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From: Marijn Suijten <marijn.suijten@somainline.org>
To: phone-devel@vger.kernel.org, Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Lee Jones <lee.jones@linaro.org>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Jingoo Han <jingoohan1@gmail.com>
Cc: ~postmarketos/upstreaming@lists.sr.ht,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@somainline.org>,
	Konrad Dybcio <konrad.dybcio@somainline.org>,
	Martin Botka <martin.botka@somainline.org>,
	Jami Kettunen <jami.kettunen@somainline.org>,
	Pavel Dubrova <pashadubrova@gmail.com>,
	Marijn Suijten <marijn.suijten@somainline.org>,
	Kiran Gunda <kgunda@codeaurora.org>,
	Courtney Cavin <courtney.cavin@sonymobile.com>,
	Bryan Wu <cooloney@gmail.com>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/10] backlight: qcom-wled: Use cpu_to_le16 macro to perform conversion
Date: Mon,  4 Oct 2021 21:27:33 +0200	[thread overview]
Message-ID: <20211004192741.621870-3-marijn.suijten@somainline.org> (raw)
In-Reply-To: <20211004192741.621870-1-marijn.suijten@somainline.org>

The kernel already provides appropriate primitives to perform endianness
conversion which should be used in favour of manual bit-wrangling.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
---
 drivers/video/backlight/qcom-wled.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 6af808af2328..9927ed98944a 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -231,14 +231,14 @@ struct wled {
 static int wled3_set_brightness(struct wled *wled, u16 brightness)
 {
 	int rc, i;
-	u8 v[2];
+	u16 v;
 
-	v[0] = brightness & 0xff;
-	v[1] = (brightness >> 8) & 0xf;
+	v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
 
 	for (i = 0;  i < wled->cfg.num_strings; ++i) {
 		rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
-				       WLED3_SINK_REG_BRIGHT(i), v, 2);
+				       WLED3_SINK_REG_BRIGHT(i),
+				       &v, sizeof(v));
 		if (rc < 0)
 			return rc;
 	}
@@ -249,19 +249,18 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
 static int wled4_set_brightness(struct wled *wled, u16 brightness)
 {
 	int rc, i;
-	u16 low_limit = wled->max_brightness * 4 / 1000;
-	u8 v[2];
+	u16 v, low_limit = wled->max_brightness * 4 / 1000;
 
 	/* WLED4's lower limit of operation is 0.4% */
 	if (brightness > 0 && brightness < low_limit)
 		brightness = low_limit;
 
-	v[0] = brightness & 0xff;
-	v[1] = (brightness >> 8) & 0xf;
+	v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
 
 	for (i = 0;  i < wled->cfg.num_strings; ++i) {
 		rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
-				       WLED4_SINK_REG_BRIGHT(i), v, 2);
+				       WLED4_SINK_REG_BRIGHT(i),
+				       &v, sizeof(v));
 		if (rc < 0)
 			return rc;
 	}
@@ -272,22 +271,20 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness)
 static int wled5_set_brightness(struct wled *wled, u16 brightness)
 {
 	int rc, offset;
-	u16 low_limit = wled->max_brightness * 1 / 1000;
-	u8 v[2];
+	u16 v, low_limit = wled->max_brightness * 1 / 1000;
 
 	/* WLED5's lower limit is 0.1% */
 	if (brightness < low_limit)
 		brightness = low_limit;
 
-	v[0] = brightness & 0xff;
-	v[1] = (brightness >> 8) & 0x7f;
+	v = cpu_to_le16(brightness & WLED5_SINK_REG_BRIGHT_MAX_15B);
 
 	offset = (wled->cfg.mod_sel == MOD_A) ?
 		  WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB :
 		  WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB;
 
 	rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
-			       v, 2);
+			       &v, sizeof(v));
 	return rc;
 }
 
-- 
2.33.0


  parent reply	other threads:[~2021-10-04 19:27 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-04 19:27 [PATCH 00/10] backlight: qcom-wled: fix and solidify handling of enabled-strings Marijn Suijten
2021-10-04 19:27 ` [PATCH 01/10] backlight: qcom-wled: Pass number of elements to read to read_u32_array Marijn Suijten
2021-10-05  9:05   ` Daniel Thompson
2021-10-04 19:27 ` Marijn Suijten [this message]
2021-10-05  9:06   ` [PATCH 02/10] backlight: qcom-wled: Use cpu_to_le16 macro to perform conversion Daniel Thompson
2021-10-04 19:27 ` [PATCH 03/10] backlight: qcom-wled: Override num-strings when enabled-strings is set Marijn Suijten
2021-10-05  9:38   ` Daniel Thompson
2021-10-04 19:27 ` [PATCH 04/10] backlight: qcom-wled: Validate enabled string indices in DT Marijn Suijten
2021-10-05  9:14   ` Daniel Thompson
2021-10-05 10:03     ` Marijn Suijten
2021-10-05 10:42       ` Daniel Thompson
2021-10-04 19:27 ` [PATCH 05/10] backlight: qcom-wled: Fix off-by-one maximum with default num_strings Marijn Suijten
2021-10-05  9:19   ` Daniel Thompson
2021-10-05 10:06     ` Marijn Suijten
2021-10-05 10:38       ` Daniel Thompson
2021-10-05 10:53         ` Daniel Thompson
2021-10-05 11:44           ` Marijn Suijten
2021-10-05 14:03             ` Daniel Thompson
2021-10-05 15:23               ` Marijn Suijten
2021-10-05 16:24                 ` Daniel Thompson
2021-10-05 16:50                   ` Konrad Dybcio
2021-10-05 17:34                   ` Marijn Suijten
2021-10-06 14:44                     ` Daniel Thompson
2021-10-07 21:28                       ` Marijn Suijten
2021-10-04 19:27 ` [PATCH 06/10] backlight: qcom-wled: Remove unnecessary 4th default string in wled3 Marijn Suijten
2021-10-05  9:20   ` Daniel Thompson
2021-10-04 19:27 ` [PATCH 07/10] backlight: qcom-wled: Provide enabled_strings default for wled 4 and 5 Marijn Suijten
2021-10-05  9:21   ` Daniel Thompson
2021-10-04 19:27 ` [PATCH 08/10] backlight: qcom-wled: Remove unnecessary double whitespace Marijn Suijten
2021-10-05  9:21   ` Daniel Thompson
2021-10-04 19:27 ` [PATCH 09/10] backlight: qcom-wled: Consistently use enabled-strings in set_brightness Marijn Suijten
2021-10-05  9:33   ` Daniel Thompson
2021-10-05 10:12     ` Marijn Suijten
2021-10-04 19:27 ` [PATCH 10/10] backlight: qcom-wled: Consider enabled_strings in autodetection Marijn Suijten

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