Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 338 insertions, 0 deletions

diff --git a/drivers/hwmon/powr1220.c b/drivers/hwmon/powr1220.c
new file mode 100644
index 000000000..f77dc6db3
--- /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 *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_new	= powr1220_probe,
+	.id_table	= powr1220_ids,
+};
+
+module_i2c_driver(powr1220_driver);
+
+MODULE_AUTHOR("Scott Kanowitz");
+MODULE_DESCRIPTION("POWR1220 driver");
+MODULE_LICENSE("GPL");