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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 14:50:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 14:50:51 -0700 |
commit | 41844e36206be90cd4d962ea49b0abc3612a99d0 (patch) | |
tree | ce0b3a3403bc6abdb28f52779d0d7b57a51a5c86 /drivers/iio/accel/dmard09.c | |
parent | 5691f0e9a3e7855832d5fd094801bf600347c2d0 (diff) | |
parent | fc1e2c8ea85e109acf09e74789e9b852f6eed251 (diff) | |
download | op-kernel-dev-41844e36206be90cd4d962ea49b0abc3612a99d0.zip op-kernel-dev-41844e36206be90cd4d962ea49b0abc3612a99d0.tar.gz |
Merge tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging and IIO updates from Greg KH:
"Here is the big staging and IIO driver pull request for 4.9-rc1.
There are a lot of patches in here, the majority due to the
drivers/staging/greybus/ subsystem being merged in with full
development history that went back a few years, in order to preserve
the work that those developers did over time.
Lots and lots of tiny cleanups happened in the tree as well, due to
the Outreachy application process and lots of other developers showing
up for the first time to clean code up. Along with those changes, we
deleted a wireless driver, and added a raspberrypi driver (currently
marked broken), and lots of new iio drivers.
Overall the tree still shrunk with more lines removed than added,
about 10 thousand lines removed in total. Full details are in the very
long shortlog below.
All of this has been in the linux-next tree with no issues. There will
be some merge problems with other subsystem trees, but those are all
minor problems and shouldn't be hard to work out when they happen
(MAINTAINERS and some lustre build problems with the IB tree)"
And furter from me asking for clarification about greybus:
"Right now there is a phone from Motorola shipping with this code (a
slightly older version, but the same tree), so even though Ara is not
alive in the same form, the functionality is happening. We are working
with the developers of that phone to merge the newer stuff in with
their fork so they can use the upstream version in future versions of
their phone product line.
Toshiba has at least one chip shipping in their catalog that
needs/uses this protocol over a Unipro link, and rumor has it that
there might be more in the future.
There are also other users of the greybus protocols, there is a talk
next week at ELC that shows how it is being used across a network
connection to control a device, and previous ELC talks have showed the
protocol stack being used over USB to drive embedded Linux boards.
I've also talked to some people who are starting to work to add a host
controller driver to control arduinos as the greybus PHY protocols are
very useful to control a serial/i2c/spio/whatever device across a
random physical link, as it is a way to have a self-describing device
be attached to a host without needing manual configuration.
So yes, people are using it, and there is still the chance that it
will show up in a phone/laptop/tablet/whatever from Google in the
future as well, the tech isn't dead, even if the original large phone
project happens to be"
* tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (3703 commits)
Staging: fbtft: Fix bug in fbtft-core
staging: rtl8188eu: fix double unlock error in rtw_resume_process()
staging:r8188eu: remove GEN_MLME_EXT_HANDLER macro
staging:r8188eu: remove GEN_DRV_CMD_HANDLER macro
staging:r8188eu: remove GEN_EVT_CODE macro
staging:r8188eu: remove GEN_CMD_CODE macro
staging:r8188eu: remove pkt_newalloc member of the recv_buf structure
staging:r8188eu: remove rtw_handle_dualmac declaration
staging:r8188eu: remove (RGTRY|BSSID)_(OFT|SZ) macros
staging:r8188eu: change rtl8188e_process_phy_info function argument type
Staging: fsl-mc: Remove blank lines
Staging: fsl-mc: Fix unaligned * in block comments
Staging: comedi: Align the * in block comments
Staging : ks7010 : Fix block comments warninig
Staging: vt6655: Remove explicit NULL comparison using Coccinelle
staging: rtl8188eu: core: rtw_xmit: Use macros instead of constants
staging: rtl8188eu: core: rtw_xmit: Move constant of the right side
staging: dgnc: Fix lines longer than 80 characters
Staging: dgnc: constify attribute_group structures
Staging: most: hdm-dim2: constify attribute_group structures
...
Diffstat (limited to 'drivers/iio/accel/dmard09.c')
-rw-r--r-- | drivers/iio/accel/dmard09.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/iio/accel/dmard09.c b/drivers/iio/accel/dmard09.c new file mode 100644 index 0000000..d3a28f9 --- /dev/null +++ b/drivers/iio/accel/dmard09.c @@ -0,0 +1,157 @@ +/* + * IIO driver for the 3-axis accelerometer Domintech DMARD09. + * + * Copyright (c) 2016, Jelle van der Waa <jelle@vdwaa.nl> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <asm/unaligned.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/iio/iio.h> + +#define DMARD09_DRV_NAME "dmard09" + +#define DMARD09_REG_CHIPID 0x18 +#define DMARD09_REG_STAT 0x0A +#define DMARD09_REG_X 0x0C +#define DMARD09_REG_Y 0x0E +#define DMARD09_REG_Z 0x10 +#define DMARD09_CHIPID 0x95 + +#define DMARD09_BUF_LEN 8 +#define DMARD09_AXIS_X 0 +#define DMARD09_AXIS_Y 1 +#define DMARD09_AXIS_Z 2 +#define DMARD09_AXIS_X_OFFSET ((DMARD09_AXIS_X + 1) * 2) +#define DMARD09_AXIS_Y_OFFSET ((DMARD09_AXIS_Y + 1 )* 2) +#define DMARD09_AXIS_Z_OFFSET ((DMARD09_AXIS_Z + 1) * 2) + +struct dmard09_data { + struct i2c_client *client; +}; + +#define DMARD09_CHANNEL(_axis, offset) { \ + .type = IIO_ACCEL, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .modified = 1, \ + .address = offset, \ + .channel2 = IIO_MOD_##_axis, \ +} + +static const struct iio_chan_spec dmard09_channels[] = { + DMARD09_CHANNEL(X, DMARD09_AXIS_X_OFFSET), + DMARD09_CHANNEL(Y, DMARD09_AXIS_Y_OFFSET), + DMARD09_CHANNEL(Z, DMARD09_AXIS_Z_OFFSET), +}; + +static int dmard09_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct dmard09_data *data = iio_priv(indio_dev); + u8 buf[DMARD09_BUF_LEN]; + int ret; + s16 accel; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + /* + * Read from the DMAR09_REG_STAT register, since the chip + * caches reads from the individual X, Y, Z registers. + */ + ret = i2c_smbus_read_i2c_block_data(data->client, + DMARD09_REG_STAT, + DMARD09_BUF_LEN, buf); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg %d\n", + DMARD09_REG_STAT); + return ret; + } + + accel = get_unaligned_le16(&buf[chan->address]); + + /* Remove lower 3 bits and sign extend */ + accel <<= 4; + accel >>= 7; + + *val = accel; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static const struct iio_info dmard09_info = { + .driver_module = THIS_MODULE, + .read_raw = dmard09_read_raw, +}; + +static int dmard09_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct iio_dev *indio_dev; + struct dmard09_data *data; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) { + dev_err(&client->dev, "iio allocation failed\n"); + return -ENOMEM; + } + + data = iio_priv(indio_dev); + data->client = client; + + ret = i2c_smbus_read_byte_data(data->client, DMARD09_REG_CHIPID); + if (ret < 0) { + dev_err(&client->dev, "Error reading chip id %d\n", ret); + return ret; + } + + if (ret != DMARD09_CHIPID) { + dev_err(&client->dev, "Invalid chip id %d\n", ret); + return -ENODEV; + } + + i2c_set_clientdata(client, indio_dev); + indio_dev->dev.parent = &client->dev; + indio_dev->name = DMARD09_DRV_NAME; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = dmard09_channels; + indio_dev->num_channels = ARRAY_SIZE(dmard09_channels); + indio_dev->info = &dmard09_info; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct i2c_device_id dmard09_id[] = { + { "dmard09", 0}, + { }, +}; + +MODULE_DEVICE_TABLE(i2c, dmard09_id); + +static struct i2c_driver dmard09_driver = { + .driver = { + .name = DMARD09_DRV_NAME + }, + .probe = dmard09_probe, + .id_table = dmard09_id, +}; + +module_i2c_driver(dmard09_driver); + +MODULE_AUTHOR("Jelle van der Waa <jelle@vdwaa.nl>"); +MODULE_DESCRIPTION("DMARD09 3-axis accelerometer driver"); +MODULE_LICENSE("GPL"); |