// SPDX-License-Identifier: GPL-2.0+ /* * IIO driver for MCP356X/MCP356XR and MCP346X/MCP346XR series ADC chip family * * Copyright (C) 2022-2023 Microchip Technology Inc. and its subsidiaries * * Author: Marius Cristea * * Datasheet for MCP3561, MCP3562, MCP3564 can be found here: * https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP3561-2-4-Family-Data-Sheet-DS20006181C.pdf * Datasheet for MCP3561R, MCP3562R, MCP3564R can be found here: * https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP3561_2_4R-Data-Sheet-DS200006391C.pdf * Datasheet for MCP3461, MCP3462, MCP3464 can be found here: * https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP3461-2-4-Two-Four-Eight-Channel-153.6-ksps-Low-Noise-16-Bit-Delta-Sigma-ADC-Data-Sheet-20006180D.pdf * Datasheet for MCP3461R, MCP3462R, MCP3464R can be found here: * https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP3461-2-4R-Family-Data-Sheet-DS20006404C.pdf */ #include #include #include #include #include #include #include #include #define MCP3564_ADCDATA_REG 0x00 #define MCP3564_CONFIG0_REG 0x01 #define MCP3564_CONFIG0_ADC_MODE_MASK GENMASK(1, 0) /* Current Source/Sink Selection Bits for Sensor Bias */ #define MCP3564_CONFIG0_CS_SEL_MASK GENMASK(3, 2) /* Internal clock is selected and AMCLK is present on the analog master clock output pin */ #define MCP3564_CONFIG0_USE_INT_CLK_OUTPUT_EN 0x03 /* Internal clock is selected and no clock output is present on the CLK pin */ #define MCP3564_CONFIG0_USE_INT_CLK 0x02 /* External digital clock */ #define MCP3564_CONFIG0_USE_EXT_CLK 0x01 /* External digital clock (default) */ #define MCP3564_CONFIG0_USE_EXT_CLK_DEFAULT 0x00 #define MCP3564_CONFIG0_CLK_SEL_MASK GENMASK(5, 4) #define MCP3456_CONFIG0_BIT6_DEFAULT BIT(6) #define MCP3456_CONFIG0_VREF_MASK BIT(7) #define MCP3564_CONFIG1_REG 0x02 #define MCP3564_CONFIG1_OVERSPL_RATIO_MASK GENMASK(5, 2) #define MCP3564_CONFIG2_REG 0x03 #define MCP3564_CONFIG2_AZ_REF_MASK BIT(1) #define MCP3564_CONFIG2_AZ_MUX_MASK BIT(2) #define MCP3564_CONFIG2_HARDWARE_GAIN_MASK GENMASK(5, 3) #define MCP3564_DEFAULT_HARDWARE_GAIN 0x01 #define MCP3564_CONFIG2_BOOST_CURRENT_MASK GENMASK(7, 6) #define MCP3564_CONFIG3_REG 0x04 #define MCP3464_CONFIG3_EN_GAINCAL_MASK BIT(0) #define MCP3464_CONFIG3_EN_OFFCAL_MASK BIT(1) #define MCP3464_CONFIG3_EN_CRCCOM_MASK BIT(2) #define MCP3464_CONFIG3_CRC_FORMAT_MASK BIT(3) /* * ADC Output Data Format 32-bit (25-bit right justified data + Channel ID): * CHID[3:0] + SGN extension (4 bits) + 24-bit ADC data. * It allows overrange with the SGN extension. */ #define MCP3464_CONFIG3_DATA_FMT_32B_WITH_CH_ID 3 /* * ADC Output Data Format 32-bit (25-bit right justified data): * SGN extension (8-bit) + 24-bit ADC data. * It allows overrange with the SGN extension. */ #define MCP3464_CONFIG3_DATA_FMT_32B_SGN_EXT 2 /* * ADC Output Data Format 32-bit (24-bit left justified data): * 24-bit ADC data + 0x00 (8-bit). * It does not allow overrange (ADC code locked to 0xFFFFFF or 0x800000). */ #define MCP3464_CONFIG3_DATA_FMT_32B_LEFT_JUSTIFIED 1 /* * ADC Output Data Format 24-bit (default ADC coding): * 24-bit ADC data. * It does not allow overrange (ADC code locked to 0xFFFFFF or 0x800000). */ #define MCP3464_CONFIG3_DATA_FMT_24B 0 #define MCP3464_CONFIG3_DATA_FORMAT_MASK GENMASK(5, 4) /* Continuous Conversion mode or continuous conversion cycle in SCAN mode. */ #define MCP3464_CONFIG3_CONV_MODE_CONTINUOUS 3 /* * One-shot conversion or one-shot cycle in SCAN mode. It sets ADC_MODE[1:0] to ‘10’ * (standby) at the end of the conversion or at the end of the conversion cycle in SCAN mode. */ #define MCP3464_CONFIG3_CONV_MODE_ONE_SHOT_STANDBY 2 /* * One-shot conversion or one-shot cycle in SCAN mode. It sets ADC_MODE[1:0] to ‘0x’ (ADC * Shutdown) at the end of the conversion or at the end of the conversion cycle in SCAN * mode (default). */ #define MCP3464_CONFIG3_CONV_MODE_ONE_SHOT_SHUTDOWN 0 #define MCP3464_CONFIG3_CONV_MODE_MASK GENMASK(7, 6) #define MCP3564_IRQ_REG 0x05 #define MCP3464_EN_STP_MASK BIT(0) #define MCP3464_EN_FASTCMD_MASK BIT(1) #define MCP3464_IRQ_MODE_0_MASK BIT(2) #define MCP3464_IRQ_MODE_1_MASK BIT(3) #define MCP3564_POR_STATUS_MASK BIT(4) #define MCP3564_CRCCFG_STATUS_MASK BIT(5) #define MCP3564_DATA_READY_MASK BIT(6) #define MCP3564_MUX_REG 0x06 #define MCP3564_MUX_VIN_P_MASK GENMASK(7, 4) #define MCP3564_MUX_VIN_N_MASK GENMASK(3, 0) #define MCP3564_MUX_SET(x, y) (FIELD_PREP(MCP3564_MUX_VIN_P_MASK, (x)) | \ FIELD_PREP(MCP3564_MUX_VIN_N_MASK, (y))) #define MCP3564_SCAN_REG 0x07 #define MCP3564_SCAN_CH_SEL_MASK GENMASK(15, 0) #define MCP3564_SCAN_CH_SEL_SET(x) FIELD_PREP(MCP3564_SCAN_CH_SEL_MASK, (x)) #define MCP3564_SCAN_DELAY_TIME_MASK GENMASK(23, 21) #define MCP3564_SCAN_DELAY_TIME_SET(x) FIELD_PREP(MCP3564_SCAN_DELAY_TIME_MASK, (x)) #define MCP3564_SCAN_DEFAULT_VALUE 0 #define MCP3564_TIMER_REG 0x08 #define MCP3564_TIMER_DEFAULT_VALUE 0 #define MCP3564_OFFSETCAL_REG 0x09 #define MCP3564_DEFAULT_OFFSETCAL 0 #define MCP3564_GAINCAL_REG 0x0A #define MCP3564_DEFAULT_GAINCAL 0x00800000 #define MCP3564_RESERVED_B_REG 0x0B #define MCP3564_RESERVED_C_REG 0x0C #define MCP3564_C_REG_DEFAULT 0x50 #define MCP3564R_C_REG_DEFAULT 0x30 #define MCP3564_LOCK_REG 0x0D #define MCP3564_LOCK_WRITE_ACCESS_PASSWORD 0xA5 #define MCP3564_RESERVED_E_REG 0x0E #define MCP3564_CRCCFG_REG 0x0F #define MCP3564_CMD_HW_ADDR_MASK GENMASK(7, 6) #define MCP3564_CMD_ADDR_MASK GENMASK(5, 2) #define MCP3564_HW_ADDR_MASK GENMASK(1, 0) #define MCP3564_FASTCMD_START 0x0A #define MCP3564_FASTCMD_RESET 0x0E #define MCP3461_HW_ID 0x0008 #define MCP3462_HW_ID 0x0009 #define MCP3464_HW_ID 0x000B #define MCP3561_HW_ID 0x000C #define MCP3562_HW_ID 0x000D #define MCP3564_HW_ID 0x000F #define MCP3564_HW_ID_MASK GENMASK(3, 0) #define MCP3564R_INT_VREF_MV 2400 #define MCP3564_DATA_READY_TIMEOUT_MS 2000 #define MCP3564_MAX_PGA 8 #define MCP3564_MAX_BURNOUT_IDX 4 #define MCP3564_MAX_CHANNELS 66 enum mcp3564_ids { mcp3461, mcp3462, mcp3464, mcp3561, mcp3562, mcp3564, mcp3461r, mcp3462r, mcp3464r, mcp3561r, mcp3562r, mcp3564r, }; enum mcp3564_delay_time { MCP3564_NO_DELAY, MCP3564_DELAY_8_DMCLK, MCP3564_DELAY_16_DMCLK, MCP3564_DELAY_32_DMCLK, MCP3564_DELAY_64_DMCLK, MCP3564_DELAY_128_DMCLK, MCP3564_DELAY_256_DMCLK, MCP3564_DELAY_512_DMCLK }; enum mcp3564_adc_conversion_mode { MCP3564_ADC_MODE_DEFAULT, MCP3564_ADC_MODE_SHUTDOWN, MCP3564_ADC_MODE_STANDBY, MCP3564_ADC_MODE_CONVERSION }; enum mcp3564_adc_bias_current { MCP3564_BOOST_CURRENT_x0_50, MCP3564_BOOST_CURRENT_x0_66, MCP3564_BOOST_CURRENT_x1_00, MCP3564_BOOST_CURRENT_x2_00 }; enum mcp3564_burnout { MCP3564_CONFIG0_CS_SEL_0_0_uA, MCP3564_CONFIG0_CS_SEL_0_9_uA, MCP3564_CONFIG0_CS_SEL_3_7_uA, MCP3564_CONFIG0_CS_SEL_15_uA }; enum mcp3564_channel_names { MCP3564_CH0, MCP3564_CH1, MCP3564_CH2, MCP3564_CH3, MCP3564_CH4, MCP3564_CH5, MCP3564_CH6, MCP3564_CH7, MCP3564_AGND, MCP3564_AVDD, MCP3564_RESERVED, /* do not use */ MCP3564_REFIN_POZ, MCP3564_REFIN_NEG, MCP3564_TEMP_DIODE_P, MCP3564_TEMP_DIODE_M, MCP3564_INTERNAL_VCM, }; enum mcp3564_oversampling { MCP3564_OVERSAMPLING_RATIO_32, MCP3564_OVERSAMPLING_RATIO_64, MCP3564_OVERSAMPLING_RATIO_128, MCP3564_OVERSAMPLING_RATIO_256, MCP3564_OVERSAMPLING_RATIO_512, MCP3564_OVERSAMPLING_RATIO_1024, MCP3564_OVERSAMPLING_RATIO_2048, MCP3564_OVERSAMPLING_RATIO_4096, MCP3564_OVERSAMPLING_RATIO_8192, MCP3564_OVERSAMPLING_RATIO_16384, MCP3564_OVERSAMPLING_RATIO_20480, MCP3564_OVERSAMPLING_RATIO_24576, MCP3564_OVERSAMPLING_RATIO_40960, MCP3564_OVERSAMPLING_RATIO_49152, MCP3564_OVERSAMPLING_RATIO_81920, MCP3564_OVERSAMPLING_RATIO_98304 }; static const unsigned int mcp3564_oversampling_avail[] = { [MCP3564_OVERSAMPLING_RATIO_32] = 32, [MCP3564_OVERSAMPLING_RATIO_64] = 64, [MCP3564_OVERSAMPLING_RATIO_128] = 128, [MCP3564_OVERSAMPLING_RATIO_256] = 256, [MCP3564_OVERSAMPLING_RATIO_512] = 512, [MCP3564_OVERSAMPLING_RATIO_1024] = 1024, [MCP3564_OVERSAMPLING_RATIO_2048] = 2048, [MCP3564_OVERSAMPLING_RATIO_4096] = 4096, [MCP3564_OVERSAMPLING_RATIO_8192] = 8192, [MCP3564_OVERSAMPLING_RATIO_16384] = 16384, [MCP3564_OVERSAMPLING_RATIO_20480] = 20480, [MCP3564_OVERSAMPLING_RATIO_24576] = 24576, [MCP3564_OVERSAMPLING_RATIO_40960] = 40960, [MCP3564_OVERSAMPLING_RATIO_49152] = 49152, [MCP3564_OVERSAMPLING_RATIO_81920] = 81920, [MCP3564_OVERSAMPLING_RATIO_98304] = 98304 }; /* * Current Source/Sink Selection Bits for Sensor Bias (source on VIN+/sink on VIN-) */ static const int mcp3564_burnout_avail[][2] = { [MCP3564_CONFIG0_CS_SEL_0_0_uA] = { 0, 0 }, [MCP3564_CONFIG0_CS_SEL_0_9_uA] = { 0, 900 }, [MCP3564_CONFIG0_CS_SEL_3_7_uA] = { 0, 3700 }, [MCP3564_CONFIG0_CS_SEL_15_uA] = { 0, 15000 } }; /* * BOOST[1:0]: ADC Bias Current Selection */ static const char * const mcp3564_boost_current_avail[] = { [MCP3564_BOOST_CURRENT_x0_50] = "0.5", [MCP3564_BOOST_CURRENT_x0_66] = "0.66", [MCP3564_BOOST_CURRENT_x1_00] = "1", [MCP3564_BOOST_CURRENT_x2_00] = "2", }; /* * Calibration bias values */ static const int mcp3564_calib_bias[] = { -8388608, /* min: -2^23 */ 1, /* step: 1 */ 8388607 /* max: 2^23 - 1 */ }; /* * Calibration scale values * The Gain Error Calibration register (GAINCAL) is an * unsigned 24-bit register that holds the digital gain error * calibration value, GAINCAL which could be calculated by * GAINCAL (V/V) = (GAINCAL[23:0])/8388608 * The gain error calibration value range in equivalent voltage is [0; 2-2^(-23)] */ static const unsigned int mcp3564_calib_scale[] = { 0, /* min: 0 */ 1, /* step: 1/8388608 */ 16777215 /* max: 2 - 2^(-23) */ }; /* Programmable hardware gain x1/3, x1, x2, x4, x8, x16, x32, x64 */ static const int mcp3564_hwgain_frac[] = { 3, 10, 1, 1, 2, 1, 4, 1, 8, 1, 16, 1, 32, 1, 64, 1 }; static const char *mcp3564_channel_labels[2] = { "burnout_current", "temperature", }; /** * struct mcp3564_chip_info - chip specific data * @name: device name * @num_channels: number of channels * @resolution: ADC resolution * @have_vref: does the hardware have an internal voltage reference? */ struct mcp3564_chip_info { const char *name; unsigned int num_channels; unsigned int resolution; bool have_vref; }; /** * struct mcp3564_state - working data for a ADC device * @chip_info: chip specific data * @spi: SPI device structure * @vref: the regulator device used as a voltage reference in case * external voltage reference is used * @vref_mv: voltage reference value in miliVolts * @lock: synchronize access to driver's state members * @dev_addr: hardware device address * @oversampling: the index inside oversampling list of the ADC * @hwgain: the index inside hardware gain list of the ADC * @scale_tbls: table with precalculated scale * @calib_bias: calibration bias value * @calib_scale: calibration scale value * @current_boost_mode: the index inside current boost list of the ADC * @burnout_mode: the index inside current bias list of the ADC * @auto_zeroing_mux: set if ADC auto-zeroing algorithm is enabled * @auto_zeroing_ref: set if ADC auto-Zeroing Reference Buffer Setting is enabled * @have_vref: does the ADC have an internal voltage reference? * @labels: table with channels labels */ struct mcp3564_state { const struct mcp3564_chip_info *chip_info; struct spi_device *spi; struct regulator *vref; unsigned short vref_mv; struct mutex lock; /* Synchronize access to driver's state members */ u8 dev_addr; enum mcp3564_oversampling oversampling; unsigned int hwgain; unsigned int scale_tbls[MCP3564_MAX_PGA][2]; int calib_bias; int calib_scale; unsigned int current_boost_mode; enum mcp3564_burnout burnout_mode; bool auto_zeroing_mux; bool auto_zeroing_ref; bool have_vref; const char *labels[MCP3564_MAX_CHANNELS]; }; static inline u8 mcp3564_cmd_write(u8 chip_addr, u8 reg) { return FIELD_PREP(MCP3564_CMD_HW_ADDR_MASK, chip_addr) | FIELD_PREP(MCP3564_CMD_ADDR_MASK, reg) | BIT(1); } static inline u8 mcp3564_cmd_read(u8 chip_addr, u8 reg) { return FIELD_PREP(MCP3564_CMD_HW_ADDR_MASK, chip_addr) | FIELD_PREP(MCP3564_CMD_ADDR_MASK, reg) | BIT(0); } static int mcp3564_read_8bits(struct mcp3564_state *adc, u8 reg, u8 *val) { int ret; u8 tx_buf; u8 rx_buf; tx_buf = mcp3564_cmd_read(adc->dev_addr, reg); ret = spi_write_then_read(adc->spi, &tx_buf, sizeof(tx_buf), &rx_buf, sizeof(rx_buf)); *val = rx_buf; return ret; } static int mcp3564_read_16bits(struct mcp3564_state *adc, u8 reg, u16 *val) { int ret; u8 tx_buf; __be16 rx_buf; tx_buf = mcp3564_cmd_read(adc->dev_addr, reg); ret = spi_write_then_read(adc->spi, &tx_buf, sizeof(tx_buf), &rx_buf, sizeof(rx_buf)); *val = be16_to_cpu(rx_buf); return ret; } static int mcp3564_read_32bits(struct mcp3564_state *adc, u8 reg, u32 *val) { int ret; u8 tx_buf; __be32 rx_buf; tx_buf = mcp3564_cmd_read(adc->dev_addr, reg); ret = spi_write_then_read(adc->spi, &tx_buf, sizeof(tx_buf), &rx_buf, sizeof(rx_buf)); *val = be32_to_cpu(rx_buf); return ret; } static int mcp3564_write_8bits(struct mcp3564_state *adc, u8 reg, u8 val) { u8 tx_buf[2]; tx_buf[0] = mcp3564_cmd_write(adc->dev_addr, reg); tx_buf[1] = val; return spi_write_then_read(adc->spi, tx_buf, sizeof(tx_buf), NULL, 0); } static int mcp3564_write_24bits(struct mcp3564_state *adc, u8 reg, u32 val) { __be32 val_be; val |= (mcp3564_cmd_write(adc->dev_addr, reg) << 24); val_be = cpu_to_be32(val); return spi_write_then_read(adc->spi, &val_be, sizeof(val_be), NULL, 0); } static int mcp3564_fast_cmd(struct mcp3564_state *adc, u8 fast_cmd) { u8 val; val = FIELD_PREP(MCP3564_CMD_HW_ADDR_MASK, adc->dev_addr) | FIELD_PREP(MCP3564_CMD_ADDR_MASK, fast_cmd); return spi_write_then_read(adc->spi, &val, 1, NULL, 0); } static int mcp3564_update_8bits(struct mcp3564_state *adc, u8 reg, u32 mask, u8 val) { u8 tmp; int ret; val &= mask; ret = mcp3564_read_8bits(adc, reg, &tmp); if (ret < 0) return ret; tmp &= ~mask; tmp |= val; return mcp3564_write_8bits(adc, reg, tmp); } static int mcp3564_set_current_boost_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, unsigned int mode) { struct mcp3564_state *adc = iio_priv(indio_dev); int ret; dev_dbg(&indio_dev->dev, "%s: %d\n", __func__, mode); mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_BOOST_CURRENT_MASK, FIELD_PREP(MCP3564_CONFIG2_BOOST_CURRENT_MASK, mode)); if (ret) dev_err(&indio_dev->dev, "Failed to configure CONFIG2 register\n"); else adc->current_boost_mode = mode; mutex_unlock(&adc->lock); return ret; } static int mcp3564_get_current_boost_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { struct mcp3564_state *adc = iio_priv(indio_dev); return adc->current_boost_mode; } static const struct iio_enum mcp3564_current_boost_mode_enum = { .items = mcp3564_boost_current_avail, .num_items = ARRAY_SIZE(mcp3564_boost_current_avail), .set = mcp3564_set_current_boost_mode, .get = mcp3564_get_current_boost_mode, }; static const struct iio_chan_spec_ext_info mcp3564_ext_info[] = { IIO_ENUM("boost_current_gain", IIO_SHARED_BY_ALL, &mcp3564_current_boost_mode_enum), { .name = "boost_current_gain_available", .shared = IIO_SHARED_BY_ALL, .read = iio_enum_available_read, .private = (uintptr_t)&mcp3564_current_boost_mode_enum, }, { } }; static ssize_t mcp3564_auto_zeroing_mux_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mcp3564_state *adc = iio_priv(indio_dev); return sysfs_emit(buf, "%d\n", adc->auto_zeroing_mux); } static ssize_t mcp3564_auto_zeroing_mux_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mcp3564_state *adc = iio_priv(indio_dev); bool auto_zero; int ret; ret = kstrtobool(buf, &auto_zero); if (ret) return ret; mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_AZ_MUX_MASK, FIELD_PREP(MCP3564_CONFIG2_AZ_MUX_MASK, auto_zero)); if (ret) dev_err(&indio_dev->dev, "Failed to update CONFIG2 register\n"); else adc->auto_zeroing_mux = auto_zero; mutex_unlock(&adc->lock); return ret ? ret : len; } static ssize_t mcp3564_auto_zeroing_ref_show(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mcp3564_state *adc = iio_priv(indio_dev); return sysfs_emit(buf, "%d\n", adc->auto_zeroing_ref); } static ssize_t mcp3564_auto_zeroing_ref_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mcp3564_state *adc = iio_priv(indio_dev); bool auto_zero; int ret; ret = kstrtobool(buf, &auto_zero); if (ret) return ret; mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_AZ_REF_MASK, FIELD_PREP(MCP3564_CONFIG2_AZ_REF_MASK, auto_zero)); if (ret) dev_err(&indio_dev->dev, "Failed to update CONFIG2 register\n"); else adc->auto_zeroing_ref = auto_zero; mutex_unlock(&adc->lock); return ret ? ret : len; } static const struct iio_chan_spec mcp3564_channel_template = { .type = IIO_VOLTAGE, .indexed = 1, .differential = 1, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), .ext_info = mcp3564_ext_info, }; static const struct iio_chan_spec mcp3564_temp_channel_template = { .type = IIO_TEMP, .channel = 0, .address = ((MCP3564_TEMP_DIODE_P << 4) | MCP3564_TEMP_DIODE_M), .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), }; static const struct iio_chan_spec mcp3564_burnout_channel_template = { .type = IIO_CURRENT, .output = true, .channel = 0, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW), }; /* * Number of channels could be calculated: * num_channels = single_ended_input + differential_input + temperature + burnout * Eg. for MCP3561 (only 2 channels available: CH0 and CH1) * single_ended_input = (CH0 - GND), (CH1 - GND) = 2 * differential_input = (CH0 - CH1), (CH0 - CH0) = 2 * num_channels = 2 + 2 + 2 * Generic formula is: * num_channels = P^R(Number_of_single_ended_channels, 2) + 2 (temperature + burnout channels) * P^R(Number_of_single_ended_channels, 2) is Permutations with Replacement of * Number_of_single_ended_channels taken by 2 */ static const struct mcp3564_chip_info mcp3564_chip_infos_tbl[] = { [mcp3461] = { .name = "mcp3461", .num_channels = 6, .resolution = 16, .have_vref = false, }, [mcp3462] = { .name = "mcp3462", .num_channels = 18, .resolution = 16, .have_vref = false, }, [mcp3464] = { .name = "mcp3464", .num_channels = 66, .resolution = 16, .have_vref = false, }, [mcp3561] = { .name = "mcp3561", .num_channels = 6, .resolution = 24, .have_vref = false, }, [mcp3562] = { .name = "mcp3562", .num_channels = 18, .resolution = 24, .have_vref = false, }, [mcp3564] = { .name = "mcp3564", .num_channels = 66, .resolution = 24, .have_vref = false, }, [mcp3461r] = { .name = "mcp3461r", .num_channels = 6, .resolution = 16, .have_vref = false, }, [mcp3462r] = { .name = "mcp3462r", .num_channels = 18, .resolution = 16, .have_vref = true, }, [mcp3464r] = { .name = "mcp3464r", .num_channels = 66, .resolution = 16, .have_vref = true, }, [mcp3561r] = { .name = "mcp3561r", .num_channels = 6, .resolution = 24, .have_vref = true, }, [mcp3562r] = { .name = "mcp3562r", .num_channels = 18, .resolution = 24, .have_vref = true, }, [mcp3564r] = { .name = "mcp3564r", .num_channels = 66, .resolution = 24, .have_vref = true, }, }; static int mcp3564_read_single_value(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val) { struct mcp3564_state *adc = iio_priv(indio_dev); int ret; u8 tmp; int ret_read = 0; ret = mcp3564_write_8bits(adc, MCP3564_MUX_REG, channel->address); if (ret) return ret; /* Start ADC Conversion using fast command (overwrites ADC_MODE[1:0] = 11) */ ret = mcp3564_fast_cmd(adc, MCP3564_FASTCMD_START); if (ret) return ret; /* * Check if the conversion is ready. If not, wait a little bit, and * in case of timeout exit with an error. */ ret = read_poll_timeout(mcp3564_read_8bits, ret_read, ret_read || !(tmp & MCP3564_DATA_READY_MASK), 20000, MCP3564_DATA_READY_TIMEOUT_MS * 1000, true, adc, MCP3564_IRQ_REG, &tmp); /* failed to read status register */ if (ret_read) return ret_read; if (ret) return ret; if (tmp & MCP3564_DATA_READY_MASK) /* failing to finish conversion */ return -EBUSY; return mcp3564_read_32bits(adc, MCP3564_ADCDATA_REG, val); } static int mcp3564_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, const int **vals, int *type, int *length, long mask) { struct mcp3564_state *adc = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: if (!channel->output) return -EINVAL; *vals = mcp3564_burnout_avail[0]; *length = ARRAY_SIZE(mcp3564_burnout_avail) * 2; *type = IIO_VAL_INT_PLUS_MICRO; return IIO_AVAIL_LIST; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *vals = mcp3564_oversampling_avail; *length = ARRAY_SIZE(mcp3564_oversampling_avail); *type = IIO_VAL_INT; return IIO_AVAIL_LIST; case IIO_CHAN_INFO_SCALE: *vals = (int *)adc->scale_tbls; *length = ARRAY_SIZE(adc->scale_tbls) * 2; *type = IIO_VAL_INT_PLUS_NANO; return IIO_AVAIL_LIST; case IIO_CHAN_INFO_CALIBBIAS: *vals = mcp3564_calib_bias; *type = IIO_VAL_INT; return IIO_AVAIL_RANGE; case IIO_CHAN_INFO_CALIBSCALE: *vals = mcp3564_calib_scale; *type = IIO_VAL_INT; return IIO_AVAIL_RANGE; default: return -EINVAL; } } static int mcp3564_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { struct mcp3564_state *adc = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: if (channel->output) { mutex_lock(&adc->lock); *val = mcp3564_burnout_avail[adc->burnout_mode][0]; *val2 = mcp3564_burnout_avail[adc->burnout_mode][1]; mutex_unlock(&adc->lock); return IIO_VAL_INT_PLUS_MICRO; } ret = mcp3564_read_single_value(indio_dev, channel, val); if (ret) return -EINVAL; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: mutex_lock(&adc->lock); *val = adc->scale_tbls[adc->hwgain][0]; *val2 = adc->scale_tbls[adc->hwgain][1]; mutex_unlock(&adc->lock); return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *val = mcp3564_oversampling_avail[adc->oversampling]; return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBBIAS: *val = adc->calib_bias; return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBSCALE: *val = adc->calib_scale; return IIO_VAL_INT; default: return -EINVAL; } } static int mcp3564_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, long info) { switch (info) { case IIO_CHAN_INFO_RAW: return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_CALIBBIAS: case IIO_CHAN_INFO_CALIBSCALE: case IIO_CHAN_INFO_OVERSAMPLING_RATIO: return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: return IIO_VAL_INT_PLUS_NANO; default: return -EINVAL; } } static int mcp3564_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int val, int val2, long mask) { struct mcp3564_state *adc = iio_priv(indio_dev); int tmp; unsigned int hwgain; enum mcp3564_burnout burnout; int ret = 0; switch (mask) { case IIO_CHAN_INFO_RAW: if (!channel->output) return -EINVAL; for (burnout = 0; burnout < MCP3564_MAX_BURNOUT_IDX; burnout++) if (val == mcp3564_burnout_avail[burnout][0] && val2 == mcp3564_burnout_avail[burnout][1]) break; if (burnout == MCP3564_MAX_BURNOUT_IDX) return -EINVAL; if (burnout == adc->burnout_mode) return ret; mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG0_REG, MCP3564_CONFIG0_CS_SEL_MASK, FIELD_PREP(MCP3564_CONFIG0_CS_SEL_MASK, burnout)); if (ret) dev_err(&indio_dev->dev, "Failed to configure burnout current\n"); else adc->burnout_mode = burnout; mutex_unlock(&adc->lock); return ret; case IIO_CHAN_INFO_CALIBBIAS: if (val < mcp3564_calib_bias[0] || val > mcp3564_calib_bias[2]) return -EINVAL; mutex_lock(&adc->lock); ret = mcp3564_write_24bits(adc, MCP3564_OFFSETCAL_REG, val); if (!ret) adc->calib_bias = val; mutex_unlock(&adc->lock); return ret; case IIO_CHAN_INFO_CALIBSCALE: if (val < mcp3564_calib_scale[0] || val > mcp3564_calib_scale[2]) return -EINVAL; if (adc->calib_scale == val) return ret; mutex_lock(&adc->lock); ret = mcp3564_write_24bits(adc, MCP3564_GAINCAL_REG, val); if (!ret) adc->calib_scale = val; mutex_unlock(&adc->lock); return ret; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: if (val < 0) return -EINVAL; tmp = find_closest(val, mcp3564_oversampling_avail, ARRAY_SIZE(mcp3564_oversampling_avail)); if (adc->oversampling == tmp) return ret; mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG1_REG, MCP3564_CONFIG1_OVERSPL_RATIO_MASK, FIELD_PREP(MCP3564_CONFIG1_OVERSPL_RATIO_MASK, adc->oversampling)); if (!ret) adc->oversampling = tmp; mutex_unlock(&adc->lock); return ret; case IIO_CHAN_INFO_SCALE: for (hwgain = 0; hwgain < MCP3564_MAX_PGA; hwgain++) if (val == adc->scale_tbls[hwgain][0] && val2 == adc->scale_tbls[hwgain][1]) break; if (hwgain == MCP3564_MAX_PGA) return -EINVAL; if (hwgain == adc->hwgain) return ret; mutex_lock(&adc->lock); ret = mcp3564_update_8bits(adc, MCP3564_CONFIG2_REG, MCP3564_CONFIG2_HARDWARE_GAIN_MASK, FIELD_PREP(MCP3564_CONFIG2_HARDWARE_GAIN_MASK, hwgain)); if (!ret) adc->hwgain = hwgain; mutex_unlock(&adc->lock); return ret; default: return -EINVAL; } } static int mcp3564_read_label(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, char *label) { struct mcp3564_state *adc = iio_priv(indio_dev); return sprintf(label, "%s\n", adc->labels[chan->scan_index]); } static int mcp3564_parse_fw_children(struct iio_dev *indio_dev) { struct mcp3564_state *adc = iio_priv(indio_dev); struct device *dev = &adc->spi->dev; struct iio_chan_spec *channels; struct fwnode_handle *child; struct iio_chan_spec chanspec = mcp3564_channel_template; struct iio_chan_spec temp_chanspec = mcp3564_temp_channel_template; struct iio_chan_spec burnout_chanspec = mcp3564_burnout_channel_template; int chan_idx = 0; unsigned int num_ch; u32 inputs[2]; const char *node_name; const char *label; int ret; num_ch = device_get_child_node_count(dev); if (num_ch == 0) return dev_err_probe(&indio_dev->dev, -ENODEV, "FW has no channels defined\n"); /* Reserve space for burnout and temperature channel */ num_ch += 2; if (num_ch > adc->chip_info->num_channels) return dev_err_probe(dev, -EINVAL, "Too many channels %d > %d\n", num_ch, adc->chip_info->num_channels); channels = devm_kcalloc(dev, num_ch, sizeof(*channels), GFP_KERNEL); if (!channels) return dev_err_probe(dev, -ENOMEM, "Can't allocate memory\n"); device_for_each_child_node(dev, child) { node_name = fwnode_get_name(child); if (fwnode_property_present(child, "diff-channels")) { ret = fwnode_property_read_u32_array(child, "diff-channels", inputs, ARRAY_SIZE(inputs)); chanspec.differential = 1; } else { ret = fwnode_property_read_u32(child, "reg", &inputs[0]); chanspec.differential = 0; inputs[1] = MCP3564_AGND; } if (ret) { fwnode_handle_put(child); return ret; } if (inputs[0] > MCP3564_INTERNAL_VCM || inputs[1] > MCP3564_INTERNAL_VCM) { fwnode_handle_put(child); return dev_err_probe(&indio_dev->dev, -EINVAL, "Channel index > %d, for %s\n", MCP3564_INTERNAL_VCM + 1, node_name); } chanspec.address = (inputs[0] << 4) | inputs[1]; chanspec.channel = inputs[0]; chanspec.channel2 = inputs[1]; chanspec.scan_index = chan_idx; if (fwnode_property_present(child, "label")) { fwnode_property_read_string(child, "label", &label); adc->labels[chan_idx] = label; } channels[chan_idx] = chanspec; chan_idx++; } /* Add burnout current channel */ burnout_chanspec.scan_index = chan_idx; channels[chan_idx] = burnout_chanspec; adc->labels[chan_idx] = mcp3564_channel_labels[0]; chanspec.scan_index = chan_idx; chan_idx++; /* Add temperature channel */ temp_chanspec.scan_index = chan_idx; channels[chan_idx] = temp_chanspec; adc->labels[chan_idx] = mcp3564_channel_labels[1]; chan_idx++; indio_dev->num_channels = chan_idx; indio_dev->channels = channels; return 0; } static void mcp3564_disable_reg(void *reg) { regulator_disable(reg); } static void mcp3564_fill_scale_tbls(struct mcp3564_state *adc) { unsigned int pow = adc->chip_info->resolution - 1; int ref; unsigned int i; int tmp0; u64 tmp1; for (i = 0; i < MCP3564_MAX_PGA; i++) { ref = adc->vref_mv; tmp1 = ((u64)ref * NANO) >> pow; div_u64_rem(tmp1, NANO, &tmp0); tmp1 = tmp1 * mcp3564_hwgain_frac[(2 * i) + 1]; tmp0 = (int)div_u64(tmp1, mcp3564_hwgain_frac[2 * i]); adc->scale_tbls[i][1] = tmp0; } } static int mcp3564_config(struct iio_dev *indio_dev) { struct mcp3564_state *adc = iio_priv(indio_dev); struct device *dev = &adc->spi->dev; const struct spi_device_id *dev_id; u8 tmp_reg; u16 tmp_u16; enum mcp3564_ids ids; int ret = 0; unsigned int tmp = 0x01; bool err = false; /* * The address is set on a per-device basis by fuses in the factory, * configured on request. If not requested, the fuses are set for 0x1. * The device address is part of the device markings to avoid * potential confusion. This address is coded on two bits, so four possible * addresses are available when multiple devices are present on the same * SPI bus with only one Chip Select line for all devices. */ device_property_read_u32(dev, "microchip,hw-device-address", &tmp); if (tmp > 3) { dev_err_probe(dev, tmp, "invalid device address. Must be in range 0-3.\n"); return -EINVAL; } adc->dev_addr = FIELD_GET(MCP3564_HW_ADDR_MASK, tmp); dev_dbg(dev, "use HW device address %i\n", adc->dev_addr); ret = mcp3564_read_8bits(adc, MCP3564_RESERVED_C_REG, &tmp_reg); if (ret < 0) return ret; switch (tmp_reg) { case MCP3564_C_REG_DEFAULT: adc->have_vref = false; break; case MCP3564R_C_REG_DEFAULT: adc->have_vref = true; break; default: dev_info(dev, "Unknown chip found: %d\n", tmp_reg); err = true; } if (!err) { ret = mcp3564_read_16bits(adc, MCP3564_RESERVED_E_REG, &tmp_u16); if (ret < 0) return ret; switch (tmp_u16 & MCP3564_HW_ID_MASK) { case MCP3461_HW_ID: if (adc->have_vref) ids = mcp3461r; else ids = mcp3461; break; case MCP3462_HW_ID: if (adc->have_vref) ids = mcp3462r; else ids = mcp3462; break; case MCP3464_HW_ID: if (adc->have_vref) ids = mcp3464r; else ids = mcp3464; break; case MCP3561_HW_ID: if (adc->have_vref) ids = mcp3561r; else ids = mcp3561; break; case MCP3562_HW_ID: if (adc->have_vref) ids = mcp3562r; else ids = mcp3562; break; case MCP3564_HW_ID: if (adc->have_vref) ids = mcp3564r; else ids = mcp3564; break; default: dev_info(dev, "Unknown chip found: %d\n", tmp_u16); err = true; } } if (err) { /* * If failed to identify the hardware based on internal registers, * try using fallback compatible in device tree to deal with some newer part number. */ adc->chip_info = spi_get_device_match_data(adc->spi); if (!adc->chip_info) { dev_id = spi_get_device_id(adc->spi); adc->chip_info = (const struct mcp3564_chip_info *)dev_id->driver_data; } adc->have_vref = adc->chip_info->have_vref; } else { adc->chip_info = &mcp3564_chip_infos_tbl[ids]; } dev_dbg(dev, "Found %s chip\n", adc->chip_info->name); adc->vref = devm_regulator_get_optional(dev, "vref"); if (IS_ERR(adc->vref)) { if (PTR_ERR(adc->vref) != -ENODEV) return dev_err_probe(dev, PTR_ERR(adc->vref), "failed to get regulator\n"); /* Check if chip has internal vref */ if (!adc->have_vref) return dev_err_probe(dev, PTR_ERR(adc->vref), "Unknown Vref\n"); adc->vref = NULL; dev_dbg(dev, "%s: Using internal Vref\n", __func__); } else { ret = regulator_enable(adc->vref); if (ret) return ret; ret = devm_add_action_or_reset(dev, mcp3564_disable_reg, adc->vref); if (ret) return ret; dev_dbg(dev, "%s: Using External Vref\n", __func__); ret = regulator_get_voltage(adc->vref); if (ret < 0) return dev_err_probe(dev, ret, "Failed to read vref regulator\n"); adc->vref_mv = ret / MILLI; } ret = mcp3564_parse_fw_children(indio_dev); if (ret) return ret; /* * Command sequence that ensures a recovery with the desired settings * in any cases of loss-of-power scenario (Full Chip Reset): * - Write LOCK register to 0xA5 * - Write IRQ register to 0x03 * - Send "Device Full Reset" fast command * - Wait 1ms for "Full Reset" to complete */ ret = mcp3564_write_8bits(adc, MCP3564_LOCK_REG, MCP3564_LOCK_WRITE_ACCESS_PASSWORD); if (ret) return ret; ret = mcp3564_write_8bits(adc, MCP3564_IRQ_REG, 0x03); if (ret) return ret; ret = mcp3564_fast_cmd(adc, MCP3564_FASTCMD_RESET); if (ret) return ret; /* * After Full reset wait some time to be able to fully reset the part and place * it back in a default configuration. * From datasheet: POR (Power On Reset Time) is ~1us * 1ms should be enough. */ mdelay(1); /* set a gain of 1x for GAINCAL */ ret = mcp3564_write_24bits(adc, MCP3564_GAINCAL_REG, MCP3564_DEFAULT_GAINCAL); if (ret) return ret; adc->calib_scale = MCP3564_DEFAULT_GAINCAL; ret = mcp3564_write_24bits(adc, MCP3564_OFFSETCAL_REG, MCP3564_DEFAULT_OFFSETCAL); if (ret) return ret; ret = mcp3564_write_24bits(adc, MCP3564_TIMER_REG, MCP3564_TIMER_DEFAULT_VALUE); if (ret) return ret; ret = mcp3564_write_24bits(adc, MCP3564_SCAN_REG, MCP3564_SCAN_DELAY_TIME_SET(MCP3564_NO_DELAY) | MCP3564_SCAN_CH_SEL_SET(MCP3564_SCAN_DEFAULT_VALUE)); if (ret) return ret; ret = mcp3564_write_8bits(adc, MCP3564_MUX_REG, MCP3564_MUX_SET(MCP3564_CH0, MCP3564_CH1)); if (ret) return ret; ret = mcp3564_write_8bits(adc, MCP3564_IRQ_REG, FIELD_PREP(MCP3464_EN_FASTCMD_MASK, 1) | FIELD_PREP(MCP3464_EN_STP_MASK, 1)); if (ret) return ret; tmp_reg = FIELD_PREP(MCP3464_CONFIG3_CONV_MODE_MASK, MCP3464_CONFIG3_CONV_MODE_ONE_SHOT_STANDBY); tmp_reg |= FIELD_PREP(MCP3464_CONFIG3_DATA_FORMAT_MASK, MCP3464_CONFIG3_DATA_FMT_32B_SGN_EXT); tmp_reg |= MCP3464_CONFIG3_EN_OFFCAL_MASK; tmp_reg |= MCP3464_CONFIG3_EN_GAINCAL_MASK; ret = mcp3564_write_8bits(adc, MCP3564_CONFIG3_REG, tmp_reg); if (ret) return ret; tmp_reg = FIELD_PREP(MCP3564_CONFIG2_BOOST_CURRENT_MASK, MCP3564_BOOST_CURRENT_x1_00); tmp_reg |= FIELD_PREP(MCP3564_CONFIG2_HARDWARE_GAIN_MASK, 0x01); tmp_reg |= FIELD_PREP(MCP3564_CONFIG2_AZ_MUX_MASK, 1); ret = mcp3564_write_8bits(adc, MCP3564_CONFIG2_REG, tmp_reg); if (ret) return ret; adc->hwgain = 0x01; adc->auto_zeroing_mux = true; adc->auto_zeroing_ref = false; adc->current_boost_mode = MCP3564_BOOST_CURRENT_x1_00; tmp_reg = FIELD_PREP(MCP3564_CONFIG1_OVERSPL_RATIO_MASK, MCP3564_OVERSAMPLING_RATIO_98304); ret = mcp3564_write_8bits(adc, MCP3564_CONFIG1_REG, tmp_reg); if (ret) return ret; adc->oversampling = MCP3564_OVERSAMPLING_RATIO_98304; tmp_reg = FIELD_PREP(MCP3564_CONFIG0_ADC_MODE_MASK, MCP3564_ADC_MODE_STANDBY); tmp_reg |= FIELD_PREP(MCP3564_CONFIG0_CS_SEL_MASK, MCP3564_CONFIG0_CS_SEL_0_0_uA); tmp_reg |= FIELD_PREP(MCP3564_CONFIG0_CLK_SEL_MASK, MCP3564_CONFIG0_USE_INT_CLK); tmp_reg |= MCP3456_CONFIG0_BIT6_DEFAULT; if (!adc->vref) { tmp_reg |= FIELD_PREP(MCP3456_CONFIG0_VREF_MASK, 1); adc->vref_mv = MCP3564R_INT_VREF_MV; } ret = mcp3564_write_8bits(adc, MCP3564_CONFIG0_REG, tmp_reg); adc->burnout_mode = MCP3564_CONFIG0_CS_SEL_0_0_uA; return ret; } static IIO_DEVICE_ATTR(auto_zeroing_ref_enable, 0644, mcp3564_auto_zeroing_ref_show, mcp3564_auto_zeroing_ref_store, 0); static IIO_DEVICE_ATTR(auto_zeroing_mux_enable, 0644, mcp3564_auto_zeroing_mux_show, mcp3564_auto_zeroing_mux_store, 0); static struct attribute *mcp3564_attributes[] = { &iio_dev_attr_auto_zeroing_mux_enable.dev_attr.attr, NULL }; static struct attribute *mcp3564r_attributes[] = { &iio_dev_attr_auto_zeroing_mux_enable.dev_attr.attr, &iio_dev_attr_auto_zeroing_ref_enable.dev_attr.attr, NULL }; static struct attribute_group mcp3564_attribute_group = { .attrs = mcp3564_attributes, }; static struct attribute_group mcp3564r_attribute_group = { .attrs = mcp3564r_attributes, }; static const struct iio_info mcp3564_info = { .read_raw = mcp3564_read_raw, .read_avail = mcp3564_read_avail, .write_raw = mcp3564_write_raw, .write_raw_get_fmt = mcp3564_write_raw_get_fmt, .read_label = mcp3564_read_label, .attrs = &mcp3564_attribute_group, }; static const struct iio_info mcp3564r_info = { .read_raw = mcp3564_read_raw, .read_avail = mcp3564_read_avail, .write_raw = mcp3564_write_raw, .write_raw_get_fmt = mcp3564_write_raw_get_fmt, .read_label = mcp3564_read_label, .attrs = &mcp3564r_attribute_group, }; static int mcp3564_probe(struct spi_device *spi) { int ret; struct iio_dev *indio_dev; struct mcp3564_state *adc; indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc)); if (!indio_dev) return -ENOMEM; adc = iio_priv(indio_dev); adc->spi = spi; dev_dbg(&spi->dev, "%s: probe(spi = 0x%p)\n", __func__, spi); /* * Do any chip specific initialization, e.g: * read/write some registers * enable/disable certain channels * change the sampling rate to the requested value */ ret = mcp3564_config(indio_dev); if (ret) return dev_err_probe(&spi->dev, ret, "Can't configure MCP356X device\n"); dev_dbg(&spi->dev, "%s: Vref (mV): %d\n", __func__, adc->vref_mv); mcp3564_fill_scale_tbls(adc); indio_dev->name = adc->chip_info->name; indio_dev->modes = INDIO_DIRECT_MODE; if (!adc->vref) indio_dev->info = &mcp3564r_info; else indio_dev->info = &mcp3564_info; mutex_init(&adc->lock); ret = devm_iio_device_register(&spi->dev, indio_dev); if (ret) return dev_err_probe(&spi->dev, ret, "Can't register IIO device\n"); return 0; } static const struct of_device_id mcp3564_dt_ids[] = { { .compatible = "microchip,mcp3461", .data = &mcp3564_chip_infos_tbl[mcp3461] }, { .compatible = "microchip,mcp3462", .data = &mcp3564_chip_infos_tbl[mcp3462] }, { .compatible = "microchip,mcp3464", .data = &mcp3564_chip_infos_tbl[mcp3464] }, { .compatible = "microchip,mcp3561", .data = &mcp3564_chip_infos_tbl[mcp3561] }, { .compatible = "microchip,mcp3562", .data = &mcp3564_chip_infos_tbl[mcp3562] }, { .compatible = "microchip,mcp3564", .data = &mcp3564_chip_infos_tbl[mcp3564] }, { .compatible = "microchip,mcp3461r", .data = &mcp3564_chip_infos_tbl[mcp3461r] }, { .compatible = "microchip,mcp3462r", .data = &mcp3564_chip_infos_tbl[mcp3462r] }, { .compatible = "microchip,mcp3464r", .data = &mcp3564_chip_infos_tbl[mcp3464r] }, { .compatible = "microchip,mcp3561r", .data = &mcp3564_chip_infos_tbl[mcp3561r] }, { .compatible = "microchip,mcp3562r", .data = &mcp3564_chip_infos_tbl[mcp3562r] }, { .compatible = "microchip,mcp3564r", .data = &mcp3564_chip_infos_tbl[mcp3564r] }, { } }; MODULE_DEVICE_TABLE(of, mcp3564_dt_ids); static const struct spi_device_id mcp3564_id[] = { { "mcp3461", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3461] }, { "mcp3462", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3462] }, { "mcp3464", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3464] }, { "mcp3561", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3561] }, { "mcp3562", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3562] }, { "mcp3564", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3564] }, { "mcp3461r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3461r] }, { "mcp3462r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3462r] }, { "mcp3464r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3464r] }, { "mcp3561r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3561r] }, { "mcp3562r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3562r] }, { "mcp3564r", (kernel_ulong_t)&mcp3564_chip_infos_tbl[mcp3564r] }, { } }; MODULE_DEVICE_TABLE(spi, mcp3564_id); static struct spi_driver mcp3564_driver = { .driver = { .name = "mcp3564", .of_match_table = mcp3564_dt_ids, }, .probe = mcp3564_probe, .id_table = mcp3564_id, }; module_spi_driver(mcp3564_driver); MODULE_AUTHOR("Marius Cristea "); MODULE_DESCRIPTION("Microchip MCP346x/MCP346xR and MCP356x/MCP356xR ADCs"); MODULE_LICENSE("GPL v2");