[PATCH v3 5/6] hwmon: pmbus: adm1266: read blackbox
From: alexandru.tachici
Date: Fri May 29 2020 - 09:06:36 EST
From: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
Use the nvmem kernel api to expose the black box
chip functionality to userspace.
Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
---
drivers/hwmon/pmbus/adm1266.c | 160 ++++++++++++++++++++++++++++++++++
1 file changed, 160 insertions(+)
diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index 85d6795b79d3..831156004087 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -14,14 +14,19 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/nvmem-provider.h>
#include <linux/slab.h>
#include "pmbus.h"
+#define ADM1266_BLACKBOX_CONFIG 0xD3
#define ADM1266_PDIO_CONFIG 0xD4
#define ADM1266_GO_COMMAND 0xD8
#define ADM1266_READ_STATE 0xD9
+#define ADM1266_READ_BLACKBOX 0xDE
#define ADM1266_GPIO_CONFIG 0xE1
+#define ADM1266_BLACKBOX_INFO 0xE6
#define ADM1266_PDIO_STATUS 0xE9
#define ADM1266_GPIO_STATUS 0xEA
@@ -38,12 +43,26 @@
#define ADM1266_PDIO_GLITCH_FILT(x) FIELD_GET(GENMASK(12, 9), x)
#define ADM1266_PDIO_OUT_CFG(x) FIELD_GET(GENMASK(2, 0), x)
+#define ADM1266_BLACKBOX_OFFSET 0x7F700
+#define ADM1266_BLACKBOX_SIZE 64
+
struct adm1266_data {
struct pmbus_driver_info info;
struct gpio_chip gc;
const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
struct i2c_client *client;
struct dentry *debugfs_dir;
+ struct nvmem_config nvmem_config;
+ struct nvmem_device *nvmem;
+ u8 *dev_mem;
+};
+
+static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
+ {
+ .name = "blackbox",
+ .offset = ADM1266_BLACKBOX_OFFSET,
+ .bytes = 2048,
+ },
};
#if IS_ENABLED(CONFIG_GPIOLIB)
@@ -261,6 +280,28 @@ static int adm1266_set_go_command_op(void *pdata, u64 val)
return i2c_smbus_write_word_data(data->client, ADM1266_GO_COMMAND, reg);
}
+static int adm1266_blackbox_information_read(struct seq_file *s, void *pdata)
+{
+ struct device *dev = s->private;
+ struct i2c_client *client = to_i2c_client(dev);
+ u8 read_buf[PMBUS_BLOCK_MAX + 1];
+ unsigned int latest_id;
+ int ret;
+
+ ret = i2c_smbus_read_block_data(client, ADM1266_BLACKBOX_INFO,
+ read_buf);
+ if (ret < 0)
+ return ret;
+
+ seq_puts(s, "BLACKBOX_INFORMATION:\n");
+ latest_id = read_buf[0] + (read_buf[1] << 8);
+ seq_printf(s, "Black box ID: %x\n", latest_id);
+ seq_printf(s, "Logic index: %x\n", read_buf[2]);
+ seq_printf(s, "Record count: %x\n", read_buf[3]);
+
+ return 0;
+}
+
DEFINE_DEBUGFS_ATTRIBUTE(go_command_fops, NULL, adm1266_set_go_command_op,
"%llu\n");
DEFINE_DEBUGFS_ATTRIBUTE(read_state_fops, adm1266_get_state_op, NULL, "%llu\n");
@@ -277,6 +318,121 @@ static void adm1266_debug_init(struct adm1266_data *data)
&go_command_fops);
debugfs_create_file_unsafe("read_state", 0400, root, data,
&read_state_fops);
+ debugfs_create_devm_seqfile(&data->client->dev, "blackbox_information",
+ root, adm1266_blackbox_information_read);
+}
+
+static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *buf)
+{
+ u8 write_buf[PMBUS_BLOCK_MAX + 1];
+ u8 read_buf[PMBUS_BLOCK_MAX + 1];
+ int record_count;
+ int ret;
+ int i;
+
+ ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO,
+ read_buf);
+ if (ret < 0)
+ return ret;
+
+ record_count = read_buf[3];
+
+ for (i = 0; i < record_count; i++) {
+ write_buf[0] = i;
+ ret = pmbus_block_wr(data->client, ADM1266_READ_BLACKBOX, 1,
+ write_buf, buf);
+ if (ret < 0)
+ return ret;
+
+ buf += ADM1266_BLACKBOX_SIZE;
+ }
+
+ return 0;
+}
+
+static bool adm1266_cell_is_accessed(const struct nvmem_cell_info *mem_cell,
+ unsigned int offset, size_t bytes)
+{
+ unsigned int start_addr = offset;
+ unsigned int end_addr = offset + bytes;
+ unsigned int cell_start = mem_cell->offset;
+ unsigned int cell_end = mem_cell->offset + mem_cell->bytes;
+
+ if (start_addr <= cell_end && cell_start <= end_addr)
+ return true;
+
+ return false;
+}
+
+static int adm1266_read_mem_cell(struct adm1266_data *data,
+ const struct nvmem_cell_info *mem_cell)
+{
+ u8 *mem_offset;
+ int ret;
+
+ switch (mem_cell->offset) {
+ case ADM1266_BLACKBOX_OFFSET:
+ mem_offset = data->dev_mem + mem_cell->offset;
+ ret = adm1266_nvmem_read_blackbox(data, mem_offset);
+ if (ret)
+ dev_err(&data->client->dev, "Could not read blackbox!");
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ const struct nvmem_cell_info *mem_cell;
+ struct adm1266_data *data = priv;
+ int ret;
+ int i;
+
+ for (i = 0; i < data->nvmem_config.ncells; i++) {
+ mem_cell = &adm1266_nvmem_cells[i];
+ if (!adm1266_cell_is_accessed(mem_cell, offset, bytes))
+ continue;
+
+ ret = adm1266_read_mem_cell(data, mem_cell);
+ if (ret < 0)
+ return ret;
+ }
+
+ memcpy(val, data->dev_mem + offset, bytes);
+
+ return 0;
+}
+
+static int adm1266_config_nvmem(struct adm1266_data *data)
+{
+ data->nvmem_config.name = dev_name(&data->client->dev);
+ data->nvmem_config.dev = &data->client->dev;
+ data->nvmem_config.root_only = true;
+ data->nvmem_config.read_only = true;
+ data->nvmem_config.owner = THIS_MODULE;
+ data->nvmem_config.reg_read = adm1266_nvmem_read;
+ data->nvmem_config.cells = adm1266_nvmem_cells;
+ data->nvmem_config.ncells = ARRAY_SIZE(adm1266_nvmem_cells);
+ data->nvmem_config.priv = data;
+ data->nvmem_config.stride = 1;
+ data->nvmem_config.word_size = 1;
+ data->nvmem_config.size = 0x80000;
+
+ data->nvmem = nvmem_register(&data->nvmem_config);
+ if (IS_ERR(data->nvmem)) {
+ dev_err(&data->client->dev, "Could not register nvmem!");
+ return PTR_ERR(data->nvmem);
+ }
+
+ data->dev_mem = devm_kzalloc(&data->client->dev,
+ data->nvmem_config.size,
+ GFP_KERNEL);
+ if (!data->dev_mem)
+ return -ENOMEM;
+
+ return 0;
}
static int adm1266_probe(struct i2c_client *client,
@@ -299,6 +455,10 @@ static int adm1266_probe(struct i2c_client *client,
if (ret < 0)
return ret;
+ ret = adm1266_config_nvmem(data);
+ if (ret < 0)
+ return ret;
+
adm1266_debug_init(data);
info = &data->info;
--
2.20.1