[PATCH 2/3] iio: accel: kionix-kx022a: Add chip_info structure

From: Mehdi Djait
Date: Thu Mar 16 2023 - 19:49:15 EST

Refactor the kx022a driver implementation to make it more
generic and extensible.
Add the chip_info structure will to the driver's private
data to hold all the device specific infos.
Move the enum, struct and constants definitions to the header
file.

Signed-off-by: Mehdi Djait <mehdi.djait.k@xxxxxxxxx>
---
drivers/iio/accel/kionix-kx022a-i2c.c | 19 +-
drivers/iio/accel/kionix-kx022a-spi.c | 22 +-
drivers/iio/accel/kionix-kx022a.c | 289 ++++++++++++--------------
drivers/iio/accel/kionix-kx022a.h | 128 ++++++++++--
4 files changed, 274 insertions(+), 184 deletions(-)

diff --git a/drivers/iio/accel/kionix-kx022a-i2c.c b/drivers/iio/accel/kionix-kx022a-i2c.c
index e6fd02d931b6..21c4c0ae1a68 100644
--- a/drivers/iio/accel/kionix-kx022a-i2c.c
+++ b/drivers/iio/accel/kionix-kx022a-i2c.c
@@ -15,23 +15,35 @@
static int kx022a_i2c_probe(struct i2c_client *i2c)
{
struct device *dev = &i2c->dev;
+ struct kx022a_chip_info *chip_info;
struct regmap *regmap;
+ const struct i2c_device_id *id = i2c_client_get_device_id(i2c);

if (!i2c->irq) {
dev_err(dev, "No IRQ configured\n");
return -EINVAL;
}

- regmap = devm_regmap_init_i2c(i2c, &kx022a_regmap);
+ chip_info = device_get_match_data(&i2c->dev);
+ if (!chip_info)
+ chip_info = (const struct kx022a_chip_info *) id->driver_data;
+
+ regmap = devm_regmap_init_i2c(i2c, chip_info->regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to initialize Regmap\n");

- return kx022a_probe_internal(dev);
+ return kx022a_probe_internal(dev, chip_info);
}

+static const struct i2c_device_id kx022a_i2c_id[] = {
+ { .name = "kx022a", .driver_data = (kernel_ulong_t)&kx_chip_info[KX022A] },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, kx022a_i2c_id);
+
static const struct of_device_id kx022a_of_match[] = {
- { .compatible = "kionix,kx022a", },
+ { .compatible = "kionix,kx022a", .data = &kx_chip_info[KX022A] },
{ }
};
MODULE_DEVICE_TABLE(of, kx022a_of_match);
@@ -42,6 +54,7 @@ static struct i2c_driver kx022a_i2c_driver = {
.of_match_table = kx022a_of_match,
},
.probe_new = kx022a_i2c_probe,
+ .id_table = kx022a_i2c_id,
};
module_i2c_driver(kx022a_i2c_driver);

diff --git a/drivers/iio/accel/kionix-kx022a-spi.c b/drivers/iio/accel/kionix-kx022a-spi.c
index 9cd047f7b346..ec076af0f261 100644
--- a/drivers/iio/accel/kionix-kx022a-spi.c
+++ b/drivers/iio/accel/kionix-kx022a-spi.c
@@ -15,40 +15,46 @@
static int kx022a_spi_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
+ struct kx022a_chip_info *chip_info;
struct regmap *regmap;
+ const struct spi_device_id *id = spi_get_device_id(spi);

if (!spi->irq) {
dev_err(dev, "No IRQ configured\n");
return -EINVAL;
}

- regmap = devm_regmap_init_spi(spi, &kx022a_regmap);
+ chip_info = device_get_match_data(&spi->dev);
+ if (!chip_info)
+ chip_info = (const struct kx022a_chip_info *) id->driver_data;
+
+ regmap = devm_regmap_init_spi(spi, chip_info->regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to initialize Regmap\n");

- return kx022a_probe_internal(dev);
+ return kx022a_probe_internal(dev, chip_info);
}

-static const struct spi_device_id kx022a_id[] = {
- { "kx022a" },
+static const struct spi_device_id kx022a_spi_id[] = {
+ { .name = "kx022a", .driver_data = (kernel_ulong_t)&kx_chip_info[KX022A] },
{ }
};
-MODULE_DEVICE_TABLE(spi, kx022a_id);
+MODULE_DEVICE_TABLE(spi, kx022a_spi_id);

static const struct of_device_id kx022a_of_match[] = {
- { .compatible = "kionix,kx022a", },
+ { .compatible = "kionix,kx022a", .data = &kx_chip_info[KX022A] },
{ }
};
MODULE_DEVICE_TABLE(of, kx022a_of_match);

static struct spi_driver kx022a_spi_driver = {
.driver = {
- .name = "kx022a-spi",
+ .name = "kx022a-spi",
.of_match_table = kx022a_of_match,
},
.probe = kx022a_spi_probe,
- .id_table = kx022a_id,
+ .id_table = kx022a_spi_id,
};
module_spi_driver(kx022a_spi_driver);

diff --git a/drivers/iio/accel/kionix-kx022a.c b/drivers/iio/accel/kionix-kx022a.c
index 8dac0337c249..27e8642aa8f5 100644
--- a/drivers/iio/accel/kionix-kx022a.c
+++ b/drivers/iio/accel/kionix-kx022a.c
@@ -26,29 +26,7 @@

#include "kionix-kx022a.h"

-/*
- * The KX022A has FIFO which can store 43 samples of HiRes data from 2
- * channels. This equals to 43 (samples) * 3 (channels) * 2 (bytes/sample) to
- * 258 bytes of sample data. The quirk to know is that the amount of bytes in
- * the FIFO is advertised via 8 bit register (max value 255). The thing to note
- * is that full 258 bytes of data is indicated using the max value 255.
- */
-#define KX022A_FIFO_LENGTH 43
-#define KX022A_FIFO_FULL_VALUE 255
-#define KX022A_SOFT_RESET_WAIT_TIME_US (5 * USEC_PER_MSEC)
-#define KX022A_SOFT_RESET_TOTAL_WAIT_TIME_US (500 * USEC_PER_MSEC)
-
-/* 3 axis, 2 bytes of data for each of the axis */
-#define KX022A_FIFO_SAMPLES_SIZE_BYTES 6
-#define KX022A_FIFO_MAX_BYTES \
- (KX022A_FIFO_LENGTH * KX022A_FIFO_SAMPLES_SIZE_BYTES)
-
-enum {
- KX022A_STATE_SAMPLE,
- KX022A_STATE_FIFO,
-};
-
-/* Regmap configs */
+/* kx022a Regmap configs */
static const struct regmap_range kx022a_volatile_ranges[] = {
{
.range_min = KX022A_REG_XHP_L,
@@ -138,7 +116,7 @@ static const struct regmap_access_table kx022a_nir_regs = {
.n_yes_ranges = ARRAY_SIZE(kx022a_noinc_read_ranges),
};

-const struct regmap_config kx022a_regmap = {
+static const struct regmap_config kx022a_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_table = &kx022a_volatile_regs,
@@ -149,39 +127,6 @@ const struct regmap_config kx022a_regmap = {
.max_register = KX022A_MAX_REGISTER,
.cache_type = REGCACHE_RBTREE,
};
-EXPORT_SYMBOL_NS_GPL(kx022a_regmap, IIO_KX022A);
-
-struct kx022a_data {
- struct regmap *regmap;
- struct iio_trigger *trig;
- struct device *dev;
- struct iio_mount_matrix orientation;
- int64_t timestamp, old_timestamp;
-
- int irq;
- int inc_reg;
- int ien_reg;
-
- unsigned int state;
- unsigned int odr_ns;
-
- bool trigger_enabled;
- /*
- * Prevent toggling the sensor stby/active state (PC1 bit) in the
- * middle of a configuration, or when the fifo is enabled. Also,
- * protect the data stored/retrieved from this structure from
- * concurrent accesses.
- */
- struct mutex mutex;
- u8 watermark;
-
- /* 3 x 16bit accel data + timestamp */
- __le16 buffer[8] __aligned(IIO_DMA_MINALIGN);
- struct {
- __le16 channels[3];
- s64 ts __aligned(8);
- } scan;
-};

static const struct iio_mount_matrix *
kx022a_get_mount_matrix(const struct iio_dev *idev,
@@ -192,13 +137,6 @@ kx022a_get_mount_matrix(const struct iio_dev *idev,
return &data->orientation;
}

-enum {
- AXIS_X,
- AXIS_Y,
- AXIS_Z,
- AXIS_MAX
-};
-
static const unsigned long kx022a_scan_masks[] = {
BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z), 0
};
@@ -208,7 +146,7 @@ static const struct iio_chan_spec_ext_info kx022a_ext_info[] = {
{ }
};

-#define KX022A_ACCEL_CHAN(axis, index) \
+#define KX022A_ACCEL_CHAN(axis, index, device) \
{ \
.type = IIO_ACCEL, \
.modified = 1, \
@@ -220,7 +158,7 @@ static const struct iio_chan_spec_ext_info kx022a_ext_info[] = {
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.ext_info = kx022a_ext_info, \
- .address = KX022A_REG_##axis##OUT_L, \
+ .address = device##_REG_##axis##OUT_L, \
.scan_index = index, \
.scan_type = { \
.sign = 's', \
@@ -231,9 +169,9 @@ static const struct iio_chan_spec_ext_info kx022a_ext_info[] = {
}

static const struct iio_chan_spec kx022a_channels[] = {
- KX022A_ACCEL_CHAN(X, 0),
- KX022A_ACCEL_CHAN(Y, 1),
- KX022A_ACCEL_CHAN(Z, 2),
+ KX022A_ACCEL_CHAN(X, 0, KX022A),
+ KX022A_ACCEL_CHAN(Y, 1, KX022A),
+ KX022A_ACCEL_CHAN(Z, 2, KX022A),
IIO_CHAN_SOFT_TIMESTAMP(3),
};

@@ -286,6 +224,34 @@ static const int kx022a_scale_table[][2] = {
{ 4788, 403320 },
};

+const struct kx022a_chip_info kx_chip_info[] = {
+ [KX022A] = {
+ .name = "kx022a",
+ .type = KX022A,
+ .regmap_config = &kx022a_regmap_config,
+ .channels = kx022a_channels,
+ .num_channels = ARRAY_SIZE(kx022a_channels),
+ .fifo_length = KX022A_FIFO_LENGTH,
+ .who = KX022A_REG_WHO,
+ .id = KX022A_ID,
+ .cntl = KX022A_REG_CNTL,
+ .cntl2 = KX022A_REG_CNTL2,
+ .odcntl = KX022A_REG_ODCNTL,
+ .buf_cntl1 = KX022A_REG_BUF_CNTL1,
+ .buf_cntl2 = KX022A_REG_BUF_CNTL2,
+ .buf_clear = KX022A_REG_BUF_CLEAR,
+ .buf_status1 = KX022A_REG_BUF_STATUS_1,
+ .buf_smp_lvl_mask = KX022A_MASK_BUF_SMP_LVL,
+ .buf_read = KX022A_REG_BUF_READ,
+ .inc1 = KX022A_REG_INC1,
+ .inc4 = KX022A_REG_INC4,
+ .inc5 = KX022A_REG_INC5,
+ .inc6 = KX022A_REG_INC6,
+ .xout_l = KX022A_REG_XOUT_L,
+ },
+};
+EXPORT_SYMBOL_NS_GPL(kx_chip_info, IIO_KX022A);
+
static int kx022a_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
@@ -309,19 +275,17 @@ static int kx022a_read_avail(struct iio_dev *indio_dev,
}
}

-#define KX022A_DEFAULT_PERIOD_NS (20 * NSEC_PER_MSEC)
-
static void kx022a_reg2freq(unsigned int val, int *val1, int *val2)
{
- *val1 = kx022a_accel_samp_freq_table[val & KX022A_MASK_ODR][0];
- *val2 = kx022a_accel_samp_freq_table[val & KX022A_MASK_ODR][1];
+ *val1 = kx022a_accel_samp_freq_table[val & KX_MASK_ODR][0];
+ *val2 = kx022a_accel_samp_freq_table[val & KX_MASK_ODR][1];
}

static void kx022a_reg2scale(unsigned int val, unsigned int *val1,
unsigned int *val2)
{
- val &= KX022A_MASK_GSEL;
- val >>= KX022A_GSEL_SHIFT;
+ val &= KX_MASK_GSEL;
+ val >>= KX_GSEL_SHIFT;

*val1 = kx022a_scale_table[val][0];
*val2 = kx022a_scale_table[val][1];
@@ -332,11 +296,11 @@ static int kx022a_turn_on_off_unlocked(struct kx022a_data *data, bool on)
int ret;

if (on)
- ret = regmap_set_bits(data->regmap, KX022A_REG_CNTL,
- KX022A_MASK_PC1);
+ ret = regmap_set_bits(data->regmap, data->chip_info->cntl,
+ KX_MASK_PC1);
else
- ret = regmap_clear_bits(data->regmap, KX022A_REG_CNTL,
- KX022A_MASK_PC1);
+ ret = regmap_clear_bits(data->regmap, data->chip_info->cntl,
+ KX_MASK_PC1);
if (ret)
dev_err(data->dev, "Turn %s fail %d\n", str_on_off(on), ret);

@@ -403,8 +367,8 @@ static int kx022a_write_raw(struct iio_dev *idev,
break;

ret = regmap_update_bits(data->regmap,
- KX022A_REG_ODCNTL,
- KX022A_MASK_ODR, n);
+ data->chip_info->odcntl,
+ KX_MASK_ODR, n);
data->odr_ns = kx022a_odrs[n];
kx022a_turn_on_unlock(data);
break;
@@ -424,9 +388,9 @@ static int kx022a_write_raw(struct iio_dev *idev,
if (ret)
break;

- ret = regmap_update_bits(data->regmap, KX022A_REG_CNTL,
- KX022A_MASK_GSEL,
- n << KX022A_GSEL_SHIFT);
+ ret = regmap_update_bits(data->regmap, data->chip_info->cntl,
+ KX_MASK_GSEL,
+ n << KX_GSEL_SHIFT);
kx022a_turn_on_unlock(data);
break;
default:
@@ -446,8 +410,8 @@ static int kx022a_fifo_set_wmi(struct kx022a_data *data)

threshold = data->watermark;

- return regmap_update_bits(data->regmap, KX022A_REG_BUF_CNTL1,
- KX022A_MASK_WM_TH, threshold);
+ return regmap_update_bits(data->regmap, data->chip_info->buf_cntl1,
+ KX_MASK_WM_TH, threshold);
}

static int kx022a_get_axis(struct kx022a_data *data,
@@ -489,11 +453,11 @@ static int kx022a_read_raw(struct iio_dev *idev,
return ret;

case IIO_CHAN_INFO_SAMP_FREQ:
- ret = regmap_read(data->regmap, KX022A_REG_ODCNTL, &regval);
+ ret = regmap_read(data->regmap, data->chip_info->odcntl, &regval);
if (ret)
return ret;

- if ((regval & KX022A_MASK_ODR) >
+ if ((regval & KX_MASK_ODR) >
ARRAY_SIZE(kx022a_accel_samp_freq_table)) {
dev_err(data->dev, "Invalid ODR\n");
return -EINVAL;
@@ -504,7 +468,7 @@ static int kx022a_read_raw(struct iio_dev *idev,
return IIO_VAL_INT_PLUS_MICRO;

case IIO_CHAN_INFO_SCALE:
- ret = regmap_read(data->regmap, KX022A_REG_CNTL, &regval);
+ ret = regmap_read(data->regmap, data->chip_info->cntl, &regval);
if (ret < 0)
return ret;

@@ -531,8 +495,8 @@ static int kx022a_set_watermark(struct iio_dev *idev, unsigned int val)
{
struct kx022a_data *data = iio_priv(idev);

- if (val > KX022A_FIFO_LENGTH)
- val = KX022A_FIFO_LENGTH;
+ if (val > data->chip_info->fifo_length)
+ val = data->chip_info->fifo_length;

mutex_lock(&data->mutex);
data->watermark = val;
@@ -580,6 +544,37 @@ static const struct iio_dev_attr *kx022a_fifo_attributes[] = {
NULL
};

+static int kx022a_get_fifo_bytes(struct kx022a_data *data)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ __le16 buf_status;
+ int ret, fifo_bytes;
+
+ ret = regmap_bulk_read(data->regmap, data->chip_info->buf_status1, &buf_status, sizeof(buf_status));
+ if (ret) {
+ dev_err(dev, "Error reading buffer status\n");
+ return ret;
+ }
+
+ buf_status &= data->chip_info->buf_smp_lvl_mask;
+ fifo_bytes = le16_to_cpu(buf_status);
+
+ /*
+ * The KX022A has FIFO which can store 43 samples of HiRes data from 2
+ * channels. This equals to 43 (samples) * 3 (channels) * 2 (bytes/sample) to
+ * 258 bytes of sample data. The quirk to know is that the amount of bytes in
+ * the FIFO is advertised via 8 bit register (max value 255). The thing to note
+ * is that full 258 bytes of data is indicated using the max value 255.
+ */
+ if (data->chip_info->type == KX022A && fifo_bytes == KX022A_FIFO_FULL_VALUE)
+ fifo_bytes = KX022A_FIFO_MAX_BYTES;
+
+ if (fifo_bytes % KX_FIFO_SAMPLES_SIZE_BYTES)
+ dev_warn(data->dev, "Bad FIFO alignment. Data may be corrupt\n");
+
+ return fifo_bytes;
+}
+
static int kx022a_drop_fifo_contents(struct kx022a_data *data)
{
/*
@@ -593,35 +588,22 @@ static int kx022a_drop_fifo_contents(struct kx022a_data *data)
*/
data->timestamp = 0;

- return regmap_write(data->regmap, KX022A_REG_BUF_CLEAR, 0x0);
+ return regmap_write(data->regmap, data->chip_info->buf_clear, 0x0);
}

static int __kx022a_fifo_flush(struct iio_dev *idev, unsigned int samples,
bool irq)
{
struct kx022a_data *data = iio_priv(idev);
- struct device *dev = regmap_get_device(data->regmap);
- __le16 buffer[KX022A_FIFO_LENGTH * 3];
+ __le16 buffer[data->chip_info->fifo_length * 3];
uint64_t sample_period;
int count, fifo_bytes;
bool renable = false;
int64_t tstamp;
int ret, i;

- ret = regmap_read(data->regmap, KX022A_REG_BUF_STATUS_1, &fifo_bytes);
- if (ret) {
- dev_err(dev, "Error reading buffer status\n");
- return ret;
- }
-
- /* Let's not overflow if we for some reason get bogus value from i2c */
- if (fifo_bytes == KX022A_FIFO_FULL_VALUE)
- fifo_bytes = KX022A_FIFO_MAX_BYTES;
-
- if (fifo_bytes % KX022A_FIFO_SAMPLES_SIZE_BYTES)
- dev_warn(data->dev, "Bad FIFO alignment. Data may be corrupt\n");
-
- count = fifo_bytes / KX022A_FIFO_SAMPLES_SIZE_BYTES;
+ fifo_bytes = kx022a_get_fifo_bytes(data);
+ count = fifo_bytes / KX_FIFO_SAMPLES_SIZE_BYTES;
if (!count)
return 0;

@@ -679,8 +661,8 @@ static int __kx022a_fifo_flush(struct iio_dev *idev, unsigned int samples,
count = samples;
}

- fifo_bytes = count * KX022A_FIFO_SAMPLES_SIZE_BYTES;
- ret = regmap_noinc_read(data->regmap, KX022A_REG_BUF_READ,
+ fifo_bytes = count * KX_FIFO_SAMPLES_SIZE_BYTES;
+ ret = regmap_noinc_read(data->regmap, data->chip_info->buf_read,
&buffer[0], fifo_bytes);
if (ret)
goto renable_out;
@@ -733,20 +715,18 @@ static const struct iio_info kx022a_info = {
static int kx022a_set_drdy_irq(struct kx022a_data *data, bool en)
{
if (en)
- return regmap_set_bits(data->regmap, KX022A_REG_CNTL,
- KX022A_MASK_DRDY);
+ return regmap_set_bits(data->regmap, data->chip_info->cntl,
+ KX_MASK_DRDY);

- return regmap_clear_bits(data->regmap, KX022A_REG_CNTL,
- KX022A_MASK_DRDY);
+ return regmap_clear_bits(data->regmap, data->chip_info->cntl,
+ KX_MASK_DRDY);
}

static int kx022a_prepare_irq_pin(struct kx022a_data *data)
{
/* Enable IRQ1 pin. Set polarity to active low */
- int mask = KX022A_MASK_IEN | KX022A_MASK_IPOL |
- KX022A_MASK_ITYP;
- int val = KX022A_MASK_IEN | KX022A_IPOL_LOW |
- KX022A_ITYP_LEVEL;
+ int mask = KX_MASK_IEN | KX_MASK_IPOL | KX_MASK_ITYP;
+ int val = KX_MASK_IEN | KX_IPOL_LOW | KX_ITYP_LEVEL;
int ret;

ret = regmap_update_bits(data->regmap, data->inc_reg, mask, val);
@@ -754,7 +734,7 @@ static int kx022a_prepare_irq_pin(struct kx022a_data *data)
return ret;

/* We enable WMI to IRQ pin only at buffer_enable */
- mask = KX022A_MASK_INS2_DRDY;
+ mask = KX_MASK_INS2_DRDY;

return regmap_set_bits(data->regmap, data->ien_reg, mask);
}
@@ -767,16 +747,16 @@ static int kx022a_fifo_disable(struct kx022a_data *data)
if (ret)
return ret;

- ret = regmap_clear_bits(data->regmap, data->ien_reg, KX022A_MASK_WMI);
+ ret = regmap_clear_bits(data->regmap, data->ien_reg, KX_MASK_WMI);
if (ret)
goto unlock_out;

- ret = regmap_clear_bits(data->regmap, KX022A_REG_BUF_CNTL2,
- KX022A_MASK_BUF_EN);
+ ret = regmap_clear_bits(data->regmap, data->chip_info->buf_cntl2,
+ KX_MASK_BUF_EN);
if (ret)
goto unlock_out;

- data->state &= ~KX022A_STATE_FIFO;
+ data->state &= ~KX_STATE_FIFO;

kx022a_drop_fifo_contents(data);

@@ -812,14 +792,14 @@ static int kx022a_fifo_enable(struct kx022a_data *data)
goto unlock_out;

/* Enable buffer */
- ret = regmap_set_bits(data->regmap, KX022A_REG_BUF_CNTL2,
- KX022A_MASK_BUF_EN);
+ ret = regmap_set_bits(data->regmap, data->chip_info->buf_cntl2,
+ KX_MASK_BUF_EN);
if (ret)
goto unlock_out;

- data->state |= KX022A_STATE_FIFO;
+ data->state |= KX_STATE_FIFO;
ret = regmap_set_bits(data->regmap, data->ien_reg,
- KX022A_MASK_WMI);
+ KX_MASK_WMI);
if (ret)
goto unlock_out;

@@ -858,8 +838,8 @@ static irqreturn_t kx022a_trigger_handler(int irq, void *p)
struct kx022a_data *data = iio_priv(idev);
int ret;

- ret = regmap_bulk_read(data->regmap, KX022A_REG_XOUT_L, data->buffer,
- KX022A_FIFO_SAMPLES_SIZE_BYTES);
+ ret = regmap_bulk_read(data->regmap, data->chip_info->xout_l, data->buffer,
+ KX_FIFO_SAMPLES_SIZE_BYTES);
if (ret < 0)
goto err_read;

@@ -879,7 +859,7 @@ static irqreturn_t kx022a_irq_handler(int irq, void *private)
data->old_timestamp = data->timestamp;
data->timestamp = iio_get_time_ns(idev);

- if (data->state & KX022A_STATE_FIFO || data->trigger_enabled)
+ if (data->state & KX_STATE_FIFO || data->trigger_enabled)
return IRQ_WAKE_THREAD;

return IRQ_NONE;
@@ -903,10 +883,10 @@ static irqreturn_t kx022a_irq_thread_handler(int irq, void *private)
ret = IRQ_HANDLED;
}

- if (data->state & KX022A_STATE_FIFO) {
+ if (data->state & KX_STATE_FIFO) {
int ok;

- ok = __kx022a_fifo_flush(idev, KX022A_FIFO_LENGTH, true);
+ ok = __kx022a_fifo_flush(idev, data->chip_info->fifo_length, true);
if (ok > 0)
ret = IRQ_HANDLED;
}
@@ -927,7 +907,7 @@ static int kx022a_trigger_set_state(struct iio_trigger *trig,
if (data->trigger_enabled == state)
goto unlock_out;

- if (data->state & KX022A_STATE_FIFO) {
+ if (data->state & KX_STATE_FIFO) {
dev_warn(data->dev, "Can't set trigger when FIFO enabled\n");
ret = -EBUSY;
goto unlock_out;
@@ -959,7 +939,7 @@ static int kx022a_chip_init(struct kx022a_data *data)
int ret, val;

/* Reset the senor */
- ret = regmap_write(data->regmap, KX022A_REG_CNTL2, KX022A_MASK_SRST);
+ ret = regmap_write(data->regmap, data->chip_info->cntl2, KX_MASK_SRST);
if (ret)
return ret;

@@ -969,25 +949,25 @@ static int kx022a_chip_init(struct kx022a_data *data)
*/
msleep(1);

- ret = regmap_read_poll_timeout(data->regmap, KX022A_REG_CNTL2, val,
- !(val & KX022A_MASK_SRST),
- KX022A_SOFT_RESET_WAIT_TIME_US,
- KX022A_SOFT_RESET_TOTAL_WAIT_TIME_US);
+ ret = regmap_read_poll_timeout(data->regmap, data->chip_info->cntl2, val,
+ !(val & KX_MASK_SRST),
+ KX_SOFT_RESET_WAIT_TIME_US,
+ KX_SOFT_RESET_TOTAL_WAIT_TIME_US);
if (ret) {
dev_err(data->dev, "Sensor reset %s\n",
- val & KX022A_MASK_SRST ? "timeout" : "fail#");
+ val & KX_MASK_SRST ? "timeout" : "fail#");
return ret;
}

- ret = regmap_reinit_cache(data->regmap, &kx022a_regmap);
+ ret = regmap_reinit_cache(data->regmap, data->chip_info->regmap_config);
if (ret) {
dev_err(data->dev, "Failed to reinit reg cache\n");
return ret;
}

/* set data res 16bit */
- ret = regmap_set_bits(data->regmap, KX022A_REG_BUF_CNTL2,
- KX022A_MASK_BRES16);
+ ret = regmap_set_bits(data->regmap, data->chip_info->buf_cntl2,
+ KX_MASK_BRES16);
if (ret) {
dev_err(data->dev, "Failed to set data resolution\n");
return ret;
@@ -996,7 +976,7 @@ static int kx022a_chip_init(struct kx022a_data *data)
return kx022a_prepare_irq_pin(data);
}

-int kx022a_probe_internal(struct device *dev)
+int kx022a_probe_internal(struct device *dev, const struct kx022a_chip_info *chip_info)
{
static const char * const regulator_names[] = {"io-vdd", "vdd"};
struct iio_trigger *indio_trig;
@@ -1023,6 +1003,7 @@ int kx022a_probe_internal(struct device *dev)
return -ENOMEM;

data = iio_priv(idev);
+ data->chip_info = chip_info;

/*
* VDD is the analog and digital domain voltage supply and
@@ -1033,37 +1014,37 @@ int kx022a_probe_internal(struct device *dev)
if (ret && ret != -ENODEV)
return dev_err_probe(dev, ret, "failed to enable regulator\n");

- ret = regmap_read(regmap, KX022A_REG_WHO, &chip_id);
+ ret = regmap_read(regmap, data->chip_info->who, &chip_id);
if (ret)
return dev_err_probe(dev, ret, "Failed to access sensor\n");

- if (chip_id != KX022A_ID) {
+ if (chip_id != data->chip_info->id) {
dev_err(dev, "unsupported device 0x%x\n", chip_id);
return -EINVAL;
}

irq = fwnode_irq_get_byname(fwnode, "INT1");
if (irq > 0) {
- data->inc_reg = KX022A_REG_INC1;
- data->ien_reg = KX022A_REG_INC4;
+ data->inc_reg = data->chip_info->inc1;
+ data->ien_reg = data->chip_info->inc4;
} else {
irq = fwnode_irq_get_byname(fwnode, "INT2");
if (irq <= 0)
return dev_err_probe(dev, irq, "No suitable IRQ\n");

- data->inc_reg = KX022A_REG_INC5;
- data->ien_reg = KX022A_REG_INC6;
+ data->inc_reg = data->chip_info->inc5;
+ data->ien_reg = data->chip_info->inc6;
}

data->regmap = regmap;
data->dev = dev;
data->irq = irq;
- data->odr_ns = KX022A_DEFAULT_PERIOD_NS;
+ data->odr_ns = KX_DEFAULT_PERIOD_NS;
mutex_init(&data->mutex);

- idev->channels = kx022a_channels;
- idev->num_channels = ARRAY_SIZE(kx022a_channels);
- idev->name = "kx022-accel";
+ idev->channels = data->chip_info->channels;
+ idev->num_channels = data->chip_info->num_channels;
+ idev->name = data->chip_info->name;
idev->info = &kx022a_info;
idev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
idev->available_scan_masks = kx022a_scan_masks;
@@ -1112,7 +1093,7 @@ int kx022a_probe_internal(struct device *dev)
* No need to check for NULL. request_threaded_irq() defaults to
* dev_name() should the alloc fail.
*/
- name = devm_kasprintf(data->dev, GFP_KERNEL, "%s-kx022a",
+ name = devm_kasprintf(data->dev, GFP_KERNEL, "%s-accel",
dev_name(data->dev));

ret = devm_request_threaded_irq(data->dev, irq, kx022a_irq_handler,
diff --git a/drivers/iio/accel/kionix-kx022a.h b/drivers/iio/accel/kionix-kx022a.h
index 12424649d438..3bb40e9f5613 100644
--- a/drivers/iio/accel/kionix-kx022a.h
+++ b/drivers/iio/accel/kionix-kx022a.h
@@ -11,24 +11,48 @@
#include <linux/bits.h>
#include <linux/regmap.h>

+#include <linux/iio/iio.h>
+
+/* Common for all supported devices */
+#define KX_FIFO_SAMPLES_SIZE_BYTES 6
+#define KX_SOFT_RESET_WAIT_TIME_US (5 * USEC_PER_MSEC)
+#define KX_SOFT_RESET_TOTAL_WAIT_TIME_US (500 * USEC_PER_MSEC)
+#define KX_DEFAULT_PERIOD_NS (20 * NSEC_PER_MSEC)
+#define KX_MASK_GSEL GENMASK(4, 3)
+#define KX_MASK_ODR GENMASK(3, 0)
+#define KX_MASK_WM_TH GENMASK(6, 0)
+#define KX_GSEL_SHIFT 3
+#define KX_MASK_IEN BIT(5)
+#define KX_MASK_DRDY BIT(5)
+#define KX_MASK_PC1 BIT(7)
+#define KX_MASK_IPOL BIT(4)
+#define KX_IPOL_LOW 0
+#define KX_MASK_ITYP BIT(3)
+#define KX_ITYP_LEVEL 0
+#define KX_MASK_INS2_DRDY BIT(4)
+#define KX_MASK_WMI BIT(5)
+#define KX_MASK_BUF_EN BIT(7)
+#define KX_MASK_SRST BIT(7)
+#define KX_MASK_BRES16 BIT(6)
+
+
#define KX022A_REG_WHO 0x0f
#define KX022A_ID 0xc8

+#define KX022A_FIFO_LENGTH 43
+#define KX022A_FIFO_FULL_VALUE 255
+#define KX022A_FIFO_MAX_BYTES \
+ (KX022A_FIFO_LENGTH * KX_FIFO_SAMPLES_SIZE_BYTES)
+
#define KX022A_REG_CNTL2 0x19
-#define KX022A_MASK_SRST BIT(7)
#define KX022A_REG_CNTL 0x18
-#define KX022A_MASK_PC1 BIT(7)
#define KX022A_MASK_RES BIT(6)
-#define KX022A_MASK_DRDY BIT(5)
-#define KX022A_MASK_GSEL GENMASK(4, 3)
-#define KX022A_GSEL_SHIFT 3
#define KX022A_GSEL_2 0x0
#define KX022A_GSEL_4 BIT(3)
#define KX022A_GSEL_8 BIT(4)
#define KX022A_GSEL_16 GENMASK(4, 3)

#define KX022A_REG_INS2 0x13
-#define KX022A_MASK_INS2_DRDY BIT(4)
#define KX122_MASK_INS2_WMI BIT(5)

#define KX022A_REG_XHP_L 0x0
@@ -45,38 +69,104 @@
#define KX022A_REG_MAN_WAKE 0x2c

#define KX022A_REG_BUF_CNTL1 0x3a
-#define KX022A_MASK_WM_TH GENMASK(6, 0)
#define KX022A_REG_BUF_CNTL2 0x3b
-#define KX022A_MASK_BUF_EN BIT(7)
-#define KX022A_MASK_BRES16 BIT(6)
#define KX022A_REG_BUF_STATUS_1 0x3c
#define KX022A_REG_BUF_STATUS_2 0x3d
+#define KX022A_MASK_BUF_SMP_LVL GENMASK(6, 0)
#define KX022A_REG_BUF_CLEAR 0x3e
#define KX022A_REG_BUF_READ 0x3f
-#define KX022A_MASK_ODR GENMASK(3, 0)
#define KX022A_ODR_SHIFT 3
#define KX022A_FIFO_MAX_WMI_TH 41

#define KX022A_REG_INC1 0x1c
#define KX022A_REG_INC5 0x20
#define KX022A_REG_INC6 0x21
-#define KX022A_MASK_IEN BIT(5)
-#define KX022A_MASK_IPOL BIT(4)
#define KX022A_IPOL_LOW 0
-#define KX022A_IPOL_HIGH KX022A_MASK_IPOL1
-#define KX022A_MASK_ITYP BIT(3)
-#define KX022A_ITYP_PULSE KX022A_MASK_ITYP
-#define KX022A_ITYP_LEVEL 0
+#define KX022A_IPOL_HIGH KX_MASK_IPOL
+#define KX022A_ITYP_PULSE KX_MASK_ITYP

#define KX022A_REG_INC4 0x1f
-#define KX022A_MASK_WMI BIT(5)

#define KX022A_REG_SELF_TEST 0x60
#define KX022A_MAX_REGISTER 0x60

+enum kx022a_device_type {
+ KX022A,
+};
+
+enum {
+ KX_STATE_SAMPLE,
+ KX_STATE_FIFO,
+};
+
+enum {
+ AXIS_X,
+ AXIS_Y,
+ AXIS_Z,
+ AXIS_MAX
+};
+
struct device;

-int kx022a_probe_internal(struct device *dev);
-extern const struct regmap_config kx022a_regmap;
+struct kx022a_chip_info {
+ const char *name;
+ enum kx022a_device_type type;
+ const struct regmap_config *regmap_config;
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
+ unsigned int fifo_length;
+ u8 who;
+ u8 id;
+ u8 cntl;
+ u8 cntl2;
+ u8 odcntl;
+ u8 buf_cntl1;
+ u8 buf_cntl2;
+ u8 buf_clear;
+ u8 buf_status1;
+ u16 buf_smp_lvl_mask;
+ u8 buf_read;
+ u8 inc1;
+ u8 inc4;
+ u8 inc5;
+ u8 inc6;
+ u8 xout_l;
+};
+
+struct kx022a_data {
+ const struct kx022a_chip_info *chip_info;
+ struct regmap *regmap;
+ struct iio_trigger *trig;
+ struct device *dev;
+ struct iio_mount_matrix orientation;
+ int64_t timestamp, old_timestamp;
+
+ int irq;
+ int inc_reg;
+ int ien_reg;
+
+ unsigned int state;
+ unsigned int odr_ns;
+
+ bool trigger_enabled;
+ /*
+ * Prevent toggling the sensor stby/active state (PC1 bit) in the
+ * middle of a configuration, or when the fifo is enabled. Also,
+ * protect the data stored/retrieved from this structure from
+ * concurrent accesses.
+ */
+ struct mutex mutex;
+ u8 watermark;
+
+ /* 3 x 16bit accel data + timestamp */
+ __le16 buffer[8] __aligned(IIO_DMA_MINALIGN);
+ struct {
+ __le16 channels[3];
+ s64 ts __aligned(8);
+ } scan;
+};
+
+int kx022a_probe_internal(struct device *dev, const struct kx022a_chip_info *chip_info);
+extern const struct kx022a_chip_info kx_chip_info[];

#endif
--
2.30.2