--- /dev/null
+/*
+ * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
+ *
+ * based on max1668.c
+ * Copyright (c) 2011 David George <david.george@ska.ac.za>
+ *
+ * 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/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+
+#include <linux/platform_data/max6697.h>
+
+enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
+ max6697, max6698, max6699 };
+
+/* Report local sensor as temp1 */
+
+static const u8 MAX6697_REG_TEMP[] = {
+ 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
+static const u8 MAX6697_REG_TEMP_EXT[] = {
+ 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
+static const u8 MAX6697_REG_MAX[] = {
+ 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
+static const u8 MAX6697_REG_CRIT[] = {
+ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
+
+/*
+ * Map device tree / platform data register bit map to chip bit map.
+ * Applies to alert register and over-temperature register.
+ */
+#define MAX6697_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
+ (((reg) & 0x01) << 6) | ((reg) & 0x80))
+
+#define MAX6697_REG_STAT(n) (0x44 + (n))
+
+#define MAX6697_REG_CONFIG 0x41
+#define MAX6581_CONF_EXTENDED (1 << 1)
+#define MAX6693_CONF_BETA (1 << 2)
+#define MAX6697_CONF_RESISTANCE (1 << 3)
+#define MAX6697_CONF_TIMEOUT (1 << 5)
+#define MAX6697_REG_ALERT_MASK 0x42
+#define MAX6697_REG_OVERT_MASK 0x43
+
+#define MAX6581_REG_RESISTANCE 0x4a
+#define MAX6581_REG_IDEALITY 0x4b
+#define MAX6581_REG_IDEALITY_SELECT 0x4c
+#define MAX6581_REG_OFFSET 0x4d
+#define MAX6581_REG_OFFSET_SELECT 0x4e
+
+#define MAX6697_CONV_TIME 156 /* ms per channel, worst case */
+
+struct max6697_chip_data {
+ int channels;
+ u32 have_ext;
+ u32 have_crit;
+ u32 have_fault;
+ u8 valid_conf;
+ const u8 *alarm_map;
+};
+
+struct max6697_data {
+ struct i2c_client *client;
+
+ enum chips type;
+ const struct max6697_chip_data *chip;
+
+ int update_interval; /* in milli-seconds */
+ int temp_offset; /* in degrees C */
+
+ struct mutex update_lock;
+ unsigned long last_updated; /* In jiffies */
+ bool valid; /* true if following fields are valid */
+
+ /* 1x local and up to 7x remote */
+ u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */
+#define MAX6697_TEMP_INPUT 0
+#define MAX6697_TEMP_EXT 1
+#define MAX6697_TEMP_MAX 2
+#define MAX6697_TEMP_CRIT 3
+ u32 alarms;
+};
+
+/* Diode fault status bits on MAX6581 are right shifted by one bit */
+static const u8 max6581_alarm_map[] = {
+ 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23 };
+
+static const struct max6697_chip_data max6697_chip_data[] = {
+ [max6581] = {
+ .channels = 8,
+ .have_crit = 0xff,
+ .have_ext = 0x7f,
+ .have_fault = 0xfe,
+ .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
+ .alarm_map = max6581_alarm_map,
+ },
+ [max6602] = {
+ .channels = 5,
+ .have_crit = 0x12,
+ .have_ext = 0x02,
+ .have_fault = 0x1e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6622] = {
+ .channels = 5,
+ .have_crit = 0x12,
+ .have_ext = 0x02,
+ .have_fault = 0x1e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6636] = {
+ .channels = 7,
+ .have_crit = 0x72,
+ .have_ext = 0x02,
+ .have_fault = 0x7e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6689] = {
+ .channels = 7,
+ .have_crit = 0x72,
+ .have_ext = 0x02,
+ .have_fault = 0x7e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6693] = {
+ .channels = 7,
+ .have_crit = 0x72,
+ .have_ext = 0x02,
+ .have_fault = 0x7e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
+ MAX6697_CONF_TIMEOUT,
+ },
+ [max6694] = {
+ .channels = 5,
+ .have_crit = 0x12,
+ .have_ext = 0x02,
+ .have_fault = 0x1e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
+ MAX6697_CONF_TIMEOUT,
+ },
+ [max6697] = {
+ .channels = 7,
+ .have_crit = 0x72,
+ .have_ext = 0x02,
+ .have_fault = 0x7e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6698] = {
+ .channels = 7,
+ .have_crit = 0x72,
+ .have_ext = 0x02,
+ .have_fault = 0x0e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+ [max6699] = {
+ .channels = 5,
+ .have_crit = 0x12,
+ .have_ext = 0x02,
+ .have_fault = 0x1e,
+ .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
+ },
+};
+
+static struct max6697_data *max6697_update_device(struct device *dev)
+{
+ struct max6697_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+ struct max6697_data *ret = data;
+ int val;
+ int i;
+ u32 alarms;
+
+ mutex_lock(&data->update_lock);
+
+ if (data->valid &&
+ !time_after(jiffies, data->last_updated
+ + msecs_to_jiffies(data->update_interval)))
+ goto abort;
+
+ for (i = 0; i < data->chip->channels; i++) {
+ if (data->chip->have_ext & (1 << i)) {
+ val = i2c_smbus_read_byte_data(client,
+ MAX6697_REG_TEMP_EXT[i]);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp[i][MAX6697_TEMP_EXT] = val;
+ }
+
+ val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp[i][MAX6697_TEMP_INPUT] = val;
+
+ val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp[i][MAX6697_TEMP_MAX] = val;
+
+ if (data->chip->have_crit & (1 << i)) {
+ val = i2c_smbus_read_byte_data(client,
+ MAX6697_REG_CRIT[i]);
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ data->temp[i][MAX6697_TEMP_CRIT] = val;
+ }
+ }
+
+ alarms = 0;
+ for (i = 0; i < 3; i++) {
+ val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
+ if (unlikely(val < 0)) {
+ ret = ERR_PTR(val);
+ goto abort;
+ }
+ alarms = (alarms << 8) | val;
+ }
+ data->alarms = alarms;
+ data->last_updated = jiffies;
+ data->valid = true;
+abort:
+ mutex_unlock(&data->update_lock);
+
+ return ret;
+}
+
+static ssize_t show_temp_input(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ struct max6697_data *data = max6697_update_device(dev);
+ int temp;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
+ temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
+
+ return sprintf(buf, "%d\n", temp * 125);
+}
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ int index = to_sensor_dev_attr_2(devattr)->index;
+ struct max6697_data *data = max6697_update_device(dev);
+ int temp;
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ temp = data->temp[nr][index];
+ temp -= data->temp_offset;
+
+ return sprintf(buf, "%d\n", temp * 1000);
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(attr)->index;
+ struct max6697_data *data = max6697_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ if (data->chip->alarm_map)
+ index = data->chip->alarm_map[index];
+
+ return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
+}
+
+static ssize_t set_temp(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ int nr = to_sensor_dev_attr_2(devattr)->nr;
+ int index = to_sensor_dev_attr_2(devattr)->index;
+ struct max6697_data *data = dev_get_drvdata(dev);
+ long temp;
+ int ret;
+
+ ret = kstrtol(buf, 10, &temp);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->update_lock);
+ temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
+ temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
+ data->temp[nr][index] = temp;
+ ret = i2c_smbus_write_byte_data(data->client,
+ index == 2 ? MAX6697_REG_MAX[nr]
+ : MAX6697_REG_CRIT[nr],
+ temp);
+ mutex_unlock(&data->update_lock);
+
+ return ret < 0 ? ret : count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
+static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 0, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 0, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
+static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 1, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 1, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
+static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 2, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 2, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
+static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 3, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 3, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
+static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 4, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 4, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
+static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 5, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 5, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
+static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 6, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 6, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
+static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 7, MAX6697_TEMP_MAX);
+static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
+ 7, MAX6697_TEMP_CRIT);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
+static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
+static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
+static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
+static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
+static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
+static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);
+
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
+static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
+static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
+static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
+static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
+static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
+static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);
+
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);
+
+static DEVICE_ATTR(dummy, 0, NULL, NULL);
+
+static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
+ int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct max6697_data *data = dev_get_drvdata(dev);
+ const struct max6697_chip_data *chip = data->chip;
+ int channel = index / 6; /* channel number */
+ int nr = index % 6; /* attribute index within channel */
+
+ if (channel >= chip->channels)
+ return 0;
+
+ if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
+ return 0;
+ if (nr == 5 && !(chip->have_fault & (1 << channel)))
+ return 0;
+
+ return attr->mode;
+}
+
+/*
+ * max6697_is_visible uses the index into the following array to determine
+ * if attributes should be created or not. Any change in order or content
+ * must be matched in max6697_is_visible.
+ */
+static struct attribute *max6697_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+ &dev_attr_dummy.attr,
+
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_crit.dev_attr.attr,
+ &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp3_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp4_input.dev_attr.attr,
+ &sensor_dev_attr_temp4_max.dev_attr.attr,
+ &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_crit.dev_attr.attr,
+ &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp4_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp5_input.dev_attr.attr,
+ &sensor_dev_attr_temp5_max.dev_attr.attr,
+ &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_crit.dev_attr.attr,
+ &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp5_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp6_input.dev_attr.attr,
+ &sensor_dev_attr_temp6_max.dev_attr.attr,
+ &sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp6_crit.dev_attr.attr,
+ &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp6_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp7_input.dev_attr.attr,
+ &sensor_dev_attr_temp7_max.dev_attr.attr,
+ &sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp7_crit.dev_attr.attr,
+ &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp7_fault.dev_attr.attr,
+
+ &sensor_dev_attr_temp8_input.dev_attr.attr,
+ &sensor_dev_attr_temp8_max.dev_attr.attr,
+ &sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp8_crit.dev_attr.attr,
+ &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp8_fault.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group max6697_group = {
+ .attrs = max6697_attributes, .is_visible = max6697_is_visible,
+};
+__ATTRIBUTE_GROUPS(max6697);
+
+static void max6697_get_config_of(struct device_node *node,
+ struct max6697_platform_data *pdata)
+{
+ int len;
+ const __be32 *prop;
+
+ pdata->smbus_timeout_disable =
+ of_property_read_bool(node, "smbus-timeout-disable");
+ pdata->extended_range_enable =
+ of_property_read_bool(node, "extended-range-enable");
+ pdata->beta_compensation =
+ of_property_read_bool(node, "beta-compensation-enable");
+
+ prop = of_get_property(node, "alert-mask", &len);
+ if (prop && len == sizeof(u32))
+ pdata->alert_mask = be32_to_cpu(prop[0]);
+ prop = of_get_property(node, "over-temperature-mask", &len);
+ if (prop && len == sizeof(u32))
+ pdata->over_temperature_mask = be32_to_cpu(prop[0]);
+ prop = of_get_property(node, "resistance-cancellation", &len);
+ if (prop) {
+ if (len == sizeof(u32))
+ pdata->resistance_cancellation = be32_to_cpu(prop[0]);
+ else
+ pdata->resistance_cancellation = 0xfe;
+ }
+ prop = of_get_property(node, "transistor-ideality", &len);
+ if (prop && len == 2 * sizeof(u32)) {
+ pdata->ideality_mask = be32_to_cpu(prop[0]);
+ pdata->ideality_value = be32_to_cpu(prop[1]);
+ }
+}
+
+static int max6697_init_chip(struct max6697_data *data,
+ struct i2c_client *client)
+{
+ struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct max6697_platform_data p;
+ const struct max6697_chip_data *chip = data->chip;
+ int factor = chip->channels;
+ int ret, reg;
+
+ /*
+ * Don't touch configuration if neither platform data nor OF
+ * configuration was specified. If that is the case, use the
+ * current chip configuration.
+ */
+ if (!pdata && !client->dev.of_node) {
+ reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
+ if (reg < 0)
+ return reg;
+ if (data->type == max6581) {
+ if (reg & MAX6581_CONF_EXTENDED)
+ data->temp_offset = 64;
+ reg = i2c_smbus_read_byte_data(client,
+ MAX6581_REG_RESISTANCE);
+ if (reg < 0)
+ return reg;
+ factor += hweight8(reg);
+ } else {
+ if (reg & MAX6697_CONF_RESISTANCE)
+ factor++;
+ }
+ goto done;
+ }
+
+ if (client->dev.of_node) {
+ memset(&p, 0, sizeof(p));
+ max6697_get_config_of(client->dev.of_node, &p);
+ pdata = &p;
+ }
+
+ reg = 0;
+ if (pdata->smbus_timeout_disable &&
+ (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
+ reg |= MAX6697_CONF_TIMEOUT;
+ }
+ if (pdata->extended_range_enable &&
+ (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
+ reg |= MAX6581_CONF_EXTENDED;
+ data->temp_offset = 64;
+ }
+ if (pdata->resistance_cancellation &&
+ (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
+ reg |= MAX6697_CONF_RESISTANCE;
+ factor++;
+ }
+ if (pdata->beta_compensation &&
+ (chip->valid_conf & MAX6693_CONF_BETA)) {
+ reg |= MAX6693_CONF_BETA;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,
+ MAX6697_MAP_BITS(pdata->alert_mask));
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
+ MAX6697_MAP_BITS(pdata->over_temperature_mask));
+ if (ret < 0)
+ return ret;
+
+ if (data->type == max6581) {
+ factor += hweight8(pdata->resistance_cancellation >> 1);
+ ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
+ pdata->resistance_cancellation >> 1);
+ if (ret < 0)
+ return ret;
+ ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,
+ pdata->ideality_value);
+ if (ret < 0)
+ return ret;
+ ret = i2c_smbus_write_byte_data(client,
+ MAX6581_REG_IDEALITY_SELECT,
+ pdata->ideality_mask >> 1);
+ if (ret < 0)
+ return ret;
+ }
+done:
+ data->update_interval = factor * MAX6697_CONV_TIME;
+ return 0;
+}
+
+static int max6697_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ struct device *dev = &client->dev;
+ struct max6697_data *data;
+ struct device *hwmon_dev;
+ int err;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->type = id->driver_data;
+ data->chip = &max6697_chip_data[data->type];
+ data->client = client;
+ mutex_init(&data->update_lock);
+
+ err = max6697_init_chip(data, client);
+ if (err)
+ return err;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data,
+ max6697_groups);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct i2c_device_id max6697_id[] = {
+ { "max6581", max6581 },
+ { "max6602", max6602 },
+ { "max6622", max6622 },
+ { "max6636", max6636 },
+ { "max6689", max6689 },
+ { "max6693", max6693 },
+ { "max6694", max6694 },
+ { "max6697", max6697 },
+ { "max6698", max6698 },
+ { "max6699", max6699 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max6697_id);
+
+static struct i2c_driver max6697_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "max6697",
+ },
+ .probe = max6697_probe,
+ .id_table = max6697_id,
+};
+
+module_i2c_driver(max6697_driver);
+
+MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
+MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff