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-rw-r--r--drivers/hwmon/powr1220.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/drivers/hwmon/powr1220.c b/drivers/hwmon/powr1220.c
new file mode 100644
index 0000000000..4120cadb00
--- /dev/null
+++ b/drivers/hwmon/powr1220.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * powr1220.c - Driver for the Lattice POWR1220 programmable power supply
+ * and monitor. Users can read all ADC inputs along with their labels
+ * using the sysfs nodes.
+ *
+ * Copyright (c) 2014 Echo360 https://www.echo360.com
+ * Scott Kanowitz <skanowitz@echo360.com> <scott.kanowitz@gmail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+
+#define ADC_STEP_MV 2
+#define ADC_MAX_LOW_MEASUREMENT_MV 2000
+
+enum powr1xxx_chips { powr1014, powr1220 };
+
+enum powr1220_regs {
+ VMON_STATUS0,
+ VMON_STATUS1,
+ VMON_STATUS2,
+ OUTPUT_STATUS0,
+ OUTPUT_STATUS1,
+ OUTPUT_STATUS2,
+ INPUT_STATUS,
+ ADC_VALUE_LOW,
+ ADC_VALUE_HIGH,
+ ADC_MUX,
+ UES_BYTE0,
+ UES_BYTE1,
+ UES_BYTE2,
+ UES_BYTE3,
+ GP_OUTPUT1,
+ GP_OUTPUT2,
+ GP_OUTPUT3,
+ INPUT_VALUE,
+ RESET,
+ TRIM1_TRIM,
+ TRIM2_TRIM,
+ TRIM3_TRIM,
+ TRIM4_TRIM,
+ TRIM5_TRIM,
+ TRIM6_TRIM,
+ TRIM7_TRIM,
+ TRIM8_TRIM,
+ MAX_POWR1220_REGS
+};
+
+enum powr1220_adc_values {
+ VMON1,
+ VMON2,
+ VMON3,
+ VMON4,
+ VMON5,
+ VMON6,
+ VMON7,
+ VMON8,
+ VMON9,
+ VMON10,
+ VMON11,
+ VMON12,
+ VCCA,
+ VCCINP,
+ MAX_POWR1220_ADC_VALUES
+};
+
+struct powr1220_data {
+ struct i2c_client *client;
+ struct mutex update_lock;
+ u8 max_channels;
+ bool adc_valid[MAX_POWR1220_ADC_VALUES];
+ /* the next value is in jiffies */
+ unsigned long adc_last_updated[MAX_POWR1220_ADC_VALUES];
+
+ /* values */
+ int adc_maxes[MAX_POWR1220_ADC_VALUES];
+ int adc_values[MAX_POWR1220_ADC_VALUES];
+};
+
+static const char * const input_names[] = {
+ [VMON1] = "vmon1",
+ [VMON2] = "vmon2",
+ [VMON3] = "vmon3",
+ [VMON4] = "vmon4",
+ [VMON5] = "vmon5",
+ [VMON6] = "vmon6",
+ [VMON7] = "vmon7",
+ [VMON8] = "vmon8",
+ [VMON9] = "vmon9",
+ [VMON10] = "vmon10",
+ [VMON11] = "vmon11",
+ [VMON12] = "vmon12",
+ [VCCA] = "vcca",
+ [VCCINP] = "vccinp",
+};
+
+/* Reads the specified ADC channel */
+static int powr1220_read_adc(struct device *dev, int ch_num)
+{
+ struct powr1220_data *data = dev_get_drvdata(dev);
+ int reading;
+ int result;
+ int adc_range = 0;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||
+ !data->adc_valid[ch_num]) {
+ /*
+ * figure out if we need to use the attenuator for
+ * high inputs or inputs that we don't yet have a measurement
+ * for. We dynamically set the attenuator depending on the
+ * max reading.
+ */
+ if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||
+ data->adc_maxes[ch_num] == 0)
+ adc_range = 1 << 4;
+
+ /* set the attenuator and mux */
+ result = i2c_smbus_write_byte_data(data->client, ADC_MUX,
+ adc_range | ch_num);
+ if (result)
+ goto exit;
+
+ /*
+ * wait at least Tconvert time (200 us) for the
+ * conversion to complete
+ */
+ udelay(200);
+
+ /* get the ADC reading */
+ result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);
+ if (result < 0)
+ goto exit;
+
+ reading = result >> 4;
+
+ /* get the upper half of the reading */
+ result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);
+ if (result < 0)
+ goto exit;
+
+ reading |= result << 4;
+
+ /* now convert the reading to a voltage */
+ reading *= ADC_STEP_MV;
+ data->adc_values[ch_num] = reading;
+ data->adc_valid[ch_num] = true;
+ data->adc_last_updated[ch_num] = jiffies;
+ result = reading;
+
+ if (reading > data->adc_maxes[ch_num])
+ data->adc_maxes[ch_num] = reading;
+ } else {
+ result = data->adc_values[ch_num];
+ }
+
+exit:
+ mutex_unlock(&data->update_lock);
+
+ return result;
+}
+
+static umode_t
+powr1220_is_visible(const void *data, enum hwmon_sensor_types type, u32
+ attr, int channel)
+{
+ struct powr1220_data *chip_data = (struct powr1220_data *)data;
+
+ if (channel >= chip_data->max_channels)
+ return 0;
+
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ case hwmon_in_highest:
+ case hwmon_in_label:
+ return 0444;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int
+powr1220_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+ int channel, const char **str)
+{
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_label:
+ *str = input_names[channel];
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+static int
+powr1220_read(struct device *dev, enum hwmon_sensor_types type, u32
+ attr, int channel, long *val)
+{
+ struct powr1220_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ ret = powr1220_read_adc(dev, channel);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ break;
+ case hwmon_in_highest:
+ *val = data->adc_maxes[channel];
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+}
+
+ return 0;
+}
+
+static const struct hwmon_channel_info * const powr1220_info[] = {
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL),
+
+ NULL
+};
+
+static const struct hwmon_ops powr1220_hwmon_ops = {
+ .read = powr1220_read,
+ .read_string = powr1220_read_string,
+ .is_visible = powr1220_is_visible,
+};
+
+static const struct hwmon_chip_info powr1220_chip_info = {
+ .ops = &powr1220_hwmon_ops,
+ .info = powr1220_info,
+};
+
+static const struct i2c_device_id powr1220_ids[];
+
+static int powr1220_probe(struct i2c_client *client)
+{
+ struct powr1220_data *data;
+ struct device *hwmon_dev;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ switch (i2c_match_id(powr1220_ids, client)->driver_data) {
+ case powr1014:
+ data->max_channels = 10;
+ break;
+ default:
+ data->max_channels = 12;
+ break;
+ }
+
+ mutex_init(&data->update_lock);
+ data->client = client;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
+ client->name,
+ data,
+ &powr1220_chip_info,
+ NULL);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id powr1220_ids[] = {
+ { "powr1014", powr1014, },
+ { "powr1220", powr1220, },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, powr1220_ids);
+
+static struct i2c_driver powr1220_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "powr1220",
+ },
+ .probe = powr1220_probe,
+ .id_table = powr1220_ids,
+};
+
+module_i2c_driver(powr1220_driver);
+
+MODULE_AUTHOR("Scott Kanowitz");
+MODULE_DESCRIPTION("POWR1220 driver");
+MODULE_LICENSE("GPL");