From patchwork Tue Sep 25 03:17:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Qiang X-Patchwork-Id: 10613279 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 006C0112B for ; Tue, 25 Sep 2018 03:17:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7B3529AF9 for ; Tue, 25 Sep 2018 03:17:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DBD7529B0C; Tue, 25 Sep 2018 03:17:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 79B8929AF9 for ; Tue, 25 Sep 2018 03:17:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728199AbeIYJXD (ORCPT ); Tue, 25 Sep 2018 05:23:03 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:35402 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727503AbeIYJXC (ORCPT ); Tue, 25 Sep 2018 05:23:02 -0400 Received: by mail-pf1-f196.google.com with SMTP id p12-v6so10194978pfh.2; Mon, 24 Sep 2018 20:17:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=eN08oazTHCUlPOw905mO5wO0diJoN7wEkfr+VnBaEfc=; b=TYwbI64PH6FJkoIDab3+/ILZEyFL6j9JSkMjIV9076XXsbcp7PjHy270knpWriIBy8 IBIrfNfIxG1K+f3yI/zEfza5Mac+XVd5KWBaBCE+lY6ddkTJTYGhXvhDEZ8Q4Ao9G+DZ iZV2hEb54eM+DaixpXsuaZ8ShCA1+K4oLyZeOnz25jXxm2LDc/a2RBaSXaDz/yNtCzrn +4ehpsQF4KoX7WtdZB6s44z7nHJw4S0dfz022GrhJbFXvn4RHD3H+p+OCFxhvL8bqRQh 8HU0c87dbnt4OlheFbqLDCDtJdY64ILFPTPnMayujPaduzK/Zdtg1jPf8LXPHGDbTQFO ypQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=eN08oazTHCUlPOw905mO5wO0diJoN7wEkfr+VnBaEfc=; b=jv2vBib6SZBPGtc6dcvMDN8IJVw7ZqJNUkXnmYSXsw5fdfj5vfran0gdzjBvj4i0bN 999RnX/3gVGaiis3epOXjtO4vRRoUB1oSVaIxyAmbB5oy+znTMjaI9FHA4rWieo7eWYi oUeP8XA1TjIF70+ptL9V/kuHgUREyNmkWJq3NMq5dVz3Q7rhRE/6gENv3KCX0Xq0lCJ9 /B/9O0pQz8IUPsmCXOoFoYbvenM/JhqqLzJivLG7TQ71buomtrgy3Vz6dwpUifxTrfOg s8eDHGjGq8Qgd5al6Fh6LKZhmZDyYg9jfem7f6cEf6o8holIKdAYJZPDaCzO3j/SrYM1 9ppg== X-Gm-Message-State: ABuFfog3Lsv0CFe58vxYG8uQcbVZM32uOxP1Ct+fvyrNW4tcAINWMKWo MsxalvcXFQmQxRqfZn52jmw= X-Google-Smtp-Source: ACcGV61aRIGV6l49vzlm2m+aQpPUi35B42NainRkp/SX6mkOvpJhmdvRXc7FqyzKvf3BELpWhEWX8w== X-Received: by 2002:a17:902:c8:: with SMTP id a66-v6mr1428289pla.269.1537845458721; Mon, 24 Sep 2018 20:17:38 -0700 (PDT) Received: from localhost (104.176.229.35.bc.googleusercontent.com. [35.229.176.104]) by smtp.gmail.com with ESMTPSA id t26-v6sm829172pfm.138.2018.09.24.20.17.37 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 24 Sep 2018 20:17:38 -0700 (PDT) From: Song Qiang To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, robh+dt@kernel.org, mark.rutland@arm.com Cc: preid@electromag.com.au, rtresidd@electromag.com.au, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Song Qiang Subject: [PATCH 2/2] iio: magnetometer: Add driver support for PNI RM3100 Date: Tue, 25 Sep 2018 11:17:24 +0800 Message-Id: <20180925031724.21399-2-songqiang1304521@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180925031724.21399-1-songqiang1304521@gmail.com> References: <20180925031724.21399-1-songqiang1304521@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP PNI RM3100 is a high resolution, large signal immunity magnetometer, composed of 3 single sensors and a processing chip with MagI2C Interface. Following functions are available: - Single-shot measurement from /sys/bus/iio/devices/iio:deviceX/in_magn_{axis}_raw - Triggerd buffer measurement. - Both i2c and spi interface are supported. - Both interrupt and polling measurement is supported, depands on if the 'interrupts' in DT is declared. Signed-off-by: Song Qiang --- Changes in v2: - Add scale channel. - Add EXPORT_SYMBOL_GPL() to export regmap confuguration structures. - Add sampling frequency available attribute. - Clean up headers and License declarations. - Change axis number to 3. - Remove bus specific part in compatible string. - Remove le32_to_cpu(). - Check cycle count registers at *_probe(). - Format comments. - Spell check. - Change prefix from RM_* to RM3100_*. - Check all error return paths. - Add devm_add_action() to avoid race condition when remove. MAINTAINERS | 7 + drivers/iio/magnetometer/Kconfig | 29 ++ drivers/iio/magnetometer/Makefile | 4 + drivers/iio/magnetometer/rm3100-core.c | 470 +++++++++++++++++++++++++ drivers/iio/magnetometer/rm3100-i2c.c | 58 +++ drivers/iio/magnetometer/rm3100-spi.c | 64 ++++ drivers/iio/magnetometer/rm3100.h | 73 ++++ 7 files changed, 705 insertions(+) create mode 100644 drivers/iio/magnetometer/rm3100-core.c create mode 100644 drivers/iio/magnetometer/rm3100-i2c.c create mode 100644 drivers/iio/magnetometer/rm3100-spi.c create mode 100644 drivers/iio/magnetometer/rm3100.h diff --git a/MAINTAINERS b/MAINTAINERS index 967ce8cdd1cc..14eeeb072403 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11393,6 +11393,13 @@ M: "Rafael J. Wysocki" S: Maintained F: drivers/pnp/ +PNI RM3100 IIO DRIVER +M: Song Qiang +L: linux-iio@vger.kernel.org +S: Maintained +F: drivers/iio/magnetometer/rm3100* +F: Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt + POSIX CLOCKS and TIMERS M: Thomas Gleixner L: linux-kernel@vger.kernel.org diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index ed9d776d01af..f130b866a4fc 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -175,4 +175,33 @@ config SENSORS_HMC5843_SPI - hmc5843_core (core functions) - hmc5843_spi (support for HMC5983) +config SENSORS_RM3100 + tristate + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + +config SENSORS_RM3100_I2C + tristate "PNI RM3100 9-Axis Magnetometer (I2C)" + depends on I2C + select SENSORS_RM3100 + select REGMAP_I2C + help + Say Y here to add support for the PNI RM3100 9-Axis Magnetometer. + + This driver can also be compiled as a module. + To compile this driver as a module, choose M here: the module + will be called rm3100-i2c. + +config SENSORS_RM3100_SPI + tristate "PNI RM3100 9-Axis Magnetometer (SPI)" + depends on SPI_MASTER + select SENSORS_RM3100 + select REGMAP_SPI + help + Say Y here to add support for the PNI RM3100 9-Axis Magnetometer. + + This driver can also be compiled as a module. + To compile this driver as a module, choose M here: the module + will be called rm3100-spi. + endmenu diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile index 664b2f866472..ba1bc34b82fa 100644 --- a/drivers/iio/magnetometer/Makefile +++ b/drivers/iio/magnetometer/Makefile @@ -24,3 +24,7 @@ obj-$(CONFIG_IIO_ST_MAGN_SPI_3AXIS) += st_magn_spi.o obj-$(CONFIG_SENSORS_HMC5843) += hmc5843_core.o obj-$(CONFIG_SENSORS_HMC5843_I2C) += hmc5843_i2c.o obj-$(CONFIG_SENSORS_HMC5843_SPI) += hmc5843_spi.o + +obj-$(CONFIG_SENSORS_RM3100) += rm3100-core.o +obj-$(CONFIG_SENSORS_RM3100_I2C) += rm3100-i2c.o +obj-$(CONFIG_SENSORS_RM3100_SPI) += rm3100-spi.o diff --git a/drivers/iio/magnetometer/rm3100-core.c b/drivers/iio/magnetometer/rm3100-core.c new file mode 100644 index 000000000000..5d28b53b7a04 --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-core.c @@ -0,0 +1,470 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PNI RM3100 3-axis geomagnetic sensor driver core. + * + * Copyright (C) 2018 Song Qiang + * + * User Manual available at + * + * + * TODO: event generaton, pm. + */ + +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "rm3100.h" + +static const struct regmap_range rm3100_readable_ranges[] = { + regmap_reg_range(RM3100_W_REG_START, RM3100_W_REG_END), +}; + +const struct regmap_access_table rm3100_readable_table = { + .yes_ranges = rm3100_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_readable_ranges), +}; +EXPORT_SYMBOL_GPL(rm3100_readable_table); + +static const struct regmap_range rm3100_writable_ranges[] = { + regmap_reg_range(RM3100_R_REG_START, RM3100_R_REG_END), +}; + +const struct regmap_access_table rm3100_writable_table = { + .yes_ranges = rm3100_writable_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_writable_ranges), +}; +EXPORT_SYMBOL_GPL(rm3100_writable_table); + +static const struct regmap_range rm3100_volatile_ranges[] = { + regmap_reg_range(RM3100_V_REG_START, RM3100_V_REG_END), +}; + +const struct regmap_access_table rm3100_volatile_table = { + .yes_ranges = rm3100_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(rm3100_volatile_ranges), +}; +EXPORT_SYMBOL_GPL(rm3100_volatile_table); + +static irqreturn_t rm3100_irq_handler(int irq, void *d) +{ + struct rm3100_data *data = d; + + complete(&data->measuring_done); + + return IRQ_HANDLED; +} + +static int rm3100_wait_measurement(struct rm3100_data *data) +{ + struct regmap *regmap = data->regmap; + unsigned int val; + int tries = 20; + int ret; + + /* + * A read cycle of 400kbits i2c; bus is about 20us, plus the time + * used for scheduling, a read cycle of fast mode of this device + * can reach 1.7ms, it may be possible for data to arrive just + * after we check the RM3100_REG_STATUS. In this case, irq_handler is + * called before measuring_done is reinitialized, it will wait + * forever for data that has already been ready. + * Reinitialize measuring_done before looking up makes sure we + * will always capture interrupt no matter when it happened. + */ + if (data->use_interrupt) + reinit_completion(&data->measuring_done); + + ret = regmap_read(regmap, RM3100_REG_STATUS, &val); + if (ret < 0) + return ret; + + if ((val & RM3100_STATUS_DRDY) != RM3100_STATUS_DRDY) { + if (data->use_interrupt) { + ret = wait_for_completion_timeout(&data->measuring_done, + msecs_to_jiffies(data->conversion_time)); + if (ret < 0) + return -ETIMEDOUT; + } else { + do { + usleep_range(1000, 5000); + + ret = regmap_read(regmap, RM3100_REG_STATUS, + &val); + if (ret < 0) + return ret; + + if (val & RM3100_STATUS_DRDY) + break; + } while (--tries); + if (!tries) + return -ETIMEDOUT; + } + } + return 0; +} + +static int rm3100_read_mag(struct rm3100_data *data, int idx, int *val) +{ + struct regmap *regmap = data->regmap; + u8 buffer[3]; + int ret; + + mutex_lock(&data->lock); + ret = rm3100_wait_measurement(data); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } + + ret = regmap_bulk_read(regmap, RM3100_REG_MX2 + 3 * idx, buffer, 3); + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + + *val = sign_extend32((buffer[0] << 16) | (buffer[1] << 8) | buffer[2], + 23); + + return IIO_VAL_INT; +} + +#define RM3100_CHANNEL(axis, idx) \ + { \ + .type = IIO_MAGN, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = idx, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 24, \ + .storagebits = 32, \ + .shift = 8, \ + .endianness = IIO_LE, \ + }, \ + } + +static const struct iio_chan_spec rm3100_channels[] = { + RM3100_CHANNEL(X, 0), + RM3100_CHANNEL(Y, 1), + RM3100_CHANNEL(Z, 2), + IIO_CHAN_SOFT_TIMESTAMP(3), +}; + +static const unsigned long rm3100_scan_masks[] = {GENMASK(2, 0), 0}; + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( + "600 300 150 75 37 18 9 4.5 2.3 1.2 0.6 0.3 0.015 0.075" +); + +static struct attribute *rm3100_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group rm3100_attribute_group = { + .attrs = rm3100_attributes, +}; + +#define RM3100_SAMP_NUM 14 + +/* + * Frequency : rm3100_samp_rates[][0].rm3100_samp_rates[][1]Hz. + * Time between reading: rm3100_sam_rates[][2]ms. + * The first one is actually 1.7ms. + */ +static const int rm3100_samp_rates[RM3100_SAMP_NUM][3] = { + {600, 0, 2}, {300, 0, 3}, {150, 0, 7}, {75, 0, 13}, {37, 0, 27}, + {18, 0, 55}, {9, 0, 110}, {4, 500000, 220}, {2, 300000, 440}, + {1, 200000, 800}, {0, 600000, 1600}, {0, 300000, 3300}, + {0, 15000, 6700}, {0, 75000, 13000} +}; + +static int rm3100_get_samp_freq(struct rm3100_data *data, int *val, int *val2) +{ + int ret; + int tmp; + + mutex_lock(&data->lock); + ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp); + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + *val = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][0]; + *val2 = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][1]; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int rm3100_set_cycle_count(struct rm3100_data *data, int val) +{ + int ret; + u8 i; + + for (i = 0; i < 3; i++) { + ret = regmap_write(data->regmap, RM3100_REG_CC_X + 2 * i, 100); + if (ret < 0) + return ret; + } + if (val == 50) + data->cycle_count_index = 0; + else if (val == 100) + data->cycle_count_index = 1; + else + data->cycle_count_index = 2; + + return 0; +} + +static int rm3100_set_samp_freq(struct rm3100_data *data, int val, int val2) +{ + struct regmap *regmap = data->regmap; + int cycle_count; + int ret; + int i; + + mutex_lock(&data->lock); + /* All cycle count registers use the same value. */ + ret = regmap_read(regmap, RM3100_REG_CC_X, &cycle_count); + if (ret < 0) + goto unlock_return; + + for (i = 0; i < RM3100_SAMP_NUM; i++) { + if (val == rm3100_samp_rates[i][0] && + val2 == rm3100_samp_rates[i][1]) + break; + } + if (i == RM3100_SAMP_NUM) { + ret = -EINVAL; + goto unlock_return; + } + + ret = regmap_write(regmap, RM3100_REG_TMRC, i + RM3100_TMRC_OFFSET); + if (ret < 0) + goto unlock_return; + + /* Checking if cycle count registers need changing. */ + if (val == 600 && cycle_count == 200) { + ret = rm3100_set_cycle_count(data, 100); + if (ret < 0) + goto unlock_return; + } else if (val != 600 && cycle_count == 100) { + ret = rm3100_set_cycle_count(data, 200); + if (ret < 0) + goto unlock_return; + } + + /* Writing TMRC registers requires CMM reset. */ + ret = regmap_write(regmap, RM3100_REG_CMM, 0); + if (ret < 0) + goto unlock_return; + ret = regmap_write(regmap, RM3100_REG_CMM, + RM3100_CMM_X | RM3100_CMM_Y | RM3100_CMM_Z | RM3100_CMM_START); + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + + data->conversion_time = rm3100_samp_rates[i][2] + 3000; + return 0; + +unlock_return: + mutex_unlock(&data->lock); + return ret; +} + +/* + * Scale of this sensor depends on cycle count value, these three values + * are corresponding to cycle count value 50, 100, 200. + * scale = output / gain * 10e4. + */ +const static int rm3100_scale[] = {500, 263, 133}; + +static int rm3100_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int *val, int *val2, long mask) +{ + struct rm3100_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret < 0) { + iio_device_release_direct_mode(indio_dev); + return ret; + } + ret = rm3100_read_mag(data, chan->scan_index, val); + iio_device_release_direct_mode(indio_dev); + + return ret; + case IIO_CHAN_INFO_SCALE: + *val = 0; + *val2 = rm3100_scale[data->cycle_count_index]; + + return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_SAMP_FREQ: + return rm3100_get_samp_freq(data, val, val2); + default: + return -EINVAL; + } +} + +static int rm3100_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct rm3100_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + return rm3100_set_samp_freq(data, val, val2); + default: + return -EINVAL; + } + +} + +static const struct iio_info rm3100_info = { + .attrs = &rm3100_attribute_group, + .read_raw = rm3100_read_raw, + .write_raw = rm3100_write_raw, +}; + +static irqreturn_t rm3100_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct rm3100_data *data = iio_priv(indio_dev); + struct regmap *regmap = data->regmap; + u8 buffer[9]; + int ret; + int i; + + mutex_lock(&data->lock); + ret = rm3100_wait_measurement(data); + if (ret < 0) { + mutex_unlock(&data->lock); + goto done; + } + + ret = regmap_bulk_read(regmap, RM3100_REG_MX2, buffer, sizeof(buffer)); + mutex_unlock(&data->lock); + if (ret < 0) + goto done; + + /* Convert XXXYYYZZZxxx to XXXxYYYxZZZx. x for padding. */ + for (i = 0; i < 3; i++) + memcpy(data->buffer + i * 4, buffer + i * 3, 3); + + iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, + iio_get_time_ns(indio_dev)); + +done: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static void rm3100_remove(void *dh) +{ + struct rm3100_data *data = (struct rm3100_data *)dh; + int ret; + + ret = regmap_write(data->regmap, RM3100_REG_CMM, 0x00); + if (ret < 0) + dev_err(data->dev, "failed to stop device.\n"); +} + +int rm3100_common_probe(struct device *dev, struct regmap *regmap, int irq) +{ + struct iio_dev *indio_dev; + struct rm3100_data *data; + int tmp; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->dev = dev; + data->regmap = regmap; + data->buffer = devm_kzalloc(dev, RM3100_SCAN_BYTES, GFP_KERNEL); + if (!data->buffer) + return -ENOMEM; + + mutex_init(&data->lock); + + indio_dev->dev.parent = dev; + indio_dev->name = "rm3100"; + indio_dev->info = &rm3100_info; + indio_dev->channels = rm3100_channels; + indio_dev->num_channels = ARRAY_SIZE(rm3100_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->available_scan_masks = rm3100_scan_masks; + + if (!irq) + data->use_interrupt = false; + else { + data->use_interrupt = true; + ret = devm_request_irq(dev, + irq, + rm3100_irq_handler, + IRQF_TRIGGER_RISING, + indio_dev->name, + data); + if (ret < 0) { + dev_err(dev, "request irq line failed.\n"); + return ret; + } + init_completion(&data->measuring_done); + } + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, + rm3100_trigger_handler, NULL); + if (ret < 0) + return ret; + + /* 3sec more wait time. */ + ret = regmap_read(regmap, RM3100_REG_TMRC, &tmp); + if (ret < 0) + return ret; + data->conversion_time = + rm3100_samp_rates[tmp-RM3100_TMRC_OFFSET][2] + 3000; + + /* Cycle count values may not be what we want. */ + ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp); + if (ret < 0) + return ret; + if ((tmp - RM3100_TMRC_OFFSET) == 0) + rm3100_set_cycle_count(data, 100); + else + rm3100_set_cycle_count(data, 200); + + /* Starting all channels' conversion. */ + ret = regmap_write(regmap, RM3100_REG_CMM, + RM3100_CMM_X | RM3100_CMM_Y | RM3100_CMM_Z | RM3100_CMM_START); + if (ret < 0) + return ret; + + ret = devm_iio_device_register(dev, indio_dev); + if (ret < 0) + return ret; + + return devm_add_action(dev, rm3100_remove, data); +} +EXPORT_SYMBOL_GPL(rm3100_common_probe); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100-i2c.c b/drivers/iio/magnetometer/rm3100-i2c.c new file mode 100644 index 000000000000..e8b84fac771b --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-i2c.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for PNI RM3100 3-axis geomagnetic sensor a i2c bus. + * + * Copyright (C) 2018 Song Qiang + * + * i2c slave address 0x20 + SA1 << 1 + SA0. + */ + +#include +#include + +#include "rm3100.h" + +static const struct regmap_config rm3100_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .rd_table = &rm3100_readable_table, + .wr_table = &rm3100_writable_table, + .volatile_table = &rm3100_volatile_table, + + .cache_type = REGCACHE_RBTREE, +}; + +static int rm3100_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_I2C_BLOCK | I2C_FUNC_SMBUS_BYTE_DATA)) + return -EOPNOTSUPP; + + regmap = devm_regmap_init_i2c(client, &rm3100_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return rm3100_common_probe(&client->dev, regmap, client->irq); +} + +static const struct of_device_id rm3100_dt_match[] = { + { .compatible = "pni,rm3100", }, + { } +}; +MODULE_DEVICE_TABLE(of, rm3100_dt_match); + +static struct i2c_driver rm3100_driver = { + .driver = { + .name = "rm3100-i2c", + .of_match_table = rm3100_dt_match, + }, + .probe_new = rm3100_probe, +}; +module_i2c_driver(rm3100_driver); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100-spi.c b/drivers/iio/magnetometer/rm3100-spi.c new file mode 100644 index 000000000000..1a7a69fb9872 --- /dev/null +++ b/drivers/iio/magnetometer/rm3100-spi.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for PNI RM3100 3-axis geomagnetic sensor a spi bus. + * + * Copyright (C) 2018 Song Qiang + */ + +#include +#include + +#include "rm3100.h" + +static const struct regmap_config rm3100_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .rd_table = &rm3100_readable_table, + .wr_table = &rm3100_writable_table, + .volatile_table = &rm3100_volatile_table, + + .read_flag_mask = 0x80, + + .cache_type = REGCACHE_RBTREE, +}; + +static int rm3100_probe(struct spi_device *spi) +{ + struct regmap *regmap; + int ret; + + /* Actually this device supports both mode 0 and mode 3. */ + spi->mode = SPI_MODE_0; + /* Data rates cannot exceed 1Mbits. */ + spi->max_speed_hz = 1000000; + spi->bits_per_word = 8; + ret = spi_setup(spi); + if (ret) + return ret; + + regmap = devm_regmap_init_spi(spi, &rm3100_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + return rm3100_common_probe(&spi->dev, regmap, spi->irq); +} + +static const struct of_device_id rm3100_dt_match[] = { + { .compatible = "pni,rm3100", }, + { } +}; +MODULE_DEVICE_TABLE(of, rm3100_dt_match); + +static struct spi_driver rm3100_driver = { + .driver = { + .name = "rm3100-spi", + .of_match_table = rm3100_dt_match, + }, + .probe = rm3100_probe, +}; +module_spi_driver(rm3100_driver); + +MODULE_AUTHOR("Song Qiang "); +MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer spi driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/magnetometer/rm3100.h b/drivers/iio/magnetometer/rm3100.h new file mode 100644 index 000000000000..673647574add --- /dev/null +++ b/drivers/iio/magnetometer/rm3100.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Header file for PNI RM3100 driver + * + * Copyright (C) 2018 Song Qiang + */ + +#ifndef RM3100_CORE_H +#define RM3100_CORE_H + +#include + +#define RM3100_REG_REV_ID 0x36 + +/* Cycle Count Registers. */ +#define RM3100_REG_CC_X 0x05 +#define RM3100_REG_CC_Y 0x07 +#define RM3100_REG_CC_Z 0x09 + +/* Continues Measurement Mode register. */ +#define RM3100_REG_CMM 0x01 +#define RM3100_CMM_START BIT(0) +#define RM3100_CMM_X BIT(4) +#define RM3100_CMM_Y BIT(5) +#define RM3100_CMM_Z BIT(6) + +/* TiMe Rate Configuration register. */ +#define RM3100_REG_TMRC 0x0B +#define RM3100_TMRC_OFFSET 0x92 + +/* Result Status register. */ +#define RM3100_REG_STATUS 0x34 +#define RM3100_STATUS_DRDY BIT(7) + +/* Measurement result registers. */ +#define RM3100_REG_MX2 0x24 +#define RM3100_REG_MY2 0x27 +#define RM3100_REG_MZ2 0x2a + +#define RM3100_W_REG_START RM3100_REG_CMM +#define RM3100_W_REG_END RM3100_REG_REV_ID +#define RM3100_R_REG_START RM3100_REG_CMM +#define RM3100_R_REG_END RM3100_REG_STATUS +#define RM3100_V_REG_START RM3100_REG_MX2 +#define RM3100_V_REG_END RM3100_REG_STATUS + +#define RM3100_SCAN_BYTES 24 + +struct rm3100_data { + struct device *dev; + struct regmap *regmap; + struct completion measuring_done; + bool use_interrupt; + + int conversion_time; + int cycle_count_index; + + u8 *buffer; + + /* + * To protect consistency of every measurement and sampling + * frequency change operations. + */ + struct mutex lock; +}; + +extern const struct regmap_access_table rm3100_readable_table; +extern const struct regmap_access_table rm3100_writable_table; +extern const struct regmap_access_table rm3100_volatile_table; + +int rm3100_common_probe(struct device *dev, struct regmap *regmap, int irq); + +#endif /* RM3100_CORE_H */