| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20241017-veml6070-integration-time-v1-4-3507d17d562a@gmail.com>
Date: Thu, 17 Oct 2024 23:39:28 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org,
Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 4/4] iio: light: veml6070: add support for integration time
The integration time of the veml6070 depends on an external resistor
(called Rset in the datasheet) and the value configured in the IT
field of the command register.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
drivers/iio/light/veml6070.c | 109 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 107 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/light/veml6070.c b/drivers/iio/light/veml6070.c
index d11ae00f61f8..87dc3295a656 100644
--- a/drivers/iio/light/veml6070.c
+++ b/drivers/iio/light/veml6070.c
@@ -6,7 +6,7 @@
*
* IIO driver for VEML6070 (7-bit I2C slave addresses 0x38 and 0x39)
*
- * TODO: integration time, ACK signal
+ * TODO: ACK signal
*/
#include <linux/bitfield.h>
@@ -29,15 +29,78 @@
#define VEML6070_COMMAND_RSRVD BIT(1) /* reserved, set to 1 */
#define VEML6070_COMMAND_SD BIT(0) /* shutdown mode when set */
-#define VEML6070_IT_10 0x01 /* integration time 1x */
+#define VEML6070_IT_05 0x00
+#define VEML6070_IT_10 0x01
+#define VEML6070_IT_20 0x02
+#define VEML6070_IT_40 0x03
+
+#define VEML6070_MIN_RSET_KOHM 75
+#define VEML6070_MIN_IT_US 15625 /* Rset = 75 kohm, IT = 1/2 */
struct veml6070_data {
struct i2c_client *client1;
struct i2c_client *client2;
u8 config;
struct mutex lock;
+ u32 it[4][2];
};
+static void veml6070_calc_it(struct device *dev, struct veml6070_data *data)
+{
+ u32 rset, tmp_it;
+ int i, ret;
+
+ ret = device_property_read_u32(dev, "rset-kohms", &rset);
+ if (ret) {
+ dev_warn(dev, "no Rset specified, using default 300 kohms\n");
+ rset = 300;
+ }
+
+ if (rset < 75) {
+ dev_warn(dev, "Rset too low, using minimum = 75 kohms\n");
+ rset = 75;
+ }
+
+ if (rset > 1200) {
+ dev_warn(dev, "Rset too high, using maximum = 1200 kohms\n");
+ rset = 1200;
+ }
+
+ tmp_it = VEML6070_MIN_IT_US * (rset / VEML6070_MIN_RSET_KOHM);
+ for (i = 0; i < ARRAY_SIZE(data->it); i++) {
+ data->it[i][0] = (tmp_it << i) / 1000000;
+ data->it[i][1] = (tmp_it << i) % 1000000;
+ }
+}
+
+static int veml6070_get_it(struct veml6070_data *data, int *val, int *val2)
+{
+ int it_idx = FIELD_GET(VEML6070_COMMAND_IT, data->config);
+
+ *val = data->it[it_idx][0];
+ *val2 = data->it[it_idx][1];
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int veml6070_set_it(struct veml6070_data *data, int val, int val2)
+{
+ int it_idx;
+
+ for (it_idx = 0; it_idx < ARRAY_SIZE(data->it); it_idx++) {
+ if (data->it[it_idx][0] == val && data->it[it_idx][1] == val2)
+ break;
+ }
+
+ if (it_idx >= ARRAY_SIZE(data->it))
+ return -EINVAL;
+
+ data->config = (data->config & ~VEML6070_COMMAND_IT) |
+ FIELD_PREP(VEML6070_COMMAND_IT, it_idx);
+
+ return i2c_smbus_write_byte(data->client1, data->config);
+}
+
static int veml6070_read(struct veml6070_data *data)
{
int ret;
@@ -81,10 +144,14 @@ static const struct iio_chan_spec veml6070_channels[] = {
.modified = 1,
.channel2 = IIO_MOD_LIGHT_UV,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME),
+ .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME),
},
{
.type = IIO_UVINDEX,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME),
+ .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME),
}
};
@@ -127,6 +194,40 @@ static int veml6070_read_raw(struct iio_dev *indio_dev,
else
*val = ret;
return IIO_VAL_INT;
+ case IIO_CHAN_INFO_INT_TIME:
+ return veml6070_get_it(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int veml6070_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ struct veml6070_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ *vals = (int *)data->it;
+ *length = 2 * ARRAY_SIZE(data->it);
+ *type = IIO_VAL_INT_PLUS_MICRO;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int veml6070_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct veml6070_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ return veml6070_set_it(data, val, val2);
default:
return -EINVAL;
}
@@ -134,6 +235,8 @@ static int veml6070_read_raw(struct iio_dev *indio_dev,
static const struct iio_info veml6070_info = {
.read_raw = veml6070_read_raw,
+ .read_avail = veml6070_read_avail,
+ .write_raw = veml6070_write_raw,
};
static void veml6070_i2c_unreg(void *p)
@@ -164,6 +267,8 @@ static int veml6070_probe(struct i2c_client *client)
indio_dev->name = VEML6070_DRV_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
+ veml6070_calc_it(&client->dev, data);
+
ret = devm_regulator_get_enable(&client->dev, "vdd");
if (ret < 0)
return ret;
--
2.43.0
Powered by blists - more mailing lists