Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 208 insertions, 0 deletions

diff --git a/drivers/hwmon/mcp3021.c b/drivers/hwmon/mcp3021.c
new file mode 100644
index 0000000000..9814eaf245
--- /dev/null
+++ b/drivers/hwmon/mcp3021.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * mcp3021.c - driver for Microchip MCP3021 and MCP3221
+ *
+ * Copyright (C) 2008-2009, 2012 Freescale Semiconductor, Inc.
+ * Author: Mingkai Hu <Mingkai.hu@freescale.com>
+ * Reworked by Sven Schuchmann <schuchmann@schleissheimer.de>
+ * DT support added by Clemens Gruber <clemens.gruber@pqgruber.com>
+ *
+ * This driver exports the value of analog input voltage to sysfs, the
+ * voltage unit is mV. Through the sysfs interface, lm-sensors tool
+ * can also display the input voltage.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hwmon.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/of.h>
+
+/* Vdd / reference voltage in millivolt */
+#define MCP3021_VDD_REF_MAX	5500
+#define MCP3021_VDD_REF_MIN	2700
+#define MCP3021_VDD_REF_DEFAULT	3300
+
+/* output format */
+#define MCP3021_SAR_SHIFT	2
+#define MCP3021_SAR_MASK	0x3ff
+#define MCP3021_OUTPUT_RES	10	/* 10-bit resolution */
+
+#define MCP3221_SAR_SHIFT	0
+#define MCP3221_SAR_MASK	0xfff
+#define MCP3221_OUTPUT_RES	12	/* 12-bit resolution */
+
+enum chips {
+	mcp3021,
+	mcp3221
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+struct mcp3021_data {
+	struct i2c_client *client;
+	u32 vdd;        /* supply and reference voltage in millivolt */
+	u16 sar_shift;
+	u16 sar_mask;
+	u8 output_res;
+};
+
+static inline u16 volts_from_reg(struct mcp3021_data *data, u16 val)
+{
+	return DIV_ROUND_CLOSEST(data->vdd * val, 1 << data->output_res);
+}
+
+static int mcp3021_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	struct mcp3021_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	__be16 buf;
+	u16 reg;
+	int ret;
+
+	if (type != hwmon_in)
+		return -EOPNOTSUPP;
+
+	ret = i2c_master_recv(client, (char *)&buf, 2);
+	if (ret < 0)
+		return ret;
+	if (ret != 2)
+		return -EIO;
+
+	/* The output code of the MCP3021 is transmitted with MSB first. */
+	reg = be16_to_cpu(buf);
+
+	/*
+	 * The ten-bit output code is composed of the lower 4-bit of the
+	 * first byte and the upper 6-bit of the second byte.
+	 */
+	reg = (reg >> data->sar_shift) & data->sar_mask;
+
+	*val = volts_from_reg(data, reg);
+
+	return 0;
+}
+
+static umode_t mcp3021_is_visible(const void *_data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	if (type != hwmon_in)
+		return 0;
+
+	if (attr != hwmon_in_input)
+		return 0;
+
+	return 0444;
+}
+
+static const struct hwmon_channel_info * const mcp3021_info[] = {
+	HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
+	NULL
+};
+
+static const struct hwmon_ops mcp3021_hwmon_ops = {
+	.is_visible = mcp3021_is_visible,
+	.read = mcp3021_read,
+};
+
+static const struct hwmon_chip_info mcp3021_chip_info = {
+	.ops = &mcp3021_hwmon_ops,
+	.info = mcp3021_info,
+};
+
+static const struct i2c_device_id mcp3021_id[];
+
+static int mcp3021_probe(struct i2c_client *client)
+{
+	struct mcp3021_data *data = NULL;
+	struct device_node *np = client->dev.of_node;
+	struct device *hwmon_dev;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+		return -ENODEV;
+
+	data = devm_kzalloc(&client->dev, sizeof(struct mcp3021_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, data);
+
+	if (np) {
+		if (!of_property_read_u32(np, "reference-voltage-microvolt",
+					  &data->vdd))
+			data->vdd /= 1000;
+		else
+			data->vdd = MCP3021_VDD_REF_DEFAULT;
+	} else {
+		u32 *pdata = dev_get_platdata(&client->dev);
+
+		if (pdata)
+			data->vdd = *pdata;
+		else
+			data->vdd = MCP3021_VDD_REF_DEFAULT;
+	}
+
+	switch (i2c_match_id(mcp3021_id, client)->driver_data) {
+	case mcp3021:
+		data->sar_shift = MCP3021_SAR_SHIFT;
+		data->sar_mask = MCP3021_SAR_MASK;
+		data->output_res = MCP3021_OUTPUT_RES;
+		break;
+
+	case mcp3221:
+		data->sar_shift = MCP3221_SAR_SHIFT;
+		data->sar_mask = MCP3221_SAR_MASK;
+		data->output_res = MCP3221_OUTPUT_RES;
+		break;
+	}
+
+	data->client = client;
+
+	if (data->vdd > MCP3021_VDD_REF_MAX || data->vdd < MCP3021_VDD_REF_MIN)
+		return -EINVAL;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
+							 client->name,
+							 data,
+							 &mcp3021_chip_info,
+							 NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id mcp3021_id[] = {
+	{ "mcp3021", mcp3021 },
+	{ "mcp3221", mcp3221 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mcp3021_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_mcp3021_match[] = {
+	{ .compatible = "microchip,mcp3021", .data = (void *)mcp3021 },
+	{ .compatible = "microchip,mcp3221", .data = (void *)mcp3221 },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, of_mcp3021_match);
+#endif
+
+static struct i2c_driver mcp3021_driver = {
+	.driver = {
+		.name = "mcp3021",
+		.of_match_table = of_match_ptr(of_mcp3021_match),
+	},
+	.probe = mcp3021_probe,
+	.id_table = mcp3021_id,
+};
+
+module_i2c_driver(mcp3021_driver);
+
+MODULE_AUTHOR("Mingkai Hu <Mingkai.hu@freescale.com>");
+MODULE_DESCRIPTION("Microchip MCP3021/MCP3221 driver");
+MODULE_LICENSE("GPL");