The ucd9000 series chips have gpio pins. Add a gpio chip interface to the ucd
device so that users can query and set the state of the gpio pins.
Add a debugfs interface using the existing pmbus debugfs directory to provide
MFR_STATUS and the status of the gpi faults to users.
Changes since v2:
- split the gpio registration into it's own function
Changes since v1:
- dropped dev_err messages
- made gpio chip registration conditional on having gpio pins
- made mfr_status debugfs attribute more simple
Christopher Bostic (2):
hwmon: (ucd9000) Add gpio chip interface
hwmon: (ucd9000) Add debugfs attributes to provide mfr_status
drivers/hwmon/pmbus/ucd9000.c | 340 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 339 insertions(+), 1 deletion(-)
--
1.8.3.1
From: Christopher Bostic <[email protected]>
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 <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Signed-off-by: Eddie James <[email protected]>
---
drivers/hwmon/pmbus/ucd9000.c | 140 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 139 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index 321b837..4158c23 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>
@@ -36,6 +37,7 @@
#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
@@ -63,13 +65,22 @@
#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;
struct gpio_chip gpio;
+ 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;
@@ -306,6 +317,124 @@ static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
val);
}
+#if IS_ENABLED(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;
+
+ /*
+ * 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, 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[4];
+ int ret;
+
+ /*
+ * This attribute is only created for devices that return 4 bytes for
+ * status_mfr, so it's safe to call with 4-byte buffer.
+ */
+ 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[5] = { 0 }; /* Need max 5 bytes for any ucd9000 chip. */
+ int ret;
+
+ ret = ucd9000_get_mfr_status(client, buffer);
+ if (ret < 0)
+ return ret;
+
+ return simple_read_from_buffer(buf, count, ppos, buffer, ret);
+}
+
+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,
+ struct ucd9000_data *data)
+{
+ return 0;
+}
+#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
+
static int ucd9000_probe_gpio(struct i2c_client *client,
struct ucd9000_data *data,
const struct i2c_device_id *mid)
@@ -463,7 +592,16 @@ static int ucd9000_probe(struct i2c_client *client,
if (ret)
dev_warn(&client->dev, "Could not add gpiochip: %d\n", ret);
- 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 */
--
1.8.3.1
From: Christopher Bostic <[email protected]>
Add a struct gpio_chip and define some methods so that this device's
I/O can be accessed via /sys/class/gpio.
Signed-off-by: Christopher Bostic <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Signed-off-by: Eddie James <[email protected]>
---
drivers/hwmon/pmbus/ucd9000.c | 200 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 200 insertions(+)
diff --git a/drivers/hwmon/pmbus/ucd9000.c b/drivers/hwmon/pmbus/ucd9000.c
index b74dbec..321b837 100644
--- a/drivers/hwmon/pmbus/ucd9000.c
+++ b/drivers/hwmon/pmbus/ucd9000.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
+#include <linux/gpio.h>
#include "pmbus.h"
enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
@@ -35,8 +36,18 @@
#define UCD9000_NUM_PAGES 0xd6
#define UCD9000_FAN_CONFIG_INDEX 0xe7
#define UCD9000_FAN_CONFIG 0xe8
+#define UCD9000_GPIO_SELECT 0xfa
+#define UCD9000_GPIO_CONFIG 0xfb
#define UCD9000_DEVICE_ID 0xfd
+/* GPIO CONFIG bits */
+#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
+#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
+#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
+#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
+#define UCD9000_GPIO_INPUT 0
+#define UCD9000_GPIO_OUTPUT 1
+
#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
@@ -47,9 +58,15 @@
#define UCD9000_NUM_FAN 4
+#define UCD9000_GPIO_NAME_LEN 16
+#define UCD9090_NUM_GPIOS 23
+#define UCD901XX_NUM_GPIOS 26
+#define UCD90910_NUM_GPIOS 26
+
struct ucd9000_data {
u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
struct pmbus_driver_info info;
+ struct gpio_chip gpio;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
@@ -149,6 +166,185 @@ static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);
+static int ucd9000_gpio_read_config(struct i2c_client *client,
+ unsigned int offset)
+{
+ int ret;
+
+ /* No page set required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
+ if (ret < 0)
+ return ret;
+
+ return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
+}
+
+static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
+}
+
+static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0) {
+ dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
+ offset, ret);
+ return;
+ }
+
+ if (value) {
+ if (ret & UCD9000_GPIO_CONFIG_STATUS)
+ return;
+
+ ret |= UCD9000_GPIO_CONFIG_STATUS;
+ } else {
+ if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
+ return;
+
+ ret &= ~UCD9000_GPIO_CONFIG_STATUS;
+ }
+
+ ret |= UCD9000_GPIO_CONFIG_ENABLE;
+
+ /* Page set not required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
+ if (ret < 0) {
+ dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
+ offset, ret);
+ return;
+ }
+
+ ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
+
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
+ if (ret < 0)
+ dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
+ offset, ret);
+}
+
+static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
+}
+
+static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
+ unsigned int offset, bool direction_out,
+ int requested_out)
+{
+ struct i2c_client *client = gpiochip_get_data(gc);
+ int ret, config, out_val;
+
+ ret = ucd9000_gpio_read_config(client, offset);
+ if (ret < 0)
+ return ret;
+
+ if (direction_out) {
+ out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
+
+ if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
+ if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
+ return 0;
+ } else {
+ ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
+ }
+
+ if (out_val)
+ ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
+ else
+ ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
+
+ } else {
+ if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
+ return 0;
+
+ ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
+ }
+
+ ret |= UCD9000_GPIO_CONFIG_ENABLE;
+ config = ret;
+
+ /* Page set not required */
+ ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
+ if (ret < 0)
+ return ret;
+
+ config &= ~UCD9000_GPIO_CONFIG_ENABLE;
+
+ return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
+}
+
+static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
+}
+
+static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int val)
+{
+ return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
+ val);
+}
+
+static int ucd9000_probe_gpio(struct i2c_client *client,
+ struct ucd9000_data *data,
+ const struct i2c_device_id *mid)
+{
+ switch (mid->driver_data) {
+ case ucd9090:
+ data->gpio.ngpio = UCD9090_NUM_GPIOS;
+ break;
+ case ucd90120:
+ case ucd90124:
+ case ucd90160:
+ data->gpio.ngpio = UCD901XX_NUM_GPIOS;
+ break;
+ case ucd90910:
+ data->gpio.ngpio = UCD90910_NUM_GPIOS;
+ break;
+ default:
+ return 0; /* GPIO support is optional. */
+ }
+
+ /*
+ * Pinmux support has not been added to the new gpio_chip.
+ * This support should be added when possible given the mux
+ * behavior of these IO devices.
+ */
+ data->gpio.label = client->name;
+ data->gpio.get_direction = ucd9000_gpio_get_direction;
+ data->gpio.direction_input = ucd9000_gpio_direction_input;
+ data->gpio.direction_output = ucd9000_gpio_direction_output;
+ data->gpio.get = ucd9000_gpio_get;
+ data->gpio.set = ucd9000_gpio_set;
+ data->gpio.can_sleep = true;
+ data->gpio.base = -1;
+ data->gpio.parent = &client->dev;
+ data->gpio.owner = THIS_MODULE;
+
+ return devm_gpiochip_add_data(&client->dev, &data->gpio, client);
+}
+
static int ucd9000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -263,6 +459,10 @@ static int ucd9000_probe(struct i2c_client *client,
| PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
}
+ ret = ucd9000_probe_gpio(client, data, mid);
+ if (ret)
+ dev_warn(&client->dev, "Could not add gpiochip: %d\n", ret);
+
return pmbus_do_probe(client, mid, info);
}
--
1.8.3.1