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linux/drivers/iio/adc/qcom-pm8xxx-xoadc.c
Linus Walleij 63c3ecd946 iio: adc: add a driver for Qualcomm PM8xxx HK/XOADC 
The Qualcomm PM8xxx PMICs contain a simpler ADC than its
successors (already in the kernel as qcom-spmi-vadc.c):
the HK/XO ADC (Housekeeping/Chrystal oscillator ADC).

As far as I can understand this is equal to the PMICs
using SSBI transport and encompass PM8018, PM8038,
PM8058, and PM8921, so this is shortly named PM8xxx.

This ADC monitors a bunch of on-board voltages and the die
temperature of the PMIC itself, but it can also be routed
to convert a few external MPPs (multi-purpose pins). On
the APQ8060 DragonBoard this feature is used to let this
ADC convert an analog ALS (Ambient Light Sensor) voltage
signal from a Capella CM3605 ALS into a LUX value.

Developed and tested with APQ8060 DragonBoard based on
Ivan's driver and Rama Krishna's patches. The SPMI VADC
driver is quite different, but share enough minor
functionality that I have split out to the common file
in a previous patch.

Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: Ivan T. Ivanov <iivanov.xz@gmail.com>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2017-04-08 17:42:26 +01:00

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/*
* Qualcomm PM8xxx PMIC XOADC driver
*
* These ADCs are known as HK/XO (house keeping / chrystal oscillator)
* "XO" in "XOADC" means Chrystal Oscillator. It's a bunch of
* specific-purpose and general purpose ADC converters and channels.
*
* Copyright (C) 2017 Linaro Ltd.
* Author: Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include "qcom-vadc-common.h"
/*
* Definitions for the "user processor" registers lifted from the v3.4
* Qualcomm tree. Their kernel has two out-of-tree drivers for the ADC:
* drivers/misc/pmic8058-xoadc.c
* drivers/hwmon/pm8xxx-adc.c
* None of them contain any complete register specification, so this is
* a best effort of combining the information.
*/
/* These appear to be "battery monitor" registers */
#define ADC_ARB_BTM_CNTRL1 0x17e
#define ADC_ARB_BTM_CNTRL1_EN_BTM BIT(0)
#define ADC_ARB_BTM_CNTRL1_SEL_OP_MODE BIT(1)
#define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL1 BIT(2)
#define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL2 BIT(3)
#define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL3 BIT(4)
#define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL4 BIT(5)
#define ADC_ARB_BTM_CNTRL1_EOC BIT(6)
#define ADC_ARB_BTM_CNTRL1_REQ BIT(7)
#define ADC_ARB_BTM_AMUX_CNTRL 0x17f
#define ADC_ARB_BTM_ANA_PARAM 0x180
#define ADC_ARB_BTM_DIG_PARAM 0x181
#define ADC_ARB_BTM_RSV 0x182
#define ADC_ARB_BTM_DATA1 0x183
#define ADC_ARB_BTM_DATA0 0x184
#define ADC_ARB_BTM_BAT_COOL_THR1 0x185
#define ADC_ARB_BTM_BAT_COOL_THR0 0x186
#define ADC_ARB_BTM_BAT_WARM_THR1 0x187
#define ADC_ARB_BTM_BAT_WARM_THR0 0x188
#define ADC_ARB_BTM_CNTRL2 0x18c
/* Proper ADC registers */
#define ADC_ARB_USRP_CNTRL 0x197
#define ADC_ARB_USRP_CNTRL_EN_ARB BIT(0)
#define ADC_ARB_USRP_CNTRL_RSV1 BIT(1)
#define ADC_ARB_USRP_CNTRL_RSV2 BIT(2)
#define ADC_ARB_USRP_CNTRL_RSV3 BIT(3)
#define ADC_ARB_USRP_CNTRL_RSV4 BIT(4)
#define ADC_ARB_USRP_CNTRL_RSV5 BIT(5)
#define ADC_ARB_USRP_CNTRL_EOC BIT(6)
#define ADC_ARB_USRP_CNTRL_REQ BIT(7)
#define ADC_ARB_USRP_AMUX_CNTRL 0x198
/*
* The channel mask includes the bits selecting channel mux and prescaler
* on PM8058, or channel mux and premux on PM8921.
*/
#define ADC_ARB_USRP_AMUX_CNTRL_CHAN_MASK 0xfc
#define ADC_ARB_USRP_AMUX_CNTRL_RSV0 BIT(0)
#define ADC_ARB_USRP_AMUX_CNTRL_RSV1 BIT(1)
/* On PM8058 this is prescaling, on PM8921 this is premux */
#define ADC_ARB_USRP_AMUX_CNTRL_PRESCALEMUX0 BIT(2)
#define ADC_ARB_USRP_AMUX_CNTRL_PRESCALEMUX1 BIT(3)
#define ADC_ARB_USRP_AMUX_CNTRL_SEL0 BIT(4)
#define ADC_ARB_USRP_AMUX_CNTRL_SEL1 BIT(5)
#define ADC_ARB_USRP_AMUX_CNTRL_SEL2 BIT(6)
#define ADC_ARB_USRP_AMUX_CNTRL_SEL3 BIT(7)
#define ADC_AMUX_PREMUX_SHIFT 2
#define ADC_AMUX_SEL_SHIFT 4
/* We know very little about the bits in this register */
#define ADC_ARB_USRP_ANA_PARAM 0x199
#define ADC_ARB_USRP_ANA_PARAM_DIS 0xFE
#define ADC_ARB_USRP_ANA_PARAM_EN 0xFF
#define ADC_ARB_USRP_DIG_PARAM 0x19A
#define ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT0 BIT(0)
#define ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT1 BIT(1)
#define ADC_ARB_USRP_DIG_PARAM_CLK_RATE0 BIT(2)
#define ADC_ARB_USRP_DIG_PARAM_CLK_RATE1 BIT(3)
#define ADC_ARB_USRP_DIG_PARAM_EOC BIT(4)
/*
* On a later ADC the decimation factors are defined as
* 00 = 512, 01 = 1024, 10 = 2048, 11 = 4096 so assume this
* holds also for this older XOADC.
*/
#define ADC_ARB_USRP_DIG_PARAM_DEC_RATE0 BIT(5)
#define ADC_ARB_USRP_DIG_PARAM_DEC_RATE1 BIT(6)
#define ADC_ARB_USRP_DIG_PARAM_EN BIT(7)
#define ADC_DIG_PARAM_DEC_SHIFT 5
#define ADC_ARB_USRP_RSV 0x19B
#define ADC_ARB_USRP_RSV_RST BIT(0)
#define ADC_ARB_USRP_RSV_DTEST0 BIT(1)
#define ADC_ARB_USRP_RSV_DTEST1 BIT(2)
#define ADC_ARB_USRP_RSV_OP BIT(3)
#define ADC_ARB_USRP_RSV_IP_SEL0 BIT(4)
#define ADC_ARB_USRP_RSV_IP_SEL1 BIT(5)
#define ADC_ARB_USRP_RSV_IP_SEL2 BIT(6)
#define ADC_ARB_USRP_RSV_TRM BIT(7)
#define ADC_RSV_IP_SEL_SHIFT 4
#define ADC_ARB_USRP_DATA0 0x19D
#define ADC_ARB_USRP_DATA1 0x19C
/**
* Physical channels which MUST exist on all PM variants in order to provide
* proper reference points for calibration.
*
* @PM8XXX_CHANNEL_INTERNAL: 625mV reference channel
* @PM8XXX_CHANNEL_125V: 1250mV reference channel
* @PM8XXX_CHANNEL_INTERNAL_2: 325mV reference channel
* @PM8XXX_CHANNEL_MUXOFF: channel to reduce input load on mux, apparently also
* measures XO temperature
*/
#define PM8XXX_CHANNEL_INTERNAL 0x0c
#define PM8XXX_CHANNEL_125V 0x0d
#define PM8XXX_CHANNEL_INTERNAL_2 0x0e
#define PM8XXX_CHANNEL_MUXOFF 0x0f
/*
* PM8058 AMUX premux scaling, two bits. This is done of the channel before
* reaching the AMUX.
*/
#define PM8058_AMUX_PRESCALE_0 0x0 /* No scaling on the signal */
#define PM8058_AMUX_PRESCALE_1 0x1 /* Unity scaling selected by the user */
#define PM8058_AMUX_PRESCALE_1_DIV3 0x2 /* 1/3 prescaler on the input */
/* Defines reference voltage for the XOADC */
#define AMUX_RSV0 0x0 /* XO_IN/XOADC_GND, special selection to read XO temp */
#define AMUX_RSV1 0x1 /* PMIC_IN/XOADC_GND */
#define AMUX_RSV2 0x2 /* PMIC_IN/BMS_CSP */
#define AMUX_RSV3 0x3 /* not used */
#define AMUX_RSV4 0x4 /* XOADC_GND/XOADC_GND */
#define AMUX_RSV5 0x5 /* XOADC_VREF/XOADC_GND */
#define XOADC_RSV_MAX 5 /* 3 bits 0..7, 3 and 6,7 are invalid */
/**
* struct xoadc_channel - encodes channel properties and defaults
* @datasheet_name: the hardwarename of this channel
* @pre_scale_mux: prescale (PM8058) or premux (PM8921) for selecting
* this channel. Both this and the amux channel is needed to uniquely
* identify a channel. Values 0..3.
* @amux_channel: value of the ADC_ARB_USRP_AMUX_CNTRL register for this
* channel, bits 4..7, selects the amux, values 0..f
* @prescale: the channels have hard-coded prescale ratios defined
* by the hardware, this tells us what it is
* @type: corresponding IIO channel type, usually IIO_VOLTAGE or
* IIO_TEMP
* @scale_fn_type: the liner interpolation etc to convert the
* ADC code to the value that IIO expects, in uV or millicelsius
* etc. This scale function can be pretty elaborate if different
* thermistors are connected or other hardware characteristics are
* deployed.
* @amux_ip_rsv: ratiometric scale value used by the analog muxer: this
* selects the reference voltage for ratiometric scaling
*/
struct xoadc_channel {
const char *datasheet_name;
u8 pre_scale_mux:2;
u8 amux_channel:4;
const struct vadc_prescale_ratio prescale;
enum iio_chan_type type;
enum vadc_scale_fn_type scale_fn_type;
u8 amux_ip_rsv:3;
};
/**
* struct xoadc_variant - encodes the XOADC variant characteristics
* @name: name of this PMIC variant
* @channels: the hardware channels and respective settings and defaults
* @broken_ratiometric: if the PMIC has broken ratiometric scaling (this
* is a known problem on PM8058)
* @prescaling: this variant uses AMUX bits 2 & 3 for prescaling (PM8058)
* @second_level_mux: this variant uses AMUX bits 2 & 3 for a second level
* mux
*/
struct xoadc_variant {
const char name[16];
const struct xoadc_channel *channels;
bool broken_ratiometric;
bool prescaling;
bool second_level_mux;
};
/*
* XOADC_CHAN macro parameters:
* _dname: the name of the channel
* _presmux: prescaler (PM8058) or premux (PM8921) setting for this channel
* _amux: the value in bits 2..7 of the ADC_ARB_USRP_AMUX_CNTRL register
* for this channel. On some PMICs some of the bits select a prescaler, and
* on some PMICs some of the bits select various complex multiplex settings.
* _type: IIO channel type
* _prenum: prescaler numerator (dividend)
* _preden: prescaler denominator (divisor)
* _scale: scaling function type, this selects how the raw valued is mangled
* to output the actual processed measurement
* _amip: analog mux input parent when using ratiometric measurements
*/
#define XOADC_CHAN(_dname, _presmux, _amux, _type, _prenum, _preden, _scale, _amip) \
{ \
.datasheet_name = __stringify(_dname), \
.pre_scale_mux = _presmux, \
.amux_channel = _amux, \
.prescale = { .num = _prenum, .den = _preden }, \
.type = _type, \
.scale_fn_type = _scale, \
.amux_ip_rsv = _amip, \
}
/*
* Taken from arch/arm/mach-msm/board-9615.c in the vendor tree:
* TODO: incomplete, needs testing.
*/
static const struct xoadc_channel pm8018_xoadc_channels[] = {
XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VPH_PWR, 0x00, 0x02, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
/* Used for battery ID or battery temperature */
XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV2),
XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
{ }, /* Sentinel */
};
/*
* Taken from arch/arm/mach-msm/board-8930-pmic.c in the vendor tree:
* TODO: needs testing.
*/
static const struct xoadc_channel pm8038_xoadc_channels[] = {
XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ICHG, 0x00, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX5, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX6, 0x00, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX7, 0x00, 0x07, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* AMUX8 used for battery temperature in most cases */
XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_TEMP, 1, 1, SCALE_THERM_100K_PULLUP, AMUX_RSV2),
XOADC_CHAN(AMUX9, 0x00, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 4, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(INTERNAL_2, 0x00, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
{ }, /* Sentinel */
};
/*
* This was created by cross-referencing the vendor tree
* arch/arm/mach-msm/board-msm8x60.c msm_adc_channels_data[]
* with the "channel types" (first field) to find the right
* configuration for these channels on an MSM8x60 i.e. PM8058
* setup.
*/
static const struct xoadc_channel pm8058_xoadc_channels[] = {
XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 10, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ICHG, 0x00, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
/*
* AMUX channels 5 thru 9 are referred to as MPP5 thru MPP9 in
* some code and documentation. But they are really just 5
* channels just like any other. They are connected to a switching
* matrix where they can be routed to any of the MPPs, not just
* 1-to-1 onto MPP5 thru 9, so naming them MPP5 thru MPP9 is
* very confusing.
*/
XOADC_CHAN(AMUX5, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX6, 0x00, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX7, 0x00, 0x07, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX9, 0x00, 0x09, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(INTERNAL_2, 0x00, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
/* There are also "unity" and divided by 3 channels (prescaler) but noone is using them */
{ }, /* Sentinel */
};
/*
* The PM8921 has some pre-muxing on its channels, this comes from the vendor tree
* include/linux/mfd/pm8xxx/pm8xxx-adc.h
* board-flo-pmic.c (Nexus 7) and board-8064-pmic.c
*/
static const struct xoadc_channel pm8921_xoadc_channels[] = {
XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
/* channel "ICHG" is reserved and not used on PM8921 */
XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(IBAT, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* CHAN 6 & 7 (MPP1 & MPP2) are reserved for MPP channels on PM8921 */
XOADC_CHAN(BATT_THERM, 0x00, 0x08, IIO_TEMP, 1, 1, SCALE_THERM_100K_PULLUP, AMUX_RSV1),
XOADC_CHAN(BATT_ID, 0x00, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 4, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* FIXME: look into the scaling of this temperature */
XOADC_CHAN(CHG_TEMP, 0x00, 0x0e, IIO_TEMP, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
/* The following channels have premux bit 0 set to 1 (all end in 4) */
XOADC_CHAN(ATEST_8, 0x01, 0x00, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* Set scaling to 1/2 based on the name for these two */
XOADC_CHAN(USB_SNS_DIV20, 0x01, 0x01, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DCIN_SNS_DIV20, 0x01, 0x02, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX3, 0x01, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX4, 0x01, 0x04, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX5, 0x01, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX6, 0x01, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX7, 0x01, 0x07, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX8, 0x01, 0x08, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* Internal test signals, I think */
XOADC_CHAN(ATEST_1, 0x01, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_2, 0x01, 0x0a, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_3, 0x01, 0x0b, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_4, 0x01, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_5, 0x01, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_6, 0x01, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_7, 0x01, 0x0f, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
/* The following channels have premux bit 1 set to 1 (all end in 8) */
/* I guess even ATEST8 will be divided by 3 here */
XOADC_CHAN(ATEST_8, 0x02, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
/* I guess div 2 div 3 becomes div 6 */
XOADC_CHAN(USB_SNS_DIV20_DIV3, 0x02, 0x01, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(DCIN_SNS_DIV20_DIV3, 0x02, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX3_DIV3, 0x02, 0x03, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX4_DIV3, 0x02, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX5_DIV3, 0x02, 0x05, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX6_DIV3, 0x02, 0x06, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX7_DIV3, 0x02, 0x07, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(AMUX8_DIV3, 0x02, 0x08, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_1_DIV3, 0x02, 0x09, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_2_DIV3, 0x02, 0x0a, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_3_DIV3, 0x02, 0x0b, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_4_DIV3, 0x02, 0x0c, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_5_DIV3, 0x02, 0x0d, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_6_DIV3, 0x02, 0x0e, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
XOADC_CHAN(ATEST_7_DIV3, 0x02, 0x0f, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
{ }, /* Sentinel */
};
/**
* struct pm8xxx_chan_info - ADC channel information
* @name: name of this channel
* @hwchan: pointer to hardware channel information (muxing & scaling settings)
* @calibration: whether to use absolute or ratiometric calibration
* @scale_fn_type: scaling function type
* @decimation: 0,1,2,3
* @amux_ip_rsv: ratiometric scale value if using ratiometric
* calibration: 0, 1, 2, 4, 5.
*/
struct pm8xxx_chan_info {
const char *name;
const struct xoadc_channel *hwchan;
enum vadc_calibration calibration;
u8 decimation:2;
u8 amux_ip_rsv:3;
};
/**
* struct pm8xxx_xoadc - state container for the XOADC
* @dev: pointer to device
* @map: regmap to access registers
* @vref: reference voltage regulator
* characteristics of the channels, and sensible default settings
* @nchans: number of channels, configured by the device tree
* @chans: the channel information per-channel, configured by the device tree
* @iio_chans: IIO channel specifiers
* @graph: linear calibration parameters for absolute and
* ratiometric measurements
* @complete: completion to indicate end of conversion
* @lock: lock to restrict access to the hardware to one client at the time
*/
struct pm8xxx_xoadc {
struct device *dev;
struct regmap *map;
const struct xoadc_variant *variant;
struct regulator *vref;
unsigned int nchans;
struct pm8xxx_chan_info *chans;
struct iio_chan_spec *iio_chans;
struct vadc_linear_graph graph[2];
struct completion complete;
struct mutex lock;
};
static irqreturn_t pm8xxx_eoc_irq(int irq, void *d)
{
struct iio_dev *indio_dev = d;
struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
complete(&adc->complete);
return IRQ_HANDLED;
}
static struct pm8xxx_chan_info *
pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
{
struct pm8xxx_chan_info *ch;
int i;
for (i = 0; i < adc->nchans; i++) {
ch = &adc->chans[i];
if (ch->hwchan->amux_channel == chan)
break;
}
if (i == adc->nchans)
return NULL;
return ch;
}
static int pm8xxx_read_channel_rsv(struct pm8xxx_xoadc *adc,
const struct pm8xxx_chan_info *ch,
u8 rsv, u16 *adc_code,
bool force_ratiometric)
{
int ret;
unsigned int val;
u8 rsvmask, rsvval;
u8 lsb, msb;
dev_dbg(adc->dev, "read channel \"%s\", amux %d, prescale/mux: %d, rsv %d\n",
ch->name, ch->hwchan->amux_channel, ch->hwchan->pre_scale_mux, rsv);
mutex_lock(&adc->lock);
/* Mux in this channel */
val = ch->hwchan->amux_channel << ADC_AMUX_SEL_SHIFT;
val |= ch->hwchan->pre_scale_mux << ADC_AMUX_PREMUX_SHIFT;
ret = regmap_write(adc->map, ADC_ARB_USRP_AMUX_CNTRL, val);
if (ret)
goto unlock;
/* Set up ratiometric scale value, mask off all bits except these */
rsvmask = (ADC_ARB_USRP_RSV_RST | ADC_ARB_USRP_RSV_DTEST0 |
ADC_ARB_USRP_RSV_DTEST1 | ADC_ARB_USRP_RSV_OP);
if (adc->variant->broken_ratiometric && !force_ratiometric) {
/*
* Apparently the PM8058 has some kind of bug which is
* reflected in the vendor tree drivers/misc/pmix8058-xoadc.c
* which just hardcodes the RSV selector to SEL1 (0x20) for
* most cases and SEL0 (0x10) for the MUXOFF channel only.
* If we force ratiometric (currently only done when attempting
* to do ratiometric calibration) this doesn't seem to work
* very well and I suspect ratiometric conversion is simply
* broken or not supported on the PM8058.
*
* Maybe IO_SEL2 doesn't exist on PM8058 and bits 4 & 5 select
* the mode alone.
*
* Some PM8058 register documentation would be nice to get
* this right.
*/
if (ch->hwchan->amux_channel == PM8XXX_CHANNEL_MUXOFF)
rsvval = ADC_ARB_USRP_RSV_IP_SEL0;
else
rsvval = ADC_ARB_USRP_RSV_IP_SEL1;
} else {
if (rsv == 0xff)
rsvval = (ch->amux_ip_rsv << ADC_RSV_IP_SEL_SHIFT) |
ADC_ARB_USRP_RSV_TRM;
else
rsvval = (rsv << ADC_RSV_IP_SEL_SHIFT) |
ADC_ARB_USRP_RSV_TRM;
}
ret = regmap_update_bits(adc->map,
ADC_ARB_USRP_RSV,
~rsvmask,
rsvval);
if (ret)
goto unlock;
ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,
ADC_ARB_USRP_ANA_PARAM_DIS);
if (ret)
goto unlock;
/* Decimation factor */
ret = regmap_write(adc->map, ADC_ARB_USRP_DIG_PARAM,
ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT0 |
ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT1 |
ch->decimation << ADC_DIG_PARAM_DEC_SHIFT);
if (ret)
goto unlock;
ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,
ADC_ARB_USRP_ANA_PARAM_EN);
if (ret)
goto unlock;
/* Enable the arbiter, the Qualcomm code does it twice like this */
ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
ADC_ARB_USRP_CNTRL_EN_ARB);
if (ret)
goto unlock;
ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
ADC_ARB_USRP_CNTRL_EN_ARB);
if (ret)
goto unlock;
/* Fire a request! */
reinit_completion(&adc->complete);
ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
ADC_ARB_USRP_CNTRL_EN_ARB |
ADC_ARB_USRP_CNTRL_REQ);
if (ret)
goto unlock;
/* Next the interrupt occurs */
ret = wait_for_completion_timeout(&adc->complete,
VADC_CONV_TIME_MAX_US);
if (!ret) {
dev_err(adc->dev, "conversion timed out\n");
ret = -ETIMEDOUT;
goto unlock;
}
ret = regmap_read(adc->map, ADC_ARB_USRP_DATA0, &val);
if (ret)
goto unlock;
lsb = val;
ret = regmap_read(adc->map, ADC_ARB_USRP_DATA1, &val);
if (ret)
goto unlock;
msb = val;
*adc_code = (msb << 8) | lsb;
/* Turn off the ADC by setting the arbiter to 0 twice */
ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);
if (ret)
goto unlock;
ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);
if (ret)
goto unlock;
unlock:
mutex_unlock(&adc->lock);
return ret;
}
static int pm8xxx_read_channel(struct pm8xxx_xoadc *adc,
const struct pm8xxx_chan_info *ch,
u16 *adc_code)
{
/*
* Normally we just use the ratiometric scale value (RSV) predefined
* for the channel, but during calibration we need to modify this
* so this wrapper is a helper hiding the more complex version.
*/
return pm8xxx_read_channel_rsv(adc, ch, 0xff, adc_code, false);
}
static int pm8xxx_calibrate_device(struct pm8xxx_xoadc *adc)
{
const struct pm8xxx_chan_info *ch;
u16 read_1250v;
u16 read_0625v;
u16 read_nomux_rsv5;
u16 read_nomux_rsv4;
int ret;
adc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
adc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
/* Common reference channel calibration */
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);
if (!ch)
return -ENODEV;
ret = pm8xxx_read_channel(adc, ch, &read_1250v);
if (ret) {
dev_err(adc->dev, "could not read 1.25V reference channel\n");
return -ENODEV;
}
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);
if (!ch)
return -ENODEV;
ret = pm8xxx_read_channel(adc, ch, &read_0625v);
if (ret) {
dev_err(adc->dev, "could not read 0.625V reference channel\n");
return -ENODEV;
}
if (read_1250v == read_0625v) {
dev_err(adc->dev, "read same ADC code for 1.25V and 0.625V\n");
return -ENODEV;
}
adc->graph[VADC_CALIB_ABSOLUTE].dy = read_1250v - read_0625v;
adc->graph[VADC_CALIB_ABSOLUTE].gnd = read_0625v;
dev_info(adc->dev, "absolute calibration dx = %d uV, dy = %d units\n",
VADC_ABSOLUTE_RANGE_UV, adc->graph[VADC_CALIB_ABSOLUTE].dy);
/* Ratiometric calibration */
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);
if (!ch)
return -ENODEV;
ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV5,
&read_nomux_rsv5, true);
if (ret) {
dev_err(adc->dev, "could not read MUXOFF reference channel\n");
return -ENODEV;
}
ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV4,
&read_nomux_rsv4, true);
if (ret) {
dev_err(adc->dev, "could not read MUXOFF reference channel\n");
return -ENODEV;
}
adc->graph[VADC_CALIB_RATIOMETRIC].dy =
read_nomux_rsv5 - read_nomux_rsv4;
adc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_nomux_rsv4;
dev_info(adc->dev, "ratiometric calibration dx = %d, dy = %d units\n",
VADC_RATIOMETRIC_RANGE,
adc->graph[VADC_CALIB_RATIOMETRIC].dy);
return 0;
}
static int pm8xxx_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
const struct pm8xxx_chan_info *ch;
u16 adc_code;
int ret;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
ch = pm8xxx_get_channel(adc, chan->address);
if (!ch) {
dev_err(adc->dev, "no such channel %lu\n",
chan->address);
return -EINVAL;
}
ret = pm8xxx_read_channel(adc, ch, &adc_code);
if (ret)
return ret;
ret = qcom_vadc_scale(ch->hwchan->scale_fn_type,
&adc->graph[ch->calibration],
&ch->hwchan->prescale,
(ch->calibration == VADC_CALIB_ABSOLUTE),
adc_code, val);
if (ret)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_RAW:
ch = pm8xxx_get_channel(adc, chan->address);
if (!ch) {
dev_err(adc->dev, "no such channel %lu\n",
chan->address);
return -EINVAL;
}
ret = pm8xxx_read_channel(adc, ch, &adc_code);
if (ret)
return ret;
*val = (int)adc_code;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int pm8xxx_of_xlate(struct iio_dev *indio_dev,
const struct of_phandle_args *iiospec)
{
struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
u8 pre_scale_mux;
u8 amux_channel;
unsigned int i;
/*
* First cell is prescaler or premux, second cell is analog
* mux.
*/
if (iiospec->args_count != 2) {
dev_err(&indio_dev->dev, "wrong number of arguments for %s need 2 got %d\n",
iiospec->np->name,
iiospec->args_count);
return -EINVAL;
}
pre_scale_mux = (u8)iiospec->args[0];
amux_channel = (u8)iiospec->args[1];
dev_dbg(&indio_dev->dev, "pre scale/mux: %02x, amux: %02x\n",
pre_scale_mux, amux_channel);
/* We need to match exactly on the prescale/premux and channel */
for (i = 0; i < adc->nchans; i++)
if (adc->chans[i].hwchan->pre_scale_mux == pre_scale_mux &&
adc->chans[i].hwchan->amux_channel == amux_channel)
return i;
return -EINVAL;
}
static const struct iio_info pm8xxx_xoadc_info = {
.driver_module = THIS_MODULE,
.of_xlate = pm8xxx_of_xlate,
.read_raw = pm8xxx_read_raw,
};
static int pm8xxx_xoadc_parse_channel(struct device *dev,
struct device_node *np,
const struct xoadc_channel *hw_channels,
struct iio_chan_spec *iio_chan,
struct pm8xxx_chan_info *ch)
{
const char *name = np->name;
const struct xoadc_channel *hwchan;
u32 pre_scale_mux, amux_channel;
u32 rsv, dec;
int ret;
int chid;
ret = of_property_read_u32_index(np, "reg", 0, &pre_scale_mux);
if (ret) {
dev_err(dev, "invalid pre scale/mux number %s\n", name);
return ret;
}
ret = of_property_read_u32_index(np, "reg", 1, &amux_channel);
if (ret) {
dev_err(dev, "invalid amux channel number %s\n", name);
return ret;
}
/* Find the right channel setting */
chid = 0;
hwchan = &hw_channels[0];
while (hwchan && hwchan->datasheet_name) {
if (hwchan->pre_scale_mux == pre_scale_mux &&
hwchan->amux_channel == amux_channel)
break;
hwchan++;
chid++;
}
/* The sentinel does not have a name assigned */
if (!hwchan->datasheet_name) {
dev_err(dev, "could not locate channel %02x/%02x\n",
pre_scale_mux, amux_channel);
return -EINVAL;
}
ch->name = name;
ch->hwchan = hwchan;
/* Everyone seems to use absolute calibration except in special cases */
ch->calibration = VADC_CALIB_ABSOLUTE;
/* Everyone seems to use default ("type 2") decimation */
ch->decimation = VADC_DEF_DECIMATION;
if (!of_property_read_u32(np, "qcom,ratiometric", &rsv)) {
ch->calibration = VADC_CALIB_RATIOMETRIC;
if (rsv > XOADC_RSV_MAX) {
dev_err(dev, "%s too large RSV value %d\n", name, rsv);
return -EINVAL;
}
if (rsv == AMUX_RSV3) {
dev_err(dev, "%s invalid RSV value %d\n", name, rsv);
return -EINVAL;
}
}
/* Optional decimation, if omitted we use the default */
ret = of_property_read_u32(np, "qcom,decimation", &dec);
if (!ret) {
ret = qcom_vadc_decimation_from_dt(dec);
if (ret < 0) {
dev_err(dev, "%s invalid decimation %d\n",
name, dec);
return ret;
}
ch->decimation = ret;
}
iio_chan->channel = chid;
iio_chan->address = hwchan->amux_channel;
iio_chan->datasheet_name = hwchan->datasheet_name;
iio_chan->type = hwchan->type;
/* All channels are raw or processed */
iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_PROCESSED);
iio_chan->indexed = 1;
dev_dbg(dev, "channel [PRESCALE/MUX: %02x AMUX: %02x] \"%s\" "
"ref voltage: %d, decimation %d "
"prescale %d/%d, scale function %d\n",
hwchan->pre_scale_mux, hwchan->amux_channel, ch->name,
ch->amux_ip_rsv, ch->decimation, hwchan->prescale.num,
hwchan->prescale.den, hwchan->scale_fn_type);
return 0;
}
static int pm8xxx_xoadc_parse_channels(struct pm8xxx_xoadc *adc,
struct device_node *np)
{
struct device_node *child;
struct pm8xxx_chan_info *ch;
int ret;
int i;
adc->nchans = of_get_available_child_count(np);
if (!adc->nchans) {
dev_err(adc->dev, "no channel children\n");
return -ENODEV;
}
dev_dbg(adc->dev, "found %d ADC channels\n", adc->nchans);
adc->iio_chans = devm_kcalloc(adc->dev, adc->nchans,
sizeof(*adc->iio_chans), GFP_KERNEL);
if (!adc->iio_chans)
return -ENOMEM;
adc->chans = devm_kcalloc(adc->dev, adc->nchans,
sizeof(*adc->chans), GFP_KERNEL);
if (!adc->chans)
return -ENOMEM;
i = 0;
for_each_available_child_of_node(np, child) {
ch = &adc->chans[i];
ret = pm8xxx_xoadc_parse_channel(adc->dev, child,
adc->variant->channels,
&adc->iio_chans[i],
ch);
if (ret) {
of_node_put(child);
return ret;
}
i++;
}
/* Check for required channels */
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);
if (!ch) {
dev_err(adc->dev, "missing 1.25V reference channel\n");
return -ENODEV;
}
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);
if (!ch) {
dev_err(adc->dev, "missing 0.625V reference channel\n");
return -ENODEV;
}
ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);
if (!ch) {
dev_err(adc->dev, "missing MUXOFF reference channel\n");
return -ENODEV;
}
return 0;
}
static int pm8xxx_xoadc_probe(struct platform_device *pdev)
{
const struct xoadc_variant *variant;
struct pm8xxx_xoadc *adc;
struct iio_dev *indio_dev;
struct device_node *np = pdev->dev.of_node;
struct regmap *map;
struct device *dev = &pdev->dev;
int ret;
variant = of_device_get_match_data(dev);
if (!variant)
return -ENODEV;
indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
if (!indio_dev)
return -ENOMEM;
platform_set_drvdata(pdev, indio_dev);
adc = iio_priv(indio_dev);
adc->dev = dev;
adc->variant = variant;
init_completion(&adc->complete);
mutex_init(&adc->lock);
ret = pm8xxx_xoadc_parse_channels(adc, np);
if (ret)
return ret;
map = dev_get_regmap(dev->parent, NULL);
if (!map) {
dev_err(dev, "parent regmap unavailable.\n");
return -ENXIO;
}
adc->map = map;
/* Bring up regulator */
adc->vref = devm_regulator_get(dev, "xoadc-ref");
if (IS_ERR(adc->vref)) {
dev_err(dev, "failed to get XOADC VREF regulator\n");
return PTR_ERR(adc->vref);
}
ret = regulator_enable(adc->vref);
if (ret) {
dev_err(dev, "failed to enable XOADC VREF regulator\n");
return ret;
}
ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0),
pm8xxx_eoc_irq, NULL, 0, variant->name, indio_dev);
if (ret) {
dev_err(dev, "unable to request IRQ\n");
goto out_disable_vref;
}
indio_dev->dev.parent = dev;
indio_dev->dev.of_node = np;
indio_dev->name = variant->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &pm8xxx_xoadc_info;
indio_dev->channels = adc->iio_chans;
indio_dev->num_channels = adc->nchans;
ret = iio_device_register(indio_dev);
if (ret)
goto out_disable_vref;
ret = pm8xxx_calibrate_device(adc);
if (ret)
goto out_unreg_device;
dev_info(dev, "%s XOADC driver enabled\n", variant->name);
return 0;
out_unreg_device:
iio_device_unregister(indio_dev);
out_disable_vref:
regulator_disable(adc->vref);
return ret;
}
static int pm8xxx_xoadc_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
regulator_disable(adc->vref);
return 0;
}
static const struct xoadc_variant pm8018_variant = {
.name = "PM8018-XOADC",
.channels = pm8018_xoadc_channels,
};
static const struct xoadc_variant pm8038_variant = {
.name = "PM8038-XOADC",
.channels = pm8038_xoadc_channels,
};
static const struct xoadc_variant pm8058_variant = {
.name = "PM8058-XOADC",
.channels = pm8058_xoadc_channels,
.broken_ratiometric = true,
.prescaling = true,
};
static const struct xoadc_variant pm8921_variant = {
.name = "PM8921-XOADC",
.channels = pm8921_xoadc_channels,
.second_level_mux = true,
};
static const struct of_device_id pm8xxx_xoadc_id_table[] = {
{
.compatible = "qcom,pm8018-adc",
.data = &pm8018_variant,
},
{
.compatible = "qcom,pm8038-adc",
.data = &pm8038_variant,
},
{
.compatible = "qcom,pm8058-adc",
.data = &pm8058_variant,
},
{
.compatible = "qcom,pm8921-adc",
.data = &pm8921_variant,
},
{ },
};
MODULE_DEVICE_TABLE(of, pm8xxx_xoadc_id_table);
static struct platform_driver pm8xxx_xoadc_driver = {
.driver = {
.name = "pm8xxx-adc",
.of_match_table = pm8xxx_xoadc_id_table,
},
.probe = pm8xxx_xoadc_probe,
.remove = pm8xxx_xoadc_remove,
};
module_platform_driver(pm8xxx_xoadc_driver);
MODULE_DESCRIPTION("PM8xxx XOADC driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pm8xxx-xoadc");
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