[PATCH linux dev-4.10 v6 3/3] hwmon: (ucd9000) Add debugfs to list mfr_status info
Matt Spinler
mspinler at linux.vnet.ibm.com
Fri Sep 1 02:12:02 AEST 2017
Tested-by: Matt Spinler mspinler at linux.vnet.ibm.com
On 8/30/2017 4:49 PM, Christopher Bostic wrote:
> 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>
> ---
> v6 - Remove chip idx values on remove so that we can retain the
> same indexes regardless how many times we're bound/unbound.
> - Remove type 90160 check when adding debugfs.
> v5 - Add unique debugfs dir ID for each ucd9000 sysfs device.
> - Change branching return to a !! method.
> - Clean up line breaks, other white space.
> - Add comments on assumptions made regarding ucd90160 versus other
> types.
> v2 - Remove mfr_status directory in debugfs and place the files
> up in the parent ucd9000 directory.
> ---
> drivers/hwmon/pmbus/ucd9000.c | 160 +++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 159 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
> index 61abd3a..d5c310f 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/init.h>
> @@ -29,6 +30,7 @@
> #include <linux/sysfs.h>
> #include <linux/hwmon-sysfs.h>
> #include <linux/gpio.h>
> +#include <linux/idr.h>
> #include "pmbus.h"
>
> enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
> @@ -38,6 +40,7 @@
> #define UCD9000_FAN_CONFIG_INDEX 0xe7
> #define UCD9000_FAN_CONFIG 0xe8
> #define UCD9000_LOGGED_FAULTS 0xea
> +#define UCD9000_MFR_STATUS 0xf3
> #define UCD9000_GPIO_SELECT 0xfa
> #define UCD9000_GPIO_CONFIG 0xfb
> #define UCD9000_DEVICE_ID 0xfd
> @@ -59,17 +62,29 @@
> #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;
> @@ -297,6 +312,140 @@ static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
> return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT, val);
> }
>
> +static struct dentry *ucd9000_debugfs_dir;
> +
> +#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);
> + ucd9000_debugfs_dir = debugfs_create_dir(name, NULL);
> + if (IS_ERR(ucd9000_debugfs_dir)) {
> + dev_warn(&client->dev, "Failed to create debugfs dir: %p\n",
> + ucd9000_debugfs_dir);
> + ucd9000_debugfs_dir = 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, ucd9000_debugfs_dir,
> + &entries[i],
> + &ucd9000_debugfs_ops_mfr_status_bit);
> + }
> + entries[i].client = client;
> + scnprintf(name, UCD9000_NAME_SIZE, "mfr_status");
> + debugfs_create_file(name, 0444, ucd9000_debugfs_dir, &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 ssize_t ucd9000_clear_logged_faults(struct device *dev,
> struct device_attribute *attr, const char *buf,
> size_t count)
> @@ -474,12 +623,21 @@ static int ucd9000_probe(struct i2c_client *client,
> return ret;
> }
>
> - return pmbus_do_probe(client, mid, info);
> + 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));
> +
> sysfs_remove_group(&client->dev.kobj, &ucd9000_attr_group);
> + ida_simple_remove(&ucd9000_ida, data->idx);
> + debugfs_remove_recursive(ucd9000_debugfs_dir);
> return pmbus_do_remove(client);
> }
>
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