loic/ina260-sysfs-driver
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ina260-sysfs-driver/ina260.c
Loic Guegan 0b4b81e273 Minor changes
2023-07-12 16:14:26 +02:00

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#include "linux/module.h" // to access basic module functions (module_init etc..)
#include "linux/uaccess.h" // copy_from_user() etc...
#include "linux/i2c.h"
#include "linux/kobject.h"
#include "linux/slab.h" // kzalloc()
#include "linux/kernel.h" // Kernel utility e.g kstrtol
#include <linux/sysfs.h>
#define INA260_REG_CONFIGURATION 0x00
#define INA260_REG_CURRENT 0x01
#define INA260_REG_VOLTAGE 0x02
#define INA260_REG_POWER 0x03
#define INA260_REG_MASKENABLE 0x06
#define INA260_REG_ALERTLIMIT 0x07
#define INA260_REG_MANUFACTURER 0xFE
#define INA260_REG_DIE 0xFF
#define INA260_IS_ATTR(_name) (strcmp(attr->attr.name, #_name) == 0)
static int ina260_avgs[8]={
1,4,16,64,128,256,512,1024
};
static char ina260_modes[8][42]={
"Power-Down (or Shutdown)","Shunt Current, Triggered",
"Bus Voltage, Triggered","Shunt Current and Bus Voltage, Triggered",
"Power-Down (or Shutdown)","Shunt Current, Continuous","Bus Voltage, Continuous",
"Shunt Current and Bus Voltage, Continuous"
};
static char ina260_ishcts_vbusct[8][9]={
"140 µs", "204 µs","332 µs", "588 µs","1.1 ms", "2.116 ms","4.156 ms","8.244 ms"
};
static struct kobject* ina260_kobj;
struct client_data {
struct kobject kobj;
struct i2c_client *client;
unsigned char reg; // Client selected register
};
static const struct i2c_device_id ina260_ids[] = {
{ "ina260", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c,ina260_ids); // Allow i2c subsystem to probe
static int ina260_read_register(struct client_data* cdata, unsigned char reg, int *value){
unsigned char bytes[2];
if(cdata->reg == reg){
//printk("Cache\n");
if(i2c_master_recv(cdata->client,bytes,2)<0){
return 1;
}
} else {
//printk("No cache\n");
if(i2c_master_send(cdata->client,&reg,1)<0){
return 1;
}
cdata->reg = reg;
if(i2c_master_recv(cdata->client,bytes,2)<0){
return 1;
}
}
*value=(bytes[0]<<8) | bytes[1];
return 0;
}
static int ina260_write_register(struct client_data* cdata, unsigned char reg, int value){
unsigned char data[3];
data[0]=reg;
data[1]=(value>>8) & 0xFF; // MSB
data[2]=value & 0xFF; // LSB
if(i2c_master_send(cdata->client,data,3)<0){
return 1;
}
return 0;
}
static ssize_t attr_show(struct kobject *_kobj,
struct kobj_attribute *attr,
char *buf)
{
int value;
struct client_data *data=container_of(_kobj,struct client_data,kobj);
unsigned char reg=INA260_REG_POWER;
if(!INA260_IS_ATTR(power)){
if (INA260_IS_ATTR(current)){
reg=INA260_REG_CURRENT;
} else if(INA260_IS_ATTR(bus_voltage)) {
reg=INA260_REG_VOLTAGE;
} else if(INA260_IS_ATTR(mask_enable)) {
reg=INA260_REG_MASKENABLE;
} else if(INA260_IS_ATTR(alert_limit)) {
reg=INA260_REG_ALERTLIMIT;
} else if(INA260_IS_ATTR(configuration)) {
reg=INA260_REG_CONFIGURATION;
} else if(INA260_IS_ATTR(manufacturer_id)) {
reg=INA260_REG_MANUFACTURER;
} else {
reg=INA260_REG_DIE;
}
}
if(ina260_read_register(data,reg,&value))
return -1;
return sprintf(buf, "%x\n", value);
}
static ssize_t attr_store(struct kobject *_kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
int data;
unsigned char reg=INA260_REG_CONFIGURATION;
if(kstrtoint(buf, 10,&data))
return -EINVAL;
if (INA260_IS_ATTR(mask_enable)){
reg=INA260_REG_MASKENABLE;
} else if (INA260_IS_ATTR(alert_limit)){
reg=INA260_REG_ALERTLIMIT;
}
if(ina260_write_register(cdata, reg, data))
return -1;
return count;
}
static ssize_t attr_field_show(struct kobject *_kobj,
struct kobj_attribute *attr,
char *buf)
{
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
int value;
if(INA260_IS_ATTR(avg)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
return -1;
return sprintf(buf, "%d\n", ina260_avgs[(value>>9)&0x7]);
} else if (INA260_IS_ATTR(mode)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
return -1;
return sprintf(buf, "%s\n", ina260_modes[value&0x7]);
} else if (INA260_IS_ATTR(ishct)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
return -1;
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(value>>3)&0x7]);
} else if (INA260_IS_ATTR(vbusct)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
return -1;
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(value>>6)&0x7]);
} else if (INA260_IS_ATTR(aff)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>4)&0x1);
} else if (INA260_IS_ATTR(cvrf)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>3)&0x1);
} else if (INA260_IS_ATTR(ocl)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>15)&0x1);
}else if (INA260_IS_ATTR(ucl)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>14)&0x1);
}else if (INA260_IS_ATTR(bol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>13)&0x1);
}else if (INA260_IS_ATTR(bul)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>12)&0x1);
}else if (INA260_IS_ATTR(pol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>11)&0x1);
}else if (INA260_IS_ATTR(cnvr)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>10)&0x1);
}else if (INA260_IS_ATTR(ovf)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>2)&0x1);
}else if (INA260_IS_ATTR(apol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", (value>>1)&0x1);
}else if (INA260_IS_ATTR(len)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
return -1;
return sprintf(buf, "%d\n", value&0x1);
}else if (INA260_IS_ATTR(did)){
if(ina260_read_register(cdata, INA260_REG_DIE,&value))
return -1;
return sprintf(buf, "0x%x\n", (value>>4));
}else if (INA260_IS_ATTR(rid)){
if(ina260_read_register(cdata, INA260_REG_DIE,&value))
return -1;
return sprintf(buf, "0x%x\n", value&0x7);
}else if (INA260_IS_ATTR(reset)){
return sprintf(buf, "0\n");
}
return 0;
}
static int ina260_set_register_3bits(struct client_data *cdata, unsigned char reg, unsigned char n, int value3bits){
int mask, value;
if(value3bits>=0 && value3bits <8){
if(ina260_read_register(cdata,reg,&value)){
return 1;
}
mask=~(0x7 << n);
value &= mask; // clear bits
value |= value3bits << n;
if(ina260_write_register(cdata,reg,value)){
return 1;
}
return 0;
}
return -EINVAL;
}
static int ina260_set_register_1bit(struct client_data *cdata, unsigned char reg, unsigned char n, int bit){
int mask, value;
if(bit==0 || bit == 1){
if(ina260_read_register(cdata,reg,&value)){
return 1;
}
mask=~(1<< n);
value &= mask; // clear bits
value |= bit << n;
if(ina260_write_register(cdata,reg,value)){
return 1;
}
return 0;
}
return -EINVAL;
}
static ssize_t attr_field_store(struct kobject *_kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
int data=0;
unsigned char reg=INA260_REG_CONFIGURATION;
if(kstrtoint(buf, 10,&data))
return -EINVAL;
if(INA260_IS_ATTR(reset) && data!=0){
if(ina260_write_register(cdata, reg, 0xFFFF))
return -1;
} else if(INA260_IS_ATTR(avg)){
if(ina260_set_register_3bits(cdata,reg,9,data))
return -EINVAL;
} else if(INA260_IS_ATTR(mode)){
if(ina260_set_register_3bits(cdata,reg,0,data))
return -EINVAL;
} else if(INA260_IS_ATTR(ishct)){
if(ina260_set_register_3bits(cdata,reg,3,data))
return -EINVAL;
}
return count;
}
// ----- Registers -----
static struct kobj_attribute configuration_attribute =
__ATTR(configuration, 0664, attr_show, attr_store);
static struct kobj_attribute current_attribute = {
.attr = {.name = "current", // current is a defined macro so need to do it manually
.mode = VERIFY_OCTAL_PERMISSIONS(0444) },
.show = attr_show,
.store = attr_store,
};
static struct kobj_attribute bus_voltage_attribute =
__ATTR(bus_voltage, 0444, attr_show, attr_store);
static struct kobj_attribute power_attribute =
__ATTR(power, 0444, attr_show, attr_store);
static struct kobj_attribute mask_enable_attribute =
__ATTR(mask_enable, 0664, attr_show, attr_store);
static struct kobj_attribute alert_limit_attribute =
__ATTR(alert_limit, 0664, attr_show, attr_store);
static struct kobj_attribute manufacturer_id_attribute =
__ATTR(manufacturer_id, 0664, attr_show, attr_store);
static struct kobj_attribute die_id_attribute=
__ATTR(die_id, 0664, attr_show, attr_store);
static struct attribute *registers_attrs[] = {
&configuration_attribute.attr,
&current_attribute.attr,
&bus_voltage_attribute.attr,
&power_attribute.attr,
&mask_enable_attribute.attr,
&alert_limit_attribute.attr,
&manufacturer_id_attribute.attr,
&die_id_attribute.attr,
NULL,
};
static const struct attribute_group registers_group = {
.attrs = registers_attrs,
.name = "registers"
};
// ----- Fields -----
static struct kobj_attribute reset_field_attribute =
__ATTR(reset, 0664, attr_field_show, attr_field_store);
static struct kobj_attribute avg_field_attribute =
__ATTR(avg, 0664, attr_field_show, attr_field_store);
static struct kobj_attribute mode_field_attribute =
__ATTR(mode, 0664, attr_field_show, attr_field_store);
static struct kobj_attribute ishct_field_attribute =
__ATTR(ishct, 0664, attr_field_show, attr_field_store);
static struct kobj_attribute vbusct_field_attribute =
__ATTR(vbusct, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute aff_field_attribute =
__ATTR(aff, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute cvrf_field_attribute =
__ATTR(cvrf, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute ocl_field_attribute =
__ATTR(ocl, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute ucl_field_attribute =
__ATTR(ucl, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute bol_field_attribute =
__ATTR(bol, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute bul_field_attribute =
__ATTR(bul, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute pol_field_attribute =
__ATTR(pol, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute cnvr_field_attribute =
__ATTR(cnvr, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute ovf_field_attribute =
__ATTR(ovf, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute apol_field_attribute =
__ATTR(apol, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute len_field_attribute =
__ATTR(len, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute did_field_attribute =
__ATTR(did, 0444, attr_field_show, attr_field_store);
static struct kobj_attribute rid_field_attribute =
__ATTR(rid, 0444, attr_field_show, attr_field_store);
static struct attribute *fields_attrs[] = {
&reset_field_attribute.attr,
&avg_field_attribute.attr,
&mode_field_attribute.attr,
&ishct_field_attribute.attr,
&vbusct_field_attribute.attr,
&aff_field_attribute.attr,
&cvrf_field_attribute.attr,
&ocl_field_attribute.attr,
&ucl_field_attribute.attr,
&bol_field_attribute.attr,
&bul_field_attribute.attr,
&pol_field_attribute.attr,
&cnvr_field_attribute.attr,
&ovf_field_attribute.attr,
&apol_field_attribute.attr,
&len_field_attribute.attr,
&did_field_attribute.attr,
&rid_field_attribute.attr,
NULL,
};
static const struct attribute_group fields_group = {
.attrs = fields_attrs,
};
static struct kobj_type ina260_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
};
static int ina260_probe_register(struct i2c_client *client, unsigned char reg, int value){
unsigned char bytes[2];
if(i2c_master_send(client,&reg,1)<0){
return 1;
}
if(i2c_master_recv(client,bytes,2)<0){
return 1;
}
return ((bytes[0]<<8) | bytes[1])!=value;
}
static int ina260_probe_new(struct i2c_client *client){
struct client_data *p;
if(ina260_probe_register(client,INA260_REG_MANUFACTURER,0x5449) ||
ina260_probe_register(client,INA260_REG_DIE,0x2270)){
printk("INA260 chip probe failed on i2c bus %d\n",client->adapter->nr);
return 1;
}
printk("New INA260 chip addr=0x%x detected on i2c bus %d\n",client->addr,client->adapter->nr);
p=kzalloc(sizeof(struct client_data),GFP_KERNEL);
kobject_init(&p->kobj,&ina260_ktype);
if(kobject_add(&p->kobj,ina260_kobj,client->dev.kobj.name)){
kobject_put(&p->kobj);
kfree(p);
return 1;
}
p->client=client;
p->reg=INA260_REG_DIE; // Last reg to be used
i2c_set_clientdata(client,p);
if(sysfs_create_group(&p->kobj,&registers_group)||
sysfs_create_group(&p->kobj,&fields_group)){
kobject_put(&p->kobj);
kfree(p);
return 1;
}
return 0;
}
static void ina260_remove(struct i2c_client *client){
struct client_data *p=i2c_get_clientdata(client);
kobject_put(&p->kobj);
kfree(p);
printk("INA260 addr=0x%x remove from i2c bus %d\n",client->addr,client->adapter->nr);
}
static struct i2c_driver ina260_driver = {
.driver = {
.name = "ina260"
},
.probe_new = ina260_probe_new,
.remove = ina260_remove,
.id_table = ina260_ids
};
static int __init ina260_init(void){
ina260_kobj = kobject_create_and_add("ina260",kernel_kobj);
i2c_add_driver(&ina260_driver);
return 0;
}
static void __exit ina260_exit(void){
i2c_del_driver(&ina260_driver);
kobject_put(ina260_kobj);
}
module_init(ina260_init);
module_exit(ina260_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Loïc Guegan");
MODULE_DESCRIPTION("INA260 Texas Instruments");
MODULE_VERSION("1.0");
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