This adds a new driver for the TI TLA2528 ADC chip.
Signed-off-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx>
---
drivers/iio/adc/Kconfig | 10 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ti-tla2528.c | 247 +++++++++++++++++++++++++++++++++++
3 files changed, 258 insertions(+)
create mode 100644 drivers/iio/adc/ti-tla2528.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index db0c8fb60515..f42e6d84c8f3 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1178,6 +1178,16 @@ config TI_AM335X_ADC
To compile this driver as a module, choose M here: the module will be
called ti_am335x_adc.
+config TI_TLA2528
+ tristate "Texas Instruments TLA2528 ADC driver"
+ depends on I2C
+ help
+ Say yes here to build support for Texas Instruments TLA2528
+ 12-Bit 8-Channel ADC.
+
+ To compile this driver as a module, choose M here: the module will be
+ called ti-tla2528.
+
config TI_TLC4541
tristate "Texas Instruments TLC4541 ADC driver"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index f70d877c555a..0bf287672838 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o
obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o
obj-$(CONFIG_TI_ADS131E08) += ti-ads131e08.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
+obj-$(CONFIG_TI_TLA2528) += ti-tla2528.o
obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o
obj-$(CONFIG_TI_TSC2046) += ti-tsc2046.o
obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
diff --git a/drivers/iio/adc/ti-tla2528.c b/drivers/iio/adc/ti-tla2528.c
new file mode 100644
index 000000000000..5c362f846bae
--- /dev/null
+++ b/drivers/iio/adc/ti-tla2528.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Texas Instruments TLA2528 ADC
+ *
+ * Copyright (C) 2020-2021 Rodolfo Giometti <giometti@xxxxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define TLA2528_OP_READ_REG 0x10
+#define TLA2528_OP_WRITE_REG 0x08
+
+#define TLA2528_GENERAL_CFG 0x01
+#define TLA2528_GENERAL_CFG_CNVST BIT(3)
+#define TLA2528_DATA_CFG 0x02
+#define TLA2528_DATA_CFG_APPEND_STATUS BIT(4)
+#define TLA2528_DATA_CFG_FIX_PAT BIT(7)
+#define TLA2528_PIN_CFG 0x05
+#define TLA2528_SEQUENCE_CFG 0x10
+#define TLA2528_CHANNEL_SEL 0x11
+
+struct tla2528_st {
+ struct i2c_client *client;
+ struct regulator *ref;
+
+ u8 last_read_channel;
+};
+
+static s32 i2c_smbus_read_sample(const struct i2c_client *client)
+{
+ struct i2c_msg msg[1];
+ u8 data[2];
+ int ret;
+
+ msg[0].addr = client->addr;
+ msg[0].flags = I2C_M_RD;
+ msg[0].buf = (u8 *) &data;
+ msg[0].len = 2;
+
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret < 0)
+ return ret;
+
+ return le16_to_cpu(data[1] | (data[0] << 8));
+}
+
+static s32 i2c_smbus_write_reg(const struct i2c_client *client, u8 reg, u8 val)
+{
+ struct i2c_msg msg[1];
+ u8 cmd[3] = {TLA2528_OP_WRITE_REG, reg, val};
+
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].buf = cmd;
+ msg[0].len = 3;
+
+ return i2c_transfer(client->adapter, msg, 1);
+}
+
+static int tla2528_read(struct tla2528_st *st, u8 channel, int *val)
+{
+ struct i2c_client *client = st->client;
+ int ret;
+
+ if (channel != st->last_read_channel) {
+ ret = i2c_smbus_write_reg(st->client,
+ TLA2528_CHANNEL_SEL, channel);
+ if (ret < 0)
+ return ret;
+
+ st->last_read_channel = channel;
+ }
+
+ /* Read ADC data (2 bytes) */
+ ret = i2c_smbus_read_sample(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "i2c_master_recv failed\n");
+ return ret;
+ }
+ *val = ret >> 4;
+
+ return 0;
+}
+
+static int tla2528_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct tla2528_st *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+ ret = tla2528_read(st, chan->channel, val);
+ mutex_unlock(&indio_dev->mlock);
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ ret = regulator_get_voltage(st->ref);
+ if (ret < 0)
+ return ret;
+
+ *val = ret / 1000;
+ *val2 = 12;
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+#define TLA2528_CHAN(_chan, _name) { \
+ .type = IIO_VOLTAGE, \
+ .channel = (_chan), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .datasheet_name = _name, \
+ .indexed = 1, \
+}
+
+static const struct iio_chan_spec tla2528_channel[] = {
+ TLA2528_CHAN(0, "AIN0"),
+ TLA2528_CHAN(1, "AIN1"),
+ TLA2528_CHAN(2, "AIN2"),
+ TLA2528_CHAN(3, "AIN3"),
+ TLA2528_CHAN(4, "AIN4"),
+ TLA2528_CHAN(5, "AIN5"),
+ TLA2528_CHAN(6, "AIN6"),
+ TLA2528_CHAN(7, "AIN7"),
+};
+
+static const struct iio_info tla2528_info = {
+ .read_raw = tla2528_read_raw,
+};
+
+static int tla2528_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct tla2528_st *st;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_WRITE_BYTE))
+ return -EOPNOTSUPP;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ st->client = client;
+
+ indio_dev->name = id->name;
+ indio_dev->info = &tla2528_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = tla2528_channel;
+ indio_dev->num_channels = ARRAY_SIZE(tla2528_channel);
+
+ st->ref = devm_regulator_get(&client->dev, "vref");
+ if (IS_ERR(st->ref))
+ return PTR_ERR(st->ref);
+
+ ret = regulator_enable(st->ref);
+ if (ret < 0)
+ return ret;
+
+ /* Set all inputs as analog */
+ ret = i2c_smbus_write_reg(st->client, TLA2528_PIN_CFG, 0x00);
+ if (ret < 0)
+ goto err_regulator_disable;
+
+ ret = i2c_smbus_write_reg(st->client, TLA2528_DATA_CFG,
+ TLA2528_DATA_CFG_APPEND_STATUS);
+ if (ret < 0)
+ goto err_regulator_disable;
+
+ /* Set manual mode */
+ ret = i2c_smbus_write_reg(st->client, TLA2528_SEQUENCE_CFG, 0x00);
+ if (ret < 0)
+ goto err_regulator_disable;
+
+ /* Init private data */
+ st->last_read_channel = ~0;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto err_regulator_disable;
+
+ return 0;
+
+err_regulator_disable:
+ regulator_disable(st->ref);
+
+ return ret;
+}
+
+static int tla2528_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct tla2528_st *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ regulator_disable(st->ref);
+
+ return 0;
+}
+
+static const struct i2c_device_id tla2528_id[] = {
+ { "tla2528", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tla2528_id);
+
+static const struct of_device_id tla2528_of_match[] = {
+ { .compatible = "ti,tla2528", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tla2528_of_match);
+
+static struct i2c_driver tla2528_driver = {
+ .driver = {
+ .name = "tla2528",
+ .of_match_table = tla2528_of_match,
+ },
+ .probe = tla2528_probe,
+ .remove = tla2528_remove,
+ .id_table = tla2528_id,
+};
+module_i2c_driver(tla2528_driver);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Texas Instruments TLA2528 ADC driver");
+MODULE_LICENSE("GPL v2");
--
2.25.1
