Commit ee9a691e authored by Barry Song's avatar Barry Song Committed by Greg Kroah-Hartman

Staging: iio: adis16300: fix some minor issues and clean-up

1. add delay between spi transfers
2. move burst read to ring function
3. clean-up
Signed-off-by: default avatarBarry Song <21cnbao@gmail.com>
Acked-by: default avatarJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 794e7d9d
......@@ -115,14 +115,8 @@ struct adis16300_state {
struct mutex buf_lock;
};
int adis16300_spi_read_burst(struct device *dev, u8 *rx);
int adis16300_set_irq(struct device *dev, bool enable);
int adis16300_reset(struct device *dev);
int adis16300_check_status(struct device *dev);
#ifdef CONFIG_IIO_RING_BUFFER
/* At the moment triggers are only used for ring buffer
* filling. This may change!
......
......@@ -29,10 +29,7 @@
#define DRIVER_NAME "adis16300"
/* At the moment the spi framework doesn't allow global setting of cs_change.
* It's in the likely to be added comment at the top of spi.h.
* This means that use cannot be made of spi_write etc.
*/
static int adis16300_check_status(struct device *dev);
/**
* adis16300_spi_write_reg_8() - write single byte to a register
......@@ -79,11 +76,13 @@ static int adis16300_spi_write_reg_16(struct device *dev,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.delay_usecs = 75,
}, {
.tx_buf = st->tx + 2,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.delay_usecs = 75,
},
};
......@@ -122,12 +121,14 @@ static int adis16300_spi_read_reg_16(struct device *dev,
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 0,
.cs_change = 1,
.delay_usecs = 75,
}, {
.rx_buf = st->rx,
.bits_per_word = 8,
.len = 2,
.cs_change = 0,
.cs_change = 1,
.delay_usecs = 75,
},
};
......@@ -154,54 +155,6 @@ static int adis16300_spi_read_reg_16(struct device *dev,
return ret;
}
/**
* adis16300_spi_read_burst() - read all data registers
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @rx: somewhere to pass back the value read (min size is 24 bytes)
**/
int adis16300_spi_read_burst(struct device *dev, u8 *rx)
{
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16300_state *st = iio_dev_get_devdata(indio_dev);
u32 old_speed_hz = st->us->max_speed_hz;
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 0,
}, {
.rx_buf = rx,
.bits_per_word = 8,
.len = 18,
.cs_change = 0,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16300_READ_REG(ADIS16300_GLOB_CMD);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
st->us->max_speed_hz = min(ADIS16300_SPI_BURST, old_speed_hz);
spi_setup(st->us);
ret = spi_sync(st->us, &msg);
if (ret)
dev_err(&st->us->dev, "problem when burst reading");
st->us->max_speed_hz = old_speed_hz;
spi_setup(st->us);
mutex_unlock(&st->buf_lock);
return ret;
}
static ssize_t adis16300_spi_read_signed(struct device *dev,
struct device_attribute *attr,
char *buf,
......@@ -240,6 +193,24 @@ static ssize_t adis16300_read_12bit_unsigned(struct device *dev,
return sprintf(buf, "%u\n", val & 0x0FFF);
}
static ssize_t adis16300_read_14bit_unsigned(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 val = 0;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = adis16300_spi_read_reg_16(dev, this_attr->address, &val);
if (ret)
return ret;
if (val & ADIS16300_ERROR_ACTIVE)
adis16300_check_status(dev);
return sprintf(buf, "%u\n", val & 0x3FFF);
}
static ssize_t adis16300_read_14bit_signed(struct device *dev,
struct device_attribute *attr,
char *buf)
......@@ -356,6 +327,18 @@ static ssize_t adis16300_write_frequency(struct device *dev,
return ret ? ret : len;
}
static int adis16300_reset(struct device *dev)
{
int ret;
ret = adis16300_spi_write_reg_8(dev,
ADIS16300_GLOB_CMD,
ADIS16300_GLOB_CMD_SW_RESET);
if (ret)
dev_err(dev, "problem resetting device");
return ret;
}
static ssize_t adis16300_write_reset(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
......@@ -371,8 +354,6 @@ static ssize_t adis16300_write_reset(struct device *dev,
return -1;
}
int adis16300_set_irq(struct device *dev, bool enable)
{
int ret;
......@@ -396,32 +377,37 @@ int adis16300_set_irq(struct device *dev, bool enable)
return ret;
}
int adis16300_reset(struct device *dev)
/* Power down the device */
static int adis16300_stop_device(struct device *dev)
{
int ret;
ret = adis16300_spi_write_reg_8(dev,
ADIS16300_GLOB_CMD,
ADIS16300_GLOB_CMD_SW_RESET);
u16 val = ADIS16300_SLP_CNT_POWER_OFF;
ret = adis16300_spi_write_reg_16(dev, ADIS16300_SLP_CNT, val);
if (ret)
dev_err(dev, "problem resetting device");
dev_err(dev, "problem with turning device off: SLP_CNT");
return ret;
}
/* Power down the device */
static int adis16300_stop_device(struct device *dev)
static int adis16300_self_test(struct device *dev)
{
int ret;
u16 val = ADIS16300_SLP_CNT_POWER_OFF;
ret = adis16300_spi_write_reg_16(dev,
ADIS16300_MSC_CTRL,
ADIS16300_MSC_CTRL_MEM_TEST);
if (ret) {
dev_err(dev, "problem starting self test");
goto err_ret;
}
ret = adis16300_spi_write_reg_16(dev, ADIS16300_SLP_CNT, val);
if (ret)
dev_err(dev, "problem with turning device off: SLP_CNT");
adis16300_check_status(dev);
err_ret:
return ret;
}
int adis16300_check_status(struct device *dev)
static int adis16300_check_status(struct device *dev)
{
u16 status;
int ret;
......@@ -483,6 +469,11 @@ static int adis16300_initial_setup(struct adis16300_state *st)
}
/* Do self test */
ret = adis16300_self_test(dev);
if (ret) {
dev_err(dev, "self test failure");
goto err_ret;
}
/* Read status register to check the result */
ret = adis16300_check_status(dev);
......@@ -526,7 +517,7 @@ static IIO_DEV_ATTR_ACCEL_Z_OFFSET(S_IWUSR | S_IRUGO,
adis16300_write_16bit,
ADIS16300_ZACCL_OFF);
static IIO_DEV_ATTR_IN_NAMED_RAW(supply, adis16300_read_14bit_signed,
static IIO_DEV_ATTR_IN_NAMED_RAW(supply, adis16300_read_14bit_unsigned,
ADIS16300_SUPPLY_OUT);
static IIO_CONST_ATTR(in_supply_scale, "0.00242");
......@@ -548,7 +539,7 @@ static IIO_DEV_ATTR_INCLI_Y(adis16300_read_13bit_signed,
ADIS16300_YINCLI_OUT);
static IIO_CONST_ATTR(incli_scale, "0.044 d");
static IIO_DEV_ATTR_TEMP_RAW(adis16300_read_12bit_signed);
static IIO_DEV_ATTR_TEMP_RAW(adis16300_read_12bit_unsigned);
static IIO_CONST_ATTR(temp_offset, "198.16 K");
static IIO_CONST_ATTR(temp_scale, "0.14 K");
......@@ -659,15 +650,7 @@ static int __devinit adis16300_probe(struct spi_device *spi)
goto error_unreg_ring_funcs;
}
if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) {
#if 0 /* fixme: here we should support */
iio_init_work_cont(&st->work_cont_thresh,
NULL,
adis16300_thresh_handler_bh_no_check,
0,
0,
st);
#endif
if (spi->irq) {
ret = iio_register_interrupt_line(spi->irq,
st->indio_dev,
0,
......@@ -688,10 +671,9 @@ static int __devinit adis16300_probe(struct spi_device *spi)
return 0;
error_remove_trigger:
if (st->indio_dev->modes & INDIO_RING_TRIGGERED)
adis16300_remove_trigger(st->indio_dev);
error_unregister_line:
if (st->indio_dev->modes & INDIO_RING_TRIGGERED)
if (spi->irq)
iio_unregister_interrupt_line(st->indio_dev, 0);
error_uninitialize_ring:
adis16300_uninitialize_ring(st->indio_dev->ring);
......@@ -712,7 +694,6 @@ static int __devinit adis16300_probe(struct spi_device *spi)
return ret;
}
/* fixme, confirm ordering in this function */
static int adis16300_remove(struct spi_device *spi)
{
int ret;
......@@ -726,12 +707,12 @@ static int adis16300_remove(struct spi_device *spi)
flush_scheduled_work();
adis16300_remove_trigger(indio_dev);
if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0)
if (spi->irq)
iio_unregister_interrupt_line(indio_dev, 0);
adis16300_uninitialize_ring(indio_dev->ring);
adis16300_unconfigure_ring(indio_dev);
iio_device_unregister(indio_dev);
adis16300_unconfigure_ring(indio_dev);
kfree(st->tx);
kfree(st->rx);
kfree(st);
......
......@@ -27,7 +27,7 @@ static inline u16 combine_8_to_16(u8 lower, u8 upper)
return _lower | (_upper << 8);
}
static IIO_SCAN_EL_C(supply, ADIS16300_SCAN_SUPPLY, IIO_SIGNED(14),
static IIO_SCAN_EL_C(supply, ADIS16300_SCAN_SUPPLY, IIO_UNSIGNED(14),
ADIS16300_SUPPLY_OUT, NULL);
static IIO_SCAN_EL_C(gyro_x, ADIS16300_SCAN_GYRO_X, IIO_SIGNED(14),
......@@ -40,9 +40,9 @@ static IIO_SCAN_EL_C(accel_y, ADIS16300_SCAN_ACC_Y, IIO_SIGNED(14),
static IIO_SCAN_EL_C(accel_z, ADIS16300_SCAN_ACC_Z, IIO_SIGNED(14),
ADIS16300_ZACCL_OUT, NULL);
static IIO_SCAN_EL_C(temp, ADIS16300_SCAN_TEMP, IIO_SIGNED(12),
static IIO_SCAN_EL_C(temp, ADIS16300_SCAN_TEMP, IIO_UNSIGNED(12),
ADIS16300_TEMP_OUT, NULL);
static IIO_SCAN_EL_C(adc_0, ADIS16300_SCAN_ADC_0, IIO_SIGNED(12),
static IIO_SCAN_EL_C(adc_0, ADIS16300_SCAN_ADC_0, IIO_UNSIGNED(12),
ADIS16300_AUX_ADC, NULL);
static IIO_SCAN_EL_C(incli_x, ADIS16300_SCAN_INCLI_X, IIO_SIGNED(12),
......@@ -88,6 +88,54 @@ static void adis16300_poll_func_th(struct iio_dev *indio_dev)
*/
}
/**
* adis16300_spi_read_burst() - read all data registers
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @rx: somewhere to pass back the value read (min size is 24 bytes)
**/
static int adis16300_spi_read_burst(struct device *dev, u8 *rx)
{
struct spi_message msg;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct adis16300_state *st = iio_dev_get_devdata(indio_dev);
u32 old_speed_hz = st->us->max_speed_hz;
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 0,
}, {
.rx_buf = rx,
.bits_per_word = 8,
.len = 18,
.cs_change = 0,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16300_READ_REG(ADIS16300_GLOB_CMD);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
st->us->max_speed_hz = ADIS16300_SPI_BURST;
spi_setup(st->us);
ret = spi_sync(st->us, &msg);
if (ret)
dev_err(&st->us->dev, "problem when burst reading");
st->us->max_speed_hz = old_speed_hz;
spi_setup(st->us);
mutex_unlock(&st->buf_lock);
return ret;
}
/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
* specific to be rolled into the core.
*/
......
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