diff options
Diffstat (limited to 'drivers/iio/magnetometer/yamaha-yas530.c')
| -rw-r--r-- | drivers/iio/magnetometer/yamaha-yas530.c | 1616 |
1 files changed, 1616 insertions, 0 deletions
diff --git a/drivers/iio/magnetometer/yamaha-yas530.c b/drivers/iio/magnetometer/yamaha-yas530.c new file mode 100644 index 000000000..801c760fe --- /dev/null +++ b/drivers/iio/magnetometer/yamaha-yas530.c @@ -0,0 +1,1616 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for the Yamaha YAS magnetic sensors, often used in Samsung + * mobile phones. While all are not yet handled because of lacking + * hardware, expand this driver to handle the different variants: + * + * YAS530 MS-3E (2011 Samsung Galaxy S Advance) + * YAS532 MS-3R (2011 Samsung Galaxy S4) + * YAS533 MS-3F (Vivo 1633, 1707, V3, Y21L) + * (YAS534 is a magnetic switch, not handled) + * YAS535 MS-6C + * YAS536 MS-3W + * YAS537 MS-3T (2015 Samsung Galaxy S6, Note 5, Galaxy S7) + * YAS539 MS-3S (2018 Samsung Galaxy A7 SM-A750FN) + * + * Code functions found in the MPU3050 YAS530 and YAS532 drivers + * named "inv_compass" in the Tegra Android kernel tree. + * Copyright (C) 2012 InvenSense Corporation + * + * Code functions for YAS537 based on Yamaha Android kernel driver. + * Copyright (c) 2014 Yamaha Corporation + * + * Author: Linus Walleij <linus.walleij@linaro.org> + */ +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/mutex.h> +#include <linux/pm_runtime.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/random.h> +#include <linux/units.h> + +#include <linux/iio/buffer.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include <asm/unaligned.h> + +/* Commonly used registers */ +#define YAS5XX_DEVICE_ID 0x80 +#define YAS5XX_MEASURE_DATA 0xB0 + +/* These registers are used by YAS530, YAS532 and YAS533 */ +#define YAS530_ACTUATE_INIT_COIL 0x81 +#define YAS530_MEASURE 0x82 +#define YAS530_CONFIG 0x83 +#define YAS530_MEASURE_INTERVAL 0x84 +#define YAS530_OFFSET_X 0x85 /* [-31 .. 31] */ +#define YAS530_OFFSET_Y1 0x86 /* [-31 .. 31] */ +#define YAS530_OFFSET_Y2 0x87 /* [-31 .. 31] */ +#define YAS530_TEST1 0x88 +#define YAS530_TEST2 0x89 +#define YAS530_CAL 0x90 + +/* Registers used by YAS537 */ +#define YAS537_MEASURE 0x81 /* Originally YAS537_REG_CMDR */ +#define YAS537_CONFIG 0x82 /* Originally YAS537_REG_CONFR */ +#define YAS537_MEASURE_INTERVAL 0x83 /* Originally YAS537_REG_INTRVLR */ +#define YAS537_OFFSET_X 0x84 /* Originally YAS537_REG_OXR */ +#define YAS537_OFFSET_Y1 0x85 /* Originally YAS537_REG_OY1R */ +#define YAS537_OFFSET_Y2 0x86 /* Originally YAS537_REG_OY2R */ +#define YAS537_AVR 0x87 +#define YAS537_HCK 0x88 +#define YAS537_LCK 0x89 +#define YAS537_SRST 0x90 +#define YAS537_ADCCAL 0x91 +#define YAS537_MTC 0x93 +#define YAS537_OC 0x9E +#define YAS537_TRM 0x9F +#define YAS537_CAL 0xC0 + +/* Bits in the YAS5xx config register */ +#define YAS5XX_CONFIG_INTON BIT(0) /* Interrupt on? */ +#define YAS5XX_CONFIG_INTHACT BIT(1) /* Interrupt active high? */ +#define YAS5XX_CONFIG_CCK_MASK GENMASK(4, 2) +#define YAS5XX_CONFIG_CCK_SHIFT 2 + +/* Bits in the measure command register */ +#define YAS5XX_MEASURE_START BIT(0) +#define YAS5XX_MEASURE_LDTC BIT(1) +#define YAS5XX_MEASURE_FORS BIT(2) +#define YAS5XX_MEASURE_DLYMES BIT(4) +#define YAS5XX_MEASURE_CONT BIT(5) + +/* Bits in the measure data register */ +#define YAS5XX_MEASURE_DATA_BUSY BIT(7) + +#define YAS530_DEVICE_ID 0x01 /* YAS530 (MS-3E) */ +#define YAS530_VERSION_A 0 /* YAS530 (MS-3E A) */ +#define YAS530_VERSION_B 1 /* YAS530B (MS-3E B) */ +#define YAS530_VERSION_A_COEF 380 +#define YAS530_VERSION_B_COEF 550 +#define YAS530_DATA_BITS 12 +#define YAS530_DATA_CENTER BIT(YAS530_DATA_BITS - 1) +#define YAS530_DATA_OVERFLOW (BIT(YAS530_DATA_BITS) - 1) + +#define YAS532_DEVICE_ID 0x02 /* YAS532/YAS533 (MS-3R/F) */ +#define YAS532_VERSION_AB 0 /* YAS532/533 AB (MS-3R/F AB) */ +#define YAS532_VERSION_AC 1 /* YAS532/533 AC (MS-3R/F AC) */ +#define YAS532_VERSION_AB_COEF 1800 +#define YAS532_VERSION_AC_COEF_X 850 +#define YAS532_VERSION_AC_COEF_Y1 750 +#define YAS532_VERSION_AC_COEF_Y2 750 +#define YAS532_DATA_BITS 13 +#define YAS532_DATA_CENTER BIT(YAS532_DATA_BITS - 1) +#define YAS532_DATA_OVERFLOW (BIT(YAS532_DATA_BITS) - 1) + +#define YAS537_DEVICE_ID 0x07 /* YAS537 (MS-3T) */ +#define YAS537_VERSION_0 0 /* Version naming unknown */ +#define YAS537_VERSION_1 1 /* Version naming unknown */ +#define YAS537_MAG_AVERAGE_32_MASK GENMASK(6, 4) +#define YAS537_MEASURE_TIME_WORST_US 1500 +#define YAS537_DEFAULT_SENSOR_DELAY_MS 50 +#define YAS537_MAG_RCOIL_TIME_US 65 +#define YAS537_MTC3_MASK_PREP GENMASK(7, 0) +#define YAS537_MTC3_MASK_GET GENMASK(7, 5) +#define YAS537_MTC3_ADD_BIT BIT(4) +#define YAS537_HCK_MASK_PREP GENMASK(4, 0) +#define YAS537_HCK_MASK_GET GENMASK(7, 4) +#define YAS537_LCK_MASK_PREP GENMASK(4, 0) +#define YAS537_LCK_MASK_GET GENMASK(3, 0) +#define YAS537_OC_MASK_GET GENMASK(5, 0) + +/* Turn off device regulators etc after 5 seconds of inactivity */ +#define YAS5XX_AUTOSUSPEND_DELAY_MS 5000 + +enum chip_ids { + yas530, + yas532, + yas533, + yas537, +}; + +static const int yas530_volatile_reg[] = { + YAS530_ACTUATE_INIT_COIL, + YAS530_MEASURE, +}; + +static const int yas537_volatile_reg[] = { + YAS537_MEASURE, +}; + +struct yas5xx_calibration { + /* Linearization calibration x, y1, y2 */ + s32 r[3]; + u32 f[3]; + /* Temperature compensation calibration */ + s16 Cx, Cy1, Cy2; + /* Misc calibration coefficients */ + s8 a2, a3, a4, a6, a7, a8; + s16 a5, a9; + u8 k; + /* clock divider */ + u8 dck; +}; + +struct yas5xx; + +/** + * struct yas5xx_chip_info - device-specific data and function pointers + * @devid: device ID number + * @product_name: product name of the YAS variant + * @version_names: version letters or namings + * @volatile_reg: device-specific volatile registers + * @volatile_reg_qty: quantity of device-specific volatile registers + * @scaling_val2: scaling value for IIO_CHAN_INFO_SCALE + * @t_ref: number of counts at reference temperature 20 °C + * @min_temp_x10: starting point of temperature counting in 1/10:s degrees Celsius + * @get_measure: function pointer to get a measurement + * @get_calibration_data: function pointer to get calibration data + * @dump_calibration: function pointer to dump calibration for debugging + * @measure_offsets: function pointer to measure the offsets + * @power_on: function pointer to power-on procedure + * + * The "t_ref" value for YAS532/533 is known from the Android driver. + * For YAS530 and YAS537 it was approximately measured. + * + * The temperatures "min_temp_x10" are derived from the temperature resolutions + * given in the data sheets. + */ +struct yas5xx_chip_info { + unsigned int devid; + const char *product_name; + const char *version_names[2]; + const int *volatile_reg; + int volatile_reg_qty; + u32 scaling_val2; + u16 t_ref; + s16 min_temp_x10; + int (*get_measure)(struct yas5xx *yas5xx, s32 *to, s32 *xo, s32 *yo, s32 *zo); + int (*get_calibration_data)(struct yas5xx *yas5xx); + void (*dump_calibration)(struct yas5xx *yas5xx); + int (*measure_offsets)(struct yas5xx *yas5xx); + int (*power_on)(struct yas5xx *yas5xx); +}; + +/** + * struct yas5xx - state container for the YAS5xx driver + * @dev: parent device pointer + * @chip_info: device-specific data and function pointers + * @version: device version + * @calibration: calibration settings from the OTP storage + * @hard_offsets: offsets for each axis measured with initcoil actuated + * @orientation: mounting matrix, flipped axis etc + * @map: regmap to access the YAX5xx registers over I2C + * @regs: the vdd and vddio power regulators + * @reset: optional GPIO line used for handling RESET + * @lock: locks the magnetometer for exclusive use during a measurement (which + * involves several register transactions so the regmap lock is not enough) + * so that measurements get serialized in a first-come-first serve manner + * @scan: naturally aligned measurements + */ +struct yas5xx { + struct device *dev; + const struct yas5xx_chip_info *chip_info; + unsigned int version; + struct yas5xx_calibration calibration; + s8 hard_offsets[3]; + struct iio_mount_matrix orientation; + struct regmap *map; + struct regulator_bulk_data regs[2]; + struct gpio_desc *reset; + struct mutex lock; + /* + * The scanout is 4 x 32 bits in CPU endianness. + * Ensure timestamp is naturally aligned + */ + struct { + s32 channels[4]; + s64 ts __aligned(8); + } scan; +}; + +/* On YAS530 the x, y1 and y2 values are 12 bits */ +static u16 yas530_extract_axis(u8 *data) +{ + u16 val; + + /* + * These are the bits used in a 16bit word: + * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + * x x x x x x x x x x x x + */ + val = get_unaligned_be16(&data[0]); + val = FIELD_GET(GENMASK(14, 3), val); + return val; +} + +/* On YAS532 the x, y1 and y2 values are 13 bits */ +static u16 yas532_extract_axis(u8 *data) +{ + u16 val; + + /* + * These are the bits used in a 16bit word: + * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + * x x x x x x x x x x x x x + */ + val = get_unaligned_be16(&data[0]); + val = FIELD_GET(GENMASK(14, 2), val); + return val; +} + +/** + * yas530_measure() - Make a measure from the hardware + * @yas5xx: The device state + * @t: the raw temperature measurement + * @x: the raw x axis measurement + * @y1: the y1 axis measurement + * @y2: the y2 axis measurement + * @return: 0 on success or error code + * + * Used by YAS530, YAS532 and YAS533. + */ +static int yas530_measure(struct yas5xx *yas5xx, u16 *t, u16 *x, u16 *y1, u16 *y2) +{ + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + unsigned int busy; + u8 data[8]; + int ret; + u16 val; + + mutex_lock(&yas5xx->lock); + ret = regmap_write(yas5xx->map, YAS530_MEASURE, YAS5XX_MEASURE_START); + if (ret < 0) + goto out_unlock; + + /* + * Typical time to measure 1500 us, max 2000 us so wait min 500 us + * and at most 20000 us (one magnitude more than the datsheet max) + * before timeout. + */ + ret = regmap_read_poll_timeout(yas5xx->map, YAS5XX_MEASURE_DATA, busy, + !(busy & YAS5XX_MEASURE_DATA_BUSY), + 500, 20000); + if (ret) { + dev_err(yas5xx->dev, "timeout waiting for measurement\n"); + goto out_unlock; + } + + ret = regmap_bulk_read(yas5xx->map, YAS5XX_MEASURE_DATA, + data, sizeof(data)); + if (ret) + goto out_unlock; + + mutex_unlock(&yas5xx->lock); + + switch (ci->devid) { + case YAS530_DEVICE_ID: + /* + * The t value is 9 bits in big endian format + * These are the bits used in a 16bit word: + * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + * x x x x x x x x x + */ + val = get_unaligned_be16(&data[0]); + val = FIELD_GET(GENMASK(14, 6), val); + *t = val; + *x = yas530_extract_axis(&data[2]); + *y1 = yas530_extract_axis(&data[4]); + *y2 = yas530_extract_axis(&data[6]); + break; + case YAS532_DEVICE_ID: + /* + * The t value is 10 bits in big endian format + * These are the bits used in a 16bit word: + * 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + * x x x x x x x x x x + */ + val = get_unaligned_be16(&data[0]); + val = FIELD_GET(GENMASK(14, 5), val); + *t = val; + *x = yas532_extract_axis(&data[2]); + *y1 = yas532_extract_axis(&data[4]); + *y2 = yas532_extract_axis(&data[6]); + break; + default: + dev_err(yas5xx->dev, "unknown data format\n"); + ret = -EINVAL; + break; + } + + return ret; + +out_unlock: + mutex_unlock(&yas5xx->lock); + return ret; +} + +/** + * yas537_measure() - Make a measure from the hardware + * @yas5xx: The device state + * @t: the raw temperature measurement + * @x: the raw x axis measurement + * @y1: the y1 axis measurement + * @y2: the y2 axis measurement + * @return: 0 on success or error code + */ +static int yas537_measure(struct yas5xx *yas5xx, u16 *t, u16 *x, u16 *y1, u16 *y2) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + unsigned int busy; + u8 data[8]; + u16 xy1y2[3]; + s32 h[3], s[3]; + int i, ret; + + mutex_lock(&yas5xx->lock); + + /* Contrary to YAS530/532, also a "cont" bit is set, meaning unknown */ + ret = regmap_write(yas5xx->map, YAS537_MEASURE, YAS5XX_MEASURE_START | + YAS5XX_MEASURE_CONT); + if (ret < 0) + goto out_unlock; + + /* Use same timeout like YAS530/532 but the bit is in data row 2 */ + ret = regmap_read_poll_timeout(yas5xx->map, YAS5XX_MEASURE_DATA + 2, busy, + !(busy & YAS5XX_MEASURE_DATA_BUSY), + 500, 20000); + if (ret) { + dev_err(yas5xx->dev, "timeout waiting for measurement\n"); + goto out_unlock; + } + + ret = regmap_bulk_read(yas5xx->map, YAS5XX_MEASURE_DATA, + data, sizeof(data)); + if (ret) + goto out_unlock; + + mutex_unlock(&yas5xx->lock); + + *t = get_unaligned_be16(&data[0]); + xy1y2[0] = FIELD_GET(GENMASK(13, 0), get_unaligned_be16(&data[2])); + xy1y2[1] = get_unaligned_be16(&data[4]); + xy1y2[2] = get_unaligned_be16(&data[6]); + + /* The second version of YAS537 needs to include calibration coefficients */ + if (yas5xx->version == YAS537_VERSION_1) { + for (i = 0; i < 3; i++) + s[i] = xy1y2[i] - BIT(13); + h[0] = (c->k * (128 * s[0] + c->a2 * s[1] + c->a3 * s[2])) / BIT(13); + h[1] = (c->k * (c->a4 * s[0] + c->a5 * s[1] + c->a6 * s[2])) / BIT(13); + h[2] = (c->k * (c->a7 * s[0] + c->a8 * s[1] + c->a9 * s[2])) / BIT(13); + for (i = 0; i < 3; i++) { + clamp_val(h[i], -BIT(13), BIT(13) - 1); + xy1y2[i] = h[i] + BIT(13); + } + } + + *x = xy1y2[0]; + *y1 = xy1y2[1]; + *y2 = xy1y2[2]; + + return 0; + +out_unlock: + mutex_unlock(&yas5xx->lock); + return ret; +} + +/* Used by YAS530, YAS532 and YAS533 */ +static s32 yas530_linearize(struct yas5xx *yas5xx, u16 val, int axis) +{ + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + struct yas5xx_calibration *c = &yas5xx->calibration; + static const s32 yas532ac_coef[] = { + YAS532_VERSION_AC_COEF_X, + YAS532_VERSION_AC_COEF_Y1, + YAS532_VERSION_AC_COEF_Y2, + }; + s32 coef; + + /* Select coefficients */ + switch (ci->devid) { + case YAS530_DEVICE_ID: + if (yas5xx->version == YAS530_VERSION_A) + coef = YAS530_VERSION_A_COEF; + else + coef = YAS530_VERSION_B_COEF; + break; + case YAS532_DEVICE_ID: + if (yas5xx->version == YAS532_VERSION_AB) + coef = YAS532_VERSION_AB_COEF; + else + /* Elaborate coefficients */ + coef = yas532ac_coef[axis]; + break; + default: + dev_err(yas5xx->dev, "unknown device type\n"); + return val; + } + /* + * Linearization formula: + * + * x' = x - (3721 + 50 * f) + (xoffset - r) * c + * + * Where f and r are calibration values, c is a per-device + * and sometimes per-axis coefficient. + */ + return val - (3721 + 50 * c->f[axis]) + + (yas5xx->hard_offsets[axis] - c->r[axis]) * coef; +} + +static s32 yas5xx_calc_temperature(struct yas5xx *yas5xx, u16 t) +{ + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + s32 to; + u16 t_ref; + s16 min_temp_x10; + int ref_temp_x10; + + t_ref = ci->t_ref; + min_temp_x10 = ci->min_temp_x10; + ref_temp_x10 = 200; + + to = (min_temp_x10 + ((ref_temp_x10 - min_temp_x10) * t / t_ref)) * 100; + return to; +} + +/** + * yas530_get_measure() - Measure a sample of all axis and process + * @yas5xx: The device state + * @to: Temperature out + * @xo: X axis out + * @yo: Y axis out + * @zo: Z axis out + * @return: 0 on success or error code + * + * Used by YAS530, YAS532 and YAS533. + */ +static int yas530_get_measure(struct yas5xx *yas5xx, s32 *to, s32 *xo, s32 *yo, s32 *zo) +{ + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + struct yas5xx_calibration *c = &yas5xx->calibration; + u16 t_ref, t_comp, t, x, y1, y2; + /* These are signed x, signed y1 etc */ + s32 sx, sy1, sy2, sy, sz; + int ret; + + /* We first get raw data that needs to be translated to [x,y,z] */ + ret = yas530_measure(yas5xx, &t, &x, &y1, &y2); + if (ret) + return ret; + + /* Do some linearization if available */ + sx = yas530_linearize(yas5xx, x, 0); + sy1 = yas530_linearize(yas5xx, y1, 1); + sy2 = yas530_linearize(yas5xx, y2, 2); + + /* + * Set the temperature for compensation (unit: counts): + * YAS532/YAS533 version AC uses the temperature deviation as a + * multiplier. YAS530 and YAS532 version AB use solely the t value. + */ + t_ref = ci->t_ref; + if (ci->devid == YAS532_DEVICE_ID && + yas5xx->version == YAS532_VERSION_AC) { + t_comp = t - t_ref; + } else { + t_comp = t; + } + + /* + * Temperature compensation for x, y1, y2 respectively: + * + * Cx * t_comp + * x' = x - ----------- + * 100 + */ + sx = sx - (c->Cx * t_comp) / 100; + sy1 = sy1 - (c->Cy1 * t_comp) / 100; + sy2 = sy2 - (c->Cy2 * t_comp) / 100; + + /* + * Break y1 and y2 into y and z, y1 and y2 are apparently encoding + * y and z. + */ + sy = sy1 - sy2; + sz = -sy1 - sy2; + + /* Calculate temperature readout */ + *to = yas5xx_calc_temperature(yas5xx, t); + + /* + * Calibrate [x,y,z] with some formulas like this: + * + * 100 * x + a_2 * y + a_3 * z + * x' = k * --------------------------- + * 10 + * + * a_4 * x + a_5 * y + a_6 * z + * y' = k * --------------------------- + * 10 + * + * a_7 * x + a_8 * y + a_9 * z + * z' = k * --------------------------- + * 10 + */ + *xo = c->k * ((100 * sx + c->a2 * sy + c->a3 * sz) / 10); + *yo = c->k * ((c->a4 * sx + c->a5 * sy + c->a6 * sz) / 10); + *zo = c->k * ((c->a7 * sx + c->a8 * sy + c->a9 * sz) / 10); + + return 0; +} + +/** + * yas537_get_measure() - Measure a sample of all axis and process + * @yas5xx: The device state + * @to: Temperature out + * @xo: X axis out + * @yo: Y axis out + * @zo: Z axis out + * @return: 0 on success or error code + */ +static int yas537_get_measure(struct yas5xx *yas5xx, s32 *to, s32 *xo, s32 *yo, s32 *zo) +{ + u16 t, x, y1, y2; + int ret; + + /* We first get raw data that needs to be translated to [x,y,z] */ + ret = yas537_measure(yas5xx, &t, &x, &y1, &y2); + if (ret) + return ret; + + /* Calculate temperature readout */ + *to = yas5xx_calc_temperature(yas5xx, t); + + /* + * Unfortunately, no linearization or temperature compensation formulas + * are known for YAS537. + */ + + /* Calculate x, y, z from x, y1, y2 */ + *xo = (x - BIT(13)) * 300; + *yo = (y1 - y2) * 1732 / 10; + *zo = (-y1 - y2 + BIT(14)) * 300; + + return 0; +} + +static int yas5xx_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, + long mask) +{ + struct yas5xx *yas5xx = iio_priv(indio_dev); + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + s32 t, x, y, z; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + case IIO_CHAN_INFO_RAW: + pm_runtime_get_sync(yas5xx->dev); + ret = ci->get_measure(yas5xx, &t, &x, &y, &z); + pm_runtime_mark_last_busy(yas5xx->dev); + pm_runtime_put_autosuspend(yas5xx->dev); + if (ret) + return ret; + switch (chan->address) { + case 0: + *val = t; + break; + case 1: + *val = x; + break; + case 2: + *val = y; + break; + case 3: + *val = z; + break; + default: + dev_err(yas5xx->dev, "unknown channel\n"); + return -EINVAL; + } + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = 1; + *val2 = ci->scaling_val2; + return IIO_VAL_FRACTIONAL; + default: + /* Unknown request */ + return -EINVAL; + } +} + +static void yas5xx_fill_buffer(struct iio_dev *indio_dev) +{ + struct yas5xx *yas5xx = iio_priv(indio_dev); + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + s32 t, x, y, z; + int ret; + + pm_runtime_get_sync(yas5xx->dev); + ret = ci->get_measure(yas5xx, &t, &x, &y, &z); + pm_runtime_mark_last_busy(yas5xx->dev); + pm_runtime_put_autosuspend(yas5xx->dev); + if (ret) { + dev_err(yas5xx->dev, "error refilling buffer\n"); + return; + } + yas5xx->scan.channels[0] = t; + yas5xx->scan.channels[1] = x; + yas5xx->scan.channels[2] = y; + yas5xx->scan.channels[3] = z; + iio_push_to_buffers_with_timestamp(indio_dev, &yas5xx->scan, + iio_get_time_ns(indio_dev)); +} + +static irqreturn_t yas5xx_handle_trigger(int irq, void *p) +{ + const struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + + yas5xx_fill_buffer(indio_dev); + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + + +static const struct iio_mount_matrix * +yas5xx_get_mount_matrix(const struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct yas5xx *yas5xx = iio_priv(indio_dev); + + return &yas5xx->orientation; +} + +static const struct iio_chan_spec_ext_info yas5xx_ext_info[] = { + IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, yas5xx_get_mount_matrix), + { } +}; + +#define YAS5XX_AXIS_CHANNEL(axis, index) \ + { \ + .type = IIO_MAGN, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .ext_info = yas5xx_ext_info, \ + .address = index, \ + .scan_index = index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 32, \ + .storagebits = 32, \ + .endianness = IIO_CPU, \ + }, \ + } + +static const struct iio_chan_spec yas5xx_channels[] = { + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + .address = 0, + .scan_index = 0, + .scan_type = { + .sign = 's', + .realbits = 32, + .storagebits = 32, + .endianness = IIO_CPU, + }, + }, + YAS5XX_AXIS_CHANNEL(X, 1), + YAS5XX_AXIS_CHANNEL(Y, 2), + YAS5XX_AXIS_CHANNEL(Z, 3), + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +static const unsigned long yas5xx_scan_masks[] = { GENMASK(3, 0), 0 }; + +static const struct iio_info yas5xx_info = { + .read_raw = &yas5xx_read_raw, +}; + +static bool yas5xx_volatile_reg(struct device *dev, unsigned int reg) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct yas5xx *yas5xx = iio_priv(indio_dev); + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + int reg_qty; + int i; + + if (reg >= YAS5XX_MEASURE_DATA && reg < YAS5XX_MEASURE_DATA + 8) + return true; + + /* + * YAS versions share different registers on the same address, + * need to differentiate. + */ + reg_qty = ci->volatile_reg_qty; + for (i = 0; i < reg_qty; i++) { + if (reg == ci->volatile_reg[i]) + return true; + } + + return false; +} + +/* TODO: enable regmap cache, using mark dirty and sync at runtime resume */ +static const struct regmap_config yas5xx_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, + .volatile_reg = yas5xx_volatile_reg, +}; + +/** + * yas530_extract_calibration() - extracts the a2-a9 and k calibration + * @data: the bitfield to use + * @c: the calibration to populate + * + * Used by YAS530, YAS532 and YAS533. + */ +static void yas530_extract_calibration(u8 *data, struct yas5xx_calibration *c) +{ + u64 val = get_unaligned_be64(data); + + /* + * Bitfield layout for the axis calibration data, for factor + * a2 = 2 etc, k = k, c = clock divider + * + * n 7 6 5 4 3 2 1 0 + * 0 [ 2 2 2 2 2 2 3 3 ] bits 63 .. 56 + * 1 [ 3 3 4 4 4 4 4 4 ] bits 55 .. 48 + * 2 [ 5 5 5 5 5 5 6 6 ] bits 47 .. 40 + * 3 [ 6 6 6 6 7 7 7 7 ] bits 39 .. 32 + * 4 [ 7 7 7 8 8 8 8 8 ] bits 31 .. 24 + * 5 [ 8 9 9 9 9 9 9 9 ] bits 23 .. 16 + * 6 [ 9 k k k k k c c ] bits 15 .. 8 + * 7 [ c x x x x x x x ] bits 7 .. 0 + */ + c->a2 = FIELD_GET(GENMASK_ULL(63, 58), val) - 32; + c->a3 = FIELD_GET(GENMASK_ULL(57, 54), val) - 8; + c->a4 = FIELD_GET(GENMASK_ULL(53, 48), val) - 32; + c->a5 = FIELD_GET(GENMASK_ULL(47, 42), val) + 38; + c->a6 = FIELD_GET(GENMASK_ULL(41, 36), val) - 32; + c->a7 = FIELD_GET(GENMASK_ULL(35, 29), val) - 64; + c->a8 = FIELD_GET(GENMASK_ULL(28, 23), val) - 32; + c->a9 = FIELD_GET(GENMASK_ULL(22, 15), val); + c->k = FIELD_GET(GENMASK_ULL(14, 10), val) + 10; + c->dck = FIELD_GET(GENMASK_ULL(9, 7), val); +} + +static int yas530_get_calibration_data(struct yas5xx *yas5xx) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + u8 data[16]; + u32 val; + int ret; + + /* Dummy read, first read is ALWAYS wrong */ + ret = regmap_bulk_read(yas5xx->map, YAS530_CAL, data, sizeof(data)); + if (ret) + return ret; + + /* Actual calibration readout */ + ret = regmap_bulk_read(yas5xx->map, YAS530_CAL, data, sizeof(data)); + if (ret) + return ret; + dev_dbg(yas5xx->dev, "calibration data: %16ph\n", data); + + /* Contribute calibration data to the input pool for kernel entropy */ + add_device_randomness(data, sizeof(data)); + + /* Extract version */ + yas5xx->version = data[15] & GENMASK(1, 0); + + /* Extract the calibration from the bitfield */ + c->Cx = data[0] * 6 - 768; + c->Cy1 = data[1] * 6 - 768; + c->Cy2 = data[2] * 6 - 768; + yas530_extract_calibration(&data[3], c); + + /* + * Extract linearization: + * Linearization layout in the 32 bits at byte 11: + * The r factors are 6 bit values where bit 5 is the sign + * + * n 7 6 5 4 3 2 1 0 + * 0 [ xx xx xx r0 r0 r0 r0 r0 ] bits 31 .. 24 + * 1 [ r0 f0 f0 r1 r1 r1 r1 r1 ] bits 23 .. 16 + * 2 [ r1 f1 f1 r2 r2 r2 r2 r2 ] bits 15 .. 8 + * 3 [ r2 f2 f2 xx xx xx xx xx ] bits 7 .. 0 + */ + val = get_unaligned_be32(&data[11]); + c->f[0] = FIELD_GET(GENMASK(22, 21), val); + c->f[1] = FIELD_GET(GENMASK(14, 13), val); + c->f[2] = FIELD_GET(GENMASK(6, 5), val); + c->r[0] = sign_extend32(FIELD_GET(GENMASK(28, 23), val), 5); + c->r[1] = sign_extend32(FIELD_GET(GENMASK(20, 15), val), 5); + c->r[2] = sign_extend32(FIELD_GET(GENMASK(12, 7), val), 5); + + return 0; +} + +static int yas532_get_calibration_data(struct yas5xx *yas5xx) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + u8 data[14]; + u32 val; + int ret; + + /* Dummy read, first read is ALWAYS wrong */ + ret = regmap_bulk_read(yas5xx->map, YAS530_CAL, data, sizeof(data)); + if (ret) + return ret; + /* Actual calibration readout */ + ret = regmap_bulk_read(yas5xx->map, YAS530_CAL, data, sizeof(data)); + if (ret) + return ret; + dev_dbg(yas5xx->dev, "calibration data: %14ph\n", data); + + /* Sanity check, is this all zeroes? */ + if (!memchr_inv(data, 0x00, 13) && !(data[13] & BIT(7))) + dev_warn(yas5xx->dev, "calibration is blank!\n"); + + /* Contribute calibration data to the input pool for kernel entropy */ + add_device_randomness(data, sizeof(data)); + + /* Only one bit of version info reserved here as far as we know */ + yas5xx->version = data[13] & BIT(0); + + /* Extract calibration from the bitfield */ + c->Cx = data[0] * 10 - 1280; + c->Cy1 = data[1] * 10 - 1280; + c->Cy2 = data[2] * 10 - 1280; + yas530_extract_calibration(&data[3], c); + + /* + * Extract linearization: + * Linearization layout in the 32 bits at byte 10: + * The r factors are 6 bit values where bit 5 is the sign + * + * n 7 6 5 4 3 2 1 0 + * 0 [ xx r0 r0 r0 r0 r0 r0 f0 ] bits 31 .. 24 + * 1 [ f0 r1 r1 r1 r1 r1 r1 f1 ] bits 23 .. 16 + * 2 [ f1 r2 r2 r2 r2 r2 r2 f2 ] bits 15 .. 8 + * 3 [ f2 xx xx xx xx xx xx xx ] bits 7 .. 0 + */ + val = get_unaligned_be32(&data[10]); + c->f[0] = FIELD_GET(GENMASK(24, 23), val); + c->f[1] = FIELD_GET(GENMASK(16, 15), val); + c->f[2] = FIELD_GET(GENMASK(8, 7), val); + c->r[0] = sign_extend32(FIELD_GET(GENMASK(30, 25), val), 5); + c->r[1] = sign_extend32(FIELD_GET(GENMASK(22, 17), val), 5); + c->r[2] = sign_extend32(FIELD_GET(GENMASK(14, 7), val), 5); + + return 0; +} + +static int yas537_get_calibration_data(struct yas5xx *yas5xx) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + u8 data[17]; + u32 val1, val2, val3, val4; + int i, ret; + + /* Writing SRST register */ + ret = regmap_write(yas5xx->map, YAS537_SRST, BIT(1)); + if (ret) + return ret; + + /* Calibration readout, YAS537 needs one readout only */ + ret = regmap_bulk_read(yas5xx->map, YAS537_CAL, data, sizeof(data)); + if (ret) + return ret; + dev_dbg(yas5xx->dev, "calibration data: %17ph\n", data); + + /* Sanity check, is this all zeroes? */ + if (!memchr_inv(data, 0x00, 16) && !FIELD_GET(GENMASK(5, 0), data[16])) + dev_warn(yas5xx->dev, "calibration is blank!\n"); + + /* Contribute calibration data to the input pool for kernel entropy */ + add_device_randomness(data, sizeof(data)); + + /* Extract version information */ + yas5xx->version = FIELD_GET(GENMASK(7, 6), data[16]); + + /* There are two versions of YAS537 behaving differently */ + switch (yas5xx->version) { + case YAS537_VERSION_0: + /* + * The first version simply writes data back into registers: + * + * data[0] YAS537_MTC 0x93 + * data[1] 0x94 + * data[2] 0x95 + * data[3] 0x96 + * data[4] 0x97 + * data[5] 0x98 + * data[6] 0x99 + * data[7] 0x9a + * data[8] 0x9b + * data[9] 0x9c + * data[10] 0x9d + * data[11] YAS537_OC 0x9e + * + * data[12] YAS537_OFFSET_X 0x84 + * data[13] YAS537_OFFSET_Y1 0x85 + * data[14] YAS537_OFFSET_Y2 0x86 + * + * data[15] YAS537_HCK 0x88 + * data[16] YAS537_LCK 0x89 + */ + for (i = 0; i < 12; i++) { + ret = regmap_write(yas5xx->map, YAS537_MTC + i, + data[i]); + if (ret) + return ret; + } + for (i = 0; i < 3; i++) { + ret = regmap_write(yas5xx->map, YAS537_OFFSET_X + i, + data[i + 12]); + if (ret) + return ret; + yas5xx->hard_offsets[i] = data[i + 12]; + } + for (i = 0; i < 2; i++) { + ret = regmap_write(yas5xx->map, YAS537_HCK + i, + data[i + 15]); + if (ret) + return ret; + } + break; + case YAS537_VERSION_1: + /* + * The second version writes some data into registers but also + * extracts calibration coefficients. + * + * Registers being written: + * + * data[0] YAS537_MTC 0x93 + * data[1] YAS537_MTC+1 0x94 + * data[2] YAS537_MTC+2 0x95 + * data[3] YAS537_MTC+3 (partially) 0x96 + * + * data[12] YAS537_OFFSET_X 0x84 + * data[13] YAS537_OFFSET_Y1 0x85 + * data[14] YAS537_OFFSET_Y2 0x86 + * + * data[15] YAS537_HCK (partially) 0x88 + * YAS537_LCK (partially) 0x89 + * data[16] YAS537_OC (partially) 0x9e + */ + for (i = 0; i < 3; i++) { + ret = regmap_write(yas5xx->map, YAS537_MTC + i, + data[i]); + if (ret) + return ret; + } + for (i = 0; i < 3; i++) { + ret = regmap_write(yas5xx->map, YAS537_OFFSET_X + i, + data[i + 12]); + if (ret) + return ret; + yas5xx->hard_offsets[i] = data[i + 12]; + } + /* + * Visualization of partially taken data: + * + * data[3] n 7 6 5 4 3 2 1 0 + * YAS537_MTC+3 x x x 1 0 0 0 0 + * + * data[15] n 7 6 5 4 3 2 1 0 + * YAS537_HCK x x x x 0 + * + * data[15] n 7 6 5 4 3 2 1 0 + * YAS537_LCK x x x x 0 + * + * data[16] n 7 6 5 4 3 2 1 0 + * YAS537_OC x x x x x x + */ + ret = regmap_write(yas5xx->map, YAS537_MTC + 3, + FIELD_PREP(YAS537_MTC3_MASK_PREP, + FIELD_GET(YAS537_MTC3_MASK_GET, data[3])) | + YAS537_MTC3_ADD_BIT); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS537_HCK, + FIELD_PREP(YAS537_HCK_MASK_PREP, + FIELD_GET(YAS537_HCK_MASK_GET, data[15]))); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS537_LCK, + FIELD_PREP(YAS537_LCK_MASK_PREP, + FIELD_GET(YAS537_LCK_MASK_GET, data[15]))); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS537_OC, + FIELD_GET(YAS537_OC_MASK_GET, data[16])); + if (ret) + return ret; + /* + * For data extraction, build some blocks. Four 32-bit blocks + * look appropriate. + * + * n 7 6 5 4 3 2 1 0 + * data[0] 0 [ Cx Cx Cx Cx Cx Cx Cx Cx ] bits 31 .. 24 + * data[1] 1 [ Cx C1 C1 C1 C1 C1 C1 C1 ] bits 23 .. 16 + * data[2] 2 [ C1 C1 C2 C2 C2 C2 C2 C2 ] bits 15 .. 8 + * data[3] 3 [ C2 C2 C2 ] bits 7 .. 0 + * + * n 7 6 5 4 3 2 1 0 + * data[3] 0 [ a2 a2 a2 a2 a2 ] bits 31 .. 24 + * data[4] 1 [ a2 a2 a3 a3 a3 a3 a3 a3 ] bits 23 .. 16 + * data[5] 2 [ a3 a4 a4 a4 a4 a4 a4 a4 ] bits 15 .. 8 + * data[6] 3 [ a4 ] bits 7 .. 0 + * + * n 7 6 5 4 3 2 1 0 + * data[6] 0 [ a5 a5 a5 a5 a5 a5 a5 ] bits 31 .. 24 + * data[7] 1 [ a5 a5 a6 a6 a6 a6 a6 a6 ] bits 23 .. 16 + * data[8] 2 [ a6 a7 a7 a7 a7 a7 a7 a7 ] bits 15 .. 8 + * data[9] 3 [ a7 ] bits 7 .. 0 + * + * n 7 6 5 4 3 2 1 0 + * data[9] 0 [ a8 a8 a8 a8 a8 a8 a8 ] bits 31 .. 24 + * data[10] 1 [ a9 a9 a9 a9 a9 a9 a9 a9 ] bits 23 .. 16 + * data[11] 2 [ a9 k k k k k k k ] bits 15 .. 8 + * data[12] 3 [ ] bits 7 .. 0 + */ + val1 = get_unaligned_be32(&data[0]); + val2 = get_unaligned_be32(&data[3]); + val3 = get_unaligned_be32(&data[6]); + val4 = get_unaligned_be32(&data[9]); + /* Extract calibration coefficients and modify */ + c->Cx = FIELD_GET(GENMASK(31, 23), val1) - 256; + c->Cy1 = FIELD_GET(GENMASK(22, 14), val1) - 256; + c->Cy2 = FIELD_GET(GENMASK(13, 5), val1) - 256; + c->a2 = FIELD_GET(GENMASK(28, 22), val2) - 64; + c->a3 = FIELD_GET(GENMASK(21, 15), val2) - 64; + c->a4 = FIELD_GET(GENMASK(14, 7), val2) - 128; + c->a5 = FIELD_GET(GENMASK(30, 22), val3) - 112; + c->a6 = FIELD_GET(GENMASK(21, 15), val3) - 64; + c->a7 = FIELD_GET(GENMASK(14, 7), val3) - 128; + c->a8 = FIELD_GET(GENMASK(30, 24), val4) - 64; + c->a9 = FIELD_GET(GENMASK(23, 15), val4) - 112; + c->k = FIELD_GET(GENMASK(14, 8), val4); + break; + default: + dev_err(yas5xx->dev, "unknown version of YAS537\n"); + return -EINVAL; + } + + return 0; +} + +/* Used by YAS530, YAS532 and YAS533 */ +static void yas530_dump_calibration(struct yas5xx *yas5xx) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + + dev_dbg(yas5xx->dev, "f[] = [%d, %d, %d]\n", + c->f[0], c->f[1], c->f[2]); + dev_dbg(yas5xx->dev, "r[] = [%d, %d, %d]\n", + c->r[0], c->r[1], c->r[2]); + dev_dbg(yas5xx->dev, "Cx = %d\n", c->Cx); + dev_dbg(yas5xx->dev, "Cy1 = %d\n", c->Cy1); + dev_dbg(yas5xx->dev, "Cy2 = %d\n", c->Cy2); + dev_dbg(yas5xx->dev, "a2 = %d\n", c->a2); + dev_dbg(yas5xx->dev, "a3 = %d\n", c->a3); + dev_dbg(yas5xx->dev, "a4 = %d\n", c->a4); + dev_dbg(yas5xx->dev, "a5 = %d\n", c->a5); + dev_dbg(yas5xx->dev, "a6 = %d\n", c->a6); + dev_dbg(yas5xx->dev, "a7 = %d\n", c->a7); + dev_dbg(yas5xx->dev, "a8 = %d\n", c->a8); + dev_dbg(yas5xx->dev, "a9 = %d\n", c->a9); + dev_dbg(yas5xx->dev, "k = %d\n", c->k); + dev_dbg(yas5xx->dev, "dck = %d\n", c->dck); +} + +static void yas537_dump_calibration(struct yas5xx *yas5xx) +{ + struct yas5xx_calibration *c = &yas5xx->calibration; + + if (yas5xx->version == YAS537_VERSION_1) { + dev_dbg(yas5xx->dev, "Cx = %d\n", c->Cx); + dev_dbg(yas5xx->dev, "Cy1 = %d\n", c->Cy1); + dev_dbg(yas5xx->dev, "Cy2 = %d\n", c->Cy2); + dev_dbg(yas5xx->dev, "a2 = %d\n", c->a2); + dev_dbg(yas5xx->dev, "a3 = %d\n", c->a3); + dev_dbg(yas5xx->dev, "a4 = %d\n", c->a4); + dev_dbg(yas5xx->dev, "a5 = %d\n", c->a5); + dev_dbg(yas5xx->dev, "a6 = %d\n", c->a6); + dev_dbg(yas5xx->dev, "a7 = %d\n", c->a7); + dev_dbg(yas5xx->dev, "a8 = %d\n", c->a8); + dev_dbg(yas5xx->dev, "a9 = %d\n", c->a9); + dev_dbg(yas5xx->dev, "k = %d\n", c->k); + } +} + +/* Used by YAS530, YAS532 and YAS533 */ +static int yas530_set_offsets(struct yas5xx *yas5xx, s8 ox, s8 oy1, s8 oy2) +{ + int ret; + + ret = regmap_write(yas5xx->map, YAS530_OFFSET_X, ox); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS530_OFFSET_Y1, oy1); + if (ret) + return ret; + return regmap_write(yas5xx->map, YAS530_OFFSET_Y2, oy2); +} + +/* Used by YAS530, YAS532 and YAS533 */ +static s8 yas530_adjust_offset(s8 old, int bit, u16 center, u16 measure) +{ + if (measure > center) + return old + BIT(bit); + if (measure < center) + return old - BIT(bit); + return old; +} + +/* Used by YAS530, YAS532 and YAS533 */ +static int yas530_measure_offsets(struct yas5xx *yas5xx) +{ + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + int ret; + u16 center; + u16 t, x, y1, y2; + s8 ox, oy1, oy2; + int i; + + /* Actuate the init coil and measure offsets */ + ret = regmap_write(yas5xx->map, YAS530_ACTUATE_INIT_COIL, 0); + if (ret) + return ret; + + /* When the initcoil is active this should be around the center */ + switch (ci->devid) { + case YAS530_DEVICE_ID: + center = YAS530_DATA_CENTER; + break; + case YAS532_DEVICE_ID: + center = YAS532_DATA_CENTER; + break; + default: + dev_err(yas5xx->dev, "unknown device type\n"); + return -EINVAL; + } + + /* + * We set offsets in the interval +-31 by iterating + * +-16, +-8, +-4, +-2, +-1 adjusting the offsets each + * time, then writing the final offsets into the + * registers. + * + * NOTE: these offsets are NOT in the same unit or magnitude + * as the values for [x, y1, y2]. The value is +/-31 + * but the effect on the raw values is much larger. + * The effect of the offset is to bring the measure + * rougly to the center. + */ + ox = 0; + oy1 = 0; + oy2 = 0; + + for (i = 4; i >= 0; i--) { + ret = yas530_set_offsets(yas5xx, ox, oy1, oy2); + if (ret) + return ret; + + ret = yas530_measure(yas5xx, &t, &x, &y1, &y2); + if (ret) + return ret; + dev_dbg(yas5xx->dev, "measurement %d: x=%d, y1=%d, y2=%d\n", + 5-i, x, y1, y2); + + ox = yas530_adjust_offset(ox, i, center, x); + oy1 = yas530_adjust_offset(oy1, i, center, y1); + oy2 = yas530_adjust_offset(oy2, i, center, y2); + } + + /* Needed for calibration algorithm */ + yas5xx->hard_offsets[0] = ox; + yas5xx->hard_offsets[1] = oy1; + yas5xx->hard_offsets[2] = oy2; + ret = yas530_set_offsets(yas5xx, ox, oy1, oy2); + if (ret) + return ret; + + dev_info(yas5xx->dev, "discovered hard offsets: x=%d, y1=%d, y2=%d\n", + ox, oy1, oy2); + return 0; +} + +/* Used by YAS530, YAS532 and YAS533 */ +static int yas530_power_on(struct yas5xx *yas5xx) +{ + unsigned int val; + int ret; + + /* Zero the test registers */ + ret = regmap_write(yas5xx->map, YAS530_TEST1, 0); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS530_TEST2, 0); + if (ret) + return ret; + + /* Set up for no interrupts, calibrated clock divider */ + val = FIELD_PREP(YAS5XX_CONFIG_CCK_MASK, yas5xx->calibration.dck); + ret = regmap_write(yas5xx->map, YAS530_CONFIG, val); + if (ret) + return ret; + + /* Measure interval 0 (back-to-back?) */ + return regmap_write(yas5xx->map, YAS530_MEASURE_INTERVAL, 0); +} + +static int yas537_power_on(struct yas5xx *yas5xx) +{ + __be16 buf; + int ret; + u8 intrvl; + + /* Writing ADCCAL and TRM registers */ + buf = cpu_to_be16(GENMASK(9, 3)); + ret = regmap_bulk_write(yas5xx->map, YAS537_ADCCAL, &buf, sizeof(buf)); + if (ret) + return ret; + ret = regmap_write(yas5xx->map, YAS537_TRM, GENMASK(7, 0)); + if (ret) + return ret; + + /* The interval value is static in regular operation */ + intrvl = (YAS537_DEFAULT_SENSOR_DELAY_MS * MILLI + - YAS537_MEASURE_TIME_WORST_US) / 4100; + ret = regmap_write(yas5xx->map, YAS537_MEASURE_INTERVAL, intrvl); + if (ret) + return ret; + + /* The average value is also static in regular operation */ + ret = regmap_write(yas5xx->map, YAS537_AVR, YAS537_MAG_AVERAGE_32_MASK); + if (ret) + return ret; + + /* Perform the "rcoil" part but skip the "last_after_rcoil" read */ + ret = regmap_write(yas5xx->map, YAS537_CONFIG, BIT(3)); + if (ret) + return ret; + + /* Wait until the coil has ramped up */ + usleep_range(YAS537_MAG_RCOIL_TIME_US, YAS537_MAG_RCOIL_TIME_US + 100); + + return 0; +} + +static const struct yas5xx_chip_info yas5xx_chip_info_tbl[] = { + [yas530] = { + .devid = YAS530_DEVICE_ID, + .product_name = "YAS530 MS-3E", + .version_names = { "A", "B" }, + .volatile_reg = yas530_volatile_reg, + .volatile_reg_qty = ARRAY_SIZE(yas530_volatile_reg), + .scaling_val2 = 100000000, /* picotesla to Gauss */ + .t_ref = 182, /* counts */ + .min_temp_x10 = -620, /* 1/10:s degrees Celsius */ + .get_measure = yas530_get_measure, + .get_calibration_data = yas530_get_calibration_data, + .dump_calibration = yas530_dump_calibration, + .measure_offsets = yas530_measure_offsets, + .power_on = yas530_power_on, + }, + [yas532] = { + .devid = YAS532_DEVICE_ID, + .product_name = "YAS532 MS-3R", + .version_names = { "AB", "AC" }, + .volatile_reg = yas530_volatile_reg, + .volatile_reg_qty = ARRAY_SIZE(yas530_volatile_reg), + .scaling_val2 = 100000, /* nanotesla to Gauss */ + .t_ref = 390, /* counts */ + .min_temp_x10 = -500, /* 1/10:s degrees Celsius */ + .get_measure = yas530_get_measure, + .get_calibration_data = yas532_get_calibration_data, + .dump_calibration = yas530_dump_calibration, + .measure_offsets = yas530_measure_offsets, + .power_on = yas530_power_on, + }, + [yas533] = { + .devid = YAS532_DEVICE_ID, + .product_name = "YAS533 MS-3F", + .version_names = { "AB", "AC" }, + .volatile_reg = yas530_volatile_reg, + .volatile_reg_qty = ARRAY_SIZE(yas530_volatile_reg), + .scaling_val2 = 100000, /* nanotesla to Gauss */ + .t_ref = 390, /* counts */ + .min_temp_x10 = -500, /* 1/10:s degrees Celsius */ + .get_measure = yas530_get_measure, + .get_calibration_data = yas532_get_calibration_data, + .dump_calibration = yas530_dump_calibration, + .measure_offsets = yas530_measure_offsets, + .power_on = yas530_power_on, + }, + [yas537] = { + .devid = YAS537_DEVICE_ID, + .product_name = "YAS537 MS-3T", + .version_names = { "v0", "v1" }, /* version naming unknown */ + .volatile_reg = yas537_volatile_reg, + .volatile_reg_qty = ARRAY_SIZE(yas537_volatile_reg), + .scaling_val2 = 100000, /* nanotesla to Gauss */ + .t_ref = 8120, /* counts */ + .min_temp_x10 = -3860, /* 1/10:s degrees Celsius */ + .get_measure = yas537_get_measure, + .get_calibration_data = yas537_get_calibration_data, + .dump_calibration = yas537_dump_calibration, + /* .measure_offets is not needed for yas537 */ + .power_on = yas537_power_on, + }, +}; + +static int yas5xx_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct device *dev = &i2c->dev; + struct yas5xx *yas5xx; + const struct yas5xx_chip_info *ci; + int id_check; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*yas5xx)); + if (!indio_dev) + return -ENOMEM; + + yas5xx = iio_priv(indio_dev); + i2c_set_clientdata(i2c, indio_dev); + yas5xx->dev = dev; + mutex_init(&yas5xx->lock); + + ret = iio_read_mount_matrix(dev, &yas5xx->orientation); + if (ret) + return ret; + + yas5xx->regs[0].supply = "vdd"; + yas5xx->regs[1].supply = "iovdd"; + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(yas5xx->regs), + yas5xx->regs); + if (ret) + return dev_err_probe(dev, ret, "cannot get regulators\n"); + + ret = regulator_bulk_enable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); + if (ret) + return dev_err_probe(dev, ret, "cannot enable regulators\n"); + + /* See comment in runtime resume callback */ + usleep_range(31000, 40000); + + /* This will take the device out of reset if need be */ + yas5xx->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(yas5xx->reset)) { + ret = dev_err_probe(dev, PTR_ERR(yas5xx->reset), "failed to get reset line\n"); + goto reg_off; + } + + yas5xx->map = devm_regmap_init_i2c(i2c, &yas5xx_regmap_config); + if (IS_ERR(yas5xx->map)) { + ret = dev_err_probe(dev, PTR_ERR(yas5xx->map), "failed to allocate register map\n"); + goto assert_reset; + } + + ci = device_get_match_data(dev); + if (!ci) + ci = (const struct yas5xx_chip_info *)id->driver_data; + yas5xx->chip_info = ci; + + ret = regmap_read(yas5xx->map, YAS5XX_DEVICE_ID, &id_check); + if (ret) + goto assert_reset; + + if (id_check != ci->devid) { + ret = dev_err_probe(dev, -ENODEV, + "device ID %02x doesn't match %s\n", + id_check, id->name); + goto assert_reset; + } + + ret = ci->get_calibration_data(yas5xx); + if (ret) + goto assert_reset; + + dev_info(dev, "detected %s %s\n", ci->product_name, + ci->version_names[yas5xx->version]); + + ci->dump_calibration(yas5xx); + + ret = ci->power_on(yas5xx); + if (ret) + goto assert_reset; + + if (ci->measure_offsets) { + ret = ci->measure_offsets(yas5xx); + if (ret) + goto assert_reset; + } + + indio_dev->info = &yas5xx_info; + indio_dev->available_scan_masks = yas5xx_scan_masks; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->name = id->name; + indio_dev->channels = yas5xx_channels; + indio_dev->num_channels = ARRAY_SIZE(yas5xx_channels); + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + yas5xx_handle_trigger, + NULL); + if (ret) { + dev_err_probe(dev, ret, "triggered buffer setup failed\n"); + goto assert_reset; + } + + ret = iio_device_register(indio_dev); + if (ret) { + dev_err_probe(dev, ret, "device register failed\n"); + goto cleanup_buffer; + } + + /* Take runtime PM online */ + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + pm_runtime_set_autosuspend_delay(dev, YAS5XX_AUTOSUSPEND_DELAY_MS); + pm_runtime_use_autosuspend(dev); + pm_runtime_put(dev); + + return 0; + +cleanup_buffer: + iio_triggered_buffer_cleanup(indio_dev); +assert_reset: + gpiod_set_value_cansleep(yas5xx->reset, 1); +reg_off: + regulator_bulk_disable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); + + return ret; +} + +static void yas5xx_remove(struct i2c_client *i2c) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(i2c); + struct yas5xx *yas5xx = iio_priv(indio_dev); + struct device *dev = &i2c->dev; + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + /* + * Now we can't get any more reads from the device, which would + * also call pm_runtime* functions and race with our disable + * code. Disable PM runtime in orderly fashion and power down. + */ + pm_runtime_get_sync(dev); + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); + gpiod_set_value_cansleep(yas5xx->reset, 1); + regulator_bulk_disable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); +} + +static int yas5xx_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct yas5xx *yas5xx = iio_priv(indio_dev); + + gpiod_set_value_cansleep(yas5xx->reset, 1); + regulator_bulk_disable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); + + return 0; +} + +static int yas5xx_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct yas5xx *yas5xx = iio_priv(indio_dev); + const struct yas5xx_chip_info *ci = yas5xx->chip_info; + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); + if (ret) { + dev_err(dev, "cannot enable regulators\n"); + return ret; + } + + /* + * The YAS530 datasheet says TVSKW is up to 30 ms, after that 1 ms + * for all voltages to settle. The YAS532 is 10ms then 4ms for the + * I2C to come online. Let's keep it safe and put this at 31ms. + */ + usleep_range(31000, 40000); + gpiod_set_value_cansleep(yas5xx->reset, 0); + + ret = ci->power_on(yas5xx); + if (ret) { + dev_err(dev, "cannot power on\n"); + goto out_reset; + } + + return 0; + +out_reset: + gpiod_set_value_cansleep(yas5xx->reset, 1); + regulator_bulk_disable(ARRAY_SIZE(yas5xx->regs), yas5xx->regs); + + return ret; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(yas5xx_dev_pm_ops, yas5xx_runtime_suspend, + yas5xx_runtime_resume, NULL); + +static const struct i2c_device_id yas5xx_id[] = { + {"yas530", (kernel_ulong_t)&yas5xx_chip_info_tbl[yas530] }, + {"yas532", (kernel_ulong_t)&yas5xx_chip_info_tbl[yas532] }, + {"yas533", (kernel_ulong_t)&yas5xx_chip_info_tbl[yas533] }, + {"yas537", (kernel_ulong_t)&yas5xx_chip_info_tbl[yas537] }, + {} +}; +MODULE_DEVICE_TABLE(i2c, yas5xx_id); + +static const struct of_device_id yas5xx_of_match[] = { + { .compatible = "yamaha,yas530", &yas5xx_chip_info_tbl[yas530] }, + { .compatible = "yamaha,yas532", &yas5xx_chip_info_tbl[yas532] }, + { .compatible = "yamaha,yas533", &yas5xx_chip_info_tbl[yas533] }, + { .compatible = "yamaha,yas537", &yas5xx_chip_info_tbl[yas537] }, + {} +}; +MODULE_DEVICE_TABLE(of, yas5xx_of_match); + +static struct i2c_driver yas5xx_driver = { + .driver = { + .name = "yas5xx", + .of_match_table = yas5xx_of_match, + .pm = pm_ptr(&yas5xx_dev_pm_ops), + }, + .probe = yas5xx_probe, + .remove = yas5xx_remove, + .id_table = yas5xx_id, +}; +module_i2c_driver(yas5xx_driver); + +MODULE_DESCRIPTION("Yamaha YAS53x 3-axis magnetometer driver"); +MODULE_AUTHOR("Linus Walleij"); +MODULE_LICENSE("GPL v2"); |