From patchwork Mon Aug 2 10:21:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rodolfo Giometti X-Patchwork-Id: 12413671 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97148C4338F for ; Mon, 2 Aug 2021 10:28:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DDDA60F6E for ; Mon, 2 Aug 2021 10:28:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233207AbhHBK2w (ORCPT ); Mon, 2 Aug 2021 06:28:52 -0400 Received: from smtpcmd14162.aruba.it ([62.149.156.162]:35398 "EHLO smtpcmd14162.aruba.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231357AbhHBK2w (ORCPT ); Mon, 2 Aug 2021 06:28:52 -0400 X-Greylist: delayed 422 seconds by postgrey-1.27 at vger.kernel.org; Mon, 02 Aug 2021 06:28:52 EDT Received: from polimar.homenet.telecomitalia.it ([79.0.204.227]) by Aruba Outgoing Smtp with ESMTPSA id AV4dmcNSqrIRlAV4dmu9af; Mon, 02 Aug 2021 12:21:32 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=aruba.it; s=a1; t=1627899692; bh=PicATUGtKBTivGr8+mm0RjYViUESLKxdGV3g0s45TPA=; h=From:To:Subject:Date:MIME-Version; b=IYXtAT5/v+kKkLbSFM3wFe7HY+8iq6YzP7MWay038LGB/R/zINgEujmiAFzuuwli4 T7FqpWk27bJ050WeK4y1LvkNHlSCY8QHNNqDIrUqK7uNNOj0B6Aw/Nk3JQW9+/lbSX ZAYHOHbmQ38slB/uoLb6q8LfA9M/yyEKH69qbKa/IjyXbKthdjV8SLOxEn0/hm6be4 DrKqrQq+iP6gMzfHeUvxOrxnKGjlyZbaHn3RDgGIVnwFimUVl9/1YxV6iGftcZFfNU Q4LwxnW5oNcXkzUuqqNf3Mor4I8FxH8Mkv2WcnnmhSoL4+h5GDcpR4DpbQNKDyVDgS W26Fi0J4RP8vw== From: Rodolfo Giometti To: Jonathan Cameron , Lars-Peter Clausen Cc: linux-iio@vger.kernel.org Subject: [PATCH] drivers iio/adc: add driver for Texas Instruments TLA2528 adc Date: Mon, 2 Aug 2021 12:21:31 +0200 Message-Id: <20210802102131.856129-1-giometti@enneenne.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CMAE-Envelope: MS4wfOnmeGXLq/lYQo9eh0zd2tqNgCJd0c6kExeVI8YBtehWTOwV8tk5Tins3MCdXwF+2PZT6GxkIuigBAUNEJYtwpqjM8inY9EvD3ZBaoF3ZCvTXe6zJ+vZ jNU3CH4BFiUUIqErtd36VE2sPJMydp+UIz4Uv/IKW03AEFeUvZZw+1GzI1JhHEazCNS+pwLmKfNsnFei0zPTH+vmFASS2RXVeXRZs1oxoLdstAwuon2jdAS2 mfPhpZjFU+afXS0tXdMJgg== Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This adds a new driver for the TI TLA2528 ADC chip. Signed-off-by: Rodolfo Giometti --- drivers/iio/adc/Kconfig | 10 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-tla2528.c | 246 +++++++++++++++++++++++++++++++++++ 3 files changed, 257 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..4512362e1d2e --- /dev/null +++ b/drivers/iio/adc/ti-tla2528.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for Texas Instruments TLA2528 ADC + * + * Copyright (C) 2020-2021 Rodolfo Giometti + */ + +#include +#include +#include +#include +#include + +#include +#include + +#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); + + return (ret < 0) ? ret : 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->dev.parent = &client->dev; + 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 = of_match_ptr(tla2528_of_match), + }, + .probe = tla2528_probe, + .remove = tla2528_remove, + .id_table = tla2528_id, +}; +module_i2c_driver(tla2528_driver); + +MODULE_AUTHOR("Rodolfo Giometti "); +MODULE_DESCRIPTION("Texas Instruments TLA2528 ADC driver"); +MODULE_LICENSE("GPL v2");