--- /dev/null
+/*
+ * Texas Instruments TMP103 SMBus temperature sensor driver
+ * Copyright (C) 2014 Heiko Schocher <hs@denx.de>
+ *
+ * Based on:
+ * Texas Instruments TMP102 SMBus temperature sensor driver
+ *
+ * Copyright (C) 2010 Steven King <sfking@fdwdc.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/jiffies.h>
+#include <linux/regmap.h>
+
+#define TMP103_TEMP_REG 0x00
+#define TMP103_CONF_REG 0x01
+#define TMP103_TLOW_REG 0x02
+#define TMP103_THIGH_REG 0x03
+
+#define TMP103_CONF_M0 0x01
+#define TMP103_CONF_M1 0x02
+#define TMP103_CONF_LC 0x04
+#define TMP103_CONF_FL 0x08
+#define TMP103_CONF_FH 0x10
+#define TMP103_CONF_CR0 0x20
+#define TMP103_CONF_CR1 0x40
+#define TMP103_CONF_ID 0x80
+#define TMP103_CONF_SD (TMP103_CONF_M1)
+#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
+
+#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
+#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
+ TMP103_CONF_M0 | TMP103_CONF_M1)
+
+static inline int tmp103_reg_to_mc(s8 val)
+{
+ return val * 1000;
+}
+
+static inline u8 tmp103_mc_to_reg(int val)
+{
+ return DIV_ROUND_CLOSEST(val, 1000);
+}
+
+static ssize_t tmp103_show_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+ struct regmap *regmap = dev_get_drvdata(dev);
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(regmap, sda->index, ®val);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
+}
+
+static ssize_t tmp103_set_temp(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
+ struct regmap *regmap = dev_get_drvdata(dev);
+ long val;
+ int ret;
+
+ if (kstrtol(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ val = clamp_val(val, -55000, 127000);
+ ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
+ return ret ? ret : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
+ TMP103_TEMP_REG);
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
+ tmp103_set_temp, TMP103_TLOW_REG);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
+ tmp103_set_temp, TMP103_THIGH_REG);
+
+static struct attribute *tmp103_attrs[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(tmp103);
+
+static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+ return reg == TMP103_TEMP_REG;
+}
+
+static struct regmap_config tmp103_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = TMP103_THIGH_REG,
+ .volatile_reg = tmp103_regmap_is_volatile,
+};
+
+static int tmp103_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct device *hwmon_dev;
+ struct regmap *regmap;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev,
+ "adapter doesn't support SMBus byte transactions\n");
+ return -ENODEV;
+ }
+
+ regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(regmap);
+ }
+
+ ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
+ TMP103_CONFIG);
+ if (ret < 0) {
+ dev_err(&client->dev, "error writing config register\n");
+ return ret;
+ }
+
+ hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+ regmap, tmp103_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+#ifdef CONFIG_PM
+static int tmp103_suspend(struct device *dev)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+
+ return regmap_update_bits(regmap, TMP103_CONF_REG,
+ TMP103_CONF_SD_MASK, 0);
+}
+
+static int tmp103_resume(struct device *dev)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+
+ return regmap_update_bits(regmap, TMP103_CONF_REG,
+ TMP103_CONF_SD_MASK, TMP103_CONF_SD);
+}
+
+static const struct dev_pm_ops tmp103_dev_pm_ops = {
+ .suspend = tmp103_suspend,
+ .resume = tmp103_resume,
+};
+
+#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
+#else
+#define TMP103_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id tmp103_id[] = {
+ { "tmp103", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tmp103_id);
+
+static struct i2c_driver tmp103_driver = {
+ .driver = {
+ .name = "tmp103",
+ .pm = TMP103_DEV_PM_OPS,
+ },
+ .probe = tmp103_probe,
+ .id_table = tmp103_id,
+};
+
+module_i2c_driver(tmp103_driver);
+
+MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
+MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff