From patchwork Fri Jul 23 08:16:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Billy Tsai X-Patchwork-Id: 12395513 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=-13.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 BE05FC4338F for ; Fri, 23 Jul 2021 08:16:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A92F260F02 for ; Fri, 23 Jul 2021 08:16:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234313AbhGWHfy (ORCPT ); Fri, 23 Jul 2021 03:35:54 -0400 Received: from twspam01.aspeedtech.com ([211.20.114.71]:30010 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234307AbhGWHfx (ORCPT ); Fri, 23 Jul 2021 03:35:53 -0400 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 16N7x7uR041953; Fri, 23 Jul 2021 15:59:07 +0800 (GMT-8) (envelope-from billy_tsai@aspeedtech.com) Received: from BillyTsai-pc.aspeed.com (192.168.2.149) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 23 Jul 2021 16:15:41 +0800 From: Billy Tsai To: , , , , , , , , , , , CC: Subject: [v2 8/8] iio: adc: aspeed: Support battery sensing. Date: Fri, 23 Jul 2021 16:16:21 +0800 Message-ID: <20210723081621.29477-9-billy_tsai@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210723081621.29477-1-billy_tsai@aspeedtech.com> References: <20210723081621.29477-1-billy_tsai@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.149] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 16N7x7uR041953 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org In ast2600, ADC integrate dividing circuit at last input channel for battery sensing. This patch use the dts property "battery-sensing" to enable this feature makes the last channel of each adc can tolerance higher voltage than reference voltage. Signed-off-by: Billy Tsai --- drivers/iio/adc/aspeed_adc.c | 60 +++++++++++++++++++++++++++++++++--- 1 file changed, 55 insertions(+), 5 deletions(-) diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c index 7e674b607e36..6c7e2bb7b1ac 100644 --- a/drivers/iio/adc/aspeed_adc.c +++ b/drivers/iio/adc/aspeed_adc.c @@ -45,6 +45,9 @@ #define ASPEED_ADC_REF_VOLTAGE_1200mV FIELD_PREP(ASPEED_ADC_REF_VOLTAGE, 1) #define ASPEED_ADC_REF_VOLTAGE_EXT_HIGH FIELD_PREP(ASPEED_ADC_REF_VOLTAGE, 2) #define ASPEED_ADC_REF_VOLTAGE_EXT_LOW FIELD_PREP(ASPEED_ADC_REF_VOLTAGE, 3) +#define ASPEED_ADC_BATTERY_SENSING_DIV BIT(6) +#define ASPEED_ADC_BATTERY_SENSING_DIV_2_3 FIELD_PREP(ASPEED_ADC_BATTERY_SENSING_DIV, 0) +#define ASPEED_ADC_BATTERY_SENSING_DIV_1_3 FIELD_PREP(ASPEED_ADC_BATTERY_SENSING_DIV, 1) #define ASPEED_ADC_CTRL_INIT_RDY BIT(8) #define ASPEED_ADC_CH7_MODE BIT(12) #define ASPEED_ADC_CH7_NORMAL FIELD_PREP(ASPEED_ADC_CH7_MODE, 0) @@ -76,6 +79,11 @@ struct aspeed_adc_model_data { unsigned int num_channels; }; +struct adc_gain { + u8 mult; + u8 div; +}; + struct aspeed_adc_data { struct device *dev; void __iomem *base; @@ -87,6 +95,8 @@ struct aspeed_adc_data { int vref; u32 sample_period_ns; int cv; + bool battery_sensing; + struct adc_gain battery_mode_gain; }; #define ASPEED_CHAN(_idx, _data_reg_addr) { \ @@ -185,14 +195,38 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct aspeed_adc_data *data = iio_priv(indio_dev); + u32 adc_engine_control_reg_val; switch (mask) { case IIO_CHAN_INFO_RAW: - *val = readw(data->base + chan->address) + data->cv; - if (*val < 0) - *val = 0; - else if (*val >= ASPEED_ADC_MAX_RAW_DATA) - *val = ASPEED_ADC_MAX_RAW_DATA; + if (data->battery_sensing && chan->channel == 7) { + adc_engine_control_reg_val = + readl(data->base + ASPEED_REG_ENGINE_CONTROL); + writel(adc_engine_control_reg_val | + ASPEED_ADC_CH7_BATTERY | + ASPEED_ADC_BATTERY_SENSING_ENABLE, + data->base + ASPEED_REG_ENGINE_CONTROL); + /* + * After enable battery sensing mode need to wait some time for adc stable + * Experiment result is 1ms. + */ + mdelay(1); + *val = readw(data->base + chan->address) + data->cv; + if (*val < 0) + *val = 0; + else if (*val >= ASPEED_ADC_MAX_RAW_DATA) + *val = ASPEED_ADC_MAX_RAW_DATA; + *val = (*val * data->battery_mode_gain.mult) / + data->battery_mode_gain.div; + writel(adc_engine_control_reg_val, + data->base + ASPEED_REG_ENGINE_CONTROL); + } else { + *val = readw(data->base + chan->address) + data->cv; + if (*val < 0) + *val = 0; + else if (*val >= ASPEED_ADC_MAX_RAW_DATA) + *val = ASPEED_ADC_MAX_RAW_DATA; + } return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: @@ -392,6 +426,22 @@ static int aspeed_adc_probe(struct platform_device *pdev) if (ret) goto vref_config_error; + if (of_find_property(data->dev->of_node, "battery-sensing", NULL)) { + if (model_data->version >= aspeed_adc_ast2600) { + data->battery_sensing = 1; + if (readl(data->base + ASPEED_REG_ENGINE_CONTROL) & + ASPEED_ADC_BATTERY_SENSING_DIV_1_3) { + data->battery_mode_gain.mult = 3; + data->battery_mode_gain.div = 1; + } else { + data->battery_mode_gain.mult = 3; + data->battery_mode_gain.div = 2; + } + } else + dev_warn(&pdev->dev, + "Failed to enable battey-sensing mode\n"); + } + if (model_data->wait_init_sequence) { adc_engine_control_reg_val = readl(data->base + ASPEED_REG_ENGINE_CONTROL);