[PATCH linux dev-4.13 2/2] hwmon: (ucd9000) Add debugfs to list mfr_status info
Eddie James
eajames at linux.vnet.ibm.com
Wed Feb 28 03:28:41 AEDT 2018
From: Christopher Bostic <cbostic at linux.vnet.ibm.com>
Expose via files in debugfs the gpiN_fault fields as well as
the entire contents of the mfr_status register. Allows user
space to pull this data for error logging etc...
Signed-off-by: Christopher Bostic <cbostic at linux.vnet.ibm.com>
Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
drivers/hwmon/pmbus/ucd9000.c | 163 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 162 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index 288a487..cb5080c 100644
--- a/drivers/hwmon/pmbus/ucd9000.c
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -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>
@@ -28,6 +29,7 @@
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include <linux/gpio.h>
+#include <linux/idr.h>
#include "pmbus.h"
enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
@@ -36,6 +38,7 @@
#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
@@ -57,17 +60,29 @@
#define UCD9000_MON_VOLTAGE_HW 4
#define UCD9000_NUM_FAN 4
+#define UCD9000_NAME_SIZE 24
#define UCD9000_GPIO_NAME_LEN 16
#define UCD90160_NUM_GPIOS 26
+#define UCD90160_GPI_COUNT 8
+#define UCD90160_GPI_FAULT_BASE 16
+
+static DEFINE_IDA(ucd9000_ida);
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
struct gpio_chip gpio;
+ struct dentry *debugfs;
+ int idx;
};
#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;
@@ -324,6 +339,138 @@ static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT, val);
}
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static int ucd9000_get_mfr_status(struct i2c_client *client, u32 *buffer)
+{
+ int ret;
+
+ ret = pmbus_set_page(client, 0);
+ if (ret < 0) {
+ dev_err(&client->dev, "pmbus_set_page failed. rc:%d\n", ret);
+
+ return ret;
+ }
+
+ /*
+ * Warning:
+ *
+ * Though not currently supported this will cause stack corruption for
+ * ucd90240! Command reference, page 81:
+ *
+ * With the ucd90120 and ucd90124 devices, this command [MFR_STATUS]
+ * is 2 bytes long (bits 0-15). With the ucd90240 this command is 5
+ * bytes long. With all other devices, it is 4 bytes long.
+ */
+ return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS,
+ (u8 *)buffer);
+}
+
+static int ucd9000_debugfs_get_mfr_status_bit(void *data, u64 *val)
+{
+ struct ucd9000_debugfs_entry *entry = data;
+ struct i2c_client *client = entry->client;
+ int nr = entry->index;
+ u32 buffer;
+ int ret;
+
+ ret = ucd9000_get_mfr_status(client, &buffer);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read mfr status. rc:%d\n",
+ ret);
+
+ return ret;
+ }
+
+ *val = !!(ret & BIT(nr));
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_ops_mfr_status_bit,
+ ucd9000_debugfs_get_mfr_status_bit, NULL, "%1lld\n");
+
+static int ucd9000_debugfs_get_mfr_status_word(void *data, u64 *val)
+{
+ struct ucd9000_debugfs_entry *entry = data;
+ struct i2c_client *client = entry->client;
+ u32 buffer;
+ int ret;
+
+ ret = ucd9000_get_mfr_status(client, &buffer);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read mfr status. rc:%d\n",
+ ret);
+
+ return ret;
+ }
+
+ *val = ret;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_ops_mfr_status_word,
+ ucd9000_debugfs_get_mfr_status_word, NULL, "%08llx\n");
+
+static int ucd9000_init_debugfs(struct i2c_client *client,
+ struct ucd9000_data *data)
+{
+ struct ucd9000_debugfs_entry *entries;
+ char name[UCD9000_NAME_SIZE];
+ int i;
+
+ data->idx = ida_simple_get(&ucd9000_ida, 0, INT_MAX, GFP_KERNEL);
+ scnprintf(name, UCD9000_NAME_SIZE, "ucd9000.%d", data->idx);
+ data->debugfs = debugfs_create_dir(name, NULL);
+ if (IS_ERR(data->debugfs)) {
+ dev_warn(&client->dev, "Failed to create debugfs dir: %p\n",
+ data->debugfs);
+ data->debugfs = NULL;
+ ida_simple_remove(&ucd9000_ida, data->idx);
+ return 0;
+ }
+
+ /*
+ * Warning:
+ *
+ * Makes assumption we're on a ucd90160 type! entries will be different
+ * sizes for other types.
+ */
+ entries = devm_kzalloc(&client->dev, sizeof(*entries) *
+ (UCD90160_GPI_COUNT + 1) * 10, GFP_KERNEL);
+ if (!entries) {
+ ida_simple_remove(&ucd9000_ida, data->idx);
+ return -ENOMEM;
+ }
+
+ /*
+ * Warning:
+ *
+ * This makes the assumption we're probing a ucd90160 type and how the
+ * GPI information is organized. Needs to account for all other
+ * ucd9000 varieties.
+ */
+ for (i = 0; i < UCD90160_GPI_COUNT; i++) {
+ entries[i].client = client;
+ entries[i].index = UCD90160_GPI_FAULT_BASE + i;
+ scnprintf(name, UCD9000_NAME_SIZE, "gpi%d_alarm", i+1);
+ debugfs_create_file(name, 0444, data->debugfs, &entries[i],
+ &ucd9000_debugfs_ops_mfr_status_bit);
+ }
+ entries[i].client = client;
+ scnprintf(name, UCD9000_NAME_SIZE, "mfr_status");
+ debugfs_create_file(name, 0444, data->debugfs, &entries[i],
+ &ucd9000_debugfs_ops_mfr_status_word);
+
+ return 0;
+}
+#else
+static int ucd9000_init_debugfs(struct i2c_client *client,
+ struct ucd9000_data *data)
+{
+ return 0;
+}
+#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
+
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -469,9 +616,23 @@ static int ucd9000_probe(struct i2c_client *client,
return ret;
}
+ ret = ucd9000_init_debugfs(client, data);
+ if (ret < 0)
+ dev_warn(&client->dev, "Failed to register debugfs: %d\n", ret);
+
return pmbus_do_probe(client, mid, info);
}
+static int ucd9000_remove(struct i2c_client *client)
+{
+ struct ucd9000_data *data
+ = to_ucd9000_data(pmbus_get_driver_info(client));
+
+ ida_simple_remove(&ucd9000_ida, data->idx);
+ debugfs_remove_recursive(data->debugfs);
+ return pmbus_do_remove(client);
+}
+
/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
.driver = {
@@ -479,7 +640,7 @@ static int ucd9000_probe(struct i2c_client *client,
.of_match_table = of_match_ptr(ucd9000_of_match),
},
.probe = ucd9000_probe,
- .remove = pmbus_do_remove,
+ .remove = ucd9000_remove,
.id_table = ucd9000_id,
};
--
1.8.3.1
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