mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-11-07 04:09:21 +00:00
f539038e0b
Fix: ERROR: Macros with complex values should be enclosed in parenthesis by unwinding the problematic macros. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
585 lines
16 KiB
C
585 lines
16 KiB
C
/*
|
|
* Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
|
|
*
|
|
* Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu>
|
|
*
|
|
* 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; version 2 of the License.
|
|
*
|
|
* This driver is based on the ds1621 and ina209 drivers.
|
|
*
|
|
* Datasheet:
|
|
* http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c/ltc4245.h>
|
|
|
|
/* Here are names of the chip's registers (a.k.a. commands) */
|
|
enum ltc4245_cmd {
|
|
LTC4245_STATUS = 0x00, /* readonly */
|
|
LTC4245_ALERT = 0x01,
|
|
LTC4245_CONTROL = 0x02,
|
|
LTC4245_ON = 0x03,
|
|
LTC4245_FAULT1 = 0x04,
|
|
LTC4245_FAULT2 = 0x05,
|
|
LTC4245_GPIO = 0x06,
|
|
LTC4245_ADCADR = 0x07,
|
|
|
|
LTC4245_12VIN = 0x10,
|
|
LTC4245_12VSENSE = 0x11,
|
|
LTC4245_12VOUT = 0x12,
|
|
LTC4245_5VIN = 0x13,
|
|
LTC4245_5VSENSE = 0x14,
|
|
LTC4245_5VOUT = 0x15,
|
|
LTC4245_3VIN = 0x16,
|
|
LTC4245_3VSENSE = 0x17,
|
|
LTC4245_3VOUT = 0x18,
|
|
LTC4245_VEEIN = 0x19,
|
|
LTC4245_VEESENSE = 0x1a,
|
|
LTC4245_VEEOUT = 0x1b,
|
|
LTC4245_GPIOADC = 0x1c,
|
|
};
|
|
|
|
struct ltc4245_data {
|
|
struct device *hwmon_dev;
|
|
|
|
struct mutex update_lock;
|
|
bool valid;
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
/* Control registers */
|
|
u8 cregs[0x08];
|
|
|
|
/* Voltage registers */
|
|
u8 vregs[0x0d];
|
|
|
|
/* GPIO ADC registers */
|
|
bool use_extra_gpios;
|
|
int gpios[3];
|
|
};
|
|
|
|
/*
|
|
* Update the readings from the GPIO pins. If the driver has been configured to
|
|
* sample all GPIO's as analog voltages, a round-robin sampling method is used.
|
|
* Otherwise, only the configured GPIO pin is sampled.
|
|
*
|
|
* LOCKING: must hold data->update_lock
|
|
*/
|
|
static void ltc4245_update_gpios(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ltc4245_data *data = i2c_get_clientdata(client);
|
|
u8 gpio_curr, gpio_next, gpio_reg;
|
|
int i;
|
|
|
|
/* no extra gpio support, we're basically done */
|
|
if (!data->use_extra_gpios) {
|
|
data->gpios[0] = data->vregs[LTC4245_GPIOADC - 0x10];
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the last reading was too long ago, then we mark all old GPIO
|
|
* readings as stale by setting them to -EAGAIN
|
|
*/
|
|
if (time_after(jiffies, data->last_updated + 5 * HZ)) {
|
|
dev_dbg(&client->dev, "Marking GPIOs invalid\n");
|
|
for (i = 0; i < ARRAY_SIZE(data->gpios); i++)
|
|
data->gpios[i] = -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* Get the current GPIO pin
|
|
*
|
|
* The datasheet calls these GPIO[1-3], but we'll calculate the zero
|
|
* based array index instead, and call them GPIO[0-2]. This is much
|
|
* easier to think about.
|
|
*/
|
|
gpio_curr = (data->cregs[LTC4245_GPIO] & 0xc0) >> 6;
|
|
if (gpio_curr > 0)
|
|
gpio_curr -= 1;
|
|
|
|
/* Read the GPIO voltage from the GPIOADC register */
|
|
data->gpios[gpio_curr] = data->vregs[LTC4245_GPIOADC - 0x10];
|
|
|
|
/* Find the next GPIO pin to read */
|
|
gpio_next = (gpio_curr + 1) % ARRAY_SIZE(data->gpios);
|
|
|
|
/*
|
|
* Calculate the correct setting for the GPIO register so it will
|
|
* sample the next GPIO pin
|
|
*/
|
|
gpio_reg = (data->cregs[LTC4245_GPIO] & 0x3f) | ((gpio_next + 1) << 6);
|
|
|
|
/* Update the GPIO register */
|
|
i2c_smbus_write_byte_data(client, LTC4245_GPIO, gpio_reg);
|
|
|
|
/* Update saved data */
|
|
data->cregs[LTC4245_GPIO] = gpio_reg;
|
|
}
|
|
|
|
static struct ltc4245_data *ltc4245_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ltc4245_data *data = i2c_get_clientdata(client);
|
|
s32 val;
|
|
int i;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
|
|
|
|
dev_dbg(&client->dev, "Starting ltc4245 update\n");
|
|
|
|
/* Read control registers -- 0x00 to 0x07 */
|
|
for (i = 0; i < ARRAY_SIZE(data->cregs); i++) {
|
|
val = i2c_smbus_read_byte_data(client, i);
|
|
if (unlikely(val < 0))
|
|
data->cregs[i] = 0;
|
|
else
|
|
data->cregs[i] = val;
|
|
}
|
|
|
|
/* Read voltage registers -- 0x10 to 0x1c */
|
|
for (i = 0; i < ARRAY_SIZE(data->vregs); i++) {
|
|
val = i2c_smbus_read_byte_data(client, i+0x10);
|
|
if (unlikely(val < 0))
|
|
data->vregs[i] = 0;
|
|
else
|
|
data->vregs[i] = val;
|
|
}
|
|
|
|
/* Update GPIO readings */
|
|
ltc4245_update_gpios(dev);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
/* Return the voltage from the given register in millivolts */
|
|
static int ltc4245_get_voltage(struct device *dev, u8 reg)
|
|
{
|
|
struct ltc4245_data *data = ltc4245_update_device(dev);
|
|
const u8 regval = data->vregs[reg - 0x10];
|
|
u32 voltage = 0;
|
|
|
|
switch (reg) {
|
|
case LTC4245_12VIN:
|
|
case LTC4245_12VOUT:
|
|
voltage = regval * 55;
|
|
break;
|
|
case LTC4245_5VIN:
|
|
case LTC4245_5VOUT:
|
|
voltage = regval * 22;
|
|
break;
|
|
case LTC4245_3VIN:
|
|
case LTC4245_3VOUT:
|
|
voltage = regval * 15;
|
|
break;
|
|
case LTC4245_VEEIN:
|
|
case LTC4245_VEEOUT:
|
|
voltage = regval * -55;
|
|
break;
|
|
case LTC4245_GPIOADC:
|
|
voltage = regval * 10;
|
|
break;
|
|
default:
|
|
/* If we get here, the developer messed up */
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
}
|
|
|
|
return voltage;
|
|
}
|
|
|
|
/* Return the current in the given sense register in milliAmperes */
|
|
static unsigned int ltc4245_get_current(struct device *dev, u8 reg)
|
|
{
|
|
struct ltc4245_data *data = ltc4245_update_device(dev);
|
|
const u8 regval = data->vregs[reg - 0x10];
|
|
unsigned int voltage;
|
|
unsigned int curr;
|
|
|
|
/*
|
|
* The strange looking conversions that follow are fixed-point
|
|
* math, since we cannot do floating point in the kernel.
|
|
*
|
|
* Step 1: convert sense register to microVolts
|
|
* Step 2: convert voltage to milliAmperes
|
|
*
|
|
* If you play around with the V=IR equation, you come up with
|
|
* the following: X uV / Y mOhm == Z mA
|
|
*
|
|
* With the resistors that are fractions of a milliOhm, we multiply
|
|
* the voltage and resistance by 10, to shift the decimal point.
|
|
* Now we can use the normal division operator again.
|
|
*/
|
|
|
|
switch (reg) {
|
|
case LTC4245_12VSENSE:
|
|
voltage = regval * 250; /* voltage in uV */
|
|
curr = voltage / 50; /* sense resistor 50 mOhm */
|
|
break;
|
|
case LTC4245_5VSENSE:
|
|
voltage = regval * 125; /* voltage in uV */
|
|
curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */
|
|
break;
|
|
case LTC4245_3VSENSE:
|
|
voltage = regval * 125; /* voltage in uV */
|
|
curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */
|
|
break;
|
|
case LTC4245_VEESENSE:
|
|
voltage = regval * 250; /* voltage in uV */
|
|
curr = voltage / 100; /* sense resistor 100 mOhm */
|
|
break;
|
|
default:
|
|
/* If we get here, the developer messed up */
|
|
WARN_ON_ONCE(1);
|
|
curr = 0;
|
|
break;
|
|
}
|
|
|
|
return curr;
|
|
}
|
|
|
|
static ssize_t ltc4245_show_voltage(struct device *dev,
|
|
struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
const int voltage = ltc4245_get_voltage(dev, attr->index);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
|
|
}
|
|
|
|
static ssize_t ltc4245_show_current(struct device *dev,
|
|
struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
const unsigned int curr = ltc4245_get_current(dev, attr->index);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", curr);
|
|
}
|
|
|
|
static ssize_t ltc4245_show_power(struct device *dev,
|
|
struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
const unsigned int curr = ltc4245_get_current(dev, attr->index);
|
|
const int output_voltage = ltc4245_get_voltage(dev, attr->index+1);
|
|
|
|
/* current in mA * voltage in mV == power in uW */
|
|
const unsigned int power = abs(output_voltage * curr);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", power);
|
|
}
|
|
|
|
static ssize_t ltc4245_show_alarm(struct device *dev,
|
|
struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
|
|
struct ltc4245_data *data = ltc4245_update_device(dev);
|
|
const u8 reg = data->cregs[attr->index];
|
|
const u32 mask = attr->nr;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
|
|
}
|
|
|
|
static ssize_t ltc4245_show_gpio(struct device *dev,
|
|
struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct ltc4245_data *data = ltc4245_update_device(dev);
|
|
int val = data->gpios[attr->index];
|
|
|
|
/* handle stale GPIO's */
|
|
if (val < 0)
|
|
return val;
|
|
|
|
/* Convert to millivolts and print */
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", val * 10);
|
|
}
|
|
|
|
/* Construct a sensor_device_attribute structure for each register */
|
|
|
|
/* Input voltages */
|
|
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_12VIN);
|
|
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_5VIN);
|
|
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_3VIN);
|
|
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_VEEIN);
|
|
|
|
/* Input undervoltage alarms */
|
|
static SENSOR_DEVICE_ATTR_2(in1_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 0, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(in2_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 1, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(in3_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 2, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(in4_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 3, LTC4245_FAULT1);
|
|
|
|
/* Currents (via sense resistor) */
|
|
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4245_show_current, NULL,
|
|
LTC4245_12VSENSE);
|
|
static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ltc4245_show_current, NULL,
|
|
LTC4245_5VSENSE);
|
|
static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, ltc4245_show_current, NULL,
|
|
LTC4245_3VSENSE);
|
|
static SENSOR_DEVICE_ATTR(curr4_input, S_IRUGO, ltc4245_show_current, NULL,
|
|
LTC4245_VEESENSE);
|
|
|
|
/* Overcurrent alarms */
|
|
static SENSOR_DEVICE_ATTR_2(curr1_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 4, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(curr2_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 5, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(curr3_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 6, LTC4245_FAULT1);
|
|
static SENSOR_DEVICE_ATTR_2(curr4_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 7, LTC4245_FAULT1);
|
|
|
|
/* Output voltages */
|
|
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_12VOUT);
|
|
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_5VOUT);
|
|
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_3VOUT);
|
|
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, ltc4245_show_voltage, NULL,
|
|
LTC4245_VEEOUT);
|
|
|
|
/* Power Bad alarms */
|
|
static SENSOR_DEVICE_ATTR_2(in5_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 0, LTC4245_FAULT2);
|
|
static SENSOR_DEVICE_ATTR_2(in6_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 1, LTC4245_FAULT2);
|
|
static SENSOR_DEVICE_ATTR_2(in7_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 2, LTC4245_FAULT2);
|
|
static SENSOR_DEVICE_ATTR_2(in8_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
|
|
1 << 3, LTC4245_FAULT2);
|
|
|
|
/* GPIO voltages */
|
|
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, ltc4245_show_gpio, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, ltc4245_show_gpio, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, ltc4245_show_gpio, NULL, 2);
|
|
|
|
/* Power Consumption (virtual) */
|
|
static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4245_show_power, NULL,
|
|
LTC4245_12VSENSE);
|
|
static SENSOR_DEVICE_ATTR(power2_input, S_IRUGO, ltc4245_show_power, NULL,
|
|
LTC4245_5VSENSE);
|
|
static SENSOR_DEVICE_ATTR(power3_input, S_IRUGO, ltc4245_show_power, NULL,
|
|
LTC4245_3VSENSE);
|
|
static SENSOR_DEVICE_ATTR(power4_input, S_IRUGO, ltc4245_show_power, NULL,
|
|
LTC4245_VEESENSE);
|
|
|
|
/*
|
|
* Finally, construct an array of pointers to members of the above objects,
|
|
* as required for sysfs_create_group()
|
|
*/
|
|
static struct attribute *ltc4245_std_attributes[] = {
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in2_input.dev_attr.attr,
|
|
&sensor_dev_attr_in3_input.dev_attr.attr,
|
|
&sensor_dev_attr_in4_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in2_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in3_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in4_min_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_curr1_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr2_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr3_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr4_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_curr4_max_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_in5_input.dev_attr.attr,
|
|
&sensor_dev_attr_in6_input.dev_attr.attr,
|
|
&sensor_dev_attr_in7_input.dev_attr.attr,
|
|
&sensor_dev_attr_in8_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_in5_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in6_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in7_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in8_min_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_in9_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_power1_input.dev_attr.attr,
|
|
&sensor_dev_attr_power2_input.dev_attr.attr,
|
|
&sensor_dev_attr_power3_input.dev_attr.attr,
|
|
&sensor_dev_attr_power4_input.dev_attr.attr,
|
|
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *ltc4245_gpio_attributes[] = {
|
|
&sensor_dev_attr_in10_input.dev_attr.attr,
|
|
&sensor_dev_attr_in11_input.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ltc4245_std_group = {
|
|
.attrs = ltc4245_std_attributes,
|
|
};
|
|
|
|
static const struct attribute_group ltc4245_gpio_group = {
|
|
.attrs = ltc4245_gpio_attributes,
|
|
};
|
|
|
|
static int ltc4245_sysfs_create_groups(struct i2c_client *client)
|
|
{
|
|
struct ltc4245_data *data = i2c_get_clientdata(client);
|
|
struct device *dev = &client->dev;
|
|
int ret;
|
|
|
|
/* register the standard sysfs attributes */
|
|
ret = sysfs_create_group(&dev->kobj, <c4245_std_group);
|
|
if (ret) {
|
|
dev_err(dev, "unable to register standard attributes\n");
|
|
return ret;
|
|
}
|
|
|
|
/* if we're using the extra gpio support, register it's attributes */
|
|
if (data->use_extra_gpios) {
|
|
ret = sysfs_create_group(&dev->kobj, <c4245_gpio_group);
|
|
if (ret) {
|
|
dev_err(dev, "unable to register gpio attributes\n");
|
|
sysfs_remove_group(&dev->kobj, <c4245_std_group);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ltc4245_sysfs_remove_groups(struct i2c_client *client)
|
|
{
|
|
struct ltc4245_data *data = i2c_get_clientdata(client);
|
|
struct device *dev = &client->dev;
|
|
|
|
if (data->use_extra_gpios)
|
|
sysfs_remove_group(&dev->kobj, <c4245_gpio_group);
|
|
|
|
sysfs_remove_group(&dev->kobj, <c4245_std_group);
|
|
}
|
|
|
|
static bool ltc4245_use_extra_gpios(struct i2c_client *client)
|
|
{
|
|
struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
#ifdef CONFIG_OF
|
|
struct device_node *np = client->dev.of_node;
|
|
#endif
|
|
|
|
/* prefer platform data */
|
|
if (pdata)
|
|
return pdata->use_extra_gpios;
|
|
|
|
#ifdef CONFIG_OF
|
|
/* fallback on OF */
|
|
if (of_find_property(np, "ltc4245,use-extra-gpios", NULL))
|
|
return true;
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
static int ltc4245_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
struct ltc4245_data *data;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
mutex_init(&data->update_lock);
|
|
data->use_extra_gpios = ltc4245_use_extra_gpios(client);
|
|
|
|
/* Initialize the LTC4245 chip */
|
|
i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00);
|
|
i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00);
|
|
|
|
/* Register sysfs hooks */
|
|
ret = ltc4245_sysfs_create_groups(client);
|
|
if (ret)
|
|
return ret;
|
|
|
|
data->hwmon_dev = hwmon_device_register(&client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
ret = PTR_ERR(data->hwmon_dev);
|
|
goto out_hwmon_device_register;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_hwmon_device_register:
|
|
ltc4245_sysfs_remove_groups(client);
|
|
return ret;
|
|
}
|
|
|
|
static int ltc4245_remove(struct i2c_client *client)
|
|
{
|
|
struct ltc4245_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
ltc4245_sysfs_remove_groups(client);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ltc4245_id[] = {
|
|
{ "ltc4245", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ltc4245_id);
|
|
|
|
/* This is the driver that will be inserted */
|
|
static struct i2c_driver ltc4245_driver = {
|
|
.driver = {
|
|
.name = "ltc4245",
|
|
},
|
|
.probe = ltc4245_probe,
|
|
.remove = ltc4245_remove,
|
|
.id_table = ltc4245_id,
|
|
};
|
|
|
|
module_i2c_driver(ltc4245_driver);
|
|
|
|
MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
|
|
MODULE_DESCRIPTION("LTC4245 driver");
|
|
MODULE_LICENSE("GPL");
|