[PATCH v2 4/6] iio: pressure: dps310: add per-chip data

[Paulius Zaleckas <paulius.zaleckas@gmail.com>]

Move the coefficient count, the TMP_CFG startup value and the IIO device
name into a per-chip structure, passed through the I2C and ACPI match
data. This prepares for the Zilltek ZTS8032, which has two more
coefficients and a different TMP_CFG layout.

No functional change.

Assisted-by: LLM
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@gmail.com>
---
 drivers/iio/pressure/dps310.c | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
index 3bc690cc8609..0d558edff5ab 100644
--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -61,6 +61,7 @@
 #define DPS310_RESET		0x0c
 #define  DPS310_RESET_MAGIC	0x09
 #define DPS310_COEF_BASE	0x10
+#define DPS310_COEF_LEN		18
 
 /* Make sure sleep time is <= 30ms for usleep_range */
 #define DPS310_POLL_SLEEP_US(t)		min(30000, (t) / 8)
@@ -85,10 +86,23 @@ static const int scale_factors[] = {
 	2088960,
 };
 
+struct dps310_chip_info {
+	const char *name;
+	u8 tmp_cfg;	/* TMP_CFG at startup: sensor the coefficients are for */
+	u8 coef_len;
+};
+
+static const struct dps310_chip_info dps310_chip_info = {
+	.name = "dps310",
+	.tmp_cfg = DPS310_TMP_EXT,
+	.coef_len = DPS310_COEF_LEN,
+};
+
 struct dps310_data {
 	struct i2c_client *client;
 	struct regmap *regmap;
 	struct mutex lock;	/* Lock for sequential HW access functions */
+	const struct dps310_chip_info *info;
 
 	s32 c0, c1;
 	s32 c00, c10, c20, c30, c01, c11, c21;
@@ -148,13 +162,13 @@ static const struct iio_chan_spec dps310_channels[] = {
 static int dps310_get_coefs(struct dps310_data *data)
 {
 	int rc;
-	u8 coef[18];
+	u8 coef[DPS310_COEF_LEN];
 	u32 c0, c1;
 	u32 c00, c10, c20, c30, c01, c11, c21;
 
 	/* Read all sensor calibration coefficients from the COEF registers. */
 	rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef,
-			      sizeof(coef));
+			      data->info->coef_len);
 	if (rc < 0)
 		return rc;
 
@@ -251,10 +265,10 @@ static int dps310_startup(struct dps310_data *data)
 		return rc;
 
 	/*
-	 * Set up external (MEMS) temperature sensor in single sample, one
-	 * measurement per second mode
+	 * Set up the temperature sensor the coefficients are for in single
+	 * sample, one measurement per second mode
 	 */
-	rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT);
+	rc = regmap_write(data->regmap, DPS310_TMP_CFG, data->info->tmp_cfg);
 	if (rc)
 		return rc;
 
@@ -983,7 +997,11 @@ static int dps310_probe(struct i2c_client *client)
 	data->client = client;
 	mutex_init(&data->lock);
 
-	iio->name = DPS310_DEV_NAME;
+	data->info = i2c_get_match_data(client);
+	if (!data->info)
+		return -ENODATA;
+
+	iio->name = data->info->name;
 	iio->channels = dps310_channels;
 	iio->num_channels = ARRAY_SIZE(dps310_channels);
 	iio->info = &dps310_info;
@@ -1022,13 +1040,13 @@ static int dps310_probe(struct i2c_client *client)
 }
 
 static const struct i2c_device_id dps310_id[] = {
-	{ .name = DPS310_DEV_NAME },
+	{ .name = "dps310", .driver_data = (kernel_ulong_t)&dps310_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, dps310_id);
 
 static const struct acpi_device_id dps310_acpi_match[] = {
-	{ "IFX3100" },
+	{ "IFX3100", (kernel_ulong_t)&dps310_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, dps310_acpi_match);
-- 
2.55.0