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#include <linux/bitfield.h>#include <linux/delay.h>#include <linux/device.h>#include <linux/err.h>#include <linux/hwmon.h>#include <linux/module.h>#include <linux/i2c.h>#include <linux/i3c/device.h>#include <linux/init.h>#include <linux/jiffies.h>#include <linux/regmap.h>#include <linux/regulator/consumer.h>#include <linux/slab.h>#include <linux/util_macros.h>
#define DRIVER_NAME "tmp108"
#define TMP108_REG_TEMP 0x00#define TMP108_REG_CONF 0x01#define TMP108_REG_TLOW 0x02#define TMP108_REG_THIGH 0x03
#define TMP108_TEMP_MIN_MC -50000 /* Minimum millicelcius. */#define TMP108_TEMP_MAX_MC 127937 /* Maximum millicelcius. */
/* Configuration register bits. * Note: these bit definitions are byte swapped. */#define TMP108_CONF_M0 0x0100 /* Sensor mode. */#define TMP108_CONF_M1 0x0200#define TMP108_CONF_TM 0x0400 /* Thermostat mode. */#define TMP108_CONF_FL 0x0800 /* Watchdog flag - TLOW */#define TMP108_CONF_FH 0x1000 /* Watchdog flag - THIGH */#define TMP108_CONF_CR0 0x2000 /* Conversion rate. */#define TMP108_CONF_CR1 0x4000#define TMP108_CONF_ID 0x8000#define TMP108_CONF_HYS0 0x0010 /* Hysteresis. */#define TMP108_CONF_HYS1 0x0020#define TMP108_CONF_POL 0x0080 /* Polarity of alert. */
/* Defaults set by the hardware upon reset. */#define TMP108_CONF_DEFAULTS (TMP108_CONF_CR0 | TMP108_CONF_TM |\ TMP108_CONF_HYS0 | TMP108_CONF_M1)/* These bits are read-only. */#define TMP108_CONF_READ_ONLY (TMP108_CONF_FL | TMP108_CONF_FH |\ TMP108_CONF_ID)
#define TMP108_CONF_MODE_MASK (TMP108_CONF_M0|TMP108_CONF_M1)#define TMP108_MODE_SHUTDOWN 0x0000#define TMP108_MODE_ONE_SHOT TMP108_CONF_M0#define TMP108_MODE_CONTINUOUS TMP108_CONF_M1 /* Default */ /* When M1 is set, M0 is ignored. */
#define TMP108_CONF_CONVRATE_MASK (TMP108_CONF_CR0|TMP108_CONF_CR1)#define TMP108_CONVRATE_0P25HZ 0x0000#define TMP108_CONVRATE_1HZ TMP108_CONF_CR0 /* Default */#define TMP108_CONVRATE_4HZ TMP108_CONF_CR1#define TMP108_CONVRATE_16HZ (TMP108_CONF_CR0|TMP108_CONF_CR1)
#define TMP108_CONF_HYSTERESIS_MASK (TMP108_CONF_HYS0|TMP108_CONF_HYS1)#define TMP108_HYSTERESIS_0C 0x0000#define TMP108_HYSTERESIS_1C TMP108_CONF_HYS0 /* Default */#define TMP108_HYSTERESIS_2C TMP108_CONF_HYS1#define TMP108_HYSTERESIS_4C (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
#define TMP108_CONVERSION_TIME_MS 30 /* in milli-seconds */
#define TMP108_CONF_CR0_POS 13#define TMP108_CONF_CR1_POS 14#define TMP108_CONF_CONVRATE_FLD GENMASK(TMP108_CONF_CR1_POS, TMP108_CONF_CR0_POS)
struct tmp108 { struct regmap *regmap; u16 orig_config; u64 ready_time; const struct tmp108_params *params;};
struct tmp108_params { bool config_reg_16bits; const u16 *sample_times; size_t n_sample_times;};
static const u16 p3t1035_sample_times[] = {4000, 1000, 250, 125};static const u16 tmp108_sample_times[] = {4000, 1000, 250, 63};
static const struct tmp108_params p3t1035_data = { .sample_times = p3t1035_sample_times, .n_sample_times = ARRAY_SIZE(p3t1035_sample_times), .config_reg_16bits = false,};
static const struct tmp108_params tmp108_data = { .sample_times = tmp108_sample_times, .n_sample_times = ARRAY_SIZE(tmp108_sample_times), .config_reg_16bits = true,};
/* convert 12-bit TMP108 register value to milliCelsius */static inline int tmp108_temp_reg_to_mC(s16 val){ return (val & ~0x0f) * 1000 / 256;}
/* convert milliCelsius to left adjusted 12-bit TMP108 register value */static inline u16 tmp108_mC_to_temp_reg(int val){ return (val * 256) / 1000;}
static int tmp108_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *temp){ struct tmp108 *tmp108 = dev_get_drvdata(dev); unsigned int regval; int err, hyst;
if (type == hwmon_chip) { if (attr == hwmon_chip_update_interval) { err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val); if (err < 0) return err; *temp = tmp108->params->sample_times[FIELD_GET(TMP108_CONF_CONVRATE_FLD, regval)]; return 0; } return -EOPNOTSUPP; }
switch (attr) { case hwmon_temp_input: /* Is it too early to return a conversion ? */ if (time_before64(get_jiffies_64(), tmp108->ready_time)) { dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); return -EAGAIN; } err = regmap_read(tmp108->regmap, TMP108_REG_TEMP, ®val); if (err < 0) return err; *temp = tmp108_temp_reg_to_mC(regval); break; case hwmon_temp_min: case hwmon_temp_max: err = regmap_read(tmp108->regmap, attr == hwmon_temp_min ? TMP108_REG_TLOW : TMP108_REG_THIGH, ®val); if (err < 0) return err; *temp = tmp108_temp_reg_to_mC(regval); break; case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val); if (err < 0) return err; *temp = !!(regval & (attr == hwmon_temp_min_alarm ? TMP108_CONF_FL : TMP108_CONF_FH)); break; case hwmon_temp_min_hyst: case hwmon_temp_max_hyst: err = regmap_read(tmp108->regmap, TMP108_REG_CONF, ®val); if (err < 0) return err; switch (regval & TMP108_CONF_HYSTERESIS_MASK) { case TMP108_HYSTERESIS_0C: default: hyst = 0; break; case TMP108_HYSTERESIS_1C: hyst = 1000; break; case TMP108_HYSTERESIS_2C: hyst = 2000; break; case TMP108_HYSTERESIS_4C: hyst = 4000; break; } err = regmap_read(tmp108->regmap, attr == hwmon_temp_min_hyst ? TMP108_REG_TLOW : TMP108_REG_THIGH, ®val); if (err < 0) return err; *temp = tmp108_temp_reg_to_mC(regval); if (attr == hwmon_temp_min_hyst) *temp += hyst; else *temp -= hyst; break; default: return -EOPNOTSUPP; }
return 0;}
static int tmp108_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long temp){ struct tmp108 *tmp108 = dev_get_drvdata(dev); u32 regval, mask; size_t len; u8 index; int err;
if (type == hwmon_chip) { if (attr == hwmon_chip_update_interval) { len = tmp108->params->n_sample_times; index = find_closest_descending(temp, tmp108->params->sample_times, len); return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF, TMP108_CONF_CONVRATE_MASK, FIELD_PREP(TMP108_CONF_CONVRATE_FLD, index)); } return -EOPNOTSUPP; }
switch (attr) { case hwmon_temp_min: case hwmon_temp_max: temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC); return regmap_write(tmp108->regmap, attr == hwmon_temp_min ? TMP108_REG_TLOW : TMP108_REG_THIGH, tmp108_mC_to_temp_reg(temp)); case hwmon_temp_min_hyst: case hwmon_temp_max_hyst: temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC); err = regmap_read(tmp108->regmap, attr == hwmon_temp_min_hyst ? TMP108_REG_TLOW : TMP108_REG_THIGH, ®val); if (err < 0) return err; if (attr == hwmon_temp_min_hyst) temp -= tmp108_temp_reg_to_mC(regval); else temp = tmp108_temp_reg_to_mC(regval) - temp; if (temp < 500) mask = TMP108_HYSTERESIS_0C; else if (temp < 1500) mask = TMP108_HYSTERESIS_1C; else if (temp < 3000) mask = TMP108_HYSTERESIS_2C; else mask = TMP108_HYSTERESIS_4C; return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF, TMP108_CONF_HYSTERESIS_MASK, mask); default: return -EOPNOTSUPP; }}
static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel){ const struct tmp108 *tmp108 = data;
if (type == hwmon_chip && attr == hwmon_chip_update_interval) return 0644;
if (type != hwmon_temp) return 0;
switch (attr) { case hwmon_temp_input: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: return 0444; case hwmon_temp_min: case hwmon_temp_max: return 0644; case hwmon_temp_min_hyst: case hwmon_temp_max_hyst: if (!tmp108->params->config_reg_16bits) return 0; return 0644; default: return 0; }}
static const struct hwmon_channel_info * const tmp108_info[] = { HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST | HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM), NULL};
static const struct hwmon_ops tmp108_hwmon_ops = { .is_visible = tmp108_is_visible, .read = tmp108_read, .write = tmp108_write,};
static const struct hwmon_chip_info tmp108_chip_info = { .ops = &tmp108_hwmon_ops, .info = tmp108_info,};
static void tmp108_restore_config(void *data){ struct tmp108 *tmp108 = data;
regmap_write(tmp108->regmap, TMP108_REG_CONF, tmp108->orig_config);}
static bool tmp108_is_writeable_reg(struct device *dev, unsigned int reg){ return reg != TMP108_REG_TEMP;}
static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg){ /* Configuration register must be volatile to enable FL and FH. */ return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;}
static int tmp108_i2c_reg_read(void *context, unsigned int reg, unsigned int *val){ struct i2c_client *client = context; struct tmp108 *tmp108 = i2c_get_clientdata(client); int ret;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits) { ret = i2c_smbus_read_byte_data(client, TMP108_REG_CONF); if (ret < 0) return ret; *val = ret << 8; return 0; }
ret = i2c_smbus_read_word_swapped(client, reg); if (ret < 0) return ret; *val = ret; return 0;}
static int tmp108_i2c_reg_write(void *context, unsigned int reg, unsigned int val){ struct i2c_client *client = context; struct tmp108 *tmp108 = i2c_get_clientdata(client);
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits) return i2c_smbus_write_byte_data(client, reg, val >> 8); return i2c_smbus_write_word_swapped(client, reg, val);}
static const struct regmap_bus tmp108_i2c_regmap_bus = { .reg_read = tmp108_i2c_reg_read, .reg_write = tmp108_i2c_reg_write,};
static int tmp108_i3c_reg_read(void *context, unsigned int reg, unsigned int *val){ struct i3c_device *i3cdev = context; struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev); u8 reg_buf[1], val_buf[2]; struct i3c_xfer xfers[] = { { .rnw = false, .len = 1, .data.out = reg_buf, }, { .rnw = true, .len = 2, .data.in = val_buf, }, }; int ret;
reg_buf[0] = reg;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits) xfers[1].len--;
ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR); if (ret < 0) return ret;
*val = val_buf[0] << 8; if (reg != TMP108_REG_CONF || tmp108->params->config_reg_16bits) *val |= val_buf[1];
return 0;}
static int tmp108_i3c_reg_write(void *context, unsigned int reg, unsigned int val){ struct i3c_device *i3cdev = context; struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev); u8 val_buf[3]; struct i3c_xfer xfers[] = { { .rnw = false, .len = 3, .data.out = val_buf, }, };
val_buf[0] = reg; val_buf[1] = (val >> 8) & 0xff;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits) xfers[0].len--; else val_buf[2] = val & 0xff;
return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);}
static const struct regmap_bus tmp108_i3c_regmap_bus = { .reg_read = tmp108_i3c_reg_read, .reg_write = tmp108_i3c_reg_write,};
static const struct regmap_config tmp108_regmap_config = { .reg_bits = 8, .val_bits = 16, .max_register = TMP108_REG_THIGH, .writeable_reg = tmp108_is_writeable_reg, .volatile_reg = tmp108_is_volatile_reg, .val_format_endian = REGMAP_ENDIAN_BIG, .cache_type = REGCACHE_MAPLE, .use_single_read = true, .use_single_write = true,};
static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name, const struct tmp108_params *params){ struct device *hwmon_dev; struct tmp108 *tmp108; u32 config; int err;
err = devm_regulator_get_enable(dev, "vcc"); if (err) return dev_err_probe(dev, err, "Failed to enable regulator\n");
tmp108 = devm_kzalloc(dev, sizeof(*tmp108), GFP_KERNEL); if (!tmp108) return -ENOMEM;
dev_set_drvdata(dev, tmp108); tmp108->regmap = regmap; tmp108->params = params;
err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config); if (err < 0) { dev_err(dev, "error reading config register: %d", err); return err; } tmp108->orig_config = config;
/* Only continuous mode is supported. */ config &= ~TMP108_CONF_MODE_MASK; config |= TMP108_MODE_CONTINUOUS; /* Only comparator mode is supported. */ config &= ~TMP108_CONF_TM;
err = regmap_write(tmp108->regmap, TMP108_REG_CONF, config); if (err < 0) { dev_err(dev, "error writing config register: %d", err); return err; }
tmp108->ready_time = get_jiffies_64(); if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) == TMP108_MODE_SHUTDOWN) tmp108->ready_time += msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108); if (err) { dev_err(dev, "add action or reset failed: %d", err); return err; }
hwmon_dev = devm_hwmon_device_register_with_info(dev, name, tmp108, &tmp108_chip_info, NULL); return PTR_ERR_OR_ZERO(hwmon_dev);}
static int tmp108_probe(struct i2c_client *client){ struct device *dev = &client->dev; struct regmap *regmap;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return dev_err_probe(dev, -ENODEV, "adapter doesn't support SMBus word transactions\n");
regmap = devm_regmap_init(dev, &tmp108_i2c_regmap_bus, client, &tmp108_regmap_config); if (IS_ERR(regmap)) return dev_err_probe(dev, PTR_ERR(regmap), "regmap init failed");
return tmp108_common_probe(dev, regmap, client->name, i2c_get_match_data(client));}
static int tmp108_suspend(struct device *dev){ struct tmp108 *tmp108 = dev_get_drvdata(dev);
return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF, TMP108_CONF_MODE_MASK, TMP108_MODE_SHUTDOWN);}
static int tmp108_resume(struct device *dev){ struct tmp108 *tmp108 = dev_get_drvdata(dev); int err;
err = regmap_update_bits(tmp108->regmap, TMP108_REG_CONF, TMP108_CONF_MODE_MASK, TMP108_MODE_CONTINUOUS); tmp108->ready_time = get_jiffies_64() + msecs_to_jiffies(TMP108_CONVERSION_TIME_MS); return err;}
static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
static const struct i2c_device_id tmp108_i2c_ids[] = { { .name = "p3t1035", .driver_data = (unsigned long)&p3t1035_data }, { .name = "p3t1085", .driver_data = (unsigned long)&tmp108_data }, { .name = "tmp108", .driver_data = (unsigned long)&tmp108_data }, { }};MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);
static const struct of_device_id tmp108_of_ids[] = { { .compatible = "nxp,p3t1035", .data = &p3t1035_data }, { .compatible = "nxp,p3t1085", .data = &tmp108_data }, { .compatible = "ti,tmp108", .data = &tmp108_data }, {}};MODULE_DEVICE_TABLE(of, tmp108_of_ids);
static struct i2c_driver tmp108_driver = { .driver = { .name = DRIVER_NAME, .pm = pm_sleep_ptr(&tmp108_dev_pm_ops), .of_match_table = tmp108_of_ids, }, .probe = tmp108_probe, .id_table = tmp108_i2c_ids,};
static const struct i3c_device_id p3t1085_i3c_ids[] = { I3C_DEVICE(0x011B, 0x1529, &tmp108_data), I3C_DEVICE(0x011B, 0x152B, &p3t1035_data), {}};MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
static int p3t1085_i3c_probe(struct i3c_device *i3cdev){ struct device *dev = i3cdev_to_dev(i3cdev); struct regmap *regmap; const struct i3c_device_id *id;
regmap = devm_regmap_init(dev, &tmp108_i3c_regmap_bus, i3cdev, &tmp108_regmap_config); if (IS_ERR(regmap)) return dev_err_probe(dev, PTR_ERR(regmap), "Failed to register i3c regmap\n");
id = i3c_device_match_id(i3cdev, p3t1085_i3c_ids);
return tmp108_common_probe(dev, regmap, "p3t1085_i3c", id->data);}
static struct i3c_driver p3t1085_driver = { .driver = { .name = "p3t1085_i3c", }, .probe = p3t1085_i3c_probe, .id_table = p3t1085_i3c_ids,};
module_i3c_i2c_driver(p3t1085_driver, &tmp108_driver)
MODULE_AUTHOR("John Muir <john@jmuir.com>");MODULE_DESCRIPTION("Texas Instruments TMP108 temperature sensor driver");MODULE_LICENSE("GPL");