--- /dev/null
+// 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 <herve.codina@bootlin.com>
+ */
+#include <dt-bindings/iio/adc/gehc,pmc-adc.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+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 <herve.codina@bootlin.com>");
+MODULE_DESCRIPTION("GE HealthCare PMC ADC driver");
+MODULE_LICENSE("GPL");
projects / linux-block.git / commitdiff