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hwmon: (pmbus/ibm-cffps) Add version detection capability

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Some systems may plug in either version 1 or version 2 of the IBM common
form factor power supply. Add a version-less compatibility string that
tells the driver to try and detect which version of the power supply is
connected.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/1570648262-25383-3-git-send-email-eajames@linux.ibm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Eddie James 2019-10-09 14:11:02 -05:00 committed by Guenter Roeck
parent c6d294d1aa
commit da806a1777
1 changed files with 33 additions and 4 deletions
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37
drivers/hwmon/pmbus/ibm-cffps.c
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@ -3,6 +3,7 @@
* Copyright 2017 IBM Corp. * Copyright 2017 IBM Corp.
*/ */
#include <linux/bitfield.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/device.h> #include <linux/device.h>
@ -29,6 +30,10 @@
#define CFFPS_INPUT_HISTORY_CMD 0xD6 #define CFFPS_INPUT_HISTORY_CMD 0xD6
#define CFFPS_INPUT_HISTORY_SIZE 100 #define CFFPS_INPUT_HISTORY_SIZE 100
#define CFFPS_CCIN_VERSION GENMASK(15, 8)
#define CFFPS_CCIN_VERSION_1 0x2b
#define CFFPS_CCIN_VERSION_2 0x2e
/* STATUS_MFR_SPECIFIC bits */ /* STATUS_MFR_SPECIFIC bits */
#define CFFPS_MFR_FAN_FAULT BIT(0) #define CFFPS_MFR_FAN_FAULT BIT(0)
#define CFFPS_MFR_THERMAL_FAULT BIT(1) #define CFFPS_MFR_THERMAL_FAULT BIT(1)
@ -58,7 +63,7 @@ enum {
CFFPS_DEBUGFS_NUM_ENTRIES CFFPS_DEBUGFS_NUM_ENTRIES
}; };
enum versions { cffps1, cffps2 }; enum versions { cffps1, cffps2, cffps_unknown };
struct ibm_cffps_input_history { struct ibm_cffps_input_history {
struct mutex update_lock; struct mutex update_lock;
@ -408,7 +413,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
const struct i2c_device_id *id) const struct i2c_device_id *id)
{ {
int i, rc; int i, rc;
enum versions vs; enum versions vs = cffps_unknown;
struct dentry *debugfs; struct dentry *debugfs;
struct dentry *ibm_cffps_dir; struct dentry *ibm_cffps_dir;
struct ibm_cffps *psu; struct ibm_cffps *psu;
@ -418,8 +423,27 @@ static int ibm_cffps_probe(struct i2c_client *client,
vs = (enum versions)md; vs = (enum versions)md;
else if (id) else if (id)
vs = (enum versions)id->driver_data; vs = (enum versions)id->driver_data;
else
vs = cffps1; if (vs == cffps_unknown) {
u16 ccin_version = CFFPS_CCIN_VERSION_1;
int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
if (ccin > 0)
ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
switch (ccin_version) {
default:
case CFFPS_CCIN_VERSION_1:
vs = cffps1;
break;
case CFFPS_CCIN_VERSION_2:
vs = cffps2;
break;
}
/* Set the client name to include the version number. */
snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
}
client->dev.platform_data = &ibm_cffps_pdata; client->dev.platform_data = &ibm_cffps_pdata;
rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]); rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
@ -478,6 +502,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
static const struct i2c_device_id ibm_cffps_id[] = { static const struct i2c_device_id ibm_cffps_id[] = {
{ "ibm_cffps1", cffps1 }, { "ibm_cffps1", cffps1 },
{ "ibm_cffps2", cffps2 }, { "ibm_cffps2", cffps2 },
{ "ibm_cffps", cffps_unknown },
{} {}
}; };
MODULE_DEVICE_TABLE(i2c, ibm_cffps_id); MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
@ -491,6 +516,10 @@ static const struct of_device_id ibm_cffps_of_match[] = {
.compatible = "ibm,cffps2", .compatible = "ibm,cffps2",
.data = (void *)cffps2 .data = (void *)cffps2
}, },
{
.compatible = "ibm,cffps",
.data = (void *)cffps_unknown
},
{} {}
}; };
MODULE_DEVICE_TABLE(of, ibm_cffps_of_match); MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);