drivers/iio/adc/qcom-pm8xxx-xoadc.c

   1 /*
   2  * Qualcomm PM8xxx PMIC XOADC driver
   3  *
   4  * These ADCs are known as HK/XO (house keeping / chrystal oscillator)
   5  * "XO" in "XOADC" means Chrystal Oscillator. It's a bunch of
   6  * specific-purpose and general purpose ADC converters and channels.
   7  *
   8  * Copyright (C) 2017 Linaro Ltd.
   9  * Author: Linus Walleij <linus.walleij@linaro.org>
  10  */
  11
  12 #include <linux/iio/iio.h>
  13 #include <linux/iio/sysfs.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/regulator/consumer.h>
  22
  23 #include "qcom-vadc-common.h"
  24
  25 /*
  26  * Definitions for the "user processor" registers lifted from the v3.4
  27  * Qualcomm tree. Their kernel has two out-of-tree drivers for the ADC:
  28  * drivers/misc/pmic8058-xoadc.c
  29  * drivers/hwmon/pm8xxx-adc.c
  30  * None of them contain any complete register specification, so this is
  31  * a best effort of combining the information.
  32  */
  33
  34 /* These appear to be "battery monitor" registers */
  35 #define ADC_ARB_BTM_CNTRL1                      0x17e
  36 #define ADC_ARB_BTM_CNTRL1_EN_BTM               BIT(0)
  37 #define ADC_ARB_BTM_CNTRL1_SEL_OP_MODE          BIT(1)
  38 #define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL1       BIT(2)
  39 #define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL2       BIT(3)
  40 #define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL3       BIT(4)
  41 #define ADC_ARB_BTM_CNTRL1_MEAS_INTERVAL4       BIT(5)
  42 #define ADC_ARB_BTM_CNTRL1_EOC                  BIT(6)
  43 #define ADC_ARB_BTM_CNTRL1_REQ                  BIT(7)
  44
  45 #define ADC_ARB_BTM_AMUX_CNTRL                  0x17f
  46 #define ADC_ARB_BTM_ANA_PARAM                   0x180
  47 #define ADC_ARB_BTM_DIG_PARAM                   0x181
  48 #define ADC_ARB_BTM_RSV                         0x182
  49 #define ADC_ARB_BTM_DATA1                       0x183
  50 #define ADC_ARB_BTM_DATA0                       0x184
  51 #define ADC_ARB_BTM_BAT_COOL_THR1               0x185
  52 #define ADC_ARB_BTM_BAT_COOL_THR0               0x186
  53 #define ADC_ARB_BTM_BAT_WARM_THR1               0x187
  54 #define ADC_ARB_BTM_BAT_WARM_THR0               0x188
  55 #define ADC_ARB_BTM_CNTRL2                      0x18c
  56
  57 /* Proper ADC registers */
  58
  59 #define ADC_ARB_USRP_CNTRL                      0x197
  60 #define ADC_ARB_USRP_CNTRL_EN_ARB               BIT(0)
  61 #define ADC_ARB_USRP_CNTRL_RSV1                 BIT(1)
  62 #define ADC_ARB_USRP_CNTRL_RSV2                 BIT(2)
  63 #define ADC_ARB_USRP_CNTRL_RSV3                 BIT(3)
  64 #define ADC_ARB_USRP_CNTRL_RSV4                 BIT(4)
  65 #define ADC_ARB_USRP_CNTRL_RSV5                 BIT(5)
  66 #define ADC_ARB_USRP_CNTRL_EOC                  BIT(6)
  67 #define ADC_ARB_USRP_CNTRL_REQ                  BIT(7)
  68
  69 #define ADC_ARB_USRP_AMUX_CNTRL                 0x198
  70 /*
  71  * The channel mask includes the bits selecting channel mux and prescaler
  72  * on PM8058, or channel mux and premux on PM8921.
  73  */
  74 #define ADC_ARB_USRP_AMUX_CNTRL_CHAN_MASK       0xfc
  75 #define ADC_ARB_USRP_AMUX_CNTRL_RSV0            BIT(0)
  76 #define ADC_ARB_USRP_AMUX_CNTRL_RSV1            BIT(1)
  77 /* On PM8058 this is prescaling, on PM8921 this is premux */
  78 #define ADC_ARB_USRP_AMUX_CNTRL_PRESCALEMUX0    BIT(2)
  79 #define ADC_ARB_USRP_AMUX_CNTRL_PRESCALEMUX1    BIT(3)
  80 #define ADC_ARB_USRP_AMUX_CNTRL_SEL0            BIT(4)
  81 #define ADC_ARB_USRP_AMUX_CNTRL_SEL1            BIT(5)
  82 #define ADC_ARB_USRP_AMUX_CNTRL_SEL2            BIT(6)
  83 #define ADC_ARB_USRP_AMUX_CNTRL_SEL3            BIT(7)
  84 #define ADC_AMUX_PREMUX_SHIFT                   2
  85 #define ADC_AMUX_SEL_SHIFT                      4
  86
  87 /* We know very little about the bits in this register */
  88 #define ADC_ARB_USRP_ANA_PARAM                  0x199
  89 #define ADC_ARB_USRP_ANA_PARAM_DIS              0xFE
  90 #define ADC_ARB_USRP_ANA_PARAM_EN               0xFF
  91
  92 #define ADC_ARB_USRP_DIG_PARAM                  0x19A
  93 #define ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT0       BIT(0)
  94 #define ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT1       BIT(1)
  95 #define ADC_ARB_USRP_DIG_PARAM_CLK_RATE0        BIT(2)
  96 #define ADC_ARB_USRP_DIG_PARAM_CLK_RATE1        BIT(3)
  97 #define ADC_ARB_USRP_DIG_PARAM_EOC              BIT(4)
  98 /*
  99  * On a later ADC the decimation factors are defined as
 100  * 00 = 512, 01 = 1024, 10 = 2048, 11 = 4096 so assume this
 101  * holds also for this older XOADC.
 102  */
 103 #define ADC_ARB_USRP_DIG_PARAM_DEC_RATE0        BIT(5)
 104 #define ADC_ARB_USRP_DIG_PARAM_DEC_RATE1        BIT(6)
 105 #define ADC_ARB_USRP_DIG_PARAM_EN               BIT(7)
 106 #define ADC_DIG_PARAM_DEC_SHIFT                 5
 107
 108 #define ADC_ARB_USRP_RSV                        0x19B
 109 #define ADC_ARB_USRP_RSV_RST                    BIT(0)
 110 #define ADC_ARB_USRP_RSV_DTEST0                 BIT(1)
 111 #define ADC_ARB_USRP_RSV_DTEST1                 BIT(2)
 112 #define ADC_ARB_USRP_RSV_OP                     BIT(3)
 113 #define ADC_ARB_USRP_RSV_IP_SEL0                BIT(4)
 114 #define ADC_ARB_USRP_RSV_IP_SEL1                BIT(5)
 115 #define ADC_ARB_USRP_RSV_IP_SEL2                BIT(6)
 116 #define ADC_ARB_USRP_RSV_TRM                    BIT(7)
 117 #define ADC_RSV_IP_SEL_SHIFT                    4
 118
 119 #define ADC_ARB_USRP_DATA0                      0x19D
 120 #define ADC_ARB_USRP_DATA1                      0x19C
 121
 122 /**
 123  * Physical channels which MUST exist on all PM variants in order to provide
 124  * proper reference points for calibration.
 125  *
 126  * @PM8XXX_CHANNEL_INTERNAL: 625mV reference channel
 127  * @PM8XXX_CHANNEL_125V: 1250mV reference channel
 128  * @PM8XXX_CHANNEL_INTERNAL_2: 325mV reference channel
 129  * @PM8XXX_CHANNEL_MUXOFF: channel to reduce input load on mux, apparently also
 130  * measures XO temperature
 131  */
 132 #define PM8XXX_CHANNEL_INTERNAL         0x0c
 133 #define PM8XXX_CHANNEL_125V             0x0d
 134 #define PM8XXX_CHANNEL_INTERNAL_2       0x0e
 135 #define PM8XXX_CHANNEL_MUXOFF           0x0f
 136
 137 /*
 138  * PM8058 AMUX premux scaling, two bits. This is done of the channel before
 139  * reaching the AMUX.
 140  */
 141 #define PM8058_AMUX_PRESCALE_0 0x0 /* No scaling on the signal */
 142 #define PM8058_AMUX_PRESCALE_1 0x1 /* Unity scaling selected by the user */
 143 #define PM8058_AMUX_PRESCALE_1_DIV3 0x2 /* 1/3 prescaler on the input */
 144
 145 /* Defines reference voltage for the XOADC */
 146 #define AMUX_RSV0 0x0 /* XO_IN/XOADC_GND, special selection to read XO temp */
 147 #define AMUX_RSV1 0x1 /* PMIC_IN/XOADC_GND */
 148 #define AMUX_RSV2 0x2 /* PMIC_IN/BMS_CSP */
 149 #define AMUX_RSV3 0x3 /* not used */
 150 #define AMUX_RSV4 0x4 /* XOADC_GND/XOADC_GND */
 151 #define AMUX_RSV5 0x5 /* XOADC_VREF/XOADC_GND */
 152 #define XOADC_RSV_MAX 5 /* 3 bits 0..7, 3 and 6,7 are invalid */
 153
 154 /**
 155  * struct xoadc_channel - encodes channel properties and defaults
 156  * @datasheet_name: the hardwarename of this channel
 157  * @pre_scale_mux: prescale (PM8058) or premux (PM8921) for selecting
 158  * this channel. Both this and the amux channel is needed to uniquely
 159  * identify a channel. Values 0..3.
 160  * @amux_channel: value of the ADC_ARB_USRP_AMUX_CNTRL register for this
 161  * channel, bits 4..7, selects the amux, values 0..f
 162  * @prescale: the channels have hard-coded prescale ratios defined
 163  * by the hardware, this tells us what it is
 164  * @type: corresponding IIO channel type, usually IIO_VOLTAGE or
 165  * IIO_TEMP
 166  * @scale_fn_type: the liner interpolation etc to convert the
 167  * ADC code to the value that IIO expects, in uV or millicelsius
 168  * etc. This scale function can be pretty elaborate if different
 169  * thermistors are connected or other hardware characteristics are
 170  * deployed.
 171  * @amux_ip_rsv: ratiometric scale value used by the analog muxer: this
 172  * selects the reference voltage for ratiometric scaling
 173  */
 174 struct xoadc_channel {
 175         const char *datasheet_name;
 176         u8 pre_scale_mux:2;
 177         u8 amux_channel:4;
 178         const struct vadc_prescale_ratio prescale;
 179         enum iio_chan_type type;
 180         enum vadc_scale_fn_type scale_fn_type;
 181         u8 amux_ip_rsv:3;
 182 };
 183
 184 /**
 185  * struct xoadc_variant - encodes the XOADC variant characteristics
 186  * @name: name of this PMIC variant
 187  * @channels: the hardware channels and respective settings and defaults
 188  * @broken_ratiometric: if the PMIC has broken ratiometric scaling (this
 189  * is a known problem on PM8058)
 190  * @prescaling: this variant uses AMUX bits 2 & 3 for prescaling (PM8058)
 191  * @second_level_mux: this variant uses AMUX bits 2 & 3 for a second level
 192  * mux
 193  */
 194 struct xoadc_variant {
 195         const char name[16];
 196         const struct xoadc_channel *channels;
 197         bool broken_ratiometric;
 198         bool prescaling;
 199         bool second_level_mux;
 200 };
 201
 202 /*
 203  * XOADC_CHAN macro parameters:
 204  * _dname: the name of the channel
 205  * _presmux: prescaler (PM8058) or premux (PM8921) setting for this channel
 206  * _amux: the value in bits 2..7 of the ADC_ARB_USRP_AMUX_CNTRL register
 207  * for this channel. On some PMICs some of the bits select a prescaler, and
 208  * on some PMICs some of the bits select various complex multiplex settings.
 209  * _type: IIO channel type
 210  * _prenum: prescaler numerator (dividend)
 211  * _preden: prescaler denominator (divisor)
 212  * _scale: scaling function type, this selects how the raw valued is mangled
 213  * to output the actual processed measurement
 214  * _amip: analog mux input parent when using ratiometric measurements
 215  */
 216 #define XOADC_CHAN(_dname, _presmux, _amux, _type, _prenum, _preden, _scale, _amip) \
 217         {                                                               \
 218                 .datasheet_name = __stringify(_dname),                  \
 219                 .pre_scale_mux = _presmux,                              \
 220                 .amux_channel = _amux,                                  \
 221                 .prescale = { .num = _prenum, .den = _preden },         \
 222                 .type = _type,                                          \
 223                 .scale_fn_type = _scale,                                \
 224                 .amux_ip_rsv = _amip,                                   \
 225         }
 226
 227 /*
 228  * Taken from arch/arm/mach-msm/board-9615.c in the vendor tree:
 229  * TODO: incomplete, needs testing.
 230  */
 231 static const struct xoadc_channel pm8018_xoadc_channels[] = {
 232         XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 233         XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 234         XOADC_CHAN(VPH_PWR, 0x00, 0x02, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 235         XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
 236         /* Used for battery ID or battery temperature */
 237         XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV2),
 238         XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 239         XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 240         XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
 241         { }, /* Sentinel */
 242 };
 243
 244 /*
 245  * Taken from arch/arm/mach-msm/board-8930-pmic.c in the vendor tree:
 246  * TODO: needs testing.
 247  */
 248 static const struct xoadc_channel pm8038_xoadc_channels[] = {
 249         XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 250         XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 251         XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
 252         XOADC_CHAN(ICHG, 0x00, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 253         XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 254         XOADC_CHAN(AMUX5, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 255         XOADC_CHAN(AMUX6, 0x00, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 256         XOADC_CHAN(AMUX7, 0x00, 0x07, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 257         /* AMUX8 used for battery temperature in most cases */
 258         XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_TEMP, 1, 1, SCALE_THERM_100K_PULLUP, AMUX_RSV2),
 259         XOADC_CHAN(AMUX9, 0x00, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 260         XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 4, SCALE_DEFAULT, AMUX_RSV1),
 261         XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
 262         XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 263         XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 264         XOADC_CHAN(INTERNAL_2, 0x00, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 265         XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
 266         { }, /* Sentinel */
 267 };
 268
 269 /*
 270  * This was created by cross-referencing the vendor tree
 271  * arch/arm/mach-msm/board-msm8x60.c msm_adc_channels_data[]
 272  * with the "channel types" (first field) to find the right
 273  * configuration for these channels on an MSM8x60 i.e. PM8058
 274  * setup.
 275  */
 276 static const struct xoadc_channel pm8058_xoadc_channels[] = {
 277         XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
 278         XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 279         XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 10, SCALE_DEFAULT, AMUX_RSV1),
 280         XOADC_CHAN(ICHG, 0x00, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 281         XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 282         /*
 283          * AMUX channels 5 thru 9 are referred to as MPP5 thru MPP9 in
 284          * some code and documentation. But they are really just 5
 285          * channels just like any other. They are connected to a switching
 286          * matrix where they can be routed to any of the MPPs, not just
 287          * 1-to-1 onto MPP5 thru 9, so naming them MPP5 thru MPP9 is
 288          * very confusing.
 289          */
 290         XOADC_CHAN(AMUX5, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 291         XOADC_CHAN(AMUX6, 0x00, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 292         XOADC_CHAN(AMUX7, 0x00, 0x07, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
 293         XOADC_CHAN(AMUX8, 0x00, 0x08, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
 294         XOADC_CHAN(AMUX9, 0x00, 0x09, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 295         XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 296         XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
 297         XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 298         XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 299         XOADC_CHAN(INTERNAL_2, 0x00, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 300         XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
 301         /* There are also "unity" and divided by 3 channels (prescaler) but noone is using them */
 302         { }, /* Sentinel */
 303 };
 304
 305 /*
 306  * The PM8921 has some pre-muxing on its channels, this comes from the vendor tree
 307  * include/linux/mfd/pm8xxx/pm8xxx-adc.h
 308  * board-flo-pmic.c (Nexus 7) and board-8064-pmic.c
 309  */
 310 static const struct xoadc_channel pm8921_xoadc_channels[] = {
 311         XOADC_CHAN(VCOIN, 0x00, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 312         XOADC_CHAN(VBAT, 0x00, 0x01, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 313         XOADC_CHAN(DCIN, 0x00, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
 314         /* channel "ICHG" is reserved and not used on PM8921 */
 315         XOADC_CHAN(VPH_PWR, 0x00, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 316         XOADC_CHAN(IBAT, 0x00, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 317         /* CHAN 6 & 7 (MPP1 & MPP2) are reserved for MPP channels on PM8921 */
 318         XOADC_CHAN(BATT_THERM, 0x00, 0x08, IIO_TEMP, 1, 1, SCALE_THERM_100K_PULLUP, AMUX_RSV1),
 319         XOADC_CHAN(BATT_ID, 0x00, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 320         XOADC_CHAN(USB_VBUS, 0x00, 0x0a, IIO_VOLTAGE, 1, 4, SCALE_DEFAULT, AMUX_RSV1),
 321         XOADC_CHAN(DIE_TEMP, 0x00, 0x0b, IIO_TEMP, 1, 1, SCALE_PMIC_THERM, AMUX_RSV1),
 322         XOADC_CHAN(INTERNAL, 0x00, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 323         XOADC_CHAN(125V, 0x00, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 324         /* FIXME: look into the scaling of this temperature */
 325         XOADC_CHAN(CHG_TEMP, 0x00, 0x0e, IIO_TEMP, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 326         XOADC_CHAN(MUXOFF, 0x00, 0x0f, IIO_TEMP, 1, 1, SCALE_XOTHERM, AMUX_RSV0),
 327         /* The following channels have premux bit 0 set to 1 (all end in 4) */
 328         XOADC_CHAN(ATEST_8, 0x01, 0x00, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 329         /* Set scaling to 1/2 based on the name for these two */
 330         XOADC_CHAN(USB_SNS_DIV20, 0x01, 0x01, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
 331         XOADC_CHAN(DCIN_SNS_DIV20, 0x01, 0x02, IIO_VOLTAGE, 1, 2, SCALE_DEFAULT, AMUX_RSV1),
 332         XOADC_CHAN(AMUX3, 0x01, 0x03, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 333         XOADC_CHAN(AMUX4, 0x01, 0x04, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 334         XOADC_CHAN(AMUX5, 0x01, 0x05, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 335         XOADC_CHAN(AMUX6, 0x01, 0x06, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 336         XOADC_CHAN(AMUX7, 0x01, 0x07, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 337         XOADC_CHAN(AMUX8, 0x01, 0x08, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 338         /* Internal test signals, I think */
 339         XOADC_CHAN(ATEST_1, 0x01, 0x09, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 340         XOADC_CHAN(ATEST_2, 0x01, 0x0a, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 341         XOADC_CHAN(ATEST_3, 0x01, 0x0b, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 342         XOADC_CHAN(ATEST_4, 0x01, 0x0c, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 343         XOADC_CHAN(ATEST_5, 0x01, 0x0d, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 344         XOADC_CHAN(ATEST_6, 0x01, 0x0e, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 345         XOADC_CHAN(ATEST_7, 0x01, 0x0f, IIO_VOLTAGE, 1, 1, SCALE_DEFAULT, AMUX_RSV1),
 346         /* The following channels have premux bit 1 set to 1 (all end in 8) */
 347         /* I guess even ATEST8 will be divided by 3 here */
 348         XOADC_CHAN(ATEST_8, 0x02, 0x00, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 349         /* I guess div 2 div 3 becomes div 6 */
 350         XOADC_CHAN(USB_SNS_DIV20_DIV3, 0x02, 0x01, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
 351         XOADC_CHAN(DCIN_SNS_DIV20_DIV3, 0x02, 0x02, IIO_VOLTAGE, 1, 6, SCALE_DEFAULT, AMUX_RSV1),
 352         XOADC_CHAN(AMUX3_DIV3, 0x02, 0x03, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 353         XOADC_CHAN(AMUX4_DIV3, 0x02, 0x04, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 354         XOADC_CHAN(AMUX5_DIV3, 0x02, 0x05, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 355         XOADC_CHAN(AMUX6_DIV3, 0x02, 0x06, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 356         XOADC_CHAN(AMUX7_DIV3, 0x02, 0x07, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 357         XOADC_CHAN(AMUX8_DIV3, 0x02, 0x08, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 358         XOADC_CHAN(ATEST_1_DIV3, 0x02, 0x09, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 359         XOADC_CHAN(ATEST_2_DIV3, 0x02, 0x0a, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 360         XOADC_CHAN(ATEST_3_DIV3, 0x02, 0x0b, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 361         XOADC_CHAN(ATEST_4_DIV3, 0x02, 0x0c, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 362         XOADC_CHAN(ATEST_5_DIV3, 0x02, 0x0d, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 363         XOADC_CHAN(ATEST_6_DIV3, 0x02, 0x0e, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 364         XOADC_CHAN(ATEST_7_DIV3, 0x02, 0x0f, IIO_VOLTAGE, 1, 3, SCALE_DEFAULT, AMUX_RSV1),
 365         { }, /* Sentinel */
 366 };
 367
 368 /**
 369  * struct pm8xxx_chan_info - ADC channel information
 370  * @name: name of this channel
 371  * @hwchan: pointer to hardware channel information (muxing & scaling settings)
 372  * @calibration: whether to use absolute or ratiometric calibration
 373  * @scale_fn_type: scaling function type
 374  * @decimation: 0,1,2,3
 375  * @amux_ip_rsv: ratiometric scale value if using ratiometric
 376  * calibration: 0, 1, 2, 4, 5.
 377  */
 378 struct pm8xxx_chan_info {
 379         const char *name;
 380         const struct xoadc_channel *hwchan;
 381         enum vadc_calibration calibration;
 382         u8 decimation:2;
 383         u8 amux_ip_rsv:3;
 384 };
 385
 386 /**
 387  * struct pm8xxx_xoadc - state container for the XOADC
 388  * @dev: pointer to device
 389  * @map: regmap to access registers
 390  * @vref: reference voltage regulator
 391  * characteristics of the channels, and sensible default settings
 392  * @nchans: number of channels, configured by the device tree
 393  * @chans: the channel information per-channel, configured by the device tree
 394  * @iio_chans: IIO channel specifiers
 395  * @graph: linear calibration parameters for absolute and
 396  * ratiometric measurements
 397  * @complete: completion to indicate end of conversion
 398  * @lock: lock to restrict access to the hardware to one client at the time
 399  */
 400 struct pm8xxx_xoadc {
 401         struct device *dev;
 402         struct regmap *map;
 403         const struct xoadc_variant *variant;
 404         struct regulator *vref;
 405         unsigned int nchans;
 406         struct pm8xxx_chan_info *chans;
 407         struct iio_chan_spec *iio_chans;
 408         struct vadc_linear_graph graph[2];
 409         struct completion complete;
 410         struct mutex lock;
 411 };
 412
 413 static irqreturn_t pm8xxx_eoc_irq(int irq, void *d)
 414 {
 415         struct iio_dev *indio_dev = d;
 416         struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
 417
 418         complete(&adc->complete);
 419
 420         return IRQ_HANDLED;
 421 }
 422
 423 static struct pm8xxx_chan_info *
 424 pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
 425 {
 426         struct pm8xxx_chan_info *ch;
 427         int i;
 428
 429         for (i = 0; i < adc->nchans; i++) {
 430                 ch = &adc->chans[i];
 431                 if (ch->hwchan->amux_channel == chan)
 432                         break;
 433         }
 434         if (i == adc->nchans)
 435                 return NULL;
 436
 437         return ch;
 438 }
 439
 440 static int pm8xxx_read_channel_rsv(struct pm8xxx_xoadc *adc,
 441                                    const struct pm8xxx_chan_info *ch,
 442                                    u8 rsv, u16 *adc_code,
 443                                    bool force_ratiometric)
 444 {
 445         int ret;
 446         unsigned int val;
 447         u8 rsvmask, rsvval;
 448         u8 lsb, msb;
 449
 450         dev_dbg(adc->dev, "read channel \"%s\", amux %d, prescale/mux: %d, rsv %d\n",
 451                 ch->name, ch->hwchan->amux_channel, ch->hwchan->pre_scale_mux, rsv);
 452
 453         mutex_lock(&adc->lock);
 454
 455         /* Mux in this channel */
 456         val = ch->hwchan->amux_channel << ADC_AMUX_SEL_SHIFT;
 457         val |= ch->hwchan->pre_scale_mux << ADC_AMUX_PREMUX_SHIFT;
 458         ret = regmap_write(adc->map, ADC_ARB_USRP_AMUX_CNTRL, val);
 459         if (ret)
 460                 goto unlock;
 461
 462         /* Set up ratiometric scale value, mask off all bits except these */
 463         rsvmask = (ADC_ARB_USRP_RSV_RST | ADC_ARB_USRP_RSV_DTEST0 |
 464                    ADC_ARB_USRP_RSV_DTEST1 | ADC_ARB_USRP_RSV_OP);
 465         if (adc->variant->broken_ratiometric && !force_ratiometric) {
 466                 /*
 467                  * Apparently the PM8058 has some kind of bug which is
 468                  * reflected in the vendor tree drivers/misc/pmix8058-xoadc.c
 469                  * which just hardcodes the RSV selector to SEL1 (0x20) for
 470                  * most cases and SEL0 (0x10) for the MUXOFF channel only.
 471                  * If we force ratiometric (currently only done when attempting
 472                  * to do ratiometric calibration) this doesn't seem to work
 473                  * very well and I suspect ratiometric conversion is simply
 474                  * broken or not supported on the PM8058.
 475                  *
 476                  * Maybe IO_SEL2 doesn't exist on PM8058 and bits 4 & 5 select
 477                  * the mode alone.
 478                  *
 479                  * Some PM8058 register documentation would be nice to get
 480                  * this right.
 481                  */
 482                 if (ch->hwchan->amux_channel == PM8XXX_CHANNEL_MUXOFF)
 483                         rsvval = ADC_ARB_USRP_RSV_IP_SEL0;
 484                 else
 485                         rsvval = ADC_ARB_USRP_RSV_IP_SEL1;
 486         } else {
 487                 if (rsv == 0xff)
 488                         rsvval = (ch->amux_ip_rsv << ADC_RSV_IP_SEL_SHIFT) |
 489                                 ADC_ARB_USRP_RSV_TRM;
 490                 else
 491                         rsvval = (rsv << ADC_RSV_IP_SEL_SHIFT) |
 492                                 ADC_ARB_USRP_RSV_TRM;
 493         }
 494
 495         ret = regmap_update_bits(adc->map,
 496                                  ADC_ARB_USRP_RSV,
 497                                  ~rsvmask,
 498                                  rsvval);
 499         if (ret)
 500                 goto unlock;
 501
 502         ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,
 503                            ADC_ARB_USRP_ANA_PARAM_DIS);
 504         if (ret)
 505                 goto unlock;
 506
 507         /* Decimation factor */
 508         ret = regmap_write(adc->map, ADC_ARB_USRP_DIG_PARAM,
 509                            ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT0 |
 510                            ADC_ARB_USRP_DIG_PARAM_SEL_SHIFT1 |
 511                            ch->decimation << ADC_DIG_PARAM_DEC_SHIFT);
 512         if (ret)
 513                 goto unlock;
 514
 515         ret = regmap_write(adc->map, ADC_ARB_USRP_ANA_PARAM,
 516                            ADC_ARB_USRP_ANA_PARAM_EN);
 517         if (ret)
 518                 goto unlock;
 519
 520         /* Enable the arbiter, the Qualcomm code does it twice like this */
 521         ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
 522                            ADC_ARB_USRP_CNTRL_EN_ARB);
 523         if (ret)
 524                 goto unlock;
 525         ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
 526                            ADC_ARB_USRP_CNTRL_EN_ARB);
 527         if (ret)
 528                 goto unlock;
 529
 530
 531         /* Fire a request! */
 532         reinit_completion(&adc->complete);
 533         ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL,
 534                            ADC_ARB_USRP_CNTRL_EN_ARB |
 535                            ADC_ARB_USRP_CNTRL_REQ);
 536         if (ret)
 537                 goto unlock;
 538
 539         /* Next the interrupt occurs */
 540         ret = wait_for_completion_timeout(&adc->complete,
 541                                           VADC_CONV_TIME_MAX_US);
 542         if (!ret) {
 543                 dev_err(adc->dev, "conversion timed out\n");
 544                 ret = -ETIMEDOUT;
 545                 goto unlock;
 546         }
 547
 548         ret = regmap_read(adc->map, ADC_ARB_USRP_DATA0, &val);
 549         if (ret)
 550                 goto unlock;
 551         lsb = val;
 552         ret = regmap_read(adc->map, ADC_ARB_USRP_DATA1, &val);
 553         if (ret)
 554                 goto unlock;
 555         msb = val;
 556         *adc_code = (msb << 8) | lsb;
 557
 558         /* Turn off the ADC by setting the arbiter to 0 twice */
 559         ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);
 560         if (ret)
 561                 goto unlock;
 562         ret = regmap_write(adc->map, ADC_ARB_USRP_CNTRL, 0);
 563         if (ret)
 564                 goto unlock;
 565
 566 unlock:
 567         mutex_unlock(&adc->lock);
 568         return ret;
 569 }
 570
 571 static int pm8xxx_read_channel(struct pm8xxx_xoadc *adc,
 572                                const struct pm8xxx_chan_info *ch,
 573                                u16 *adc_code)
 574 {
 575         /*
 576          * Normally we just use the ratiometric scale value (RSV) predefined
 577          * for the channel, but during calibration we need to modify this
 578          * so this wrapper is a helper hiding the more complex version.
 579          */
 580         return pm8xxx_read_channel_rsv(adc, ch, 0xff, adc_code, false);
 581 }
 582
 583 static int pm8xxx_calibrate_device(struct pm8xxx_xoadc *adc)
 584 {
 585         const struct pm8xxx_chan_info *ch;
 586         u16 read_1250v;
 587         u16 read_0625v;
 588         u16 read_nomux_rsv5;
 589         u16 read_nomux_rsv4;
 590         int ret;
 591
 592         adc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
 593         adc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
 594
 595         /* Common reference channel calibration */
 596         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);
 597         if (!ch)
 598                 return -ENODEV;
 599         ret = pm8xxx_read_channel(adc, ch, &read_1250v);
 600         if (ret) {
 601                 dev_err(adc->dev, "could not read 1.25V reference channel\n");
 602                 return -ENODEV;
 603         }
 604         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);
 605         if (!ch)
 606                 return -ENODEV;
 607         ret = pm8xxx_read_channel(adc, ch, &read_0625v);
 608         if (ret) {
 609                 dev_err(adc->dev, "could not read 0.625V reference channel\n");
 610                 return -ENODEV;
 611         }
 612         if (read_1250v == read_0625v) {
 613                 dev_err(adc->dev, "read same ADC code for 1.25V and 0.625V\n");
 614                 return -ENODEV;
 615         }
 616
 617         adc->graph[VADC_CALIB_ABSOLUTE].dy = read_1250v - read_0625v;
 618         adc->graph[VADC_CALIB_ABSOLUTE].gnd = read_0625v;
 619
 620         dev_info(adc->dev, "absolute calibration dx = %d uV, dy = %d units\n",
 621                  VADC_ABSOLUTE_RANGE_UV, adc->graph[VADC_CALIB_ABSOLUTE].dy);
 622
 623         /* Ratiometric calibration */
 624         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);
 625         if (!ch)
 626                 return -ENODEV;
 627         ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV5,
 628                                       &read_nomux_rsv5, true);
 629         if (ret) {
 630                 dev_err(adc->dev, "could not read MUXOFF reference channel\n");
 631                 return -ENODEV;
 632         }
 633         ret = pm8xxx_read_channel_rsv(adc, ch, AMUX_RSV4,
 634                                       &read_nomux_rsv4, true);
 635         if (ret) {
 636                 dev_err(adc->dev, "could not read MUXOFF reference channel\n");
 637                 return -ENODEV;
 638         }
 639         adc->graph[VADC_CALIB_RATIOMETRIC].dy =
 640                 read_nomux_rsv5 - read_nomux_rsv4;
 641         adc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_nomux_rsv4;
 642
 643         dev_info(adc->dev, "ratiometric calibration dx = %d, dy = %d units\n",
 644                  VADC_RATIOMETRIC_RANGE,
 645                  adc->graph[VADC_CALIB_RATIOMETRIC].dy);
 646
 647         return 0;
 648 }
 649
 650 static int pm8xxx_read_raw(struct iio_dev *indio_dev,
 651                            struct iio_chan_spec const *chan,
 652                            int *val, int *val2, long mask)
 653 {
 654         struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
 655         const struct pm8xxx_chan_info *ch;
 656         u16 adc_code;
 657         int ret;
 658
 659         switch (mask) {
 660         case IIO_CHAN_INFO_PROCESSED:
 661                 ch = pm8xxx_get_channel(adc, chan->address);
 662                 if (!ch) {
 663                         dev_err(adc->dev, "no such channel %lu\n",
 664                                 chan->address);
 665                         return -EINVAL;
 666                 }
 667                 ret = pm8xxx_read_channel(adc, ch, &adc_code);
 668                 if (ret)
 669                         return ret;
 670
 671                 ret = qcom_vadc_scale(ch->hwchan->scale_fn_type,
 672                                       &adc->graph[ch->calibration],
 673                                       &ch->hwchan->prescale,
 674                                       (ch->calibration == VADC_CALIB_ABSOLUTE),
 675                                       adc_code, val);
 676                 if (ret)
 677                         return ret;
 678
 679                 return IIO_VAL_INT;
 680         case IIO_CHAN_INFO_RAW:
 681                 ch = pm8xxx_get_channel(adc, chan->address);
 682                 if (!ch) {
 683                         dev_err(adc->dev, "no such channel %lu\n",
 684                                 chan->address);
 685                         return -EINVAL;
 686                 }
 687                 ret = pm8xxx_read_channel(adc, ch, &adc_code);
 688                 if (ret)
 689                         return ret;
 690
 691                 *val = (int)adc_code;
 692                 return IIO_VAL_INT;
 693         default:
 694                 return -EINVAL;
 695         }
 696 }
 697
 698 static int pm8xxx_of_xlate(struct iio_dev *indio_dev,
 699                            const struct of_phandle_args *iiospec)
 700 {
 701         struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
 702         u8 pre_scale_mux;
 703         u8 amux_channel;
 704         unsigned int i;
 705
 706         /*
 707          * First cell is prescaler or premux, second cell is analog
 708          * mux.
 709          */
 710         if (iiospec->args_count != 2) {
 711                 dev_err(&indio_dev->dev, "wrong number of arguments for %s need 2 got %d\n",
 712                         iiospec->np->name,
 713                         iiospec->args_count);
 714                 return -EINVAL;
 715         }
 716         pre_scale_mux = (u8)iiospec->args[0];
 717         amux_channel = (u8)iiospec->args[1];
 718         dev_dbg(&indio_dev->dev, "pre scale/mux: %02x, amux: %02x\n",
 719                 pre_scale_mux, amux_channel);
 720
 721         /* We need to match exactly on the prescale/premux and channel */
 722         for (i = 0; i < adc->nchans; i++)
 723                 if (adc->chans[i].hwchan->pre_scale_mux == pre_scale_mux &&
 724                     adc->chans[i].hwchan->amux_channel == amux_channel)
 725                         return i;
 726
 727         return -EINVAL;
 728 }
 729
 730 static const struct iio_info pm8xxx_xoadc_info = {
 731         .driver_module = THIS_MODULE,
 732         .of_xlate = pm8xxx_of_xlate,
 733         .read_raw = pm8xxx_read_raw,
 734 };
 735
 736 static int pm8xxx_xoadc_parse_channel(struct device *dev,
 737                                       struct device_node *np,
 738                                       const struct xoadc_channel *hw_channels,
 739                                       struct iio_chan_spec *iio_chan,
 740                                       struct pm8xxx_chan_info *ch)
 741 {
 742         const char *name = np->name;
 743         const struct xoadc_channel *hwchan;
 744         u32 pre_scale_mux, amux_channel;
 745         u32 rsv, dec;
 746         int ret;
 747         int chid;
 748
 749         ret = of_property_read_u32_index(np, "reg", 0, &pre_scale_mux);
 750         if (ret) {
 751                 dev_err(dev, "invalid pre scale/mux number %s\n", name);
 752                 return ret;
 753         }
 754         ret = of_property_read_u32_index(np, "reg", 1, &amux_channel);
 755         if (ret) {
 756                 dev_err(dev, "invalid amux channel number %s\n", name);
 757                 return ret;
 758         }
 759
 760         /* Find the right channel setting */
 761         chid = 0;
 762         hwchan = &hw_channels[0];
 763         while (hwchan && hwchan->datasheet_name) {
 764                 if (hwchan->pre_scale_mux == pre_scale_mux &&
 765                     hwchan->amux_channel == amux_channel)
 766                         break;
 767                 hwchan++;
 768                 chid++;
 769         }
 770         /* The sentinel does not have a name assigned */
 771         if (!hwchan->datasheet_name) {
 772                 dev_err(dev, "could not locate channel %02x/%02x\n",
 773                         pre_scale_mux, amux_channel);
 774                 return -EINVAL;
 775         }
 776         ch->name = name;
 777         ch->hwchan = hwchan;
 778         /* Everyone seems to use absolute calibration except in special cases */
 779         ch->calibration = VADC_CALIB_ABSOLUTE;
 780         /* Everyone seems to use default ("type 2") decimation */
 781         ch->decimation = VADC_DEF_DECIMATION;
 782
 783         if (!of_property_read_u32(np, "qcom,ratiometric", &rsv)) {
 784                 ch->calibration = VADC_CALIB_RATIOMETRIC;
 785                 if (rsv > XOADC_RSV_MAX) {
 786                         dev_err(dev, "%s too large RSV value %d\n", name, rsv);
 787                         return -EINVAL;
 788                 }
 789                 if (rsv == AMUX_RSV3) {
 790                         dev_err(dev, "%s invalid RSV value %d\n", name, rsv);
 791                         return -EINVAL;
 792                 }
 793         }
 794
 795         /* Optional decimation, if omitted we use the default */
 796         ret = of_property_read_u32(np, "qcom,decimation", &dec);
 797         if (!ret) {
 798                 ret = qcom_vadc_decimation_from_dt(dec);
 799                 if (ret < 0) {
 800                         dev_err(dev, "%s invalid decimation %d\n",
 801                                 name, dec);
 802                         return ret;
 803                 }
 804                 ch->decimation = ret;
 805         }
 806
 807         iio_chan->channel = chid;
 808         iio_chan->address = hwchan->amux_channel;
 809         iio_chan->datasheet_name = hwchan->datasheet_name;
 810         iio_chan->type = hwchan->type;
 811         /* All channels are raw or processed */
 812         iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 813                 BIT(IIO_CHAN_INFO_PROCESSED);
 814         iio_chan->indexed = 1;
 815
 816         dev_dbg(dev, "channel [PRESCALE/MUX: %02x AMUX: %02x] \"%s\" "
 817                 "ref voltage: %d, decimation %d "
 818                 "prescale %d/%d, scale function %d\n",
 819                 hwchan->pre_scale_mux, hwchan->amux_channel, ch->name,
 820                 ch->amux_ip_rsv, ch->decimation, hwchan->prescale.num,
 821                 hwchan->prescale.den, hwchan->scale_fn_type);
 822
 823         return 0;
 824 }
 825
 826 static int pm8xxx_xoadc_parse_channels(struct pm8xxx_xoadc *adc,
 827                                        struct device_node *np)
 828 {
 829         struct device_node *child;
 830         struct pm8xxx_chan_info *ch;
 831         int ret;
 832         int i;
 833
 834         adc->nchans = of_get_available_child_count(np);
 835         if (!adc->nchans) {
 836                 dev_err(adc->dev, "no channel children\n");
 837                 return -ENODEV;
 838         }
 839         dev_dbg(adc->dev, "found %d ADC channels\n", adc->nchans);
 840
 841         adc->iio_chans = devm_kcalloc(adc->dev, adc->nchans,
 842                                       sizeof(*adc->iio_chans), GFP_KERNEL);
 843         if (!adc->iio_chans)
 844                 return -ENOMEM;
 845
 846         adc->chans = devm_kcalloc(adc->dev, adc->nchans,
 847                                   sizeof(*adc->chans), GFP_KERNEL);
 848         if (!adc->chans)
 849                 return -ENOMEM;
 850
 851         i = 0;
 852         for_each_available_child_of_node(np, child) {
 853                 ch = &adc->chans[i];
 854                 ret = pm8xxx_xoadc_parse_channel(adc->dev, child,
 855                                                  adc->variant->channels,
 856                                                  &adc->iio_chans[i],
 857                                                  ch);
 858                 if (ret) {
 859                         of_node_put(child);
 860                         return ret;
 861                 }
 862                 i++;
 863         }
 864
 865         /* Check for required channels */
 866         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_125V);
 867         if (!ch) {
 868                 dev_err(adc->dev, "missing 1.25V reference channel\n");
 869                 return -ENODEV;
 870         }
 871         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_INTERNAL);
 872         if (!ch) {
 873                 dev_err(adc->dev, "missing 0.625V reference channel\n");
 874                 return -ENODEV;
 875         }
 876         ch = pm8xxx_get_channel(adc, PM8XXX_CHANNEL_MUXOFF);
 877         if (!ch) {
 878                 dev_err(adc->dev, "missing MUXOFF reference channel\n");
 879                 return -ENODEV;
 880         }
 881
 882         return 0;
 883 }
 884
 885 static int pm8xxx_xoadc_probe(struct platform_device *pdev)
 886 {
 887         const struct xoadc_variant *variant;
 888         struct pm8xxx_xoadc *adc;
 889         struct iio_dev *indio_dev;
 890         struct device_node *np = pdev->dev.of_node;
 891         struct regmap *map;
 892         struct device *dev = &pdev->dev;
 893         int ret;
 894
 895         variant = of_device_get_match_data(dev);
 896         if (!variant)
 897                 return -ENODEV;
 898
 899         indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
 900         if (!indio_dev)
 901                 return -ENOMEM;
 902         platform_set_drvdata(pdev, indio_dev);
 903
 904         adc = iio_priv(indio_dev);
 905         adc->dev = dev;
 906         adc->variant = variant;
 907         init_completion(&adc->complete);
 908         mutex_init(&adc->lock);
 909
 910         ret = pm8xxx_xoadc_parse_channels(adc, np);
 911         if (ret)
 912                 return ret;
 913
 914         map = dev_get_regmap(dev->parent, NULL);
 915         if (!map) {
 916                 dev_err(dev, "parent regmap unavailable.\n");
 917                 return -ENXIO;
 918         }
 919         adc->map = map;
 920
 921         /* Bring up regulator */
 922         adc->vref = devm_regulator_get(dev, "xoadc-ref");
 923         if (IS_ERR(adc->vref)) {
 924                 dev_err(dev, "failed to get XOADC VREF regulator\n");
 925                 return PTR_ERR(adc->vref);
 926         }
 927         ret = regulator_enable(adc->vref);
 928         if (ret) {
 929                 dev_err(dev, "failed to enable XOADC VREF regulator\n");
 930                 return ret;
 931         }
 932
 933         ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0),
 934                         pm8xxx_eoc_irq, NULL, 0, variant->name, indio_dev);
 935         if (ret) {
 936                 dev_err(dev, "unable to request IRQ\n");
 937                 goto out_disable_vref;
 938         }
 939
 940         indio_dev->dev.parent = dev;
 941         indio_dev->dev.of_node = np;
 942         indio_dev->name = variant->name;
 943         indio_dev->modes = INDIO_DIRECT_MODE;
 944         indio_dev->info = &pm8xxx_xoadc_info;
 945         indio_dev->channels = adc->iio_chans;
 946         indio_dev->num_channels = adc->nchans;
 947
 948         ret = iio_device_register(indio_dev);
 949         if (ret)
 950                 goto out_disable_vref;
 951
 952         ret = pm8xxx_calibrate_device(adc);
 953         if (ret)
 954                 goto out_unreg_device;
 955
 956         dev_info(dev, "%s XOADC driver enabled\n", variant->name);
 957
 958         return 0;
 959
 960 out_unreg_device:
 961         iio_device_unregister(indio_dev);
 962 out_disable_vref:
 963         regulator_disable(adc->vref);
 964
 965         return ret;
 966 }
 967
 968 static int pm8xxx_xoadc_remove(struct platform_device *pdev)
 969 {
 970         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 971         struct pm8xxx_xoadc *adc = iio_priv(indio_dev);
 972
 973         iio_device_unregister(indio_dev);
 974
 975         regulator_disable(adc->vref);
 976
 977         return 0;
 978 }
 979
 980 static const struct xoadc_variant pm8018_variant = {
 981         .name = "PM8018-XOADC",
 982         .channels = pm8018_xoadc_channels,
 983 };
 984
 985 static const struct xoadc_variant pm8038_variant = {
 986         .name = "PM8038-XOADC",
 987         .channels = pm8038_xoadc_channels,
 988 };
 989
 990 static const struct xoadc_variant pm8058_variant = {
 991         .name = "PM8058-XOADC",
 992         .channels = pm8058_xoadc_channels,
 993         .broken_ratiometric = true,
 994         .prescaling = true,
 995 };
 996
 997 static const struct xoadc_variant pm8921_variant = {
 998         .name = "PM8921-XOADC",
 999         .channels = pm8921_xoadc_channels,
1000         .second_level_mux = true,
1001 };
1002
1003 static const struct of_device_id pm8xxx_xoadc_id_table[] = {
1004         {
1005                 .compatible = "qcom,pm8018-adc",
1006                 .data = &pm8018_variant,
1007         },
1008         {
1009                 .compatible = "qcom,pm8038-adc",
1010                 .data = &pm8038_variant,
1011         },
1012         {
1013                 .compatible = "qcom,pm8058-adc",
1014                 .data = &pm8058_variant,
1015         },
1016         {
1017                 .compatible = "qcom,pm8921-adc",
1018                 .data = &pm8921_variant,
1019         },
1020         { },
1021 };
1022 MODULE_DEVICE_TABLE(of, pm8xxx_xoadc_id_table);
1023
1024 static struct platform_driver pm8xxx_xoadc_driver = {
1025         .driver         = {
1026                 .name   = "pm8xxx-adc",
1027                 .of_match_table = pm8xxx_xoadc_id_table,
1028         },
1029         .probe          = pm8xxx_xoadc_probe,
1030         .remove         = pm8xxx_xoadc_remove,
1031 };
1032 module_platform_driver(pm8xxx_xoadc_driver);
1033
1034 MODULE_DESCRIPTION("PM8xxx XOADC driver");
1035 MODULE_LICENSE("GPL v2");
1036 MODULE_ALIAS("platform:pm8xxx-xoadc");