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/* * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC. * * Note this IC is in some aspect similar to the LM90, but it has quite a * few differences too, for example the local temp has a higher resolution * and thus has 16 bits registers for its value and limit instead of 8 bits. */
#include <linux/bitops.h>#include <linux/err.h>#include <linux/i2c.h>#include <linux/hwmon.h>#include <linux/init.h>#include <linux/module.h>#include <linux/regmap.h>#include <linux/slab.h>
/* Addresses to scan */static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
/* * The TMP401 registers, note some registers have different addresses for * reading and writing */#define TMP401_STATUS 0x02#define TMP401_CONFIG 0x03#define TMP401_CONVERSION_RATE 0x04#define TMP4XX_N_FACTOR_REG 0x18#define TMP43X_BETA_RANGE 0x25#define TMP401_TEMP_CRIT_HYST 0x21#define TMP401_MANUFACTURER_ID_REG 0xFE#define TMP401_DEVICE_ID_REG 0xFF
static const u8 TMP401_TEMP_MSB[7][3] = { { 0x00, 0x01, 0x23 }, /* temp */ { 0x06, 0x08, 0x16 }, /* low limit */ { 0x05, 0x07, 0x15 }, /* high limit */ { 0x20, 0x19, 0x1a }, /* therm (crit) limit */ { 0x30, 0x34, 0x00 }, /* lowest */ { 0x32, 0xf6, 0x00 }, /* highest */};
/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */static const u8 TMP432_STATUS_REG[] = { 0x1b, 0x36, 0x35, 0x37 };
/* Flags */#define TMP401_CONFIG_RANGE BIT(2)#define TMP401_CONFIG_SHUTDOWN BIT(6)#define TMP401_STATUS_LOCAL_CRIT BIT(0)#define TMP401_STATUS_REMOTE_CRIT BIT(1)#define TMP401_STATUS_REMOTE_OPEN BIT(2)#define TMP401_STATUS_REMOTE_LOW BIT(3)#define TMP401_STATUS_REMOTE_HIGH BIT(4)#define TMP401_STATUS_LOCAL_LOW BIT(5)#define TMP401_STATUS_LOCAL_HIGH BIT(6)
/* On TMP432, each status has its own register */#define TMP432_STATUS_LOCAL BIT(0)#define TMP432_STATUS_REMOTE1 BIT(1)#define TMP432_STATUS_REMOTE2 BIT(2)
/* Manufacturer / Device ID's */#define TMP401_MANUFACTURER_ID 0x55#define TMP401_DEVICE_ID 0x11#define TMP411A_DEVICE_ID 0x12#define TMP411B_DEVICE_ID 0x13#define TMP411C_DEVICE_ID 0x10#define TMP431_DEVICE_ID 0x31#define TMP432_DEVICE_ID 0x32#define TMP435_DEVICE_ID 0x35
/* * Driver data (common to all clients) */
static const struct i2c_device_id tmp401_id[] = { { .name = "tmp401", .driver_data = tmp401 }, { .name = "tmp411", .driver_data = tmp411 }, { .name = "tmp431", .driver_data = tmp431 }, { .name = "tmp432", .driver_data = tmp432 }, { .name = "tmp435", .driver_data = tmp435 }, { }};MODULE_DEVICE_TABLE(i2c, tmp401_id);
/* * Client data (each client gets its own) */
struct tmp401_data { struct i2c_client *client; struct regmap *regmap; enum chips kind;
bool extended_range;
/* hwmon API configuration data */ u32 chip_channel_config[4]; struct hwmon_channel_info chip_info; u32 temp_channel_config[4]; struct hwmon_channel_info temp_info; const struct hwmon_channel_info *info[3]; struct hwmon_chip_info chip;};
/* regmap */
static bool tmp401_regmap_is_volatile(struct device *dev, unsigned int reg){ switch (reg) { case 0: /* local temp msb */ case 1: /* remote temp msb */ case 2: /* status */ case 0x10: /* remote temp lsb */ case 0x15: /* local temp lsb */ case 0x1b: /* status (tmp432) */ case 0x23 ... 0x24: /* remote temp 2 msb / lsb */ case 0x30 ... 0x37: /* lowest/highest temp; status (tmp432) */ return true; default: return false; }}
static int tmp401_reg_read(void *context, unsigned int reg, unsigned int *val){ struct tmp401_data *data = context; struct i2c_client *client = data->client; int regval;
switch (reg) { case 0: /* local temp msb */ case 1: /* remote temp msb */ case 5: /* local temp high limit msb */ case 6: /* local temp low limit msb */ case 7: /* remote temp ligh limit msb */ case 8: /* remote temp low limit msb */ case 0x15: /* remote temp 2 high limit msb */ case 0x16: /* remote temp 2 low limit msb */ case 0x23: /* remote temp 2 msb */ case 0x30: /* local temp minimum, tmp411 */ case 0x32: /* local temp maximum, tmp411 */ case 0x34: /* remote temp minimum, tmp411 */ case 0xf6: /* remote temp maximum, tmp411 (really 0x36) */ /* work around register overlap between TMP411 and TMP432 */ if (reg == 0xf6) reg = 0x36; regval = i2c_smbus_read_word_swapped(client, reg); if (regval < 0) return regval; *val = regval; break; case 0x19: /* critical limits, 8-bit registers */ case 0x1a: case 0x20: regval = i2c_smbus_read_byte_data(client, reg); if (regval < 0) return regval; *val = regval << 8; break; case 0x1b: case 0x35 ... 0x37: if (data->kind == tmp432) { regval = i2c_smbus_read_byte_data(client, reg); if (regval < 0) return regval; *val = regval; break; } /* simulate TMP432 status registers */ regval = i2c_smbus_read_byte_data(client, TMP401_STATUS); if (regval < 0) return regval; *val = 0; switch (reg) { case 0x1b: /* open / fault */ if (regval & TMP401_STATUS_REMOTE_OPEN) *val |= BIT(1); break; case 0x35: /* high limit */ if (regval & TMP401_STATUS_LOCAL_HIGH) *val |= BIT(0); if (regval & TMP401_STATUS_REMOTE_HIGH) *val |= BIT(1); break; case 0x36: /* low limit */ if (regval & TMP401_STATUS_LOCAL_LOW) *val |= BIT(0); if (regval & TMP401_STATUS_REMOTE_LOW) *val |= BIT(1); break; case 0x37: /* therm / crit limit */ if (regval & TMP401_STATUS_LOCAL_CRIT) *val |= BIT(0); if (regval & TMP401_STATUS_REMOTE_CRIT) *val |= BIT(1); break; } break; default: regval = i2c_smbus_read_byte_data(client, reg); if (regval < 0) return regval; *val = regval; break; } return 0;}
static int tmp401_reg_write(void *context, unsigned int reg, unsigned int val){ struct tmp401_data *data = context; struct i2c_client *client = data->client;
switch (reg) { case 0x05: /* local temp high limit msb */ case 0x06: /* local temp low limit msb */ case 0x07: /* remote temp ligh limit msb */ case 0x08: /* remote temp low limit msb */ reg += 6; /* adjust for register write address */ fallthrough; case 0x15: /* remote temp 2 high limit msb */ case 0x16: /* remote temp 2 low limit msb */ return i2c_smbus_write_word_swapped(client, reg, val); case 0x19: /* critical limits, 8-bit registers */ case 0x1a: case 0x20: return i2c_smbus_write_byte_data(client, reg, val >> 8); case TMP401_CONVERSION_RATE: case TMP401_CONFIG: reg += 6; /* adjust for register write address */ fallthrough; default: return i2c_smbus_write_byte_data(client, reg, val); }}
static const struct regmap_config tmp401_regmap_config = { .reg_bits = 8, .val_bits = 16, .cache_type = REGCACHE_MAPLE, .volatile_reg = tmp401_regmap_is_volatile, .reg_read = tmp401_reg_read, .reg_write = tmp401_reg_write,};
/* temperature conversion */
static int tmp401_register_to_temp(u16 reg, bool extended){ int temp = reg;
if (extended) temp -= 64 * 256;
return DIV_ROUND_CLOSEST(temp * 125, 32);}
static u16 tmp401_temp_to_register(long temp, bool extended, int zbits){ if (extended) { temp = clamp_val(temp, -64000, 191000); temp += 64000; } else { temp = clamp_val(temp, 0, 127000); }
return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;}
/* hwmon API functions */
static const u8 tmp401_temp_reg_index[] = { [hwmon_temp_input] = 0, [hwmon_temp_min] = 1, [hwmon_temp_max] = 2, [hwmon_temp_crit] = 3, [hwmon_temp_lowest] = 4, [hwmon_temp_highest] = 5,};
static const u8 tmp401_status_reg_index[] = { [hwmon_temp_fault] = 0, [hwmon_temp_min_alarm] = 1, [hwmon_temp_max_alarm] = 2, [hwmon_temp_crit_alarm] = 3,};
static int tmp401_temp_read(struct device *dev, u32 attr, int channel, long *val){ struct tmp401_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; unsigned int regs[2] = { TMP401_TEMP_MSB[3][channel], TMP401_TEMP_CRIT_HYST }; unsigned int regval; u16 regvals[2]; int reg, ret;
switch (attr) { case hwmon_temp_input: case hwmon_temp_min: case hwmon_temp_max: case hwmon_temp_crit: case hwmon_temp_lowest: case hwmon_temp_highest: reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel]; ret = regmap_read(regmap, reg, ®val); if (ret < 0) return ret; *val = tmp401_register_to_temp(regval, data->extended_range); break; case hwmon_temp_crit_hyst: ret = regmap_multi_reg_read(regmap, regs, regvals, 2); if (ret < 0) return ret; *val = tmp401_register_to_temp(regvals[0], data->extended_range) - (regvals[1] * 1000); break; case hwmon_temp_fault: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_crit_alarm: reg = TMP432_STATUS_REG[tmp401_status_reg_index[attr]]; ret = regmap_read(regmap, reg, ®val); if (ret < 0) return ret; *val = !!(regval & BIT(channel)); break; default: return -EOPNOTSUPP; } return 0;}
static int tmp401_temp_write(struct device *dev, u32 attr, int channel, long val){ struct tmp401_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; unsigned int regval; int reg, ret, temp;
switch (attr) { case hwmon_temp_min: case hwmon_temp_max: case hwmon_temp_crit: reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel]; regval = tmp401_temp_to_register(val, data->extended_range, attr == hwmon_temp_crit ? 8 : 4); ret = regmap_write(regmap, reg, regval); break; case hwmon_temp_crit_hyst: if (data->extended_range) val = clamp_val(val, -64000, 191000); else val = clamp_val(val, 0, 127000);
reg = TMP401_TEMP_MSB[3][channel]; ret = regmap_read(regmap, reg, ®val); if (ret < 0) break; temp = tmp401_register_to_temp(regval, data->extended_range); val = clamp_val(val, temp - 255000, temp); regval = ((temp - val) + 500) / 1000; ret = regmap_write(regmap, TMP401_TEMP_CRIT_HYST, regval); break; default: ret = -EOPNOTSUPP; break; } return ret;}
static int tmp401_chip_read(struct device *dev, u32 attr, int channel, long *val){ struct tmp401_data *data = dev_get_drvdata(dev); u32 regval; int ret;
switch (attr) { case hwmon_chip_update_interval: ret = regmap_read(data->regmap, TMP401_CONVERSION_RATE, ®val); if (ret < 0) return ret; *val = (1 << (7 - min(regval, 7))) * 125; break; case hwmon_chip_temp_reset_history: *val = 0; break; default: return -EOPNOTSUPP; }
return 0;}
static int tmp401_set_convrate(struct regmap *regmap, long val){ int rate;
/* * For valid rates, interval can be calculated as * interval = (1 << (7 - rate)) * 125; * Rounded rate is therefore * rate = 7 - __fls(interval * 4 / (125 * 3)); * Use clamp_val() to avoid overflows, and to ensure valid input * for __fls. */ val = clamp_val(val, 125, 16000); rate = 7 - __fls(val * 4 / (125 * 3)); return regmap_write(regmap, TMP401_CONVERSION_RATE, rate);}
static int tmp401_chip_write(struct device *dev, u32 attr, int channel, long val){ struct tmp401_data *data = dev_get_drvdata(dev); struct regmap *regmap = data->regmap; int err;
switch (attr) { case hwmon_chip_update_interval: err = tmp401_set_convrate(regmap, val); break; case hwmon_chip_temp_reset_history: if (val != 1) { err = -EINVAL; break; } /* * Reset history by writing any value to any of the * minimum/maximum registers (0x30-0x37). */ err = regmap_write(regmap, 0x30, 0); break; default: err = -EOPNOTSUPP; break; } return err;}
static int tmp401_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val){ switch (type) { case hwmon_chip: return tmp401_chip_read(dev, attr, channel, val); case hwmon_temp: return tmp401_temp_read(dev, attr, channel, val); default: return -EOPNOTSUPP; }}
static int tmp401_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val){ switch (type) { case hwmon_chip: return tmp401_chip_write(dev, attr, channel, val); case hwmon_temp: return tmp401_temp_write(dev, attr, channel, val); default: return -EOPNOTSUPP; }}
static umode_t tmp401_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel){ switch (type) { case hwmon_chip: switch (attr) { case hwmon_chip_update_interval: case hwmon_chip_temp_reset_history: return 0644; default: break; } break; case hwmon_temp: switch (attr) { case hwmon_temp_input: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_crit_alarm: case hwmon_temp_fault: case hwmon_temp_lowest: case hwmon_temp_highest: return 0444; case hwmon_temp_min: case hwmon_temp_max: case hwmon_temp_crit: case hwmon_temp_crit_hyst: return 0644; default: break; } break; default: break; } return 0;}
static const struct hwmon_ops tmp401_ops = { .is_visible = tmp401_is_visible, .read = tmp401_read, .write = tmp401_write,};
/* chip initialization, detect, probe */
static int tmp401_init_client(struct tmp401_data *data){ struct regmap *regmap = data->regmap; u32 config, config_orig; int ret; u32 val = 0; s32 nfactor = 0;
/* Set conversion rate to 2 Hz */ ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5); if (ret < 0) return ret;
/* Start conversions (disable shutdown if necessary) */ ret = regmap_read(regmap, TMP401_CONFIG, &config); if (ret < 0) return ret;
config_orig = config; config &= ~TMP401_CONFIG_SHUTDOWN;
if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) { /* Enable measurement over extended temperature range */ config |= TMP401_CONFIG_RANGE; }
data->extended_range = !!(config & TMP401_CONFIG_RANGE);
if (config != config_orig) { ret = regmap_write(regmap, TMP401_CONFIG, config); if (ret < 0) return ret; }
ret = of_property_read_s32(data->client->dev.of_node, "ti,n-factor", &nfactor); if (!ret) { if (data->kind == tmp401) { dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n"); return -EINVAL; } if (nfactor < -128 || nfactor > 127) { dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor); return -EINVAL; } ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor); if (ret < 0) return ret; }
ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val); if (!ret) { if (data->kind == tmp401 || data->kind == tmp411) { dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n"); return -EINVAL; } if (val > 15) { dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val); return -EINVAL; } ret = regmap_write(regmap, TMP43X_BETA_RANGE, val); if (ret < 0) return ret; }
return 0;}
static int tmp401_detect(struct i2c_client *client, struct i2c_board_info *info){ enum chips kind; struct i2c_adapter *adapter = client->adapter; u8 reg;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV;
/* Detect and identify the chip */ reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG); if (reg != TMP401_MANUFACTURER_ID) return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
switch (reg) { case TMP401_DEVICE_ID: if (client->addr != 0x4c) return -ENODEV; kind = tmp401; break; case TMP411A_DEVICE_ID: if (client->addr != 0x4c) return -ENODEV; kind = tmp411; break; case TMP411B_DEVICE_ID: if (client->addr != 0x4d) return -ENODEV; kind = tmp411; break; case TMP411C_DEVICE_ID: if (client->addr != 0x4e) return -ENODEV; kind = tmp411; break; case TMP431_DEVICE_ID: if (client->addr != 0x4c && client->addr != 0x4d) return -ENODEV; kind = tmp431; break; case TMP432_DEVICE_ID: if (client->addr != 0x4c && client->addr != 0x4d) return -ENODEV; kind = tmp432; break; case TMP435_DEVICE_ID: kind = tmp435; break; default: return -ENODEV; }
reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG); if (reg & 0x1b) return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE); /* Datasheet says: 0x1-0x6 */ if (reg > 15) return -ENODEV;
strscpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
return 0;}
static int tmp401_probe(struct i2c_client *client){ static const char * const names[] = { "TMP401", "TMP411", "TMP431", "TMP432", "TMP435" }; struct device *dev = &client->dev; struct hwmon_channel_info *info; struct device *hwmon_dev; struct tmp401_data *data; int status;
data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL); if (!data) return -ENOMEM;
data->client = client; data->kind = (uintptr_t)i2c_get_match_data(client);
data->regmap = devm_regmap_init(dev, NULL, data, &tmp401_regmap_config); if (IS_ERR(data->regmap)) return PTR_ERR(data->regmap);
/* initialize configuration data */ data->chip.ops = &tmp401_ops; data->chip.info = data->info;
data->info[0] = &data->chip_info; data->info[1] = &data->temp_info;
info = &data->chip_info; info->type = hwmon_chip; info->config = data->chip_channel_config;
data->chip_channel_config[0] = HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL;
info = &data->temp_info; info->type = hwmon_temp; info->config = data->temp_channel_config;
data->temp_channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM; data->temp_channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
if (data->kind == tmp411) { data->temp_channel_config[0] |= HWMON_T_HIGHEST | HWMON_T_LOWEST; data->temp_channel_config[1] |= HWMON_T_HIGHEST | HWMON_T_LOWEST; data->chip_channel_config[0] |= HWMON_C_TEMP_RESET_HISTORY; }
if (data->kind == tmp432) { data->temp_channel_config[2] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT; }
/* Initialize the TMP401 chip */ status = tmp401_init_client(data); if (status < 0) return status;
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &data->chip, NULL); if (IS_ERR(hwmon_dev)) return PTR_ERR(hwmon_dev);
dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
return 0;}
static const struct of_device_id __maybe_unused tmp4xx_of_match[] = { { .compatible = "ti,tmp401", }, { .compatible = "ti,tmp411", }, { .compatible = "ti,tmp431", }, { .compatible = "ti,tmp432", }, { .compatible = "ti,tmp435", }, { },};MODULE_DEVICE_TABLE(of, tmp4xx_of_match);
static struct i2c_driver tmp401_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "tmp401", .of_match_table = of_match_ptr(tmp4xx_of_match), }, .probe = tmp401_probe, .id_table = tmp401_id, .detect = tmp401_detect, .address_list = normal_i2c,};
module_i2c_driver(tmp401_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");MODULE_LICENSE("GPL");