Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753505AbbHMRcO (ORCPT ); Thu, 13 Aug 2015 13:32:14 -0400 Received: from mga14.intel.com ([192.55.52.115]:22147 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753456AbbHMRcL (ORCPT ); Thu, 13 Aug 2015 13:32:11 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,671,1432623600"; d="scan'208";a="783116178" From: Teodora Baluta To: jic23@kernel.org Cc: knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, daniel.baluta@intel.com, teodora.baluta@intel.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] iio: mxc4005: add data ready trigger for mxc4005 Date: Thu, 13 Aug 2015 20:31:41 +0300 Message-Id: <1439487101-13085-4-git-send-email-teodora.baluta@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439487101-13085-1-git-send-email-teodora.baluta@intel.com> References: <1439487101-13085-1-git-send-email-teodora.baluta@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6970 Lines: 261 Add iio trigger for the data ready interrupt that signals new measurements for the X, Y and Z axes. Signed-off-by: Teodora Baluta --- drivers/iio/accel/mxc4005.c | 159 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 158 insertions(+), 1 deletion(-) diff --git a/drivers/iio/accel/mxc4005.c b/drivers/iio/accel/mxc4005.c index 5f4813d..0c47bfe 100644 --- a/drivers/iio/accel/mxc4005.c +++ b/drivers/iio/accel/mxc4005.c @@ -17,13 +17,16 @@ #include #include #include +#include #include #include +#include #include #include #include #define MXC4005_DRV_NAME "mxc4005" +#define MXC4005_IRQ_NAME "mxc4005_event" #define MXC4005_REGMAP_NAME "mxc4005_regmap" #define MXC4005_REG_XOUT_UPPER 0x03 @@ -33,6 +36,15 @@ #define MXC4005_REG_ZOUT_UPPER 0x07 #define MXC4005_REG_ZOUT_LOWER 0x08 +#define MXC4005_REG_INT_SRC1 0x01 +#define MXC4005_REG_INT_SRC2_BIT_DRDY 0x01 + +#define MXC4005_REG_INT_MASK1 0x0B +#define MXC4005_REG_INT_MASK1_BIT_DRDYE 0x01 + +#define MXC4005_REG_INT_CLR1 0x01 +#define MXC4005_REG_INT_CLR1_BIT_DRDYC 0x01 + #define MXC4005_REG_CONTROL 0x0D #define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5) #define MXC4005_CONTROL_FSR_SHIFT 5 @@ -55,7 +67,10 @@ struct mxc4005_data { struct i2c_client *client; struct mutex mutex; struct regmap *regmap; + struct iio_trigger *dready_trig; + int64_t timestamp; __be16 buffer[3]; + bool trigger_enabled; }; /* @@ -97,6 +112,7 @@ static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg) case MXC4005_REG_ZOUT_UPPER: case MXC4005_REG_ZOUT_LOWER: case MXC4005_REG_DEVICE_ID: + case MXC4005_REG_INT_SRC1: case MXC4005_REG_CONTROL: return true; default: @@ -107,6 +123,8 @@ static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg) static bool mxc4005_is_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { + case MXC4005_REG_INT_CLR1: + case MXC4005_REG_INT_MASK1: case MXC4005_REG_CONTROL: return true; default: @@ -300,7 +318,7 @@ static irqreturn_t mxc4005_trigger_handler(int irq, void *private) goto err; iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, - iio_get_time_ns()); + data->timestamp); err: iio_trigger_notify_done(indio_dev->trig); @@ -308,6 +326,103 @@ err: return IRQ_HANDLED; } +static int mxc4005_set_trigger_state(struct iio_trigger *trig, + bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct mxc4005_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->mutex); + if (state) { + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1, + MXC4005_REG_INT_MASK1_BIT_DRDYE); + } else { + ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1, + ~MXC4005_REG_INT_MASK1_BIT_DRDYE); + } + + if (ret < 0) { + mutex_unlock(&data->mutex); + dev_err(&data->client->dev, + "failed to update reg_int_mask1"); + return ret; + } + + data->trigger_enabled = state; + mutex_unlock(&data->mutex); + + return 0; +} + +static const struct iio_trigger_ops mxc4005_trigger_ops = { + .set_trigger_state = mxc4005_set_trigger_state, + .owner = THIS_MODULE, +}; + +static irqreturn_t mxc4005_irq_thrd_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct mxc4005_data *data = iio_priv(indio_dev); + unsigned int reg; + int ret; + + ret = regmap_read(data->regmap, MXC4005_REG_INT_SRC1, ®); + if (ret < 0) { + dev_err(&data->client->dev, "failed to read reg_int_src1\n"); + goto exit; + } + + /* clear interrupt */ + ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1, + MXC4005_REG_INT_CLR1_BIT_DRDYC); + if (ret < 0) { + dev_err(&data->client->dev, "failed to write to reg_int_clr1\n"); + goto exit; + } + +exit: + return IRQ_HANDLED; +} + +static irqreturn_t mxc4005_irq_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct mxc4005_data *data = iio_priv(indio_dev); + + data->timestamp = iio_get_time_ns(); + + if (data->trigger_enabled) + iio_trigger_poll(data->dready_trig); + + return IRQ_WAKE_THREAD; +} + +static int mxc4005_gpio_probe(struct i2c_client *client, + struct mxc4005_data *data) +{ + struct device *dev; + struct gpio_desc *gpio; + int ret; + + if (!client) + return -EINVAL; + + dev = &client->dev; + + gpio = devm_gpiod_get_index(dev, "mxc4005_int", 0, GPIOD_IN); + if (IS_ERR(gpio)) { + dev_err(dev, "failed to get acpi gpio index\n"); + return PTR_ERR(gpio); + } + + ret = gpiod_to_irq(gpio); + + dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret); + + return ret; +} + static int mxc4005_chip_init(struct mxc4005_data *data) { int ret; @@ -373,6 +488,43 @@ static int mxc4005_probe(struct i2c_client *client, return ret; } + if (client->irq < 0) + client->irq = mxc4005_gpio_probe(client, data); + + if (client->irq >= 0) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + mxc4005_irq_handler, + mxc4005_irq_thrd_handler, + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + MXC4005_IRQ_NAME, + indio_dev); + if (ret) { + dev_err(&client->dev, + "failed to init threaded irq\n"); + goto err_buffer_cleanup; + } + + data->dready_trig = devm_iio_trigger_alloc(&client->dev, + "%s-dev%d", + indio_dev->name, + indio_dev->id); + if (!data->dready_trig) + return -ENOMEM; + + data->dready_trig->dev.parent = &client->dev; + data->dready_trig->ops = &mxc4005_trigger_ops; + iio_trigger_set_drvdata(data->dready_trig, indio_dev); + indio_dev->trig = data->dready_trig; + iio_trigger_get(indio_dev->trig); + ret = iio_trigger_register(data->dready_trig); + if (ret) { + dev_err(&client->dev, + "failed to register trigger\n"); + goto err_trigger_unregister; + } + } + ret = iio_device_register(indio_dev); if (ret < 0) { dev_err(&client->dev, @@ -382,6 +534,8 @@ static int mxc4005_probe(struct i2c_client *client, return 0; +err_trigger_unregister: + iio_trigger_unregister(data->dready_trig); err_buffer_cleanup: iio_triggered_buffer_cleanup(indio_dev); @@ -391,10 +545,13 @@ err_buffer_cleanup: static int mxc4005_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct mxc4005_data *data = iio_priv(indio_dev); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); + if (data->dready_trig) + iio_trigger_unregister(data->dready_trig); return 0; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/