[PATCH v2 2/6] iio:pressure:ms5637: introduce hardware differentiation

Alexandre Belloni
2021-01-09T23:14:00Z

Some sensors in the ms58xx family have a different PROM length and a
different number of available resolution. introduce struct ms_tp_hw_data to
handle those differences.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
Changes in v2:
- handle the i2c_device_table

.../iio/common/ms_sensors/ms_sensors_i2c.h | 11 ++++
drivers/iio/pressure/ms5637.c | 50 +++++++++++++++----
2 files changed, 51 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/common/ms_sensors/ms_sensors_i2c.h b/drivers/iio/common/ms_sensors/ms_sensors_i2c.h
index bad09c80e47a..f4a88148c113 100644
--- a/drivers/iio/common/ms_sensors/ms_sensors_i2c.h
+++ b/drivers/iio/common/ms_sensors/ms_sensors_i2c.h
@@ -25,6 +25,16 @@ struct ms_ht_dev {
u8 res_index;
};

+/**
+ * struct ms_hw_data - Temperature/Pressure sensor hardware data
+ * @prom_len: number of words in the PROM
+ * @max_res_index: maximum sensor resolution index
+ */
+struct ms_tp_hw_data {
+ u8 prom_len;
+ u8 max_res_index;
+};
+
/**
* struct ms_tp_dev - Temperature/Pressure sensor device structure
* @client: i2c client
@@ -36,6 +46,7 @@ struct ms_ht_dev {
struct ms_tp_dev {
struct i2c_client *client;
struct mutex lock;
+ const struct ms_tp_hw_data *hw;
u16 prom[MS_SENSORS_TP_PROM_WORDS_NB + 1];
u8 res_index;
};
diff --git a/drivers/iio/pressure/ms5637.c b/drivers/iio/pressure/ms5637.c
index 5b59a4137d32..fdd557ac71a3 100644
--- a/drivers/iio/pressure/ms5637.c
+++ b/drivers/iio/pressure/ms5637.c
@@ -30,6 +30,11 @@

#include "../common/ms_sensors/ms_sensors_i2c.h"

+struct ms_tp_data {
+ const char *name;
+ const struct ms_tp_hw_data *hw;
+};
+
static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
/* String copy of the above const for readability purpose */
static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
@@ -129,6 +134,7 @@ static const struct iio_info ms5637_info = {
static int ms5637_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ const struct ms_tp_data *data;
struct ms_tp_dev *dev_data;
struct iio_dev *indio_dev;
int ret;
@@ -142,17 +148,25 @@ static int ms5637_probe(struct i2c_client *client,
return -EOPNOTSUPP;
}

+ if (id)
+ data = (const struct ms_tp_data *)id->driver_data;
+ else
+ data = device_get_match_data(&client->dev);
+ if (!data)
+ return -EINVAL;
+
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
if (!indio_dev)
return -ENOMEM;

dev_data = iio_priv(indio_dev);
dev_data->client = client;
- dev_data->res_index = 5;
+ dev_data->res_index = data->hw->max_res_index;
+ dev_data->hw = data->hw;
mutex_init(&dev_data->lock);

indio_dev->info = &ms5637_info;
- indio_dev->name = id->name;
+ indio_dev->name = data->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ms5637_channels;
indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
@@ -170,20 +184,36 @@ static int ms5637_probe(struct i2c_client *client,
return devm_iio_device_register(&client->dev, indio_dev);
}

+static const struct ms_tp_hw_data ms5637_hw_data = {
+ .prom_len = 7,
+ .max_res_index = 5
+};
+
+static const struct ms_tp_data ms5637_data = { .name = "ms5637", .hw = &ms5637_hw_data };
+
+static const struct ms_tp_data ms5805_data = { .name = "ms5805", .hw = &ms5637_hw_data };
+
+static const struct ms_tp_data ms5837_data = { .name = "ms5837", .hw = &ms5637_hw_data };
+
+static const struct ms_tp_data ms8607_data = {
+ .name = "ms8607-temppressure",
+ .hw = &ms5637_hw_data,
+};
+
static const struct i2c_device_id ms5637_id[] = {
- {"ms5637", 0},
- {"ms5805", 0},
- {"ms5837", 0},
- {"ms8607-temppressure", 0},
+ {"ms5637", (kernel_ulong_t)&ms5637_data },
+ {"ms5805", (kernel_ulong_t)&ms5805_data },
+ {"ms5837", (kernel_ulong_t)&ms5837_data },
+ {"ms8607-temppressure", (kernel_ulong_t)&ms8607_data },
{}
};
MODULE_DEVICE_TABLE(i2c, ms5637_id);

static const struct of_device_id ms5637_of_match[] = {
- { .compatible = "meas,ms5637", },
- { .compatible = "meas,ms5805", },
- { .compatible = "meas,ms5837", },
- { .compatible = "meas,ms8607-temppressure", },
+ { .compatible = "meas,ms5637", .data = &ms5637_data },
+ { .compatible = "meas,ms5805", .data = &ms5805_data },
+ { .compatible = "meas,ms5837", .data = &ms5837_data },
+ { .compatible = "meas,ms8607-temppressure", .data = &ms8607_data },
{ },
};
MODULE_DEVICE_TABLE(of, ms5637_of_match);
--
2.29.2