diff options
Diffstat (limited to 'drivers/staging/iio/accel/kxsd9.c')
-rw-r--r-- | drivers/staging/iio/accel/kxsd9.c | 270 |
1 files changed, 107 insertions, 163 deletions
diff --git a/drivers/staging/iio/accel/kxsd9.c b/drivers/staging/iio/accel/kxsd9.c index c8a358a5df87..5238503f6805 100644 --- a/drivers/staging/iio/accel/kxsd9.c +++ b/drivers/staging/iio/accel/kxsd9.c @@ -21,11 +21,10 @@ #include <linux/spi/spi.h> #include <linux/sysfs.h> #include <linux/slab.h> +#include <linux/module.h> #include "../iio.h" #include "../sysfs.h" -#include "../adc/adc.h" -#include "accel.h" #define KXSD9_REG_X 0x00 #define KXSD9_REG_Y 0x02 @@ -34,10 +33,6 @@ #define KXSD9_REG_RESET 0x0a #define KXSD9_REG_CTRL_C 0x0c -#define KXSD9_FS_8 0x00 -#define KXSD9_FS_6 0x01 -#define KXSD9_FS_4 0x02 -#define KXSD9_FS_2 0x03 #define KXSD9_FS_MASK 0x03 #define KXSD9_REG_CTRL_B 0x0d @@ -46,13 +41,8 @@ #define KXSD9_READ(a) (0x80 | (a)) #define KXSD9_WRITE(a) (a) -#define KXSD9_SCALE_2G "0.011978" -#define KXSD9_SCALE_4G "0.023927" -#define KXSD9_SCALE_6G "0.035934" -#define KXSD9_SCALE_8G "0.047853" - #define KXSD9_STATE_RX_SIZE 2 -#define KXSD9_STATE_TX_SIZE 4 +#define KXSD9_STATE_TX_SIZE 2 /** * struct kxsd9_state - device related storage * @buf_lock: protect the rx and tx buffers. @@ -67,170 +57,70 @@ struct kxsd9_state { u8 tx[KXSD9_STATE_TX_SIZE]; }; -/* This may want to move to mili g to allow for non integer ranges */ -static ssize_t kxsd9_read_scale(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - int ret; - ssize_t len = 0; - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct kxsd9_state *st = iio_priv(indio_dev); - struct spi_transfer xfer = { - .bits_per_word = 8, - .len = 2, - .cs_change = 1, - .tx_buf = st->tx, - .rx_buf = st->rx, - }; - struct spi_message msg; - - mutex_lock(&st->buf_lock); - st->tx[0] = KXSD9_READ(KXSD9_REG_CTRL_C); - st->tx[1] = 0; - spi_message_init(&msg); - spi_message_add_tail(&xfer, &msg); - ret = spi_sync(st->us, &msg); - if (ret) - goto error_ret; - - switch (st->rx[1] & KXSD9_FS_MASK) { - case KXSD9_FS_8: - len += sprintf(buf, "%s\n", KXSD9_SCALE_8G); - break; - case KXSD9_FS_6: - len += sprintf(buf, "%s\n", KXSD9_SCALE_6G); - break; - case KXSD9_FS_4: - len += sprintf(buf, "%s\n", KXSD9_SCALE_4G); - break; - case KXSD9_FS_2: - len += sprintf(buf, "%s\n", KXSD9_SCALE_2G); - break; - } +#define KXSD9_SCALE_2G "0.011978" +#define KXSD9_SCALE_4G "0.023927" +#define KXSD9_SCALE_6G "0.035934" +#define KXSD9_SCALE_8G "0.047853" -error_ret: - mutex_unlock(&st->buf_lock); +/* reverse order */ +static const int kxsd9_micro_scales[4] = { 47853, 35934, 23927, 11978 }; - return ret ? ret : len; -} -static ssize_t kxsd9_write_scale(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) +static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro) { - - struct spi_message msg; - int ret; - struct iio_dev *indio_dev = dev_get_drvdata(dev); + int ret, i; struct kxsd9_state *st = iio_priv(indio_dev); - u8 val; - struct spi_transfer xfers[] = { - { - .bits_per_word = 8, - .len = 2, - .cs_change = 1, - .tx_buf = st->tx, - .rx_buf = st->rx, - }, { - .bits_per_word = 8, - .len = 2, - .cs_change = 1, - .tx_buf = st->tx, - }, - }; - - if (!strncmp(buf, KXSD9_SCALE_8G, - strlen(buf) < strlen(KXSD9_SCALE_8G) - ? strlen(buf) : strlen(KXSD9_SCALE_8G))) - val = KXSD9_FS_8; - else if (!strncmp(buf, KXSD9_SCALE_6G, - strlen(buf) < strlen(KXSD9_SCALE_6G) - ? strlen(buf) : strlen(KXSD9_SCALE_6G))) - val = KXSD9_FS_6; - else if (!strncmp(buf, KXSD9_SCALE_4G, - strlen(buf) < strlen(KXSD9_SCALE_4G) - ? strlen(buf) : strlen(KXSD9_SCALE_4G))) - val = KXSD9_FS_4; - else if (!strncmp(buf, KXSD9_SCALE_2G, - strlen(buf) < strlen(KXSD9_SCALE_2G) - ? strlen(buf) : strlen(KXSD9_SCALE_2G))) - val = KXSD9_FS_2; - else + bool foundit = false; + + for (i = 0; i < 4; i++) + if (micro == kxsd9_micro_scales[i]) { + foundit = true; + break; + } + if (!foundit) return -EINVAL; mutex_lock(&st->buf_lock); - st->tx[0] = KXSD9_READ(KXSD9_REG_CTRL_C); - st->tx[1] = 0; - spi_message_init(&msg); - spi_message_add_tail(&xfers[0], &msg); - ret = spi_sync(st->us, &msg); + ret = spi_w8r8(st->us, KXSD9_READ(KXSD9_REG_CTRL_C)); if (ret) goto error_ret; st->tx[0] = KXSD9_WRITE(KXSD9_REG_CTRL_C); - st->tx[1] = (st->rx[1] & ~KXSD9_FS_MASK) | val; + st->tx[1] = (ret & ~KXSD9_FS_MASK) | i; - spi_message_init(&msg); - spi_message_add_tail(&xfers[1], &msg); - ret = spi_sync(st->us, &msg); + ret = spi_write(st->us, st->tx, 2); error_ret: mutex_unlock(&st->buf_lock); - return ret ? ret : len; + return ret; } -static ssize_t kxsd9_read_accel(struct device *dev, - struct device_attribute *attr, - char *buf) +static int kxsd9_read(struct iio_dev *indio_dev, u8 address) { struct spi_message msg; int ret; - ssize_t len = 0; - u16 val; - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - struct iio_dev *indio_dev = dev_get_drvdata(dev); struct kxsd9_state *st = iio_priv(indio_dev); struct spi_transfer xfers[] = { { .bits_per_word = 8, .len = 1, - .cs_change = 0, .delay_usecs = 200, .tx_buf = st->tx, }, { .bits_per_word = 8, .len = 2, - .cs_change = 1, .rx_buf = st->rx, }, }; mutex_lock(&st->buf_lock); - st->tx[0] = KXSD9_READ(this_attr->address); + st->tx[0] = KXSD9_READ(address); spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); spi_message_add_tail(&xfers[1], &msg); ret = spi_sync(st->us, &msg); if (ret) - goto error_ret; - val = (((u16)(st->rx[0])) << 8) | (st->rx[1] & 0xF0); - len = sprintf(buf, "%d\n", val); -error_ret: - mutex_unlock(&st->buf_lock); - - return ret ? ret : len; + return ret; + return (((u16)(st->rx[0])) << 8) | (st->rx[1] & 0xF0); } -static IIO_DEV_ATTR_ACCEL_X(kxsd9_read_accel, KXSD9_REG_X); -static IIO_DEV_ATTR_ACCEL_Y(kxsd9_read_accel, KXSD9_REG_Y); -static IIO_DEV_ATTR_ACCEL_Z(kxsd9_read_accel, KXSD9_REG_Z); -static IIO_DEV_ATTR_IN_RAW(0, kxsd9_read_accel, KXSD9_REG_AUX); - -static IIO_DEVICE_ATTR(accel_scale, - S_IRUGO | S_IWUSR, - kxsd9_read_scale, - kxsd9_write_scale, - 0); - static IIO_CONST_ATTR(accel_scale_available, KXSD9_SCALE_2G " " KXSD9_SCALE_4G " " @@ -238,48 +128,94 @@ static IIO_CONST_ATTR(accel_scale_available, KXSD9_SCALE_8G); static struct attribute *kxsd9_attributes[] = { - &iio_dev_attr_accel_x_raw.dev_attr.attr, - &iio_dev_attr_accel_y_raw.dev_attr.attr, - &iio_dev_attr_accel_z_raw.dev_attr.attr, - &iio_dev_attr_in0_raw.dev_attr.attr, - &iio_dev_attr_accel_scale.dev_attr.attr, &iio_const_attr_accel_scale_available.dev_attr.attr, NULL, }; +static int kxsd9_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + int ret = -EINVAL; + + if (mask == (1 << IIO_CHAN_INFO_SCALE_SHARED)) { + /* Check no integer component */ + if (val) + return -EINVAL; + ret = kxsd9_write_scale(indio_dev, val2); + } + + return ret; +} + +static int kxsd9_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + int ret = -EINVAL; + struct kxsd9_state *st = iio_priv(indio_dev); + + switch (mask) { + case 0: + ret = kxsd9_read(indio_dev, chan->address); + if (ret < 0) + goto error_ret; + *val = ret; + break; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + ret = spi_w8r8(st->us, KXSD9_READ(KXSD9_REG_CTRL_C)); + if (ret) + goto error_ret; + *val2 = kxsd9_micro_scales[ret & KXSD9_FS_MASK]; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + }; + +error_ret: + return ret; +}; +#define KXSD9_ACCEL_CHAN(axis) \ + { \ + .type = IIO_ACCEL, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask = 1 << IIO_CHAN_INFO_SCALE_SHARED, \ + .address = KXSD9_REG_##axis, \ + } + +static struct iio_chan_spec kxsd9_channels[] = { + KXSD9_ACCEL_CHAN(X), KXSD9_ACCEL_CHAN(Y), KXSD9_ACCEL_CHAN(Z), + { + .type = IIO_VOLTAGE, + .indexed = 1, + .address = KXSD9_REG_AUX, + } +}; + static const struct attribute_group kxsd9_attribute_group = { .attrs = kxsd9_attributes, }; static int __devinit kxsd9_power_up(struct kxsd9_state *st) { - struct spi_transfer xfers[2] = { - { - .bits_per_word = 8, - .len = 2, - .cs_change = 1, - .tx_buf = st->tx, - }, { - .bits_per_word = 8, - .len = 2, - .cs_change = 1, - .tx_buf = st->tx + 2, - }, - }; - struct spi_message msg; + int ret; + st->tx[0] = 0x0d; st->tx[1] = 0x40; - st->tx[2] = 0x0c; - st->tx[3] = 0x9b; - - spi_message_init(&msg); - spi_message_add_tail(&xfers[0], &msg); - spi_message_add_tail(&xfers[1], &msg); + ret = spi_write(st->us, st->tx, 2); + if (ret) + return ret; - return spi_sync(st->us, &msg); + st->tx[0] = 0x0c; + st->tx[1] = 0x9b; + return spi_write(st->us, st->tx, 2); }; static const struct iio_info kxsd9_info = { + .read_raw = &kxsd9_read_raw, + .write_raw = &kxsd9_write_raw, .attrs = &kxsd9_attribute_group, .driver_module = THIS_MODULE, }; @@ -300,7 +236,9 @@ static int __devinit kxsd9_probe(struct spi_device *spi) st->us = spi; mutex_init(&st->buf_lock); - + indio_dev->channels = kxsd9_channels; + indio_dev->num_channels = ARRAY_SIZE(kxsd9_channels); + indio_dev->name = spi_get_device_id(spi)->name; indio_dev->dev.parent = &spi->dev; indio_dev->info = &kxsd9_info; indio_dev->modes = INDIO_DIRECT_MODE; @@ -324,10 +262,15 @@ error_ret: static int __devexit kxsd9_remove(struct spi_device *spi) { iio_device_unregister(spi_get_drvdata(spi)); + iio_free_device(spi_get_drvdata(spi)); return 0; } +static const struct spi_device_id kxsd9_id[] = { + {"kxsd9", 0} +}; + static struct spi_driver kxsd9_driver = { .driver = { .name = "kxsd9", @@ -335,6 +278,7 @@ static struct spi_driver kxsd9_driver = { }, .probe = kxsd9_probe, .remove = __devexit_p(kxsd9_remove), + .id_table = kxsd9_id, }; static __init int kxsd9_spi_init(void) |