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hwmon: (ucd9000) Add debugfs attributes to provide mfr_status

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Expose the gpiN_fault fields of mfr_status as individual debugfs
attributes. This provides a way for users to be easily notified of gpi
faults. Also provide the whole mfr_status register in debugfs.

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Christopher Bostic 2018-03-16 16:22:06 -05:00 committed by Guenter Roeck
parent ca781fb7fd
commit 72816cb06e
1 changed files with 137 additions and 1 deletions
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138
drivers/hwmon/pmbus/ucd9000.c
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@ -19,6 +19,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
@ -37,6 +38,7 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
#define UCD9000_MFR_STATUS 0xf3
#define UCD9000_GPIO_SELECT 0xfa
#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
@ -64,15 +66,24 @@ enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
#define UCD901XX_NUM_GPIOS 26
#define UCD90910_NUM_GPIOS 26
#define UCD9000_DEBUGFS_NAME_LEN 24
#define UCD9000_GPI_COUNT 8
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gpio;
#endif
struct dentry *debugfs;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
struct ucd9000_debugfs_entry {
struct i2c_client *client;
u8 index;
};
static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
int fan_config = 0;
@ -359,6 +370,122 @@ static void ucd9000_probe_gpio(struct i2c_client *client,
}
#endif /* CONFIG_GPIOLIB */
#ifdef CONFIG_DEBUG_FS
static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
{
int ret = pmbus_set_page(client, 0);
if (ret < 0)
return ret;
return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
}
static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
{
struct ucd9000_debugfs_entry *entry = data;
struct i2c_client *client = entry->client;
u8 buffer[I2C_SMBUS_BLOCK_MAX];
int ret;
ret = ucd9000_get_mfr_status(client, buffer);
if (ret < 0)
return ret;
/*
* Attribute only created for devices with gpi fault bits at bits
* 16-23, which is the second byte of the response.
*/
*val = !!(buffer[1] & BIT(entry->index));
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
char __user *buf, size_t count,
loff_t *ppos)
{
struct i2c_client *client = file->private_data;
u8 buffer[I2C_SMBUS_BLOCK_MAX];
char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
char *res;
int rc;
rc = ucd9000_get_mfr_status(client, buffer);
if (rc < 0)
return rc;
res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
*res++ = '\n';
*res = 0;
return simple_read_from_buffer(buf, count, ppos, str, res - str);
}
static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
.llseek = noop_llseek,
.read = ucd9000_debugfs_read_mfr_status,
.open = simple_open,
};
static int ucd9000_init_debugfs(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
struct dentry *debugfs;
struct ucd9000_debugfs_entry *entries;
int i;
char name[UCD9000_DEBUGFS_NAME_LEN];
debugfs = pmbus_get_debugfs_dir(client);
if (!debugfs)
return -ENOENT;
data->debugfs = debugfs_create_dir(client->name, debugfs);
if (!data->debugfs)
return -ENOENT;
/*
* Of the chips this driver supports, only the UCD9090, UCD90160,
* and UCD90910 report GPI faults in their MFR_STATUS register, so only
* create the GPI fault debugfs attributes for those chips.
*/
if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
mid->driver_data == ucd90910) {
entries = devm_kzalloc(&client->dev,
sizeof(*entries) * UCD9000_GPI_COUNT,
GFP_KERNEL);
if (!entries)
return -ENOMEM;
for (i = 0; i < UCD9000_GPI_COUNT; i++) {
entries[i].client = client;
entries[i].index = i;
scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
"gpi%d_alarm", i + 1);
debugfs_create_file(name, 0444, data->debugfs,
&entries[i],
&ucd9000_debugfs_mfr_status_bit);
}
}
scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
debugfs_create_file(name, 0444, data->debugfs, client,
&ucd9000_debugfs_show_mfr_status_fops);
return 0;
}
#else
static int ucd9000_init_debugfs(struct i2c_client *client,
const struct i2c_device_id *mid,
struct ucd9000_data *data)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -475,7 +602,16 @@ static int ucd9000_probe(struct i2c_client *client,
ucd9000_probe_gpio(client, mid, data);
return pmbus_do_probe(client, mid, info);
ret = pmbus_do_probe(client, mid, info);
if (ret)
return ret;
ret = ucd9000_init_debugfs(client, mid, data);
if (ret)
dev_warn(&client->dev, "Failed to register debugfs: %d\n",
ret);
return 0;
}
/* This is the driver that will be inserted */