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linux/drivers/macintosh/windfarm_fcu_controls.c
Uwe Kleine-König ed5c2f5fd1 i2c: Make remove callback return void 
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Windfarm PowerMac thermal control. FCU fan control
*
* Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
*/
#undef DEBUG
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/i2c.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include "windfarm.h"
#include "windfarm_mpu.h"
#define VERSION "1.0"
#ifdef DEBUG
#define DBG(args...) printk(args)
#else
#define DBG(args...) do { } while(0)
#endif
/*
* This option is "weird" :) Basically, if you define this to 1
* the control loop for the RPMs fans (not PWMs) will apply the
* correction factor obtained from the PID to the actual RPM
* speed read from the FCU.
*
* If you define the below constant to 0, then it will be
* applied to the setpoint RPM speed, that is basically the
* speed we proviously "asked" for.
*
* I'm using 0 for now which is what therm_pm72 used to do and
* what Darwin -apparently- does based on observed behaviour.
*/
#define RPM_PID_USE_ACTUAL_SPEED 0
/* Default min/max for pumps */
#define CPU_PUMP_OUTPUT_MAX 3200
#define CPU_PUMP_OUTPUT_MIN 1250
#define FCU_FAN_RPM 0
#define FCU_FAN_PWM 1
struct wf_fcu_priv {
struct kref ref;
struct i2c_client *i2c;
struct mutex lock;
struct list_head fan_list;
int rpm_shift;
};
struct wf_fcu_fan {
struct list_head link;
int id;
s32 min, max, target;
struct wf_fcu_priv *fcu_priv;
struct wf_control ctrl;
};
static void wf_fcu_release(struct kref *ref)
{
struct wf_fcu_priv *pv = container_of(ref, struct wf_fcu_priv, ref);
kfree(pv);
}
static void wf_fcu_fan_release(struct wf_control *ct)
{
struct wf_fcu_fan *fan = ct->priv;
kref_put(&fan->fcu_priv->ref, wf_fcu_release);
kfree(fan);
}
static int wf_fcu_read_reg(struct wf_fcu_priv *pv, int reg,
unsigned char *buf, int nb)
{
int tries, nr, nw;
mutex_lock(&pv->lock);
buf[0] = reg;
tries = 0;
for (;;) {
nw = i2c_master_send(pv->i2c, buf, 1);
if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
break;
msleep(10);
++tries;
}
if (nw <= 0) {
pr_err("Failure writing address to FCU: %d", nw);
nr = nw;
goto bail;
}
tries = 0;
for (;;) {
nr = i2c_master_recv(pv->i2c, buf, nb);
if (nr > 0 || (nr < 0 && nr != -ENODEV) || tries >= 100)
break;
msleep(10);
++tries;
}
if (nr <= 0)
pr_err("wf_fcu: Failure reading data from FCU: %d", nw);
bail:
mutex_unlock(&pv->lock);
return nr;
}
static int wf_fcu_write_reg(struct wf_fcu_priv *pv, int reg,
const unsigned char *ptr, int nb)
{
int tries, nw;
unsigned char buf[16];
buf[0] = reg;
memcpy(buf+1, ptr, nb);
++nb;
tries = 0;
for (;;) {
nw = i2c_master_send(pv->i2c, buf, nb);
if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
break;
msleep(10);
++tries;
}
if (nw < 0)
pr_err("wf_fcu: Failure writing to FCU: %d", nw);
return nw;
}
static int wf_fcu_fan_set_rpm(struct wf_control *ct, s32 value)
{
struct wf_fcu_fan *fan = ct->priv;
struct wf_fcu_priv *pv = fan->fcu_priv;
int rc, shift = pv->rpm_shift;
unsigned char buf[2];
if (value < fan->min)
value = fan->min;
if (value > fan->max)
value = fan->max;
fan->target = value;
buf[0] = value >> (8 - shift);
buf[1] = value << shift;
rc = wf_fcu_write_reg(pv, 0x10 + (fan->id * 2), buf, 2);
if (rc < 0)
return -EIO;
return 0;
}
static int wf_fcu_fan_get_rpm(struct wf_control *ct, s32 *value)
{
struct wf_fcu_fan *fan = ct->priv;
struct wf_fcu_priv *pv = fan->fcu_priv;
int rc, reg_base, shift = pv->rpm_shift;
unsigned char failure;
unsigned char active;
unsigned char buf[2];
rc = wf_fcu_read_reg(pv, 0xb, &failure, 1);
if (rc != 1)
return -EIO;
if ((failure & (1 << fan->id)) != 0)
return -EFAULT;
rc = wf_fcu_read_reg(pv, 0xd, &active, 1);
if (rc != 1)
return -EIO;
if ((active & (1 << fan->id)) == 0)
return -ENXIO;
/* Programmed value or real current speed */
#if RPM_PID_USE_ACTUAL_SPEED
reg_base = 0x11;
#else
reg_base = 0x10;
#endif
rc = wf_fcu_read_reg(pv, reg_base + (fan->id * 2), buf, 2);
if (rc != 2)
return -EIO;
*value = (buf[0] << (8 - shift)) | buf[1] >> shift;
return 0;
}
static int wf_fcu_fan_set_pwm(struct wf_control *ct, s32 value)
{
struct wf_fcu_fan *fan = ct->priv;
struct wf_fcu_priv *pv = fan->fcu_priv;
unsigned char buf[2];
int rc;
if (value < fan->min)
value = fan->min;
if (value > fan->max)
value = fan->max;
fan->target = value;
value = (value * 2559) / 1000;
buf[0] = value;
rc = wf_fcu_write_reg(pv, 0x30 + (fan->id * 2), buf, 1);
if (rc < 0)
return -EIO;
return 0;
}
static int wf_fcu_fan_get_pwm(struct wf_control *ct, s32 *value)
{
struct wf_fcu_fan *fan = ct->priv;
struct wf_fcu_priv *pv = fan->fcu_priv;
unsigned char failure;
unsigned char active;
unsigned char buf[2];
int rc;
rc = wf_fcu_read_reg(pv, 0x2b, &failure, 1);
if (rc != 1)
return -EIO;
if ((failure & (1 << fan->id)) != 0)
return -EFAULT;
rc = wf_fcu_read_reg(pv, 0x2d, &active, 1);
if (rc != 1)
return -EIO;
if ((active & (1 << fan->id)) == 0)
return -ENXIO;
rc = wf_fcu_read_reg(pv, 0x30 + (fan->id * 2), buf, 1);
if (rc != 1)
return -EIO;
*value = (((s32)buf[0]) * 1000) / 2559;
return 0;
}
static s32 wf_fcu_fan_min(struct wf_control *ct)
{
struct wf_fcu_fan *fan = ct->priv;
return fan->min;
}
static s32 wf_fcu_fan_max(struct wf_control *ct)
{
struct wf_fcu_fan *fan = ct->priv;
return fan->max;
}
static const struct wf_control_ops wf_fcu_fan_rpm_ops = {
.set_value = wf_fcu_fan_set_rpm,
.get_value = wf_fcu_fan_get_rpm,
.get_min = wf_fcu_fan_min,
.get_max = wf_fcu_fan_max,
.release = wf_fcu_fan_release,
.owner = THIS_MODULE,
};
static const struct wf_control_ops wf_fcu_fan_pwm_ops = {
.set_value = wf_fcu_fan_set_pwm,
.get_value = wf_fcu_fan_get_pwm,
.get_min = wf_fcu_fan_min,
.get_max = wf_fcu_fan_max,
.release = wf_fcu_fan_release,
.owner = THIS_MODULE,
};
static void wf_fcu_get_pump_minmax(struct wf_fcu_fan *fan)
{
const struct mpu_data *mpu = wf_get_mpu(0);
u16 pump_min = 0, pump_max = 0xffff;
u16 tmp[4];
/* Try to fetch pumps min/max infos from eeprom */
if (mpu) {
memcpy(&tmp, mpu->processor_part_num, 8);
if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
pump_min = max(pump_min, tmp[0]);
pump_max = min(pump_max, tmp[1]);
}
if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
pump_min = max(pump_min, tmp[2]);
pump_max = min(pump_max, tmp[3]);
}
}
/* Double check the values, this _IS_ needed as the EEPROM on
* some dual 2.5Ghz G5s seem, at least, to have both min & max
* same to the same value ... (grrrr)
*/
if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
pump_min = CPU_PUMP_OUTPUT_MIN;
pump_max = CPU_PUMP_OUTPUT_MAX;
}
fan->min = pump_min;
fan->max = pump_max;
DBG("wf_fcu: pump min/max for %s set to: [%d..%d] RPM\n",
fan->ctrl.name, pump_min, pump_max);
}
static void wf_fcu_get_rpmfan_minmax(struct wf_fcu_fan *fan)
{
struct wf_fcu_priv *pv = fan->fcu_priv;
const struct mpu_data *mpu0 = wf_get_mpu(0);
const struct mpu_data *mpu1 = wf_get_mpu(1);
/* Default */
fan->min = 2400 >> pv->rpm_shift;
fan->max = 56000 >> pv->rpm_shift;
/* CPU fans have min/max in MPU */
if (mpu0 && !strcmp(fan->ctrl.name, "cpu-front-fan-0")) {
fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan);
fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan);
goto bail;
}
if (mpu1 && !strcmp(fan->ctrl.name, "cpu-front-fan-1")) {
fan->min = max(fan->min, (s32)mpu1->rminn_intake_fan);
fan->max = min(fan->max, (s32)mpu1->rmaxn_intake_fan);
goto bail;
}
if (mpu0 && !strcmp(fan->ctrl.name, "cpu-rear-fan-0")) {
fan->min = max(fan->min, (s32)mpu0->rminn_exhaust_fan);
fan->max = min(fan->max, (s32)mpu0->rmaxn_exhaust_fan);
goto bail;
}
if (mpu1 && !strcmp(fan->ctrl.name, "cpu-rear-fan-1")) {
fan->min = max(fan->min, (s32)mpu1->rminn_exhaust_fan);
fan->max = min(fan->max, (s32)mpu1->rmaxn_exhaust_fan);
goto bail;
}
/* Rackmac variants, we just use mpu0 intake */
if (!strncmp(fan->ctrl.name, "cpu-fan", 7)) {
fan->min = max(fan->min, (s32)mpu0->rminn_intake_fan);
fan->max = min(fan->max, (s32)mpu0->rmaxn_intake_fan);
goto bail;
}
bail:
DBG("wf_fcu: fan min/max for %s set to: [%d..%d] RPM\n",
fan->ctrl.name, fan->min, fan->max);
}
static void wf_fcu_add_fan(struct wf_fcu_priv *pv, const char *name,
int type, int id)
{
struct wf_fcu_fan *fan;
fan = kzalloc(sizeof(*fan), GFP_KERNEL);
if (!fan)
return;
fan->fcu_priv = pv;
fan->id = id;
fan->ctrl.name = name;
fan->ctrl.priv = fan;
/* min/max is oddball but the code comes from
* therm_pm72 which seems to work so ...
*/
if (type == FCU_FAN_RPM) {
if (!strncmp(name, "cpu-pump", strlen("cpu-pump")))
wf_fcu_get_pump_minmax(fan);
else
wf_fcu_get_rpmfan_minmax(fan);
fan->ctrl.type = WF_CONTROL_RPM_FAN;
fan->ctrl.ops = &wf_fcu_fan_rpm_ops;
} else {
fan->min = 10;
fan->max = 100;
fan->ctrl.type = WF_CONTROL_PWM_FAN;
fan->ctrl.ops = &wf_fcu_fan_pwm_ops;
}
if (wf_register_control(&fan->ctrl)) {
pr_err("wf_fcu: Failed to register fan %s\n", name);
kfree(fan);
return;
}
list_add(&fan->link, &pv->fan_list);
kref_get(&pv->ref);
}
static void wf_fcu_lookup_fans(struct wf_fcu_priv *pv)
{
/* Translation of device-tree location properties to
* windfarm fan names
*/
static const struct {
const char *dt_name; /* Device-tree name */
const char *ct_name; /* Control name */
} loc_trans[] = {
{ "BACKSIDE", "backside-fan", },
{ "SYS CTRLR FAN", "backside-fan", },
{ "DRIVE BAY", "drive-bay-fan", },
{ "SLOT", "slots-fan", },
{ "PCI FAN", "slots-fan", },
{ "CPU A INTAKE", "cpu-front-fan-0", },
{ "CPU A EXHAUST", "cpu-rear-fan-0", },
{ "CPU B INTAKE", "cpu-front-fan-1", },
{ "CPU B EXHAUST", "cpu-rear-fan-1", },
{ "CPU A PUMP", "cpu-pump-0", },
{ "CPU B PUMP", "cpu-pump-1", },
{ "CPU A 1", "cpu-fan-a-0", },
{ "CPU A 2", "cpu-fan-b-0", },
{ "CPU A 3", "cpu-fan-c-0", },
{ "CPU B 1", "cpu-fan-a-1", },
{ "CPU B 2", "cpu-fan-b-1", },
{ "CPU B 3", "cpu-fan-c-1", },
};
struct device_node *np, *fcu = pv->i2c->dev.of_node;
int i;
DBG("Looking up FCU controls in device-tree...\n");
for_each_child_of_node(fcu, np) {
int id, type = -1;
const char *loc;
const char *name;
const u32 *reg;
DBG(" control: %pOFn, type: %s\n", np, of_node_get_device_type(np));
/* Detect control type */
if (of_node_is_type(np, "fan-rpm-control") ||
of_node_is_type(np, "fan-rpm"))
type = FCU_FAN_RPM;
if (of_node_is_type(np, "fan-pwm-control") ||
of_node_is_type(np, "fan-pwm"))
type = FCU_FAN_PWM;
/* Only care about fans for now */
if (type == -1)
continue;
/* Lookup for a matching location */
loc = of_get_property(np, "location", NULL);
reg = of_get_property(np, "reg", NULL);
if (loc == NULL || reg == NULL)
continue;
DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
for (i = 0; i < ARRAY_SIZE(loc_trans); i++) {
if (strncmp(loc, loc_trans[i].dt_name,
strlen(loc_trans[i].dt_name)))
continue;
name = loc_trans[i].ct_name;
DBG(" location match, name: %s\n", name);
if (type == FCU_FAN_RPM)
id = ((*reg) - 0x10) / 2;
else
id = ((*reg) - 0x30) / 2;
if (id > 7) {
pr_warn("wf_fcu: Can't parse fan ID in device-tree for %pOF\n", np);
break;
}
wf_fcu_add_fan(pv, name, type, id);
break;
}
}
}
static void wf_fcu_default_fans(struct wf_fcu_priv *pv)
{
/* We only support the default fans for PowerMac7,2 */
if (!of_machine_is_compatible("PowerMac7,2"))
return;
wf_fcu_add_fan(pv, "backside-fan", FCU_FAN_PWM, 1);
wf_fcu_add_fan(pv, "drive-bay-fan", FCU_FAN_RPM, 2);
wf_fcu_add_fan(pv, "slots-fan", FCU_FAN_PWM, 2);
wf_fcu_add_fan(pv, "cpu-front-fan-0", FCU_FAN_RPM, 3);
wf_fcu_add_fan(pv, "cpu-rear-fan-0", FCU_FAN_RPM, 4);
wf_fcu_add_fan(pv, "cpu-front-fan-1", FCU_FAN_RPM, 5);
wf_fcu_add_fan(pv, "cpu-rear-fan-1", FCU_FAN_RPM, 6);
}
static int wf_fcu_init_chip(struct wf_fcu_priv *pv)
{
unsigned char buf = 0xff;
int rc;
rc = wf_fcu_write_reg(pv, 0xe, &buf, 1);
if (rc < 0)
return -EIO;
rc = wf_fcu_write_reg(pv, 0x2e, &buf, 1);
if (rc < 0)
return -EIO;
rc = wf_fcu_read_reg(pv, 0, &buf, 1);
if (rc < 0)
return -EIO;
pv->rpm_shift = (buf == 1) ? 2 : 3;
pr_debug("wf_fcu: FCU Initialized, RPM fan shift is %d\n",
pv->rpm_shift);
return 0;
}
static int wf_fcu_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct wf_fcu_priv *pv;
pv = kzalloc(sizeof(*pv), GFP_KERNEL);
if (!pv)
return -ENOMEM;
kref_init(&pv->ref);
mutex_init(&pv->lock);
INIT_LIST_HEAD(&pv->fan_list);
pv->i2c = client;
/*
* First we must start the FCU which will query the
* shift value to apply to RPMs
*/
if (wf_fcu_init_chip(pv)) {
pr_err("wf_fcu: Initialization failed !\n");
kfree(pv);
return -ENXIO;
}
/* First lookup fans in the device-tree */
wf_fcu_lookup_fans(pv);
/*
* Older machines don't have the device-tree entries
* we are looking for, just hard code the list
*/
if (list_empty(&pv->fan_list))
wf_fcu_default_fans(pv);
/* Still no fans ? FAIL */
if (list_empty(&pv->fan_list)) {
pr_err("wf_fcu: Failed to find fans for your machine\n");
kfree(pv);
return -ENODEV;
}
dev_set_drvdata(&client->dev, pv);
return 0;
}
static void wf_fcu_remove(struct i2c_client *client)
{
struct wf_fcu_priv *pv = dev_get_drvdata(&client->dev);
struct wf_fcu_fan *fan;
while (!list_empty(&pv->fan_list)) {
fan = list_first_entry(&pv->fan_list, struct wf_fcu_fan, link);
list_del(&fan->link);
wf_unregister_control(&fan->ctrl);
}
kref_put(&pv->ref, wf_fcu_release);
}
static const struct i2c_device_id wf_fcu_id[] = {
{ "MAC,fcu", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wf_fcu_id);
static const struct of_device_id wf_fcu_of_id[] = {
{ .compatible = "fcu", },
{ }
};
MODULE_DEVICE_TABLE(of, wf_fcu_of_id);
static struct i2c_driver wf_fcu_driver = {
.driver = {
.name = "wf_fcu",
.of_match_table = wf_fcu_of_id,
},
.probe = wf_fcu_probe,
.remove = wf_fcu_remove,
.id_table = wf_fcu_id,
};
module_i2c_driver(wf_fcu_driver);
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("FCU control objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");
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