From patchwork Thu Apr 20 12:13:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Herve Codina X-Patchwork-Id: 13218681 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9994CC77B73 for ; Thu, 20 Apr 2023 12:14:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234773AbjDTMOS (ORCPT ); Thu, 20 Apr 2023 08:14:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234746AbjDTMOR (ORCPT ); Thu, 20 Apr 2023 08:14:17 -0400 Received: from relay11.mail.gandi.net (relay11.mail.gandi.net [217.70.178.231]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE56B5258; Thu, 20 Apr 2023 05:13:56 -0700 (PDT) Received: (Authenticated sender: herve.codina@bootlin.com) by mail.gandi.net (Postfix) with ESMTPA id 27D2E100011; Thu, 20 Apr 2023 12:13:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1681992835; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jNUNRSObWoEgsv11p7n+1Ndq/LND8+YwprENk7DCiw8=; b=Qc9pwbfc0PiPK0obo/5P+jnMVXvp/bQtdao47csZ7N7s/UPajAQAWVvfBZCdcsQqFL5/p4 MOZ1kyPBzdwJ/eaVzCtESlDeh9p3kB+Dv5bnRiQsrcLe3uontxPOVEtfn3W1P/lE2rYQJq PwVqSuHqTEub52Sw2QaRiififAdjd7dbqjLz5wG4ozBYIymIgX/nTnIYp/fL7BsICKgaor yMGmjuz9U3Ql/VAFllJ3dTSdsZp+4tfgThdilsYZbPKuTLdnDG1CCCLERQrm1n7jGhooYu 4X0eP6rWO8DZPwcEWwL2w3iAKe0itADkbf4cJX5zpP2zUYL3orsDIgp6c40kUQ== From: Herve Codina To: Herve Codina , Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Christophe Leroy , Thomas Petazzoni Subject: [PATCH 2/3] iio: potentiometer: Add support for the Renesas X9250 potentiometers Date: Thu, 20 Apr 2023 14:13:19 +0200 Message-Id: <20230420121320.252884-3-herve.codina@bootlin.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230420121320.252884-1-herve.codina@bootlin.com> References: <20230420121320.252884-1-herve.codina@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The Renesas X9250 integrates four digitally controlled potentiometers. On each potentiometer, the X9250T has a 100 kOhms total resistance and the X9250U has a 50 kOhms total resistance. Signed-off-by: Herve Codina --- drivers/iio/potentiometer/Kconfig | 10 ++ drivers/iio/potentiometer/Makefile | 1 + drivers/iio/potentiometer/x9250.c | 233 +++++++++++++++++++++++++++++ 3 files changed, 244 insertions(+) create mode 100644 drivers/iio/potentiometer/x9250.c diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig index 01dd3f858d99..e6a9a3c67845 100644 --- a/drivers/iio/potentiometer/Kconfig +++ b/drivers/iio/potentiometer/Kconfig @@ -136,4 +136,14 @@ config TPL0102 To compile this driver as a module, choose M here: the module will be called tpl0102. +config X9250 + tristate "Renesas X9250 quad controlled potentiometers" + depends on SPI + help + Enable support for the Renesas X9250 quad controlled + potentiometers. + + To compile this driver as a module, choose M here: the module + will be called x9250. + endmenu diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile index 5ebb8e3bbd76..d11fb739176c 100644 --- a/drivers/iio/potentiometer/Makefile +++ b/drivers/iio/potentiometer/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_MCP4131) += mcp4131.o obj-$(CONFIG_MCP4531) += mcp4531.o obj-$(CONFIG_MCP41010) += mcp41010.o obj-$(CONFIG_TPL0102) += tpl0102.o +obj-$(CONFIG_X9250) += x9250.o diff --git a/drivers/iio/potentiometer/x9250.c b/drivers/iio/potentiometer/x9250.c new file mode 100644 index 000000000000..9d3831f36054 --- /dev/null +++ b/drivers/iio/potentiometer/x9250.c @@ -0,0 +1,233 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * + * x9250.c -- Renesas X9250 potentiometers IIO driver + * + * Copyright 2023 CS GROUP France + * + * Author: Herve Codina + */ + +#include +#include +#include +#include +#include + +struct x9250_cfg { + int kohms; +}; + +struct x9250 { + struct spi_device *spi; + const struct x9250_cfg *cfg; + struct mutex lock; /* Protect tx and rx buffers */ + /* Cannot use stack area for SPI (dma-safe memory) */ + u8 spi_tx_buf[3] __aligned(IIO_DMA_MINALIGN); + u8 spi_rx_buf[3] __aligned(IIO_DMA_MINALIGN); +}; + +#define X9250_CMD_RD_WCR(_p) (0x90 | (_p)) +#define X9250_CMD_WR_WCR(_p) (0xa0 | (_p)) + +static int x9250_write8(struct x9250 *x9250, u8 cmd, u8 val) +{ + struct spi_transfer xfer = { + .tx_buf = &x9250->spi_tx_buf, + .len = 3, + }; + int ret; + + BUILD_BUG_ON(sizeof(x9250->spi_tx_buf) < 3); + + mutex_lock(&x9250->lock); + + x9250->spi_tx_buf[0] = 0x50; + x9250->spi_tx_buf[1] = cmd; + x9250->spi_tx_buf[2] = val; + + ret = spi_sync_transfer(x9250->spi, &xfer, 1); + + mutex_unlock(&x9250->lock); + + return ret; +} + +static int x9250_read8(struct x9250 *x9250, u8 cmd, u8 *val) +{ + struct spi_transfer xfer = { + .tx_buf = &x9250->spi_tx_buf, + .rx_buf = &x9250->spi_rx_buf, + .len = 3, + }; + int ret; + + BUILD_BUG_ON(sizeof(x9250->spi_tx_buf) < 3); + BUILD_BUG_ON(sizeof(x9250->spi_rx_buf) < 3); + + mutex_lock(&x9250->lock); + + x9250->spi_tx_buf[0] = 0x50; + x9250->spi_tx_buf[1] = cmd; + + ret = spi_sync_transfer(x9250->spi, &xfer, 1); + if (ret) + goto end; + + *val = x9250->spi_rx_buf[2]; + ret = 0; +end: + mutex_unlock(&x9250->lock); + return ret; +} + +#define X9250_CHANNEL(ch) { \ + .type = IIO_RESISTANCE, \ + .indexed = 1, \ + .output = 1, \ + .channel = (ch), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \ +} + +static const struct iio_chan_spec x9250_channels[] = { + X9250_CHANNEL(0), + X9250_CHANNEL(1), + X9250_CHANNEL(2), + X9250_CHANNEL(3), +}; + +static int x9250_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct x9250 *x9250 = iio_priv(indio_dev); + int ch = chan->channel; + int ret; + u8 v; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = x9250_read8(x9250, X9250_CMD_RD_WCR(ch), &v); + if (ret) + return ret; + *val = v; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + *val = 1000 * x9250->cfg->kohms; + *val2 = U8_MAX; + return IIO_VAL_FRACTIONAL; + } + + return -EINVAL; +} + +static int x9250_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, long mask) +{ + static const int range[] = {0, 1, 255}; /* min, step, max */ + + switch (mask) { + case IIO_CHAN_INFO_RAW: + *length = ARRAY_SIZE(range); + *vals = range; + *type = IIO_VAL_INT; + return IIO_AVAIL_RANGE; + } + + return -EINVAL; +} + +static int x9250_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct x9250 *x9250 = iio_priv(indio_dev); + int ch = chan->channel; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + if (val > U8_MAX || val < 0) + return -EINVAL; + + return x9250_write8(x9250, X9250_CMD_WR_WCR(ch), val); +} + +static const struct iio_info x9250_info = { + .read_raw = x9250_read_raw, + .read_avail = x9250_read_avail, + .write_raw = x9250_write_raw, +}; + +enum x9250_type { + X9250T, + X9250U, +}; + +static const struct x9250_cfg x9250_cfg[] = { + [X9250T] = { .kohms = 100, }, + [X9250U] = { .kohms = 50, }, +}; + +static int x9250_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct x9250 *x9250; + int ret; + + spi->bits_per_word = 8; + ret = spi_setup(spi); + if (ret < 0) + return ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*x9250)); + if (!indio_dev) + return -ENOMEM; + + x9250 = iio_priv(indio_dev); + x9250->spi = spi; + x9250->cfg = device_get_match_data(&spi->dev); + if (!x9250->cfg) + x9250->cfg = &x9250_cfg[spi_get_device_id(spi)->driver_data]; + + mutex_init(&x9250->lock); + + indio_dev->info = &x9250_info; + indio_dev->channels = x9250_channels; + indio_dev->num_channels = ARRAY_SIZE(x9250_channels); + indio_dev->name = spi_get_device_id(spi)->name; + + spi_set_drvdata(spi, indio_dev); + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct of_device_id x9250_of_match[] = { + { .compatible = "renesas,x9250t", &x9250_cfg[X9250T]}, + { .compatible = "renesas,x9250u", &x9250_cfg[X9250U]}, + { } +}; +MODULE_DEVICE_TABLE(of, x9250_of_match); + +static const struct spi_device_id x9250_id_table[] = { + { "x9250t", X9250T }, + { "x9250u", X9250U }, + { } +}; +MODULE_DEVICE_TABLE(spi, x9250_id_table); + +static struct spi_driver x9250_spi_driver = { + .driver = { + .name = "x9250", + .of_match_table = x9250_of_match, + }, + .id_table = x9250_id_table, + .probe = x9250_probe, +}; + +module_spi_driver(x9250_spi_driver); + +MODULE_AUTHOR("Herve Codina "); +MODULE_DESCRIPTION("X9250 ALSA SoC driver"); +MODULE_LICENSE("GPL");