From patchwork Sun Apr 12 22:42:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Heiko_St=C3=BCbner?= X-Patchwork-Id: 11485423 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CE7C892C for ; Mon, 13 Apr 2020 10:38:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8E2120737 for ; Mon, 13 Apr 2020 10:38:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727952AbgDMKiD (ORCPT ); Mon, 13 Apr 2020 06:38:03 -0400 Received: from gloria.sntech.de ([185.11.138.130]:57546 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727776AbgDMKiC (ORCPT ); Mon, 13 Apr 2020 06:38:02 -0400 Received: from ip5f5aa64a.dynamic.kabel-deutschland.de ([95.90.166.74] helo=phil.lan) by gloria.sntech.de with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jNlJh-0006wK-EU; Mon, 13 Apr 2020 00:43:05 +0200 From: Heiko Stuebner To: jic23@kernel.org Cc: knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, heiko@sntech.de, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, xxm@rock-chips.com, kever.yang@rock-chips.com, Heiko Stuebner Subject: [PATCH v3] iio: adc: rockchip_saradc: Add support iio buffers Date: Mon, 13 Apr 2020 00:42:51 +0200 Message-Id: <20200412224251.2919182-1-heiko@sntech.de> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Simon Xue Add the ability to also support access via (triggered) buffers next to the existing direct mode. Device in question is the Odroid Go Advance that connects a joystick to two of the saradc channels for X and Y axis and the new (and still pending) adc joystick driver of course wants to use triggered buffers from the iio subsystem. Signed-off-by: Simon Xue [some simplifications and added commit description] Signed-off-by: Heiko Stuebner --- changes in v3: - split buffer struct into values and timestamp area similar to dln2-adc and make sure timestamp gets 8-byte aligned - ALIGN uses 4 as it aligns u16 elements not bytes - hopefully I got it right this time ;-) changes in v2: - use devm_iio_triggered_buffer_setup - calculate data array size from channel number (curtesy of at91-sama5d2_adc) drivers/iio/adc/Kconfig | 2 + drivers/iio/adc/rockchip_saradc.c | 146 ++++++++++++++++++++++-------- 2 files changed, 112 insertions(+), 36 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 12bb8b7ca1ff..8d2dd60614c6 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -809,6 +809,8 @@ config ROCKCHIP_SARADC tristate "Rockchip SARADC driver" depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST) depends on RESET_CONTROLLER + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER help Say yes here to build support for the SARADC found in SoCs from Rockchip. diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index 582ba047c4a6..0713363a4b43 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -15,7 +15,11 @@ #include #include #include +#include #include +#include +#include +#include #define SARADC_DATA 0x00 @@ -32,9 +36,12 @@ #define SARADC_DLY_PU_SOC_MASK 0x3f #define SARADC_TIMEOUT msecs_to_jiffies(100) +#define SARADC_MAX_CHANNELS 6 + +/* buffer elements are u16, timestamp needs to be 8-byte aligned */ +#define SARADC_BUFFER_NUM_U16 ALIGN(SARADC_MAX_CHANNELS, 4) struct rockchip_saradc_data { - int num_bits; const struct iio_chan_spec *channels; int num_channels; unsigned long clk_rate; @@ -49,8 +56,37 @@ struct rockchip_saradc { struct reset_control *reset; const struct rockchip_saradc_data *data; u16 last_val; + const struct iio_chan_spec *last_chan; }; +static void rockchip_saradc_power_down(struct rockchip_saradc *info) +{ + /* Clear irq & power down adc */ + writel_relaxed(0, info->regs + SARADC_CTRL); +} + +static int rockchip_saradc_conversion(struct rockchip_saradc *info, + struct iio_chan_spec const *chan) +{ + reinit_completion(&info->completion); + + /* 8 clock periods as delay between power up and start cmd */ + writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC); + + info->last_chan = chan; + + /* Select the channel to be used and trigger conversion */ + writel(SARADC_CTRL_POWER_CTRL + | (chan->channel & SARADC_CTRL_CHN_MASK) + | SARADC_CTRL_IRQ_ENABLE, + info->regs + SARADC_CTRL); + + if (!wait_for_completion_timeout(&info->completion, SARADC_TIMEOUT)) + return -ETIMEDOUT; + + return 0; +} + static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -62,24 +98,12 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_RAW: mutex_lock(&indio_dev->mlock); - reinit_completion(&info->completion); - - /* 8 clock periods as delay between power up and start cmd */ - writel_relaxed(8, info->regs + SARADC_DLY_PU_SOC); - - /* Select the channel to be used and trigger conversion */ - writel(SARADC_CTRL_POWER_CTRL - | (chan->channel & SARADC_CTRL_CHN_MASK) - | SARADC_CTRL_IRQ_ENABLE, - info->regs + SARADC_CTRL); - - if (!wait_for_completion_timeout(&info->completion, - SARADC_TIMEOUT)) { - writel_relaxed(0, info->regs + SARADC_CTRL); + ret = rockchip_saradc_conversion(info, chan); + if (ret) { + rockchip_saradc_power_down(info); mutex_unlock(&indio_dev->mlock); - return -ETIMEDOUT; + return ret; } - *val = info->last_val; mutex_unlock(&indio_dev->mlock); return IIO_VAL_INT; @@ -91,7 +115,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, } *val = ret / 1000; - *val2 = info->data->num_bits; + *val2 = chan->scan_type.realbits; return IIO_VAL_FRACTIONAL_LOG2; default: return -EINVAL; @@ -104,10 +128,9 @@ static irqreturn_t rockchip_saradc_isr(int irq, void *dev_id) /* Read value */ info->last_val = readl_relaxed(info->regs + SARADC_DATA); - info->last_val &= GENMASK(info->data->num_bits - 1, 0); + info->last_val &= GENMASK(info->last_chan->scan_type.realbits - 1, 0); - /* Clear irq & power down adc */ - writel_relaxed(0, info->regs + SARADC_CTRL); + rockchip_saradc_power_down(info); complete(&info->completion); @@ -118,51 +141,55 @@ static const struct iio_info rockchip_saradc_iio_info = { .read_raw = rockchip_saradc_read_raw, }; -#define ADC_CHANNEL(_index, _id) { \ +#define ADC_CHANNEL(_index, _id, _res) { \ .type = IIO_VOLTAGE, \ .indexed = 1, \ .channel = _index, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ .datasheet_name = _id, \ + .scan_index = _index, \ + .scan_type = { \ + .sign = 'u', \ + .realbits = _res, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ } static const struct iio_chan_spec rockchip_saradc_iio_channels[] = { - ADC_CHANNEL(0, "adc0"), - ADC_CHANNEL(1, "adc1"), - ADC_CHANNEL(2, "adc2"), + ADC_CHANNEL(0, "adc0", 10), + ADC_CHANNEL(1, "adc1", 10), + ADC_CHANNEL(2, "adc2", 10), }; static const struct rockchip_saradc_data saradc_data = { - .num_bits = 10, .channels = rockchip_saradc_iio_channels, .num_channels = ARRAY_SIZE(rockchip_saradc_iio_channels), .clk_rate = 1000000, }; static const struct iio_chan_spec rockchip_rk3066_tsadc_iio_channels[] = { - ADC_CHANNEL(0, "adc0"), - ADC_CHANNEL(1, "adc1"), + ADC_CHANNEL(0, "adc0", 12), + ADC_CHANNEL(1, "adc1", 12), }; static const struct rockchip_saradc_data rk3066_tsadc_data = { - .num_bits = 12, .channels = rockchip_rk3066_tsadc_iio_channels, .num_channels = ARRAY_SIZE(rockchip_rk3066_tsadc_iio_channels), .clk_rate = 50000, }; static const struct iio_chan_spec rockchip_rk3399_saradc_iio_channels[] = { - ADC_CHANNEL(0, "adc0"), - ADC_CHANNEL(1, "adc1"), - ADC_CHANNEL(2, "adc2"), - ADC_CHANNEL(3, "adc3"), - ADC_CHANNEL(4, "adc4"), - ADC_CHANNEL(5, "adc5"), + ADC_CHANNEL(0, "adc0", 10), + ADC_CHANNEL(1, "adc1", 10), + ADC_CHANNEL(2, "adc2", 10), + ADC_CHANNEL(3, "adc3", 10), + ADC_CHANNEL(4, "adc4", 10), + ADC_CHANNEL(5, "adc5", 10), }; static const struct rockchip_saradc_data rk3399_saradc_data = { - .num_bits = 10, .channels = rockchip_rk3399_saradc_iio_channels, .num_channels = ARRAY_SIZE(rockchip_rk3399_saradc_iio_channels), .clk_rate = 1000000, @@ -193,6 +220,42 @@ static void rockchip_saradc_reset_controller(struct reset_control *reset) reset_control_deassert(reset); } +static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *i_dev = pf->indio_dev; + struct rockchip_saradc *info = iio_priv(i_dev); + struct { + u16 values[SARADC_BUFFER_NUM_U16]; + int64_t timestamp; + } data; + int ret; + int i, j = 0; + + mutex_lock(&i_dev->mlock); + + for_each_set_bit(i, i_dev->active_scan_mask, i_dev->masklength) { + const struct iio_chan_spec *chan = &i_dev->channels[i]; + + ret = rockchip_saradc_conversion(info, chan); + if (ret) { + rockchip_saradc_power_down(info); + goto out; + } + + data.values[j] = info->last_val; + j++; + } + + iio_push_to_buffers_with_timestamp(i_dev, &data, iio_get_time_ns(i_dev)); +out: + mutex_unlock(&i_dev->mlock); + + iio_trigger_notify_done(i_dev->trig); + + return IRQ_HANDLED; +} + static int rockchip_saradc_probe(struct platform_device *pdev) { struct rockchip_saradc *info = NULL; @@ -221,6 +284,11 @@ static int rockchip_saradc_probe(struct platform_device *pdev) info->data = match->data; + if (info->data->num_channels > SARADC_MAX_CHANNELS) { + dev_err(&pdev->dev, "max channels exceeded"); + return -EINVAL; + } + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(info->regs)) @@ -315,6 +383,12 @@ static int rockchip_saradc_probe(struct platform_device *pdev) indio_dev->channels = info->data->channels; indio_dev->num_channels = info->data->num_channels; + ret = devm_iio_triggered_buffer_setup(&indio_dev->dev, indio_dev, NULL, + rockchip_saradc_trigger_handler, + NULL); + if (ret) + goto err_clk; + ret = iio_device_register(indio_dev); if (ret) goto err_clk;