From patchwork Mon Jun 14 11:35:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12318753 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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 84BBCC49EAF for ; Mon, 14 Jun 2021 11:40:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 588FB6023F for ; Mon, 14 Jun 2021 11:40:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236084AbhFNLmH (ORCPT ); Mon, 14 Jun 2021 07:42:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:59694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236560AbhFNLjQ (ORCPT ); Mon, 14 Jun 2021 07:39:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 058AD613DB; Mon, 14 Jun 2021 11:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623670442; bh=3cQb0fkXsyMgdnVLtCr3oXld4CpTKapsAbRRQ93VEMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WNNFDda2G7CH9X5svwU86+vA6g8wHzcp00cYRe7KBig8IPZeQlmjjPxglPLa3o/XC pbAJrxr1hiy/ygbnI0wNYtd6gwvtoGUqHKM99dRGemOYspz74S7RoqwOQQ28m2PvgI QL0+MXntTmBPoNAjPOAx4P1c8cn8Ce62kQjm0jV6gJAVONN30H0EjEsCtA9UOra3su p2Zpx8m6dbefUUZilqDpXoRFsAFoua/4lyuxO2BPc8430uIRAT/u9qiK4KloNqeTVZ RKxNkL1ZHee9Z4GCzH/qI62dFSqH4vBUsq8xkWfIYuWi6juhX3RnWzIiS1BnDKde7l Bmlql87ZntQrg== From: Jonathan Cameron To: linux-iio@vger.kernel.org, Rob Herring Cc: Michael.Hennerich@analog.com, lars@metafoo.de, devicetree@vger.kernel.org, Nuno Sa , Jonathan Cameron Subject: [PATCH 17/17] iio:adc:ad7280a: Move out of staging Date: Mon, 14 Jun 2021 12:35:07 +0100 Message-Id: <20210614113507.897732-18-jic23@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210614113507.897732-1-jic23@kernel.org> References: <20210614113507.897732-1-jic23@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Jonathan Cameron This is a rather unusual device (in IIO anyway). However, it has a near to standard userspace ABI. Note the work to move this out of staging was done against a minimal QEMU model, which doesn't model all the features of the device. I have no intention to upstream the QEMU model as it was developed just to enable this driver cleanup, but am happy to share it on request. Signed-off-by: Jonathan Cameron --- drivers/iio/adc/Kconfig | 11 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7280a.c | 1116 +++++++++++++++++++++++++++++ drivers/staging/iio/adc/Kconfig | 11 - drivers/staging/iio/adc/Makefile | 1 - drivers/staging/iio/adc/ad7280a.c | 1116 ----------------------------- 6 files changed, 1128 insertions(+), 1128 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index db0c8fb60515..ca748102dee5 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -64,6 +64,17 @@ config AD7266 To compile this driver as a module, choose M here: the module will be called ad7266. +config AD7280 + tristate "Analog Devices AD7280A Lithium Ion Battery Monitoring System" + depends on SPI + select CRC8 + help + Say yes here to build support for Analog Devices AD7280A + Lithium Ion Battery Monitoring System. + + To compile this driver as a module, choose M here: the + module will be called ad7280a + config AD7291 tristate "Analog Devices AD7291 ADC driver" depends on I2C diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index f70d877c555a..516671c2cff1 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o obj-$(CONFIG_AD7124) += ad7124.o obj-$(CONFIG_AD7192) += ad7192.o obj-$(CONFIG_AD7266) += ad7266.o +obj-$(CONFIG_AD7280) += ad7280a.o obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7292) += ad7292.o obj-$(CONFIG_AD7298) += ad7298.o diff --git a/drivers/iio/adc/ad7280a.c b/drivers/iio/adc/ad7280a.c new file mode 100644 index 000000000000..0806238debe3 --- /dev/null +++ b/drivers/iio/adc/ad7280a.c @@ -0,0 +1,1116 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AD7280A Lithium Ion Battery Monitoring System + * + * Copyright 2011 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +/* Registers */ + +#define AD7280A_CELL_VOLTAGE_1_REG 0x0 /* D11 to D0, Read only */ +#define AD7280A_CELL_VOLTAGE_2_REG 0x1 /* D11 to D0, Read only */ +#define AD7280A_CELL_VOLTAGE_3_REG 0x2 /* D11 to D0, Read only */ +#define AD7280A_CELL_VOLTAGE_4_REG 0x3 /* D11 to D0, Read only */ +#define AD7280A_CELL_VOLTAGE_5_REG 0x4 /* D11 to D0, Read only */ +#define AD7280A_CELL_VOLTAGE_6_REG 0x5 /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_1_REG 0x6 /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_2_REG 0x7 /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_3_REG 0x8 /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_4_REG 0x9 /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_5_REG 0xA /* D11 to D0, Read only */ +#define AD7280A_AUX_ADC_6_REG 0xB /* D11 to D0, Read only */ +#define AD7280A_SELF_TEST_REG 0xC /* D11 to D0, Read only */ + +#define AD7280A_CTRL_HB_REG 0xD /* D15 to D8, Read/write */ +#define AD7280A_CTRL_HB_CONV_INPUT_MSK GENMASK(7, 6) +#define AD7280A_CTRL_HB_CONV_INPUT_ALL 0 +#define AD7280A_CTRL_HB_CONV_INPUT_6CELL_AUX1_3_4 1 +#define AD7280A_CTRL_HB_CONV_INPUT_6CELL 2 +#define AD7280A_CTRL_HB_CONV_INPUT_SELF_TEST 3 +#define AD7280A_CTRL_HB_CONV_RREAD_MSK GENMASK(5, 4) +#define AD7280A_CTRL_HB_CONV_RREAD_ALL 0 +#define AD7280A_CTRL_HB_CONV_RREAD_6CELL_AUX1_3_4 1 +#define AD7280A_CTRL_HB_CONV_RREAD_6CELL 2 +#define AD7280A_CTRL_HB_CONV_RREAD_NO 3 +#define AD7280A_CTRL_HB_CONV_START_MSK BIT(3) +#define AD7280A_CTRL_HB_CONV_START_CNVST 0 +#define AD7280A_CTRL_HB_CONV_START_CS 1 +#define AD7280A_CTRL_HB_CONV_AVG_MSK GENMASK(2, 1) +#define AD7280A_CTRL_HB_CONV_AVG_DIS 0 +#define AD7280A_CTRL_HB_CONV_AVG_2 1 +#define AD7280A_CTRL_HB_CONV_AVG_4 2 +#define AD7280A_CTRL_HB_CONV_AVG_8 3 +#define AD7280A_CTRL_HB_PWRDN_SW BIT(0) + +#define AD7280A_CTRL_LB_REG 0xE /* D7 to D0, Read/write */ +#define AD7280A_CTRL_LB_SWRST_MSK BIT(7) +#define AD7280A_CTRL_LB_ACQ_TIME_MSK GENMASK(6, 5) +#define AD7280A_CTRL_LB_ACQ_TIME_400ns 0 +#define AD7280A_CTRL_LB_ACQ_TIME_800ns 1 +#define AD7280A_CTRL_LB_ACQ_TIME_1200ns 2 +#define AD7280A_CTRL_LB_ACQ_TIME_1600ns 3 +#define AD7280A_CTRL_LB_MUST_SET BIT(4) +#define AD7280A_CTRL_LB_THERMISTOR_MSK BIT(3) +#define AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK BIT(2) +#define AD7280A_CTRL_LB_INC_DEV_ADDR_MSK BIT(1) +#define AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK BIT(0) + +#define AD7280A_CELL_OVERVOLTAGE_REG 0xF /* D7 to D0, Read/write */ +#define AD7280A_CELL_UNDERVOLTAGE_REG 0x10 /* D7 to D0, Read/write */ +#define AD7280A_AUX_ADC_OVERVOLTAGE_REG 0x11 /* D7 to D0, Read/write */ +#define AD7280A_AUX_ADC_UNDERVOLTAGE_REG 0x12 /* D7 to D0, Read/write */ + +#define AD7280A_ALERT_REG 0x13 /* D7 to D0, Read/write */ +#define AD7280A_ALERT_REMOVE_MSK GENMASK(3, 0) +#define AD7280A_ALERT_REMOVE_AUX5 BIT(0) +#define AD7280A_ALERT_REMOVE_AUX4_AUX5 BIT(1) +#define AD7280A_ALERT_REMOVE_VIN5 BIT(2) +#define AD7280A_ALERT_REMOVE_VIN4_VIN5 BIT(3) +#define AD7280A_ALERT_GEN_STATIC_HIGH BIT(6) +#define AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN (BIT(7) | BIT(6)) + +#define AD7280A_CELL_BALANCE_REG 0x14 /* D7 to D0, Read/write */ +#define AD7280A_CB1_TIMER_REG 0x15 /* D7 to D0, Read/write */ +#define AD7280A_CB_TIMER_VAL_MSK GENMASK(7, 3) +#define AD7280A_CB2_TIMER_REG 0x16 /* D7 to D0, Read/write */ +#define AD7280A_CB3_TIMER_REG 0x17 /* D7 to D0, Read/write */ +#define AD7280A_CB4_TIMER_REG 0x18 /* D7 to D0, Read/write */ +#define AD7280A_CB5_TIMER_REG 0x19 /* D7 to D0, Read/write */ +#define AD7280A_CB6_TIMER_REG 0x1A /* D7 to D0, Read/write */ +#define AD7280A_PD_TIMER_REG 0x1B /* D7 to D0, Read/write */ +#define AD7280A_READ_REG 0x1C /* D7 to D0, Read/write */ +#define AD7280A_READ_ADDR_MSK GENMASK(7, 2) +#define AD7280A_CNVST_CTRL_REG 0x1D /* D7 to D0, Read/write */ + +/* Transfer fields */ +#define AD7280A_TRANS_WRITE_DEVADDR_MSK GENMASK(31, 27) +#define AD7280A_TRANS_WRITE_ADDR_MSK GENMASK(26, 21) +#define AD7280A_TRANS_WRITE_VAL_MSK GENMASK(20, 13) +#define AD7280A_TRANS_WRITE_ALL_MSK BIT(12) +#define AD7280A_TRANS_WRITE_CRC_MSK GENMASK(10, 3) +#define AD7280A_TRANS_WRITE_RES_PATTERN 0x2 + +/* Layouts differ for channel vs other registers */ +#define AD7280A_TRANS_READ_DEVADDR_MSK GENMASK(31, 27) +#define AD7280A_TRANS_READ_CONV_CHANADDR_MSK GENMASK(26, 23) +#define AD7280A_TRANS_READ_CONV_DATA_MSK GENMASK(22, 11) +#define AD7280A_TRANS_READ_REG_REGADDR_MSK GENMASK(26, 21) +#define AD7280A_TRANS_READ_REG_DATA_MSK GENMASK(20, 13) +#define AD7280A_TRANS_READ_WRITE_ACK_MSK BIT(10) +#define AD7280A_TRANS_READ_CRC_MSK GENMASK(9, 2) + +/* Magic value used to indicate this special case */ +#define AD7280A_ALL_CELLS (0xAD << 16) + +#define AD7280A_MAX_SPI_CLK_HZ 700000 /* < 1MHz */ +#define AD7280A_MAX_CHAIN 8 +#define AD7280A_CELLS_PER_DEV 6 +#define AD7280A_BITS 12 +#define AD7280A_NUM_CH (AD7280A_AUX_ADC_6_REG - \ + AD7280A_CELL_VOLTAGE_1_REG + 1) + +#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \ + (c)) +#define AD7280A_CALC_TEMP_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \ + (c) - AD7280A_CELLS_PER_DEV) + +#define AD7280A_DEVADDR_MASTER 0 +#define AD7280A_DEVADDR_ALL 0x1F + +static const unsigned short ad7280a_n_avg[4] = {1, 2, 4, 8}; +static const unsigned short ad7280a_t_acq_ns[4] = {465, 1010, 1460, 1890}; + +/* 5-bit device address is sent LSB first */ +static unsigned int ad7280a_devaddr(unsigned int addr) +{ + return ((addr & 0x1) << 4) | + ((addr & 0x2) << 2) | + (addr & 0x4) | + ((addr & 0x8) >> 2) | + ((addr & 0x10) >> 4); +} + +/* + * During a read a valid write is mandatory. + * So writing to the highest available address (Address 0x1F) and setting the + * address all parts bit to 0 is recommended. + * So the TXVAL is AD7280A_DEVADDR_ALL + CRC + */ +#define AD7280A_READ_TXVAL 0xF800030A + +/* + * AD7280 CRC + * + * P(x) = x^8 + x^5 + x^3 + x^2 + x^1 + x^0 = 0b100101111 => 0x2F + */ +#define POLYNOM 0x2F + +struct ad7280_state { + struct spi_device *spi; + struct iio_chan_spec *channels; + unsigned int chain_last_alert_ignore; + bool thermistor_term_en; + int slave_num; + int scan_cnt; + int readback_delay_us; + unsigned char crc_tab[CRC8_TABLE_SIZE]; + u8 oversampling_ratio; + u8 acquisition_time; + unsigned char ctrl_lb; + unsigned char cell_threshhigh; + unsigned char cell_threshlow; + unsigned char aux_threshhigh; + unsigned char aux_threshlow; + unsigned char cb_mask[AD7280A_MAX_CHAIN]; + struct mutex lock; /* protect sensor state */ + + __be32 tx ____cacheline_aligned; + __be32 rx; +}; + +static unsigned char ad7280_calc_crc8(unsigned char *crc_tab, unsigned int val) +{ + unsigned char crc; + + crc = crc_tab[val >> 16 & 0xFF]; + crc = crc_tab[crc ^ (val >> 8 & 0xFF)]; + + return crc ^ (val & 0xFF); +} + +static int ad7280_check_crc(struct ad7280_state *st, unsigned int val) +{ + unsigned char crc = ad7280_calc_crc8(st->crc_tab, val >> 10); + + if (crc != ((val >> 2) & 0xFF)) + return -EIO; + + return 0; +} + +/* + * After initiating a conversion sequence we need to wait until the conversion + * is done. The delay is typically in the range of 15..30us however depending on + * the number of devices in the daisy chain, the number of averages taken, + * conversion delays and acquisition time options it may take up to 250us, in + * this case we better sleep instead of busy wait. + */ + +static void ad7280_delay(struct ad7280_state *st) +{ + if (st->readback_delay_us < 50) + udelay(st->readback_delay_us); + else + usleep_range(250, 500); +} + +static int __ad7280_read32(struct ad7280_state *st, unsigned int *val) +{ + int ret; + struct spi_transfer t = { + .tx_buf = &st->tx, + .rx_buf = &st->rx, + .len = sizeof(st->tx), + }; + + st->tx = cpu_to_be32(AD7280A_READ_TXVAL); + + ret = spi_sync_transfer(st->spi, &t, 1); + if (ret) + return ret; + + *val = be32_to_cpu(st->rx); + + return 0; +} + +static int ad7280_write(struct ad7280_state *st, unsigned int devaddr, + unsigned int addr, bool all, unsigned int val) +{ + unsigned int reg = FIELD_PREP(AD7280A_TRANS_WRITE_DEVADDR_MSK, devaddr) | + FIELD_PREP(AD7280A_TRANS_WRITE_ADDR_MSK, addr) | + FIELD_PREP(AD7280A_TRANS_WRITE_VAL_MSK, val) | + FIELD_PREP(AD7280A_TRANS_WRITE_ALL_MSK, all); + + reg |= FIELD_PREP(AD7280A_TRANS_WRITE_CRC_MSK, + ad7280_calc_crc8(st->crc_tab, reg >> 11)); + /* Reserved b010 pattern not included crc calc */ + reg |= AD7280A_TRANS_WRITE_RES_PATTERN; + + st->tx = cpu_to_be32(reg); + + return spi_write(st->spi, &st->tx, sizeof(st->tx)); +} + +static int ad7280_read_reg(struct ad7280_state *st, unsigned int devaddr, + unsigned int addr) +{ + int ret; + unsigned int tmp; + + /* turns off the read operation on all parts */ + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, + FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, + AD7280A_CTRL_HB_CONV_INPUT_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, + AD7280A_CTRL_HB_CONV_RREAD_NO) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, + st->oversampling_ratio)); + if (ret) + return ret; + + /* turns on the read operation on the addressed part */ + ret = ad7280_write(st, devaddr, AD7280A_CTRL_HB_REG, 0, + FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, + AD7280A_CTRL_HB_CONV_INPUT_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, + AD7280A_CTRL_HB_CONV_RREAD_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, + st->oversampling_ratio)); + if (ret) + return ret; + + /* Set register address on the part to be read from */ + ret = ad7280_write(st, devaddr, AD7280A_READ_REG, 0, + FIELD_PREP(AD7280A_READ_ADDR_MSK, addr)); + if (ret) + return ret; + + ret = __ad7280_read32(st, &tmp); + if (ret) + return ret; + + if (ad7280_check_crc(st, tmp)) + return -EIO; + + if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) || + (FIELD_GET(AD7280A_TRANS_READ_REG_REGADDR_MSK, tmp) != addr)) + return -EFAULT; + + return FIELD_GET(AD7280A_TRANS_READ_REG_DATA_MSK, tmp); +} + +static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr, + unsigned int addr) +{ + int ret; + unsigned int tmp; + + ret = ad7280_write(st, devaddr, AD7280A_READ_REG, 0, + FIELD_PREP(AD7280A_READ_ADDR_MSK, addr)); + if (ret) + return ret; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, + FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, + AD7280A_CTRL_HB_CONV_INPUT_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, + AD7280A_CTRL_HB_CONV_RREAD_NO) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, + st->oversampling_ratio)); + if (ret) + return ret; + + ret = ad7280_write(st, devaddr, AD7280A_CTRL_HB_REG, 0, + FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, + AD7280A_CTRL_HB_CONV_INPUT_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, + AD7280A_CTRL_HB_CONV_RREAD_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_START_MSK, + AD7280A_CTRL_HB_CONV_START_CS) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, + st->oversampling_ratio)); + if (ret) + return ret; + + ad7280_delay(st); + + ret = __ad7280_read32(st, &tmp); + if (ret) + return ret; + + if (ad7280_check_crc(st, tmp)) + return -EIO; + + if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) || + (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) != addr)) + return -EFAULT; + + return FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp); +} + +static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt, + unsigned int *array) +{ + int i, ret; + unsigned int tmp, sum = 0; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ_REG, 1, + AD7280A_CELL_VOLTAGE_1_REG << 2); + if (ret) + return ret; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, + FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, + AD7280A_CTRL_HB_CONV_INPUT_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, + AD7280A_CTRL_HB_CONV_RREAD_ALL) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_START_MSK, + AD7280A_CTRL_HB_CONV_START_CS) | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, + st->oversampling_ratio)); + if (ret) + return ret; + + ad7280_delay(st); + + for (i = 0; i < cnt; i++) { + ret = __ad7280_read32(st, &tmp); + if (ret) + return ret; + + if (ad7280_check_crc(st, tmp)) + return -EIO; + + if (array) + array[i] = tmp; + /* only sum cell voltages */ + if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) <= + AD7280A_CELL_VOLTAGE_6_REG) + sum += FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp); + } + + return sum; +} + +static void ad7280_sw_power_down(void *data) +{ + struct ad7280_state *st = data; + + ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, + AD7280A_CTRL_HB_PWRDN_SW | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio)); +} + +static int ad7280_chain_setup(struct ad7280_state *st) +{ + unsigned int val, n; + int ret; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_LB_REG, 1, + FIELD_PREP(AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK, 1) | + FIELD_PREP(AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK, 1) | + AD7280A_CTRL_LB_MUST_SET | + FIELD_PREP(AD7280A_CTRL_LB_SWRST_MSK, 1) | + st->ctrl_lb); + if (ret) + return ret; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_LB_REG, 1, + FIELD_PREP(AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK, 1) | + FIELD_PREP(AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK, 1) | + AD7280A_CTRL_LB_MUST_SET | + FIELD_PREP(AD7280A_CTRL_LB_SWRST_MSK, 0) | + st->ctrl_lb); + if (ret) + goto error_power_down; + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ_REG, 1, + FIELD_PREP(AD7280A_READ_ADDR_MSK, AD7280A_CTRL_LB_REG)); + if (ret) + goto error_power_down; + + for (n = 0; n <= AD7280A_MAX_CHAIN; n++) { + ret = __ad7280_read32(st, &val); + if (ret) + goto error_power_down; + + if (val == 0) + return n - 1; + + if (ad7280_check_crc(st, val)) { + ret = -EIO; + goto error_power_down; + } + + if (n != ad7280a_devaddr(FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, val))) { + ret = -EIO; + goto error_power_down; + } + } + ret = -EFAULT; + +error_power_down: + ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, + AD7280A_CTRL_HB_PWRDN_SW | + FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio)); + + return ret; +} + +static ssize_t ad7280_show_balance_sw(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, char *buf) +{ + struct ad7280_state *st = iio_priv(indio_dev); + + return sysfs_emit(buf, "%d\n", + !!(st->cb_mask[chan->address >> 8] & + (1 << ((chan->address & 0xFF) + 2)))); +} + +static ssize_t ad7280_store_balance_sw(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct ad7280_state *st = iio_priv(indio_dev); + unsigned int devaddr, ch; + bool readin; + int ret; + + ret = strtobool(buf, &readin); + if (ret) + return ret; + + devaddr = chan->address >> 8; + ch = chan->address & 0xFF; + + mutex_lock(&st->lock); + if (readin) + st->cb_mask[devaddr] |= 1 << (ch + 2); + else + st->cb_mask[devaddr] &= ~(1 << (ch + 2)); + + ret = ad7280_write(st, devaddr, AD7280A_CELL_BALANCE_REG, + 0, st->cb_mask[devaddr]); + mutex_unlock(&st->lock); + + return ret ? ret : len; +} + +static ssize_t ad7280_show_balance_timer(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct ad7280_state *st = iio_priv(indio_dev); + unsigned int msecs; + int ret; + + mutex_lock(&st->lock); + ret = ad7280_read_reg(st, chan->address >> 8, + (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG); + mutex_unlock(&st->lock); + + if (ret < 0) + return ret; + + msecs = FIELD_GET(AD7280A_CB_TIMER_VAL_MSK, ret) * 71500; + + return sysfs_emit(buf, "%u.%u\n", msecs / 1000, msecs % 1000); +} + +static ssize_t ad7280_store_balance_timer(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct ad7280_state *st = iio_priv(indio_dev); + int val, val2; + int ret; + + ret = iio_str_to_fixpoint(buf, 1000, &val, &val2); + if (ret) + return ret; + + val = val * 1000 + val2; + val /= 71500; + + if (val > 31) + return -EINVAL; + + mutex_lock(&st->lock); + ret = ad7280_write(st, chan->address >> 8, + (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG, 0, + FIELD_PREP(AD7280A_CB_TIMER_VAL_MSK, val)); + mutex_unlock(&st->lock); + + return ret ? ret : len; +} + +static const struct iio_chan_spec_ext_info ad7280_cell_ext_info[] = { + { + .name = "balance_switch_en", + .read = ad7280_show_balance_sw, + .write = ad7280_store_balance_sw, + .shared = IIO_SEPARATE, + }, { + .name = "balance_switch_timer", + .read = ad7280_show_balance_timer, + .write = ad7280_store_balance_timer, + .shared = IIO_SEPARATE, + }, + {} +}; + +static const struct iio_event_spec ad7280_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), + }, +}; + +static void ad7280_voltage_channel_init(struct iio_chan_spec *chan, int i, + bool irq_present) +{ + chan->type = IIO_VOLTAGE; + chan->differential = 1; + chan->channel = i; + chan->channel2 = chan->channel + 1; + if (irq_present) { + chan->event_spec = ad7280_events; + chan->num_event_specs = ARRAY_SIZE(ad7280_events); + } + chan->ext_info = ad7280_cell_ext_info; +} + +static void ad7280_temp_channel_init(struct iio_chan_spec *chan, int i, + bool irq_present) +{ + chan->type = IIO_TEMP; + chan->channel = i; + if (irq_present) { + chan->event_spec = ad7280_events; + chan->num_event_specs = ARRAY_SIZE(ad7280_events); + } +} + +static void ad7280_common_fields_init(struct iio_chan_spec *chan, int addr, + int cnt) +{ + chan->indexed = 1; + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); + chan->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO); + chan->address = addr; + chan->scan_index = cnt; + chan->scan_type.sign = 'u'; + chan->scan_type.realbits = 12; + chan->scan_type.storagebits = 32; +} + +static void ad7280_total_voltage_channel_init(struct iio_chan_spec *chan, + int cnt, int dev) +{ + chan->type = IIO_VOLTAGE; + chan->differential = 1; + chan->channel = 0; + chan->channel2 = dev * AD7280A_CELLS_PER_DEV; + chan->address = AD7280A_ALL_CELLS; + chan->indexed = 1; + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); + chan->scan_index = cnt; + chan->scan_type.sign = 'u'; + chan->scan_type.realbits = 32; + chan->scan_type.storagebits = 32; +} + +static void ad7280_init_dev_channels(struct ad7280_state *st, int dev, int *cnt, + bool irq_present) +{ + int addr, ch, i; + struct iio_chan_spec *chan; + + for (ch = AD7280A_CELL_VOLTAGE_1_REG; ch <= AD7280A_AUX_ADC_6_REG; ch++) { + chan = &st->channels[*cnt]; + + if (ch < AD7280A_AUX_ADC_1_REG) { + i = AD7280A_CALC_VOLTAGE_CHAN_NUM(dev, ch); + ad7280_voltage_channel_init(chan, i, irq_present); + } else { + i = AD7280A_CALC_TEMP_CHAN_NUM(dev, ch); + ad7280_temp_channel_init(chan, i, irq_present); + } + + addr = ad7280a_devaddr(dev) << 8 | ch; + ad7280_common_fields_init(chan, addr, *cnt); + + (*cnt)++; + } +} + +static int ad7280_channel_init(struct ad7280_state *st, bool irq_present) +{ + int dev, cnt = 0; + + st->channels = devm_kcalloc(&st->spi->dev, (st->slave_num + 1) * 12 + 1, + sizeof(*st->channels), GFP_KERNEL); + if (!st->channels) + return -ENOMEM; + + for (dev = 0; dev <= st->slave_num; dev++) + ad7280_init_dev_channels(st, dev, &cnt, irq_present); + + ad7280_total_voltage_channel_init(&st->channels[cnt], cnt, dev); + + return cnt + 1; +} + +static int ad7280a_read_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, int *val, int *val2) +{ + struct ad7280_state *st = iio_priv(indio_dev); + + switch (chan->type) { + case IIO_VOLTAGE: + switch (dir) { + case IIO_EV_DIR_RISING: + *val = 1000 + (st->cell_threshhigh * 1568L) / 100; + return IIO_VAL_INT; + case IIO_EV_DIR_FALLING: + *val = 1000 + (st->cell_threshlow * 1568L) / 100; + return IIO_VAL_INT; + default: + return -EINVAL; + } + break; + case IIO_TEMP: + switch (dir) { + case IIO_EV_DIR_RISING: + *val = ((st->aux_threshhigh) * 196L) / 10; + return IIO_VAL_INT; + case IIO_EV_DIR_FALLING: + *val = (st->aux_threshlow * 196L) / 10; + return IIO_VAL_INT; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } +} + +static int ad7280a_write_thresh(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + struct ad7280_state *st = iio_priv(indio_dev); + unsigned int addr; + long value; + int ret; + + if (val2 != 0) + return -EINVAL; + + mutex_lock(&st->lock); + switch (chan->type) { + case IIO_VOLTAGE: + value = ((val - 1000) * 100) / 1568; /* LSB 15.68mV */ + value = clamp(value, 0L, 0xFFL); + switch (dir) { + case IIO_EV_DIR_RISING: + addr = AD7280A_CELL_OVERVOLTAGE_REG; + st->cell_threshhigh = value; + break; + case IIO_EV_DIR_FALLING: + addr = AD7280A_CELL_UNDERVOLTAGE_REG; + st->cell_threshlow = value; + break; + default: + ret = -EINVAL; + goto err_unlock; + } + break; + case IIO_TEMP: + value = (val * 10) / 196; /* LSB 19.6mV */ + value = clamp(value, 0L, 0xFFL); + switch (dir) { + case IIO_EV_DIR_RISING: + addr = AD7280A_AUX_ADC_OVERVOLTAGE_REG; + st->aux_threshhigh = val; + break; + case IIO_EV_DIR_FALLING: + addr = AD7280A_AUX_ADC_UNDERVOLTAGE_REG; + st->aux_threshlow = val; + break; + default: + ret = -EINVAL; + goto err_unlock; + } + break; + default: + ret = -EINVAL; + goto err_unlock; + } + + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, addr, 1, val); +err_unlock: + mutex_unlock(&st->lock); + + return ret; +} + +static irqreturn_t ad7280_event_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct ad7280_state *st = iio_priv(indio_dev); + unsigned int *channels; + int i, ret; + + channels = kcalloc(st->scan_cnt, sizeof(*channels), GFP_KERNEL); + if (!channels) + return IRQ_HANDLED; + + ret = ad7280_read_all_channels(st, st->scan_cnt, channels); + if (ret < 0) + goto out; + + for (i = 0; i < st->scan_cnt; i++) { + unsigned int val; + + val = FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, channels[i]); + if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, channels[i]) + <= AD7280A_CELL_VOLTAGE_6_REG) { + if (val >= st->cell_threshhigh) { + u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0, + IIO_EV_DIR_RISING, + IIO_EV_TYPE_THRESH, + 0, 0, 0); + iio_push_event(indio_dev, tmp, + iio_get_time_ns(indio_dev)); + } else if (val <= st->cell_threshlow) { + u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0, + IIO_EV_DIR_FALLING, + IIO_EV_TYPE_THRESH, + 0, 0, 0); + iio_push_event(indio_dev, tmp, + iio_get_time_ns(indio_dev)); + } + } else { + if (val >= st->aux_threshhigh) { + u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING); + iio_push_event(indio_dev, tmp, + iio_get_time_ns(indio_dev)); + } else if (val <= st->aux_threshlow) { + u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING); + iio_push_event(indio_dev, tmp, + iio_get_time_ns(indio_dev)); + } + } + } + +out: + kfree(channels); + + return IRQ_HANDLED; +} + +static void ad7280_update_delay(struct ad7280_state *st) +{ + /* + * Total Conversion Time = ((tACQ + tCONV) * + * (Number of Conversions per Part)) − + * tACQ + ((N - 1) * tDELAY) + * + * Readback Delay = Total Conversion Time + tWAIT + */ + + st->readback_delay_us = + ((ad7280a_t_acq_ns[st->acquisition_time & 0x3] + 695) * + (AD7280A_NUM_CH * ad7280a_n_avg[st->oversampling_ratio & 0x3])) - + ad7280a_t_acq_ns[st->acquisition_time & 0x3] + st->slave_num * 250; + + /* Convert to usecs */ + st->readback_delay_us = DIV_ROUND_UP(st->readback_delay_us, 1000); + st->readback_delay_us += 5; /* Add tWAIT */ +} + +static int ad7280_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad7280_state *st = iio_priv(indio_dev); + int ret; + + switch (m) { + case IIO_CHAN_INFO_RAW: + mutex_lock(&st->lock); + if (chan->address == AD7280A_ALL_CELLS) + ret = ad7280_read_all_channels(st, st->scan_cnt, NULL); + else + ret = ad7280_read_channel(st, chan->address >> 8, + chan->address & 0xFF); + mutex_unlock(&st->lock); + + if (ret < 0) + return ret; + + *val = ret; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + if ((chan->address & 0xFF) <= AD7280A_CELL_VOLTAGE_6_REG) + *val = 4000; + else + *val = 5000; + + *val2 = AD7280A_BITS; + return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + *val = ad7280a_n_avg[st->oversampling_ratio]; + return IIO_VAL_INT; + } + return -EINVAL; +} + +static int ad7280_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ad7280_state *st = iio_priv(indio_dev); + int i; + + switch (mask) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + if (val2 != 0) + return -EINVAL; + for (i = 0; i < ARRAY_SIZE(ad7280a_n_avg); i++) { + if (val == ad7280a_n_avg[i]) { + st->oversampling_ratio = i; + ad7280_update_delay(st); + return 0; + } + } + return -EINVAL; + default: + return -EINVAL; + } +} + +static const struct iio_info ad7280_info = { + .read_raw = ad7280_read_raw, + .write_raw = ad7280_write_raw, + .read_event_value = &ad7280a_read_thresh, + .write_event_value = &ad7280a_write_thresh, +}; + +static const struct iio_info ad7280_info_no_irq = { + .read_event_value = &ad7280a_read_thresh, + .write_event_value = &ad7280a_write_thresh, +}; + +static int ad7280_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ad7280_state *st; + int ret; + struct iio_dev *indio_dev; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + spi_set_drvdata(spi, indio_dev); + st->spi = spi; + mutex_init(&st->lock); + + st->thermistor_term_en = + device_property_read_bool(dev, "adi,thermistor-termination"); + + if (device_property_present(dev, "adi,acquistion-time-ns")) { + u32 val; + + ret = device_property_read_u32(dev, "adi,acquisition-time-ns", &val); + if (ret) + return ret; + + switch (val) { + case 400: + st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns; + break; + case 800: + st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_800ns; + break; + case 1200: + st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1200ns; + break; + case 1600: + st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1600ns; + break; + default: + dev_err(dev, "Firmware provided acquisition time is invalid\n"); + return -EINVAL; + } + } else { + st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns; + } + + /* Alert masks are intended for when particular inputs are not wired up */ + if (device_property_present(dev, "adi,voltage-alert-last-chan")) { + u8 val; + + ret = device_property_read_u8(dev, "adi,voltage-alert-last-chan", &val); + if (ret) + return ret; + + switch (val) { + case 3: + st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN4_VIN5; + break; + case 4: + st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN5; + break; + case 5: + break; + default: + dev_err(dev, + "Firmware provided last voltage alert channel invalid\n"); + break; + } + } + if (device_property_present(dev, "adi,temp-alert-last-chan")) { + u8 val; + + ret = device_property_read_u8(dev, "adi,temp-alert-last-chan", &val); + if (ret) + return ret; + + switch (val) { + case 3: + st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_AUX4_AUX5; + break; + case 4: + st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_AUX5; + break; + case 5: + break; + default: + dev_err(dev, + "Firmware provided last temp alert channel invalid\n"); + break; + } + } + crc8_populate_msb(st->crc_tab, POLYNOM); + + st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ; + st->spi->mode = SPI_MODE_1; + spi_setup(st->spi); + + st->ctrl_lb = FIELD_PREP(AD7280A_CTRL_LB_ACQ_TIME_MSK, st->acquisition_time) | + FIELD_PREP(AD7280A_CTRL_LB_THERMISTOR_MSK, st->thermistor_term_en); + st->oversampling_ratio = 0; /* No oversampling */ + + ret = ad7280_chain_setup(st); + if (ret < 0) + return ret; + + st->slave_num = ret; + st->scan_cnt = (st->slave_num + 1) * AD7280A_NUM_CH; + st->cell_threshhigh = 0xFF; + st->aux_threshhigh = 0xFF; + + ret = devm_add_action_or_reset(dev, ad7280_sw_power_down, st); + if (ret) + return ret; + + ad7280_update_delay(st); + + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = ad7280_channel_init(st, spi->irq > 0); + if (ret < 0) + return ret; + + indio_dev->num_channels = ret; + indio_dev->channels = st->channels; + if (spi->irq > 0) { + ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, + AD7280A_ALERT_REG, 1, + AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN); + if (ret) + return ret; + + ret = ad7280_write(st, ad7280a_devaddr(st->slave_num), + AD7280A_ALERT_REG, 0, + AD7280A_ALERT_GEN_STATIC_HIGH | + FIELD_PREP(AD7280A_ALERT_REMOVE_MSK, + st->chain_last_alert_ignore)); + if (ret) + return ret; + + ret = devm_request_threaded_irq(dev, spi->irq, + NULL, + ad7280_event_handler, + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + indio_dev->name, + indio_dev); + if (ret) + return ret; + + indio_dev->info = &ad7280_info; + } else { + indio_dev->info = &ad7280_info_no_irq; + } + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct spi_device_id ad7280_id[] = { + {"ad7280a", 0}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad7280_id); + +static struct spi_driver ad7280_driver = { + .driver = { + .name = "ad7280", + }, + .probe = ad7280_probe, + .id_table = ad7280_id, +}; +module_spi_driver(ad7280_driver); + +MODULE_AUTHOR("Michael Hennerich "); +MODULE_DESCRIPTION("Analog Devices AD7280A"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index b25f41053fac..2f0d6cf048d2 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -15,15 +15,4 @@ config AD7816 To compile this driver as a module, choose M here: the module will be called ad7816. -config AD7280 - tristate "Analog Devices AD7280A Lithium Ion Battery Monitoring System" - depends on SPI - select CRC8 - help - Say yes here to build support for Analog Devices AD7280A - Lithium Ion Battery Monitoring System. - - To compile this driver as a module, choose M here: the - module will be called ad7280a - endmenu diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 6436a62b6278..1e2a94c4db84 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -4,4 +4,3 @@ # obj-$(CONFIG_AD7816) += ad7816.o -obj-$(CONFIG_AD7280) += ad7280a.o diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c deleted file mode 100644 index 0806238debe3..000000000000 --- a/drivers/staging/iio/adc/ad7280a.c +++ /dev/null @@ -1,1116 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * AD7280A Lithium Ion Battery Monitoring System - * - * Copyright 2011 Analog Devices Inc. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -/* Registers */ - -#define AD7280A_CELL_VOLTAGE_1_REG 0x0 /* D11 to D0, Read only */ -#define AD7280A_CELL_VOLTAGE_2_REG 0x1 /* D11 to D0, Read only */ -#define AD7280A_CELL_VOLTAGE_3_REG 0x2 /* D11 to D0, Read only */ -#define AD7280A_CELL_VOLTAGE_4_REG 0x3 /* D11 to D0, Read only */ -#define AD7280A_CELL_VOLTAGE_5_REG 0x4 /* D11 to D0, Read only */ -#define AD7280A_CELL_VOLTAGE_6_REG 0x5 /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_1_REG 0x6 /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_2_REG 0x7 /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_3_REG 0x8 /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_4_REG 0x9 /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_5_REG 0xA /* D11 to D0, Read only */ -#define AD7280A_AUX_ADC_6_REG 0xB /* D11 to D0, Read only */ -#define AD7280A_SELF_TEST_REG 0xC /* D11 to D0, Read only */ - -#define AD7280A_CTRL_HB_REG 0xD /* D15 to D8, Read/write */ -#define AD7280A_CTRL_HB_CONV_INPUT_MSK GENMASK(7, 6) -#define AD7280A_CTRL_HB_CONV_INPUT_ALL 0 -#define AD7280A_CTRL_HB_CONV_INPUT_6CELL_AUX1_3_4 1 -#define AD7280A_CTRL_HB_CONV_INPUT_6CELL 2 -#define AD7280A_CTRL_HB_CONV_INPUT_SELF_TEST 3 -#define AD7280A_CTRL_HB_CONV_RREAD_MSK GENMASK(5, 4) -#define AD7280A_CTRL_HB_CONV_RREAD_ALL 0 -#define AD7280A_CTRL_HB_CONV_RREAD_6CELL_AUX1_3_4 1 -#define AD7280A_CTRL_HB_CONV_RREAD_6CELL 2 -#define AD7280A_CTRL_HB_CONV_RREAD_NO 3 -#define AD7280A_CTRL_HB_CONV_START_MSK BIT(3) -#define AD7280A_CTRL_HB_CONV_START_CNVST 0 -#define AD7280A_CTRL_HB_CONV_START_CS 1 -#define AD7280A_CTRL_HB_CONV_AVG_MSK GENMASK(2, 1) -#define AD7280A_CTRL_HB_CONV_AVG_DIS 0 -#define AD7280A_CTRL_HB_CONV_AVG_2 1 -#define AD7280A_CTRL_HB_CONV_AVG_4 2 -#define AD7280A_CTRL_HB_CONV_AVG_8 3 -#define AD7280A_CTRL_HB_PWRDN_SW BIT(0) - -#define AD7280A_CTRL_LB_REG 0xE /* D7 to D0, Read/write */ -#define AD7280A_CTRL_LB_SWRST_MSK BIT(7) -#define AD7280A_CTRL_LB_ACQ_TIME_MSK GENMASK(6, 5) -#define AD7280A_CTRL_LB_ACQ_TIME_400ns 0 -#define AD7280A_CTRL_LB_ACQ_TIME_800ns 1 -#define AD7280A_CTRL_LB_ACQ_TIME_1200ns 2 -#define AD7280A_CTRL_LB_ACQ_TIME_1600ns 3 -#define AD7280A_CTRL_LB_MUST_SET BIT(4) -#define AD7280A_CTRL_LB_THERMISTOR_MSK BIT(3) -#define AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK BIT(2) -#define AD7280A_CTRL_LB_INC_DEV_ADDR_MSK BIT(1) -#define AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK BIT(0) - -#define AD7280A_CELL_OVERVOLTAGE_REG 0xF /* D7 to D0, Read/write */ -#define AD7280A_CELL_UNDERVOLTAGE_REG 0x10 /* D7 to D0, Read/write */ -#define AD7280A_AUX_ADC_OVERVOLTAGE_REG 0x11 /* D7 to D0, Read/write */ -#define AD7280A_AUX_ADC_UNDERVOLTAGE_REG 0x12 /* D7 to D0, Read/write */ - -#define AD7280A_ALERT_REG 0x13 /* D7 to D0, Read/write */ -#define AD7280A_ALERT_REMOVE_MSK GENMASK(3, 0) -#define AD7280A_ALERT_REMOVE_AUX5 BIT(0) -#define AD7280A_ALERT_REMOVE_AUX4_AUX5 BIT(1) -#define AD7280A_ALERT_REMOVE_VIN5 BIT(2) -#define AD7280A_ALERT_REMOVE_VIN4_VIN5 BIT(3) -#define AD7280A_ALERT_GEN_STATIC_HIGH BIT(6) -#define AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN (BIT(7) | BIT(6)) - -#define AD7280A_CELL_BALANCE_REG 0x14 /* D7 to D0, Read/write */ -#define AD7280A_CB1_TIMER_REG 0x15 /* D7 to D0, Read/write */ -#define AD7280A_CB_TIMER_VAL_MSK GENMASK(7, 3) -#define AD7280A_CB2_TIMER_REG 0x16 /* D7 to D0, Read/write */ -#define AD7280A_CB3_TIMER_REG 0x17 /* D7 to D0, Read/write */ -#define AD7280A_CB4_TIMER_REG 0x18 /* D7 to D0, Read/write */ -#define AD7280A_CB5_TIMER_REG 0x19 /* D7 to D0, Read/write */ -#define AD7280A_CB6_TIMER_REG 0x1A /* D7 to D0, Read/write */ -#define AD7280A_PD_TIMER_REG 0x1B /* D7 to D0, Read/write */ -#define AD7280A_READ_REG 0x1C /* D7 to D0, Read/write */ -#define AD7280A_READ_ADDR_MSK GENMASK(7, 2) -#define AD7280A_CNVST_CTRL_REG 0x1D /* D7 to D0, Read/write */ - -/* Transfer fields */ -#define AD7280A_TRANS_WRITE_DEVADDR_MSK GENMASK(31, 27) -#define AD7280A_TRANS_WRITE_ADDR_MSK GENMASK(26, 21) -#define AD7280A_TRANS_WRITE_VAL_MSK GENMASK(20, 13) -#define AD7280A_TRANS_WRITE_ALL_MSK BIT(12) -#define AD7280A_TRANS_WRITE_CRC_MSK GENMASK(10, 3) -#define AD7280A_TRANS_WRITE_RES_PATTERN 0x2 - -/* Layouts differ for channel vs other registers */ -#define AD7280A_TRANS_READ_DEVADDR_MSK GENMASK(31, 27) -#define AD7280A_TRANS_READ_CONV_CHANADDR_MSK GENMASK(26, 23) -#define AD7280A_TRANS_READ_CONV_DATA_MSK GENMASK(22, 11) -#define AD7280A_TRANS_READ_REG_REGADDR_MSK GENMASK(26, 21) -#define AD7280A_TRANS_READ_REG_DATA_MSK GENMASK(20, 13) -#define AD7280A_TRANS_READ_WRITE_ACK_MSK BIT(10) -#define AD7280A_TRANS_READ_CRC_MSK GENMASK(9, 2) - -/* Magic value used to indicate this special case */ -#define AD7280A_ALL_CELLS (0xAD << 16) - -#define AD7280A_MAX_SPI_CLK_HZ 700000 /* < 1MHz */ -#define AD7280A_MAX_CHAIN 8 -#define AD7280A_CELLS_PER_DEV 6 -#define AD7280A_BITS 12 -#define AD7280A_NUM_CH (AD7280A_AUX_ADC_6_REG - \ - AD7280A_CELL_VOLTAGE_1_REG + 1) - -#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \ - (c)) -#define AD7280A_CALC_TEMP_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \ - (c) - AD7280A_CELLS_PER_DEV) - -#define AD7280A_DEVADDR_MASTER 0 -#define AD7280A_DEVADDR_ALL 0x1F - -static const unsigned short ad7280a_n_avg[4] = {1, 2, 4, 8}; -static const unsigned short ad7280a_t_acq_ns[4] = {465, 1010, 1460, 1890}; - -/* 5-bit device address is sent LSB first */ -static unsigned int ad7280a_devaddr(unsigned int addr) -{ - return ((addr & 0x1) << 4) | - ((addr & 0x2) << 2) | - (addr & 0x4) | - ((addr & 0x8) >> 2) | - ((addr & 0x10) >> 4); -} - -/* - * During a read a valid write is mandatory. - * So writing to the highest available address (Address 0x1F) and setting the - * address all parts bit to 0 is recommended. - * So the TXVAL is AD7280A_DEVADDR_ALL + CRC - */ -#define AD7280A_READ_TXVAL 0xF800030A - -/* - * AD7280 CRC - * - * P(x) = x^8 + x^5 + x^3 + x^2 + x^1 + x^0 = 0b100101111 => 0x2F - */ -#define POLYNOM 0x2F - -struct ad7280_state { - struct spi_device *spi; - struct iio_chan_spec *channels; - unsigned int chain_last_alert_ignore; - bool thermistor_term_en; - int slave_num; - int scan_cnt; - int readback_delay_us; - unsigned char crc_tab[CRC8_TABLE_SIZE]; - u8 oversampling_ratio; - u8 acquisition_time; - unsigned char ctrl_lb; - unsigned char cell_threshhigh; - unsigned char cell_threshlow; - unsigned char aux_threshhigh; - unsigned char aux_threshlow; - unsigned char cb_mask[AD7280A_MAX_CHAIN]; - struct mutex lock; /* protect sensor state */ - - __be32 tx ____cacheline_aligned; - __be32 rx; -}; - -static unsigned char ad7280_calc_crc8(unsigned char *crc_tab, unsigned int val) -{ - unsigned char crc; - - crc = crc_tab[val >> 16 & 0xFF]; - crc = crc_tab[crc ^ (val >> 8 & 0xFF)]; - - return crc ^ (val & 0xFF); -} - -static int ad7280_check_crc(struct ad7280_state *st, unsigned int val) -{ - unsigned char crc = ad7280_calc_crc8(st->crc_tab, val >> 10); - - if (crc != ((val >> 2) & 0xFF)) - return -EIO; - - return 0; -} - -/* - * After initiating a conversion sequence we need to wait until the conversion - * is done. The delay is typically in the range of 15..30us however depending on - * the number of devices in the daisy chain, the number of averages taken, - * conversion delays and acquisition time options it may take up to 250us, in - * this case we better sleep instead of busy wait. - */ - -static void ad7280_delay(struct ad7280_state *st) -{ - if (st->readback_delay_us < 50) - udelay(st->readback_delay_us); - else - usleep_range(250, 500); -} - -static int __ad7280_read32(struct ad7280_state *st, unsigned int *val) -{ - int ret; - struct spi_transfer t = { - .tx_buf = &st->tx, - .rx_buf = &st->rx, - .len = sizeof(st->tx), - }; - - st->tx = cpu_to_be32(AD7280A_READ_TXVAL); - - ret = spi_sync_transfer(st->spi, &t, 1); - if (ret) - return ret; - - *val = be32_to_cpu(st->rx); - - return 0; -} - -static int ad7280_write(struct ad7280_state *st, unsigned int devaddr, - unsigned int addr, bool all, unsigned int val) -{ - unsigned int reg = FIELD_PREP(AD7280A_TRANS_WRITE_DEVADDR_MSK, devaddr) | - FIELD_PREP(AD7280A_TRANS_WRITE_ADDR_MSK, addr) | - FIELD_PREP(AD7280A_TRANS_WRITE_VAL_MSK, val) | - FIELD_PREP(AD7280A_TRANS_WRITE_ALL_MSK, all); - - reg |= FIELD_PREP(AD7280A_TRANS_WRITE_CRC_MSK, - ad7280_calc_crc8(st->crc_tab, reg >> 11)); - /* Reserved b010 pattern not included crc calc */ - reg |= AD7280A_TRANS_WRITE_RES_PATTERN; - - st->tx = cpu_to_be32(reg); - - return spi_write(st->spi, &st->tx, sizeof(st->tx)); -} - -static int ad7280_read_reg(struct ad7280_state *st, unsigned int devaddr, - unsigned int addr) -{ - int ret; - unsigned int tmp; - - /* turns off the read operation on all parts */ - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, - FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, - AD7280A_CTRL_HB_CONV_INPUT_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, - AD7280A_CTRL_HB_CONV_RREAD_NO) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, - st->oversampling_ratio)); - if (ret) - return ret; - - /* turns on the read operation on the addressed part */ - ret = ad7280_write(st, devaddr, AD7280A_CTRL_HB_REG, 0, - FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, - AD7280A_CTRL_HB_CONV_INPUT_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, - AD7280A_CTRL_HB_CONV_RREAD_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, - st->oversampling_ratio)); - if (ret) - return ret; - - /* Set register address on the part to be read from */ - ret = ad7280_write(st, devaddr, AD7280A_READ_REG, 0, - FIELD_PREP(AD7280A_READ_ADDR_MSK, addr)); - if (ret) - return ret; - - ret = __ad7280_read32(st, &tmp); - if (ret) - return ret; - - if (ad7280_check_crc(st, tmp)) - return -EIO; - - if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) || - (FIELD_GET(AD7280A_TRANS_READ_REG_REGADDR_MSK, tmp) != addr)) - return -EFAULT; - - return FIELD_GET(AD7280A_TRANS_READ_REG_DATA_MSK, tmp); -} - -static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr, - unsigned int addr) -{ - int ret; - unsigned int tmp; - - ret = ad7280_write(st, devaddr, AD7280A_READ_REG, 0, - FIELD_PREP(AD7280A_READ_ADDR_MSK, addr)); - if (ret) - return ret; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, - FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, - AD7280A_CTRL_HB_CONV_INPUT_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, - AD7280A_CTRL_HB_CONV_RREAD_NO) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, - st->oversampling_ratio)); - if (ret) - return ret; - - ret = ad7280_write(st, devaddr, AD7280A_CTRL_HB_REG, 0, - FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, - AD7280A_CTRL_HB_CONV_INPUT_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, - AD7280A_CTRL_HB_CONV_RREAD_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_START_MSK, - AD7280A_CTRL_HB_CONV_START_CS) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, - st->oversampling_ratio)); - if (ret) - return ret; - - ad7280_delay(st); - - ret = __ad7280_read32(st, &tmp); - if (ret) - return ret; - - if (ad7280_check_crc(st, tmp)) - return -EIO; - - if ((FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, tmp) != devaddr) || - (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) != addr)) - return -EFAULT; - - return FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp); -} - -static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt, - unsigned int *array) -{ - int i, ret; - unsigned int tmp, sum = 0; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ_REG, 1, - AD7280A_CELL_VOLTAGE_1_REG << 2); - if (ret) - return ret; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, - FIELD_PREP(AD7280A_CTRL_HB_CONV_INPUT_MSK, - AD7280A_CTRL_HB_CONV_INPUT_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_RREAD_MSK, - AD7280A_CTRL_HB_CONV_RREAD_ALL) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_START_MSK, - AD7280A_CTRL_HB_CONV_START_CS) | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, - st->oversampling_ratio)); - if (ret) - return ret; - - ad7280_delay(st); - - for (i = 0; i < cnt; i++) { - ret = __ad7280_read32(st, &tmp); - if (ret) - return ret; - - if (ad7280_check_crc(st, tmp)) - return -EIO; - - if (array) - array[i] = tmp; - /* only sum cell voltages */ - if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, tmp) <= - AD7280A_CELL_VOLTAGE_6_REG) - sum += FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, tmp); - } - - return sum; -} - -static void ad7280_sw_power_down(void *data) -{ - struct ad7280_state *st = data; - - ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, - AD7280A_CTRL_HB_PWRDN_SW | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio)); -} - -static int ad7280_chain_setup(struct ad7280_state *st) -{ - unsigned int val, n; - int ret; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_LB_REG, 1, - FIELD_PREP(AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK, 1) | - FIELD_PREP(AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK, 1) | - AD7280A_CTRL_LB_MUST_SET | - FIELD_PREP(AD7280A_CTRL_LB_SWRST_MSK, 1) | - st->ctrl_lb); - if (ret) - return ret; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_LB_REG, 1, - FIELD_PREP(AD7280A_CTRL_LB_DAISY_CHAIN_RB_MSK, 1) | - FIELD_PREP(AD7280A_CTRL_LB_LOCK_DEV_ADDR_MSK, 1) | - AD7280A_CTRL_LB_MUST_SET | - FIELD_PREP(AD7280A_CTRL_LB_SWRST_MSK, 0) | - st->ctrl_lb); - if (ret) - goto error_power_down; - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ_REG, 1, - FIELD_PREP(AD7280A_READ_ADDR_MSK, AD7280A_CTRL_LB_REG)); - if (ret) - goto error_power_down; - - for (n = 0; n <= AD7280A_MAX_CHAIN; n++) { - ret = __ad7280_read32(st, &val); - if (ret) - goto error_power_down; - - if (val == 0) - return n - 1; - - if (ad7280_check_crc(st, val)) { - ret = -EIO; - goto error_power_down; - } - - if (n != ad7280a_devaddr(FIELD_GET(AD7280A_TRANS_READ_DEVADDR_MSK, val))) { - ret = -EIO; - goto error_power_down; - } - } - ret = -EFAULT; - -error_power_down: - ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CTRL_HB_REG, 1, - AD7280A_CTRL_HB_PWRDN_SW | - FIELD_PREP(AD7280A_CTRL_HB_CONV_AVG_MSK, st->oversampling_ratio)); - - return ret; -} - -static ssize_t ad7280_show_balance_sw(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, char *buf) -{ - struct ad7280_state *st = iio_priv(indio_dev); - - return sysfs_emit(buf, "%d\n", - !!(st->cb_mask[chan->address >> 8] & - (1 << ((chan->address & 0xFF) + 2)))); -} - -static ssize_t ad7280_store_balance_sw(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - const char *buf, size_t len) -{ - struct ad7280_state *st = iio_priv(indio_dev); - unsigned int devaddr, ch; - bool readin; - int ret; - - ret = strtobool(buf, &readin); - if (ret) - return ret; - - devaddr = chan->address >> 8; - ch = chan->address & 0xFF; - - mutex_lock(&st->lock); - if (readin) - st->cb_mask[devaddr] |= 1 << (ch + 2); - else - st->cb_mask[devaddr] &= ~(1 << (ch + 2)); - - ret = ad7280_write(st, devaddr, AD7280A_CELL_BALANCE_REG, - 0, st->cb_mask[devaddr]); - mutex_unlock(&st->lock); - - return ret ? ret : len; -} - -static ssize_t ad7280_show_balance_timer(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct ad7280_state *st = iio_priv(indio_dev); - unsigned int msecs; - int ret; - - mutex_lock(&st->lock); - ret = ad7280_read_reg(st, chan->address >> 8, - (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG); - mutex_unlock(&st->lock); - - if (ret < 0) - return ret; - - msecs = FIELD_GET(AD7280A_CB_TIMER_VAL_MSK, ret) * 71500; - - return sysfs_emit(buf, "%u.%u\n", msecs / 1000, msecs % 1000); -} - -static ssize_t ad7280_store_balance_timer(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - const char *buf, size_t len) -{ - struct ad7280_state *st = iio_priv(indio_dev); - int val, val2; - int ret; - - ret = iio_str_to_fixpoint(buf, 1000, &val, &val2); - if (ret) - return ret; - - val = val * 1000 + val2; - val /= 71500; - - if (val > 31) - return -EINVAL; - - mutex_lock(&st->lock); - ret = ad7280_write(st, chan->address >> 8, - (chan->address & 0xFF) + AD7280A_CB1_TIMER_REG, 0, - FIELD_PREP(AD7280A_CB_TIMER_VAL_MSK, val)); - mutex_unlock(&st->lock); - - return ret ? ret : len; -} - -static const struct iio_chan_spec_ext_info ad7280_cell_ext_info[] = { - { - .name = "balance_switch_en", - .read = ad7280_show_balance_sw, - .write = ad7280_store_balance_sw, - .shared = IIO_SEPARATE, - }, { - .name = "balance_switch_timer", - .read = ad7280_show_balance_timer, - .write = ad7280_store_balance_timer, - .shared = IIO_SEPARATE, - }, - {} -}; - -static const struct iio_event_spec ad7280_events[] = { - { - .type = IIO_EV_TYPE_THRESH, - .dir = IIO_EV_DIR_RISING, - .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), - }, { - .type = IIO_EV_TYPE_THRESH, - .dir = IIO_EV_DIR_FALLING, - .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE), - }, -}; - -static void ad7280_voltage_channel_init(struct iio_chan_spec *chan, int i, - bool irq_present) -{ - chan->type = IIO_VOLTAGE; - chan->differential = 1; - chan->channel = i; - chan->channel2 = chan->channel + 1; - if (irq_present) { - chan->event_spec = ad7280_events; - chan->num_event_specs = ARRAY_SIZE(ad7280_events); - } - chan->ext_info = ad7280_cell_ext_info; -} - -static void ad7280_temp_channel_init(struct iio_chan_spec *chan, int i, - bool irq_present) -{ - chan->type = IIO_TEMP; - chan->channel = i; - if (irq_present) { - chan->event_spec = ad7280_events; - chan->num_event_specs = ARRAY_SIZE(ad7280_events); - } -} - -static void ad7280_common_fields_init(struct iio_chan_spec *chan, int addr, - int cnt) -{ - chan->indexed = 1; - chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); - chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); - chan->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO); - chan->address = addr; - chan->scan_index = cnt; - chan->scan_type.sign = 'u'; - chan->scan_type.realbits = 12; - chan->scan_type.storagebits = 32; -} - -static void ad7280_total_voltage_channel_init(struct iio_chan_spec *chan, - int cnt, int dev) -{ - chan->type = IIO_VOLTAGE; - chan->differential = 1; - chan->channel = 0; - chan->channel2 = dev * AD7280A_CELLS_PER_DEV; - chan->address = AD7280A_ALL_CELLS; - chan->indexed = 1; - chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); - chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); - chan->scan_index = cnt; - chan->scan_type.sign = 'u'; - chan->scan_type.realbits = 32; - chan->scan_type.storagebits = 32; -} - -static void ad7280_init_dev_channels(struct ad7280_state *st, int dev, int *cnt, - bool irq_present) -{ - int addr, ch, i; - struct iio_chan_spec *chan; - - for (ch = AD7280A_CELL_VOLTAGE_1_REG; ch <= AD7280A_AUX_ADC_6_REG; ch++) { - chan = &st->channels[*cnt]; - - if (ch < AD7280A_AUX_ADC_1_REG) { - i = AD7280A_CALC_VOLTAGE_CHAN_NUM(dev, ch); - ad7280_voltage_channel_init(chan, i, irq_present); - } else { - i = AD7280A_CALC_TEMP_CHAN_NUM(dev, ch); - ad7280_temp_channel_init(chan, i, irq_present); - } - - addr = ad7280a_devaddr(dev) << 8 | ch; - ad7280_common_fields_init(chan, addr, *cnt); - - (*cnt)++; - } -} - -static int ad7280_channel_init(struct ad7280_state *st, bool irq_present) -{ - int dev, cnt = 0; - - st->channels = devm_kcalloc(&st->spi->dev, (st->slave_num + 1) * 12 + 1, - sizeof(*st->channels), GFP_KERNEL); - if (!st->channels) - return -ENOMEM; - - for (dev = 0; dev <= st->slave_num; dev++) - ad7280_init_dev_channels(st, dev, &cnt, irq_present); - - ad7280_total_voltage_channel_init(&st->channels[cnt], cnt, dev); - - return cnt + 1; -} - -static int ad7280a_read_thresh(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - enum iio_event_type type, - enum iio_event_direction dir, - enum iio_event_info info, int *val, int *val2) -{ - struct ad7280_state *st = iio_priv(indio_dev); - - switch (chan->type) { - case IIO_VOLTAGE: - switch (dir) { - case IIO_EV_DIR_RISING: - *val = 1000 + (st->cell_threshhigh * 1568L) / 100; - return IIO_VAL_INT; - case IIO_EV_DIR_FALLING: - *val = 1000 + (st->cell_threshlow * 1568L) / 100; - return IIO_VAL_INT; - default: - return -EINVAL; - } - break; - case IIO_TEMP: - switch (dir) { - case IIO_EV_DIR_RISING: - *val = ((st->aux_threshhigh) * 196L) / 10; - return IIO_VAL_INT; - case IIO_EV_DIR_FALLING: - *val = (st->aux_threshlow * 196L) / 10; - return IIO_VAL_INT; - default: - return -EINVAL; - } - break; - default: - return -EINVAL; - } -} - -static int ad7280a_write_thresh(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, - enum iio_event_type type, - enum iio_event_direction dir, - enum iio_event_info info, - int val, int val2) -{ - struct ad7280_state *st = iio_priv(indio_dev); - unsigned int addr; - long value; - int ret; - - if (val2 != 0) - return -EINVAL; - - mutex_lock(&st->lock); - switch (chan->type) { - case IIO_VOLTAGE: - value = ((val - 1000) * 100) / 1568; /* LSB 15.68mV */ - value = clamp(value, 0L, 0xFFL); - switch (dir) { - case IIO_EV_DIR_RISING: - addr = AD7280A_CELL_OVERVOLTAGE_REG; - st->cell_threshhigh = value; - break; - case IIO_EV_DIR_FALLING: - addr = AD7280A_CELL_UNDERVOLTAGE_REG; - st->cell_threshlow = value; - break; - default: - ret = -EINVAL; - goto err_unlock; - } - break; - case IIO_TEMP: - value = (val * 10) / 196; /* LSB 19.6mV */ - value = clamp(value, 0L, 0xFFL); - switch (dir) { - case IIO_EV_DIR_RISING: - addr = AD7280A_AUX_ADC_OVERVOLTAGE_REG; - st->aux_threshhigh = val; - break; - case IIO_EV_DIR_FALLING: - addr = AD7280A_AUX_ADC_UNDERVOLTAGE_REG; - st->aux_threshlow = val; - break; - default: - ret = -EINVAL; - goto err_unlock; - } - break; - default: - ret = -EINVAL; - goto err_unlock; - } - - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, addr, 1, val); -err_unlock: - mutex_unlock(&st->lock); - - return ret; -} - -static irqreturn_t ad7280_event_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct ad7280_state *st = iio_priv(indio_dev); - unsigned int *channels; - int i, ret; - - channels = kcalloc(st->scan_cnt, sizeof(*channels), GFP_KERNEL); - if (!channels) - return IRQ_HANDLED; - - ret = ad7280_read_all_channels(st, st->scan_cnt, channels); - if (ret < 0) - goto out; - - for (i = 0; i < st->scan_cnt; i++) { - unsigned int val; - - val = FIELD_GET(AD7280A_TRANS_READ_CONV_DATA_MSK, channels[i]); - if (FIELD_GET(AD7280A_TRANS_READ_CONV_CHANADDR_MSK, channels[i]) - <= AD7280A_CELL_VOLTAGE_6_REG) { - if (val >= st->cell_threshhigh) { - u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0, - IIO_EV_DIR_RISING, - IIO_EV_TYPE_THRESH, - 0, 0, 0); - iio_push_event(indio_dev, tmp, - iio_get_time_ns(indio_dev)); - } else if (val <= st->cell_threshlow) { - u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0, - IIO_EV_DIR_FALLING, - IIO_EV_TYPE_THRESH, - 0, 0, 0); - iio_push_event(indio_dev, tmp, - iio_get_time_ns(indio_dev)); - } - } else { - if (val >= st->aux_threshhigh) { - u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, - IIO_EV_TYPE_THRESH, - IIO_EV_DIR_RISING); - iio_push_event(indio_dev, tmp, - iio_get_time_ns(indio_dev)); - } else if (val <= st->aux_threshlow) { - u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0, - IIO_EV_TYPE_THRESH, - IIO_EV_DIR_FALLING); - iio_push_event(indio_dev, tmp, - iio_get_time_ns(indio_dev)); - } - } - } - -out: - kfree(channels); - - return IRQ_HANDLED; -} - -static void ad7280_update_delay(struct ad7280_state *st) -{ - /* - * Total Conversion Time = ((tACQ + tCONV) * - * (Number of Conversions per Part)) − - * tACQ + ((N - 1) * tDELAY) - * - * Readback Delay = Total Conversion Time + tWAIT - */ - - st->readback_delay_us = - ((ad7280a_t_acq_ns[st->acquisition_time & 0x3] + 695) * - (AD7280A_NUM_CH * ad7280a_n_avg[st->oversampling_ratio & 0x3])) - - ad7280a_t_acq_ns[st->acquisition_time & 0x3] + st->slave_num * 250; - - /* Convert to usecs */ - st->readback_delay_us = DIV_ROUND_UP(st->readback_delay_us, 1000); - st->readback_delay_us += 5; /* Add tWAIT */ -} - -static int ad7280_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad7280_state *st = iio_priv(indio_dev); - int ret; - - switch (m) { - case IIO_CHAN_INFO_RAW: - mutex_lock(&st->lock); - if (chan->address == AD7280A_ALL_CELLS) - ret = ad7280_read_all_channels(st, st->scan_cnt, NULL); - else - ret = ad7280_read_channel(st, chan->address >> 8, - chan->address & 0xFF); - mutex_unlock(&st->lock); - - if (ret < 0) - return ret; - - *val = ret; - - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - if ((chan->address & 0xFF) <= AD7280A_CELL_VOLTAGE_6_REG) - *val = 4000; - else - *val = 5000; - - *val2 = AD7280A_BITS; - return IIO_VAL_FRACTIONAL_LOG2; - case IIO_CHAN_INFO_OVERSAMPLING_RATIO: - *val = ad7280a_n_avg[st->oversampling_ratio]; - return IIO_VAL_INT; - } - return -EINVAL; -} - -static int ad7280_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, int val2, long mask) -{ - struct ad7280_state *st = iio_priv(indio_dev); - int i; - - switch (mask) { - case IIO_CHAN_INFO_OVERSAMPLING_RATIO: - if (val2 != 0) - return -EINVAL; - for (i = 0; i < ARRAY_SIZE(ad7280a_n_avg); i++) { - if (val == ad7280a_n_avg[i]) { - st->oversampling_ratio = i; - ad7280_update_delay(st); - return 0; - } - } - return -EINVAL; - default: - return -EINVAL; - } -} - -static const struct iio_info ad7280_info = { - .read_raw = ad7280_read_raw, - .write_raw = ad7280_write_raw, - .read_event_value = &ad7280a_read_thresh, - .write_event_value = &ad7280a_write_thresh, -}; - -static const struct iio_info ad7280_info_no_irq = { - .read_event_value = &ad7280a_read_thresh, - .write_event_value = &ad7280a_write_thresh, -}; - -static int ad7280_probe(struct spi_device *spi) -{ - struct device *dev = &spi->dev; - struct ad7280_state *st; - int ret; - struct iio_dev *indio_dev; - - indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); - if (!indio_dev) - return -ENOMEM; - - st = iio_priv(indio_dev); - spi_set_drvdata(spi, indio_dev); - st->spi = spi; - mutex_init(&st->lock); - - st->thermistor_term_en = - device_property_read_bool(dev, "adi,thermistor-termination"); - - if (device_property_present(dev, "adi,acquistion-time-ns")) { - u32 val; - - ret = device_property_read_u32(dev, "adi,acquisition-time-ns", &val); - if (ret) - return ret; - - switch (val) { - case 400: - st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns; - break; - case 800: - st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_800ns; - break; - case 1200: - st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1200ns; - break; - case 1600: - st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_1600ns; - break; - default: - dev_err(dev, "Firmware provided acquisition time is invalid\n"); - return -EINVAL; - } - } else { - st->acquisition_time = AD7280A_CTRL_LB_ACQ_TIME_400ns; - } - - /* Alert masks are intended for when particular inputs are not wired up */ - if (device_property_present(dev, "adi,voltage-alert-last-chan")) { - u8 val; - - ret = device_property_read_u8(dev, "adi,voltage-alert-last-chan", &val); - if (ret) - return ret; - - switch (val) { - case 3: - st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN4_VIN5; - break; - case 4: - st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_VIN5; - break; - case 5: - break; - default: - dev_err(dev, - "Firmware provided last voltage alert channel invalid\n"); - break; - } - } - if (device_property_present(dev, "adi,temp-alert-last-chan")) { - u8 val; - - ret = device_property_read_u8(dev, "adi,temp-alert-last-chan", &val); - if (ret) - return ret; - - switch (val) { - case 3: - st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_AUX4_AUX5; - break; - case 4: - st->chain_last_alert_ignore |= AD7280A_ALERT_REMOVE_AUX5; - break; - case 5: - break; - default: - dev_err(dev, - "Firmware provided last temp alert channel invalid\n"); - break; - } - } - crc8_populate_msb(st->crc_tab, POLYNOM); - - st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ; - st->spi->mode = SPI_MODE_1; - spi_setup(st->spi); - - st->ctrl_lb = FIELD_PREP(AD7280A_CTRL_LB_ACQ_TIME_MSK, st->acquisition_time) | - FIELD_PREP(AD7280A_CTRL_LB_THERMISTOR_MSK, st->thermistor_term_en); - st->oversampling_ratio = 0; /* No oversampling */ - - ret = ad7280_chain_setup(st); - if (ret < 0) - return ret; - - st->slave_num = ret; - st->scan_cnt = (st->slave_num + 1) * AD7280A_NUM_CH; - st->cell_threshhigh = 0xFF; - st->aux_threshhigh = 0xFF; - - ret = devm_add_action_or_reset(dev, ad7280_sw_power_down, st); - if (ret) - return ret; - - ad7280_update_delay(st); - - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->modes = INDIO_DIRECT_MODE; - - ret = ad7280_channel_init(st, spi->irq > 0); - if (ret < 0) - return ret; - - indio_dev->num_channels = ret; - indio_dev->channels = st->channels; - if (spi->irq > 0) { - ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, - AD7280A_ALERT_REG, 1, - AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN); - if (ret) - return ret; - - ret = ad7280_write(st, ad7280a_devaddr(st->slave_num), - AD7280A_ALERT_REG, 0, - AD7280A_ALERT_GEN_STATIC_HIGH | - FIELD_PREP(AD7280A_ALERT_REMOVE_MSK, - st->chain_last_alert_ignore)); - if (ret) - return ret; - - ret = devm_request_threaded_irq(dev, spi->irq, - NULL, - ad7280_event_handler, - IRQF_TRIGGER_FALLING | - IRQF_ONESHOT, - indio_dev->name, - indio_dev); - if (ret) - return ret; - - indio_dev->info = &ad7280_info; - } else { - indio_dev->info = &ad7280_info_no_irq; - } - - return devm_iio_device_register(dev, indio_dev); -} - -static const struct spi_device_id ad7280_id[] = { - {"ad7280a", 0}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad7280_id); - -static struct spi_driver ad7280_driver = { - .driver = { - .name = "ad7280", - }, - .probe = ad7280_probe, - .id_table = ad7280_id, -}; -module_spi_driver(ad7280_driver); - -MODULE_AUTHOR("Michael Hennerich "); -MODULE_DESCRIPTION("Analog Devices AD7280A"); -MODULE_LICENSE("GPL v2");