> On Motorola phones like droid 4 there is a custom CPCAP PMIC. This PMIC
> has ADCs that are used for battery charging and USB PHY VBUS and ID pin
> detection.
>
> Unfortunately the only documentation for this ADC seems to be the
> Motorola mapphone Linux kernel tree. I have tested that reading raw and
> scaled values works, but I have not used the timed sampling that the ADC
> seems to support.
comments below
> Let's add a minimal support for it so we can eventually provide IIO
> channels for the related battery charging and USB PHY drivers.
>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: Marcel Partap <mpartap@xxxxxxx>
> Cc: Michael Scott <michael.scott@xxxxxxxxxx>
> Cc: Sebastian Reichel <sre@xxxxxxxxxx>
> Signed-off-by: Tony Lindgrne <tony@xxxxxxxxxxx>
Lindgren
> ---
> .../devicetree/bindings/iio/adc/cpcap-adc.txt | 16 +
> drivers/iio/adc/Kconfig | 11 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/cpcap-adc.c | 997 +++++++++++++++++++++
> 4 files changed, 1025 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/cpcap-adc.txt
> create mode 100644 drivers/iio/adc/cpcap-adc.c
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/cpcap-adc.txt b/Documentation/devicetree/bindings/iio/adc/cpcap-adc.txt
> new file mode 100644
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/cpcap-adc.txt
> @@ -0,0 +1,16 @@
> +Motorola CPCAP PMIC ADC binding
> +
> +Required properties:
> +- compatible: Should be "motorola,cpcap-adc" or "motorola,mapphone-cpcap-adc"
> +- interrupts: The interrupt number for the ADC device
> +- interrupt-names: Should be "adcdone"
> +- #io-channel-cells: Number of cells in an IIO specifier
> +
> +Example:
> +
> +cpcap_adc: adc {
> + compatible = "motorola,mapphone-cpcap-adc";
> + interrupts-extended = <&cpcap 8 0>;
interrupts?
> + interrupt-names = "adcdone";
> + #io-channel-cells = <1>;
> +};
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -195,6 +195,17 @@ config CC10001_ADC
> This driver can also be built as a module. If so, the module will be
> called cc10001_adc.
>
> +config CPCAP_ADC
> + tristate "Motorola CPCAP PMIC ADC driver"
> + depends on MFD_CPCAP
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + Say yes here to build support for Motorola CPCAP PMIC ADC.
> +
> + This driver can also be built as a module. If so, the module will be
> + called cpcap-adc.
> +
> config DA9150_GPADC
> tristate "Dialog DA9150 GPADC driver support"
> depends on MFD_DA9150
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_AXP288_ADC) += axp288_adc.o
> obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o
> obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o
> obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o
> +obj-$(CONFIG_CPCAP_ADC) += cpcap-adc.o
> obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
> obj-$(CONFIG_ENVELOPE_DETECTOR) += envelope-detector.o
> obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
> diff --git a/drivers/iio/adc/cpcap-adc.c b/drivers/iio/adc/cpcap-adc.c
> new file mode 100644
> --- /dev/null
> +++ b/drivers/iio/adc/cpcap-adc.c
> @@ -0,0 +1,997 @@
> +/*
> + * Copyright (C) 2017 Tony Lindgren <tony@xxxxxxxxxxx>
> + *
> + * Rewritten for Linux IIO framework with register managing functions
> + * based on earlier driver found in the Motorola Linux kernel:
> + *
> + * Copyright (C) 2009-2010 Motorola, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/driver.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/kfifo_buf.h>
> +#include <linux/mfd/motorola-cpcap.h>
> +
> +/* Register CPCAP_REG_ADCC1 bits */
> +#define CPCAP_BIT_ADEN_AUTO_CLR BIT(15) /* Currently unused */
> +#define CPCAP_BIT_CAL_MODE BIT(14) /* Set with BIT_RAND0 */
> +#define CPCAP_BIT_ADC_CLK_SEL1 BIT(13) /* Currently unused */
> +#define CPCAP_BIT_ADC_CLK_SEL0 BIT(12) /* Currently unused */
> +#define CPCAP_BIT_ATOX BIT(11) /* in/out ps factor */
wondering what a 'ps' factor is...
> +#define CPCAP_BIT_ATO3 BIT(10)
> +#define CPCAP_BIT_ATO2 BIT(9)
> +#define CPCAP_BIT_ATO1 BIT(8)
> +#define CPCAP_BIT_ATO0 BIT(7)
> +#define CPCAP_BIT_ADA2 BIT(6)
> +#define CPCAP_BIT_ADA1 BIT(5)
> +#define CPCAP_BIT_ADA0 BIT(4)
> +#define CPCAP_BIT_AD_SEL1 BIT(3) /* Set for ADC_TYPE_BANK_1 */
> +#define CPCAP_BIT_RAND1 BIT(2) /* Set for ADC_TYPE_BATT_PI */
> +#define CPCAP_BIT_RAND0 BIT(1) /* Set with CAL_MODE */
> +#define CPCAP_BIT_ADEN BIT(0) /* Currently unused */
> +
> +/* Register CPCAP_REG_ADCC2 bits */
> +#define CPCAP_BIT_CAL_FACTOR_ENABLE BIT(15) /* Currently unused */
> +#define CPCAP_BIT_BATDETB_EN BIT(14) /* Currently unused */
> +#define CPCAP_BIT_ADTRIG_ONESHOT BIT(13) /* Set for !TIMING_IMM */
> +#define CPCAP_BIT_ASC BIT(12) /* Set for TIMING_IMM */
> +#define CPCAP_BIT_ATOX_PS_FACTOR BIT(11) /* in/out ps factor */
> +#define CPCAP_BIT_ADC_PS_FACTOR1 BIT(10) /* in/out ps factor */
> +#define CPCAP_BIT_ADC_PS_FACTOR0 BIT(9) /* in/out ps factor */
> +#define CPCAP_BIT_AD4_SELECT BIT(8) /* Currently unused */
> +#define CPCAP_BIT_ADC_BUSY BIT(7) /* Currently unused */
> +#define CPCAP_BIT_THERMBIAS_EN BIT(6) /* Currently unused */
> +#define CPCAP_BIT_ADTRIG_DIS BIT(5) /* Disable interrupt */
> +#define CPCAP_BIT_LIADC BIT(4) /* Currently unused */
> +#define CPCAP_BIT_TS_REFEN BIT(3) /* Currently unused */
> +#define CPCAP_BIT_TS_M2 BIT(2) /* Currently unused */
> +#define CPCAP_BIT_TS_M1 BIT(1) /* Currently unused */
> +#define CPCAP_BIT_TS_M0 BIT(0) /* Currently unused */
> +
> +#define MAX_TEMP_LVL 27
generally, we want the CPAP_ prefix
> +#define FOUR_POINT_TWO_ADC 801
> +#define ST_ADC_CAL_CHRGI_UPPER_THRESHOLD 530
> +#define ST_ADC_CAL_CHRGI_LOWER_THRESHOLD 494
> +#define ST_ADC_CAL_BATTI_UPPER_THRESHOLD 530
> +#define ST_ADC_CAL_BATTI_LOWER_THRESHOLD 494
> +#define ST_ADC_CALIBRATE_DIFF_THRESHOLD 3
> +
> +/**
> + * struct cpcap_adc_ato - timing settings for cpcap adc
> + *
> + * Unfortunately no cpcap documentation available, please document when
> + * using these.
> + */
> +struct cpcap_adc_ato {
> + unsigned short ato_in;
> + unsigned short atox_in;
> + unsigned short adc_ps_factor_in;
> + unsigned short atox_ps_factor_in;
> + unsigned short ato_out;
> + unsigned short atox_out;
> + unsigned short adc_ps_factor_out;
> + unsigned short atox_ps_factor_out;
> +};
> +
> +/**
> + * struct cpcap-adc - cpcap adc device driver data
> + * @reg: cpcap regmap
> + * @dev: struct device
> + * @vendor: cpcap vendor
> + * @irq: interrupt
> + * @lock: mutex
> + * @ato: request timings
> + * @wq_data_avail: work queue
> + * @done: work done
> + */
> +struct cpcap_adc {
> + struct regmap *reg;
> + struct device *dev;
> + u16 vendor;
> + int irq;
> + struct mutex lock; /* ADC register access lock */
> + const struct cpcap_adc_ato *ato;
> + wait_queue_head_t wq_data_avail;
> + bool done;
> +};
> +
> +/**
> + * enum cpcap_adc_bank0 - cpcap adc bank0 channels
> + */
> +enum cpcap_adc_bank0 {
> + CPCAP_ADC_AD0_BATTDETB,
> + CPCAP_ADC_BATTP,
> + CPCAP_ADC_VBUS,
> + CPCAP_ADC_AD3,
> + CPCAP_ADC_BPLUS_AD4,
> + CPCAP_ADC_CHG_ISENSE,
> + CPCAP_ADC_BATTI_ADC,
> + CPCAP_ADC_USB_ID,
> + CPCAP_ADC_BANK0_NUM,
> +};
> +
> +/**
> + * enum cpcap_adc_bank1 - cpcap adc bank1 channels
> + */
> +enum cpcap_adc_bank1 {
> + CPCAP_ADC_AD8,
> + CPCAP_ADC_AD9,
> + CPCAP_ADC_LICELL,
> + CPCAP_ADC_HV_BATTP,
> + CPCAP_ADC_TSX1_AD12,
> + CPCAP_ADC_TSX2_AD13,
> + CPCAP_ADC_TSY1_AD14,
> + CPCAP_ADC_TSY2_AD15,
> + CPCAP_ADC_BANK1_NUM,
> +};
> +
> +/**
> + * enum cpcap_adc_timing - cpcap adc timing options
> + *
> + * CPCAP_ADC_TIMING_IMM seems to be immediate with no timings.
> + * Please document when using.
> + */
> +enum cpcap_adc_timing {
> + CPCAP_ADC_TIMING_IMM,
> + CPCAP_ADC_TIMING_IN,
> + CPCAP_ADC_TIMING_OUT,
> +};
> +
> +/**
> + * enum cpcap_adc_type - cpcap adc types
> + *
> + * Two banks of channels with eight channels in each. The first two channels
> + * in bank0 can be muxed for other functionality with CPCAP_ADC_TYPE_BATT_PI.
> + */
> +enum cpcap_adc_type {
> + CPCAP_ADC_TYPE_BANK_0,
> + CPCAP_ADC_TYPE_BANK_1,
> + CPCAP_ADC_TYPE_BATT_PI,
> +};
> +
> +/**
> + * struct cpcap_adc_request - cpcap adc request
> + * @timing: timing settings
> + * @type: bank type, bank0, 1 or remuxed bank0
> + * @result: result array
> + */
> +struct cpcap_adc_request {
> + enum cpcap_adc_timing timing;
> + enum cpcap_adc_type type;
> + int result[CPCAP_ADC_BANK0_NUM];
> +};
> +
> +/**
> + * struct cpcap_adc_phasing_tbl - cpcap phasing table
> + * @offset: offset in the phasing table
> + * @multiplier: multiplier in the phasing table
> + * @divider: divider in the phasing table
> + * @min: minimum value
> + * @max: maximum value
> + */
> +struct cpcap_adc_phasing_tbl {
> + short offset;
> + unsigned short multiplier;
> + unsigned short divider;
> + short min;
> + short max;
> +};
> +
> +/**
> + * enum cpcap_adc_conv_type - cpcap conversion types
> + */
> +enum cpcap_adc_conv_type {
> + CONV_TYPE_NONE,
> + CONV_TYPE_DIRECT,
> + CONV_TYPE_MAPPING,
> +};
> +
> +/**
> + * struct cpcap_adc_conversion_tbl - cpcap conversion table
> + * @conv_type: conversion type
> + * @align_offset: align offset
> + * @conv_offset: conversion offset
> + * @cal_offset: calibration offset
> + * @multiplier: conversion multiplier
> + * @divider: conversion divider
> + */
> +struct cpcap_adc_conversion_tbl {
> + enum cpcap_adc_conv_type conv_type;
> + int align_offset;
> + int conv_offset;
> + int cal_offset;
> + int multiplier;
> + int divider;
> +};
> +
> +/* Phasing table for bank0 */
> +static struct cpcap_adc_phasing_tbl bank0_phasing[CPCAP_ADC_BANK0_NUM] = {
const
> + [CPCAP_ADC_AD0_BATTDETB] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_BATTP] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_VBUS] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_AD3] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_BPLUS_AD4] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_CHG_ISENSE] = {0, 0x80, 0x80, -512, 511},
> + [CPCAP_ADC_BATTI_ADC] = {0, 0x80, 0x80, -512, 511},
> + [CPCAP_ADC_USB_ID] = {0, 0x80, 0x80, 0, 1023},
> +};
> +
> +/* Phasing table for bank1 */
> +static struct cpcap_adc_phasing_tbl bank1_phasing[CPCAP_ADC_BANK1_NUM] = {
const
> + [CPCAP_ADC_AD8] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_AD9] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_LICELL] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_HV_BATTP] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_TSX1_AD12] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_TSX2_AD13] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_TSY1_AD14] = {0, 0x80, 0x80, 0, 1023},
> + [CPCAP_ADC_TSY2_AD15] = {0, 0x80, 0x80, 0, 1023},
> +};
> +
> +/* Conversion table for bank0 */
> +static struct cpcap_adc_conversion_tbl bank0_conversion[CPCAP_ADC_BANK0_NUM] = {
const
> + [CPCAP_ADC_AD0_BATTDETB] = {
> + CONV_TYPE_MAPPING, 0, 0, 0, 1, 1,
> + },
> + [CPCAP_ADC_BATTP] = {
> + CONV_TYPE_DIRECT, 0, 2400, 0, 2300, 1023,
> + },
> + [CPCAP_ADC_VBUS] = {
> + CONV_TYPE_DIRECT, 0, 0, 0, 10000, 1023,
> + },
> + [CPCAP_ADC_AD3] = {
> + CONV_TYPE_MAPPING, 0, 0, 0, 1, 1,
> + },
> + [CPCAP_ADC_BPLUS_AD4] = {
> + CONV_TYPE_DIRECT, 0, 2400, 0, 2300, 1023,
> + },
> + [CPCAP_ADC_CHG_ISENSE] = {
> + CONV_TYPE_DIRECT, -512, 2, 0, 5000, 1023,
> + },
> + [CPCAP_ADC_BATTI_ADC] = {
> + CONV_TYPE_DIRECT, -512, 2, 0, 5000, 1023,
> + },
> + [CPCAP_ADC_USB_ID] = {
> + CONV_TYPE_NONE, 0, 0, 0, 1, 1,
> + },
> +};
> +
> +/* Conversion table for bank1 */
> +static struct cpcap_adc_conversion_tbl bank1_conversion[CPCAP_ADC_BANK1_NUM] = {
const
> + [CPCAP_ADC_AD8] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_AD9] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_LICELL] = {CONV_TYPE_DIRECT, 0, 0, 0, 3400, 1023},
> + [CPCAP_ADC_HV_BATTP] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_TSX1_AD12] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_TSX2_AD13] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_TSY1_AD14] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> + [CPCAP_ADC_TSY2_AD15] = {CONV_TYPE_NONE, 0, 0, 0, 1, 1},
> +};
> +
> +/*
> + * Temperature lookup table of register values to milliCelcius.
> + * REVISIT: Check the duplicate 0x3ff entry in a freezer
> + */
> +static const int temp_map[MAX_TEMP_LVL][2] = {
> + { 0x03ff, -40000 },
> + { 0x03ff, -35000 },
> + { 0x03ef, -30000 },
> + { 0x03b2, -25000 },
> + { 0x036c, -20000 },
> + { 0x0320, -15000 },
> + { 0x02d0, -10000 },
> + { 0x027f, -5000 },
> + { 0x022f, 0 },
> + { 0x01e4, 5000 },
> + { 0x019f, 10000 },
> + { 0x0161, 15000 },
> + { 0x012b, 20000 },
> + { 0x00fc, 25000 },
> + { 0x00d4, 30000 },
> + { 0x00b2, 35000 },
> + { 0x0095, 40000 },
> + { 0x007d, 45000 },
> + { 0x0069, 50000 },
> + { 0x0059, 55000 },
> + { 0x004b, 60000 },
> + { 0x003f, 65000 },
> + { 0x0036, 70000 },
> + { 0x002e, 75000 },
> + { 0x0027, 80000 },
> + { 0x0022, 85000 },
> + { 0x001d, 90000 },
> +};
> +
> +static irqreturn_t cpcap_adc_irq_thread(int irq, void *data)
> +{
> + struct iio_dev *indio_dev = data;
> + struct cpcap_adc *ddata = iio_priv(indio_dev);
> + int error;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_DIS,
> + CPCAP_BIT_ADTRIG_DIS);
> + if (error)
> + return IRQ_NONE;
> +
> + ddata->done = true;
> + wake_up_interruptible(&ddata->wq_data_avail);
> +
> + return IRQ_HANDLED;
> +}
> +
> +#define CPCAP_CHAN(_type, _index, _address, _datasheet_name) { \
> + .type = (_type), \
> + .address = (_address), \
> + .indexed = 1, \
> + .channel = (_index), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE), \
> + .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
I don't see SAMP_FREQ and _OVERSAMPLING handled?
> + .scan_index = (_index), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = 10, \
> + .storagebits = 16, \
> + .endianness = IIO_CPU, \
> + }, \
> + .datasheet_name = (_datasheet_name), \
> +}
> +
> +/*
> + * The datasheet names are from Motorola mapphone Linux kernel except
> + * for the last two which might be uncalibrated charge voltage and
> + * current.
> + */
> +static const struct iio_chan_spec cpcap_adc_channels[] = {
> + CPCAP_CHAN(IIO_TEMP, 0, CPCAP_REG_ADCD0, "battdetb"),
> + CPCAP_CHAN(IIO_VOLTAGE, 1, CPCAP_REG_ADCD1, "battp"),
> + CPCAP_CHAN(IIO_VOLTAGE, 2, CPCAP_REG_ADCD2, "vbus"),
> + CPCAP_CHAN(IIO_TEMP, 3, CPCAP_REG_ADCD3, "ad3"),
> + CPCAP_CHAN(IIO_VOLTAGE, 4, CPCAP_REG_ADCD4, "ad4"),
> + CPCAP_CHAN(IIO_CURRENT, 5, CPCAP_REG_ADCD5, "chg_isense"),
> + CPCAP_CHAN(IIO_CURRENT, 6, CPCAP_REG_ADCD6, "batti"),
> + CPCAP_CHAN(IIO_VOLTAGE, 7, CPCAP_REG_ADCD7, "usb_id"),
> +
> + CPCAP_CHAN(IIO_CURRENT, 8, CPCAP_REG_ADCD0, "ad8"),
> + CPCAP_CHAN(IIO_VOLTAGE, 9, CPCAP_REG_ADCD1, "ad9"),
> + CPCAP_CHAN(IIO_VOLTAGE, 10, CPCAP_REG_ADCD2, "licell"),
> + CPCAP_CHAN(IIO_VOLTAGE, 11, CPCAP_REG_ADCD3, "hv_battp"),
> + CPCAP_CHAN(IIO_VOLTAGE, 12, CPCAP_REG_ADCD4, "tsx1_ad12"),
> + CPCAP_CHAN(IIO_VOLTAGE, 13, CPCAP_REG_ADCD5, "tsx2_ad13"),
> + CPCAP_CHAN(IIO_VOLTAGE, 14, CPCAP_REG_ADCD6, "tsy1_ad14"),
> + CPCAP_CHAN(IIO_VOLTAGE, 15, CPCAP_REG_ADCD7, "tsy2_ad15"),
> +
> + /* There are two registers with multiplexed functionality */
> + CPCAP_CHAN(IIO_VOLTAGE, 16, CPCAP_REG_ADCD0, "chg_vsense"),
> + CPCAP_CHAN(IIO_CURRENT, 17, CPCAP_REG_ADCD1, "batti2"),
> +};
> +
> +/* ADC calibration functions */
> +
drop newline
> +static void cpcap_adc_setup_calibrate(struct cpcap_adc *ddata,
> + enum cpcap_adc_bank0 chan)
> +{
> + unsigned int value = 0;
> + unsigned long timeout = jiffies + msecs_to_jiffies(3000);
> + int error;
> +
> + if ((chan != CPCAP_ADC_CHG_ISENSE) &&
> + (chan != CPCAP_ADC_BATTI_ADC))
> + return;
> +
> + value |= CPCAP_BIT_CAL_MODE | CPCAP_BIT_RAND0;
> + value |= ((chan << 4) &
> + (CPCAP_BIT_ADA2 | CPCAP_BIT_ADA1 | CPCAP_BIT_ADA0));
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC1,
> + CPCAP_BIT_CAL_MODE | CPCAP_BIT_ATOX |
> + CPCAP_BIT_ATO3 | CPCAP_BIT_ATO2 |
> + CPCAP_BIT_ATO1 | CPCAP_BIT_ATO0 |
> + CPCAP_BIT_ADA2 | CPCAP_BIT_ADA1 |
> + CPCAP_BIT_ADA0 | CPCAP_BIT_AD_SEL1 |
> + CPCAP_BIT_RAND1 | CPCAP_BIT_RAND0,
> + value);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ATOX_PS_FACTOR |
> + CPCAP_BIT_ADC_PS_FACTOR1 |
> + CPCAP_BIT_ADC_PS_FACTOR0,
> + 0);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_DIS,
> + CPCAP_BIT_ADTRIG_DIS);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ASC,
> + CPCAP_BIT_ASC);
> + if (error)
> + return;
> +
> + do {
> + schedule_timeout_uninterruptible(1);
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCC2, &value);
> + if (error)
> + return;
> + } while ((value & CPCAP_BIT_ASC) && time_before(jiffies, timeout));
> +
> + if (value & CPCAP_BIT_ASC)
> + dev_err(ddata->dev,
> + "Timeout waiting for calibration to complete\n");
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC1,
> + CPCAP_BIT_CAL_MODE, 0);
> + if (error)
> + return;
> +}
> +
> +static int cpcap_adc_calibrate(struct cpcap_adc *ddata)
> +{
> + unsigned int cal_data[2];
> + unsigned short cal_data_diff;
> + int i, error;
> +
> + i = 0;
> + do {
> + cal_data[0] = 0;
> + cal_data[1] = 0;
> + cal_data_diff = 0;
> + cpcap_adc_setup_calibrate(ddata, CPCAP_ADC_CHG_ISENSE);
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL1, &cal_data[0]);
> + if (error)
> + return error;
> + cpcap_adc_setup_calibrate(ddata, CPCAP_ADC_CHG_ISENSE);
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL1, &cal_data[1]);
> + if (error)
> + return error;
> +
> + if (cal_data[0] > cal_data[1])
> + cal_data_diff = cal_data[0] - cal_data[1];
> + else
> + cal_data_diff = cal_data[1] - cal_data[0];
> +
> + if (((cal_data[1] >= ST_ADC_CAL_CHRGI_LOWER_THRESHOLD) &&
> + (cal_data[1] <= ST_ADC_CAL_CHRGI_UPPER_THRESHOLD) &&
> + (cal_data_diff <= ST_ADC_CALIBRATE_DIFF_THRESHOLD)) ||
> + (ddata->vendor == CPCAP_VENDOR_TI)) {
> + bank0_conversion[CPCAP_ADC_CHG_ISENSE].cal_offset =
> + ((short)cal_data[1] * -1) + 512;
> + dev_info(ddata->dev,
> + "cpcap_adc_probe: CHRGI Cal complete!\n");
maybe calibration instead of Cal
> + break;
> + }
> +
> + msleep(5);
I guess this will trigger a checkpatch warning
> + i++;
> + } while (i > 5);
should be < 5????
why not just use a for look?
> +
> + i = 0;
> + do {
can't this code duplication be avoided?
> + cal_data[0] = 0;
> + cal_data[1] = 0;
> + cal_data_diff = 0;
> + cpcap_adc_setup_calibrate(ddata, CPCAP_ADC_BATTI_ADC);
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL2, &cal_data[0]);
> + if (error)
> + return error;
> + cpcap_adc_setup_calibrate(ddata, CPCAP_ADC_BATTI_ADC);
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL2, &cal_data[1]);
> + if (error)
> + return error;
> +
> + if (cal_data[0] > cal_data[1])
> + cal_data_diff = cal_data[0] - cal_data[1];
> + else
> + cal_data_diff = cal_data[1] - cal_data[0];
> +
> + if (((cal_data[1] >= ST_ADC_CAL_BATTI_LOWER_THRESHOLD) &&
> + (cal_data[1] <= ST_ADC_CAL_BATTI_UPPER_THRESHOLD) &&
> + (cal_data_diff <= ST_ADC_CALIBRATE_DIFF_THRESHOLD)) ||
> + (ddata->vendor == CPCAP_VENDOR_TI)) {
> + bank0_conversion[CPCAP_ADC_BATTI_ADC].cal_offset =
> + ((short)cal_data[1] * -1) + 512;
> + dev_info(ddata->dev,
> + "cpcap_adc_probe: BATTI Cal complete!\n");
> + break;
> + }
> +
> + msleep(5);
I guess this will trigger a checkpatch warning
> + i++;
> + } while (i > 5);
should be < 5????
> +
> + return 0;
> +}
> +
> +/* ADC setup, read and scale functions */
drop newline
> +
> +static void cpcap_adc_setup_bank(struct cpcap_adc *ddata,
> + enum cpcap_adc_type type,
> + enum cpcap_adc_timing timing)
> +{
> + const struct cpcap_adc_ato *ato = ddata->ato;
> + unsigned short value1 = 0;
> + unsigned short value2 = 0;
> + int error;
> +
> + if (!ato)
> + return;
> +
> + if (type == CPCAP_ADC_TYPE_BANK_1)
> + value1 |= CPCAP_BIT_AD_SEL1;
> + else if (type == CPCAP_ADC_TYPE_BATT_PI)
> + value1 |= CPCAP_BIT_RAND1;
> +
> + switch (timing) {
> + case CPCAP_ADC_TIMING_IN:
> + value1 |= ato->ato_in;
> + value1 |= ato->atox_in;
> + value2 |= ato->adc_ps_factor_in;
> + value2 |= ato->atox_ps_factor_in;
> + break;
> +
> + case CPCAP_ADC_TIMING_OUT:
> + value1 |= ato->ato_out;
> + value1 |= ato->atox_out;
> + value2 |= ato->adc_ps_factor_out;
> + value2 |= ato->atox_ps_factor_out;
> + break;
> +
> + case CPCAP_ADC_TIMING_IMM:
> + default:
> + break;
> + }
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC1,
> + CPCAP_BIT_CAL_MODE | CPCAP_BIT_ATOX |
> + CPCAP_BIT_ATO3 | CPCAP_BIT_ATO2 |
> + CPCAP_BIT_ATO1 | CPCAP_BIT_ATO0 |
> + CPCAP_BIT_ADA2 | CPCAP_BIT_ADA1 |
> + CPCAP_BIT_ADA0 | CPCAP_BIT_AD_SEL1 |
> + CPCAP_BIT_RAND1 | CPCAP_BIT_RAND0,
> + value1);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ATOX_PS_FACTOR |
> + CPCAP_BIT_ADC_PS_FACTOR1 |
> + CPCAP_BIT_ADC_PS_FACTOR0,
> + value2);
> + if (error)
> + return;
> +
> + if (timing == CPCAP_ADC_TIMING_IMM) {
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_DIS,
> + CPCAP_BIT_ADTRIG_DIS);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ASC,
> + CPCAP_BIT_ASC);
> + if (error)
> + return;
> + } else {
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_ONESHOT,
> + CPCAP_BIT_ADTRIG_ONESHOT);
> + if (error)
> + return;
> +
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_DIS, 0);
> + if (error)
> + return;
> + }
> +}
> +
> +/*
> + * Occasionally the ADC does not seem to start and there will be no
> + * interrupt. Let's re-init interrupt to prevent the ADC from hanging
> + * for the next request. It is unclear why this happens, but the next
> + * request will usually work after doing this.
> + */
> +static void cpcap_adc_quirk_reset_lost_irq(struct cpcap_adc *ddata)
> +{
> + int error;
> +
> + dev_info(ddata->dev, "lost ADC irq, attempting to reinit\n");
> + disable_irq(ddata->irq);
> + error = regmap_update_bits(ddata->reg, CPCAP_REG_ADCC2,
> + CPCAP_BIT_ADTRIG_DIS,
> + CPCAP_BIT_ADTRIG_DIS);
> + if (error)
> + dev_warn(ddata->dev, "%s reset failed: %i\n",
> + __func__, error);
> + enable_irq(ddata->irq);
> +}
> +
> +static int cpcap_adc_start_bank(struct cpcap_adc *ddata,
> + struct cpcap_adc_request *req)
> +{
> + int i, error;
> +
> + req->timing = CPCAP_ADC_TIMING_IMM;
> + ddata->done = false;
> +
> + for (i = 0; i < 5; i++) {
> + cpcap_adc_setup_bank(ddata, req->type, req->timing);
> + error = wait_event_interruptible_timeout(ddata->wq_data_avail,
> + ddata->done,
> + msecs_to_jiffies(50));
> + if (error >= 0)
> + return 0;
> +
> + if (error == 0) {
error has been checked >= 0 above already?!
> + cpcap_adc_quirk_reset_lost_irq(ddata);
> + error = -ETIMEDOUT;
> + continue;
> + }
> +
> + if (error < 0)
> + return error;
> + }
> +
> + return error;
> +}
> +
> +static void cpcap_adc_phase(struct cpcap_adc_request *req, int index)
> +{
> + struct cpcap_adc_conversion_tbl *conv_tbl = bank0_conversion;
> + struct cpcap_adc_phasing_tbl *phase_tbl = bank0_phasing;
> + int tbl_index = index;
> +
> + if (req->type == CPCAP_ADC_TYPE_BANK_1) {
> + conv_tbl = bank1_conversion;
> + phase_tbl = bank1_phasing;
> + }
> +
> + if (req->type == CPCAP_ADC_TYPE_BATT_PI)
> + tbl_index = (tbl_index % 2) ? CPCAP_ADC_BATTI_ADC :
> + CPCAP_ADC_BATTP;
> +
> + if (((req->type == CPCAP_ADC_TYPE_BANK_0) ||
> + (req->type == CPCAP_ADC_TYPE_BATT_PI)) &&
> + (tbl_index == CPCAP_ADC_BATTP)) {
> + req->result[index] -= phase_tbl[tbl_index].offset;
> + req->result[index] -= FOUR_POINT_TWO_ADC;
> + req->result[index] *= phase_tbl[tbl_index].multiplier;
> + if (phase_tbl[tbl_index].divider == 0)
> + return;
> + req->result[index] /= phase_tbl[tbl_index].divider;
> + req->result[index] += FOUR_POINT_TWO_ADC;
> + } else {
> + req->result[index] += conv_tbl[tbl_index].cal_offset;
> + req->result[index] += conv_tbl[tbl_index].align_offset;
> + req->result[index] *= phase_tbl[tbl_index].multiplier;
> + if (phase_tbl[tbl_index].divider == 0)
> + return;
> + req->result[index] /= phase_tbl[tbl_index].divider;
> + req->result[index] += phase_tbl[tbl_index].offset;
> + }
> +
> + if (req->result[index] < phase_tbl[tbl_index].min)
> + req->result[index] = phase_tbl[tbl_index].min;
> + else if (req->result[index] > phase_tbl[tbl_index].max)
> + req->result[index] = phase_tbl[tbl_index].max;
> +}
> +
> +/* Looks up temperatures in a table and calculates averages if needed */
> +static unsigned short cpcap_adc_table_to_millicelcius(unsigned short value)
why unsigned if it returns millicelcius, shouldn't this be int to cover
the temperature rate?
> +{
> + int i;
> + int result = 0, alpha = 0;
initialization not needed
> +
> + if (value <= temp_map[MAX_TEMP_LVL - 1][0])
> + return temp_map[MAX_TEMP_LVL - 1][1];
> +
> + if (value >= temp_map[0][0])
> + return temp_map[0][1];
> +
> + for (i = 0; i < MAX_TEMP_LVL - 1; i++) {
> + if ((value <= temp_map[i][0]) &&
> + (value >= temp_map[i + 1][0])) {
> + if (value == temp_map[i][0]) {
> + result = temp_map[i][1];
> + } else if (value == temp_map[i + 1][0]) {
> + result = temp_map[i + 1][1];
> + } else {
> + alpha = ((value - temp_map[i][0]) * 1000) /
> + (temp_map[i + 1][0] - temp_map[i][0]);
> +
> + result = temp_map[i][1] +
> + ((alpha * (temp_map[i + 1][1] -
> + temp_map[i][1])) / 1000);
> + }
> + break;
> + }
> + }
> +
> + return result;
> +}
> +
> +static void cpcap_adc_convert(struct cpcap_adc_request *req, int index)
> +{
> + struct cpcap_adc_conversion_tbl *conv_tbl = bank0_conversion;
> + int tbl_index = index;
> +
> + if (req->type == CPCAP_ADC_TYPE_BANK_1)
> + conv_tbl = bank1_conversion;
> +
> + if (req->type == CPCAP_ADC_TYPE_BATT_PI)
> + tbl_index = (tbl_index % 2) ? CPCAP_ADC_BATTI_ADC :
> + CPCAP_ADC_BATTP;
> +
> + if (conv_tbl[tbl_index].conv_type == CONV_TYPE_DIRECT) {
> + req->result[index] *= conv_tbl[tbl_index].multiplier;
> + if (conv_tbl[tbl_index].divider == 0)
> + return;
> + req->result[index] /= conv_tbl[tbl_index].divider;
> + req->result[index] += conv_tbl[tbl_index].conv_offset;
> + } else if (conv_tbl[tbl_index].conv_type == CONV_TYPE_MAPPING)
> + req->result[index] =
> + cpcap_adc_table_to_millicelcius(req->result[tbl_index]);
> +}
> +
> +static int cpcap_adc_read_bank_scaled(struct cpcap_adc *ddata,
> + struct cpcap_adc_request *req,
> + const unsigned long channel_mask)
> +{
> + unsigned int i;
> + int cal_data, error;
> +
> + if (ddata->vendor == CPCAP_VENDOR_TI) {
> + cal_data = 0;
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL1, &cal_data);
> + if (error)
> + return error;
> + bank0_conversion[CPCAP_ADC_CHG_ISENSE].cal_offset =
> + ((short)cal_data * -1) + 512;
> + }
> +
> + if (ddata->vendor == CPCAP_VENDOR_TI) {
> + cal_data = 0;
> + error = regmap_read(ddata->reg, CPCAP_REG_ADCAL2, &cal_data);
> + if (error)
> + return error;
> + bank0_conversion[CPCAP_ADC_BATTI_ADC].cal_offset =
> + ((short)cal_data * -1) + 512;
> + }
> +
> + for_each_set_bit(i, &channel_mask, 8) {
> + int addr = CPCAP_REG_ADCD0 + i * 4;
> +
> + error = regmap_read(ddata->reg, addr, &req->result[i]);
> + if (error)
> + return error;
> +
> + req->result[i] &= 0x3ff;
> + cpcap_adc_phase(req, i);
> + cpcap_adc_convert(req, i);
> + }
> +
> + return 0;
> +}
> +
> +static int cpcap_adc_read(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct cpcap_adc *ddata = iio_priv(indio_dev);
> + struct cpcap_adc_request req;
> + int index, error;
> +
> + if (chan->channel < 8) {
> + index = chan->channel;
> + req.type = CPCAP_ADC_TYPE_BANK_0;
> + } else if (chan->channel < 16) {
> + index = chan->channel - 8;
> + req.type = CPCAP_ADC_TYPE_BANK_1;
> + } else if (chan->channel < 18) {
> + index = chan->channel - 16;
> + req.type = CPCAP_ADC_TYPE_BATT_PI;
> + } else {
> + return -EINVAL;
> + }
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + mutex_lock(&ddata->lock);
> + error = cpcap_adc_start_bank(ddata, &req);
> + if (error)
> + goto err_unlock;
> + error = regmap_read(ddata->reg, chan->address, val);
> + if (error)
> + goto err_unlock;
> + mutex_unlock(&ddata->lock);
> + break;
> + case IIO_CHAN_INFO_SCALE:
> + mutex_lock(&ddata->lock);
> + error = cpcap_adc_start_bank(ddata, &req);
> + if (error)
> + goto err_unlock;
> + error = cpcap_adc_read_bank_scaled(ddata, &req, BIT(index));
> + if (error)
> + goto err_unlock;
> + mutex_unlock(&ddata->lock);
> + *val = req.result[index];
> + break;
> + default:
-EINVAL here?
> + break;
> + }
> +
> + return IIO_VAL_INT;
> +
> +err_unlock:
> + mutex_unlock(&ddata->lock);
> + dev_err(ddata->dev, "error reading ADC: %i\n", error);
> +
> + return error;
> +}
> +
> +static const struct iio_info cpcap_adc_info = {
> + .read_raw = &cpcap_adc_read,
> + .driver_module = THIS_MODULE,
> +};
> +
> +/*
> + * Configuration for Motorola mapphone series such as droid 4.
> + * Copied from the Motorola mapphone kernel tree.
> + */
> +static const struct cpcap_adc_ato mapphone_adc = {
> + .ato_in = 0x0480,
> + .atox_in = 0,
> + .adc_ps_factor_in = 0x0200,
> + .atox_ps_factor_in = 0,
> + .ato_out = 0,
> + .atox_out = 0,
> + .adc_ps_factor_out = 0,
> + .atox_ps_factor_out = 0,
> +};
> +
> +static const struct of_device_id cpcap_adc_id_table[] = {
> + {
> + .compatible = "motorola,cpcap-adc",
> + },
> + {
> + .compatible = "motorola,mapphone-cpcap-adc",
> + .data = &mapphone_adc,
> + },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, cpcap_adc_id_table);
> +
> +static int cpcap_adc_probe(struct platform_device *pdev)
> +{
> + const struct of_device_id *match;
> + struct cpcap_adc *ddata;
> + struct iio_dev *indio_dev;
> + struct iio_buffer *buf;
> + int error;
> +
> + match = of_match_device(of_match_ptr(cpcap_adc_id_table),
> + &pdev->dev);
> + if (!match)
> + return -EINVAL;
> +
> + if (!match->data) {
> + dev_err(&pdev->dev, "no configuration data found\n");
> +
> + return -ENODEV;
> + }
> +
> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*ddata));
> + if (!indio_dev) {
> + dev_err(&pdev->dev, "failed to allocate iio device\n");
> +
> + return -ENOMEM;
> + }
> + ddata = iio_priv(indio_dev);
> + ddata->ato = match->data;
> + ddata->dev = &pdev->dev;
> +
> + mutex_init(&ddata->lock);
> + init_waitqueue_head(&ddata->wq_data_avail);
> +
> + indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->dev.of_node = pdev->dev.of_node;
> + indio_dev->channels = cpcap_adc_channels;
> + indio_dev->num_channels = ARRAY_SIZE(cpcap_adc_channels);
> + indio_dev->name = dev_name(&pdev->dev);
> + indio_dev->info = &cpcap_adc_info;
> +
> + ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!ddata->reg)
> + return -ENODEV;
> +
> + error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor);
> + if (error)
> + return error;
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + ddata->irq = platform_get_irq_byname(pdev, "adcdone");
> + if (!ddata->irq)
> + return -ENODEV;
> +
> + error = devm_request_threaded_irq(&pdev->dev, ddata->irq, NULL,
> + cpcap_adc_irq_thread, IRQ_NONE,
> + "cpcap-adc", indio_dev);
> + if (error) {
> + dev_err(&pdev->dev, "could not get irq: %i\n",
> + error);
> +
> + return error;
> + }
> +
> + error = cpcap_adc_calibrate(ddata);
> + if (error)
> + return error;
> +
> + buf = devm_iio_kfifo_allocate(&indio_dev->dev);
> + if (!buf)
> + return -ENOMEM;
> +
> + iio_device_attach_buffer(indio_dev, buf);
> +
> + dev_info(&pdev->dev, "CPCAP ADC device probed\n");
> +
> + return iio_device_register(indio_dev);
> +}
> +
> +static int cpcap_adc_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> +
> + iio_device_unregister(indio_dev);
> +
> + return 0;
> +}
> +
> +static struct platform_driver cpcap_adc_driver = {
> + .driver = {
> + .name = "cpcap_adc",
> + .of_match_table = of_match_ptr(cpcap_adc_id_table),
> + },
> + .probe = cpcap_adc_probe,
> + .remove = cpcap_adc_remove,
> +};
> +
> +module_platform_driver(cpcap_adc_driver);
> +
> +MODULE_ALIAS("platform:cpcap_adc");
> +MODULE_DESCRIPTION("CPCAP ADC driver");
> +MODULE_AUTHOR("Motorola and Tony Lindgren <tony@xxxxxxxxxxx");
> +MODULE_LICENSE("GPL v2");
>
--
Peter Meerwald-Stadler
Mobile: +43 664 24 44 418
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