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Diffstat (limited to 'drivers/iio/temperature/mlx90632.c')
-rw-r--r--drivers/iio/temperature/mlx90632.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
new file mode 100644
index 000000000..2d54d9cac
--- /dev/null
+++ b/drivers/iio/temperature/mlx90632.c
@@ -0,0 +1,757 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor
+ *
+ * Copyright (c) 2017 Melexis <cmo@melexis.com>
+ *
+ * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* Memory sections addresses */
+#define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */
+#define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */
+
+/* EEPROM addresses - used at startup */
+#define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */
+#define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */
+#define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */
+#define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */
+#define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */
+#define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */
+#define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */
+#define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */
+#define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */
+#define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */
+#define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */
+#define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */
+#define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */
+#define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */
+#define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */
+#define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */
+#define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */
+#define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */
+#define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */
+#define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */
+
+#define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */
+#define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */
+
+#define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */
+#define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */
+
+/* Register addresses - volatile */
+#define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */
+
+/* Control register address - volatile */
+#define MLX90632_REG_CONTROL 0x3001 /* Control Register address */
+#define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */
+/* PowerModes statuses */
+#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1)
+#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */
+#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/
+#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */
+#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/
+
+/* Device status register - volatile */
+#define MLX90632_REG_STATUS 0x3fff /* Device status register */
+#define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */
+#define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */
+#define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */
+#define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */
+#define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */
+
+/* RAM_MEAS address-es for each channel */
+#define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num)
+#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)
+
+/* Magic constants */
+#define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */
+#define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */
+#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 */
+
+struct mlx90632_data {
+ struct i2c_client *client;
+ struct mutex lock; /* Multiple reads for single measurement */
+ struct regmap *regmap;
+ u16 emissivity;
+};
+
+static const struct regmap_range mlx90632_volatile_reg_range[] = {
+ regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL),
+ regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS),
+ regmap_reg_range(MLX90632_RAM_1(0),
+ MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_volatile_regs_tbl = {
+ .yes_ranges = mlx90632_volatile_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range),
+};
+
+static const struct regmap_range mlx90632_read_reg_range[] = {
+ regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+ 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_STATUS, MLX90632_REG_STATUS),
+ regmap_reg_range(MLX90632_RAM_1(0),
+ MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_readable_regs_tbl = {
+ .yes_ranges = mlx90632_read_reg_range,
+ .n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range),
+};
+
+static const struct regmap_range mlx90632_no_write_reg_range[] = {
+ regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka),
+ regmap_reg_range(MLX90632_RAM_1(0),
+ MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)),
+};
+
+static const struct regmap_access_table mlx90632_writeable_regs_tbl = {
+ .no_ranges = mlx90632_no_write_reg_range,
+ .n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range),
+};
+
+static const struct regmap_config mlx90632_regmap = {
+ .reg_bits = 16,
+ .val_bits = 16,
+
+ .volatile_table = &mlx90632_volatile_regs_tbl,
+ .rd_table = &mlx90632_readable_regs_tbl,
+ .wr_table = &mlx90632_writeable_regs_tbl,
+
+ .use_single_rw = true,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .val_format_endian = REGMAP_ENDIAN_BIG,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap)
+{
+ return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
+ MLX90632_CFG_PWR_MASK,
+ MLX90632_PWR_STATUS_SLEEP_STEP);
+}
+
+static s32 mlx90632_pwr_continuous(struct regmap *regmap)
+{
+ return regmap_update_bits(regmap, MLX90632_REG_CONTROL,
+ MLX90632_CFG_PWR_MASK,
+ MLX90632_PWR_STATUS_CONTINUOUS);
+}
+
+/**
+ * mlx90632_perform_measurement - Trigger and retrieve current measurement cycle
+ * @*data: pointer to mlx90632_data object containing regmap information
+ *
+ * Perform a measurement and return latest measurement cycle position reported
+ * by sensor. This is a blocking function for 500ms, as that is default sensor
+ * refresh rate.
+ */
+static int mlx90632_perform_measurement(struct mlx90632_data *data)
+{
+ int ret, tries = 100;
+ unsigned int reg_status;
+
+ 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);
+ }
+
+ if (tries < 0) {
+ dev_err(&data->client->dev, "data not ready");
+ return -ETIMEDOUT;
+ }
+
+ return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2;
+}
+
+static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new,
+ uint8_t *channel_old)
+{
+ switch (perform_ret) {
+ case 1:
+ *channel_new = 1;
+ *channel_old = 2;
+ break;
+ case 2:
+ *channel_new = 2;
+ *channel_old = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mlx90632_read_ambient_raw(struct regmap *regmap,
+ s16 *ambient_new_raw, s16 *ambient_old_raw)
+{
+ int ret;
+ unsigned int read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp);
+ if (ret < 0)
+ return ret;
+ *ambient_new_raw = (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp);
+ if (ret < 0)
+ return ret;
+ *ambient_old_raw = (s16)read_tmp;
+
+ return ret;
+}
+
+static int mlx90632_read_object_raw(struct regmap *regmap,
+ int perform_measurement_ret,
+ s16 *object_new_raw, s16 *object_old_raw)
+{
+ int ret;
+ unsigned int read_tmp;
+ s16 read;
+ u8 channel = 0;
+ u8 channel_old = 0;
+
+ ret = mlx90632_channel_new_select(perform_measurement_ret, &channel,
+ &channel_old);
+ if (ret != 0)
+ return ret;
+
+ ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp);
+ if (ret < 0)
+ return ret;
+
+ read = (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp);
+ if (ret < 0)
+ return ret;
+ *object_new_raw = (read + (s16)read_tmp) / 2;
+
+ ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp);
+ if (ret < 0)
+ return ret;
+ read = (s16)read_tmp;
+
+ ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp);
+ if (ret < 0)
+ return ret;
+ *object_old_raw = (read + (s16)read_tmp) / 2;
+
+ return ret;
+}
+
+static int mlx90632_read_all_channel(struct mlx90632_data *data,
+ s16 *ambient_new_raw, s16 *ambient_old_raw,
+ s16 *object_new_raw, s16 *object_old_raw)
+{
+ s32 ret, measurement;
+
+ mutex_lock(&data->lock);
+ measurement = mlx90632_perform_measurement(data);
+ if (measurement < 0) {
+ ret = measurement;
+ goto read_unlock;
+ }
+ ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw,
+ ambient_old_raw);
+ if (ret < 0)
+ goto read_unlock;
+
+ ret = mlx90632_read_object_raw(data->regmap, measurement,
+ object_new_raw, object_old_raw);
+read_unlock:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb,
+ s32 *reg_value)
+{
+ s32 ret;
+ unsigned int read;
+ u32 value;
+
+ ret = regmap_read(regmap, reg_lsb, &read);
+ if (ret < 0)
+ return ret;
+
+ value = read;
+
+ ret = regmap_read(regmap, reg_lsb + 1, &read);
+ if (ret < 0)
+ return ret;
+
+ *reg_value = (read << 16) | (value & 0xffff);
+
+ return 0;
+}
+
+static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw,
+ s16 ambient_old_raw, s16 Gb)
+{
+ s64 VR_Ta, kGb, tmp;
+
+ kGb = ((s64)Gb * 1000LL) >> 10ULL;
+ VR_Ta = (s64)ambient_old_raw * 1000000LL +
+ kGb * div64_s64(((s64)ambient_new_raw * 1000LL),
+ (MLX90632_REF_3));
+ tmp = div64_s64(
+ div64_s64(((s64)ambient_new_raw * 1000000000000LL),
+ (MLX90632_REF_3)), VR_Ta);
+ return div64_s64(tmp << 19ULL, 1000LL);
+}
+
+static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_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 + object_old_raw) / 2)
+ * 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)
+{
+ s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum;
+
+ AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw,
+ Gb);
+ Asub = ((s64)P_T * 10000000000LL) >> 44ULL;
+ Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL);
+ Ablock = Asub * (Bsub * Bsub);
+ Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL;
+ Cblock = ((s64)P_O * 10000000000LL) >> 8ULL;
+
+ sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock;
+
+ return div64_s64(sum, 10000000LL);
+}
+
+static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object,
+ s64 TAdut, s32 Fa, s32 Fb,
+ s32 Ga, s16 Ha, s16 Hb,
+ u16 emissivity)
+{
+ s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, Alpha_corr;
+ s64 Ha_customer, Hb_customer;
+
+ Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL;
+ Hb_customer = ((s64)Hb * 100) >> 10ULL;
+
+ calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL)
+ * 1000LL)) >> 36LL;
+ calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL;
+ Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL)
+ * Ha_customer), 1000LL);
+ Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA));
+ 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 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 temp = 25000;
+ s8 i;
+
+ kTA = (Ea * 1000LL) >> 16LL;
+ kTA0 = (Eb * 1000LL) >> 8LL;
+ TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL;
+
+ /* Iterations of calculation as described in datasheet */
+ for (i = 0; i < 5; ++i) {
+ temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut,
+ Fa, Fb, Ga, Ha, Hb,
+ tmp_emi);
+ }
+ return temp;
+}
+
+static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val)
+{
+ s32 ret;
+ s32 Ea, Eb, Fa, Fb, Ga;
+ unsigned int read_tmp;
+ s16 Ha, Hb, Gb, Ka;
+ s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw;
+ s64 object, ambient;
+
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp);
+ if (ret < 0)
+ return ret;
+ Ha = (s16)read_tmp;
+ ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp);
+ if (ret < 0)
+ return ret;
+ Hb = (s16)read_tmp;
+ ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+ if (ret < 0)
+ return ret;
+ Gb = (s16)read_tmp;
+ ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp);
+ if (ret < 0)
+ return ret;
+ Ka = (s16)read_tmp;
+
+ ret = mlx90632_read_all_channel(data,
+ &ambient_new_raw, &ambient_old_raw,
+ &object_new_raw, &object_old_raw);
+ if (ret < 0)
+ return ret;
+
+ ambient = mlx90632_preprocess_temp_amb(ambient_new_raw,
+ ambient_old_raw, Gb);
+ object = mlx90632_preprocess_temp_obj(object_new_raw,
+ object_old_raw,
+ ambient_new_raw,
+ ambient_old_raw, Ka);
+
+ *val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga,
+ Ha, Hb, data->emissivity);
+ return 0;
+}
+
+static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val)
+{
+ s32 ret;
+ unsigned int read_tmp;
+ s32 PT, PR, PG, PO;
+ s16 Gb;
+ s16 ambient_new_raw, ambient_old_raw;
+
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT);
+ if (ret < 0)
+ return ret;
+ ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp);
+ if (ret < 0)
+ return ret;
+ Gb = (s16)read_tmp;
+
+ ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw,
+ &ambient_old_raw);
+ if (ret < 0)
+ return ret;
+ *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw,
+ PT, PR, PG, PO, Gb);
+ return ret;
+}
+
+static int mlx90632_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct mlx90632_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (channel->channel2) {
+ case IIO_MOD_TEMP_AMBIENT:
+ ret = mlx90632_calc_ambient_dsp105(data, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ case IIO_MOD_TEMP_OBJECT:
+ ret = mlx90632_calc_object_dsp105(data, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_CALIBEMISSIVITY:
+ if (data->emissivity == 1000) {
+ *val = 1;
+ *val2 = 0;
+ } else {
+ *val = 0;
+ *val2 = data->emissivity * 1000;
+ }
+ return IIO_VAL_INT_PLUS_MICRO;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mlx90632_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int val,
+ int val2, long mask)
+{
+ struct mlx90632_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBEMISSIVITY:
+ /* Confirm we are within 0 and 1.0 */
+ if (val < 0 || val2 < 0 || val > 1 ||
+ (val == 1 && val2 != 0))
+ return -EINVAL;
+ data->emissivity = val * 1000 + val2 / 1000;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_chan_spec mlx90632_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .modified = 1,
+ .channel2 = IIO_MOD_TEMP_AMBIENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ },
+ {
+ .type = IIO_TEMP,
+ .modified = 1,
+ .channel2 = IIO_MOD_TEMP_OBJECT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_CALIBEMISSIVITY),
+ },
+};
+
+static const struct iio_info mlx90632_info = {
+ .read_raw = mlx90632_read_raw,
+ .write_raw = mlx90632_write_raw,
+};
+
+static int mlx90632_sleep(struct mlx90632_data *data)
+{
+ regcache_mark_dirty(data->regmap);
+
+ dev_dbg(&data->client->dev, "Requesting sleep");
+ return mlx90632_pwr_set_sleep_step(data->regmap);
+}
+
+static int mlx90632_wakeup(struct mlx90632_data *data)
+{
+ int ret;
+
+ ret = regcache_sync(data->regmap);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "Failed to sync regmap registers: %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(&data->client->dev, "Requesting wake-up\n");
+ return mlx90632_pwr_continuous(data->regmap);
+}
+
+static int mlx90632_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct mlx90632_data *mlx90632;
+ struct regmap *regmap;
+ int ret;
+ unsigned int read;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632));
+ if (!indio_dev) {
+ dev_err(&client->dev, "Failed to allocate device\n");
+ return -ENOMEM;
+ }
+
+ regmap = devm_regmap_init_i2c(client, &mlx90632_regmap);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret);
+ return ret;
+ }
+
+ mlx90632 = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ mlx90632->client = client;
+ mlx90632->regmap = regmap;
+
+ mutex_init(&mlx90632->lock);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &mlx90632_info;
+ indio_dev->channels = mlx90632_channels;
+ indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);
+
+ ret = mlx90632_wakeup(mlx90632);
+ if (ret < 0) {
+ dev_err(&client->dev, "Wakeup failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read);
+ if (ret < 0) {
+ dev_err(&client->dev, "read of version failed: %d\n", ret);
+ return ret;
+ }
+ 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_DSP_MASK) == MLX90632_DSP_VERSION) {
+ dev_dbg(&client->dev,
+ "Detected Unknown EEPROM calibration %x\n", read);
+ } else {
+ dev_err(&client->dev,
+ "Wrong DSP version %x (expected %x)\n",
+ read, MLX90632_DSP_VERSION);
+ return -EPROTONOSUPPORT;
+ }
+
+ mlx90632->emissivity = 1000;
+
+ pm_runtime_disable(&client->dev);
+ ret = pm_runtime_set_active(&client->dev);
+ if (ret < 0) {
+ mlx90632_sleep(mlx90632);
+ return ret;
+ }
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS);
+ pm_runtime_use_autosuspend(&client->dev);
+
+ return iio_device_register(indio_dev);
+}
+
+static int mlx90632_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mlx90632_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+
+ mlx90632_sleep(data);
+
+ return 0;
+}
+
+static const struct i2c_device_id mlx90632_id[] = {
+ { "mlx90632", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90632_id);
+
+static const struct of_device_id mlx90632_of_match[] = {
+ { .compatible = "melexis,mlx90632" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mlx90632_of_match);
+
+static int __maybe_unused mlx90632_pm_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90632_data *data = iio_priv(indio_dev);
+
+ return mlx90632_sleep(data);
+}
+
+static int __maybe_unused mlx90632_pm_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90632_data *data = iio_priv(indio_dev);
+
+ return mlx90632_wakeup(data);
+}
+
+static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend,
+ mlx90632_pm_resume, NULL);
+
+static struct i2c_driver mlx90632_driver = {
+ .driver = {
+ .name = "mlx90632",
+ .of_match_table = mlx90632_of_match,
+ .pm = &mlx90632_pm_ops,
+ },
+ .probe = mlx90632_probe,
+ .remove = mlx90632_remove,
+ .id_table = mlx90632_id,
+};
+module_i2c_driver(mlx90632_driver);
+
+MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
+MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 02:51:13 +0000