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/*
* Copyright 2015 Martin Peres
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Martin Peres
*/
#include "priv.h"
#include <subdev/bios.h>
#include <subdev/bios/extdev.h>
#include <subdev/bios/iccsense.h>
#include <subdev/i2c.h>
static bool
nvkm_iccsense_validate_device(struct i2c_adapter *i2c, u8 addr,
enum nvbios_extdev_type type, u8 rail)
{
switch (type) {
case NVBIOS_EXTDEV_INA209:
case NVBIOS_EXTDEV_INA219:
return rail == 0 && nv_rd16i2cr(i2c, addr, 0x0) >= 0;
case NVBIOS_EXTDEV_INA3221:
return rail <= 3 &&
nv_rd16i2cr(i2c, addr, 0xff) == 0x3220 &&
nv_rd16i2cr(i2c, addr, 0xfe) == 0x5449;
default:
return false;
}
}
static int
nvkm_iccsense_poll_lane(struct i2c_adapter *i2c, u8 addr, u8 shunt_reg,
u8 shunt_shift, u8 bus_reg, u8 bus_shift, u8 shunt,
u16 lsb)
{
int vshunt = nv_rd16i2cr(i2c, addr, shunt_reg);
int vbus = nv_rd16i2cr(i2c, addr, bus_reg);
if (vshunt < 0 || vbus < 0)
return -EINVAL;
vshunt >>= shunt_shift;
vbus >>= bus_shift;
return vbus * vshunt * lsb / shunt;
}
static int
nvkm_iccsense_ina2x9_read(struct nvkm_iccsense *iccsense,
struct nvkm_iccsense_rail *rail,
u8 shunt_reg, u8 bus_reg)
{
return nvkm_iccsense_poll_lane(rail->i2c, rail->addr, shunt_reg, 0,
bus_reg, 3, rail->mohm, 10 * 4);
}
static int
nvkm_iccsense_ina209_read(struct nvkm_iccsense *iccsense,
struct nvkm_iccsense_rail *rail)
{
return nvkm_iccsense_ina2x9_read(iccsense, rail, 3, 4);
}
static int
nvkm_iccsense_ina219_read(struct nvkm_iccsense *iccsense,
struct nvkm_iccsense_rail *rail)
{
return nvkm_iccsense_ina2x9_read(iccsense, rail, 1, 2);
}
static int
nvkm_iccsense_ina3221_read(struct nvkm_iccsense *iccsense,
struct nvkm_iccsense_rail *rail)
{
return nvkm_iccsense_poll_lane(rail->i2c, rail->addr,
1 + (rail->rail * 2), 3,
2 + (rail->rail * 2), 3, rail->mohm,
40 * 8);
}
int
nvkm_iccsense_read(struct nvkm_iccsense *iccsense, u8 idx)
{
struct nvkm_iccsense_rail *rail;
if (!iccsense || idx >= iccsense->rail_count)
return -EINVAL;
rail = &iccsense->rails[idx];
if (!rail->read)
return -ENODEV;
return rail->read(iccsense, rail);
}
int
nvkm_iccsense_read_all(struct nvkm_iccsense *iccsense)
{
int result = 0, i;
for (i = 0; i < iccsense->rail_count; ++i) {
int res = nvkm_iccsense_read(iccsense, i);
if (res >= 0)
result += res;
else
return res;
}
return result;
}
static void *
nvkm_iccsense_dtor(struct nvkm_subdev *subdev)
{
struct nvkm_iccsense *iccsense = nvkm_iccsense(subdev);
if (iccsense->rails)
kfree(iccsense->rails);
return iccsense;
}
static int
nvkm_iccsense_oneinit(struct nvkm_subdev *subdev)
{
struct nvkm_iccsense *iccsense = nvkm_iccsense(subdev);
struct nvkm_bios *bios = subdev->device->bios;
struct nvkm_i2c *i2c = subdev->device->i2c;
struct nvbios_iccsense stbl;
int i;
if (!i2c || !bios || nvbios_iccsense_parse(bios, &stbl)
|| !stbl.nr_entry)
return 0;
iccsense->rails = kmalloc(sizeof(*iccsense->rails) * stbl.nr_entry,
GFP_KERNEL);
if (!iccsense->rails)
return -ENOMEM;
iccsense->data_valid = true;
for (i = 0; i < stbl.nr_entry; ++i) {
struct pwr_rail_t *r = &stbl.rail[i];
struct nvbios_extdev_func extdev;
struct nvkm_iccsense_rail *rail;
struct nvkm_i2c_bus *i2c_bus;
u8 addr;
if (!r->mode || r->resistor_mohm == 0)
continue;
if (nvbios_extdev_parse(bios, r->extdev_id, &extdev))
continue;
if (extdev.type == 0xff)
continue;
if (extdev.bus)
i2c_bus = nvkm_i2c_bus_find(i2c, NVKM_I2C_BUS_SEC);
else
i2c_bus = nvkm_i2c_bus_find(i2c, NVKM_I2C_BUS_PRI);
if (!i2c_bus)
continue;
addr = extdev.addr >> 1;
if (!nvkm_iccsense_validate_device(&i2c_bus->i2c, addr,
extdev.type, r->rail)) {
iccsense->data_valid = false;
nvkm_warn(subdev, "found unknown or invalid rail entry"
" type 0x%x rail %i, power reading might be"
" invalid\n", extdev.type, r->rail);
continue;
}
rail = &iccsense->rails[iccsense->rail_count];
switch (extdev.type) {
case NVBIOS_EXTDEV_INA209:
rail->read = nvkm_iccsense_ina209_read;
break;
case NVBIOS_EXTDEV_INA219:
rail->read = nvkm_iccsense_ina219_read;
break;
case NVBIOS_EXTDEV_INA3221:
rail->read = nvkm_iccsense_ina3221_read;
break;
}
rail->addr = addr;
rail->rail = r->rail;
rail->mohm = r->resistor_mohm;
rail->i2c = &i2c_bus->i2c;
++iccsense->rail_count;
}
return 0;
}
struct nvkm_subdev_func iccsense_func = {
.oneinit = nvkm_iccsense_oneinit,
.dtor = nvkm_iccsense_dtor,
};
void
nvkm_iccsense_ctor(struct nvkm_device *device, int index,
struct nvkm_iccsense *iccsense)
{
nvkm_subdev_ctor(&iccsense_func, device, index, 0, &iccsense->subdev);
}
int
nvkm_iccsense_new_(struct nvkm_device *device, int index,
struct nvkm_iccsense **iccsense)
{
if (!(*iccsense = kzalloc(sizeof(**iccsense), GFP_KERNEL)))
return -ENOMEM;
nvkm_iccsense_ctor(device, index, *iccsense);
return 0;
}
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