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Loic Guegan 2023-07-13 10:56:14 +02:00
parent b50f9839d8
commit 1e651c5327
1 changed files with 120 additions and 90 deletions
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210
ina260.c
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@ -1,11 +1,12 @@
#include "linux/module.h" // to access basic module functions (module_init etc..)
#include "linux/uaccess.h" // copy_from_user() etc...
#include "linux/module.h"
#include "linux/uaccess.h"
#include "linux/i2c.h"
#include "linux/kobject.h"
#include "linux/slab.h" // kzalloc()
#include "linux/kernel.h" // Kernel utility e.g kstrtol
#include "linux/slab.h"
#include "linux/kernel.h"
#include <linux/sysfs.h>
// ina260 chip registers
#define INA260_REG_CONFIGURATION 0x00
#define INA260_REG_CURRENT 0x01
#define INA260_REG_VOLTAGE 0x02
@ -17,10 +18,12 @@
#define INA260_IS_ATTR(_name) (strcmp(attr->attr.name, #_name) == 0)
// ina260 average modes list
static int ina260_avgs[8]={
1,4,16,64,128,256,512,1024
};
// ina260 operating modes list
static char ina260_modes[8][42]={
"Power-Down (or Shutdown)","Shunt Current, Triggered",
"Bus Voltage, Triggered","Shunt Current and Bus Voltage, Triggered",
@ -28,32 +31,41 @@ static char ina260_modes[8][42]={
"Shunt Current and Bus Voltage, Continuous"
};
// ina260 conversion times list
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"
};
// Driver root
static struct kobject* ina260_kobj;
// Data attached to i2c clients
struct client_data {
struct kobject kobj;
struct i2c_client *client;
unsigned char reg; // Client selected register
unsigned char reg; // Slave selected register
};
static const struct i2c_device_id ina260_ids[] = {
{ "ina260", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c,ina260_ids); // Allow i2c subsystem to probe
MODULE_DEVICE_TABLE(i2c,ina260_ids);
/**
* @brief Read from ina260 registers
*
* @param cdata client data to use to communicate
* @param reg register to read
* @param value register content output
* @return int 0 on success, 1 on communication errors
*/
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;
@ -64,6 +76,14 @@ static int ina260_read_register(struct client_data* cdata, unsigned char reg, in
return 0;
}
/**
* @brief Write to ina260 registers
*
* @param cdata client data to use to communicate
* @param reg register to write to
* @param value value to write in @a reg
* @return int 0 on success, 1 on communication errors
*/
static int ina260_write_register(struct client_data* cdata, unsigned char reg, int value){
unsigned char data[3];
data[0]=reg;
@ -75,11 +95,11 @@ static int ina260_write_register(struct client_data* cdata, unsigned char reg, i
}
static ssize_t attr_show(struct kobject *_kobj,
struct kobj_attribute *attr,
char *buf)
struct kobj_attribute *attr,
char *buf)
{
int value;
struct client_data *data=container_of(_kobj,struct client_data,kobj);
int rvalue;
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
unsigned char reg=INA260_REG_POWER;
if(!INA260_IS_ATTR(power)){
@ -100,10 +120,10 @@ static ssize_t attr_show(struct kobject *_kobj,
}
}
if(ina260_read_register(data,reg,&value))
if(ina260_read_register(cdata,reg,&rvalue))
return -1;
return sprintf(buf, "%x\n", value);
return sprintf(buf, "%x\n", rvalue);
}
@ -111,10 +131,11 @@ static ssize_t attr_store(struct kobject *_kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
int uvalue;
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
int data;
unsigned char reg=INA260_REG_CONFIGURATION;
if(kstrtoint(buf, 0,&data))
if(kstrtoint(buf, 0,&uvalue))
return -EINVAL;
if (INA260_IS_ATTR(mask_enable)){
@ -123,7 +144,7 @@ static ssize_t attr_store(struct kobject *_kobj,
reg=INA260_REG_ALERTLIMIT;
}
if(ina260_write_register(cdata, reg, data))
if(ina260_write_register(cdata, reg, uvalue))
return -1;
return count;
@ -133,112 +154,110 @@ static ssize_t attr_field_show(struct kobject *_kobj,
struct kobj_attribute *attr,
char *buf)
{
int rvalue;
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))
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&rvalue))
return -1;
return sprintf(buf, "%d\n", ina260_avgs[(value>>9)&0x7]);
return sprintf(buf, "%d\n", ina260_avgs[(rvalue>>9)&0x7]);
} else if (INA260_IS_ATTR(mode)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&rvalue))
return -1;
return sprintf(buf, "%s\n", ina260_modes[value&0x7]);
return sprintf(buf, "%s\n", ina260_modes[rvalue&0x7]);
} else if (INA260_IS_ATTR(ishct)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&rvalue))
return -1;
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(value>>3)&0x7]);
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(rvalue>>3)&0x7]);
} else if (INA260_IS_ATTR(vbusct)){
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&value))
if(ina260_read_register(cdata, INA260_REG_CONFIGURATION,&rvalue))
return -1;
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(value>>6)&0x7]);
return sprintf(buf, "%s\n", ina260_ishcts_vbusct[(rvalue>>6)&0x7]);
} else if (INA260_IS_ATTR(aff)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>4)&0x1);
return sprintf(buf, "%d\n", (rvalue>>4)&0x1);
} else if (INA260_IS_ATTR(cvrf)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>3)&0x1);
return sprintf(buf, "%d\n", (rvalue>>3)&0x1);
} else if (INA260_IS_ATTR(ocl)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>15)&0x1);
return sprintf(buf, "%d\n", (rvalue>>15)&0x1);
}else if (INA260_IS_ATTR(ucl)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>14)&0x1);
return sprintf(buf, "%d\n", (rvalue>>14)&0x1);
}else if (INA260_IS_ATTR(bol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>13)&0x1);
return sprintf(buf, "%d\n", (rvalue>>13)&0x1);
}else if (INA260_IS_ATTR(bul)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>12)&0x1);
return sprintf(buf, "%d\n", (rvalue>>12)&0x1);
}else if (INA260_IS_ATTR(pol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>11)&0x1);
return sprintf(buf, "%d\n", (rvalue>>11)&0x1);
}else if (INA260_IS_ATTR(cnvr)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>10)&0x1);
return sprintf(buf, "%d\n", (rvalue>>10)&0x1);
}else if (INA260_IS_ATTR(ovf)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>2)&0x1);
return sprintf(buf, "%d\n", (rvalue>>2)&0x1);
}else if (INA260_IS_ATTR(apol)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", (value>>1)&0x1);
return sprintf(buf, "%d\n", (rvalue>>1)&0x1);
}else if (INA260_IS_ATTR(len)){
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&value))
if(ina260_read_register(cdata, INA260_REG_MASKENABLE,&rvalue))
return -1;
return sprintf(buf, "%d\n", value&0x1);
return sprintf(buf, "%d\n", rvalue&0x1);
}else if (INA260_IS_ATTR(did)){
if(ina260_read_register(cdata, INA260_REG_DIE,&value))
if(ina260_read_register(cdata, INA260_REG_DIE,&rvalue))
return -1;
return sprintf(buf, "0x%x\n", (value>>4));
return sprintf(buf, "0x%x\n", (rvalue>>4));
}else if (INA260_IS_ATTR(rid)){
if(ina260_read_register(cdata, INA260_REG_DIE,&value))
if(ina260_read_register(cdata, INA260_REG_DIE,&rvalue))
return -1;
return sprintf(buf, "0x%x\n", value&0x7);
return sprintf(buf, "0x%x\n", rvalue&0x7);
}else if (INA260_IS_ATTR(reset)){
return sprintf(buf, "0\n");
}
return 0;
}
static int ina260_write_field3(struct client_data *cdata, unsigned char reg, unsigned char n, int value3bits){
int mask, value;
if(!(value3bits>=0 && value3bits <8))
static int ina260_write_field3(struct client_data *cdata, unsigned char reg, unsigned char n, int uvalue){
int rvalue;
if(!(uvalue>=0 && uvalue <8))
return -EINVAL;
// Fetch register value:
if(ina260_read_register(cdata,reg,&value))
if(ina260_read_register(cdata,reg,&rvalue))
return 1;
// Write bits:
mask=~(0x7 << n);
value &= mask; // clear bits
value |= (value3bits << n);
rvalue &= ~(0x7 << n); // clear bits
rvalue |= (uvalue << n);
// Write register value:
if(ina260_write_register(cdata,reg,value))
if(ina260_write_register(cdata,reg,rvalue))
return 1;
return 0;
}
static int ina260_write_field1(struct client_data *cdata, unsigned char reg, unsigned char n, int bit){
int mask, value;
if(!(bit==0 || bit == 1))
static int ina260_write_field1(struct client_data *cdata, unsigned char reg, unsigned char n, int uvalue){
int rvalue;
if(!(uvalue==0 || uvalue == 1))
return -EINVAL;
// Fetch register value:
if(ina260_read_register(cdata,reg,&value))
if(ina260_read_register(cdata,reg,&rvalue))
return 1;
// Set bit:
mask=~(1<< n);
value &= mask; // clear bit
value |= (bit << n);
rvalue &= ~(1<< n); // clear bit
rvalue |= (uvalue << n);
// Write register value
if(ina260_write_register(cdata,reg,value))
if(ina260_write_register(cdata,reg,rvalue))
return 1;
return 0;
}
@ -247,38 +266,38 @@ static ssize_t attr_field_store(struct kobject *_kobj,
struct kobj_attribute *attr,
const char __user *buf, size_t count)
{
int uvalue, ret=0;
struct client_data *cdata=container_of(_kobj,struct client_data,kobj);
int data=0, ret=count;
// Extract user supplied value
if(kstrtoint(buf, 0,&data))
// Extract user supplied value:
if(kstrtoint(buf, 0,&uvalue))
return -EINVAL;
// Store:
if(INA260_IS_ATTR(reset) && data!=0){
if(INA260_IS_ATTR(reset) && uvalue!=0){
ret=ina260_write_register(cdata, INA260_REG_CONFIGURATION, 0xFFFF); // Much quicker this way
} else if(INA260_IS_ATTR(avg)){
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,9,data);
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,9,uvalue);
} else if(INA260_IS_ATTR(mode)){
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,0,data);
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,0,uvalue);
} else if(INA260_IS_ATTR(ishct)){
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,3,data);
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,3,uvalue);
} else if(INA260_IS_ATTR(vbusct)){
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,6,data);
ret=ina260_write_field3(cdata,INA260_REG_CONFIGURATION,6,uvalue);
} else if(INA260_IS_ATTR(ocl)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,15,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,15,uvalue);
} else if(INA260_IS_ATTR(ucl)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,14,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,14,uvalue);
} else if(INA260_IS_ATTR(bol)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,13,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,13,uvalue);
} else if(INA260_IS_ATTR(bul)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,12,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,12,uvalue);
} else if(INA260_IS_ATTR(pol)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,11,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,11,uvalue);
} else if(INA260_IS_ATTR(cnvr)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,10,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,10,uvalue);
} else if(INA260_IS_ATTR(apol)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,1,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,1,uvalue);
} else if(INA260_IS_ATTR(len)){
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,0,data);
ret=ina260_write_field1(cdata,INA260_REG_MASKENABLE,0,uvalue);
}
return ret ? ret: count;
}
@ -320,7 +339,6 @@ 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);
@ -388,6 +406,14 @@ static struct kobj_type ina260_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
};
/**
* @brief Compare on ina260 register to a supplied value
*
* @param client i2c client to use for communications
* @param reg register to use for comparison
* @param value register expected value
* @return int 0 if register contains value and 1 otherwise
*/
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)
@ -399,22 +425,26 @@ static int ina260_probe_register(struct i2c_client *client, unsigned char reg, i
static int ina260_probe_new(struct i2c_client *client){
struct client_data *p;
// Attempt device discovery:
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);
printk("ina260 probe fails bus=%d address=0x%02x\n",client->adapter->nr,client->addr);
return 1;
}
printk("New INA260 chip addr=0x%x detected on i2c bus %d\n",client->addr,client->adapter->nr);
// Initialize client data:
printk("ina260 detected bus=%d address=0x%02x\n",client->adapter->nr,client->addr);
p=kzalloc(sizeof(struct client_data),GFP_KERNEL);
kobject_init(&p->kobj,&ina260_ktype);
// Setup sysfs root kobject:
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
p->reg=INA260_REG_DIE; // Maintain cache coherence
i2c_set_clientdata(client,p);
// Setup sysfs groups:
if(sysfs_create_group(&p->kobj,&registers_group)||
sysfs_create_group(&p->kobj,&fields_group)){
kobject_put(&p->kobj);
@ -428,7 +458,7 @@ static int 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);
printk("ina260 removed bus=%d address=0x%02x\n",client->adapter->nr,client->addr);
return 0;
}