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Date: Thu, 3 Feb 2022 13:45:06 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Nuno Sá <nuno.sa@...log.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH v1 2/2] iio: temperature: ltc2983: Make use of device properties
Convert the module to be property provider agnostic and allow
it to be used on non-OF platforms.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/iio/temperature/ltc2983.c | 211 +++++++++++++++---------------
1 file changed, 105 insertions(+), 106 deletions(-)
diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index d272c303c1b0..a2fcea7d9d90 100644
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -12,11 +12,15 @@
#include <linux/iio/iio.h>
#include <linux/interrupt.h>
#include <linux/list.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
-#include <linux/of_gpio.h>
+#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
/* register map */
#define LTC2983_STATUS_REG 0x0000
#define LTC2983_TEMP_RES_START_REG 0x0010
@@ -219,7 +223,7 @@ struct ltc2983_sensor {
struct ltc2983_custom_sensor {
/* raw table sensor data */
- u8 *table;
+ void *table;
size_t size;
/* address offset */
s8 offset;
@@ -377,25 +381,25 @@ static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st,
return regmap_bulk_write(st->regmap, reg, custom->table, custom->size);
}
-static struct ltc2983_custom_sensor *__ltc2983_custom_sensor_new(
- struct ltc2983_data *st,
- const struct device_node *np,
- const char *propname,
- const bool is_steinhart,
- const u32 resolution,
- const bool has_signed)
+static struct ltc2983_custom_sensor *
+__ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle *fn,
+ const char *propname, const bool is_steinhart,
+ const u32 resolution, const bool has_signed)
{
struct ltc2983_custom_sensor *new_custom;
- u8 index, n_entries, tbl = 0;
struct device *dev = &st->spi->dev;
/*
* For custom steinhart, the full u32 is taken. For all the others
* the MSB is discarded.
*/
const u8 n_size = is_steinhart ? 4 : 3;
- const u8 e_size = is_steinhart ? sizeof(u32) : sizeof(u64);
+ u8 index, n_entries;
+ int ret;
- n_entries = of_property_count_elems_of_size(np, propname, e_size);
+ if (is_steinhart)
+ n_entries = fwnode_property_count_u32(fn, propname);
+ else
+ n_entries = fwnode_property_count_u64(fn, propname);
/* n_entries must be an even number */
if (!n_entries || (n_entries % 2) != 0) {
dev_err(dev, "Number of entries either 0 or not even\n");
@@ -415,29 +419,39 @@ static struct ltc2983_custom_sensor *__ltc2983_custom_sensor_new(
}
/* Check space on the table. */
if (st->custom_table_size + new_custom->size >
- (LTC2983_CUST_SENS_TBL_END_REG -
- LTC2983_CUST_SENS_TBL_START_REG) + 1) {
+ (LTC2983_CUST_SENS_TBL_END_REG - LTC2983_CUST_SENS_TBL_START_REG) + 1) {
dev_err(dev, "No space left(%d) for new custom sensor(%zu)",
st->custom_table_size, new_custom->size);
return ERR_PTR(-EINVAL);
}
/* allocate the table */
- new_custom->table = devm_kzalloc(dev, new_custom->size, GFP_KERNEL);
+ if (is_steinhart)
+ new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u32), GFP_KERNEL);
+ else
+ new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u64), GFP_KERNEL);
if (!new_custom->table)
return ERR_PTR(-ENOMEM);
- for (index = 0; index < n_entries; index++) {
- u64 temp = 0, j;
- /*
- * Steinhart sensors are configured with raw values in the
- * devicetree. For the other sensors we must convert the
- * value to raw. The odd index's correspond to temperarures
- * and always have 1/1024 of resolution. Temperatures also
- * come in kelvin, so signed values is not possible
- */
- if (!is_steinhart) {
- of_property_read_u64_index(np, propname, index, &temp);
+ if (is_steinhart)
+ ret = fwnode_property_read_u32_array(fn, propname, new_custom->table, n_entries);
+ else
+ ret = fwnode_property_read_u64_array(fn, propname, new_custom->table, n_entries);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ /*
+ * Steinhart sensors are configured with raw values in the device tree.
+ * For the other sensors we must convert the value to raw. The odd
+ * index's correspond to temperatures and always have 1/1024 of
+ * resolution. Temperatures also come in Kelvin, so signed values is
+ * not possible.
+ */
+ if (is_steinhart) {
+ cpu_to_be32_array(new_custom->table, new_custom->table, n_entries);
+ } else {
+ for (index = 0; index < n_entries; index++) {
+ u64 temp = ((u64 *)new_custom->table)[index];
if ((index % 2) != 0)
temp = __convert_to_raw(temp, 1024);
@@ -445,16 +459,9 @@ static struct ltc2983_custom_sensor *__ltc2983_custom_sensor_new(
temp = __convert_to_raw_sign(temp, resolution);
else
temp = __convert_to_raw(temp, resolution);
- } else {
- u32 t32;
- of_property_read_u32_index(np, propname, index, &t32);
- temp = t32;
+ put_unaligned_be24(temp, new_custom->table + index * 3);
}
-
- for (j = 0; j < n_size; j++)
- new_custom->table[tbl++] =
- temp >> (8 * (n_size - j - 1));
}
new_custom->is_steinhart = is_steinhart;
@@ -597,13 +604,12 @@ static int ltc2983_adc_assign_chan(struct ltc2983_data *st,
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
-static struct ltc2983_sensor *ltc2983_thermocouple_new(
- const struct device_node *child,
- struct ltc2983_data *st,
- const struct ltc2983_sensor *sensor)
+static struct ltc2983_sensor *
+ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermocouple *thermo;
- struct device_node *phandle;
+ struct fwnode_handle *ref;
u32 oc_current;
int ret;
@@ -611,11 +617,10 @@ static struct ltc2983_sensor *ltc2983_thermocouple_new(
if (!thermo)
return ERR_PTR(-ENOMEM);
- if (of_property_read_bool(child, "adi,single-ended"))
+ if (fwnode_property_read_bool(child, "adi,single-ended"))
thermo->sensor_config = LTC2983_THERMOCOUPLE_SGL(1);
- ret = of_property_read_u32(child, "adi,sensor-oc-current-microamp",
- &oc_current);
+ ret = fwnode_property_read_u32(child, "adi,sensor-oc-current-microamp", &oc_current);
if (!ret) {
switch (oc_current) {
case 10:
@@ -651,19 +656,18 @@ static struct ltc2983_sensor *ltc2983_thermocouple_new(
return ERR_PTR(-EINVAL);
}
- phandle = of_parse_phandle(child, "adi,cold-junction-handle", 0);
- if (phandle) {
+ ref = fwnode_find_reference(child, "adi,cold-junction-handle", 0);
+ if (ref) {
int ret;
- ret = of_property_read_u32(phandle, "reg",
- &thermo->cold_junction_chan);
+ ret = fwnode_property_read_u32(ref, "reg", &thermo->cold_junction_chan);
if (ret) {
/*
* This would be catched later but we can just return
* the error right away.
*/
dev_err(&st->spi->dev, "Property reg must be given\n");
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_PTR(-EINVAL);
}
}
@@ -676,7 +680,7 @@ static struct ltc2983_sensor *ltc2983_thermocouple_new(
propname, false,
16384, true);
if (IS_ERR(thermo->custom)) {
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_CAST(thermo->custom);
}
}
@@ -685,37 +689,37 @@ static struct ltc2983_sensor *ltc2983_thermocouple_new(
thermo->sensor.fault_handler = ltc2983_thermocouple_fault_handler;
thermo->sensor.assign_chan = ltc2983_thermocouple_assign_chan;
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return &thermo->sensor;
}
-static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
- struct ltc2983_data *st,
- const struct ltc2983_sensor *sensor)
+static struct ltc2983_sensor *
+ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
{
struct ltc2983_rtd *rtd;
int ret = 0;
struct device *dev = &st->spi->dev;
- struct device_node *phandle;
+ struct fwnode_handle *ref;
u32 excitation_current = 0, n_wires = 0;
rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
if (!rtd)
return ERR_PTR(-ENOMEM);
- phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
- if (!phandle) {
+ ref = fwnode_find_reference(child, "adi,rsense-handle", 0);
+ if (!ref) {
dev_err(dev, "Property adi,rsense-handle missing or invalid");
return ERR_PTR(-EINVAL);
}
- ret = of_property_read_u32(phandle, "reg", &rtd->r_sense_chan);
+ ret = fwnode_property_read_u32(ref, "reg", &rtd->r_sense_chan);
if (ret) {
dev_err(dev, "Property reg must be given\n");
goto fail;
}
- ret = of_property_read_u32(child, "adi,number-of-wires", &n_wires);
+ ret = fwnode_property_read_u32(child, "adi,number-of-wires", &n_wires);
if (!ret) {
switch (n_wires) {
case 2:
@@ -738,9 +742,9 @@ static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
}
}
- if (of_property_read_bool(child, "adi,rsense-share")) {
+ if (fwnode_property_read_bool(child, "adi,rsense-share")) {
/* Current rotation is only available with rsense sharing */
- if (of_property_read_bool(child, "adi,current-rotate")) {
+ if (fwnode_property_read_bool(child, "adi,current-rotate")) {
if (n_wires == 2 || n_wires == 3) {
dev_err(dev,
"Rotation not allowed for 2/3 Wire RTDs");
@@ -803,7 +807,7 @@ static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
"adi,custom-rtd",
false, 2048, false);
if (IS_ERR(rtd->custom)) {
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_CAST(rtd->custom);
}
}
@@ -812,8 +816,8 @@ static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
rtd->sensor.fault_handler = ltc2983_common_fault_handler;
rtd->sensor.assign_chan = ltc2983_rtd_assign_chan;
- ret = of_property_read_u32(child, "adi,excitation-current-microamp",
- &excitation_current);
+ ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
+ &excitation_current);
if (ret) {
/* default to 5uA */
rtd->excitation_current = 1;
@@ -852,23 +856,22 @@ static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
}
}
- of_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
+ fwnode_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return &rtd->sensor;
fail:
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_PTR(ret);
}
-static struct ltc2983_sensor *ltc2983_thermistor_new(
- const struct device_node *child,
- struct ltc2983_data *st,
- const struct ltc2983_sensor *sensor)
+static struct ltc2983_sensor *
+ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermistor *thermistor;
struct device *dev = &st->spi->dev;
- struct device_node *phandle;
+ struct fwnode_handle *ref;
u32 excitation_current = 0;
int ret = 0;
@@ -876,23 +879,23 @@ static struct ltc2983_sensor *ltc2983_thermistor_new(
if (!thermistor)
return ERR_PTR(-ENOMEM);
- phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
- if (!phandle) {
+ ref = fwnode_find_reference(child, "adi,rsense-handle", 0);
+ if (!ref) {
dev_err(dev, "Property adi,rsense-handle missing or invalid");
return ERR_PTR(-EINVAL);
}
- ret = of_property_read_u32(phandle, "reg", &thermistor->r_sense_chan);
+ ret = fwnode_property_read_u32(ref, "reg", &thermistor->r_sense_chan);
if (ret) {
dev_err(dev, "rsense channel must be configured...\n");
goto fail;
}
- if (of_property_read_bool(child, "adi,single-ended")) {
+ if (fwnode_property_read_bool(child, "adi,single-ended")) {
thermistor->sensor_config = LTC2983_THERMISTOR_SGL(1);
- } else if (of_property_read_bool(child, "adi,rsense-share")) {
+ } else if (fwnode_property_read_bool(child, "adi,rsense-share")) {
/* rotation is only possible if sharing rsense */
- if (of_property_read_bool(child, "adi,current-rotate"))
+ if (fwnode_property_read_bool(child, "adi,current-rotate"))
thermistor->sensor_config =
LTC2983_THERMISTOR_C_ROTATE(1);
else
@@ -926,7 +929,7 @@ static struct ltc2983_sensor *ltc2983_thermistor_new(
steinhart,
64, false);
if (IS_ERR(thermistor->custom)) {
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_CAST(thermistor->custom);
}
}
@@ -934,8 +937,8 @@ static struct ltc2983_sensor *ltc2983_thermistor_new(
thermistor->sensor.fault_handler = ltc2983_common_fault_handler;
thermistor->sensor.assign_chan = ltc2983_thermistor_assign_chan;
- ret = of_property_read_u32(child, "adi,excitation-current-nanoamp",
- &excitation_current);
+ ret = fwnode_property_read_u32(child, "adi,excitation-current-nanoamp",
+ &excitation_current);
if (ret) {
/* Auto range is not allowed for custom sensors */
if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
@@ -999,17 +1002,16 @@ static struct ltc2983_sensor *ltc2983_thermistor_new(
}
}
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return &thermistor->sensor;
fail:
- of_node_put(phandle);
+ fwnode_handle_put(ref);
return ERR_PTR(ret);
}
-static struct ltc2983_sensor *ltc2983_diode_new(
- const struct device_node *child,
- const struct ltc2983_data *st,
- const struct ltc2983_sensor *sensor)
+static struct ltc2983_sensor *
+ltc2983_diode_new(const struct fwnode_handle *child, const struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
{
struct ltc2983_diode *diode;
u32 temp = 0, excitation_current = 0;
@@ -1019,13 +1021,13 @@ static struct ltc2983_sensor *ltc2983_diode_new(
if (!diode)
return ERR_PTR(-ENOMEM);
- if (of_property_read_bool(child, "adi,single-ended"))
+ if (fwnode_property_read_bool(child, "adi,single-ended"))
diode->sensor_config = LTC2983_DIODE_SGL(1);
- if (of_property_read_bool(child, "adi,three-conversion-cycles"))
+ if (fwnode_property_read_bool(child, "adi,three-conversion-cycles"))
diode->sensor_config |= LTC2983_DIODE_3_CONV_CYCLE(1);
- if (of_property_read_bool(child, "adi,average-on"))
+ if (fwnode_property_read_bool(child, "adi,average-on"))
diode->sensor_config |= LTC2983_DIODE_AVERAGE_ON(1);
/* validate channel index */
@@ -1040,8 +1042,8 @@ static struct ltc2983_sensor *ltc2983_diode_new(
diode->sensor.fault_handler = ltc2983_common_fault_handler;
diode->sensor.assign_chan = ltc2983_diode_assign_chan;
- ret = of_property_read_u32(child, "adi,excitation-current-microamp",
- &excitation_current);
+ ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
+ &excitation_current);
if (!ret) {
switch (excitation_current) {
case 10:
@@ -1064,7 +1066,7 @@ static struct ltc2983_sensor *ltc2983_diode_new(
}
}
- of_property_read_u32(child, "adi,ideal-factor-value", &temp);
+ fwnode_property_read_u32(child, "adi,ideal-factor-value", &temp);
/* 2^20 resolution */
diode->ideal_factor_value = __convert_to_raw(temp, 1048576);
@@ -1072,7 +1074,7 @@ static struct ltc2983_sensor *ltc2983_diode_new(
return &diode->sensor;
}
-static struct ltc2983_sensor *ltc2983_r_sense_new(struct device_node *child,
+static struct ltc2983_sensor *ltc2983_r_sense_new(struct fwnode_handle *child,
struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
@@ -1091,7 +1093,7 @@ static struct ltc2983_sensor *ltc2983_r_sense_new(struct device_node *child,
return ERR_PTR(-EINVAL);
}
- ret = of_property_read_u32(child, "adi,rsense-val-milli-ohms", &temp);
+ ret = fwnode_property_read_u32(child, "adi,rsense-val-milli-ohms", &temp);
if (ret) {
dev_err(&st->spi->dev, "Property adi,rsense-val-milli-ohms missing\n");
return ERR_PTR(-EINVAL);
@@ -1110,7 +1112,7 @@ static struct ltc2983_sensor *ltc2983_r_sense_new(struct device_node *child,
return &rsense->sensor;
}
-static struct ltc2983_sensor *ltc2983_adc_new(struct device_node *child,
+static struct ltc2983_sensor *ltc2983_adc_new(struct fwnode_handle *child,
struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
@@ -1120,7 +1122,7 @@ static struct ltc2983_sensor *ltc2983_adc_new(struct device_node *child,
if (!adc)
return ERR_PTR(-ENOMEM);
- if (of_property_read_bool(child, "adi,single-ended"))
+ if (fwnode_property_read_bool(child, "adi,single-ended"))
adc->single_ended = true;
if (!adc->single_ended &&
@@ -1264,17 +1266,15 @@ static irqreturn_t ltc2983_irq_handler(int irq, void *data)
static int ltc2983_parse_dt(struct ltc2983_data *st)
{
- struct device_node *child;
struct device *dev = &st->spi->dev;
+ struct fwnode_handle *child;
int ret = 0, chan = 0, channel_avail_mask = 0;
- of_property_read_u32(dev->of_node, "adi,mux-delay-config-us",
- &st->mux_delay_config);
+ device_property_read_u32(dev, "adi,mux-delay-config-us", &st->mux_delay_config);
- of_property_read_u32(dev->of_node, "adi,filter-notch-freq",
- &st->filter_notch_freq);
+ device_property_read_u32(dev, "adi,filter-notch-freq", &st->filter_notch_freq);
- st->num_channels = of_get_available_child_count(dev->of_node);
+ st->num_channels = device_get_child_node_count(dev);
if (!st->num_channels) {
dev_err(&st->spi->dev, "At least one channel must be given!");
return -EINVAL;
@@ -1286,10 +1286,10 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
return -ENOMEM;
st->iio_channels = st->num_channels;
- for_each_available_child_of_node(dev->of_node, child) {
+ device_for_each_child_node(dev, child) {
struct ltc2983_sensor sensor;
- ret = of_property_read_u32(child, "reg", &sensor.chan);
+ ret = fwnode_property_read_u32(child, "reg", &sensor.chan);
if (ret) {
dev_err(dev, "reg property must given for child nodes\n");
goto put_child;
@@ -1308,8 +1308,7 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
goto put_child;
}
- ret = of_property_read_u32(child, "adi,sensor-type",
- &sensor.type);
+ ret = fwnode_property_read_u32(child, "adi,sensor-type", &sensor.type);
if (ret) {
dev_err(dev,
"adi,sensor-type property must given for child nodes\n");
@@ -1363,7 +1362,7 @@ static int ltc2983_parse_dt(struct ltc2983_data *st)
return 0;
put_child:
- of_node_put(child);
+ fwnode_handle_put(child);
return ret;
}
--
2.34.1
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