diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/pmbus/adm1266.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c index e129a88e58f5..c7b373ba92f2 100644 --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -15,12 +15,19 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/nvmem-consumer.h> +#include <linux/nvmem-provider.h> #include "pmbus.h" #include <linux/slab.h> +#include <linux/timekeeping.h> +#define ADM1266_BLACKBOX_CONFIG 0xD3 #define ADM1266_PDIO_CONFIG 0xD4 #define ADM1266_READ_STATE 0xD9 +#define ADM1266_READ_BLACKBOX 0xDE +#define ADM1266_SET_RTC 0xDF #define ADM1266_GPIO_CONFIG 0xE1 +#define ADM1266_BLACKBOX_INFO 0xE6 #define ADM1266_PDIO_STATUS 0xE9 #define ADM1266_GPIO_STATUS 0xEA @@ -37,6 +44,9 @@ #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 0 +#define ADM1266_BLACKBOX_SIZE 64 + #define ADM1266_PMBUS_BLOCK_MAX 255 struct adm1266_data { @@ -45,11 +55,22 @@ struct adm1266_data { 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; struct mutex buf_mutex; u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; }; +static const struct nvmem_cell_info adm1266_nvmem_cells[] = { + { + .name = "blackbox", + .offset = ADM1266_BLACKBOX_OFFSET, + .bytes = 2048, + }, +}; + DECLARE_CRC8_TABLE(pmbus_crc_table); /* @@ -325,6 +346,104 @@ static void adm1266_init_debugfs(struct adm1266_data *data) adm1266_state_read); } +static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff) +{ + int record_count; + char index; + u8 buf[5]; + int ret; + + ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf); + if (ret < 0) + return ret; + + if (ret != 4) + return -EIO; + + record_count = buf[3]; + + for (index = 0; index < record_count; index++) { + ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff); + if (ret < 0) + return ret; + + if (ret != ADM1266_BLACKBOX_SIZE) + return -EIO; + + read_buff += ADM1266_BLACKBOX_SIZE; + } + + return 0; +} + +static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val, size_t bytes) +{ + struct adm1266_data *data = priv; + int ret; + + if (offset + bytes > data->nvmem_config.size) + return -EINVAL; + + if (offset == 0) { + memset(data->dev_mem, 0, data->nvmem_config.size); + + ret = adm1266_nvmem_read_blackbox(data, data->dev_mem); + if (ret) { + dev_err(&data->client->dev, "Could not read blackbox!"); + 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 = adm1266_nvmem_cells[0].bytes; + + data->dev_mem = devm_kzalloc(&data->client->dev, data->nvmem_config.size, GFP_KERNEL); + if (!data->dev_mem) + return -ENOMEM; + + data->nvmem = devm_nvmem_register(&data->client->dev, &data->nvmem_config); + if (IS_ERR(data->nvmem)) { + dev_err(&data->client->dev, "Could not register nvmem!"); + return PTR_ERR(data->nvmem); + } + + return 0; +} + +static int adm1266_set_rtc(struct adm1266_data *data) +{ + time64_t kt; + char write_buf[6]; + int i; + + kt = ktime_get_seconds(); + + memset(write_buf, 0, sizeof(write_buf)); + + for (i = 0; i < 4; i++) + write_buf[2 + i] = (kt >> (i * 8)) & 0xFF; + + return i2c_smbus_write_block_data(data->client, ADM1266_SET_RTC, sizeof(write_buf), + write_buf); +} + static int adm1266_probe(struct i2c_client *client) { struct adm1266_data *data; @@ -348,6 +467,14 @@ static int adm1266_probe(struct i2c_client *client) if (ret < 0) return ret; + ret = adm1266_set_rtc(data); + if (ret < 0) + return ret; + + ret = adm1266_config_nvmem(data); + if (ret < 0) + return ret; + ret = pmbus_do_probe(client, &data->info); if (ret) return ret; |