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937 lines
23 KiB
937 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/completion.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/iio/adc/qcom-vadc-common.h> |
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#include <linux/iio/iio.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/math64.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/log2.h> |
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#include <dt-bindings/iio/qcom,spmi-vadc.h> |
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/* VADC register and bit definitions */ |
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#define VADC_REVISION2 0x1 |
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#define VADC_REVISION2_SUPPORTED_VADC 1 |
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#define VADC_PERPH_TYPE 0x4 |
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#define VADC_PERPH_TYPE_ADC 8 |
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#define VADC_PERPH_SUBTYPE 0x5 |
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#define VADC_PERPH_SUBTYPE_VADC 1 |
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#define VADC_STATUS1 0x8 |
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#define VADC_STATUS1_OP_MODE 4 |
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#define VADC_STATUS1_REQ_STS BIT(1) |
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#define VADC_STATUS1_EOC BIT(0) |
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#define VADC_STATUS1_REQ_STS_EOC_MASK 0x3 |
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#define VADC_MODE_CTL 0x40 |
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#define VADC_OP_MODE_SHIFT 3 |
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#define VADC_OP_MODE_NORMAL 0 |
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#define VADC_AMUX_TRIM_EN BIT(1) |
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#define VADC_ADC_TRIM_EN BIT(0) |
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#define VADC_EN_CTL1 0x46 |
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#define VADC_EN_CTL1_SET BIT(7) |
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#define VADC_ADC_CH_SEL_CTL 0x48 |
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#define VADC_ADC_DIG_PARAM 0x50 |
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#define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2 |
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#define VADC_HW_SETTLE_DELAY 0x51 |
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#define VADC_CONV_REQ 0x52 |
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#define VADC_CONV_REQ_SET BIT(7) |
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#define VADC_FAST_AVG_CTL 0x5a |
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#define VADC_FAST_AVG_EN 0x5b |
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#define VADC_FAST_AVG_EN_SET BIT(7) |
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#define VADC_ACCESS 0xd0 |
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#define VADC_ACCESS_DATA 0xa5 |
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#define VADC_PERH_RESET_CTL3 0xda |
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#define VADC_FOLLOW_WARM_RB BIT(2) |
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#define VADC_DATA 0x60 /* 16 bits */ |
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#define VADC_CHAN_MIN VADC_USBIN |
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#define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM |
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/** |
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* struct vadc_channel_prop - VADC channel property. |
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* @channel: channel number, refer to the channel list. |
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* @calibration: calibration type. |
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* @decimation: sampling rate supported for the channel. |
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* @prescale: channel scaling performed on the input signal. |
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* @hw_settle_time: the time between AMUX being configured and the |
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* start of conversion. |
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* @avg_samples: ability to provide single result from the ADC |
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* that is an average of multiple measurements. |
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* @scale_fn_type: Represents the scaling function to convert voltage |
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* physical units desired by the client for the channel. |
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*/ |
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struct vadc_channel_prop { |
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unsigned int channel; |
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enum vadc_calibration calibration; |
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unsigned int decimation; |
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unsigned int prescale; |
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unsigned int hw_settle_time; |
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unsigned int avg_samples; |
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enum vadc_scale_fn_type scale_fn_type; |
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}; |
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/** |
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* struct vadc_priv - VADC private structure. |
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* @regmap: pointer to struct regmap. |
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* @dev: pointer to struct device. |
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* @base: base address for the ADC peripheral. |
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* @nchannels: number of VADC channels. |
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* @chan_props: array of VADC channel properties. |
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* @iio_chans: array of IIO channels specification. |
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* @are_ref_measured: are reference points measured. |
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* @poll_eoc: use polling instead of interrupt. |
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* @complete: VADC result notification after interrupt is received. |
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* @graph: store parameters for calibration. |
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* @lock: ADC lock for access to the peripheral. |
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*/ |
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struct vadc_priv { |
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struct regmap *regmap; |
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struct device *dev; |
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u16 base; |
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unsigned int nchannels; |
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struct vadc_channel_prop *chan_props; |
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struct iio_chan_spec *iio_chans; |
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bool are_ref_measured; |
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bool poll_eoc; |
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struct completion complete; |
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struct vadc_linear_graph graph[2]; |
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struct mutex lock; |
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}; |
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static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { |
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{.num = 1, .den = 1}, |
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{.num = 1, .den = 3}, |
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{.num = 1, .den = 4}, |
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{.num = 1, .den = 6}, |
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{.num = 1, .den = 20}, |
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{.num = 1, .den = 8}, |
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{.num = 10, .den = 81}, |
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{.num = 1, .den = 10} |
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}; |
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static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data) |
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{ |
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return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1); |
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} |
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static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data) |
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{ |
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return regmap_write(vadc->regmap, vadc->base + offset, data); |
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} |
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static int vadc_reset(struct vadc_priv *vadc) |
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{ |
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u8 data; |
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int ret; |
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ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); |
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if (ret) |
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return ret; |
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ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data); |
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if (ret) |
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return ret; |
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ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); |
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if (ret) |
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return ret; |
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data |= VADC_FOLLOW_WARM_RB; |
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return vadc_write(vadc, VADC_PERH_RESET_CTL3, data); |
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} |
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static int vadc_set_state(struct vadc_priv *vadc, bool state) |
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{ |
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return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0); |
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} |
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static void vadc_show_status(struct vadc_priv *vadc) |
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{ |
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u8 mode, sta1, chan, dig, en, req; |
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int ret; |
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ret = vadc_read(vadc, VADC_MODE_CTL, &mode); |
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if (ret) |
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return; |
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ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig); |
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if (ret) |
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return; |
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ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan); |
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if (ret) |
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return; |
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ret = vadc_read(vadc, VADC_CONV_REQ, &req); |
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if (ret) |
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return; |
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ret = vadc_read(vadc, VADC_STATUS1, &sta1); |
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if (ret) |
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return; |
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ret = vadc_read(vadc, VADC_EN_CTL1, &en); |
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if (ret) |
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return; |
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dev_err(vadc->dev, |
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"mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n", |
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mode, en, chan, dig, req, sta1); |
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} |
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static int vadc_configure(struct vadc_priv *vadc, |
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struct vadc_channel_prop *prop) |
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{ |
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u8 decimation, mode_ctrl; |
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int ret; |
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/* Mode selection */ |
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mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) | |
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VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN; |
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ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl); |
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if (ret) |
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return ret; |
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/* Channel selection */ |
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ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel); |
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if (ret) |
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return ret; |
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/* Digital parameter setup */ |
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decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT; |
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ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation); |
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if (ret) |
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return ret; |
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/* HW settle time delay */ |
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ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time); |
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if (ret) |
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return ret; |
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ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples); |
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if (ret) |
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return ret; |
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if (prop->avg_samples) |
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ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET); |
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else |
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ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0); |
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return ret; |
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} |
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static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us) |
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{ |
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unsigned int count, retry; |
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u8 sta1; |
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int ret; |
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retry = interval_us / VADC_CONV_TIME_MIN_US; |
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for (count = 0; count < retry; count++) { |
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ret = vadc_read(vadc, VADC_STATUS1, &sta1); |
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if (ret) |
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return ret; |
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sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK; |
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if (sta1 == VADC_STATUS1_EOC) |
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return 0; |
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usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US); |
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} |
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vadc_show_status(vadc); |
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return -ETIMEDOUT; |
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} |
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static int vadc_read_result(struct vadc_priv *vadc, u16 *data) |
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{ |
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int ret; |
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ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2); |
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if (ret) |
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return ret; |
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*data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE); |
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return 0; |
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} |
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static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc, |
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unsigned int num) |
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{ |
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unsigned int i; |
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for (i = 0; i < vadc->nchannels; i++) |
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if (vadc->chan_props[i].channel == num) |
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return &vadc->chan_props[i]; |
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dev_dbg(vadc->dev, "no such channel %02x\n", num); |
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return NULL; |
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} |
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static int vadc_do_conversion(struct vadc_priv *vadc, |
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struct vadc_channel_prop *prop, u16 *data) |
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{ |
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unsigned int timeout; |
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int ret; |
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mutex_lock(&vadc->lock); |
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ret = vadc_configure(vadc, prop); |
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if (ret) |
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goto unlock; |
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if (!vadc->poll_eoc) |
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reinit_completion(&vadc->complete); |
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ret = vadc_set_state(vadc, true); |
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if (ret) |
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goto unlock; |
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ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET); |
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if (ret) |
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goto err_disable; |
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timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2; |
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if (vadc->poll_eoc) { |
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ret = vadc_poll_wait_eoc(vadc, timeout); |
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} else { |
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ret = wait_for_completion_timeout(&vadc->complete, timeout); |
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if (!ret) { |
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ret = -ETIMEDOUT; |
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goto err_disable; |
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} |
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/* Double check conversion status */ |
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ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US); |
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if (ret) |
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goto err_disable; |
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} |
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ret = vadc_read_result(vadc, data); |
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err_disable: |
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vadc_set_state(vadc, false); |
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if (ret) |
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dev_err(vadc->dev, "conversion failed\n"); |
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unlock: |
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mutex_unlock(&vadc->lock); |
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return ret; |
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} |
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static int vadc_measure_ref_points(struct vadc_priv *vadc) |
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{ |
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struct vadc_channel_prop *prop; |
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u16 read_1, read_2; |
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int ret; |
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vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE; |
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vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV; |
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prop = vadc_get_channel(vadc, VADC_REF_1250MV); |
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ret = vadc_do_conversion(vadc, prop, &read_1); |
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if (ret) |
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goto err; |
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/* Try with buffered 625mV channel first */ |
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prop = vadc_get_channel(vadc, VADC_SPARE1); |
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if (!prop) |
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prop = vadc_get_channel(vadc, VADC_REF_625MV); |
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ret = vadc_do_conversion(vadc, prop, &read_2); |
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if (ret) |
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goto err; |
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if (read_1 == read_2) { |
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ret = -EINVAL; |
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goto err; |
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} |
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vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2; |
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vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2; |
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/* Ratiometric calibration */ |
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prop = vadc_get_channel(vadc, VADC_VDD_VADC); |
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ret = vadc_do_conversion(vadc, prop, &read_1); |
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if (ret) |
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goto err; |
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prop = vadc_get_channel(vadc, VADC_GND_REF); |
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ret = vadc_do_conversion(vadc, prop, &read_2); |
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if (ret) |
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goto err; |
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if (read_1 == read_2) { |
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ret = -EINVAL; |
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goto err; |
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} |
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vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2; |
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vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2; |
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err: |
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if (ret) |
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dev_err(vadc->dev, "measure reference points failed\n"); |
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return ret; |
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} |
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static int vadc_prescaling_from_dt(u32 num, u32 den) |
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{ |
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unsigned int pre; |
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for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++) |
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if (vadc_prescale_ratios[pre].num == num && |
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vadc_prescale_ratios[pre].den == den) |
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break; |
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if (pre == ARRAY_SIZE(vadc_prescale_ratios)) |
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return -EINVAL; |
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return pre; |
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} |
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static int vadc_hw_settle_time_from_dt(u32 value) |
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{ |
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if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000)) |
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return -EINVAL; |
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if (value <= 1000) |
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value /= 100; |
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else |
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value = value / 2000 + 10; |
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return value; |
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} |
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static int vadc_avg_samples_from_dt(u32 value) |
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{ |
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if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX) |
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return -EINVAL; |
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return __ffs64(value); |
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} |
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static int vadc_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int *val, int *val2, |
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long mask) |
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{ |
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struct vadc_priv *vadc = iio_priv(indio_dev); |
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struct vadc_channel_prop *prop; |
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u16 adc_code; |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_PROCESSED: |
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prop = &vadc->chan_props[chan->address]; |
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ret = vadc_do_conversion(vadc, prop, &adc_code); |
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if (ret) |
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break; |
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ret = qcom_vadc_scale(prop->scale_fn_type, |
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&vadc->graph[prop->calibration], |
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&vadc_prescale_ratios[prop->prescale], |
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(prop->calibration == VADC_CALIB_ABSOLUTE), |
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adc_code, val); |
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if (ret) |
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break; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_RAW: |
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prop = &vadc->chan_props[chan->address]; |
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ret = vadc_do_conversion(vadc, prop, &adc_code); |
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if (ret) |
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break; |
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*val = (int)adc_code; |
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return IIO_VAL_INT; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static int vadc_of_xlate(struct iio_dev *indio_dev, |
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const struct of_phandle_args *iiospec) |
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{ |
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struct vadc_priv *vadc = iio_priv(indio_dev); |
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unsigned int i; |
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for (i = 0; i < vadc->nchannels; i++) |
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if (vadc->iio_chans[i].channel == iiospec->args[0]) |
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return i; |
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return -EINVAL; |
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} |
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static const struct iio_info vadc_info = { |
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.read_raw = vadc_read_raw, |
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.of_xlate = vadc_of_xlate, |
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}; |
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struct vadc_channels { |
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const char *datasheet_name; |
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unsigned int prescale_index; |
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enum iio_chan_type type; |
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long info_mask; |
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enum vadc_scale_fn_type scale_fn_type; |
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}; |
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#define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \ |
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[VADC_##_dname] = { \ |
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.datasheet_name = __stringify(_dname), \ |
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.prescale_index = _pre, \ |
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.type = _type, \ |
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.info_mask = _mask, \ |
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.scale_fn_type = _scale \ |
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}, \ |
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#define VADC_NO_CHAN(_dname, _type, _mask, _pre) \ |
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[VADC_##_dname] = { \ |
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.datasheet_name = __stringify(_dname), \ |
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.prescale_index = _pre, \ |
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.type = _type, \ |
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.info_mask = _mask \ |
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}, |
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#define VADC_CHAN_TEMP(_dname, _pre, _scale) \ |
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VADC_CHAN(_dname, IIO_TEMP, \ |
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \ |
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_pre, _scale) \ |
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#define VADC_CHAN_VOLT(_dname, _pre, _scale) \ |
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VADC_CHAN(_dname, IIO_VOLTAGE, \ |
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\ |
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_pre, _scale) \ |
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#define VADC_CHAN_NO_SCALE(_dname, _pre) \ |
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VADC_NO_CHAN(_dname, IIO_VOLTAGE, \ |
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BIT(IIO_CHAN_INFO_RAW), \ |
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_pre) \ |
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|
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/* |
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* The array represents all possible ADC channels found in the supported PMICs. |
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* Every index in the array is equal to the channel number per datasheet. The |
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* gaps in the array should be treated as reserved channels. |
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*/ |
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static const struct vadc_channels vadc_chans[] = { |
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VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT) |
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VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT) |
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VADC_CHAN_NO_SCALE(VCHG_SNS, 3) |
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VADC_CHAN_NO_SCALE(SPARE1_03, 1) |
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VADC_CHAN_NO_SCALE(USB_ID_MV, 1) |
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VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT) |
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VADC_CHAN_NO_SCALE(VBAT_SNS, 1) |
|
VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT) |
|
VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM) |
|
VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT) |
|
VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT) |
|
VADC_CHAN_NO_SCALE(CHG_TEMP, 0) |
|
VADC_CHAN_NO_SCALE(SPARE1, 0) |
|
VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP) |
|
VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT) |
|
VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT) |
|
|
|
VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0) |
|
VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0) |
|
|
|
VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1) |
|
VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1) |
|
|
|
VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0) |
|
VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_DEFAULT) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0) |
|
VADC_CHAN_NO_SCALE(AMUX_PU1, 0) |
|
VADC_CHAN_NO_SCALE(AMUX_PU2, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0) |
|
|
|
VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0) |
|
VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP) |
|
VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP) |
|
VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP) |
|
VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0) |
|
VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP) |
|
VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP) |
|
VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0) |
|
VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM) |
|
|
|
VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0) |
|
|
|
VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0) |
|
VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0) |
|
VADC_CHAN_NO_SCALE(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 = qcom_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) { |
|
of_node_put(child); |
|
return ret; |
|
} |
|
|
|
prop.scale_fn_type = vadc_chans[prop.channel].scale_fn_type; |
|
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->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 <[email protected]>"); |
|
MODULE_AUTHOR("Ivan T. Ivanov <[email protected]>");
|
|
|