diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c index ea91a2f81a9f..3a22c2fddc45 100644 --- a/drivers/pwm/pwm-imx27.c +++ b/drivers/pwm/pwm-imx27.c @@ -118,8 +118,8 @@ static void pwm_imx27_clk_disable_unprepare(struct pwm_imx27_chip *imx) clk_disable_unprepare(imx->clk_ipg); } -static void pwm_imx27_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, struct pwm_state *state) +static int pwm_imx27_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, struct pwm_state *state) { struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip); u32 period, prescaler, pwm_clk, val; @@ -128,7 +128,7 @@ static void pwm_imx27_get_state(struct pwm_chip *chip, ret = pwm_imx27_clk_prepare_enable(imx); if (ret < 0) - return; + return 0; val = readl(imx->mmio_base + MX3_PWMCR); @@ -170,6 +170,8 @@ static void pwm_imx27_get_state(struct pwm_chip *chip, state->duty_cycle = DIV_ROUND_UP_ULL(tmp, pwm_clk); pwm_imx27_clk_disable_unprepare(imx); + + return 0; } static void pwm_imx27_sw_reset(struct pwm_chip *chip) diff --git a/drivers/pwm/pwm-intel-lgm.c b/drivers/pwm/pwm-intel-lgm.c index b66c35074087..0cd7dd548e82 100644 --- a/drivers/pwm/pwm-intel-lgm.c +++ b/drivers/pwm/pwm-intel-lgm.c @@ -86,8 +86,8 @@ static int lgm_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return lgm_pwm_enable(chip, 1); } -static void lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct lgm_pwm_chip *pc = to_lgm_pwm_chip(chip); u32 duty, val; @@ -100,6 +100,8 @@ static void lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, regmap_read(pc->regmap, LGM_PWM_FAN_CON0, &val); duty = FIELD_GET(LGM_PWM_FAN_DC_MSK, val); state->duty_cycle = DIV_ROUND_UP(duty * pc->period, LGM_PWM_MAX_DUTY_CYCLE); + + return 0; } static const struct pwm_ops lgm_pwm_ops = { diff --git a/drivers/pwm/pwm-iqs620a.c b/drivers/pwm/pwm-iqs620a.c index 54bd95a5cab0..15aae53db5ab 100644 --- a/drivers/pwm/pwm-iqs620a.c +++ b/drivers/pwm/pwm-iqs620a.c @@ -104,8 +104,8 @@ static int iqs620_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void iqs620_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int iqs620_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct iqs620_pwm_private *iqs620_pwm; @@ -126,6 +126,8 @@ static void iqs620_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, mutex_unlock(&iqs620_pwm->lock); state->period = IQS620_PWM_PERIOD_NS; + + return 0; } static int iqs620_pwm_notifier(struct notifier_block *notifier, diff --git a/drivers/pwm/pwm-keembay.c b/drivers/pwm/pwm-keembay.c index 733811b05721..ac02d8bb4a0b 100644 --- a/drivers/pwm/pwm-keembay.c +++ b/drivers/pwm/pwm-keembay.c @@ -89,8 +89,8 @@ static void keembay_pwm_disable(struct keembay_pwm *priv, int ch) KMB_PWM_LEADIN_OFFSET(ch)); } -static void keembay_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int keembay_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct keembay_pwm *priv = to_keembay_pwm_dev(chip); unsigned long long high, low; @@ -113,6 +113,8 @@ static void keembay_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->duty_cycle = DIV_ROUND_UP_ULL(high, clk_rate); state->period = DIV_ROUND_UP_ULL(high + low, clk_rate); state->polarity = PWM_POLARITY_NORMAL; + + return 0; } static int keembay_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c index accdef5dd58e..81ac297b8ba5 100644 --- a/drivers/pwm/pwm-lpss.c +++ b/drivers/pwm/pwm-lpss.c @@ -205,8 +205,8 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct pwm_lpss_chip *lpwm = to_lpwm(chip); unsigned long base_unit_range; @@ -236,6 +236,8 @@ static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->enabled = !!(ctrl & PWM_ENABLE); pm_runtime_put(chip->dev); + + return 0; } static const struct pwm_ops pwm_lpss_ops = { diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 57112f438c6d..16d79ca5d8f5 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -318,8 +318,8 @@ static unsigned int meson_pwm_cnt_to_ns(struct pwm_chip *chip, return cnt * fin_ns * (channel->pre_div + 1); } -static void meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct meson_pwm *meson = to_meson_pwm(chip); struct meson_pwm_channel_data *channel_data; @@ -327,7 +327,7 @@ static void meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, u32 value, tmp; if (!state) - return; + return 0; channel = &meson->channels[pwm->hwpwm]; channel_data = &meson_pwm_per_channel_data[pwm->hwpwm]; @@ -357,6 +357,8 @@ static void meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->period = 0; state->duty_cycle = 0; } + + return 0; } static const struct pwm_ops meson_pwm_ops = { diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index c605013e4114..9a6bb334a31b 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -172,9 +172,9 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void mtk_disp_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int mtk_disp_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); u64 rate, period, high_width; @@ -184,14 +184,14 @@ static void mtk_disp_pwm_get_state(struct pwm_chip *chip, err = clk_prepare_enable(mdp->clk_main); if (err < 0) { dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err)); - return; + return 0; } err = clk_prepare_enable(mdp->clk_mm); if (err < 0) { dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err)); clk_disable_unprepare(mdp->clk_main); - return; + return 0; } rate = clk_get_rate(mdp->clk_main); @@ -211,6 +211,8 @@ static void mtk_disp_pwm_get_state(struct pwm_chip *chip, state->polarity = PWM_POLARITY_NORMAL; clk_disable_unprepare(mdp->clk_mm); clk_disable_unprepare(mdp->clk_main); + + return 0; } static const struct pwm_ops mtk_disp_pwm_ops = { diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c index f230c10d28bb..41be244e7dd3 100644 --- a/drivers/pwm/pwm-pca9685.c +++ b/drivers/pwm/pwm-pca9685.c @@ -431,8 +431,8 @@ static int pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct pca9685 *pca = to_pca(chip); unsigned long long duty; @@ -458,12 +458,14 @@ static void pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, */ state->duty_cycle = 0; state->enabled = false; - return; + return 0; } state->enabled = true; duty = pca9685_pwm_get_duty(pca, pwm->hwpwm); state->duty_cycle = DIV_ROUND_DOWN_ULL(duty * state->period, PCA9685_COUNTER_RANGE); + + return 0; } static int pca9685_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) diff --git a/drivers/pwm/pwm-raspberrypi-poe.c b/drivers/pwm/pwm-raspberrypi-poe.c index 6ff73029f367..2939b71a7ba7 100644 --- a/drivers/pwm/pwm-raspberrypi-poe.c +++ b/drivers/pwm/pwm-raspberrypi-poe.c @@ -82,9 +82,9 @@ static int raspberrypi_pwm_get_property(struct rpi_firmware *firmware, return 0; } -static void raspberrypi_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int raspberrypi_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct raspberrypi_pwm *rpipwm = raspberrypi_pwm_from_chip(chip); @@ -93,6 +93,8 @@ static void raspberrypi_pwm_get_state(struct pwm_chip *chip, RPI_PWM_MAX_DUTY); state->enabled = !!(rpipwm->duty_cycle); state->polarity = PWM_POLARITY_NORMAL; + + return 0; } static int raspberrypi_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c index a5af859217c1..3ec7d1756903 100644 --- a/drivers/pwm/pwm-rockchip.c +++ b/drivers/pwm/pwm-rockchip.c @@ -57,9 +57,9 @@ static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c) return container_of(c, struct rockchip_pwm_chip, chip); } -static void rockchip_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int rockchip_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); u32 enable_conf = pc->data->enable_conf; @@ -70,11 +70,11 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip, ret = clk_enable(pc->pclk); if (ret) - return; + return 0; ret = clk_enable(pc->clk); if (ret) - return; + return 0; clk_rate = clk_get_rate(pc->clk); @@ -96,6 +96,8 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip, clk_disable(pc->clk); clk_disable(pc->pclk); + + return 0; } static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c index 2d4fa5e5fdd4..1e9870aa29e9 100644 --- a/drivers/pwm/pwm-sifive.c +++ b/drivers/pwm/pwm-sifive.c @@ -105,8 +105,8 @@ static void pwm_sifive_update_clock(struct pwm_sifive_ddata *ddata, "New real_period = %u ns\n", ddata->real_period); } -static void pwm_sifive_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int pwm_sifive_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct pwm_sifive_ddata *ddata = pwm_sifive_chip_to_ddata(chip); u32 duty, val; @@ -123,6 +123,8 @@ static void pwm_sifive_get_state(struct pwm_chip *chip, struct pwm_device *pwm, state->duty_cycle = (u64)duty * ddata->real_period >> PWM_SIFIVE_CMPWIDTH; state->polarity = PWM_POLARITY_INVERSED; + + return 0; } static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-sl28cpld.c b/drivers/pwm/pwm-sl28cpld.c index 589aeaaa6ac8..e64900ad4ba1 100644 --- a/drivers/pwm/pwm-sl28cpld.c +++ b/drivers/pwm/pwm-sl28cpld.c @@ -87,9 +87,9 @@ struct sl28cpld_pwm { #define sl28cpld_pwm_from_chip(_chip) \ container_of(_chip, struct sl28cpld_pwm, pwm_chip) -static void sl28cpld_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int sl28cpld_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct sl28cpld_pwm *priv = sl28cpld_pwm_from_chip(chip); unsigned int reg; @@ -115,6 +115,8 @@ static void sl28cpld_pwm_get_state(struct pwm_chip *chip, * the PWM core. */ state->duty_cycle = min(state->duty_cycle, state->period); + + return 0; } static int sl28cpld_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c index 7004f55bbf11..bda8bc5af976 100644 --- a/drivers/pwm/pwm-sprd.c +++ b/drivers/pwm/pwm-sprd.c @@ -65,8 +65,8 @@ static void sprd_pwm_write(struct sprd_pwm_chip *spc, u32 hwid, writel_relaxed(val, spc->base + offset); } -static void sprd_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int sprd_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct sprd_pwm_chip *spc = container_of(chip, struct sprd_pwm_chip, chip); @@ -83,7 +83,7 @@ static void sprd_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, if (ret) { dev_err(spc->dev, "failed to enable pwm%u clocks\n", pwm->hwpwm); - return; + return 0; } val = sprd_pwm_read(spc, pwm->hwpwm, SPRD_PWM_ENABLE); @@ -113,6 +113,8 @@ static void sprd_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, /* Disable PWM clocks if the PWM channel is not in enable state. */ if (!state->enabled) clk_bulk_disable_unprepare(SPRD_PWM_CHN_CLKS_NUM, chn->clks); + + return 0; } static int sprd_pwm_config(struct sprd_pwm_chip *spc, struct pwm_device *pwm, diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c index 3115abb3f52a..39364c52cfe4 100644 --- a/drivers/pwm/pwm-stm32-lp.c +++ b/drivers/pwm/pwm-stm32-lp.c @@ -157,9 +157,9 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm, return ret; } -static void stm32_pwm_lp_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int stm32_pwm_lp_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct stm32_pwm_lp *priv = to_stm32_pwm_lp(chip); unsigned long rate = clk_get_rate(priv->clk); @@ -185,6 +185,8 @@ static void stm32_pwm_lp_get_state(struct pwm_chip *chip, tmp = prd - val; tmp = (tmp << presc) * NSEC_PER_SEC; state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, rate); + + return 0; } static const struct pwm_ops stm32_pwm_lp_ops = { diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index c8445b0a3339..37d75e252d4e 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -108,9 +108,9 @@ static inline void sun4i_pwm_writel(struct sun4i_pwm_chip *chip, writel(val, chip->base + offset); } -static void sun4i_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *pwm, - struct pwm_state *state) +static int sun4i_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) { struct sun4i_pwm_chip *sun4i_pwm = to_sun4i_pwm_chip(chip); u64 clk_rate, tmp; @@ -132,7 +132,7 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip, state->duty_cycle = DIV_ROUND_UP_ULL(state->period, 2); state->polarity = PWM_POLARITY_NORMAL; state->enabled = true; - return; + return 0; } if ((PWM_REG_PRESCAL(val, pwm->hwpwm) == PWM_PRESCAL_MASK) && @@ -142,7 +142,7 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip, prescaler = prescaler_table[PWM_REG_PRESCAL(val, pwm->hwpwm)]; if (prescaler == 0) - return; + return 0; if (val & BIT_CH(PWM_ACT_STATE, pwm->hwpwm)) state->polarity = PWM_POLARITY_NORMAL; @@ -162,6 +162,8 @@ static void sun4i_pwm_get_state(struct pwm_chip *chip, tmp = (u64)prescaler * NSEC_PER_SEC * PWM_REG_PRD(val); state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate); + + return 0; } static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm, diff --git a/drivers/pwm/pwm-sunplus.c b/drivers/pwm/pwm-sunplus.c index e776fd16512d..d6ebe9f03b35 100644 --- a/drivers/pwm/pwm-sunplus.c +++ b/drivers/pwm/pwm-sunplus.c @@ -124,8 +124,8 @@ static int sunplus_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void sunplus_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int sunplus_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct sunplus_pwm *priv = to_sunplus_pwm(chip); u32 mode0, dd_freq, duty; @@ -155,6 +155,8 @@ static void sunplus_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, } state->polarity = PWM_POLARITY_NORMAL; + + return 0; } static const struct pwm_ops sunplus_pwm_ops = { diff --git a/drivers/pwm/pwm-visconti.c b/drivers/pwm/pwm-visconti.c index 927c4cbb1daf..e3fb79b3e2a7 100644 --- a/drivers/pwm/pwm-visconti.c +++ b/drivers/pwm/pwm-visconti.c @@ -103,8 +103,8 @@ static int visconti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } -static void visconti_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) +static int visconti_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) { struct visconti_pwm_chip *priv = visconti_pwm_from_chip(chip); u32 period, duty, pwmc0, pwmc0_clk; @@ -122,6 +122,8 @@ static void visconti_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm state->polarity = PWM_POLARITY_NORMAL; state->enabled = true; + + return 0; } static const struct pwm_ops visconti_pwm_ops = { diff --git a/drivers/pwm/pwm-xilinx.c b/drivers/pwm/pwm-xilinx.c index 4dab2b86c427..f7a50fdcd9a5 100644 --- a/drivers/pwm/pwm-xilinx.c +++ b/drivers/pwm/pwm-xilinx.c @@ -169,9 +169,9 @@ static int xilinx_pwm_apply(struct pwm_chip *chip, struct pwm_device *unused, return 0; } -static void xilinx_pwm_get_state(struct pwm_chip *chip, - struct pwm_device *unused, - struct pwm_state *state) +static int xilinx_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *unused, + struct pwm_state *state) { struct xilinx_timer_priv *priv = xilinx_pwm_chip_to_priv(chip); u32 tlr0, tlr1, tcsr0, tcsr1; @@ -191,6 +191,8 @@ static void xilinx_pwm_get_state(struct pwm_chip *chip, */ if (state->period == state->duty_cycle) state->duty_cycle = 0; + + return 0; } static const struct pwm_ops xilinx_pwm_ops = { diff --git a/include/linux/pwm.h b/include/linux/pwm.h index d70c6e5a839d..4de09163c968 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -276,8 +276,8 @@ struct pwm_ops { struct pwm_capture *result, unsigned long timeout); int (*apply)(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state); - void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state); + int (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state); struct module *owner; };

[v2,01/11] pwm: Make .get_state() callback return an error code

Commit Message

Comments

Patch