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synced 2024-11-15 16:24:13 +08:00
iio: ltr501: Add support for ltr559 chip
This device is register compatible with LTR501, with a minor difference for
ALS control register as showed below:
ALS Control register for LTR501:
7 6 5 4 3 2 1 0
+------+------+------+------+------+------+------+------+
| | | | |
| Reserved | Gain | SW | ALS Mode |
| | | Reset| |
+------+------+------+------+------+------+------+------+
ALS Control register for LTR559:
7 6 5 4 3 2 1 0
+------+------+------+------+------+------+------+------+
| | | | |
| Reserved | Gain | SW | ALS |
| | | Reset| Mode |
+------+------+------+------+------+------+------+------+
We handle this difference by introducing ltr501_chip_info.
Datasheet for LTR559 is at:
http://optoelectronics.liteon.com/upload/download/DS86-2013-0003/S_110_LTR-559ALS-01_DS_V1.pdf
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta
Jonathan Cameron
parent
772154d0dd
commit
8592a7eefa
@ -169,7 +169,8 @@ config LTR501
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select IIO_TRIGGERED_BUFFER
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help
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If you say yes here you get support for the Lite-On LTR-501ALS-01
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ambient light and proximity sensor.
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ambient light and proximity sensor. This driver also supports LTR-559
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ALS/PS sensor.
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This driver can also be built as a module. If so, the module
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will be called ltr501.
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@ -88,9 +88,63 @@ struct ltr501_samp_table {
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int time_val; /* repetition rate in micro seconds */
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};
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#define LTR501_RESERVED_GAIN -1
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enum {
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ltr501 = 0,
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ltr559,
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};
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struct ltr501_gain {
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int scale;
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int uscale;
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};
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static struct ltr501_gain ltr501_als_gain_tbl[] = {
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{1, 0},
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{0, 5000},
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};
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static struct ltr501_gain ltr559_als_gain_tbl[] = {
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{1, 0},
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{0, 500000},
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{0, 250000},
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{0, 125000},
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{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
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{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},
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{0, 20000},
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{0, 10000},
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};
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static struct ltr501_gain ltr501_ps_gain_tbl[] = {
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{1, 0},
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{0, 250000},
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{0, 125000},
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{0, 62500},
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};
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static struct ltr501_gain ltr559_ps_gain_tbl[] = {
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{0, 62500}, /* x16 gain */
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{0, 31250}, /* x32 gain */
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{0, 15625}, /* bits X1 are for x64 gain */
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{0, 15624},
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};
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struct ltr501_chip_info {
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u8 partid;
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struct ltr501_gain *als_gain;
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int als_gain_tbl_size;
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struct ltr501_gain *ps_gain;
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int ps_gain_tbl_size;
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u8 als_mode_active;
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u8 als_gain_mask;
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u8 als_gain_shift;
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};
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struct ltr501_data {
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struct i2c_client *client;
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struct mutex lock_als, lock_ps;
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struct ltr501_chip_info *chip_info;
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u8 als_contr, ps_contr;
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int als_period, ps_period; /* period in micro seconds */
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struct regmap *regmap;
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@ -516,10 +570,6 @@ static const struct iio_chan_spec ltr501_channels[] = {
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IIO_CHAN_SOFT_TIMESTAMP(3),
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};
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static const int ltr501_ps_gain[4][2] = {
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{1, 0}, {0, 250000}, {0, 125000}, {0, 62500}
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};
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static int ltr501_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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@ -557,19 +607,16 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_INTENSITY:
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if (data->als_contr & LTR501_CONTR_ALS_GAIN_MASK) {
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*val = 0;
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*val2 = 5000;
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i = (data->als_contr & data->chip_info->als_gain_mask)
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>> data->chip_info->als_gain_shift;
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*val = data->chip_info->als_gain[i].scale;
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*val2 = data->chip_info->als_gain[i].uscale;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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*val = 1;
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*val2 = 0;
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return IIO_VAL_INT;
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case IIO_PROXIMITY:
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i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>
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LTR501_CONTR_PS_GAIN_SHIFT;
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*val = ltr501_ps_gain[i][0];
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*val2 = ltr501_ps_gain[i][1];
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*val = data->chip_info->ps_gain[i].scale;
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*val2 = data->chip_info->ps_gain[i].uscale;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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@ -594,12 +641,13 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
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return -EINVAL;
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}
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static int ltr501_get_ps_gain_index(int val, int val2)
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static int ltr501_get_gain_index(struct ltr501_gain *gain, int size,
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int val, int val2)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ltr501_ps_gain); i++)
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if (val == ltr501_ps_gain[i][0] && val2 == ltr501_ps_gain[i][1])
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for (i = 0; i < size; i++)
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if (val == gain[i].scale && val2 == gain[i].uscale)
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return i;
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return -1;
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@ -611,6 +659,7 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
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{
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struct ltr501_data *data = iio_priv(indio_dev);
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int i, ret, freq_val, freq_val2;
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struct ltr501_chip_info *info = data->chip_info;
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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@ -619,17 +668,21 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_INTENSITY:
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if (val == 0 && val2 == 5000)
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data->als_contr |= LTR501_CONTR_ALS_GAIN_MASK;
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else if (val == 1 && val2 == 0)
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data->als_contr &= ~LTR501_CONTR_ALS_GAIN_MASK;
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else
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i = ltr501_get_gain_index(info->als_gain,
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info->als_gain_tbl_size,
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val, val2);
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if (i < 0)
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return -EINVAL;
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data->als_contr &= ~info->als_gain_mask;
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data->als_contr |= i << info->als_gain_shift;
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return regmap_write(data->regmap, LTR501_ALS_CONTR,
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data->als_contr);
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case IIO_PROXIMITY:
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i = ltr501_get_ps_gain_index(val, val2);
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i = ltr501_get_gain_index(info->ps_gain,
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info->ps_gain_tbl_size,
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val, val2);
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if (i < 0)
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return -EINVAL;
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data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
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@ -927,14 +980,61 @@ static int ltr501_write_event_config(struct iio_dev *indio_dev,
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return -EINVAL;
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}
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static IIO_CONST_ATTR(in_proximity_scale_available, "1 0.25 0.125 0.0625");
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static IIO_CONST_ATTR(in_intensity_scale_available, "1 0.005");
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static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
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struct ltr501_chip_info *info = data->chip_info;
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ssize_t len = 0;
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int i;
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for (i = 0; i < info->ps_gain_tbl_size; i++) {
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if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)
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continue;
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len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
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info->ps_gain[i].scale,
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info->ps_gain[i].uscale);
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}
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buf[len - 1] = '\n';
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return len;
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}
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static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));
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struct ltr501_chip_info *info = data->chip_info;
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ssize_t len = 0;
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int i;
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for (i = 0; i < info->als_gain_tbl_size; i++) {
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if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)
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continue;
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len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
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info->als_gain[i].scale,
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info->als_gain[i].uscale);
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}
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buf[len - 1] = '\n';
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return len;
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}
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static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
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static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,
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ltr501_show_proximity_scale_avail, NULL, 0);
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static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,
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ltr501_show_intensity_scale_avail, NULL, 0);
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static struct attribute *ltr501_attributes[] = {
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&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
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&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
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&iio_dev_attr_in_proximity_scale_available.dev_attr.attr,
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&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,
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&iio_const_attr_integration_time_available.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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@ -962,6 +1062,29 @@ static const struct iio_info ltr501_info = {
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.driver_module = THIS_MODULE,
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};
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static struct ltr501_chip_info ltr501_chip_info_tbl[] = {
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[ltr501] = {
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.partid = 0x08,
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.als_gain = ltr501_als_gain_tbl,
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.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),
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.ps_gain = ltr501_ps_gain_tbl,
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.ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),
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.als_mode_active = BIT(0) | BIT(1),
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.als_gain_mask = BIT(3),
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.als_gain_shift = 3,
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},
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[ltr559] = {
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.partid = 0x09,
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.als_gain = ltr559_als_gain_tbl,
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.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),
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.ps_gain = ltr559_ps_gain_tbl,
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.ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),
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.als_mode_active = BIT(1),
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.als_gain_mask = BIT(2) | BIT(3) | BIT(4),
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.als_gain_shift = 2,
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},
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};
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static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)
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{
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int ret;
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@ -1062,7 +1185,7 @@ static int ltr501_init(struct ltr501_data *data)
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if (ret < 0)
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return ret;
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data->als_contr = status | LTR501_CONTR_ACTIVE;
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data->als_contr = ret | data->chip_info->als_mode_active;
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ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);
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if (ret < 0)
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@ -1105,17 +1228,30 @@ static struct regmap_config ltr501_regmap_config = {
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static int ltr501_powerdown(struct ltr501_data *data)
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{
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return ltr501_write_contr(data, data->als_contr & ~LTR501_CONTR_ACTIVE,
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return ltr501_write_contr(data, data->als_contr &
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~data->chip_info->als_mode_active,
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data->ps_contr & ~LTR501_CONTR_ACTIVE);
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}
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static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)
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{
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const struct acpi_device_id *id;
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id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!id)
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return NULL;
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*chip_idx = id->driver_data;
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return dev_name(dev);
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}
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static int ltr501_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ltr501_data *data;
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struct iio_dev *indio_dev;
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struct regmap *regmap;
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int ret, partid;
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int ret, partid, chip_idx = 0;
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const char *name = NULL;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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@ -1186,13 +1322,25 @@ static int ltr501_probe(struct i2c_client *client,
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ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
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if (ret < 0)
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return ret;
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if ((partid >> 4) != 0x8)
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if (id) {
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name = id->name;
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chip_idx = id->driver_data;
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} else if (ACPI_HANDLE(&client->dev)) {
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name = ltr501_match_acpi_device(&client->dev, &chip_idx);
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} else {
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return -ENODEV;
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}
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data->chip_info = <r501_chip_info_tbl[chip_idx];
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if ((partid >> 4) != data->chip_info->partid)
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return -ENODEV;
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = ltr501_channels;
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indio_dev->num_channels = ARRAY_SIZE(ltr501_channels);
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indio_dev->name = LTR501_DRV_NAME;
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indio_dev->name = name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = ltr501_init(data);
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@ -1266,13 +1414,15 @@ static int ltr501_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
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static const struct acpi_device_id ltr_acpi_match[] = {
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{"LTER0501", 0},
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{"LTER0501", ltr501},
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{"LTER0559", ltr559},
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);
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static const struct i2c_device_id ltr501_id[] = {
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{ "ltr501", 0 },
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{ "ltr501", ltr501},
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{ "ltr559", ltr559},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ltr501_id);
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