On Thu, Aug 1, 2013 at 12:18 AM, Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > On 07/29/13 16:15, Peter Meerwald wrote: >> >> kicking out drivers fast :) >> few comments below; the driver exposes only minimal iio features and >> integrates input subsystem, this doesn't seem right >> > Only taken a very quick look but Peter is quite right. Either > this is very much an input directed driver in which case rip out the > IIO stuff and submit it as an input driver, or it is a multipurpose part > in which case the 'right' way to do it is that bridge driver I keep > failing to bring up to date (anyone else fancy taking it on? I'll probably > get to it, but right now all my available time goes on review so new > features in my hands will take a while!) > > There are some other corners that still need doing, but having large > quantities of input calls within an IIO driver is not going anywhere > as it just makes for a maintenance mess. > > Actually this driver doesn't support what we would call events in IIO > so the current feature set of that bridge would probably be fine. Note > to use it you'd need full trigger and buffer support under IIO. I can't completely understand how to use IIO buffer and trigger in my driver. Please advice me which driver can I use as reference. > > Anyhow, up to you whether you want to pitch this to linux-input with > IIO removed or go the IIO and input bridge route (last version > 'might' be http://marc.info/?l=linux-iio&m=135167944813803&w=2 . > >>> >>> diff --git a/Documentation/devicetree/bindings/iio/accel/bma180.txt b/Documentation/devicetree/bindings/iio/accel/bma180.txt >>> new file mode 100644 >>> index 0000000..7c13c84 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/iio/accel/bma180.txt >>> @@ -0,0 +1,53 @@ >>> +* Bosch BMA180 triaxial acceleration sensor >>> + >>> +http://omapworld.com/BMA180_111_1002839.pdf >>> + >>> +Required properties: >>> + >>> + - compatible : should be "bosch,bma180" >>> + - reg : the I2C address of the sensor >>> + >>> +Optional properties: >>> + >>> + - interrupt-parent : should be the phandle for the interrupt controller >>> + >>> + - interrupts : interrupt mapping for GPIO IRQ, it shuld by configured with >>> + flags IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING >>> + >>> + - range : select the full scale acceleration range >>> + 0 : -1g..+1g >>> + 1 : -1.5g..+1.5g >>> + 2 : -2g..+2g >>> + 3 : -3g..+3g >>> + 4 : -4g..+4g >>> + 5 : -8g..+8g >>> + 6 : -16g..+16g >>> + >>> + - bw : select bandwidth bandwidth >>> + 0 : 10Hz >>> + 1 : 20Hz >>> + 2 : 40Hz >>> + 3 : 75Hz >>> + 4 : 150Hz >>> + 5 : 300Hz > Surely magic numbers should be as unacceptible in device tree files > as anywhere else? It's hardly difficult to use the actual values > for this. > >>> + Don't use bandwidth frequency more than 300Hz couse it >> >> because >> >>> + influences the frequency of generating new data interrupts >>> + and i2c reading phase can be longer than pheriod of interrupt >> >> period >> >>> + generation. >>> + >>> + - mode_config : 0 - select low noise mode, 1 - select low power mode >>> + >>> + - fuzz : specifies fuzz value that is used to filter noise from the event stream >>> + >>> +Example: >>> + >>> +bma180@40 { >>> + compatible = "bosch,bma180"; >>> + reg = <0x40>; >>> + interrupt-parent = <&gpio6>; >>> + interrupts = <18 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>; >>> + range = <2>; >>> + bw = <0>; >>> + mode_config = <1>; >>> + fuzz = <555>; >>> +}; >>> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig >>> index 719d83f..61fd29f 100644 >>> --- a/drivers/iio/accel/Kconfig >>> +++ b/drivers/iio/accel/Kconfig >>> @@ -3,6 +3,16 @@ >>> # >>> menu "Accelerometers" >>> >>> +config BMA180 >>> + tristate "Bosch BMA180 3-Axis Accelerometer Driver" >>> + depends on I2C >>> + help >>> + Say Y here if you want to build a driver for the Bosch BMA180 >>> + triaxial acceleration sensor. >>> + >>> + To compile this driver as a module, choose M here: the >>> + module will be called bma180. >>> + >>> config HID_SENSOR_ACCEL_3D >>> depends on HID_SENSOR_HUB >>> select IIO_BUFFER >>> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile >>> index 87d8fa2..31a36fa 100644 >>> --- a/drivers/iio/accel/Makefile >>> +++ b/drivers/iio/accel/Makefile >>> @@ -12,3 +12,5 @@ obj-$(CONFIG_IIO_ST_ACCEL_I2C_3AXIS) += st_accel_i2c.o >>> obj-$(CONFIG_IIO_ST_ACCEL_SPI_3AXIS) += st_accel_spi.o >>> >>> obj-$(CONFIG_KXSD9) += kxsd9.o >>> + >>> +obj-$(CONFIG_BMA180) += bma180.o >> >> alphabetic order >> >>> diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c >>> new file mode 100644 >>> index 0000000..9f5341f >>> --- /dev/null >>> +++ b/drivers/iio/accel/bma180.c >>> @@ -0,0 +1,462 @@ >>> +/* >>> + * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor >>> + * >>> + * Copyright 2013 Oleksandr Kravchenko <x0199363@xxxxxx> >>> + * >>> + * This file is subject to the terms and conditions of version 2 of >>> + * the GNU General Public License. See the file COPYING in the main >>> + * directory of this archive for more details. >>> + */ >>> + >>> +#include <linux/module.h> >>> +#include <linux/i2c.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/delay.h> >>> +#include <linux/input.h> >>> +#include <linux/of.h> >>> +#include <linux/bitops.h> >>> +#include <linux/iio/iio.h> >>> +#include <linux/iio/sysfs.h> >>> +#include <linux/iio/events.h> >>> + >>> +#define BMA180_DRV_NAME "bma180" >>> +#define BMA180_IRQ_NAME "bma180_event" >>> + >>> +/* Register set */ >>> +#define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */ >>> +#define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */ >>> +#define BMA180_CTRL_REG0 0x0d >>> +#define BMA180_RESET 0x10 >>> +#define BMA180_BW_TCS 0x20 >>> +#define BMA180_CTRL_REG3 0x21 >>> +#define BMA180_TCO_Z 0x30 >>> +#define BMA180_OFFSET_LSB1 0x35 >>> + >>> +/* Control bits */ >>> +#define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */ >>> +#define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */ >>> +#define BMA180_EE_W BIT(4) /* Unlock writing to addr. from 0x20 */ >>> +#define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */ >>> +#define BMA180_SMP_SKIP BIT(0) /* Sample skipping mode */ >> >> maybe say which bits belong to which CTRL reg? >> >>> + >>> +/* Bit masks fo registerts bit fields */ >> >> typos: fo, registerts >> >>> +#define BMA180_RANGE 0x0e /* Range of accel measurment */ >>> +#define BMA180_BW 0xf0 /* Accel measurmend bandwidth */ >> >> typo: measurmend >> >>> +#define BMA180_MODE_CONFIG 0x03 /* Config operation modes */ >>> + >>> +/* We have write this value in reset register to do soft reset */ >> >> have 'to' write >> >>> +#define BMA180_RESET_VAL 0xb6 >>> + >>> +/* Chip operation modes */ >>> +#define BMA180_LOW_NOISE 0x00 >>> +#define BMA180_LOW_POWER 0x03 >>> + >>> +struct bma180_data { >>> + struct i2c_client *client; >>> + struct input_dev *input_dev; >>> + struct mutex mutex; >>> + int sleep_state; >>> + int range; >>> + int bw; >>> + int mode; >>> + int fuzz; >>> + int acc_reg[3]; >>> +}; >>> + >>> +enum bma180_axis { >>> + AXIS_X, >>> + AXIS_Y, >>> + AXIS_Z, >>> +}; >>> + >>> +struct bma180_range { >>> + int g_range; >>> + int ratio; >>> +}; >>> + >>> +static struct bma180_range bma180_range_table[7] = { >>> + { 1000, 130 }, >>> + { 1500, 190 }, >>> + { 2000, 250 }, >>> + { 3000, 380 }, >>> + { 4000, 500 }, >>> + { 8000, 990 }, >>> + { 16000, 1980 }, >>> +}; >>> + >>> +static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis) >>> +{ >>> + u8 reg = BMA180_ACC_X_LSB + axis * 2; >>> + int ret; >>> + >>> + if (data->sleep_state) >>> + return -EBUSY; >>> + >>> + ret = i2c_smbus_read_word_data(data->client, reg); >>> + if (ret < 0) >>> + dev_err(&data->client->dev, >>> + "failed to read accel_%c registers\n", 'x' + axis); >> >> just one register, not registers? >> >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val) >>> +{ >>> + int ret = i2c_smbus_read_byte_data(data->client, reg); >>> + u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1)); >>> + >>> + if (ret < 0) >>> + return ret; >>> + >>> + return i2c_smbus_write_byte_data(data->client, reg, reg_val); >>> +} >>> + >>> +static int bma180_set_new_data_intr_state(struct bma180_data *data, int state) >>> +{ >>> + u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00; >>> + int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3, >>> + reg_val); >>> + >>> + if (ret) >>> + dev_err(&data->client->dev, >>> + "failed to set new data interrupt state %d\n", state); >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_set_sleep_state(struct bma180_data *data, int state) >>> +{ >>> + int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state); >>> + >>> + if (ret) { >>> + dev_err(&data->client->dev, >>> + "failed to set sleep state %d\n", state); >>> + return ret; >>> + } >>> + data->sleep_state = state; >>> + >>> + return 0; >>> +} >>> + >>> +static int bma180_set_ee_writing_state(struct bma180_data *data, int state) >>> +{ >>> + int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state); >>> + >>> + if (ret) >>> + dev_err(&data->client->dev, >>> + "failed to set ee writing state %d\n", state); >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_soft_reset(struct bma180_data *data) >>> +{ >>> + int ret = i2c_smbus_write_byte_data(data->client, >>> + BMA180_RESET, BMA180_RESET_VAL); >>> + >>> + if (ret) >>> + dev_err(&data->client->dev, "failed to reset the chip\n"); >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_chip_init(struct bma180_data *data) >>> +{ >>> + /* Try to read chip_id register. It must return 0x03. */ >>> + int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID); >>> + >>> + if (ret < 0) >>> + goto err; >>> + if (ret != 0x03) { >>> + ret = -ENODEV; >>> + goto err; >>> + } >>> + >>> + ret = bma180_soft_reset(data); >>> + if (ret) >>> + goto err; >>> + /* >>> + * No serial transaction should occur within minimum 10 μs >>> + * after soft_reset command >>> + */ >>> + msleep(20); >>> + >>> + ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_ee_writing_state(data, 1); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_new_data_intr_state(data, 0); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_bits(data, BMA180_BW_TCS, BMA180_BW, data->bw); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_bits(data, >>> + BMA180_OFFSET_LSB1, BMA180_RANGE, data->range); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG, >>> + data->mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_new_data_intr_state(data, 1); >>> + if (ret) >>> + goto err; >>> + ret = bma180_set_ee_writing_state(data, 0); >>> + if (ret) >>> + goto err; >>> + >>> + return 0; >>> + >>> +err: >>> + dev_err(&data->client->dev, "failed to init the chip\n"); >>> + return ret; >>> +} >>> + >>> +static void bma180_chip_disable(struct bma180_data *data) >>> +{ >>> + if (bma180_set_ee_writing_state(data, 1)) >>> + goto err; >>> + if (bma180_set_new_data_intr_state(data, 0)) >>> + goto err; >>> + if (bma180_set_ee_writing_state(data, 0)) >>> + goto err; >>> + if (bma180_set_sleep_state(data, 1)) >>> + goto err; >>> + >>> + return; >>> + >>> +err: >>> + dev_err(&data->client->dev, "failed to disable the chip\n"); >>> +} >>> + >>> +static int bma180_read_raw(struct iio_dev *indio_dev, >>> + struct iio_chan_spec const *chan, int *val, int *val2, >>> + long mask) >>> +{ >>> + struct bma180_data *data = iio_priv(indio_dev); >>> + long tmp = ((s16)data->acc_reg[chan->channel] >> 2) >>> + * bma180_range_table[data->range].ratio; >>> + >>> + if (data->acc_reg[chan->channel] < 0) >>> + return data->acc_reg[chan->channel]; >>> + >>> + *val = tmp / 1000000; >>> + *val2 = (tmp % 1000000); >>> + >>> + return IIO_VAL_INT_PLUS_MICRO; >>> +} >>> + >>> +static const struct iio_info bma180_info = { >>> + .driver_module = THIS_MODULE, >>> + .read_raw = &bma180_read_raw, >>> +}; >>> + >>> +static const struct iio_chan_spec bma180_channels[] = { >>> + { >>> + .type = IIO_ACCEL, >>> + .channel = AXIS_X, >>> + .channel2 = IIO_MOD_X, >>> + .indexed = true, >> >> do the channels need to be indexed? >> >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), >>> + }, { >>> + .type = IIO_ACCEL, >>> + .channel = AXIS_Y, >>> + .channel2 = IIO_MOD_Y, >>> + .indexed = true, >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), >>> + }, { >>> + .type = IIO_ACCEL, >>> + .channel = AXIS_Z, >>> + .channel2 = IIO_MOD_Z, >>> + .indexed = true, >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), >>> + }, >>> +}; >>> + >>> +static irqreturn_t bma180_interrupt_handler(int irq, void *private) >>> +{ >>> + struct iio_dev *dev_info = private; >>> + struct bma180_data *data = iio_priv(dev_info); >>> + int i; >>> + >>> + mutex_lock(&data->mutex); >>> + for (i = AXIS_X; i <= AXIS_Z; ++i) >>> + data->acc_reg[i] = bma180_get_acc_reg(data, i); >>> + mutex_unlock(&data->mutex); >>> + >>> + input_report_abs(data->input_dev, ABS_X, data->acc_reg[AXIS_X]); >>> + input_report_abs(data->input_dev, ABS_Y, data->acc_reg[AXIS_Y]); >>> + input_report_abs(data->input_dev, ABS_Z, data->acc_reg[AXIS_Z]); >> >> input subsystem stuff within IIO? >> uhoh... >> >> the driver should probably support more iio features: trigger, scan_mode, >> buffer >> >>> + input_sync(data->input_dev); >>> + >>> + return IRQ_HANDLED; >>> +} >>> + >>> +static int bma180_probe(struct i2c_client *client, >>> + const struct i2c_device_id *id) >>> +{ >>> + struct input_dev *input_dev; >>> + struct bma180_data *data; >>> + struct iio_dev *indio_dev; >>> + struct device_node *np = client->dev.of_node; >>> + int i, ret; >>> + >>> + if (!client->irq) { >>> + dev_err(&client->dev, "this driver cann't work without IRQ\n"); >> >> can't >> >>> + return -ENODEV; >>> + } >>> + >>> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); >>> + if (!indio_dev) >>> + return -ENOMEM; >>> + >>> + input_dev = input_allocate_device(); >>> + if (!input_dev) >>> + return -ENOMEM; >>> + >>> + data = iio_priv(indio_dev); >>> + i2c_set_clientdata(client, indio_dev); >>> + data->client = client; >>> + >>> + of_property_read_u32(np, "bw", &data->bw); >>> + of_property_read_u32(np, "range", &data->range); >>> + of_property_read_u32(np, "mode", &data->mode); >>> + of_property_read_u32(np, "fuzz", &data->fuzz); >>> + >>> + ret = bma180_chip_init(data); >>> + if (ret < 0) >>> + goto err_1; >>> + >>> + mutex_init(&data->mutex); >>> + >>> + indio_dev->dev.parent = &client->dev; >>> + indio_dev->channels = bma180_channels; >>> + indio_dev->num_channels = ARRAY_SIZE(bma180_channels); >>> + indio_dev->name = BMA180_DRV_NAME; >>> + indio_dev->modes = INDIO_DIRECT_MODE; >>> + indio_dev->info = &bma180_info; >>> + >>> + input_dev->name = BMA180_DRV_NAME; >>> + input_dev->id.bustype = BUS_I2C; >>> + __set_bit(EV_ABS, input_dev->evbit); >>> + for (i = ABS_X; i <= ABS_Z; ++i) >>> + input_set_abs_params(input_dev, i, >>> + -bma180_range_table[data->range].g_range, >>> + bma180_range_table[data->range].g_range, >>> + data->fuzz, 0); >>> + input_dev->dev.parent = &client->dev; >>> + input_set_drvdata(input_dev, data); >>> + >>> + data->input_dev = input_dev; >>> + >>> + ret = devm_request_threaded_irq(&client->dev, client->irq, >>> + NULL, bma180_interrupt_handler, IRQF_ONESHOT, >>> + BMA180_IRQ_NAME, indio_dev); >>> + if (ret < 0) { >>> + dev_err(&client->dev, "irq request error %d\n", -ret); >>> + goto err_1; >>> + } >>> + >>> + ret = input_register_device(input_dev); >>> + if (ret) { >>> + dev_err(&client->dev, "unable to register input device\n"); >>> + goto err_1; >>> + } >>> + >>> + >> >> extra newline >> >>> + ret = iio_device_register(indio_dev); >>> + if (ret < 0) { >>> + dev_err(&client->dev, "unable to register iio device\n"); >>> + goto err_2; >>> + } >>> + >>> + return 0; >>> + >>> +err_2: >>> + input_unregister_device(input_dev); >>> +err_1: >>> + input_free_device(input_dev); >>> + >>> + bma180_chip_disable(data); >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_remove(struct i2c_client *client) >>> +{ >>> + struct iio_dev *indio_dev = i2c_get_clientdata(client); >>> + struct bma180_data *data = iio_priv(indio_dev); >>> + >>> + iio_device_unregister(indio_dev); >>> + input_unregister_device(data->input_dev); >>> + >>> + mutex_lock(&data->mutex); >>> + bma180_chip_disable(data); >>> + mutex_unlock(&data->mutex); >>> + >>> + return 0; >>> +} >>> + >>> +#ifdef CONFIG_PM_SLEEP >>> +static int bma180_suspend(struct device *dev) >>> +{ >>> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); >>> + struct bma180_data *data = iio_priv(indio_dev); >>> + int ret; >>> + >>> + mutex_lock(&data->mutex); >>> + ret = bma180_set_sleep_state(data, 1); >>> + mutex_unlock(&data->mutex); >>> + >>> + return ret; >>> +} >>> + >>> +static int bma180_resume(struct device *dev) >>> +{ >>> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); >>> + struct bma180_data *data = iio_priv(indio_dev); >>> + int ret; >>> + >>> + mutex_lock(&data->mutex); >>> + ret = bma180_set_sleep_state(data, 0); >>> + mutex_unlock(&data->mutex); >>> + >>> + return ret; >>> +} >>> + >>> +static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume); >>> +#define BMA180_PM_OPS (&bma180_pm_ops) >>> +#else >>> +#define BMA180_PM_OPS NULL >>> +#endif >>> + >>> +static struct i2c_device_id bma180_id[] = { >>> + { BMA180_DRV_NAME, 0 }, >>> + { } >>> +}; >>> + >>> +MODULE_DEVICE_TABLE(i2c, bma180_id); >>> + >>> +static struct i2c_driver bma180_driver = { >>> + .driver = { >>> + .name = BMA180_DRV_NAME, >>> + .owner = THIS_MODULE, >>> + .pm = BMA180_PM_OPS, >>> + }, >>> + .probe = bma180_probe, >>> + .remove = bma180_remove, >>> + .id_table = bma180_id, >>> +}; >>> + >>> +module_i2c_driver(bma180_driver); >>> + >>> +MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@xxxxxx>"); >>> +MODULE_AUTHOR("Texas Instruments, Inc."); >>> +MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor"); >>> +MODULE_LICENSE("GPL"); >>> >> -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
