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path: root/drivers/iio/temperature/mlx90632.c
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Diffstat (limited to 'drivers/iio/temperature/mlx90632.c')
-rw-r--r--drivers/iio/temperature/mlx90632.c283
1 files changed, 254 insertions, 29 deletions
diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
index 51b812bcff2e..503fe54a0bb9 100644
--- a/drivers/iio/temperature/mlx90632.c
+++ b/drivers/iio/temperature/mlx90632.c
@@ -10,7 +10,9 @@
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
+#include <linux/iopoll.h>
#include <linux/kernel.h>
+#include <linux/limits.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/of.h>
@@ -58,6 +60,8 @@
/* Control register address - volatile */
#define MLX90632_REG_CONTROL 0x3001 /* Control Register address */
#define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */
+#define MLX90632_CFG_MTYP_MASK GENMASK(8, 4) /* Meas select Mask */
+
/* PowerModes statuses */
#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
@@ -65,6 +69,18 @@
#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/
+/* Measurement types */
+#define MLX90632_MTYP_MEDICAL 0
+#define MLX90632_MTYP_EXTENDED 17
+
+/* Measurement type select*/
+#define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4)
+#define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL)
+#define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED)
+
+/* I2C command register - volatile */
+#define MLX90632_REG_I2C_CMD 0x3005 /* I2C command Register address */
+
/* Device status register - volatile */
#define MLX90632_REG_STATUS 0x3fff /* Device status register */
#define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */
@@ -78,26 +94,53 @@
#define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1)
#define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2)
+/* Name important RAM_MEAS channels */
+#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17)
+#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19)
+#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19)
+
/* Magic constants */
#define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */
#define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */
+#define MLX90632_ID_EXTENDED 0x0505 /* EEPROM DSPv5 Extended range device id */
+#define MLX90632_ID_MASK GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */
#define MLX90632_DSP_VERSION 5 /* DSP version */
#define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */
#define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */
-#define MLX90632_REF_12 12LL /**< ResCtrlRef value of Ch 1 or Ch 2 */
-#define MLX90632_REF_3 12LL /**< ResCtrlRef value of Channel 3 */
-#define MLX90632_MAX_MEAS_NUM 31 /**< Maximum measurements in list */
-#define MLX90632_SLEEP_DELAY_MS 3000 /**< Autosleep delay */
+#define MLX90632_REF_12 12LL /* ResCtrlRef value of Ch 1 or Ch 2 */
+#define MLX90632_REF_3 12LL /* ResCtrlRef value of Channel 3 */
+#define MLX90632_MAX_MEAS_NUM 31 /* Maximum measurements in list */
+#define MLX90632_SLEEP_DELAY_MS 3000 /* Autosleep delay */
+#define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */
+/**
+ * struct mlx90632_data - private data for the MLX90632 device
+ * @client: I2C client of the device
+ * @lock: Internal mutex for multiple reads for single measurement
+ * @regmap: Regmap of the device
+ * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1.
+ * @mtyp: Measurement type physical sensor configuration for extended range
+ * calculations
+ * @object_ambient_temperature: Ambient temperature at object (might differ of
+ * the ambient temperature of sensor.
+ */
struct mlx90632_data {
struct i2c_client *client;
- struct mutex lock; /* Multiple reads for single measurement */
+ struct mutex lock;
struct regmap *regmap;
u16 emissivity;
+ u8 mtyp;
+ u32 object_ambient_temperature;
};
static const struct regmap_range mlx90632_volatile_reg_range[] = {
regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+ regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
regmap_reg_range(MLX90632_RAM_1(0),
MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
@@ -113,6 +156,7 @@ static const struct regmap_range mlx90632_read_reg_range[] = {
regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR),
regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb),
regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+ regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD),
regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
regmap_reg_range(MLX90632_RAM_1(0),
MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
@@ -173,25 +217,19 @@ static s32 mlx90632_pwr_continuous(struct regmap *regmap)
*/
static int mlx90632_perform_measurement(struct mlx90632_data *data)
{
- int ret, tries = 100;
unsigned int reg_status;
+ int ret;
ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS,
MLX90632_STAT_DATA_RDY, 0);
if (ret < 0)
return ret;
- while (tries-- > 0) {
- ret = regmap_read(data->regmap, MLX90632_REG_STATUS,
- &reg_status);
- if (ret < 0)
- return ret;
- if (reg_status & MLX90632_STAT_DATA_RDY)
- break;
- usleep_range(10000, 11000);
- }
+ ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status,
+ !(reg_status & MLX90632_STAT_DATA_RDY), 10000,
+ 100 * 10000);
- if (tries < 0) {
+ if (ret < 0) {
dev_err(&data->client->dev, "data not ready");
return -ETIMEDOUT;
}
@@ -199,6 +237,26 @@ static int mlx90632_perform_measurement(struct mlx90632_data *data)
return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
}
+static int mlx90632_set_meas_type(struct regmap *regmap, u8 type)
+{
+ int ret;
+
+ if ((type != MLX90632_MTYP_MEDICAL) && (type != MLX90632_MTYP_EXTENDED))
+ return -EINVAL;
+
+ ret = regmap_write(regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL,
+ (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
+ (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));
+ if (ret < 0)
+ return ret;
+
+ return mlx90632_pwr_continuous(regmap);
+}
+
static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
uint8_t *channel_old)
{
@@ -300,6 +358,97 @@ read_unlock:
return ret;
}
+static int mlx90632_read_ambient_raw_extended(struct regmap *regmap,
+ s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+ unsigned int read_tmp;
+ int ret;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp);
+ if (ret < 0)
+ return ret;
+ *ambient_new_raw = (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp);
+ if (ret < 0)
+ return ret;
+ *ambient_old_raw = (s16)read_tmp;
+
+ return 0;
+}
+
+static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw)
+{
+ unsigned int read_tmp;
+ s32 read;
+ int ret;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = read - (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = read - (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = (read + (s16)read_tmp) / 2;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = read + (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = read + (s16)read_tmp;
+
+ if (read > S16_MAX || read < S16_MIN)
+ return -ERANGE;
+
+ *object_new_raw = read;
+
+ return 0;
+}
+
+static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw,
+ s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+ s32 ret, meas;
+
+ mutex_lock(&data->lock);
+ ret = mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_EXTENDED);
+ if (ret < 0)
+ goto read_unlock;
+
+ ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19,
+ 50000, 800000, false, data);
+ if (ret != 0)
+ goto read_unlock;
+
+ ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw);
+ if (ret < 0)
+ goto read_unlock;
+
+ ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw);
+
+read_unlock:
+ (void) mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_MEDICAL);
+
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
s32 *reg_value)
{
@@ -354,9 +503,23 @@ static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw,
return div64_s64((tmp << 19ULL), 1000LL);
}
+static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw,
+ s16 ambient_old_raw, s16 Ka)
+{
+ s64 VR_IR, kKa, tmp;
+
+ kKa = ((s64)Ka * 1000LL) >> 10ULL;
+ VR_IR = (s64)ambient_old_raw * 1000000LL +
+ kKa * div64_s64((s64)ambient_new_raw * 1000LL,
+ MLX90632_REF_3);
+ tmp = div64_s64(
+ div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12),
+ VR_IR);
+ return div64_s64(tmp << 19ULL, 1000LL);
+}
+
static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
- s32 P_T, s32 P_R, s32 P_G, s32 P_O,
- s16 Gb)
+ s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb)
{
s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;
@@ -374,11 +537,11 @@ static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw,
}
static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
- s64 TAdut, s32 Fa, s32 Fb,
+ s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb,
s32 Ga, s16 Ha, s16 Hb,
u16 emissivity)
{
- s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, Alpha_corr;
+ s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr;
s64 Ha_customer, Hb_customer;
Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
@@ -393,36 +556,66 @@ static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL);
Alpha_corr = div64_s64(Alpha_corr, 1000LL);
ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr);
- TAdut4 = (div64_s64(TAdut, 10000LL) + 27315) *
- (div64_s64(TAdut, 10000LL) + 27315) *
- (div64_s64(TAdut, 10000LL) + 27315) *
- (div64_s64(TAdut, 10000LL) + 27315);
return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4))
- 27315 - Hb_customer) * 10;
}
+static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale)
+{
+ return (div64_s64(TAdut, scale) + 27315) *
+ (div64_s64(TAdut, scale) + 27315) *
+ (div64_s64(TAdut, scale) + 27315) *
+ (div64_s64(TAdut, scale) + 27315);
+}
+
static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb,
s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb,
u16 tmp_emi)
{
- s64 kTA, kTA0, TAdut;
+ s64 kTA, kTA0, TAdut, TAdut4;
s64 temp = 25000;
s8 i;
kTA = (Ea * 1000LL) >> 16LL;
kTA0 = (Eb * 1000LL) >> 8LL;
TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
+ TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
/* Iterations of calculation as described in datasheet */
for (i = 0; i < 5; ++i) {
- temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut,
+ temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4,
Fa, Fb, Ga, Ha, Hb,
tmp_emi);
}
return temp;
}
+static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected,
+ s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga,
+ s16 Ha, s16 Hb, u16 tmp_emi)
+{
+ s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4;
+ s64 temp = 25000;
+ s8 i;
+
+ kTA = (Ea * 1000LL) >> 16LL;
+ kTA0 = (Eb * 1000LL) >> 8LL;
+ TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL;
+ Tr4 = mlx90632_calc_ta4(reflected, 10);
+ TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL);
+ TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000;
+
+ /* Iterations of calculation as described in datasheet */
+ for (i = 0; i < 5; ++i) {
+ temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4,
+ Fa / 2, Fb, Ga, Ha, Hb,
+ tmp_emi);
+ }
+
+ return temp;
+}
+
static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
{
s32 ret;
@@ -470,6 +663,26 @@ static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
if (ret < 0)
return ret;
+ if (object_new_raw > MLX90632_EXTENDED_LIMIT &&
+ data->mtyp == MLX90632_MTYP_EXTENDED) {
+ ret = mlx90632_read_all_channel_extended(data, &object_new_raw,
+ &ambient_new_raw, &ambient_old_raw);
+ if (ret < 0)
+ return ret;
+
+ /* Use extended mode calculations */
+ ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
+ ambient_old_raw, Gb);
+ object = mlx90632_preprocess_temp_obj_extended(object_new_raw,
+ ambient_new_raw,
+ ambient_old_raw, Ka);
+ *val = mlx90632_calc_temp_object_extended(object, ambient,
+ data->object_ambient_temperature,
+ Ea, Eb, Fa, Fb, Ga,
+ Ha, Hb, data->emissivity);
+ return 0;
+ }
+
ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
ambient_old_raw, Gb);
object = mlx90632_preprocess_temp_obj(object_new_raw,
@@ -548,7 +761,9 @@ static int mlx90632_read_raw(struct iio_dev *indio_dev,
*val2 = data->emissivity * 1000;
}
return IIO_VAL_INT_PLUS_MICRO;
-
+ case IIO_CHAN_INFO_CALIBAMBIENT:
+ *val = data->object_ambient_temperature;
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -568,6 +783,9 @@ static int mlx90632_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
data->emissivity = val * 1000 + val2 / 1000;
return 0;
+ case IIO_CHAN_INFO_CALIBAMBIENT:
+ data->object_ambient_temperature = val;
+ return 0;
default:
return -EINVAL;
}
@@ -585,7 +803,7 @@ static const struct iio_chan_spec mlx90632_channels[] = {
.modified = 1,
.channel2 = IIO_MOD_TEMP_OBJECT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
- BIT(IIO_CHAN_INFO_CALIBEMISSIVITY),
+ BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT),
},
};
@@ -643,6 +861,7 @@ static int mlx90632_probe(struct i2c_client *client,
i2c_set_clientdata(client, indio_dev);
mlx90632->client = client;
mlx90632->regmap = regmap;
+ mlx90632->mtyp = MLX90632_MTYP_MEDICAL;
mutex_init(&mlx90632->lock);
indio_dev->name = id->name;
@@ -662,15 +881,20 @@ static int mlx90632_probe(struct i2c_client *client,
dev_err(&client->dev, "read of version failed: %d\n", ret);
return ret;
}
+ read = read & MLX90632_ID_MASK;
if (read == MLX90632_ID_MEDICAL) {
dev_dbg(&client->dev,
"Detected Medical EEPROM calibration %x\n", read);
} else if (read == MLX90632_ID_CONSUMER) {
dev_dbg(&client->dev,
"Detected Consumer EEPROM calibration %x\n", read);
+ } else if (read == MLX90632_ID_EXTENDED) {
+ dev_dbg(&client->dev,
+ "Detected Extended range EEPROM calibration %x\n", read);
+ mlx90632->mtyp = MLX90632_MTYP_EXTENDED;
} else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) {
dev_dbg(&client->dev,
- "Detected Unknown EEPROM calibration %x\n", read);
+ "Detected Unknown EEPROM calibration %x\n", read);
} else {
dev_err(&client->dev,
"Wrong DSP version %x (expected %x)\n",
@@ -679,6 +903,7 @@ static int mlx90632_probe(struct i2c_client *client,
}
mlx90632->emissivity = 1000;
+ mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */
pm_runtime_disable(&client->dev);
ret = pm_runtime_set_active(&client->dev);
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-16 06:28:49 +0300