Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 467 insertions, 0 deletions

diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c
new file mode 100644
index 0000000000..5befedca6a
--- /dev/null
+++ b/drivers/hwmon/lm83.c
@@ -0,0 +1,467 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
+ *          monitoring
+ * Copyright (C) 2003-2009  Jean Delvare <jdelvare@suse.de>
+ *
+ * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
+ * a sensor chip made by National Semiconductor. It reports up to four
+ * temperatures (its own plus up to three external ones) with a 1 deg
+ * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
+ * from National's website at:
+ *   http://www.national.com/pf/LM/LM83.html
+ * Since the datasheet omits to give the chip stepping code, I give it
+ * here: 0x03 (at register 0xff).
+ *
+ * Also supports the LM82 temp sensor, which is basically a stripped down
+ * model of the LM83.  Datasheet is here:
+ * http://www.national.com/pf/LM/LM82.html
+ */
+
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/hwmon.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+/*
+ * Addresses to scan
+ * Address is selected using 2 three-level pins, resulting in 9 possible
+ * addresses.
+ */
+
+static const unsigned short normal_i2c[] = {
+	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
+
+enum chips { lm83, lm82 };
+
+/*
+ * The LM83 registers
+ * Manufacturer ID is 0x01 for National Semiconductor.
+ */
+
+#define LM83_REG_R_MAN_ID		0xFE
+#define LM83_REG_R_CHIP_ID		0xFF
+#define LM83_REG_R_CONFIG		0x03
+#define LM83_REG_W_CONFIG		0x09
+#define LM83_REG_R_STATUS1		0x02
+#define LM83_REG_R_STATUS2		0x35
+#define LM83_REG_R_LOCAL_TEMP		0x00
+#define LM83_REG_R_LOCAL_HIGH		0x05
+#define LM83_REG_W_LOCAL_HIGH		0x0B
+#define LM83_REG_R_REMOTE1_TEMP		0x30
+#define LM83_REG_R_REMOTE1_HIGH		0x38
+#define LM83_REG_W_REMOTE1_HIGH		0x50
+#define LM83_REG_R_REMOTE2_TEMP		0x01
+#define LM83_REG_R_REMOTE2_HIGH		0x07
+#define LM83_REG_W_REMOTE2_HIGH		0x0D
+#define LM83_REG_R_REMOTE3_TEMP		0x31
+#define LM83_REG_R_REMOTE3_HIGH		0x3A
+#define LM83_REG_W_REMOTE3_HIGH		0x52
+#define LM83_REG_R_TCRIT		0x42
+#define LM83_REG_W_TCRIT		0x5A
+
+static const u8 LM83_REG_TEMP[] = {
+	LM83_REG_R_LOCAL_TEMP,
+	LM83_REG_R_REMOTE1_TEMP,
+	LM83_REG_R_REMOTE2_TEMP,
+	LM83_REG_R_REMOTE3_TEMP,
+};
+
+static const u8 LM83_REG_MAX[] = {
+	LM83_REG_R_LOCAL_HIGH,
+	LM83_REG_R_REMOTE1_HIGH,
+	LM83_REG_R_REMOTE2_HIGH,
+	LM83_REG_R_REMOTE3_HIGH,
+};
+
+/* alarm and fault registers and bits, indexed by channel */
+static const u8 LM83_ALARM_REG[] = {
+	LM83_REG_R_STATUS1, LM83_REG_R_STATUS2, LM83_REG_R_STATUS1, LM83_REG_R_STATUS2
+};
+
+static const u8 LM83_MAX_ALARM_BIT[] = {
+	BIT(6), BIT(7), BIT(4), BIT(4)
+};
+
+static const u8 LM83_CRIT_ALARM_BIT[] = {
+	BIT(0), BIT(0), BIT(1), BIT(1)
+};
+
+static const u8 LM83_FAULT_BIT[] = {
+	0, BIT(5), BIT(2), BIT(2)
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct lm83_data {
+	struct regmap *regmap;
+	enum chips type;
+};
+
+/* regmap code */
+
+static int lm83_regmap_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct i2c_client *client = context;
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client, reg);
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+	return 0;
+}
+
+/*
+ * The regmap write function maps read register addresses to write register
+ * addresses. This is necessary for regmap register caching to work.
+ * An alternative would be to clear the regmap cache whenever a register is
+ * written, but that would be much more expensive.
+ */
+static int lm83_regmap_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct i2c_client *client = context;
+
+	switch (reg) {
+	case LM83_REG_R_CONFIG:
+	case LM83_REG_R_LOCAL_HIGH:
+	case LM83_REG_R_REMOTE2_HIGH:
+		reg += 0x06;
+		break;
+	case LM83_REG_R_REMOTE1_HIGH:
+	case LM83_REG_R_REMOTE3_HIGH:
+	case LM83_REG_R_TCRIT:
+		reg += 0x18;
+		break;
+	default:
+		break;
+	}
+
+	return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static bool lm83_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case LM83_REG_R_LOCAL_TEMP:
+	case LM83_REG_R_REMOTE1_TEMP:
+	case LM83_REG_R_REMOTE2_TEMP:
+	case LM83_REG_R_REMOTE3_TEMP:
+	case LM83_REG_R_STATUS1:
+	case LM83_REG_R_STATUS2:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config lm83_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = lm83_regmap_is_volatile,
+	.reg_read = lm83_regmap_reg_read,
+	.reg_write = lm83_regmap_reg_write,
+};
+
+/* hwmon API */
+
+static int lm83_temp_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct lm83_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		err = regmap_read(data->regmap, LM83_REG_TEMP[channel], &regval);
+		if (err < 0)
+			return err;
+		*val = (s8)regval * 1000;
+		break;
+	case hwmon_temp_max:
+		err = regmap_read(data->regmap, LM83_REG_MAX[channel], &regval);
+		if (err < 0)
+			return err;
+		*val = (s8)regval * 1000;
+		break;
+	case hwmon_temp_crit:
+		err = regmap_read(data->regmap, LM83_REG_R_TCRIT, &regval);
+		if (err < 0)
+			return err;
+		*val = (s8)regval * 1000;
+		break;
+	case hwmon_temp_max_alarm:
+		err = regmap_read(data->regmap, LM83_ALARM_REG[channel], &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & LM83_MAX_ALARM_BIT[channel]);
+		break;
+	case hwmon_temp_crit_alarm:
+		err = regmap_read(data->regmap, LM83_ALARM_REG[channel], &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & LM83_CRIT_ALARM_BIT[channel]);
+		break;
+	case hwmon_temp_fault:
+		err = regmap_read(data->regmap, LM83_ALARM_REG[channel], &regval);
+		if (err < 0)
+			return err;
+		*val = !!(regval & LM83_FAULT_BIT[channel]);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int lm83_temp_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct lm83_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	regval = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
+
+	switch (attr) {
+	case hwmon_temp_max:
+		err = regmap_write(data->regmap, LM83_REG_MAX[channel], regval);
+		if (err < 0)
+			return err;
+		break;
+	case hwmon_temp_crit:
+		err = regmap_write(data->regmap, LM83_REG_R_TCRIT, regval);
+		if (err < 0)
+			return err;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+	return 0;
+}
+
+static int lm83_chip_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct lm83_data *data = dev_get_drvdata(dev);
+	unsigned int regval;
+	int err;
+
+	switch (attr) {
+	case hwmon_chip_alarms:
+		err = regmap_read(data->regmap, LM83_REG_R_STATUS1, &regval);
+		if (err < 0)
+			return err;
+		*val = regval;
+		err = regmap_read(data->regmap, LM83_REG_R_STATUS2, &regval);
+		if (err < 0)
+			return err;
+		*val |= regval << 8;
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int lm83_read(struct device *dev, enum hwmon_sensor_types type,
+		     u32 attr, int channel, long *val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return lm83_chip_read(dev, attr, channel, val);
+	case hwmon_temp:
+		return lm83_temp_read(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int lm83_write(struct device *dev, enum hwmon_sensor_types type,
+		      u32 attr, int channel, long val)
+{
+	switch (type) {
+	case hwmon_temp:
+		return lm83_temp_write(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t lm83_is_visible(const void *_data, enum hwmon_sensor_types type,
+			       u32 attr, int channel)
+{
+	const struct lm83_data *data = _data;
+
+	/*
+	 * LM82 only supports a single external channel, modeled as channel 2.
+	 */
+	if (data->type == lm82 && (channel == 1 || channel == 3))
+		return 0;
+
+	switch (type) {
+	case hwmon_chip:
+		if (attr == hwmon_chip_alarms)
+			return 0444;
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+		case hwmon_temp_max_alarm:
+		case hwmon_temp_crit_alarm:
+			return 0444;
+		case hwmon_temp_fault:
+			if (channel)
+				return 0444;
+			break;
+		case hwmon_temp_max:
+			return 0644;
+		case hwmon_temp_crit:
+			if (channel == 2)
+				return 0644;
+			return 0444;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+static const struct hwmon_channel_info * const lm83_info[] = {
+	HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
+			   HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT
+			   ),
+	NULL
+};
+
+static const struct hwmon_ops lm83_hwmon_ops = {
+	.is_visible = lm83_is_visible,
+	.read = lm83_read,
+	.write = lm83_write,
+};
+
+static const struct hwmon_chip_info lm83_chip_info = {
+	.ops = &lm83_hwmon_ops,
+	.info = lm83_info,
+};
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm83_detect(struct i2c_client *client,
+		       struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	const char *name;
+	u8 man_id, chip_id;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	/* Detection */
+	if ((i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) & 0xA8) ||
+	    (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) & 0x48) ||
+	    (i2c_smbus_read_byte_data(client, LM83_REG_R_CONFIG) & 0x41)) {
+		dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
+			client->addr);
+		return -ENODEV;
+	}
+
+	/* Identification */
+	man_id = i2c_smbus_read_byte_data(client, LM83_REG_R_MAN_ID);
+	if (man_id != 0x01)	/* National Semiconductor */
+		return -ENODEV;
+
+	chip_id = i2c_smbus_read_byte_data(client, LM83_REG_R_CHIP_ID);
+	switch (chip_id) {
+	case 0x03:
+		/*
+		 * According to the LM82 datasheet dated March 2013, recent
+		 * revisions of LM82 have a die revision of 0x03. This was
+		 * confirmed with a real chip. Further details in this revision
+		 * of the LM82 datasheet strongly suggest that LM82 is just a
+		 * repackaged LM83. It is therefore impossible to distinguish
+		 * those chips from LM83, and they will be misdetected as LM83.
+		 */
+		name = "lm83";
+		break;
+	case 0x01:
+		name = "lm82";
+		break;
+	default:
+		/* identification failed */
+		dev_dbg(&adapter->dev,
+			"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
+			man_id, chip_id);
+		return -ENODEV;
+	}
+
+	strscpy(info->type, name, I2C_NAME_SIZE);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm83_id[] = {
+	{ "lm83", lm83 },
+	{ "lm82", lm82 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lm83_id);
+
+static int lm83_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct device *hwmon_dev;
+	struct lm83_data *data;
+
+	data = devm_kzalloc(dev, sizeof(struct lm83_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->regmap = devm_regmap_init(dev, NULL, client, &lm83_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	data->type = i2c_match_id(lm83_id, client)->driver_data;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							 data, &lm83_chip_info, NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static struct i2c_driver lm83_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= "lm83",
+	},
+	.probe		= lm83_probe,
+	.id_table	= lm83_id,
+	.detect		= lm83_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(lm83_driver);
+
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
+MODULE_DESCRIPTION("LM83 driver");
+MODULE_LICENSE("GPL");