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path: root/drivers/hwmon/sch5627.c
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Diffstat (limited to 'drivers/hwmon/sch5627.c')
-rw-r--r--drivers/hwmon/sch5627.c359
1 files changed, 53 insertions, 306 deletions
diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
index 9a51dcca9b0..0cc99fd83e8 100644
--- a/drivers/hwmon/sch5627.c
+++ b/drivers/hwmon/sch5627.c
@@ -1,5 +1,5 @@
/***************************************************************************
- * Copyright (C) 2010-2011 Hans de Goede <hdegoede@redhat.com> *
+ * Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
@@ -28,26 +28,11 @@
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
-#include <linux/io.h>
-#include <linux/acpi.h>
-#include <linux/delay.h>
+#include "sch56xx-common.h"
#define DRVNAME "sch5627"
#define DEVNAME DRVNAME /* We only support one model */
-#define SIO_SCH5627_EM_LD 0x0C /* Embedded Microcontroller LD */
-#define SIO_UNLOCK_KEY 0x55 /* Key to enable Super-I/O */
-#define SIO_LOCK_KEY 0xAA /* Key to disable Super-I/O */
-
-#define SIO_REG_LDSEL 0x07 /* Logical device select */
-#define SIO_REG_DEVID 0x20 /* Device ID */
-#define SIO_REG_ENABLE 0x30 /* Logical device enable */
-#define SIO_REG_ADDR 0x66 /* Logical device address (2 bytes) */
-
-#define SIO_SCH5627_ID 0xC6 /* Chipset ID */
-
-#define REGION_LENGTH 9
-
#define SCH5627_HWMON_ID 0xa5
#define SCH5627_COMPANY_ID 0x5c
#define SCH5627_PRIMARY_ID 0xa0
@@ -94,11 +79,14 @@ static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
struct sch5627_data {
unsigned short addr;
struct device *hwmon_dev;
+ struct sch56xx_watchdog_data *watchdog;
+ u8 control;
u8 temp_max[SCH5627_NO_TEMPS];
u8 temp_crit[SCH5627_NO_TEMPS];
u16 fan_min[SCH5627_NO_FANS];
struct mutex update_lock;
+ unsigned long last_battery; /* In jiffies */
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u16 temp[SCH5627_NO_TEMPS];
@@ -106,164 +94,6 @@ struct sch5627_data {
u16 in[SCH5627_NO_IN];
};
-static struct platform_device *sch5627_pdev;
-
-/* Super I/O functions */
-static inline int superio_inb(int base, int reg)
-{
- outb(reg, base);
- return inb(base + 1);
-}
-
-static inline int superio_enter(int base)
-{
- /* Don't step on other drivers' I/O space by accident */
- if (!request_muxed_region(base, 2, DRVNAME)) {
- pr_err("I/O address 0x%04x already in use\n", base);
- return -EBUSY;
- }
-
- outb(SIO_UNLOCK_KEY, base);
-
- return 0;
-}
-
-static inline void superio_select(int base, int ld)
-{
- outb(SIO_REG_LDSEL, base);
- outb(ld, base + 1);
-}
-
-static inline void superio_exit(int base)
-{
- outb(SIO_LOCK_KEY, base);
- release_region(base, 2);
-}
-
-static int sch5627_read_virtual_reg(struct sch5627_data *data, u16 reg)
-{
- u8 val;
- int i;
- /*
- * According to SMSC for the commands we use the maximum time for
- * the EM to respond is 15 ms, but testing shows in practice it
- * responds within 15-32 reads, so we first busy poll, and if
- * that fails sleep a bit and try again until we are way past
- * the 15 ms maximum response time.
- */
- const int max_busy_polls = 64;
- const int max_lazy_polls = 32;
-
- /* (Optional) Write-Clear the EC to Host Mailbox Register */
- val = inb(data->addr + 1);
- outb(val, data->addr + 1);
-
- /* Set Mailbox Address Pointer to first location in Region 1 */
- outb(0x00, data->addr + 2);
- outb(0x80, data->addr + 3);
-
- /* Write Request Packet Header */
- outb(0x02, data->addr + 4); /* Access Type: VREG read */
- outb(0x01, data->addr + 5); /* # of Entries: 1 Byte (8-bit) */
- outb(0x04, data->addr + 2); /* Mailbox AP to first data entry loc. */
-
- /* Write Address field */
- outb(reg & 0xff, data->addr + 6);
- outb(reg >> 8, data->addr + 7);
-
- /* Execute the Random Access Command */
- outb(0x01, data->addr); /* Write 01h to the Host-to-EC register */
-
- /* EM Interface Polling "Algorithm" */
- for (i = 0; i < max_busy_polls + max_lazy_polls; i++) {
- if (i >= max_busy_polls)
- msleep(1);
- /* Read Interrupt source Register */
- val = inb(data->addr + 8);
- /* Write Clear the interrupt source bits */
- if (val)
- outb(val, data->addr + 8);
- /* Command Completed ? */
- if (val & 0x01)
- break;
- }
- if (i == max_busy_polls + max_lazy_polls) {
- pr_err("Max retries exceeded reading virtual "
- "register 0x%04hx (%d)\n", reg, 1);
- return -EIO;
- }
-
- /*
- * According to SMSC we may need to retry this, but sofar I've always
- * seen this succeed in 1 try.
- */
- for (i = 0; i < max_busy_polls; i++) {
- /* Read EC-to-Host Register */
- val = inb(data->addr + 1);
- /* Command Completed ? */
- if (val == 0x01)
- break;
-
- if (i == 0)
- pr_warn("EC reports: 0x%02x reading virtual register "
- "0x%04hx\n", (unsigned int)val, reg);
- }
- if (i == max_busy_polls) {
- pr_err("Max retries exceeded reading virtual "
- "register 0x%04hx (%d)\n", reg, 2);
- return -EIO;
- }
-
- /*
- * According to the SMSC app note we should now do:
- *
- * Set Mailbox Address Pointer to first location in Region 1 *
- * outb(0x00, data->addr + 2);
- * outb(0x80, data->addr + 3);
- *
- * But if we do that things don't work, so let's not.
- */
-
- /* Read Data from Mailbox */
- return inb(data->addr + 4);
-}
-
-static int sch5627_read_virtual_reg16(struct sch5627_data *data, u16 reg)
-{
- int lsb, msb;
-
- /* Read LSB first, this will cause the matching MSB to be latched */
- lsb = sch5627_read_virtual_reg(data, reg);
- if (lsb < 0)
- return lsb;
-
- msb = sch5627_read_virtual_reg(data, reg + 1);
- if (msb < 0)
- return msb;
-
- return lsb | (msb << 8);
-}
-
-static int sch5627_read_virtual_reg12(struct sch5627_data *data, u16 msb_reg,
- u16 lsn_reg, int high_nibble)
-{
- int msb, lsn;
-
- /* Read MSB first, this will cause the matching LSN to be latched */
- msb = sch5627_read_virtual_reg(data, msb_reg);
- if (msb < 0)
- return msb;
-
- lsn = sch5627_read_virtual_reg(data, lsn_reg);
- if (lsn < 0)
- return lsn;
-
- if (high_nibble)
- return (msb << 4) | (lsn >> 4);
- else
- return (msb << 4) | (lsn & 0x0f);
-}
-
static struct sch5627_data *sch5627_update_device(struct device *dev)
{
struct sch5627_data *data = dev_get_drvdata(dev);
@@ -272,10 +102,17 @@ static struct sch5627_data *sch5627_update_device(struct device *dev)
mutex_lock(&data->update_lock);
+ /* Trigger a Vbat voltage measurement every 5 minutes */
+ if (time_after(jiffies, data->last_battery + 300 * HZ)) {
+ sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
+ data->control | 0x10);
+ data->last_battery = jiffies;
+ }
+
/* Cache the values for 1 second */
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
for (i = 0; i < SCH5627_NO_TEMPS; i++) {
- val = sch5627_read_virtual_reg12(data,
+ val = sch56xx_read_virtual_reg12(data->addr,
SCH5627_REG_TEMP_MSB[i],
SCH5627_REG_TEMP_LSN[i],
SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
@@ -287,7 +124,7 @@ static struct sch5627_data *sch5627_update_device(struct device *dev)
}
for (i = 0; i < SCH5627_NO_FANS; i++) {
- val = sch5627_read_virtual_reg16(data,
+ val = sch56xx_read_virtual_reg16(data->addr,
SCH5627_REG_FAN[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
@@ -297,7 +134,7 @@ static struct sch5627_data *sch5627_update_device(struct device *dev)
}
for (i = 0; i < SCH5627_NO_IN; i++) {
- val = sch5627_read_virtual_reg12(data,
+ val = sch56xx_read_virtual_reg12(data->addr,
SCH5627_REG_IN_MSB[i],
SCH5627_REG_IN_LSN[i],
SCH5627_REG_IN_HIGH_NIBBLE[i]);
@@ -316,7 +153,7 @@ abort:
return ret;
}
-static int __devinit sch5627_read_limits(struct sch5627_data *data)
+static int sch5627_read_limits(struct sch5627_data *data)
{
int i, val;
@@ -325,18 +162,21 @@ static int __devinit sch5627_read_limits(struct sch5627_data *data)
* Note what SMSC calls ABS, is what lm_sensors calls max
* (aka high), and HIGH is what lm_sensors calls crit.
*/
- val = sch5627_read_virtual_reg(data, SCH5627_REG_TEMP_ABS[i]);
+ val = sch56xx_read_virtual_reg(data->addr,
+ SCH5627_REG_TEMP_ABS[i]);
if (val < 0)
return val;
data->temp_max[i] = val;
- val = sch5627_read_virtual_reg(data, SCH5627_REG_TEMP_HIGH[i]);
+ val = sch56xx_read_virtual_reg(data->addr,
+ SCH5627_REG_TEMP_HIGH[i]);
if (val < 0)
return val;
data->temp_crit[i] = val;
}
for (i = 0; i < SCH5627_NO_FANS; i++) {
- val = sch5627_read_virtual_reg16(data, SCH5627_REG_FAN_MIN[i]);
+ val = sch56xx_read_virtual_reg16(data->addr,
+ SCH5627_REG_FAN_MIN[i]);
if (val < 0)
return val;
data->fan_min[i] = val;
@@ -614,22 +454,24 @@ static int sch5627_remove(struct platform_device *pdev)
{
struct sch5627_data *data = platform_get_drvdata(pdev);
+ if (data->watchdog)
+ sch56xx_watchdog_unregister(data->watchdog);
+
if (data->hwmon_dev)
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
- platform_set_drvdata(pdev, NULL);
- kfree(data);
return 0;
}
-static int __devinit sch5627_probe(struct platform_device *pdev)
+static int sch5627_probe(struct platform_device *pdev)
{
struct sch5627_data *data;
int err, build_code, build_id, hwmon_rev, val;
- data = kzalloc(sizeof(struct sch5627_data), GFP_KERNEL);
+ data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_data),
+ GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -637,7 +479,7 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
mutex_init(&data->update_lock);
platform_set_drvdata(pdev, data);
- val = sch5627_read_virtual_reg(data, SCH5627_REG_HWMON_ID);
+ val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
if (val < 0) {
err = val;
goto error;
@@ -649,7 +491,7 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
goto error;
}
- val = sch5627_read_virtual_reg(data, SCH5627_REG_COMPANY_ID);
+ val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
if (val < 0) {
err = val;
goto error;
@@ -661,7 +503,7 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
goto error;
}
- val = sch5627_read_virtual_reg(data, SCH5627_REG_PRIMARY_ID);
+ val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
if (val < 0) {
err = val;
goto error;
@@ -673,34 +515,43 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
goto error;
}
- build_code = sch5627_read_virtual_reg(data, SCH5627_REG_BUILD_CODE);
+ build_code = sch56xx_read_virtual_reg(data->addr,
+ SCH5627_REG_BUILD_CODE);
if (build_code < 0) {
err = build_code;
goto error;
}
- build_id = sch5627_read_virtual_reg16(data, SCH5627_REG_BUILD_ID);
+ build_id = sch56xx_read_virtual_reg16(data->addr,
+ SCH5627_REG_BUILD_ID);
if (build_id < 0) {
err = build_id;
goto error;
}
- hwmon_rev = sch5627_read_virtual_reg(data, SCH5627_REG_HWMON_REV);
+ hwmon_rev = sch56xx_read_virtual_reg(data->addr,
+ SCH5627_REG_HWMON_REV);
if (hwmon_rev < 0) {
err = hwmon_rev;
goto error;
}
- val = sch5627_read_virtual_reg(data, SCH5627_REG_CTRL);
+ val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
if (val < 0) {
err = val;
goto error;
}
- if (!(val & 0x01)) {
+ data->control = val;
+ if (!(data->control & 0x01)) {
pr_err("hardware monitoring not enabled\n");
err = -ENODEV;
goto error;
}
+ /* Trigger a Vbat voltage measurement, so that we get a valid reading
+ the first time we read Vbat */
+ sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
+ data->control | 0x10);
+ data->last_battery = jiffies;
/*
* Read limits, we do this only once as reading a register on
@@ -710,6 +561,7 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
if (err)
goto error;
+ pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
build_code, build_id, hwmon_rev);
@@ -725,6 +577,11 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
goto error;
}
+ /* Note failing to register the watchdog is not a fatal error */
+ data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
+ (build_code << 24) | (build_id << 8) | hwmon_rev,
+ &data->update_lock, 1);
+
return 0;
error:
@@ -732,85 +589,6 @@ error:
return err;
}
-static int __init sch5627_find(int sioaddr, unsigned short *address)
-{
- u8 devid;
- int err = superio_enter(sioaddr);
- if (err)
- return err;
-
- devid = superio_inb(sioaddr, SIO_REG_DEVID);
- if (devid != SIO_SCH5627_ID) {
- pr_debug("Unsupported device id: 0x%02x\n",
- (unsigned int)devid);
- err = -ENODEV;
- goto exit;
- }
-
- superio_select(sioaddr, SIO_SCH5627_EM_LD);
-
- if (!(superio_inb(sioaddr, SIO_REG_ENABLE) & 0x01)) {
- pr_warn("Device not activated\n");
- err = -ENODEV;
- goto exit;
- }
-
- /*
- * Warning the order of the low / high byte is the other way around
- * as on most other superio devices!!
- */
- *address = superio_inb(sioaddr, SIO_REG_ADDR) |
- superio_inb(sioaddr, SIO_REG_ADDR + 1) << 8;
- if (*address == 0) {
- pr_warn("Base address not set\n");
- err = -ENODEV;
- goto exit;
- }
-
- pr_info("Found %s chip at %#hx\n", DEVNAME, *address);
-exit:
- superio_exit(sioaddr);
- return err;
-}
-
-static int __init sch5627_device_add(unsigned short address)
-{
- struct resource res = {
- .start = address,
- .end = address + REGION_LENGTH - 1,
- .flags = IORESOURCE_IO,
- };
- int err;
-
- sch5627_pdev = platform_device_alloc(DRVNAME, address);
- if (!sch5627_pdev)
- return -ENOMEM;
-
- res.name = sch5627_pdev->name;
- err = acpi_check_resource_conflict(&res);
- if (err)
- goto exit_device_put;
-
- err = platform_device_add_resources(sch5627_pdev, &res, 1);
- if (err) {
- pr_err("Device resource addition failed\n");
- goto exit_device_put;
- }
-
- err = platform_device_add(sch5627_pdev);
- if (err) {
- pr_err("Device addition failed\n");
- goto exit_device_put;
- }
-
- return 0;
-
-exit_device_put:
- platform_device_put(sch5627_pdev);
-
- return err;
-}
-
static struct platform_driver sch5627_driver = {
.driver = {
.owner = THIS_MODULE,
@@ -820,39 +598,8 @@ static struct platform_driver sch5627_driver = {
.remove = sch5627_remove,
};
-static int __init sch5627_init(void)
-{
- int err = -ENODEV;
- unsigned short address;
-
- if (sch5627_find(0x4e, &address) && sch5627_find(0x2e, &address))
- goto exit;
-
- err = platform_driver_register(&sch5627_driver);
- if (err)
- goto exit;
-
- err = sch5627_device_add(address);
- if (err)
- goto exit_driver;
-
- return 0;
-
-exit_driver:
- platform_driver_unregister(&sch5627_driver);
-exit:
- return err;
-}
-
-static void __exit sch5627_exit(void)
-{
- platform_device_unregister(sch5627_pdev);
- platform_driver_unregister(&sch5627_driver);
-}
+module_platform_driver(sch5627_driver);
MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
-MODULE_AUTHOR("Hans de Goede (hdegoede@redhat.com)");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");
-
-module_init(sch5627_init);
-module_exit(sch5627_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-13 22:42:03 +0000