Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 481 insertions, 0 deletions

diff --git a/drivers/hwmon/lm95241.c b/drivers/hwmon/lm95241.c
new file mode 100644
index 0000000000..475551f502
--- /dev/null
+++ b/drivers/hwmon/lm95241.c
@@ -0,0 +1,481 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
+ *
+ * The LM95241 is a sensor chip made by National Semiconductors.
+ * It reports up to three temperatures (its own plus up to two external ones).
+ * Complete datasheet can be obtained from National's website at:
+ *   http://www.national.com/ds.cgi/LM/LM95241.pdf
+ */
+
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#define DEVNAME "lm95241"
+
+static const unsigned short normal_i2c[] = {
+	0x19, 0x2a, 0x2b, I2C_CLIENT_END };
+
+/* LM95241 registers */
+#define LM95241_REG_R_MAN_ID		0xFE
+#define LM95241_REG_R_CHIP_ID		0xFF
+#define LM95241_REG_R_STATUS		0x02
+#define LM95241_REG_RW_CONFIG		0x03
+#define LM95241_REG_RW_REM_FILTER	0x06
+#define LM95241_REG_RW_TRUTHERM		0x07
+#define LM95241_REG_W_ONE_SHOT		0x0F
+#define LM95241_REG_R_LOCAL_TEMPH	0x10
+#define LM95241_REG_R_REMOTE1_TEMPH	0x11
+#define LM95241_REG_R_REMOTE2_TEMPH	0x12
+#define LM95241_REG_R_LOCAL_TEMPL	0x20
+#define LM95241_REG_R_REMOTE1_TEMPL	0x21
+#define LM95241_REG_R_REMOTE2_TEMPL	0x22
+#define LM95241_REG_RW_REMOTE_MODEL	0x30
+
+/* LM95241 specific bitfields */
+#define CFG_STOP	BIT(6)
+#define CFG_CR0076	0x00
+#define CFG_CR0182	BIT(4)
+#define CFG_CR1000	BIT(5)
+#define CFG_CR2700	(BIT(4) | BIT(5))
+#define CFG_CRMASK	(BIT(4) | BIT(5))
+#define R1MS_MASK	BIT(0)
+#define R2MS_MASK	BIT(2)
+#define R1DF_MASK	BIT(1)
+#define R2DF_MASK	BIT(2)
+#define R1FE_MASK	BIT(0)
+#define R2FE_MASK	BIT(2)
+#define R1DM		BIT(0)
+#define R2DM		BIT(1)
+#define TT1_SHIFT	0
+#define TT2_SHIFT	4
+#define TT_OFF		0
+#define TT_ON		1
+#define TT_MASK		7
+#define NATSEMI_MAN_ID	0x01
+#define LM95231_CHIP_ID	0xA1
+#define LM95241_CHIP_ID	0xA4
+
+static const u8 lm95241_reg_address[] = {
+	LM95241_REG_R_LOCAL_TEMPH,
+	LM95241_REG_R_LOCAL_TEMPL,
+	LM95241_REG_R_REMOTE1_TEMPH,
+	LM95241_REG_R_REMOTE1_TEMPL,
+	LM95241_REG_R_REMOTE2_TEMPH,
+	LM95241_REG_R_REMOTE2_TEMPL
+};
+
+/* Client data (each client gets its own) */
+struct lm95241_data {
+	struct i2c_client *client;
+	struct mutex update_lock;
+	unsigned long last_updated;	/* in jiffies */
+	unsigned long interval;		/* in milli-seconds */
+	bool valid;		/* false until following fields are valid */
+	/* registers values */
+	u8 temp[ARRAY_SIZE(lm95241_reg_address)];
+	u8 status, config, model, trutherm;
+};
+
+/* Conversions */
+static int temp_from_reg_signed(u8 val_h, u8 val_l)
+{
+	s16 val_hl = (val_h << 8) | val_l;
+	return val_hl * 1000 / 256;
+}
+
+static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
+{
+	u16 val_hl = (val_h << 8) | val_l;
+	return val_hl * 1000 / 256;
+}
+
+static struct lm95241_data *lm95241_update_device(struct device *dev)
+{
+	struct lm95241_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+
+	mutex_lock(&data->update_lock);
+
+	if (time_after(jiffies, data->last_updated
+		       + msecs_to_jiffies(data->interval)) ||
+	    !data->valid) {
+		int i;
+
+		dev_dbg(dev, "Updating lm95241 data.\n");
+		for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
+			data->temp[i]
+			  = i2c_smbus_read_byte_data(client,
+						     lm95241_reg_address[i]);
+
+		data->status = i2c_smbus_read_byte_data(client,
+							LM95241_REG_R_STATUS);
+		data->last_updated = jiffies;
+		data->valid = true;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+static int lm95241_read_chip(struct device *dev, u32 attr, int channel,
+			     long *val)
+{
+	struct lm95241_data *data = dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_chip_update_interval:
+		*val = data->interval;
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int lm95241_read_temp(struct device *dev, u32 attr, int channel,
+			     long *val)
+{
+	struct lm95241_data *data = lm95241_update_device(dev);
+
+	switch (attr) {
+	case hwmon_temp_input:
+		if (!channel || (data->config & BIT(channel - 1)))
+			*val = temp_from_reg_signed(data->temp[channel * 2],
+						data->temp[channel * 2 + 1]);
+		else
+			*val = temp_from_reg_unsigned(data->temp[channel * 2],
+						data->temp[channel * 2 + 1]);
+		return 0;
+	case hwmon_temp_min:
+		if (channel == 1)
+			*val = (data->config & R1DF_MASK) ? -128000 : 0;
+		else
+			*val = (data->config & R2DF_MASK) ? -128000 : 0;
+		return 0;
+	case hwmon_temp_max:
+		if (channel == 1)
+			*val = (data->config & R1DF_MASK) ? 127875 : 255875;
+		else
+			*val = (data->config & R2DF_MASK) ? 127875 : 255875;
+		return 0;
+	case hwmon_temp_type:
+		if (channel == 1)
+			*val = (data->model & R1MS_MASK) ? 1 : 2;
+		else
+			*val = (data->model & R2MS_MASK) ? 1 : 2;
+		return 0;
+	case hwmon_temp_fault:
+		if (channel == 1)
+			*val = !!(data->status & R1DM);
+		else
+			*val = !!(data->status & R2DM);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int lm95241_read(struct device *dev, enum hwmon_sensor_types type,
+			u32 attr, int channel, long *val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return lm95241_read_chip(dev, attr, channel, val);
+	case hwmon_temp:
+		return lm95241_read_temp(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int lm95241_write_chip(struct device *dev, u32 attr, int channel,
+			      long val)
+{
+	struct lm95241_data *data = dev_get_drvdata(dev);
+	int convrate;
+	u8 config;
+	int ret;
+
+	mutex_lock(&data->update_lock);
+
+	switch (attr) {
+	case hwmon_chip_update_interval:
+		config = data->config & ~CFG_CRMASK;
+		if (val < 130) {
+			convrate = 76;
+			config |= CFG_CR0076;
+		} else if (val < 590) {
+			convrate = 182;
+			config |= CFG_CR0182;
+		} else if (val < 1850) {
+			convrate = 1000;
+			config |= CFG_CR1000;
+		} else {
+			convrate = 2700;
+			config |= CFG_CR2700;
+		}
+		data->interval = convrate;
+		data->config = config;
+		ret = i2c_smbus_write_byte_data(data->client,
+						LM95241_REG_RW_CONFIG, config);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+	mutex_unlock(&data->update_lock);
+	return ret;
+}
+
+static int lm95241_write_temp(struct device *dev, u32 attr, int channel,
+			      long val)
+{
+	struct lm95241_data *data = dev_get_drvdata(dev);
+	struct i2c_client *client = data->client;
+	int ret;
+
+	mutex_lock(&data->update_lock);
+
+	switch (attr) {
+	case hwmon_temp_min:
+		if (channel == 1) {
+			if (val < 0)
+				data->config |= R1DF_MASK;
+			else
+				data->config &= ~R1DF_MASK;
+		} else {
+			if (val < 0)
+				data->config |= R2DF_MASK;
+			else
+				data->config &= ~R2DF_MASK;
+		}
+		data->valid = false;
+		ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
+						data->config);
+		break;
+	case hwmon_temp_max:
+		if (channel == 1) {
+			if (val <= 127875)
+				data->config |= R1DF_MASK;
+			else
+				data->config &= ~R1DF_MASK;
+		} else {
+			if (val <= 127875)
+				data->config |= R2DF_MASK;
+			else
+				data->config &= ~R2DF_MASK;
+		}
+		data->valid = false;
+		ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
+						data->config);
+		break;
+	case hwmon_temp_type:
+		if (val != 1 && val != 2) {
+			ret = -EINVAL;
+			break;
+		}
+		if (channel == 1) {
+			data->trutherm &= ~(TT_MASK << TT1_SHIFT);
+			if (val == 1) {
+				data->model |= R1MS_MASK;
+				data->trutherm |= (TT_ON << TT1_SHIFT);
+			} else {
+				data->model &= ~R1MS_MASK;
+				data->trutherm |= (TT_OFF << TT1_SHIFT);
+			}
+		} else {
+			data->trutherm &= ~(TT_MASK << TT2_SHIFT);
+			if (val == 1) {
+				data->model |= R2MS_MASK;
+				data->trutherm |= (TT_ON << TT2_SHIFT);
+			} else {
+				data->model &= ~R2MS_MASK;
+				data->trutherm |= (TT_OFF << TT2_SHIFT);
+			}
+		}
+		ret = i2c_smbus_write_byte_data(client,
+						LM95241_REG_RW_REMOTE_MODEL,
+						data->model);
+		if (ret < 0)
+			break;
+		ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+						data->trutherm);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+static int lm95241_write(struct device *dev, enum hwmon_sensor_types type,
+			 u32 attr, int channel, long val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return lm95241_write_chip(dev, attr, channel, val);
+	case hwmon_temp:
+		return lm95241_write_temp(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t lm95241_is_visible(const void *data,
+				  enum hwmon_sensor_types type,
+				  u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_update_interval:
+			return 0644;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			return 0444;
+		case hwmon_temp_fault:
+			return 0444;
+		case hwmon_temp_min:
+		case hwmon_temp_max:
+		case hwmon_temp_type:
+			return 0644;
+		}
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm95241_detect(struct i2c_client *new_client,
+			  struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = new_client->adapter;
+	const char *name;
+	int mfg_id, chip_id;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
+	if (mfg_id != NATSEMI_MAN_ID)
+		return -ENODEV;
+
+	chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
+	switch (chip_id) {
+	case LM95231_CHIP_ID:
+		name = "lm95231";
+		break;
+	case LM95241_CHIP_ID:
+		name = "lm95241";
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	/* Fill the i2c board info */
+	strscpy(info->type, name, I2C_NAME_SIZE);
+	return 0;
+}
+
+static void lm95241_init_client(struct i2c_client *client,
+				struct lm95241_data *data)
+{
+	data->interval = 1000;
+	data->config = CFG_CR1000;
+	data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
+
+	i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
+				  R1FE_MASK | R2FE_MASK);
+	i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+				  data->trutherm);
+	i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
+				  data->model);
+}
+
+static const struct hwmon_channel_info * const lm95241_info[] = {
+	HWMON_CHANNEL_INFO(chip,
+			   HWMON_C_UPDATE_INTERVAL),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
+			   HWMON_T_TYPE | HWMON_T_FAULT,
+			   HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
+			   HWMON_T_TYPE | HWMON_T_FAULT),
+	NULL
+};
+
+static const struct hwmon_ops lm95241_hwmon_ops = {
+	.is_visible = lm95241_is_visible,
+	.read = lm95241_read,
+	.write = lm95241_write,
+};
+
+static const struct hwmon_chip_info lm95241_chip_info = {
+	.ops = &lm95241_hwmon_ops,
+	.info = lm95241_info,
+};
+
+static int lm95241_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct lm95241_data *data;
+	struct device *hwmon_dev;
+
+	data = devm_kzalloc(dev, sizeof(struct lm95241_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	mutex_init(&data->update_lock);
+
+	/* Initialize the LM95241 chip */
+	lm95241_init_client(client, data);
+
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+							   data,
+							   &lm95241_chip_info,
+							   NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+/* Driver data (common to all clients) */
+static const struct i2c_device_id lm95241_id[] = {
+	{ "lm95231", 0 },
+	{ "lm95241", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lm95241_id);
+
+static struct i2c_driver lm95241_driver = {
+	.class		= I2C_CLASS_HWMON,
+	.driver = {
+		.name	= DEVNAME,
+	},
+	.probe		= lm95241_probe,
+	.id_table	= lm95241_id,
+	.detect		= lm95241_detect,
+	.address_list	= normal_i2c,
+};
+
+module_i2c_driver(lm95241_driver);
+
+MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
+MODULE_DESCRIPTION("LM95231/LM95241 sensor driver");
+MODULE_LICENSE("GPL");