From patchwork Tue Nov 21 20:28:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Rokosov X-Patchwork-Id: 745935 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="u2t5LGj8" Received: from mx1.sberdevices.ru (mx2.sberdevices.ru [45.89.224.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A37001A2; Tue, 21 Nov 2023 12:28:51 -0800 (PST) Received: from p-infra-ksmg-sc-msk02 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 0E32312005C; Tue, 21 Nov 2023 23:28:50 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 0E32312005C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1700598530; bh=UOxTU5KZHbe/+hSkVYfZqZlG2Efk3Ixj1Eia0Y3j9EI=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=u2t5LGj8+aAaYRkMbfSvRoBaOwZKeEGe2SK5z3PygnwhvPw5jvMfkeAgQIrQPZGY1 vYw8eVpv4ZHKHF9bDNm5nRD6792z9AYNZdgFE0yO32X2Q+W9uBZV/N5W2YD5tXOFwU LGo3cveyGBOZnM6WXH/Z8CsOUYhEncjla2ZfOtvPYpYRHl+WyexPvFXHKGzceP9equ ZpN2GczuL1mrskBpz3WSA7gOyht/Oabwxs3ebKFcpf7Hgj4zkgySIsk1947cmHMI3Y 67UQbTBAzM+b70IxDGy23UM5LHo0CWVA099XgzsabJWaacJIJI9A9s3jDUgARwLIDZ QrZHleHZK3v6w== Received: from p-i-exch-sc-m01.sberdevices.ru (p-i-exch-sc-m01.sberdevices.ru [172.16.192.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.sberdevices.ru (Postfix) with ESMTPS; Tue, 21 Nov 2023 23:28:49 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 21 Nov 2023 23:28:49 +0300 From: Dmitry Rokosov To: , , , , , CC: , , , , , Dmitry Rokosov Subject: [PATCH v4 02/11] leds: aw200xx: support HWEN hardware control Date: Tue, 21 Nov 2023 23:28:26 +0300 Message-ID: <20231121202835.28152-3-ddrokosov@salutedevices.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20231121202835.28152-1-ddrokosov@salutedevices.com> References: <20231121202835.28152-1-ddrokosov@salutedevices.com> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181514 [Nov 21 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: ddrokosov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 3 0.3.3 e5c6a18a9a9bff0226d530c5b790210c0bd117c8, {Tracking_from_domain_doesnt_match_to}, 100.64.160.123:7.1.2; 127.0.0.199:7.1.2; p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1; salutedevices.com:7.1.1; d41d8cd98f00b204e9800998ecf8427e.com:7.1.1, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/21 17:47:00 #22495004 X-KSMG-AntiVirus-Status: Clean, skipped HWEN is hardware control, which is used for enable/disable aw200xx chip. It's high active, internally pulled down to GND. After HWEN pin set high the chip begins to load the OTP information, which takes 200us to complete. About 200us wait time is needed for internal oscillator startup and display SRAM initialization. After display SRAM initialization, the registers in page 1 to page 5 can be configured via i2c interface. Signed-off-by: Dmitry Rokosov Reviewed-by: Andy Shevchenko --- drivers/leds/leds-aw200xx.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c index 842a22087b16..7762b3a132ac 100644 --- a/drivers/leds/leds-aw200xx.c +++ b/drivers/leds/leds-aw200xx.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -116,6 +117,7 @@ struct aw200xx { struct mutex mutex; u32 num_leds; u32 display_rows; + struct gpio_desc *hwen; struct aw200xx_led leds[] __counted_by(num_leds); }; @@ -358,6 +360,25 @@ static int aw200xx_chip_check(const struct aw200xx *const chip) return 0; } +static void aw200xx_enable(const struct aw200xx *const chip) +{ + gpiod_set_value_cansleep(chip->hwen, 1); + + /* + * After HWEN pin set high the chip begins to load the OTP information, + * which takes 200us to complete. About 200us wait time is needed for + * internal oscillator startup and display SRAM initialization. After + * display SRAM initialization, the registers in page1 to page5 can be + * configured via i2c interface. + */ + fsleep(400); +} + +static void aw200xx_disable(const struct aw200xx *const chip) +{ + return gpiod_set_value_cansleep(chip->hwen, 0); +} + static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip) { struct fwnode_handle *child; @@ -517,6 +538,14 @@ static int aw200xx_probe(struct i2c_client *client) if (IS_ERR(chip->regmap)) return PTR_ERR(chip->regmap); + chip->hwen = devm_gpiod_get_optional(&client->dev, "enable", + GPIOD_OUT_HIGH); + if (IS_ERR(chip->hwen)) + return dev_err_probe(&client->dev, PTR_ERR(chip->hwen), + "Cannot get enable gpio"); + + aw200xx_enable(chip); + ret = aw200xx_chip_check(chip); if (ret) return ret; @@ -537,6 +566,9 @@ static int aw200xx_probe(struct i2c_client *client) ret = aw200xx_chip_init(chip); out_unlock: + if (ret) + aw200xx_disable(chip); + mutex_unlock(&chip->mutex); return ret; } @@ -546,6 +578,7 @@ static void aw200xx_remove(struct i2c_client *client) struct aw200xx *chip = i2c_get_clientdata(client); aw200xx_chip_reset(chip); + aw200xx_disable(chip); mutex_destroy(&chip->mutex); }