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linux/drivers/hwmon/vt1211.c
Uwe Kleine-König 6e4c7bafcd hwmon: (vt1211) Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230918085951.1234172-21-u.kleine-koenig@pengutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2023-10-27 07:27:25 -07:00

1360 lines
37 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* vt1211.c - driver for the VIA VT1211 Super-I/O chip integrated hardware
* monitoring features
* Copyright (C) 2006 Juerg Haefliger <juergh@gmail.com>
*
* This driver is based on the driver for kernel 2.4 by Mark D. Studebaker
* and its port to kernel 2.6 by Lars Ekman.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/io.h>
static int uch_config = -1;
module_param(uch_config, int, 0);
MODULE_PARM_DESC(uch_config, "Initialize the universal channel configuration");
static int int_mode = -1;
module_param(int_mode, int, 0);
MODULE_PARM_DESC(int_mode, "Force the temperature interrupt mode");
static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
static struct platform_device *pdev;
#define DRVNAME "vt1211"
/* ---------------------------------------------------------------------
* Registers
*
* The sensors are defined as follows.
*
* Sensor Voltage Mode Temp Mode Notes (from the datasheet)
* -------- ------------ --------- --------------------------
* Reading 1 temp1 Intel thermal diode
* Reading 3 temp2 Internal thermal diode
* UCH1/Reading2 in0 temp3 NTC type thermistor
* UCH2 in1 temp4 +2.5V
* UCH3 in2 temp5 VccP
* UCH4 in3 temp6 +5V
* UCH5 in4 temp7 +12V
* 3.3V in5 Internal VDD (+3.3V)
*
* --------------------------------------------------------------------- */
/* Voltages (in) numbered 0-5 (ix) */
#define VT1211_REG_IN(ix) (0x21 + (ix))
#define VT1211_REG_IN_MIN(ix) ((ix) == 0 ? 0x3e : 0x2a + 2 * (ix))
#define VT1211_REG_IN_MAX(ix) ((ix) == 0 ? 0x3d : 0x29 + 2 * (ix))
/* Temperatures (temp) numbered 0-6 (ix) */
static u8 regtemp[] = {0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25};
static u8 regtempmax[] = {0x39, 0x1d, 0x3d, 0x2b, 0x2d, 0x2f, 0x31};
static u8 regtemphyst[] = {0x3a, 0x1e, 0x3e, 0x2c, 0x2e, 0x30, 0x32};
/* Fans numbered 0-1 (ix) */
#define VT1211_REG_FAN(ix) (0x29 + (ix))
#define VT1211_REG_FAN_MIN(ix) (0x3b + (ix))
#define VT1211_REG_FAN_DIV 0x47
/* PWMs numbered 0-1 (ix) */
/* Auto points numbered 0-3 (ap) */
#define VT1211_REG_PWM(ix) (0x60 + (ix))
#define VT1211_REG_PWM_CLK 0x50
#define VT1211_REG_PWM_CTL 0x51
#define VT1211_REG_PWM_AUTO_TEMP(ap) (0x55 - (ap))
#define VT1211_REG_PWM_AUTO_PWM(ix, ap) (0x58 + 2 * (ix) - (ap))
/* Miscellaneous registers */
#define VT1211_REG_CONFIG 0x40
#define VT1211_REG_ALARM1 0x41
#define VT1211_REG_ALARM2 0x42
#define VT1211_REG_VID 0x45
#define VT1211_REG_UCH_CONFIG 0x4a
#define VT1211_REG_TEMP1_CONFIG 0x4b
#define VT1211_REG_TEMP2_CONFIG 0x4c
/* In, temp & fan alarm bits */
static const u8 bitalarmin[] = {11, 0, 1, 3, 8, 2, 9};
static const u8 bitalarmtemp[] = {4, 15, 11, 0, 1, 3, 8};
static const u8 bitalarmfan[] = {6, 7};
/* ---------------------------------------------------------------------
* Data structures and manipulation thereof
* --------------------------------------------------------------------- */
struct vt1211_data {
unsigned short addr;
const char *name;
struct device *hwmon_dev;
struct mutex update_lock;
bool valid; /* true if following fields are valid */
unsigned long last_updated; /* In jiffies */
/* Register values */
u8 in[6];
u8 in_max[6];
u8 in_min[6];
u8 temp[7];
u8 temp_max[7];
u8 temp_hyst[7];
u8 fan[2];
u8 fan_min[2];
u8 fan_div[2];
u8 fan_ctl;
u8 pwm[2];
u8 pwm_ctl[2];
u8 pwm_clk;
u8 pwm_auto_temp[4];
u8 pwm_auto_pwm[2][4];
u8 vid; /* Read once at init time */
u8 vrm;
u8 uch_config; /* Read once at init time */
u16 alarms;
};
/* ix = [0-5] */
#define ISVOLT(ix, uch_config) ((ix) > 4 ? 1 : \
!(((uch_config) >> ((ix) + 2)) & 1))
/* ix = [0-6] */
#define ISTEMP(ix, uch_config) ((ix) < 2 ? 1 : \
((uch_config) >> (ix)) & 1)
/*
* in5 (ix = 5) is special. It's the internal 3.3V so it's scaled in the
* driver according to the VT1211 BIOS porting guide
*/
#define IN_FROM_REG(ix, reg) ((reg) < 3 ? 0 : (ix) == 5 ? \
(((reg) - 3) * 15882 + 479) / 958 : \
(((reg) - 3) * 10000 + 479) / 958)
#define IN_TO_REG(ix, val) (clamp_val((ix) == 5 ? \
((val) * 958 + 7941) / 15882 + 3 : \
((val) * 958 + 5000) / 10000 + 3, 0, 255))
/*
* temp1 (ix = 0) is an intel thermal diode which is scaled in user space.
* temp2 (ix = 1) is the internal temp diode so it's scaled in the driver
* according to some measurements that I took on an EPIA M10000.
* temp3-7 are thermistor based so the driver returns the voltage measured at
* the pin (range 0V - 2.2V).
*/
#define TEMP_FROM_REG(ix, reg) ((ix) == 0 ? (reg) * 1000 : \
(ix) == 1 ? (reg) < 51 ? 0 : \
((reg) - 51) * 1000 : \
((253 - (reg)) * 2200 + 105) / 210)
#define TEMP_TO_REG(ix, val) clamp_val( \
((ix) == 0 ? ((val) + 500) / 1000 : \
(ix) == 1 ? ((val) + 500) / 1000 + 51 : \
253 - ((val) * 210 + 1100) / 2200), 0, 255)
#define DIV_FROM_REG(reg) (1 << (reg))
#define RPM_FROM_REG(reg, div) (((reg) == 0) || ((reg) == 255) ? 0 : \
1310720 / (reg) / DIV_FROM_REG(div))
#define RPM_TO_REG(val, div) ((val) == 0 ? 255 : \
clamp_val((1310720 / (val) / \
DIV_FROM_REG(div)), 1, 254))
/* ---------------------------------------------------------------------
* Super-I/O constants and functions
* --------------------------------------------------------------------- */
/*
* Configuration index port registers
* The vt1211 can live at 2 different addresses so we need to probe both
*/
#define SIO_REG_CIP1 0x2e
#define SIO_REG_CIP2 0x4e
/* Configuration registers */
#define SIO_VT1211_LDN 0x07 /* logical device number */
#define SIO_VT1211_DEVID 0x20 /* device ID */
#define SIO_VT1211_DEVREV 0x21 /* device revision */
#define SIO_VT1211_ACTIVE 0x30 /* HW monitor active */
#define SIO_VT1211_BADDR 0x60 /* base I/O address */
#define SIO_VT1211_ID 0x3c /* VT1211 device ID */
/* VT1211 logical device numbers */
#define SIO_VT1211_LDN_HWMON 0x0b /* HW monitor */
static inline int superio_inb(int sio_cip, int reg)
{
outb(reg, sio_cip);
return inb(sio_cip + 1);
}
static inline void superio_select(int sio_cip, int ldn)
{
outb(SIO_VT1211_LDN, sio_cip);
outb(ldn, sio_cip + 1);
}
static inline int superio_enter(int sio_cip)
{
if (!request_muxed_region(sio_cip, 2, DRVNAME))
return -EBUSY;
outb(0x87, sio_cip);
outb(0x87, sio_cip);
return 0;
}
static inline void superio_exit(int sio_cip)
{
outb(0xaa, sio_cip);
release_region(sio_cip, 2);
}
/* ---------------------------------------------------------------------
* Device I/O access
* --------------------------------------------------------------------- */
static inline u8 vt1211_read8(struct vt1211_data *data, u8 reg)
{
return inb(data->addr + reg);
}
static inline void vt1211_write8(struct vt1211_data *data, u8 reg, u8 val)
{
outb(val, data->addr + reg);
}
static struct vt1211_data *vt1211_update_device(struct device *dev)
{
struct vt1211_data *data = dev_get_drvdata(dev);
int ix, val;
mutex_lock(&data->update_lock);
/* registers cache is refreshed after 1 second */
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
/* read VID */
data->vid = vt1211_read8(data, VT1211_REG_VID) & 0x1f;
/* voltage (in) registers */
for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
if (ISVOLT(ix, data->uch_config)) {
data->in[ix] = vt1211_read8(data,
VT1211_REG_IN(ix));
data->in_min[ix] = vt1211_read8(data,
VT1211_REG_IN_MIN(ix));
data->in_max[ix] = vt1211_read8(data,
VT1211_REG_IN_MAX(ix));
}
}
/* temp registers */
for (ix = 0; ix < ARRAY_SIZE(data->temp); ix++) {
if (ISTEMP(ix, data->uch_config)) {
data->temp[ix] = vt1211_read8(data,
regtemp[ix]);
data->temp_max[ix] = vt1211_read8(data,
regtempmax[ix]);
data->temp_hyst[ix] = vt1211_read8(data,
regtemphyst[ix]);
}
}
/* fan & pwm registers */
for (ix = 0; ix < ARRAY_SIZE(data->fan); ix++) {
data->fan[ix] = vt1211_read8(data,
VT1211_REG_FAN(ix));
data->fan_min[ix] = vt1211_read8(data,
VT1211_REG_FAN_MIN(ix));
data->pwm[ix] = vt1211_read8(data,
VT1211_REG_PWM(ix));
}
val = vt1211_read8(data, VT1211_REG_FAN_DIV);
data->fan_div[0] = (val >> 4) & 3;
data->fan_div[1] = (val >> 6) & 3;
data->fan_ctl = val & 0xf;
val = vt1211_read8(data, VT1211_REG_PWM_CTL);
data->pwm_ctl[0] = val & 0xf;
data->pwm_ctl[1] = (val >> 4) & 0xf;
data->pwm_clk = vt1211_read8(data, VT1211_REG_PWM_CLK);
/* pwm & temp auto point registers */
data->pwm_auto_pwm[0][1] = vt1211_read8(data,
VT1211_REG_PWM_AUTO_PWM(0, 1));
data->pwm_auto_pwm[0][2] = vt1211_read8(data,
VT1211_REG_PWM_AUTO_PWM(0, 2));
data->pwm_auto_pwm[1][1] = vt1211_read8(data,
VT1211_REG_PWM_AUTO_PWM(1, 1));
data->pwm_auto_pwm[1][2] = vt1211_read8(data,
VT1211_REG_PWM_AUTO_PWM(1, 2));
for (ix = 0; ix < ARRAY_SIZE(data->pwm_auto_temp); ix++) {
data->pwm_auto_temp[ix] = vt1211_read8(data,
VT1211_REG_PWM_AUTO_TEMP(ix));
}
/* alarm registers */
data->alarms = (vt1211_read8(data, VT1211_REG_ALARM2) << 8) |
vt1211_read8(data, VT1211_REG_ALARM1);
data->last_updated = jiffies;
data->valid = true;
}
mutex_unlock(&data->update_lock);
return data;
}
/* ---------------------------------------------------------------------
* Voltage sysfs interfaces
* ix = [0-5]
* --------------------------------------------------------------------- */
#define SHOW_IN_INPUT 0
#define SHOW_SET_IN_MIN 1
#define SHOW_SET_IN_MAX 2
#define SHOW_IN_ALARM 3
static ssize_t show_in(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int res;
switch (fn) {
case SHOW_IN_INPUT:
res = IN_FROM_REG(ix, data->in[ix]);
break;
case SHOW_SET_IN_MIN:
res = IN_FROM_REG(ix, data->in_min[ix]);
break;
case SHOW_SET_IN_MAX:
res = IN_FROM_REG(ix, data->in_max[ix]);
break;
case SHOW_IN_ALARM:
res = (data->alarms >> bitalarmin[ix]) & 1;
break;
default:
res = 0;
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
return sprintf(buf, "%d\n", res);
}
static ssize_t set_in(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
switch (fn) {
case SHOW_SET_IN_MIN:
data->in_min[ix] = IN_TO_REG(ix, val);
vt1211_write8(data, VT1211_REG_IN_MIN(ix), data->in_min[ix]);
break;
case SHOW_SET_IN_MAX:
data->in_max[ix] = IN_TO_REG(ix, val);
vt1211_write8(data, VT1211_REG_IN_MAX(ix), data->in_max[ix]);
break;
default:
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
mutex_unlock(&data->update_lock);
return count;
}
/* ---------------------------------------------------------------------
* Temperature sysfs interfaces
* ix = [0-6]
* --------------------------------------------------------------------- */
#define SHOW_TEMP_INPUT 0
#define SHOW_SET_TEMP_MAX 1
#define SHOW_SET_TEMP_MAX_HYST 2
#define SHOW_TEMP_ALARM 3
static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int res;
switch (fn) {
case SHOW_TEMP_INPUT:
res = TEMP_FROM_REG(ix, data->temp[ix]);
break;
case SHOW_SET_TEMP_MAX:
res = TEMP_FROM_REG(ix, data->temp_max[ix]);
break;
case SHOW_SET_TEMP_MAX_HYST:
res = TEMP_FROM_REG(ix, data->temp_hyst[ix]);
break;
case SHOW_TEMP_ALARM:
res = (data->alarms >> bitalarmtemp[ix]) & 1;
break;
default:
res = 0;
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
return sprintf(buf, "%d\n", res);
}
static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
switch (fn) {
case SHOW_SET_TEMP_MAX:
data->temp_max[ix] = TEMP_TO_REG(ix, val);
vt1211_write8(data, regtempmax[ix],
data->temp_max[ix]);
break;
case SHOW_SET_TEMP_MAX_HYST:
data->temp_hyst[ix] = TEMP_TO_REG(ix, val);
vt1211_write8(data, regtemphyst[ix],
data->temp_hyst[ix]);
break;
default:
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
mutex_unlock(&data->update_lock);
return count;
}
/* ---------------------------------------------------------------------
* Fan sysfs interfaces
* ix = [0-1]
* --------------------------------------------------------------------- */
#define SHOW_FAN_INPUT 0
#define SHOW_SET_FAN_MIN 1
#define SHOW_SET_FAN_DIV 2
#define SHOW_FAN_ALARM 3
static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int res;
switch (fn) {
case SHOW_FAN_INPUT:
res = RPM_FROM_REG(data->fan[ix], data->fan_div[ix]);
break;
case SHOW_SET_FAN_MIN:
res = RPM_FROM_REG(data->fan_min[ix], data->fan_div[ix]);
break;
case SHOW_SET_FAN_DIV:
res = DIV_FROM_REG(data->fan_div[ix]);
break;
case SHOW_FAN_ALARM:
res = (data->alarms >> bitalarmfan[ix]) & 1;
break;
default:
res = 0;
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
return sprintf(buf, "%d\n", res);
}
static ssize_t set_fan(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int reg;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
/* sync the data cache */
reg = vt1211_read8(data, VT1211_REG_FAN_DIV);
data->fan_div[0] = (reg >> 4) & 3;
data->fan_div[1] = (reg >> 6) & 3;
data->fan_ctl = reg & 0xf;
switch (fn) {
case SHOW_SET_FAN_MIN:
data->fan_min[ix] = RPM_TO_REG(val, data->fan_div[ix]);
vt1211_write8(data, VT1211_REG_FAN_MIN(ix),
data->fan_min[ix]);
break;
case SHOW_SET_FAN_DIV:
switch (val) {
case 1:
data->fan_div[ix] = 0;
break;
case 2:
data->fan_div[ix] = 1;
break;
case 4:
data->fan_div[ix] = 2;
break;
case 8:
data->fan_div[ix] = 3;
break;
default:
count = -EINVAL;
dev_warn(dev,
"fan div value %ld not supported. Choose one of 1, 2, 4, or 8.\n",
val);
goto EXIT;
}
vt1211_write8(data, VT1211_REG_FAN_DIV,
((data->fan_div[1] << 6) |
(data->fan_div[0] << 4) |
data->fan_ctl));
break;
default:
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
EXIT:
mutex_unlock(&data->update_lock);
return count;
}
/* ---------------------------------------------------------------------
* PWM sysfs interfaces
* ix = [0-1]
* --------------------------------------------------------------------- */
#define SHOW_PWM 0
#define SHOW_SET_PWM_ENABLE 1
#define SHOW_SET_PWM_FREQ 2
#define SHOW_SET_PWM_AUTO_CHANNELS_TEMP 3
static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int res;
switch (fn) {
case SHOW_PWM:
res = data->pwm[ix];
break;
case SHOW_SET_PWM_ENABLE:
res = ((data->pwm_ctl[ix] >> 3) & 1) ? 2 : 0;
break;
case SHOW_SET_PWM_FREQ:
res = 90000 >> (data->pwm_clk & 7);
break;
case SHOW_SET_PWM_AUTO_CHANNELS_TEMP:
res = (data->pwm_ctl[ix] & 7) + 1;
break;
default:
res = 0;
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
return sprintf(buf, "%d\n", res);
}
static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int fn = sensor_attr_2->nr;
int tmp, reg;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
switch (fn) {
case SHOW_SET_PWM_ENABLE:
/* sync the data cache */
reg = vt1211_read8(data, VT1211_REG_FAN_DIV);
data->fan_div[0] = (reg >> 4) & 3;
data->fan_div[1] = (reg >> 6) & 3;
data->fan_ctl = reg & 0xf;
reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
data->pwm_ctl[0] = reg & 0xf;
data->pwm_ctl[1] = (reg >> 4) & 0xf;
switch (val) {
case 0:
data->pwm_ctl[ix] &= 7;
/*
* disable SmartGuardian if both PWM outputs are
* disabled
*/
if ((data->pwm_ctl[ix ^ 1] & 1) == 0)
data->fan_ctl &= 0xe;
break;
case 2:
data->pwm_ctl[ix] |= 8;
data->fan_ctl |= 1;
break;
default:
count = -EINVAL;
dev_warn(dev,
"pwm mode %ld not supported. Choose one of 0 or 2.\n",
val);
goto EXIT;
}
vt1211_write8(data, VT1211_REG_PWM_CTL,
((data->pwm_ctl[1] << 4) |
data->pwm_ctl[0]));
vt1211_write8(data, VT1211_REG_FAN_DIV,
((data->fan_div[1] << 6) |
(data->fan_div[0] << 4) |
data->fan_ctl));
break;
case SHOW_SET_PWM_FREQ:
val = 135000 / clamp_val(val, 135000 >> 7, 135000);
/* calculate tmp = log2(val) */
tmp = 0;
for (val >>= 1; val > 0; val >>= 1)
tmp++;
/* sync the data cache */
reg = vt1211_read8(data, VT1211_REG_PWM_CLK);
data->pwm_clk = (reg & 0xf8) | tmp;
vt1211_write8(data, VT1211_REG_PWM_CLK, data->pwm_clk);
break;
case SHOW_SET_PWM_AUTO_CHANNELS_TEMP:
if (val < 1 || val > 7) {
count = -EINVAL;
dev_warn(dev,
"temp channel %ld not supported. Choose a value between 1 and 7.\n",
val);
goto EXIT;
}
if (!ISTEMP(val - 1, data->uch_config)) {
count = -EINVAL;
dev_warn(dev, "temp channel %ld is not available.\n",
val);
goto EXIT;
}
/* sync the data cache */
reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
data->pwm_ctl[0] = reg & 0xf;
data->pwm_ctl[1] = (reg >> 4) & 0xf;
data->pwm_ctl[ix] = (data->pwm_ctl[ix] & 8) | (val - 1);
vt1211_write8(data, VT1211_REG_PWM_CTL,
((data->pwm_ctl[1] << 4) | data->pwm_ctl[0]));
break;
default:
dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
}
EXIT:
mutex_unlock(&data->update_lock);
return count;
}
/* ---------------------------------------------------------------------
* PWM auto point definitions
* ix = [0-1]
* ap = [0-3]
* --------------------------------------------------------------------- */
/*
* pwm[ix+1]_auto_point[ap+1]_temp mapping table:
* Note that there is only a single set of temp auto points that controls both
* PWM controllers. We still create 2 sets of sysfs files to make it look
* more consistent even though they map to the same registers.
*
* ix ap : description
* -------------------
* 0 0 : pwm1/2 off temperature (pwm_auto_temp[0])
* 0 1 : pwm1/2 low speed temperature (pwm_auto_temp[1])
* 0 2 : pwm1/2 high speed temperature (pwm_auto_temp[2])
* 0 3 : pwm1/2 full speed temperature (pwm_auto_temp[3])
* 1 0 : pwm1/2 off temperature (pwm_auto_temp[0])
* 1 1 : pwm1/2 low speed temperature (pwm_auto_temp[1])
* 1 2 : pwm1/2 high speed temperature (pwm_auto_temp[2])
* 1 3 : pwm1/2 full speed temperature (pwm_auto_temp[3])
*/
static ssize_t show_pwm_auto_point_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int ap = sensor_attr_2->nr;
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->pwm_ctl[ix] & 7,
data->pwm_auto_temp[ap]));
}
static ssize_t set_pwm_auto_point_temp(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int ap = sensor_attr_2->nr;
int reg;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
/* sync the data cache */
reg = vt1211_read8(data, VT1211_REG_PWM_CTL);
data->pwm_ctl[0] = reg & 0xf;
data->pwm_ctl[1] = (reg >> 4) & 0xf;
data->pwm_auto_temp[ap] = TEMP_TO_REG(data->pwm_ctl[ix] & 7, val);
vt1211_write8(data, VT1211_REG_PWM_AUTO_TEMP(ap),
data->pwm_auto_temp[ap]);
mutex_unlock(&data->update_lock);
return count;
}
/*
* pwm[ix+1]_auto_point[ap+1]_pwm mapping table:
* Note that the PWM auto points 0 & 3 are hard-wired in the VT1211 and can't
* be changed.
*
* ix ap : description
* -------------------
* 0 0 : pwm1 off (pwm_auto_pwm[0][0], hard-wired to 0)
* 0 1 : pwm1 low speed duty cycle (pwm_auto_pwm[0][1])
* 0 2 : pwm1 high speed duty cycle (pwm_auto_pwm[0][2])
* 0 3 : pwm1 full speed (pwm_auto_pwm[0][3], hard-wired to 255)
* 1 0 : pwm2 off (pwm_auto_pwm[1][0], hard-wired to 0)
* 1 1 : pwm2 low speed duty cycle (pwm_auto_pwm[1][1])
* 1 2 : pwm2 high speed duty cycle (pwm_auto_pwm[1][2])
* 1 3 : pwm2 full speed (pwm_auto_pwm[1][3], hard-wired to 255)
*/
static ssize_t show_pwm_auto_point_pwm(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int ap = sensor_attr_2->nr;
return sprintf(buf, "%d\n", data->pwm_auto_pwm[ix][ap]);
}
static ssize_t set_pwm_auto_point_pwm(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute_2 *sensor_attr_2 =
to_sensor_dev_attr_2(attr);
int ix = sensor_attr_2->index;
int ap = sensor_attr_2->nr;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->pwm_auto_pwm[ix][ap] = clamp_val(val, 0, 255);
vt1211_write8(data, VT1211_REG_PWM_AUTO_PWM(ix, ap),
data->pwm_auto_pwm[ix][ap]);
mutex_unlock(&data->update_lock);
return count;
}
/* ---------------------------------------------------------------------
* Miscellaneous sysfs interfaces (VRM, VID, name, and (legacy) alarms)
* --------------------------------------------------------------------- */
static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", data->vrm);
}
static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt1211_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
if (val > 255)
return -EINVAL;
data->vrm = val;
return count;
}
static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt1211_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static ssize_t show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vt1211_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);
}
static ssize_t show_alarms(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vt1211_data *data = vt1211_update_device(dev);
return sprintf(buf, "%d\n", data->alarms);
}
/* ---------------------------------------------------------------------
* Device attribute structs
* --------------------------------------------------------------------- */
#define SENSOR_ATTR_IN(ix) \
{ SENSOR_ATTR_2(in##ix##_input, S_IRUGO, \
show_in, NULL, SHOW_IN_INPUT, ix), \
SENSOR_ATTR_2(in##ix##_min, S_IRUGO | S_IWUSR, \
show_in, set_in, SHOW_SET_IN_MIN, ix), \
SENSOR_ATTR_2(in##ix##_max, S_IRUGO | S_IWUSR, \
show_in, set_in, SHOW_SET_IN_MAX, ix), \
SENSOR_ATTR_2(in##ix##_alarm, S_IRUGO, \
show_in, NULL, SHOW_IN_ALARM, ix) \
}
static struct sensor_device_attribute_2 vt1211_sysfs_in[][4] = {
SENSOR_ATTR_IN(0),
SENSOR_ATTR_IN(1),
SENSOR_ATTR_IN(2),
SENSOR_ATTR_IN(3),
SENSOR_ATTR_IN(4),
SENSOR_ATTR_IN(5)
};
#define IN_UNIT_ATTRS(X) \
{ &vt1211_sysfs_in[X][0].dev_attr.attr, \
&vt1211_sysfs_in[X][1].dev_attr.attr, \
&vt1211_sysfs_in[X][2].dev_attr.attr, \
&vt1211_sysfs_in[X][3].dev_attr.attr, \
NULL \
}
static struct attribute *vt1211_in_attr[][5] = {
IN_UNIT_ATTRS(0),
IN_UNIT_ATTRS(1),
IN_UNIT_ATTRS(2),
IN_UNIT_ATTRS(3),
IN_UNIT_ATTRS(4),
IN_UNIT_ATTRS(5)
};
static const struct attribute_group vt1211_in_attr_group[] = {
{ .attrs = vt1211_in_attr[0] },
{ .attrs = vt1211_in_attr[1] },
{ .attrs = vt1211_in_attr[2] },
{ .attrs = vt1211_in_attr[3] },
{ .attrs = vt1211_in_attr[4] },
{ .attrs = vt1211_in_attr[5] }
};
#define SENSOR_ATTR_TEMP(ix) \
{ SENSOR_ATTR_2(temp##ix##_input, S_IRUGO, \
show_temp, NULL, SHOW_TEMP_INPUT, ix-1), \
SENSOR_ATTR_2(temp##ix##_max, S_IRUGO | S_IWUSR, \
show_temp, set_temp, SHOW_SET_TEMP_MAX, ix-1), \
SENSOR_ATTR_2(temp##ix##_max_hyst, S_IRUGO | S_IWUSR, \
show_temp, set_temp, SHOW_SET_TEMP_MAX_HYST, ix-1), \
SENSOR_ATTR_2(temp##ix##_alarm, S_IRUGO, \
show_temp, NULL, SHOW_TEMP_ALARM, ix-1) \
}
static struct sensor_device_attribute_2 vt1211_sysfs_temp[][4] = {
SENSOR_ATTR_TEMP(1),
SENSOR_ATTR_TEMP(2),
SENSOR_ATTR_TEMP(3),
SENSOR_ATTR_TEMP(4),
SENSOR_ATTR_TEMP(5),
SENSOR_ATTR_TEMP(6),
SENSOR_ATTR_TEMP(7),
};
#define TEMP_UNIT_ATTRS(X) \
{ &vt1211_sysfs_temp[X][0].dev_attr.attr, \
&vt1211_sysfs_temp[X][1].dev_attr.attr, \
&vt1211_sysfs_temp[X][2].dev_attr.attr, \
&vt1211_sysfs_temp[X][3].dev_attr.attr, \
NULL \
}
static struct attribute *vt1211_temp_attr[][5] = {
TEMP_UNIT_ATTRS(0),
TEMP_UNIT_ATTRS(1),
TEMP_UNIT_ATTRS(2),
TEMP_UNIT_ATTRS(3),
TEMP_UNIT_ATTRS(4),
TEMP_UNIT_ATTRS(5),
TEMP_UNIT_ATTRS(6)
};
static const struct attribute_group vt1211_temp_attr_group[] = {
{ .attrs = vt1211_temp_attr[0] },
{ .attrs = vt1211_temp_attr[1] },
{ .attrs = vt1211_temp_attr[2] },
{ .attrs = vt1211_temp_attr[3] },
{ .attrs = vt1211_temp_attr[4] },
{ .attrs = vt1211_temp_attr[5] },
{ .attrs = vt1211_temp_attr[6] }
};
#define SENSOR_ATTR_FAN(ix) \
SENSOR_ATTR_2(fan##ix##_input, S_IRUGO, \
show_fan, NULL, SHOW_FAN_INPUT, ix-1), \
SENSOR_ATTR_2(fan##ix##_min, S_IRUGO | S_IWUSR, \
show_fan, set_fan, SHOW_SET_FAN_MIN, ix-1), \
SENSOR_ATTR_2(fan##ix##_div, S_IRUGO | S_IWUSR, \
show_fan, set_fan, SHOW_SET_FAN_DIV, ix-1), \
SENSOR_ATTR_2(fan##ix##_alarm, S_IRUGO, \
show_fan, NULL, SHOW_FAN_ALARM, ix-1)
#define SENSOR_ATTR_PWM(ix) \
SENSOR_ATTR_2(pwm##ix, S_IRUGO, \
show_pwm, NULL, SHOW_PWM, ix-1), \
SENSOR_ATTR_2(pwm##ix##_enable, S_IRUGO | S_IWUSR, \
show_pwm, set_pwm, SHOW_SET_PWM_ENABLE, ix-1), \
SENSOR_ATTR_2(pwm##ix##_auto_channels_temp, S_IRUGO | S_IWUSR, \
show_pwm, set_pwm, SHOW_SET_PWM_AUTO_CHANNELS_TEMP, ix-1)
#define SENSOR_ATTR_PWM_FREQ(ix) \
SENSOR_ATTR_2(pwm##ix##_freq, S_IRUGO | S_IWUSR, \
show_pwm, set_pwm, SHOW_SET_PWM_FREQ, ix-1)
#define SENSOR_ATTR_PWM_FREQ_RO(ix) \
SENSOR_ATTR_2(pwm##ix##_freq, S_IRUGO, \
show_pwm, NULL, SHOW_SET_PWM_FREQ, ix-1)
#define SENSOR_ATTR_PWM_AUTO_POINT_TEMP(ix, ap) \
SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_temp, S_IRUGO | S_IWUSR, \
show_pwm_auto_point_temp, set_pwm_auto_point_temp, \
ap-1, ix-1)
#define SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(ix, ap) \
SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_temp, S_IRUGO, \
show_pwm_auto_point_temp, NULL, \
ap-1, ix-1)
#define SENSOR_ATTR_PWM_AUTO_POINT_PWM(ix, ap) \
SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_pwm, S_IRUGO | S_IWUSR, \
show_pwm_auto_point_pwm, set_pwm_auto_point_pwm, \
ap-1, ix-1)
#define SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(ix, ap) \
SENSOR_ATTR_2(pwm##ix##_auto_point##ap##_pwm, S_IRUGO, \
show_pwm_auto_point_pwm, NULL, \
ap-1, ix-1)
static struct sensor_device_attribute_2 vt1211_sysfs_fan_pwm[] = {
SENSOR_ATTR_FAN(1),
SENSOR_ATTR_FAN(2),
SENSOR_ATTR_PWM(1),
SENSOR_ATTR_PWM(2),
SENSOR_ATTR_PWM_FREQ(1),
SENSOR_ATTR_PWM_FREQ_RO(2),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 1),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 2),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 3),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP(1, 4),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 1),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 2),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 3),
SENSOR_ATTR_PWM_AUTO_POINT_TEMP_RO(2, 4),
SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(1, 1),
SENSOR_ATTR_PWM_AUTO_POINT_PWM(1, 2),
SENSOR_ATTR_PWM_AUTO_POINT_PWM(1, 3),
SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(1, 4),
SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(2, 1),
SENSOR_ATTR_PWM_AUTO_POINT_PWM(2, 2),
SENSOR_ATTR_PWM_AUTO_POINT_PWM(2, 3),
SENSOR_ATTR_PWM_AUTO_POINT_PWM_RO(2, 4),
};
static struct device_attribute vt1211_sysfs_misc[] = {
__ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm),
__ATTR(cpu0_vid, S_IRUGO, show_vid, NULL),
__ATTR(name, S_IRUGO, show_name, NULL),
__ATTR(alarms, S_IRUGO, show_alarms, NULL),
};
/* ---------------------------------------------------------------------
* Device registration and initialization
* --------------------------------------------------------------------- */
static void vt1211_init_device(struct vt1211_data *data)
{
/* set VRM */
data->vrm = vid_which_vrm();
/* Read (and initialize) UCH config */
data->uch_config = vt1211_read8(data, VT1211_REG_UCH_CONFIG);
if (uch_config > -1) {
data->uch_config = (data->uch_config & 0x83) |
(uch_config << 2);
vt1211_write8(data, VT1211_REG_UCH_CONFIG, data->uch_config);
}
/*
* Initialize the interrupt mode (if request at module load time).
* The VT1211 implements 3 different modes for clearing interrupts:
* 0: Clear INT when status register is read. Regenerate INT as long
* as temp stays above hysteresis limit.
* 1: Clear INT when status register is read. DON'T regenerate INT
* until temp falls below hysteresis limit and exceeds hot limit
* again.
* 2: Clear INT when temp falls below max limit.
*
* The driver only allows to force mode 0 since that's the only one
* that makes sense for 'sensors'
*/
if (int_mode == 0) {
vt1211_write8(data, VT1211_REG_TEMP1_CONFIG, 0);
vt1211_write8(data, VT1211_REG_TEMP2_CONFIG, 0);
}
/* Fill in some hard wired values into our data struct */
data->pwm_auto_pwm[0][3] = 255;
data->pwm_auto_pwm[1][3] = 255;
}
static void vt1211_remove_sysfs(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int i;
for (i = 0; i < ARRAY_SIZE(vt1211_in_attr_group); i++)
sysfs_remove_group(&dev->kobj, &vt1211_in_attr_group[i]);
for (i = 0; i < ARRAY_SIZE(vt1211_temp_attr_group); i++)
sysfs_remove_group(&dev->kobj, &vt1211_temp_attr_group[i]);
for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_fan_pwm); i++) {
device_remove_file(dev,
&vt1211_sysfs_fan_pwm[i].dev_attr);
}
for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_misc); i++)
device_remove_file(dev, &vt1211_sysfs_misc[i]);
}
static int vt1211_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct vt1211_data *data;
struct resource *res;
int i, err;
data = devm_kzalloc(dev, sizeof(struct vt1211_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!devm_request_region(dev, res->start, resource_size(res),
DRVNAME)) {
dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
(unsigned long)res->start, (unsigned long)res->end);
return -EBUSY;
}
data->addr = res->start;
data->name = DRVNAME;
mutex_init(&data->update_lock);
platform_set_drvdata(pdev, data);
/* Initialize the VT1211 chip */
vt1211_init_device(data);
/* Create sysfs interface files */
for (i = 0; i < ARRAY_SIZE(vt1211_in_attr_group); i++) {
if (ISVOLT(i, data->uch_config)) {
err = sysfs_create_group(&dev->kobj,
&vt1211_in_attr_group[i]);
if (err)
goto EXIT_DEV_REMOVE;
}
}
for (i = 0; i < ARRAY_SIZE(vt1211_temp_attr_group); i++) {
if (ISTEMP(i, data->uch_config)) {
err = sysfs_create_group(&dev->kobj,
&vt1211_temp_attr_group[i]);
if (err)
goto EXIT_DEV_REMOVE;
}
}
for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_fan_pwm); i++) {
err = device_create_file(dev,
&vt1211_sysfs_fan_pwm[i].dev_attr);
if (err)
goto EXIT_DEV_REMOVE;
}
for (i = 0; i < ARRAY_SIZE(vt1211_sysfs_misc); i++) {
err = device_create_file(dev,
&vt1211_sysfs_misc[i]);
if (err)
goto EXIT_DEV_REMOVE;
}
/* Register device */
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
dev_err(dev, "Class registration failed (%d)\n", err);
goto EXIT_DEV_REMOVE_SILENT;
}
return 0;
EXIT_DEV_REMOVE:
dev_err(dev, "Sysfs interface creation failed (%d)\n", err);
EXIT_DEV_REMOVE_SILENT:
vt1211_remove_sysfs(pdev);
return err;
}
static void vt1211_remove(struct platform_device *pdev)
{
struct vt1211_data *data = platform_get_drvdata(pdev);
hwmon_device_unregister(data->hwmon_dev);
vt1211_remove_sysfs(pdev);
}
static struct platform_driver vt1211_driver = {
.driver = {
.name = DRVNAME,
},
.probe = vt1211_probe,
.remove_new = vt1211_remove,
};
static int __init vt1211_device_add(unsigned short address)
{
struct resource res = {
.start = address,
.end = address + 0x7f,
.flags = IORESOURCE_IO,
};
int err;
pdev = platform_device_alloc(DRVNAME, address);
if (!pdev) {
err = -ENOMEM;
pr_err("Device allocation failed (%d)\n", err);
goto EXIT;
}
res.name = pdev->name;
err = acpi_check_resource_conflict(&res);
if (err)
goto EXIT_DEV_PUT;
err = platform_device_add_resources(pdev, &res, 1);
if (err) {
pr_err("Device resource addition failed (%d)\n", err);
goto EXIT_DEV_PUT;
}
err = platform_device_add(pdev);
if (err) {
pr_err("Device addition failed (%d)\n", err);
goto EXIT_DEV_PUT;
}
return 0;
EXIT_DEV_PUT:
platform_device_put(pdev);
EXIT:
return err;
}
static int __init vt1211_find(int sio_cip, unsigned short *address)
{
int err;
int devid;
err = superio_enter(sio_cip);
if (err)
return err;
err = -ENODEV;
devid = force_id ? force_id : superio_inb(sio_cip, SIO_VT1211_DEVID);
if (devid != SIO_VT1211_ID)
goto EXIT;
superio_select(sio_cip, SIO_VT1211_LDN_HWMON);
if ((superio_inb(sio_cip, SIO_VT1211_ACTIVE) & 1) == 0) {
pr_warn("HW monitor is disabled, skipping\n");
goto EXIT;
}
*address = ((superio_inb(sio_cip, SIO_VT1211_BADDR) << 8) |
(superio_inb(sio_cip, SIO_VT1211_BADDR + 1))) & 0xff00;
if (*address == 0) {
pr_warn("Base address is not set, skipping\n");
goto EXIT;
}
err = 0;
pr_info("Found VT1211 chip at 0x%04x, revision %u\n",
*address, superio_inb(sio_cip, SIO_VT1211_DEVREV));
EXIT:
superio_exit(sio_cip);
return err;
}
static int __init vt1211_init(void)
{
int err;
unsigned short address = 0;
err = vt1211_find(SIO_REG_CIP1, &address);
if (err) {
err = vt1211_find(SIO_REG_CIP2, &address);
if (err)
goto EXIT;
}
if ((uch_config < -1) || (uch_config > 31)) {
err = -EINVAL;
pr_warn("Invalid UCH configuration %d. Choose a value between 0 and 31.\n",
uch_config);
goto EXIT;
}
if ((int_mode < -1) || (int_mode > 0)) {
err = -EINVAL;
pr_warn("Invalid interrupt mode %d. Only mode 0 is supported.\n",
int_mode);
goto EXIT;
}
err = platform_driver_register(&vt1211_driver);
if (err)
goto EXIT;
/* Sets global pdev as a side effect */
err = vt1211_device_add(address);
if (err)
goto EXIT_DRV_UNREGISTER;
return 0;
EXIT_DRV_UNREGISTER:
platform_driver_unregister(&vt1211_driver);
EXIT:
return err;
}
static void __exit vt1211_exit(void)
{
platform_device_unregister(pdev);
platform_driver_unregister(&vt1211_driver);
}
MODULE_AUTHOR("Juerg Haefliger <juergh@gmail.com>");
MODULE_DESCRIPTION("VT1211 sensors");
MODULE_LICENSE("GPL");
module_init(vt1211_init);
module_exit(vt1211_exit);
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