diff options
Diffstat (limited to 'drivers/hwmon/sht3x.c')
| -rw-r--r-- | drivers/hwmon/sht3x.c | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/drivers/hwmon/sht3x.c b/drivers/hwmon/sht3x.c index 79657910b79e..c0d02fbcdb76 100644 --- a/drivers/hwmon/sht3x.c +++ b/drivers/hwmon/sht3x.c @@ -10,6 +10,7 @@ #include <asm/page.h> #include <linux/crc8.h> +#include <linux/debugfs.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/hwmon.h> @@ -41,6 +42,9 @@ static const unsigned char sht3x_cmd_heater_off[] = { 0x30, 0x66 }; /* other commands */ static const unsigned char sht3x_cmd_read_status_reg[] = { 0xf3, 0x2d }; static const unsigned char sht3x_cmd_clear_status_reg[] = { 0x30, 0x41 }; +static const unsigned char sht3x_cmd_read_serial_number[] = { 0x37, 0x80 }; + +static struct dentry *debugfs; /* delays for single-shot mode i2c commands, both in us */ #define SHT3X_SINGLE_WAIT_TIME_HPM 15000 @@ -163,12 +167,14 @@ struct sht3x_data { enum sht3x_chips chip_id; struct mutex i2c_lock; /* lock for sending i2c commands */ struct mutex data_lock; /* lock for updating driver data */ + struct dentry *sensor_dir; u8 mode; const unsigned char *command; u32 wait_time; /* in us*/ unsigned long last_update; /* last update in periodic mode*/ enum sht3x_repeatability repeatability; + u32 serial_number; /* * cached values for temperature and humidity and limits @@ -831,6 +837,40 @@ static int sht3x_write(struct device *dev, enum hwmon_sensor_types type, } } +static void sht3x_debugfs_init(struct sht3x_data *data) +{ + char name[32]; + + snprintf(name, sizeof(name), "i2c%u-%02x", + data->client->adapter->nr, data->client->addr); + data->sensor_dir = debugfs_create_dir(name, debugfs); + debugfs_create_u32("serial_number", 0444, + data->sensor_dir, &data->serial_number); +} + +static void sht3x_debugfs_remove(void *sensor_dir) +{ + debugfs_remove_recursive(sensor_dir); +} + +static int sht3x_serial_number_read(struct sht3x_data *data) +{ + int ret; + char buffer[SHT3X_RESPONSE_LENGTH]; + struct i2c_client *client = data->client; + + ret = sht3x_read_from_command(client, data, + sht3x_cmd_read_serial_number, + buffer, + SHT3X_RESPONSE_LENGTH, 0); + if (ret) + return ret; + + data->serial_number = (buffer[0] << 24) | (buffer[1] << 16) | + (buffer[3] << 8) | buffer[4]; + return ret; +} + static const struct hwmon_ops sht3x_ops = { .is_visible = sht3x_is_visible, .read = sht3x_read, @@ -899,6 +939,18 @@ static int sht3x_probe(struct i2c_client *client) if (ret) return ret; + ret = sht3x_serial_number_read(data); + if (ret) { + dev_dbg(dev, "unable to read serial number\n"); + } else { + sht3x_debugfs_init(data); + ret = devm_add_action_or_reset(dev, + sht3x_debugfs_remove, + data->sensor_dir); + if (ret) + return ret; + } + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, @@ -917,7 +969,19 @@ static struct i2c_driver sht3x_i2c_driver = { .id_table = sht3x_ids, }; -module_i2c_driver(sht3x_i2c_driver); +static int __init sht3x_init(void) +{ + debugfs = debugfs_create_dir("sht3x", NULL); + return i2c_add_driver(&sht3x_i2c_driver); +} +module_init(sht3x_init); + +static void __exit sht3x_cleanup(void) +{ + debugfs_remove_recursive(debugfs); + i2c_del_driver(&sht3x_i2c_driver); +} +module_exit(sht3x_cleanup); MODULE_AUTHOR("David Frey <david.frey@sensirion.com>"); MODULE_AUTHOR("Pascal Sachs <pascal.sachs@sensirion.com>"); |