@@ -8,12 +8,26 @@
*/
#include <linux/bitops.h>
+#include <linux/debugfs.h>
#include <linux/device.h>
+#include <linux/fs.h>
#include <linux/i2c.h>
+#include <linux/jiffies.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include "pmbus.h"
+#define CFFPS_FRU_CMD 0x9A
+#define CFFPS_PN_CMD 0x9B
+#define CFFPS_SN_CMD 0x9E
+#define CFFPS_CCIN_CMD 0xBD
+#define CFFPS_FW_CMD_START 0xFA
+#define CFFPS_FW_NUM_BYTES 4
+
+#define CFFPS_INPUT_HISTORY_CMD 0xD6
+#define CFFPS_INPUT_HISTORY_SIZE 100
+
/* STATUS_MFR_SPECIFIC bits */
#define CFFPS_MFR_FAN_FAULT BIT(0)
#define CFFPS_MFR_THERMAL_FAULT BIT(1)
@@ -24,6 +38,144 @@
#define CFFPS_MFR_VAUX_FAULT BIT(6)
#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
+enum {
+ CFFPS_DEBUGFS_INPUT_HISTORY = 0,
+ CFFPS_DEBUGFS_FRU,
+ CFFPS_DEBUGFS_PN,
+ CFFPS_DEBUGFS_SN,
+ CFFPS_DEBUGFS_CCIN,
+ CFFPS_DEBUGFS_FW,
+ CFFPS_DEBUGFS_NUM_ENTRIES
+};
+
+struct ibm_cffps_input_history {
+ struct mutex update_lock;
+ unsigned long last_update;
+
+ u8 byte_count;
+ u8 data[CFFPS_INPUT_HISTORY_SIZE];
+};
+
+struct ibm_cffps {
+ struct i2c_client *client;
+
+ struct ibm_cffps_input_history input_history;
+
+ int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
+};
+
+#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
+
+static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
+ char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ int rc;
+ u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
+ u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
+ struct i2c_msg msg[2] = {
+ {
+ .addr = psu->client->addr,
+ .flags = psu->client->flags,
+ .len = 1,
+ .buf = msgbuf0,
+ }, {
+ .addr = psu->client->addr,
+ .flags = psu->client->flags | I2C_M_RD,
+ .len = CFFPS_INPUT_HISTORY_SIZE + 1,
+ .buf = msgbuf1,
+ },
+ };
+
+ if (!*ppos) {
+ mutex_lock(&psu->input_history.update_lock);
+ if (time_after(jiffies, psu->input_history.last_update + HZ)) {
+ /*
+ * Use a raw i2c transfer, since we need more bytes
+ * than Linux I2C supports through smbus xfr (only 32).
+ */
+ rc = i2c_transfer(psu->client->adapter, msg, 2);
+ if (rc < 0) {
+ mutex_unlock(&psu->input_history.update_lock);
+ return rc;
+ }
+
+ psu->input_history.byte_count = msgbuf1[0];
+ memcpy(psu->input_history.data, &msgbuf1[1],
+ CFFPS_INPUT_HISTORY_SIZE);
+ psu->input_history.last_update = jiffies;
+ }
+
+ mutex_unlock(&psu->input_history.update_lock);
+ }
+
+ return simple_read_from_buffer(buf, count, ppos,
+ psu->input_history.data,
+ psu->input_history.byte_count);
+}
+
+static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 cmd;
+ int i, rc;
+ int *idxp = file->private_data;
+ int idx = *idxp;
+ struct ibm_cffps *psu = to_psu(idxp, idx);
+ char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
+
+ switch (idx) {
+ case CFFPS_DEBUGFS_INPUT_HISTORY:
+ return ibm_cffps_read_input_history(psu, buf, count, ppos);
+ case CFFPS_DEBUGFS_FRU:
+ cmd = CFFPS_FRU_CMD;
+ break;
+ case CFFPS_DEBUGFS_PN:
+ cmd = CFFPS_PN_CMD;
+ break;
+ case CFFPS_DEBUGFS_SN:
+ cmd = CFFPS_SN_CMD;
+ break;
+ case CFFPS_DEBUGFS_CCIN:
+ rc = i2c_smbus_read_word_data(psu->client, CFFPS_CCIN_CMD);
+ if (rc < 0)
+ return rc;
+
+ rc = snprintf(data, 5, "%04X", rc);
+ goto done;
+ case CFFPS_DEBUGFS_FW:
+ for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
+ rc = i2c_smbus_read_byte_data(psu->client,
+ CFFPS_FW_CMD_START + i);
+ if (rc < 0)
+ return rc;
+
+ snprintf(&data[i * 2], 3, "%02X", rc);
+ }
+
+ rc = i * 2;
+ goto done;
+ default:
+ return -EINVAL;
+ }
+
+ rc = i2c_smbus_read_block_data(psu->client, cmd, data);
+ if (rc < 0)
+ return rc;
+
+done:
+ data[rc] = '\n';
+ rc += 2;
+
+ return simple_read_from_buffer(buf, count, ppos, data, rc);
+}
+
+static const struct file_operations ibm_cffps_fops = {
+ .llseek = noop_llseek,
+ .read = ibm_cffps_debugfs_op,
+ .open = simple_open,
+};
+
static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
int reg)
{
@@ -119,7 +271,55 @@ static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
static int ibm_cffps_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- return pmbus_do_probe(client, id, &ibm_cffps_info);
+ int i, rc;
+ struct dentry *debugfs;
+ struct dentry *ibm_cffps_dir;
+ struct ibm_cffps *psu;
+
+ rc = pmbus_do_probe(client, id, &ibm_cffps_info);
+ if (rc)
+ return rc;
+
+ /* Don't fail the probe if we can't create debugfs */
+ debugfs = pmbus_get_debugfs_dir(client);
+ if (!debugfs)
+ return 0;
+
+ ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
+ if (!ibm_cffps_dir)
+ return 0;
+
+ psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
+ if (!psu)
+ return 0;
+
+ psu->client = client;
+ mutex_init(&psu->input_history.update_lock);
+ psu->input_history.last_update = jiffies - HZ;
+
+ for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
+ psu->debugfs_entries[i] = i;
+
+ debugfs_create_file("input_history", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
+ &ibm_cffps_fops);
+ debugfs_create_file("fru", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
+ &ibm_cffps_fops);
+ debugfs_create_file("part_number", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
+ &ibm_cffps_fops);
+ debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
+ &ibm_cffps_fops);
+ debugfs_create_file("ccin", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
+ &ibm_cffps_fops);
+ debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
+ &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
+ &ibm_cffps_fops);
+
+ return 0;
}
static const struct i2c_device_id ibm_cffps_id[] = {