--- /dev/null
+/*
+ * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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/bitops.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/log2.h>
+
+#include <dt-bindings/iio/qcom,spmi-vadc.h>
+
+/* VADC register and bit definitions */
+#define VADC_REVISION2 0x1
+#define VADC_REVISION2_SUPPORTED_VADC 1
+
+#define VADC_PERPH_TYPE 0x4
+#define VADC_PERPH_TYPE_ADC 8
+
+#define VADC_PERPH_SUBTYPE 0x5
+#define VADC_PERPH_SUBTYPE_VADC 1
+
+#define VADC_STATUS1 0x8
+#define VADC_STATUS1_OP_MODE 4
+#define VADC_STATUS1_REQ_STS BIT(1)
+#define VADC_STATUS1_EOC BIT(0)
+#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3
+
+#define VADC_MODE_CTL 0x40
+#define VADC_OP_MODE_SHIFT 3
+#define VADC_OP_MODE_NORMAL 0
+#define VADC_AMUX_TRIM_EN BIT(1)
+#define VADC_ADC_TRIM_EN BIT(0)
+
+#define VADC_EN_CTL1 0x46
+#define VADC_EN_CTL1_SET BIT(7)
+
+#define VADC_ADC_CH_SEL_CTL 0x48
+
+#define VADC_ADC_DIG_PARAM 0x50
+#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2
+
+#define VADC_HW_SETTLE_DELAY 0x51
+
+#define VADC_CONV_REQ 0x52
+#define VADC_CONV_REQ_SET BIT(7)
+
+#define VADC_FAST_AVG_CTL 0x5a
+#define VADC_FAST_AVG_EN 0x5b
+#define VADC_FAST_AVG_EN_SET BIT(7)
+
+#define VADC_ACCESS 0xd0
+#define VADC_ACCESS_DATA 0xa5
+
+#define VADC_PERH_RESET_CTL3 0xda
+#define VADC_FOLLOW_WARM_RB BIT(2)
+
+#define VADC_DATA 0x60 /* 16 bits */
+
+#define VADC_CONV_TIME_MIN_US 2000
+#define VADC_CONV_TIME_MAX_US 2100
+
+/* Min ADC code represents 0V */
+#define VADC_MIN_ADC_CODE 0x6000
+/* Max ADC code represents full-scale range of 1.8V */
+#define VADC_MAX_ADC_CODE 0xa800
+
+#define VADC_ABSOLUTE_RANGE_UV 625000
+#define VADC_RATIOMETRIC_RANGE_UV 1800000
+
+#define VADC_DEF_PRESCALING 0 /* 1:1 */
+#define VADC_DEF_DECIMATION 0 /* 512 */
+#define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */
+#define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */
+#define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE
+
+#define VADC_DECIMATION_MIN 512
+#define VADC_DECIMATION_MAX 4096
+
+#define VADC_HW_SETTLE_DELAY_MAX 10000
+#define VADC_AVG_SAMPLES_MAX 512
+
+#define KELVINMIL_CELSIUSMIL 273150
+
+#define VADC_CHAN_MIN VADC_USBIN
+#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
+
+/*
+ * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.
+ * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for
+ * calibration.
+ */
+enum vadc_calibration {
+ VADC_CALIB_ABSOLUTE = 0,
+ VADC_CALIB_RATIOMETRIC
+};
+
+/**
+ * struct vadc_linear_graph - Represent ADC characteristics.
+ * @dy: numerator slope to calculate the gain.
+ * @dx: denominator slope to calculate the gain.
+ * @gnd: A/D word of the ground reference used for the channel.
+ *
+ * Each ADC device has different offset and gain parameters which are
+ * computed to calibrate the device.
+ */
+struct vadc_linear_graph {
+ s32 dy;
+ s32 dx;
+ s32 gnd;
+};
+
+/**
+ * struct vadc_prescale_ratio - Represent scaling ratio for ADC input.
+ * @num: the inverse numerator of the gain applied to the input channel.
+ * @den: the inverse denominator of the gain applied to the input channel.
+ */
+struct vadc_prescale_ratio {
+ u32 num;
+ u32 den;
+};
+
+/**
+ * struct vadc_channel_prop - VADC channel property.
+ * @channel: channel number, refer to the channel list.
+ * @calibration: calibration type.
+ * @decimation: sampling rate supported for the channel.
+ * @prescale: channel scaling performed on the input signal.
+ * @hw_settle_time: the time between AMUX being configured and the
+ * start of conversion.
+ * @avg_samples: ability to provide single result from the ADC
+ * that is an average of multiple measurements.
+ */
+struct vadc_channel_prop {
+ unsigned int channel;
+ enum vadc_calibration calibration;
+ unsigned int decimation;
+ unsigned int prescale;
+ unsigned int hw_settle_time;
+ unsigned int avg_samples;
+};
+
+/**
+ * struct vadc_priv - VADC private structure.
+ * @regmap: pointer to struct regmap.
+ * @dev: pointer to struct device.
+ * @base: base address for the ADC peripheral.
+ * @nchannels: number of VADC channels.
+ * @chan_props: array of VADC channel properties.
+ * @iio_chans: array of IIO channels specification.
+ * @are_ref_measured: are reference points measured.
+ * @poll_eoc: use polling instead of interrupt.
+ * @complete: VADC result notification after interrupt is received.
+ * @graph: store parameters for calibration.
+ * @lock: ADC lock for access to the peripheral.
+ */
+struct vadc_priv {
+ struct regmap *regmap;
+ struct device *dev;
+ u16 base;
+ unsigned int nchannels;
+ struct vadc_channel_prop *chan_props;
+ struct iio_chan_spec *iio_chans;
+ bool are_ref_measured;
+ bool poll_eoc;
+ struct completion complete;
+ struct vadc_linear_graph graph[2];
+ struct mutex lock;
+};
+
+static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
+ {.num = 1, .den = 1},
+ {.num = 1, .den = 3},
+ {.num = 1, .den = 4},
+ {.num = 1, .den = 6},
+ {.num = 1, .den = 20},
+ {.num = 1, .den = 8},
+ {.num = 10, .den = 81},
+ {.num = 1, .den = 10}
+};
+
+static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
+{
+ return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
+}
+
+static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data)
+{
+ return regmap_write(vadc->regmap, vadc->base + offset, data);
+}
+
+static int vadc_reset(struct vadc_priv *vadc)
+{
+ u8 data;
+ int ret;
+
+ ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
+ if (ret)
+ return ret;
+
+ ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data);
+ if (ret)
+ return ret;
+
+ ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA);
+ if (ret)
+ return ret;
+
+ data |= VADC_FOLLOW_WARM_RB;
+
+ return vadc_write(vadc, VADC_PERH_RESET_CTL3, data);
+}
+
+static int vadc_set_state(struct vadc_priv *vadc, bool state)
+{
+ return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0);
+}
+
+static void vadc_show_status(struct vadc_priv *vadc)
+{
+ u8 mode, sta1, chan, dig, en, req;
+ int ret;
+
+ ret = vadc_read(vadc, VADC_MODE_CTL, &mode);
+ if (ret)
+ return;
+
+ ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig);
+ if (ret)
+ return;
+
+ ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan);
+ if (ret)
+ return;
+
+ ret = vadc_read(vadc, VADC_CONV_REQ, &req);
+ if (ret)
+ return;
+
+ ret = vadc_read(vadc, VADC_STATUS1, &sta1);
+ if (ret)
+ return;
+
+ ret = vadc_read(vadc, VADC_EN_CTL1, &en);
+ if (ret)
+ return;
+
+ dev_err(vadc->dev,
+ "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n",
+ mode, en, chan, dig, req, sta1);
+}
+
+static int vadc_configure(struct vadc_priv *vadc,
+ struct vadc_channel_prop *prop)
+{
+ u8 decimation, mode_ctrl;
+ int ret;
+
+ /* Mode selection */
+ mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) |
+ VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN;
+ ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl);
+ if (ret)
+ return ret;
+
+ /* Channel selection */
+ ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel);
+ if (ret)
+ return ret;
+
+ /* Digital parameter setup */
+ decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT;
+ ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation);
+ if (ret)
+ return ret;
+
+ /* HW settle time delay */
+ ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time);
+ if (ret)
+ return ret;
+
+ ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples);
+ if (ret)
+ return ret;
+
+ if (prop->avg_samples)
+ ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET);
+ else
+ ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0);
+
+ return ret;
+}
+
+static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us)
+{
+ unsigned int count, retry;
+ u8 sta1;
+ int ret;
+
+ retry = interval_us / VADC_CONV_TIME_MIN_US;
+
+ for (count = 0; count < retry; count++) {
+ ret = vadc_read(vadc, VADC_STATUS1, &sta1);
+ if (ret)
+ return ret;
+
+ sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK;
+ if (sta1 == VADC_STATUS1_EOC)
+ return 0;
+
+ usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US);
+ }
+
+ vadc_show_status(vadc);
+
+ return -ETIMEDOUT;
+}
+
+static int vadc_read_result(struct vadc_priv *vadc, u16 *data)
+{
+ int ret;
+
+ ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2);
+ if (ret)
+ return ret;
+
+ *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE);
+
+ return 0;
+}
+
+static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc,
+ unsigned int num)
+{
+ unsigned int i;
+
+ for (i = 0; i < vadc->nchannels; i++)
+ if (vadc->chan_props[i].channel == num)
+ return &vadc->chan_props[i];
+
+ dev_dbg(vadc->dev, "no such channel %02x\n", num);
+
+ return NULL;
+}
+
+static int vadc_do_conversion(struct vadc_priv *vadc,
+ struct vadc_channel_prop *prop, u16 *data)
+{
+ unsigned int timeout;
+ int ret;
+
+ mutex_lock(&vadc->lock);
+
+ ret = vadc_configure(vadc, prop);
+ if (ret)
+ goto unlock;
+
+ if (!vadc->poll_eoc)
+ reinit_completion(&vadc->complete);
+
+ ret = vadc_set_state(vadc, true);
+ if (ret)
+ goto unlock;
+
+ ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET);
+ if (ret)
+ goto err_disable;
+
+ timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2;
+
+ if (vadc->poll_eoc) {
+ ret = vadc_poll_wait_eoc(vadc, timeout);
+ } else {
+ ret = wait_for_completion_timeout(&vadc->complete, timeout);
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ goto err_disable;
+ }
+
+ /* Double check conversion status */
+ ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US);
+ if (ret)
+ goto err_disable;
+ }
+
+ ret = vadc_read_result(vadc, data);
+
+err_disable:
+ vadc_set_state(vadc, false);
+ if (ret)
+ dev_err(vadc->dev, "conversion failed\n");
+unlock:
+ mutex_unlock(&vadc->lock);
+ return ret;
+}
+
+static int vadc_measure_ref_points(struct vadc_priv *vadc)
+{
+ struct vadc_channel_prop *prop;
+ u16 read_1, read_2;
+ int ret;
+
+ vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE_UV;
+ vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
+
+ prop = vadc_get_channel(vadc, VADC_REF_1250MV);
+ ret = vadc_do_conversion(vadc, prop, &read_1);
+ if (ret)
+ goto err;
+
+ /* Try with buffered 625mV channel first */
+ prop = vadc_get_channel(vadc, VADC_SPARE1);
+ if (!prop)
+ prop = vadc_get_channel(vadc, VADC_REF_625MV);
+
+ ret = vadc_do_conversion(vadc, prop, &read_2);
+ if (ret)
+ goto err;
+
+ if (read_1 == read_2) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2;
+ vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2;
+
+ /* Ratiometric calibration */
+ prop = vadc_get_channel(vadc, VADC_VDD_VADC);
+ ret = vadc_do_conversion(vadc, prop, &read_1);
+ if (ret)
+ goto err;
+
+ prop = vadc_get_channel(vadc, VADC_GND_REF);
+ ret = vadc_do_conversion(vadc, prop, &read_2);
+ if (ret)
+ goto err;
+
+ if (read_1 == read_2) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2;
+ vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2;
+err:
+ if (ret)
+ dev_err(vadc->dev, "measure reference points failed\n");
+
+ return ret;
+}
+
+static s32 vadc_calibrate(struct vadc_priv *vadc,
+ const struct vadc_channel_prop *prop, u16 adc_code)
+{
+ const struct vadc_prescale_ratio *prescale;
+ s64 voltage;
+
+ voltage = adc_code - vadc->graph[prop->calibration].gnd;
+ voltage *= vadc->graph[prop->calibration].dx;
+ voltage = div64_s64(voltage, vadc->graph[prop->calibration].dy);
+
+ if (prop->calibration == VADC_CALIB_ABSOLUTE)
+ voltage += vadc->graph[prop->calibration].dx;
+
+ if (voltage < 0)
+ voltage = 0;
+
+ prescale = &vadc_prescale_ratios[prop->prescale];
+
+ voltage = voltage * prescale->den;
+
+ return div64_s64(voltage, prescale->num);
+}
+
+static int vadc_decimation_from_dt(u32 value)
+{
+ if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
+ value > VADC_DECIMATION_MAX)
+ return -EINVAL;
+
+ return __ffs64(value / VADC_DECIMATION_MIN);
+}
+
+static int vadc_prescaling_from_dt(u32 num, u32 den)
+{
+ unsigned int pre;
+
+ for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++)
+ if (vadc_prescale_ratios[pre].num == num &&
+ vadc_prescale_ratios[pre].den == den)
+ break;
+
+ if (pre == ARRAY_SIZE(vadc_prescale_ratios))
+ return -EINVAL;
+
+ return pre;
+}
+
+static int vadc_hw_settle_time_from_dt(u32 value)
+{
+ if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000))
+ return -EINVAL;
+
+ if (value <= 1000)
+ value /= 100;
+ else
+ value = value / 2000 + 10;
+
+ return value;
+}
+
+static int vadc_avg_samples_from_dt(u32 value)
+{
+ if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX)
+ return -EINVAL;
+
+ return __ffs64(value);
+}
+
+static int vadc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val, int *val2,
+ long mask)
+{
+ struct vadc_priv *vadc = iio_priv(indio_dev);
+ struct vadc_channel_prop *prop;
+ u16 adc_code;
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ prop = &vadc->chan_props[chan->address];
+ ret = vadc_do_conversion(vadc, prop, &adc_code);
+ if (ret)
+ break;
+
+ *val = vadc_calibrate(vadc, prop, adc_code);
+
+ /* 2mV/K, return milli Celsius */
+ *val /= 2;
+ *val -= KELVINMIL_CELSIUSMIL;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_RAW:
+ prop = &vadc->chan_props[chan->address];
+ ret = vadc_do_conversion(vadc, prop, &adc_code);
+ if (ret)
+ break;
+
+ *val = vadc_calibrate(vadc, prop, adc_code);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ *val2 = 1000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int vadc_of_xlate(struct iio_dev *indio_dev,
+ const struct of_phandle_args *iiospec)
+{
+ struct vadc_priv *vadc = iio_priv(indio_dev);
+ unsigned int i;
+
+ for (i = 0; i < vadc->nchannels; i++)
+ if (vadc->iio_chans[i].channel == iiospec->args[0])
+ return i;
+
+ return -EINVAL;
+}
+
+static const struct iio_info vadc_info = {
+ .read_raw = vadc_read_raw,
+ .of_xlate = vadc_of_xlate,
+ .driver_module = THIS_MODULE,
+};
+
+struct vadc_channels {
+ const char *datasheet_name;
+ unsigned int prescale_index;
+ enum iio_chan_type type;
+ long info_mask;
+};
+
+#define VADC_CHAN(_dname, _type, _mask, _pre) \
+ [VADC_##_dname] = { \
+ .datasheet_name = __stringify(_dname), \
+ .prescale_index = _pre, \
+ .type = _type, \
+ .info_mask = _mask \
+ }, \
+
+#define VADC_CHAN_TEMP(_dname, _pre) \
+ VADC_CHAN(_dname, IIO_TEMP, BIT(IIO_CHAN_INFO_PROCESSED), _pre) \
+
+#define VADC_CHAN_VOLT(_dname, _pre) \
+ VADC_CHAN(_dname, IIO_VOLTAGE, \
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
+ _pre) \
+
+/*
+ * The array represents all possible ADC channels found in the supported PMICs.
+ * Every index in the array is equal to the channel number per datasheet. The
+ * gaps in the array should be treated as reserved channels.
+ */
+static const struct vadc_channels vadc_chans[] = {
+ VADC_CHAN_VOLT(USBIN, 4)
+ VADC_CHAN_VOLT(DCIN, 4)
+ VADC_CHAN_VOLT(VCHG_SNS, 3)
+ VADC_CHAN_VOLT(SPARE1_03, 1)
+ VADC_CHAN_VOLT(USB_ID_MV, 1)
+ VADC_CHAN_VOLT(VCOIN, 1)
+ VADC_CHAN_VOLT(VBAT_SNS, 1)
+ VADC_CHAN_VOLT(VSYS, 1)
+ VADC_CHAN_TEMP(DIE_TEMP, 0)
+ VADC_CHAN_VOLT(REF_625MV, 0)
+ VADC_CHAN_VOLT(REF_1250MV, 0)
+ VADC_CHAN_VOLT(CHG_TEMP, 0)
+ VADC_CHAN_VOLT(SPARE1, 0)
+ VADC_CHAN_VOLT(SPARE2, 0)
+ VADC_CHAN_VOLT(GND_REF, 0)
+ VADC_CHAN_VOLT(VDD_VADC, 0)
+
+ VADC_CHAN_VOLT(P_MUX1_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX2_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX3_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX4_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX5_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX6_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX7_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX8_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX9_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX10_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX11_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX12_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX13_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX14_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX15_1_1, 0)
+ VADC_CHAN_VOLT(P_MUX16_1_1, 0)
+
+ VADC_CHAN_VOLT(P_MUX1_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX2_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX3_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX4_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX5_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX6_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX7_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX8_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX9_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX10_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX11_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX12_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX13_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX14_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX15_1_3, 1)
+ VADC_CHAN_VOLT(P_MUX16_1_3, 1)
+
+ VADC_CHAN_VOLT(LR_MUX1_BAT_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_XO_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX4_AMUX_THM1, 0)
+ VADC_CHAN_VOLT(LR_MUX5_AMUX_THM2, 0)
+ VADC_CHAN_VOLT(LR_MUX6_AMUX_THM3, 0)
+ VADC_CHAN_VOLT(LR_MUX7_HW_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX8_AMUX_THM4, 0)
+ VADC_CHAN_VOLT(LR_MUX9_AMUX_THM5, 0)
+ VADC_CHAN_VOLT(LR_MUX10_USB_ID, 0)
+ VADC_CHAN_VOLT(AMUX_PU1, 0)
+ VADC_CHAN_VOLT(AMUX_PU2, 0)
+ VADC_CHAN_VOLT(LR_MUX3_BUF_XO_THERM, 0)
+
+ VADC_CHAN_VOLT(LR_MUX1_PU1_BAT_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX2_PU1_BAT_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_PU1_XO_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX4_PU1_AMUX_THM1, 0)
+ VADC_CHAN_VOLT(LR_MUX5_PU1_AMUX_THM2, 0)
+ VADC_CHAN_VOLT(LR_MUX6_PU1_AMUX_THM3, 0)
+ VADC_CHAN_VOLT(LR_MUX7_PU1_AMUX_HW_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX8_PU1_AMUX_THM4, 0)
+ VADC_CHAN_VOLT(LR_MUX9_PU1_AMUX_THM5, 0)
+ VADC_CHAN_VOLT(LR_MUX10_PU1_AMUX_USB_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_XO_THERM, 0)
+
+ VADC_CHAN_VOLT(LR_MUX1_PU2_BAT_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX2_PU2_BAT_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_PU2_XO_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX4_PU2_AMUX_THM1, 0)
+ VADC_CHAN_VOLT(LR_MUX5_PU2_AMUX_THM2, 0)
+ VADC_CHAN_VOLT(LR_MUX6_PU2_AMUX_THM3, 0)
+ VADC_CHAN_VOLT(LR_MUX7_PU2_AMUX_HW_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX8_PU2_AMUX_THM4, 0)
+ VADC_CHAN_VOLT(LR_MUX9_PU2_AMUX_THM5, 0)
+ VADC_CHAN_VOLT(LR_MUX10_PU2_AMUX_USB_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_BUF_PU2_XO_THERM, 0)
+
+ VADC_CHAN_VOLT(LR_MUX1_PU1_PU2_BAT_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX2_PU1_PU2_BAT_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_PU1_PU2_XO_THERM, 0)
+ VADC_CHAN_VOLT(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
+ VADC_CHAN_VOLT(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
+ VADC_CHAN_VOLT(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
+ VADC_CHAN_VOLT(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
+ VADC_CHAN_VOLT(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
+ VADC_CHAN_VOLT(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
+ VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
+};
+
+static int vadc_get_dt_channel_data(struct device *dev,
+ struct vadc_channel_prop *prop,
+ struct device_node *node)
+{
+ const char *name = node->name;
+ u32 chan, value, varr[2];
+ int ret;
+
+ ret = of_property_read_u32(node, "reg", &chan);
+ if (ret) {
+ dev_err(dev, "invalid channel number %s\n", name);
+ return ret;
+ }
+
+ if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) {
+ dev_err(dev, "%s invalid channel number %d\n", name, chan);
+ return -EINVAL;
+ }
+
+ /* the channel has DT description */
+ prop->channel = chan;
+
+ ret = of_property_read_u32(node, "qcom,decimation", &value);
+ if (!ret) {
+ ret = vadc_decimation_from_dt(value);
+ if (ret < 0) {
+ dev_err(dev, "%02x invalid decimation %d\n",
+ chan, value);
+ return ret;
+ }
+ prop->decimation = ret;
+ } else {
+ prop->decimation = VADC_DEF_DECIMATION;
+ }
+
+ ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2);
+ if (!ret) {
+ ret = vadc_prescaling_from_dt(varr[0], varr[1]);
+ if (ret < 0) {
+ dev_err(dev, "%02x invalid pre-scaling <%d %d>\n",
+ chan, varr[0], varr[1]);
+ return ret;
+ }
+ prop->prescale = ret;
+ } else {
+ prop->prescale = vadc_chans[prop->channel].prescale_index;
+ }
+
+ ret = of_property_read_u32(node, "qcom,hw-settle-time", &value);
+ if (!ret) {
+ ret = vadc_hw_settle_time_from_dt(value);
+ if (ret < 0) {
+ dev_err(dev, "%02x invalid hw-settle-time %d us\n",
+ chan, value);
+ return ret;
+ }
+ prop->hw_settle_time = ret;
+ } else {
+ prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME;
+ }
+
+ ret = of_property_read_u32(node, "qcom,avg-samples", &value);
+ if (!ret) {
+ ret = vadc_avg_samples_from_dt(value);
+ if (ret < 0) {
+ dev_err(dev, "%02x invalid avg-samples %d\n",
+ chan, value);
+ return ret;
+ }
+ prop->avg_samples = ret;
+ } else {
+ prop->avg_samples = VADC_DEF_AVG_SAMPLES;
+ }
+
+ if (of_property_read_bool(node, "qcom,ratiometric"))
+ prop->calibration = VADC_CALIB_RATIOMETRIC;
+ else
+ prop->calibration = VADC_CALIB_ABSOLUTE;
+
+ dev_dbg(dev, "%02x name %s\n", chan, name);
+
+ return 0;
+}
+
+static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
+{
+ const struct vadc_channels *vadc_chan;
+ struct iio_chan_spec *iio_chan;
+ struct vadc_channel_prop prop;
+ struct device_node *child;
+ unsigned int index = 0;
+ int ret;
+
+ vadc->nchannels = of_get_available_child_count(node);
+ if (!vadc->nchannels)
+ return -EINVAL;
+
+ vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels,
+ sizeof(*vadc->iio_chans), GFP_KERNEL);
+ if (!vadc->iio_chans)
+ return -ENOMEM;
+
+ vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels,
+ sizeof(*vadc->chan_props), GFP_KERNEL);
+ if (!vadc->chan_props)
+ return -ENOMEM;
+
+ iio_chan = vadc->iio_chans;
+
+ for_each_available_child_of_node(node, child) {
+ ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
+ if (ret)
+ return ret;
+
+ vadc->chan_props[index] = prop;
+
+ vadc_chan = &vadc_chans[prop.channel];
+
+ iio_chan->channel = prop.channel;
+ iio_chan->datasheet_name = vadc_chan->datasheet_name;
+ iio_chan->info_mask_separate = vadc_chan->info_mask;
+ iio_chan->type = vadc_chan->type;
+ iio_chan->indexed = 1;
+ iio_chan->address = index++;
+
+ iio_chan++;
+ }
+
+ /* These channels are mandatory, they are used as reference points */
+ if (!vadc_get_channel(vadc, VADC_REF_1250MV)) {
+ dev_err(vadc->dev, "Please define 1.25V channel\n");
+ return -ENODEV;
+ }
+
+ if (!vadc_get_channel(vadc, VADC_REF_625MV)) {
+ dev_err(vadc->dev, "Please define 0.625V channel\n");
+ return -ENODEV;
+ }
+
+ if (!vadc_get_channel(vadc, VADC_VDD_VADC)) {
+ dev_err(vadc->dev, "Please define VDD channel\n");
+ return -ENODEV;
+ }
+
+ if (!vadc_get_channel(vadc, VADC_GND_REF)) {
+ dev_err(vadc->dev, "Please define GND channel\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static irqreturn_t vadc_isr(int irq, void *dev_id)
+{
+ struct vadc_priv *vadc = dev_id;
+
+ complete(&vadc->complete);
+
+ return IRQ_HANDLED;
+}
+
+static int vadc_check_revision(struct vadc_priv *vadc)
+{
+ u8 val;
+ int ret;
+
+ ret = vadc_read(vadc, VADC_PERPH_TYPE, &val);
+ if (ret)
+ return ret;
+
+ if (val < VADC_PERPH_TYPE_ADC) {
+ dev_err(vadc->dev, "%d is not ADC\n", val);
+ return -ENODEV;
+ }
+
+ ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val);
+ if (ret)
+ return ret;
+
+ if (val < VADC_PERPH_SUBTYPE_VADC) {
+ dev_err(vadc->dev, "%d is not VADC\n", val);
+ return -ENODEV;
+ }
+
+ ret = vadc_read(vadc, VADC_REVISION2, &val);
+ if (ret)
+ return ret;
+
+ if (val < VADC_REVISION2_SUPPORTED_VADC) {
+ dev_err(vadc->dev, "revision %d not supported\n", val);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int vadc_probe(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct iio_dev *indio_dev;
+ struct vadc_priv *vadc;
+ struct regmap *regmap;
+ int ret, irq_eoc;
+ u32 reg;
+
+ regmap = dev_get_regmap(dev->parent, NULL);
+ if (!regmap)
+ return -ENODEV;
+
+ ret = of_property_read_u32(node, "reg", ®);
+ if (ret < 0)
+ return ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ vadc = iio_priv(indio_dev);
+ vadc->regmap = regmap;
+ vadc->dev = dev;
+ vadc->base = reg;
+ vadc->are_ref_measured = false;
+ init_completion(&vadc->complete);
+ mutex_init(&vadc->lock);
+
+ ret = vadc_check_revision(vadc);
+ if (ret)
+ return ret;
+
+ ret = vadc_get_dt_data(vadc, node);
+ if (ret)
+ return ret;
+
+ irq_eoc = platform_get_irq(pdev, 0);
+ if (irq_eoc < 0) {
+ if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL)
+ return irq_eoc;
+ vadc->poll_eoc = true;
+ } else {
+ ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0,
+ "spmi-vadc", vadc);
+ if (ret)
+ return ret;
+ }
+
+ ret = vadc_reset(vadc);
+ if (ret) {
+ dev_err(dev, "reset failed\n");
+ return ret;
+ }
+
+ ret = vadc_measure_ref_points(vadc);
+ if (ret)
+ return ret;
+
+ indio_dev->dev.parent = dev;
+ indio_dev->dev.of_node = node;
+ indio_dev->name = pdev->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &vadc_info;
+ indio_dev->channels = vadc->iio_chans;
+ indio_dev->num_channels = vadc->nchannels;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct of_device_id vadc_match_table[] = {
+ { .compatible = "qcom,spmi-vadc" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, vadc_match_table);
+
+static struct platform_driver vadc_driver = {
+ .driver = {
+ .name = "qcom-spmi-vadc",
+ .of_match_table = vadc_match_table,
+ },
+ .probe = vadc_probe,
+};
+module_platform_driver(vadc_driver);
+
+MODULE_ALIAS("platform:qcom-spmi-vadc");
+MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
+MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
Code Review / kvmfornfv.git / blobdiff