From patchwork Tue Apr 4 12:08:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 9661459 X-Patchwork-Delegate: agross@codeaurora.org Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 251CC602B9 for ; Tue, 4 Apr 2017 12:08:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0EC4A24560 for ; Tue, 4 Apr 2017 12:08:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0106328502; Tue, 4 Apr 2017 12:08:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 49E0124560 for ; Tue, 4 Apr 2017 12:08:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752943AbdDDMIc (ORCPT ); Tue, 4 Apr 2017 08:08:32 -0400 Received: from mail-lf0-f49.google.com ([209.85.215.49]:33798 "EHLO mail-lf0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753107AbdDDMIa (ORCPT ); Tue, 4 Apr 2017 08:08:30 -0400 Received: by mail-lf0-f49.google.com with SMTP id z15so91486279lfd.1 for ; Tue, 04 Apr 2017 05:08:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=x1+/rSRAsTv3bUpvdPXaRv0AWsCx92ygC9lQaA9RQxc=; b=Nz1YeF+EApjbTabkGBRpM4ui7Kty9wwUZZ+OJNLE22oYu9h+zsXMd7PBhjGPzlwDrk tgGHalU/CPpa1EsID0T6VTsNLv3S/6qg/njEx+6uv84H8f9etYageJVG0zb8j7WmT47t pyG4RUpbq8049vk7USBV/DAoTFldcS3xlPSJ8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=x1+/rSRAsTv3bUpvdPXaRv0AWsCx92ygC9lQaA9RQxc=; b=b2sSPmTTVrJELq5M9nXmYpV01ReHiLAjqS43pECD8TygHvzrycmlOWaGKUyBTdcN7w SLmKqdHzK3wbIj68A23g036/FhaiET/aEZGJV7i7B1fGmUYT9IdlK3eTDw5IJoSOoQBH RdU5W3XU/6rkY7Oxvj7erzrOEH1DqE/fcC5E74AwnFWx8uiw99q+YCRpLnJY0WgsvZWW R7iyhQdQraDQfJXPzUmes0NIkYQndNytbL3ilFxOitZDlYAK5r7EA6z10XW2wloLsSHl P8fnelegk76Ppb6cjH+cyauhvF/bd/Cm4/s72zMJ/WMn5pahhGJ6yte8XQJkSugLWT8I zkHg== X-Gm-Message-State: AFeK/H3YGA78YrThu5hR5mPEXjlVIx9EdGJEWma5PGeaPuGbr2gQK7AcdWvHhiVBzvFAA+uF X-Received: by 10.46.9.4 with SMTP id 4mr6829034ljj.23.1491307708694; Tue, 04 Apr 2017 05:08:28 -0700 (PDT) Received: from genomnajs.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id l2sm3046774lfe.69.2017.04.04.05.08.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Apr 2017 05:08:27 -0700 (PDT) From: Linus Walleij To: Jonathan Cameron , linux-iio@vger.kernel.org Cc: Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, "Ivan T . Ivanov" , Andy Gross , Bjorn Andersson , Stephen Boyd , Srinivas Kandagatla , Rama Krishna Phani A Subject: [PATCH 2/3 v5] iio: adc: break out common code from SPMI VADC Date: Tue, 4 Apr 2017 14:08:18 +0200 Message-Id: <20170404120819.6921-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170404120819.6921-1-linus.walleij@linaro.org> References: <20170404120819.6921-1-linus.walleij@linaro.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The SPMI VADC and the earlier XOADC share a subset of common code, so to be able to use the same code in both drivers, we break out a separate file with the common code, prefix exported functions that are no longer static with qcom_* and bake an object qcom-spmi-vadc.o that contains both files: qcom-vadc-common.o and qcom-spmi-vadc-core.o. As we need to follow the procedure for making a kernel module or compiled in object from several files, but still want to produce the same module name, rename the qcom-spmi-vadc.c file to qcom-spmi-vadc-core.c so we can bake the two objects into qcom-spmi-vadc.o Cc: linux-arm-kernel@lists.infradead.org Cc: linux-arm-msm@vger.kernel.org Cc: Ivan T. Ivanov Cc: Andy Gross Cc: Bjorn Andersson Cc: Stephen Boyd Cc: Srinivas Kandagatla Cc: Rama Krishna Phani A Signed-off-by: Linus Walleij --- ChangeLog v4->v5: - Fix kernel build again. Give up and create a helper module with EXPORT_SYMBOL() functions. It works for allyes and allmod, finally. YES I TESTED IT THOROUGHLY: x86_64 allmodconfig: CC [M] kernel/configs.o CC [M] drivers/iio/adc/qcom-vadc-common.o CC [M] drivers/iio/adc/qcom-spmi-vadc.o CC [M] drivers/iio/adc/qcom-pm8xxx-xoadc.o Building modules, stage 2. MODPOST 6247 modules CC drivers/iio/adc/qcom-pm8xxx-xoadc.mod.o CC drivers/iio/adc/qcom-vadc-common.mod.o CC drivers/iio/adc/qcom-spmi-vadc.mod.o CC kernel/configs.mod.o LD [M] drivers/iio/adc/qcom-pm8xxx-xoadc.ko LD [M] drivers/iio/adc/qcom-spmi-vadc.ko LD [M] drivers/iio/adc/qcom-vadc-common.ko LD [M] kernel/configs.ko x86_64 allyesconfig: CC drivers/iio/adc/qcom-vadc-common.o CC drivers/iio/adc/qcom-spmi-vadc.o CC drivers/iio/adc/qcom-pm8xxx-xoadc.o LD drivers/iio/adc/built-in.o LD drivers/iio/built-in.o LD vmlinux.o MODPOST vmlinux.o KSYM .tmp_kallsyms1.o KSYM .tmp_kallsyms2.o LD vmlinux So help me God. And sorry for wasting so much of your time with these build issues. :( :( :( - Missing inclusion guard in the .h file. ChangeLog v3->v4: - Fix up the kernel build, tested with allyes and allmod. ChangeLog v2->v3: - Rewrite on top of Rama Krishna's changes. Now we use the generic channel properties, calibration graph and prescale settings in all VADC drivers. I did away with the vtable indirection which I just don't see the point of, it's better to just pass the type of conversion function around and have a switch case select the conversion. It was done like that in the vendor tree but it's not a good idea. ChangeLog v1->v2: - No changes just reposting --- drivers/iio/adc/Kconfig | 4 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/qcom-spmi-vadc.c | 325 ++----------------------------------- drivers/iio/adc/qcom-vadc-common.c | 230 ++++++++++++++++++++++++++ drivers/iio/adc/qcom-vadc-common.h | 108 ++++++++++++ 5 files changed, 358 insertions(+), 310 deletions(-) create mode 100644 drivers/iio/adc/qcom-vadc-common.c create mode 100644 drivers/iio/adc/qcom-vadc-common.h diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index dedae7adbce9..8720e1c706fe 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -442,6 +442,9 @@ config PALMAS_GPADC is used in smartphones and tablets and supports a 16 channel general purpose ADC. +config QCOM_VADC_COMMON + tristate + config QCOM_SPMI_IADC tristate "Qualcomm SPMI PMIC current ADC" depends on SPMI @@ -460,6 +463,7 @@ config QCOM_SPMI_VADC tristate "Qualcomm SPMI PMIC voltage ADC" depends on SPMI select REGMAP_SPMI + select QCOM_VADC_COMMON help This is the IIO Voltage ADC driver for Qualcomm QPNP VADC Chip. diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index d0012620cd1c..8c2e294042ae 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o obj-$(CONFIG_NAU7802) += nau7802.o obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o +obj-$(CONFIG_QCOM_VADC_COMMON) += qcom-vadc-common.o obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c index 0a19761d656c..9e600bfd1765 100644 --- a/drivers/iio/adc/qcom-spmi-vadc.c +++ b/drivers/iio/adc/qcom-spmi-vadc.c @@ -28,6 +28,8 @@ #include +#include "qcom-vadc-common.h" + /* VADC register and bit definitions */ #define VADC_REVISION2 0x1 #define VADC_REVISION2_SUPPORTED_VADC 1 @@ -75,84 +77,10 @@ #define VADC_DATA 0x60 /* 16 bits */ -#define VADC_CONV_TIME_MIN_US 2000 -#define VADC_CONV_TIME_MAX_US 2100 - -/* Min ADC code represents 0V */ -#define VADC_MIN_ADC_CODE 0x6000 -/* Max ADC code represents full-scale range of 1.8V */ -#define VADC_MAX_ADC_CODE 0xa800 - -#define VADC_ABSOLUTE_RANGE_UV 625000 -#define VADC_RATIOMETRIC_RANGE 1800 - -#define VADC_DEF_PRESCALING 0 /* 1:1 */ -#define VADC_DEF_DECIMATION 0 /* 512 */ -#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */ -#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */ -#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE - -#define VADC_DECIMATION_MIN 512 -#define VADC_DECIMATION_MAX 4096 - -#define VADC_HW_SETTLE_DELAY_MAX 10000 -#define VADC_AVG_SAMPLES_MAX 512 - -#define KELVINMIL_CELSIUSMIL 273150 - -#define PMI_CHG_SCALE_1 -138890 -#define PMI_CHG_SCALE_2 391750000000LL - #define VADC_CHAN_MIN VADC_USBIN #define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM /** - * struct vadc_map_pt - Map the graph representation for ADC channel - * @x: Represent the ADC digitized code. - * @y: Represent the physical data which can be temperature, voltage, - * resistance. - */ -struct vadc_map_pt { - s32 x; - s32 y; -}; - -/* - * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels. - * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for - * calibration. - */ -enum vadc_calibration { - VADC_CALIB_ABSOLUTE = 0, - VADC_CALIB_RATIOMETRIC -}; - -/** - * struct vadc_linear_graph - Represent ADC characteristics. - * @dy: numerator slope to calculate the gain. - * @dx: denominator slope to calculate the gain. - * @gnd: A/D word of the ground reference used for the channel. - * - * Each ADC device has different offset and gain parameters which are - * computed to calibrate the device. - */ -struct vadc_linear_graph { - s32 dy; - s32 dx; - s32 gnd; -}; - -/** - * struct vadc_prescale_ratio - Represent scaling ratio for ADC input. - * @num: the inverse numerator of the gain applied to the input channel. - * @den: the inverse denominator of the gain applied to the input channel. - */ -struct vadc_prescale_ratio { - u32 num; - u32 den; -}; - -/** * struct vadc_channel_prop - VADC channel property. * @channel: channel number, refer to the channel list. * @calibration: calibration type. @@ -162,9 +90,8 @@ struct vadc_prescale_ratio { * start of conversion. * @avg_samples: ability to provide single result from the ADC * that is an average of multiple measurements. - * @scale_fn: Represents the scaling function to convert voltage + * @scale_fn_type: Represents the scaling function to convert voltage * physical units desired by the client for the channel. - * Referenced from enum vadc_scale_fn_type. */ struct vadc_channel_prop { unsigned int channel; @@ -173,7 +100,7 @@ struct vadc_channel_prop { unsigned int prescale; unsigned int hw_settle_time; unsigned int avg_samples; - unsigned int scale_fn; + enum vadc_scale_fn_type scale_fn_type; }; /** @@ -204,35 +131,6 @@ struct vadc_priv { struct mutex lock; }; -/** - * struct vadc_scale_fn - Scaling function prototype - * @scale: Function pointer to one of the scaling functions - * which takes the adc properties, channel properties, - * and returns the physical result. - */ -struct vadc_scale_fn { - int (*scale)(struct vadc_priv *, const struct vadc_channel_prop *, - u16, int *); -}; - -/** - * enum vadc_scale_fn_type - Scaling function to convert ADC code to - * physical scaled units for the channel. - * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV). - * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC. - * Uses a mapping table with 100K pullup. - * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade. - * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC. - * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp - */ -enum vadc_scale_fn_type { - SCALE_DEFAULT = 0, - SCALE_THERM_100K_PULLUP, - SCALE_PMIC_THERM, - SCALE_XOTHERM, - SCALE_PMI_CHG_TEMP, -}; - static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { {.num = 1, .den = 1}, {.num = 1, .den = 3}, @@ -244,44 +142,6 @@ static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { {.num = 1, .den = 10} }; -/* Voltage to temperature */ -static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = { - {1758, -40}, - {1742, -35}, - {1719, -30}, - {1691, -25}, - {1654, -20}, - {1608, -15}, - {1551, -10}, - {1483, -5}, - {1404, 0}, - {1315, 5}, - {1218, 10}, - {1114, 15}, - {1007, 20}, - {900, 25}, - {795, 30}, - {696, 35}, - {605, 40}, - {522, 45}, - {448, 50}, - {383, 55}, - {327, 60}, - {278, 65}, - {237, 70}, - {202, 75}, - {172, 80}, - {146, 85}, - {125, 90}, - {107, 95}, - {92, 100}, - {79, 105}, - {68, 110}, - {59, 115}, - {51, 120}, - {44, 125} -}; - static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data) { return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1); @@ -553,159 +413,6 @@ static int vadc_measure_ref_points(struct vadc_priv *vadc) return ret; } -static int vadc_map_voltage_temp(const struct vadc_map_pt *pts, - u32 tablesize, s32 input, s64 *output) -{ - bool descending = 1; - u32 i = 0; - - if (!pts) - return -EINVAL; - - /* Check if table is descending or ascending */ - if (tablesize > 1) { - if (pts[0].x < pts[1].x) - descending = 0; - } - - while (i < tablesize) { - if ((descending) && (pts[i].x < input)) { - /* table entry is less than measured*/ - /* value and table is descending, stop */ - break; - } else if ((!descending) && - (pts[i].x > input)) { - /* table entry is greater than measured*/ - /*value and table is ascending, stop */ - break; - } - i++; - } - - if (i == 0) { - *output = pts[0].y; - } else if (i == tablesize) { - *output = pts[tablesize - 1].y; - } else { - /* result is between search_index and search_index-1 */ - /* interpolate linearly */ - *output = (((s32)((pts[i].y - pts[i - 1].y) * - (input - pts[i - 1].x)) / - (pts[i].x - pts[i - 1].x)) + - pts[i - 1].y); - } - - return 0; -} - -static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code, - const struct vadc_channel_prop *prop, - s64 *scale_voltage) -{ - *scale_voltage = (adc_code - - vadc->graph[prop->calibration].gnd); - *scale_voltage *= vadc->graph[prop->calibration].dx; - *scale_voltage = div64_s64(*scale_voltage, - vadc->graph[prop->calibration].dy); - if (prop->calibration == VADC_CALIB_ABSOLUTE) - *scale_voltage += - vadc->graph[prop->calibration].dx; - - if (*scale_voltage < 0) - *scale_voltage = 0; -} - -static int vadc_scale_volt(struct vadc_priv *vadc, - const struct vadc_channel_prop *prop, u16 adc_code, - int *result_uv) -{ - const struct vadc_prescale_ratio *prescale; - s64 voltage = 0, result = 0; - - vadc_scale_calib(vadc, adc_code, prop, &voltage); - - prescale = &vadc_prescale_ratios[prop->prescale]; - voltage = voltage * prescale->den; - result = div64_s64(voltage, prescale->num); - *result_uv = result; - - return 0; -} - -static int vadc_scale_therm(struct vadc_priv *vadc, - const struct vadc_channel_prop *prop, u16 adc_code, - int *result_mdec) -{ - s64 voltage = 0, result = 0; - - vadc_scale_calib(vadc, adc_code, prop, &voltage); - - if (prop->calibration == VADC_CALIB_ABSOLUTE) - voltage = div64_s64(voltage, 1000); - - vadc_map_voltage_temp(adcmap_100k_104ef_104fb, - ARRAY_SIZE(adcmap_100k_104ef_104fb), - voltage, &result); - result *= 1000; - *result_mdec = result; - - return 0; -} - -static int vadc_scale_die_temp(struct vadc_priv *vadc, - const struct vadc_channel_prop *prop, - u16 adc_code, int *result_mdec) -{ - const struct vadc_prescale_ratio *prescale; - s64 voltage = 0; - u64 temp; /* Temporary variable for do_div */ - - vadc_scale_calib(vadc, adc_code, prop, &voltage); - - if (voltage > 0) { - prescale = &vadc_prescale_ratios[prop->prescale]; - temp = voltage * prescale->den; - do_div(temp, prescale->num * 2); - voltage = temp; - } else { - voltage = 0; - } - - voltage -= KELVINMIL_CELSIUSMIL; - *result_mdec = voltage; - - return 0; -} - -static int vadc_scale_chg_temp(struct vadc_priv *vadc, - const struct vadc_channel_prop *prop, - u16 adc_code, int *result_mdec) -{ - const struct vadc_prescale_ratio *prescale; - s64 voltage = 0, result = 0; - - vadc_scale_calib(vadc, adc_code, prop, &voltage); - - prescale = &vadc_prescale_ratios[prop->prescale]; - voltage = voltage * prescale->den; - voltage = div64_s64(voltage, prescale->num); - voltage = ((PMI_CHG_SCALE_1) * (voltage * 2)); - voltage = (voltage + PMI_CHG_SCALE_2); - result = div64_s64(voltage, 1000000); - *result_mdec = result; - - return 0; -} - -static int vadc_decimation_from_dt(u32 value) -{ - if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN || - value > VADC_DECIMATION_MAX) - return -EINVAL; - - return __ffs64(value / VADC_DECIMATION_MIN); -} - static int vadc_prescaling_from_dt(u32 num, u32 den) { unsigned int pre; @@ -742,14 +449,6 @@ static int vadc_avg_samples_from_dt(u32 value) return __ffs64(value); } -static struct vadc_scale_fn scale_fn[] = { - [SCALE_DEFAULT] = {vadc_scale_volt}, - [SCALE_THERM_100K_PULLUP] = {vadc_scale_therm}, - [SCALE_PMIC_THERM] = {vadc_scale_die_temp}, - [SCALE_XOTHERM] = {vadc_scale_therm}, - [SCALE_PMI_CHG_TEMP] = {vadc_scale_chg_temp}, -}; - static int vadc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -766,7 +465,13 @@ static int vadc_read_raw(struct iio_dev *indio_dev, if (ret) break; - scale_fn[prop->scale_fn].scale(vadc, prop, adc_code, val); + ret = qcom_vadc_scale(prop->scale_fn_type, + &vadc->graph[prop->calibration], + &vadc_prescale_ratios[prop->prescale], + (prop->calibration == VADC_CALIB_ABSOLUTE), + adc_code, val); + if (ret) + break; return IIO_VAL_INT; case IIO_CHAN_INFO_RAW: @@ -809,7 +514,7 @@ struct vadc_channels { unsigned int prescale_index; enum iio_chan_type type; long info_mask; - unsigned int scale_fn; + enum vadc_scale_fn_type scale_fn_type; }; #define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \ @@ -818,7 +523,7 @@ struct vadc_channels { .prescale_index = _pre, \ .type = _type, \ .info_mask = _mask, \ - .scale_fn = _scale \ + .scale_fn_type = _scale \ }, \ #define VADC_NO_CHAN(_dname, _type, _mask, _pre) \ @@ -976,7 +681,7 @@ static int vadc_get_dt_channel_data(struct device *dev, ret = of_property_read_u32(node, "qcom,decimation", &value); if (!ret) { - ret = vadc_decimation_from_dt(value); + ret = qcom_vadc_decimation_from_dt(value); if (ret < 0) { dev_err(dev, "%02x invalid decimation %d\n", chan, value); @@ -1068,7 +773,7 @@ static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node) return ret; } - prop.scale_fn = vadc_chans[prop.channel].scale_fn; + prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type; vadc->chan_props[index] = prop; vadc_chan = &vadc_chans[prop.channel]; diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c new file mode 100644 index 000000000000..102fc51b10aa --- /dev/null +++ b/drivers/iio/adc/qcom-vadc-common.c @@ -0,0 +1,230 @@ +#include +#include +#include +#include +#include +#include + +#include "qcom-vadc-common.h" + +/* Voltage to temperature */ +static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = { + {1758, -40}, + {1742, -35}, + {1719, -30}, + {1691, -25}, + {1654, -20}, + {1608, -15}, + {1551, -10}, + {1483, -5}, + {1404, 0}, + {1315, 5}, + {1218, 10}, + {1114, 15}, + {1007, 20}, + {900, 25}, + {795, 30}, + {696, 35}, + {605, 40}, + {522, 45}, + {448, 50}, + {383, 55}, + {327, 60}, + {278, 65}, + {237, 70}, + {202, 75}, + {172, 80}, + {146, 85}, + {125, 90}, + {107, 95}, + {92, 100}, + {79, 105}, + {68, 110}, + {59, 115}, + {51, 120}, + {44, 125} +}; + +static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts, + u32 tablesize, s32 input, s64 *output) +{ + bool descending = 1; + u32 i = 0; + + if (!pts) + return -EINVAL; + + /* Check if table is descending or ascending */ + if (tablesize > 1) { + if (pts[0].x < pts[1].x) + descending = 0; + } + + while (i < tablesize) { + if ((descending) && (pts[i].x < input)) { + /* table entry is less than measured*/ + /* value and table is descending, stop */ + break; + } else if ((!descending) && + (pts[i].x > input)) { + /* table entry is greater than measured*/ + /*value and table is ascending, stop */ + break; + } + i++; + } + + if (i == 0) { + *output = pts[0].y; + } else if (i == tablesize) { + *output = pts[tablesize - 1].y; + } else { + /* result is between search_index and search_index-1 */ + /* interpolate linearly */ + *output = (((s32)((pts[i].y - pts[i - 1].y) * + (input - pts[i - 1].x)) / + (pts[i].x - pts[i - 1].x)) + + pts[i - 1].y); + } + + return 0; +} + +static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph, + u16 adc_code, + bool absolute, + s64 *scale_voltage) +{ + *scale_voltage = (adc_code - calib_graph->gnd); + *scale_voltage *= calib_graph->dx; + *scale_voltage = div64_s64(*scale_voltage, calib_graph->dy); + if (absolute) + *scale_voltage += calib_graph->dx; + + if (*scale_voltage < 0) + *scale_voltage = 0; +} + +static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, u16 adc_code, + int *result_uv) +{ + s64 voltage = 0, result = 0; + + qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); + + voltage = voltage * prescale->den; + result = div64_s64(voltage, prescale->num); + *result_uv = result; + + return 0; +} + +static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, u16 adc_code, + int *result_mdec) +{ + s64 voltage = 0, result = 0; + int ret; + + qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); + + if (absolute) + voltage = div64_s64(voltage, 1000); + + ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb, + ARRAY_SIZE(adcmap_100k_104ef_104fb), + voltage, &result); + if (ret) + return ret; + + result *= 1000; + *result_mdec = result; + + return 0; +} + +static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, + u16 adc_code, int *result_mdec) +{ + s64 voltage = 0; + u64 temp; /* Temporary variable for do_div */ + + qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); + + if (voltage > 0) { + temp = voltage * prescale->den; + do_div(temp, prescale->num * 2); + voltage = temp; + } else { + voltage = 0; + } + + voltage -= KELVINMIL_CELSIUSMIL; + *result_mdec = voltage; + + return 0; +} + +static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, + u16 adc_code, int *result_mdec) +{ + s64 voltage = 0, result = 0; + + qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage); + + voltage = voltage * prescale->den; + voltage = div64_s64(voltage, prescale->num); + voltage = ((PMI_CHG_SCALE_1) * (voltage * 2)); + voltage = (voltage + PMI_CHG_SCALE_2); + result = div64_s64(voltage, 1000000); + *result_mdec = result; + + return 0; +} + +int qcom_vadc_scale(enum vadc_scale_fn_type scaletype, + const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, + u16 adc_code, int *result) +{ + switch (scaletype) { + case SCALE_DEFAULT: + return qcom_vadc_scale_volt(calib_graph, prescale, + absolute, adc_code, + result); + case SCALE_THERM_100K_PULLUP: + case SCALE_XOTHERM: + return qcom_vadc_scale_therm(calib_graph, prescale, + absolute, adc_code, + result); + case SCALE_PMIC_THERM: + return qcom_vadc_scale_die_temp(calib_graph, prescale, + absolute, adc_code, + result); + case SCALE_PMI_CHG_TEMP: + return qcom_vadc_scale_chg_temp(calib_graph, prescale, + absolute, adc_code, + result); + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(qcom_vadc_scale); + +int qcom_vadc_decimation_from_dt(u32 value) +{ + if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN || + value > VADC_DECIMATION_MAX) + return -EINVAL; + + return __ffs64(value / VADC_DECIMATION_MIN); +} +EXPORT_SYMBOL(qcom_vadc_decimation_from_dt); diff --git a/drivers/iio/adc/qcom-vadc-common.h b/drivers/iio/adc/qcom-vadc-common.h new file mode 100644 index 000000000000..63c872a70adc --- /dev/null +++ b/drivers/iio/adc/qcom-vadc-common.h @@ -0,0 +1,108 @@ +/* + * Code shared between the different Qualcomm PMIC voltage ADCs + */ + +#ifndef QCOM_VADC_COMMON_H +#define QCOM_VADC_COMMON_H + +#define VADC_CONV_TIME_MIN_US 2000 +#define VADC_CONV_TIME_MAX_US 2100 + +/* Min ADC code represents 0V */ +#define VADC_MIN_ADC_CODE 0x6000 +/* Max ADC code represents full-scale range of 1.8V */ +#define VADC_MAX_ADC_CODE 0xa800 + +#define VADC_ABSOLUTE_RANGE_UV 625000 +#define VADC_RATIOMETRIC_RANGE 1800 + +#define VADC_DEF_PRESCALING 0 /* 1:1 */ +#define VADC_DEF_DECIMATION 0 /* 512 */ +#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */ +#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */ +#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE + +#define VADC_DECIMATION_MIN 512 +#define VADC_DECIMATION_MAX 4096 + +#define VADC_HW_SETTLE_DELAY_MAX 10000 +#define VADC_AVG_SAMPLES_MAX 512 + +#define KELVINMIL_CELSIUSMIL 273150 + +#define PMI_CHG_SCALE_1 -138890 +#define PMI_CHG_SCALE_2 391750000000LL + +/** + * struct vadc_map_pt - Map the graph representation for ADC channel + * @x: Represent the ADC digitized code. + * @y: Represent the physical data which can be temperature, voltage, + * resistance. + */ +struct vadc_map_pt { + s32 x; + s32 y; +}; + +/* + * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels. + * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for + * calibration. + */ +enum vadc_calibration { + VADC_CALIB_ABSOLUTE = 0, + VADC_CALIB_RATIOMETRIC +}; + +/** + * struct vadc_linear_graph - Represent ADC characteristics. + * @dy: numerator slope to calculate the gain. + * @dx: denominator slope to calculate the gain. + * @gnd: A/D word of the ground reference used for the channel. + * + * Each ADC device has different offset and gain parameters which are + * computed to calibrate the device. + */ +struct vadc_linear_graph { + s32 dy; + s32 dx; + s32 gnd; +}; + +/** + * struct vadc_prescale_ratio - Represent scaling ratio for ADC input. + * @num: the inverse numerator of the gain applied to the input channel. + * @den: the inverse denominator of the gain applied to the input channel. + */ +struct vadc_prescale_ratio { + u32 num; + u32 den; +}; + +/** + * enum vadc_scale_fn_type - Scaling function to convert ADC code to + * physical scaled units for the channel. + * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV). + * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC. + * Uses a mapping table with 100K pullup. + * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade. + * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC. + * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp + */ +enum vadc_scale_fn_type { + SCALE_DEFAULT = 0, + SCALE_THERM_100K_PULLUP, + SCALE_PMIC_THERM, + SCALE_XOTHERM, + SCALE_PMI_CHG_TEMP, +}; + +int qcom_vadc_scale(enum vadc_scale_fn_type scaletype, + const struct vadc_linear_graph *calib_graph, + const struct vadc_prescale_ratio *prescale, + bool absolute, + u16 adc_code, int *result_mdec); + +int qcom_vadc_decimation_from_dt(u32 value); + +#endif /* QCOM_VADC_COMMON_H */