v4.19.13 snapshot.
diff --git a/drivers/hwmon/lm95245.c b/drivers/hwmon/lm95245.c
new file mode 100644
index 0000000..27cb06d
--- /dev/null
+++ b/drivers/hwmon/lm95245.c
@@ -0,0 +1,648 @@
+/*
+ * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
+ *
+ * The LM95245 is a sensor chip made by TI / National Semiconductor.
+ * It reports up to two temperatures (its own plus an external one).
+ *
+ * This driver is based on lm95241.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static const unsigned short normal_i2c[] = {
+ 0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
+
+/* LM95245 registers */
+/* general registers */
+#define LM95245_REG_RW_CONFIG1 0x03
+#define LM95245_REG_RW_CONVERS_RATE 0x04
+#define LM95245_REG_W_ONE_SHOT 0x0F
+
+/* diode configuration */
+#define LM95245_REG_RW_CONFIG2 0xBF
+#define LM95245_REG_RW_REMOTE_OFFH 0x11
+#define LM95245_REG_RW_REMOTE_OFFL 0x12
+
+/* status registers */
+#define LM95245_REG_R_STATUS1 0x02
+#define LM95245_REG_R_STATUS2 0x33
+
+/* limit registers */
+#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
+#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
+#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
+#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
+
+/* temperature signed */
+#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
+#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
+#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
+#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
+/* temperature unsigned */
+#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
+#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
+
+/* id registers */
+#define LM95245_REG_R_MAN_ID 0xFE
+#define LM95245_REG_R_CHIP_ID 0xFF
+
+/* LM95245 specific bitfields */
+#define CFG_STOP 0x40
+#define CFG_REMOTE_TCRIT_MASK 0x10
+#define CFG_REMOTE_OS_MASK 0x08
+#define CFG_LOCAL_TCRIT_MASK 0x04
+#define CFG_LOCAL_OS_MASK 0x02
+
+#define CFG2_OS_A0 0x40
+#define CFG2_DIODE_FAULT_OS 0x20
+#define CFG2_DIODE_FAULT_TCRIT 0x10
+#define CFG2_REMOTE_TT 0x08
+#define CFG2_REMOTE_FILTER_DIS 0x00
+#define CFG2_REMOTE_FILTER_EN 0x06
+
+/* conversation rate in ms */
+#define RATE_CR0063 0x00
+#define RATE_CR0364 0x01
+#define RATE_CR1000 0x02
+#define RATE_CR2500 0x03
+
+#define STATUS1_ROS 0x10
+#define STATUS1_DIODE_FAULT 0x04
+#define STATUS1_RTCRIT 0x02
+#define STATUS1_LOC 0x01
+
+#define MANUFACTURER_ID 0x01
+#define LM95235_REVISION 0xB1
+#define LM95245_REVISION 0xB3
+
+static const u8 lm95245_reg_address[] = {
+ LM95245_REG_R_LOCAL_TEMPH_S,
+ LM95245_REG_R_LOCAL_TEMPL_S,
+ LM95245_REG_R_REMOTE_TEMPH_S,
+ LM95245_REG_R_REMOTE_TEMPL_S,
+ LM95245_REG_R_REMOTE_TEMPH_U,
+ LM95245_REG_R_REMOTE_TEMPL_U,
+ LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
+ LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
+ LM95245_REG_RW_COMMON_HYSTERESIS,
+ LM95245_REG_R_STATUS1,
+};
+
+/* Client data (each client gets its own) */
+struct lm95245_data {
+ struct regmap *regmap;
+ struct mutex update_lock;
+ int interval; /* in msecs */
+};
+
+/* Conversions */
+static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
+{
+ return val_h * 1000 + val_l * 1000 / 256;
+}
+
+static int temp_from_reg_signed(u8 val_h, u8 val_l)
+{
+ if (val_h & 0x80)
+ return (val_h - 0x100) * 1000;
+ return temp_from_reg_unsigned(val_h, val_l);
+}
+
+static int lm95245_read_conversion_rate(struct lm95245_data *data)
+{
+ unsigned int rate;
+ int ret;
+
+ ret = regmap_read(data->regmap, LM95245_REG_RW_CONVERS_RATE, &rate);
+ if (ret < 0)
+ return ret;
+
+ switch (rate) {
+ case RATE_CR0063:
+ data->interval = 63;
+ break;
+ case RATE_CR0364:
+ data->interval = 364;
+ break;
+ case RATE_CR1000:
+ data->interval = 1000;
+ break;
+ case RATE_CR2500:
+ default:
+ data->interval = 2500;
+ break;
+ }
+ return 0;
+}
+
+static int lm95245_set_conversion_rate(struct lm95245_data *data, long interval)
+{
+ int ret, rate;
+
+ if (interval <= 63) {
+ interval = 63;
+ rate = RATE_CR0063;
+ } else if (interval <= 364) {
+ interval = 364;
+ rate = RATE_CR0364;
+ } else if (interval <= 1000) {
+ interval = 1000;
+ rate = RATE_CR1000;
+ } else {
+ interval = 2500;
+ rate = RATE_CR2500;
+ }
+
+ ret = regmap_write(data->regmap, LM95245_REG_RW_CONVERS_RATE, rate);
+ if (ret < 0)
+ return ret;
+
+ data->interval = interval;
+ return 0;
+}
+
+static int lm95245_read_temp(struct device *dev, u32 attr, int channel,
+ long *val)
+{
+ struct lm95245_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ int ret, regl, regh, regvall, regvalh;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ regl = channel ? LM95245_REG_R_REMOTE_TEMPL_S :
+ LM95245_REG_R_LOCAL_TEMPL_S;
+ regh = channel ? LM95245_REG_R_REMOTE_TEMPH_S :
+ LM95245_REG_R_LOCAL_TEMPH_S;
+ ret = regmap_read(regmap, regl, ®vall);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(regmap, regh, ®valh);
+ if (ret < 0)
+ return ret;
+ /*
+ * Local temp is always signed.
+ * Remote temp has both signed and unsigned data.
+ * Use signed calculation for remote if signed bit is set
+ * or if reported temperature is below signed limit.
+ */
+ if (!channel || (regvalh & 0x80) || regvalh < 0x7f) {
+ *val = temp_from_reg_signed(regvalh, regvall);
+ return 0;
+ }
+ ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPL_U,
+ ®vall);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPH_U,
+ ®valh);
+ if (ret < 0)
+ return ret;
+ *val = temp_from_reg_unsigned(regvalh, regvall);
+ return 0;
+ case hwmon_temp_max:
+ ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
+ ®valh);
+ if (ret < 0)
+ return ret;
+ *val = regvalh * 1000;
+ return 0;
+ case hwmon_temp_crit:
+ regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
+ LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
+ ret = regmap_read(regmap, regh, ®valh);
+ if (ret < 0)
+ return ret;
+ *val = regvalh * 1000;
+ return 0;
+ case hwmon_temp_max_hyst:
+ ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
+ ®valh);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
+ ®vall);
+ if (ret < 0)
+ return ret;
+ *val = (regvalh - regvall) * 1000;
+ return 0;
+ case hwmon_temp_crit_hyst:
+ regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
+ LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
+ ret = regmap_read(regmap, regh, ®valh);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
+ ®vall);
+ if (ret < 0)
+ return ret;
+ *val = (regvalh - regvall) * 1000;
+ return 0;
+ case hwmon_temp_type:
+ ret = regmap_read(regmap, LM95245_REG_RW_CONFIG2, ®valh);
+ if (ret < 0)
+ return ret;
+ *val = (regvalh & CFG2_REMOTE_TT) ? 1 : 2;
+ return 0;
+ case hwmon_temp_offset:
+ ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFL,
+ ®vall);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFH,
+ ®valh);
+ if (ret < 0)
+ return ret;
+ *val = temp_from_reg_signed(regvalh, regvall);
+ return 0;
+ case hwmon_temp_max_alarm:
+ ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
+ if (ret < 0)
+ return ret;
+ *val = !!(regvalh & STATUS1_ROS);
+ return 0;
+ case hwmon_temp_crit_alarm:
+ ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
+ if (ret < 0)
+ return ret;
+ *val = !!(regvalh & (channel ? STATUS1_RTCRIT : STATUS1_LOC));
+ return 0;
+ case hwmon_temp_fault:
+ ret = regmap_read(regmap, LM95245_REG_R_STATUS1, ®valh);
+ if (ret < 0)
+ return ret;
+ *val = !!(regvalh & STATUS1_DIODE_FAULT);
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int lm95245_write_temp(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct lm95245_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ unsigned int regval;
+ int ret, reg;
+
+ switch (attr) {
+ case hwmon_temp_max:
+ val = clamp_val(val / 1000, 0, 255);
+ ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, val);
+ return ret;
+ case hwmon_temp_crit:
+ reg = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
+ LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
+ val = clamp_val(val / 1000, 0, channel ? 255 : 127);
+ ret = regmap_write(regmap, reg, val);
+ return ret;
+ case hwmon_temp_crit_hyst:
+ mutex_lock(&data->update_lock);
+ ret = regmap_read(regmap, LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
+ ®val);
+ if (ret < 0) {
+ mutex_unlock(&data->update_lock);
+ return ret;
+ }
+ /* Clamp to reasonable range to prevent overflow */
+ val = clamp_val(val, -1000000, 1000000);
+ val = regval - val / 1000;
+ val = clamp_val(val, 0, 31);
+ ret = regmap_write(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
+ val);
+ mutex_unlock(&data->update_lock);
+ return ret;
+ case hwmon_temp_offset:
+ val = clamp_val(val, -128000, 127875);
+ val = val * 256 / 1000;
+ mutex_lock(&data->update_lock);
+ ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFL,
+ val & 0xe0);
+ if (ret < 0) {
+ mutex_unlock(&data->update_lock);
+ return ret;
+ }
+ ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFH,
+ (val >> 8) & 0xff);
+ mutex_unlock(&data->update_lock);
+ return ret;
+ case hwmon_temp_type:
+ if (val != 1 && val != 2)
+ return -EINVAL;
+ ret = regmap_update_bits(regmap, LM95245_REG_RW_CONFIG2,
+ CFG2_REMOTE_TT,
+ val == 1 ? CFG2_REMOTE_TT : 0);
+ return ret;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int lm95245_read_chip(struct device *dev, u32 attr, int channel,
+ long *val)
+{
+ struct lm95245_data *data = dev_get_drvdata(dev);
+
+ switch (attr) {
+ case hwmon_chip_update_interval:
+ *val = data->interval;
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int lm95245_write_chip(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct lm95245_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ switch (attr) {
+ case hwmon_chip_update_interval:
+ mutex_lock(&data->update_lock);
+ ret = lm95245_set_conversion_rate(data, val);
+ mutex_unlock(&data->update_lock);
+ return ret;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int lm95245_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_chip:
+ return lm95245_read_chip(dev, attr, channel, val);
+ case hwmon_temp:
+ return lm95245_read_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int lm95245_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ switch (type) {
+ case hwmon_chip:
+ return lm95245_write_chip(dev, attr, channel, val);
+ case hwmon_temp:
+ return lm95245_write_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t lm95245_temp_is_visible(const void *data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_max_alarm:
+ case hwmon_temp_max_hyst:
+ case hwmon_temp_crit_alarm:
+ case hwmon_temp_fault:
+ return S_IRUGO;
+ case hwmon_temp_type:
+ case hwmon_temp_max:
+ case hwmon_temp_crit:
+ case hwmon_temp_offset:
+ return S_IRUGO | S_IWUSR;
+ case hwmon_temp_crit_hyst:
+ return (channel == 0) ? S_IRUGO | S_IWUSR : S_IRUGO;
+ default:
+ return 0;
+ }
+}
+
+static umode_t lm95245_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 S_IRUGO | S_IWUSR;
+ default:
+ return 0;
+ }
+ case hwmon_temp:
+ return lm95245_temp_is_visible(data, attr, channel);
+ default:
+ return 0;
+ }
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm95245_detect(struct i2c_client *new_client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = new_client->adapter;
+ int address = new_client->addr;
+ const char *name;
+ int rev, id;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
+ if (id != MANUFACTURER_ID)
+ return -ENODEV;
+
+ rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
+ switch (rev) {
+ case LM95235_REVISION:
+ if (address != 0x18 && address != 0x29 && address != 0x4c)
+ return -ENODEV;
+ name = "lm95235";
+ break;
+ case LM95245_REVISION:
+ name = "lm95245";
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ strlcpy(info->type, name, I2C_NAME_SIZE);
+ return 0;
+}
+
+static int lm95245_init_client(struct lm95245_data *data)
+{
+ int ret;
+
+ ret = lm95245_read_conversion_rate(data);
+ if (ret < 0)
+ return ret;
+
+ return regmap_update_bits(data->regmap, LM95245_REG_RW_CONFIG1,
+ CFG_STOP, 0);
+}
+
+static bool lm95245_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LM95245_REG_RW_CONFIG1:
+ case LM95245_REG_RW_CONVERS_RATE:
+ case LM95245_REG_W_ONE_SHOT:
+ case LM95245_REG_RW_CONFIG2:
+ case LM95245_REG_RW_REMOTE_OFFH:
+ case LM95245_REG_RW_REMOTE_OFFL:
+ case LM95245_REG_RW_REMOTE_OS_LIMIT:
+ case LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT:
+ case LM95245_REG_RW_REMOTE_TCRIT_LIMIT:
+ case LM95245_REG_RW_COMMON_HYSTERESIS:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool lm95245_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LM95245_REG_R_STATUS1:
+ case LM95245_REG_R_STATUS2:
+ case LM95245_REG_R_LOCAL_TEMPH_S:
+ case LM95245_REG_R_LOCAL_TEMPL_S:
+ case LM95245_REG_R_REMOTE_TEMPH_S:
+ case LM95245_REG_R_REMOTE_TEMPL_S:
+ case LM95245_REG_R_REMOTE_TEMPH_U:
+ case LM95245_REG_R_REMOTE_TEMPL_U:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config lm95245_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .writeable_reg = lm95245_is_writeable_reg,
+ .volatile_reg = lm95245_is_volatile_reg,
+ .cache_type = REGCACHE_RBTREE,
+ .use_single_rw = true,
+};
+
+static const u32 lm95245_chip_config[] = {
+ HWMON_C_UPDATE_INTERVAL,
+ 0
+};
+
+static const struct hwmon_channel_info lm95245_chip = {
+ .type = hwmon_chip,
+ .config = lm95245_chip_config,
+};
+
+static const u32 lm95245_temp_config[] = {
+ HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_CRIT_ALARM,
+ HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
+ HWMON_T_CRIT_HYST | HWMON_T_FAULT | HWMON_T_MAX_ALARM |
+ HWMON_T_CRIT_ALARM | HWMON_T_TYPE | HWMON_T_OFFSET,
+ 0
+};
+
+static const struct hwmon_channel_info lm95245_temp = {
+ .type = hwmon_temp,
+ .config = lm95245_temp_config,
+};
+
+static const struct hwmon_channel_info *lm95245_info[] = {
+ &lm95245_chip,
+ &lm95245_temp,
+ NULL
+};
+
+static const struct hwmon_ops lm95245_hwmon_ops = {
+ .is_visible = lm95245_is_visible,
+ .read = lm95245_read,
+ .write = lm95245_write,
+};
+
+static const struct hwmon_chip_info lm95245_chip_info = {
+ .ops = &lm95245_hwmon_ops,
+ .info = lm95245_info,
+};
+
+static int lm95245_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct lm95245_data *data;
+ struct device *hwmon_dev;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->regmap = devm_regmap_init_i2c(client, &lm95245_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+
+ mutex_init(&data->update_lock);
+
+ /* Initialize the LM95245 chip */
+ ret = lm95245_init_client(data);
+ if (ret < 0)
+ return ret;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+ data,
+ &lm95245_chip_info,
+ NULL);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+/* Driver data (common to all clients) */
+static const struct i2c_device_id lm95245_id[] = {
+ { "lm95235", 0 },
+ { "lm95245", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm95245_id);
+
+static const struct of_device_id lm95245_of_match[] = {
+ { .compatible = "national,lm95235" },
+ { .compatible = "national,lm95245" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, lm95245_of_match);
+
+static struct i2c_driver lm95245_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "lm95245",
+ .of_match_table = of_match_ptr(lm95245_of_match),
+ },
+ .probe = lm95245_probe,
+ .id_table = lm95245_id,
+ .detect = lm95245_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(lm95245_driver);
+
+MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
+MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
+MODULE_LICENSE("GPL");