Revision 8f4fd86aa5d6aa122619623910065d236592e37c authored by David Woodhouse on 06 January 2021, 15:39:55 UTC, committed by Juergen Gross on 13 January 2021, 15:12:03 UTC
With INTX or GSI delivery, Xen uses the event channel structures of CPU0. If the interrupt gets handled by Linux on a different CPU, then no events are seen as pending. Rather than introducing locking to allow other CPUs to process CPU0's events, just ensure that the PCI interrupts happens only on CPU0. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20210106153958.584169-3-dwmw2@infradead.org Signed-off-by: Juergen Gross <jgross@suse.com>
1 parent 3499ba8
max6697.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
*
* based on max1668.c
* Copyright (c) 2011 David George <david.george@ska.ac.za>
*/
#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_device.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_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \
(((reg) & 0x01) << 6) | ((reg) & 0x80))
#define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))
#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 MAX6581_OFFSET_MIN -31750
#define MAX6581_OFFSET_MAX 31750
#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 inline int max6581_offset_to_millic(int val)
{
return sign_extend32(val, 7) * 250;
}
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 temp_input_show(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 temp_show(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 alarm_show(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 temp_store(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 ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
size_t count)
{
int val, ret, index, select;
struct max6697_data *data;
bool channel_enabled;
long temp;
index = to_sensor_dev_attr(devattr)->index;
data = dev_get_drvdata(dev);
ret = kstrtol(buf, 10, &temp);
if (ret < 0)
return ret;
mutex_lock(&data->update_lock);
select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
if (select < 0) {
ret = select;
goto abort;
}
channel_enabled = (select & (1 << (index - 1)));
temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
val = DIV_ROUND_CLOSEST(temp, 250);
/* disable the offset for channel if the new offset is 0 */
if (val == 0) {
if (channel_enabled)
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
select & ~(1 << (index - 1)));
ret = ret < 0 ? ret : count;
goto abort;
}
if (!channel_enabled) {
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
select | (1 << (index - 1)));
if (ret < 0)
goto abort;
}
ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
ret = ret < 0 ? ret : count;
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct max6697_data *data;
int select, ret, index;
index = to_sensor_dev_attr(devattr)->index;
data = dev_get_drvdata(dev);
mutex_lock(&data->update_lock);
select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
if (select < 0)
ret = select;
else if (select & (1 << (index - 1)))
ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
else
ret = 0;
mutex_unlock(&data->update_lock);
return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret));
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);
/* There is no offset for local temperature so starting from temp2 */
static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 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 / 7; /* channel number */
int nr = index % 7; /* 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;
/* offset reg is only supported on max6581 remote channels */
if (nr == 6)
if (data->type != max6581 || channel == 0)
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,
&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_temp2_offset.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_temp3_offset.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_temp4_offset.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_temp5_offset.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_temp6_offset.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_temp7_offset.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,
&sensor_dev_attr_temp8_offset.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_ALERT_MAP_BITS(pdata->alert_mask));
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
MAX6697_OVERT_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 const struct i2c_device_id max6697_id[];
static int max6697_probe(struct i2c_client *client)
{
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;
if (client->dev.of_node)
data->type = (enum chips)of_device_get_match_data(&client->dev);
else
data->type = i2c_match_id(max6697_id, client)->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 const struct of_device_id __maybe_unused max6697_of_match[] = {
{
.compatible = "maxim,max6581",
.data = (void *)max6581
},
{
.compatible = "maxim,max6602",
.data = (void *)max6602
},
{
.compatible = "maxim,max6622",
.data = (void *)max6622
},
{
.compatible = "maxim,max6636",
.data = (void *)max6636
},
{
.compatible = "maxim,max6689",
.data = (void *)max6689
},
{
.compatible = "maxim,max6693",
.data = (void *)max6693
},
{
.compatible = "maxim,max6694",
.data = (void *)max6694
},
{
.compatible = "maxim,max6697",
.data = (void *)max6697
},
{
.compatible = "maxim,max6698",
.data = (void *)max6698
},
{
.compatible = "maxim,max6699",
.data = (void *)max6699
},
{ },
};
MODULE_DEVICE_TABLE(of, max6697_of_match);
static struct i2c_driver max6697_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "max6697",
.of_match_table = of_match_ptr(max6697_of_match),
},
.probe_new = 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");
Computing file changes ...
