// SPDX-License-Identifier: GPL-2.0 /* * The GE HealthCare PMC ADC is a 16-Channel (Voltage and current), 16-Bit * ADC with an I2C Interface. * * Copyright (C) 2024, GE HealthCare * * Authors: * Herve Codina */ #include #include #include #include #include #include #include #include struct pmc_adc { struct i2c_client *client; }; #define PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION 0x01 #define PMC_ADC_CMD_READ_VOLTAGE(_ch) (0x10 | (_ch)) #define PMC_ADC_CMD_READ_CURRENT(_ch) (0x20 | (_ch)) #define PMC_ADC_VOLTAGE_CHANNEL(_ch, _ds_name) { \ .type = IIO_VOLTAGE, \ .indexed = 1, \ .channel = (_ch), \ .address = PMC_ADC_CMD_READ_VOLTAGE(_ch), \ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ .datasheet_name = (_ds_name), \ } #define PMC_ADC_CURRENT_CHANNEL(_ch, _ds_name) { \ .type = IIO_CURRENT, \ .indexed = 1, \ .channel = (_ch), \ .address = PMC_ADC_CMD_READ_CURRENT(_ch), \ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ .datasheet_name = (_ds_name), \ } static const struct iio_chan_spec pmc_adc_channels[] = { PMC_ADC_VOLTAGE_CHANNEL(0, "CH0_V"), PMC_ADC_VOLTAGE_CHANNEL(1, "CH1_V"), PMC_ADC_VOLTAGE_CHANNEL(2, "CH2_V"), PMC_ADC_VOLTAGE_CHANNEL(3, "CH3_V"), PMC_ADC_VOLTAGE_CHANNEL(4, "CH4_V"), PMC_ADC_VOLTAGE_CHANNEL(5, "CH5_V"), PMC_ADC_VOLTAGE_CHANNEL(6, "CH6_V"), PMC_ADC_VOLTAGE_CHANNEL(7, "CH7_V"), PMC_ADC_VOLTAGE_CHANNEL(8, "CH8_V"), PMC_ADC_VOLTAGE_CHANNEL(9, "CH9_V"), PMC_ADC_VOLTAGE_CHANNEL(10, "CH10_V"), PMC_ADC_VOLTAGE_CHANNEL(11, "CH11_V"), PMC_ADC_VOLTAGE_CHANNEL(12, "CH12_V"), PMC_ADC_VOLTAGE_CHANNEL(13, "CH13_V"), PMC_ADC_VOLTAGE_CHANNEL(14, "CH14_V"), PMC_ADC_VOLTAGE_CHANNEL(15, "CH15_V"), PMC_ADC_CURRENT_CHANNEL(0, "CH0_I"), PMC_ADC_CURRENT_CHANNEL(1, "CH1_I"), PMC_ADC_CURRENT_CHANNEL(2, "CH2_I"), PMC_ADC_CURRENT_CHANNEL(3, "CH3_I"), PMC_ADC_CURRENT_CHANNEL(4, "CH4_I"), PMC_ADC_CURRENT_CHANNEL(5, "CH5_I"), PMC_ADC_CURRENT_CHANNEL(6, "CH6_I"), PMC_ADC_CURRENT_CHANNEL(7, "CH7_I"), PMC_ADC_CURRENT_CHANNEL(8, "CH8_I"), PMC_ADC_CURRENT_CHANNEL(9, "CH9_I"), PMC_ADC_CURRENT_CHANNEL(10, "CH10_I"), PMC_ADC_CURRENT_CHANNEL(11, "CH11_I"), PMC_ADC_CURRENT_CHANNEL(12, "CH12_I"), PMC_ADC_CURRENT_CHANNEL(13, "CH13_I"), PMC_ADC_CURRENT_CHANNEL(14, "CH14_I"), PMC_ADC_CURRENT_CHANNEL(15, "CH15_I"), }; static int pmc_adc_read_raw_ch(struct pmc_adc *pmc_adc, u8 cmd, int *val) { s32 ret; ret = i2c_smbus_read_word_swapped(pmc_adc->client, cmd); if (ret < 0) { dev_err(&pmc_adc->client->dev, "i2c read word failed (%d)\n", ret); return ret; } *val = sign_extend32(ret, 15); return 0; } static int pmc_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct pmc_adc *pmc_adc = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_PROCESSED: /* Values are directly read in mV or mA */ ret = pmc_adc_read_raw_ch(pmc_adc, chan->address, val); if (ret) return ret; return IIO_VAL_INT; } return -EINVAL; } static int pmc_adc_fwnode_xlate(struct iio_dev *indio_dev, const struct fwnode_reference_args *iiospec) { enum iio_chan_type expected_type; unsigned int i; /* * args[0]: Acquisition type (i.e. voltage or current) * args[1]: PMC ADC channel number */ if (iiospec->nargs != 2) return -EINVAL; switch (iiospec->args[0]) { case GEHC_PMC_ADC_VOLTAGE: expected_type = IIO_VOLTAGE; break; case GEHC_PMC_ADC_CURRENT: expected_type = IIO_CURRENT; break; default: dev_err(&indio_dev->dev, "Invalid channel type %llu\n", iiospec->args[0]); return -EINVAL; } for (i = 0; i < indio_dev->num_channels; i++) if (indio_dev->channels[i].type == expected_type && indio_dev->channels[i].channel == iiospec->args[1]) return i; dev_err(&indio_dev->dev, "Invalid channel type %llu number %llu\n", iiospec->args[0], iiospec->args[1]); return -EINVAL; } static const struct iio_info pmc_adc_info = { .read_raw = pmc_adc_read_raw, .fwnode_xlate = pmc_adc_fwnode_xlate, }; static const char *const pmc_adc_regulator_names[] = { "vdd", "vdda", "vddio", "vref", }; static int pmc_adc_probe(struct i2c_client *client) { struct iio_dev *indio_dev; struct pmc_adc *pmc_adc; struct clk *clk; s32 val; int ret; ret = devm_regulator_bulk_get_enable(&client->dev, ARRAY_SIZE(pmc_adc_regulator_names), pmc_adc_regulator_names); if (ret) return dev_err_probe(&client->dev, ret, "Failed to get regulators\n"); clk = devm_clk_get_optional_enabled(&client->dev, "osc"); if (IS_ERR(clk)) return dev_err_probe(&client->dev, PTR_ERR(clk), "Failed to get osc clock\n"); indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*pmc_adc)); if (!indio_dev) return -ENOMEM; pmc_adc = iio_priv(indio_dev); pmc_adc->client = client; val = i2c_smbus_read_byte_data(pmc_adc->client, PMC_ADC_CMD_REQUEST_PROTOCOL_VERSION); if (val < 0) return dev_err_probe(&client->dev, val, "Failed to get protocol version\n"); if (val != 0x01) return dev_err_probe(&client->dev, -EINVAL, "Unsupported protocol version 0x%02x\n", val); indio_dev->name = "pmc_adc"; indio_dev->info = &pmc_adc_info; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = pmc_adc_channels; indio_dev->num_channels = ARRAY_SIZE(pmc_adc_channels); return devm_iio_device_register(&client->dev, indio_dev); } static const struct of_device_id pmc_adc_of_match[] = { { .compatible = "gehc,pmc-adc"}, { } }; MODULE_DEVICE_TABLE(of, pmc_adc_of_match); static const struct i2c_device_id pmc_adc_id_table[] = { { "pmc-adc" }, { } }; MODULE_DEVICE_TABLE(i2c, pmc_adc_id_table); static struct i2c_driver pmc_adc_i2c_driver = { .driver = { .name = "pmc-adc", .of_match_table = pmc_adc_of_match, }, .id_table = pmc_adc_id_table, .probe = pmc_adc_probe, }; module_i2c_driver(pmc_adc_i2c_driver); MODULE_AUTHOR("Herve Codina "); MODULE_DESCRIPTION("GE HealthCare PMC ADC driver"); MODULE_LICENSE("GPL");