forked from Minki/linux
iio: ltr501: Add interrupt rate control support
Added rate control support for ALS and proximity threshold interrupts.Also, Added support to modify and read ALS & proximity sensor sampling frequency. LTR-501 supports interrupt rate control using persistence register settings. Writing <n> to persistence register would generate interrupt only if there are <n> consecutive data values outside the threshold range. Since we don't have any existing ABI's to directly control the persistence register count, we have implemented the rate control using IIO_EV_INFO_PERIOD. _period event attribute represents the amount of time in seconds an event should be true for the device to generate the interrupt. So using _period value and device frequency, persistence count is calculated in driver using following logic. count = period / measurement_rate If the given period is not a multiple of measurement rate then we round up the value to next multiple. This patch also handles change to persistence count whenever there is change in frequency. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Kuppuswamy Sathyanarayanan
Jonathan Cameron
parent
7ac702b314
commit
eea53b4a25
@ -9,7 +9,7 @@
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*
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* 7-bit I2C slave address 0x23
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*
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* TODO: measurement rate, IR LED characteristics
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* TODO: IR LED characteristics
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*/
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#include <linux/module.h>
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@ -29,6 +29,7 @@
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#define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
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#define LTR501_PS_CONTR 0x81 /* PS operation mode */
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#define LTR501_PS_MEAS_RATE 0x84 /* measurement rate*/
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#define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
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#define LTR501_PART_ID 0x86
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#define LTR501_MANUFAC_ID 0x87
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@ -41,6 +42,7 @@
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#define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
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#define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
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#define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
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#define LTR501_INTR_PRST 0x9e /* ps thresh, als thresh */
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#define LTR501_MAX_REG 0x9f
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#define LTR501_ALS_CONTR_SW_RESET BIT(2)
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@ -58,6 +60,9 @@
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#define LTR501_PS_THRESH_MASK 0x7ff
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#define LTR501_ALS_THRESH_MASK 0xffff
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#define LTR501_ALS_DEF_PERIOD 500000
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#define LTR501_PS_DEF_PERIOD 100000
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#define LTR501_REGMAP_NAME "ltr501_regmap"
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static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
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@ -68,17 +73,171 @@ static const struct reg_field reg_field_als_intr =
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REG_FIELD(LTR501_INTR, 0, 0);
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static const struct reg_field reg_field_ps_intr =
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REG_FIELD(LTR501_INTR, 1, 1);
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static const struct reg_field reg_field_als_rate =
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REG_FIELD(LTR501_ALS_MEAS_RATE, 0, 2);
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static const struct reg_field reg_field_ps_rate =
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REG_FIELD(LTR501_PS_MEAS_RATE, 0, 3);
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static const struct reg_field reg_field_als_prst =
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REG_FIELD(LTR501_INTR_PRST, 0, 3);
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static const struct reg_field reg_field_ps_prst =
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REG_FIELD(LTR501_INTR_PRST, 4, 7);
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struct ltr501_samp_table {
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int freq_val; /* repetition frequency in micro HZ*/
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int time_val; /* repetition rate in micro seconds */
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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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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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struct regmap_field *reg_it;
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struct regmap_field *reg_als_intr;
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struct regmap_field *reg_ps_intr;
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struct regmap_field *reg_als_rate;
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struct regmap_field *reg_ps_rate;
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struct regmap_field *reg_als_prst;
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struct regmap_field *reg_ps_prst;
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};
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static const struct ltr501_samp_table ltr501_als_samp_table[] = {
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{20000000, 50000}, {10000000, 100000},
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{5000000, 200000}, {2000000, 500000},
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{1000000, 1000000}, {500000, 2000000},
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{500000, 2000000}, {500000, 2000000}
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};
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static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
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{20000000, 50000}, {14285714, 70000},
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{10000000, 100000}, {5000000, 200000},
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{2000000, 500000}, {1000000, 1000000},
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{500000, 2000000}, {500000, 2000000},
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{500000, 2000000}
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};
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static unsigned int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
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int len, int val, int val2)
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{
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int i, freq;
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freq = val * 1000000 + val2;
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for (i = 0; i < len; i++) {
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if (tab[i].freq_val == freq)
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return i;
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}
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return -EINVAL;
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}
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static int ltr501_als_read_samp_freq(struct ltr501_data *data,
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int *val, int *val2)
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{
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int ret, i;
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ret = regmap_field_read(data->reg_als_rate, &i);
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if (ret < 0)
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return ret;
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if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
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return -EINVAL;
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*val = ltr501_als_samp_table[i].freq_val / 1000000;
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*val2 = ltr501_als_samp_table[i].freq_val % 1000000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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static int ltr501_ps_read_samp_freq(struct ltr501_data *data,
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int *val, int *val2)
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{
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int ret, i;
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ret = regmap_field_read(data->reg_ps_rate, &i);
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if (ret < 0)
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return ret;
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if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
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return -EINVAL;
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*val = ltr501_ps_samp_table[i].freq_val / 1000000;
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*val2 = ltr501_ps_samp_table[i].freq_val % 1000000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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static int ltr501_als_write_samp_freq(struct ltr501_data *data,
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int val, int val2)
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{
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int i, ret;
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i = ltr501_match_samp_freq(ltr501_als_samp_table,
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ARRAY_SIZE(ltr501_als_samp_table),
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val, val2);
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if (i < 0)
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return i;
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mutex_lock(&data->lock_als);
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ret = regmap_field_write(data->reg_als_rate, i);
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mutex_unlock(&data->lock_als);
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return ret;
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}
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static int ltr501_ps_write_samp_freq(struct ltr501_data *data,
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int val, int val2)
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{
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int i, ret;
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i = ltr501_match_samp_freq(ltr501_ps_samp_table,
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ARRAY_SIZE(ltr501_ps_samp_table),
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val, val2);
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if (i < 0)
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return i;
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mutex_lock(&data->lock_ps);
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ret = regmap_field_write(data->reg_ps_rate, i);
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mutex_unlock(&data->lock_ps);
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return ret;
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}
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static int ltr501_als_read_samp_period(struct ltr501_data *data, int *val)
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{
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int ret, i;
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ret = regmap_field_read(data->reg_als_rate, &i);
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if (ret < 0)
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return ret;
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if (i < 0 || i >= ARRAY_SIZE(ltr501_als_samp_table))
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return -EINVAL;
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*val = ltr501_als_samp_table[i].time_val;
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return IIO_VAL_INT;
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}
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static int ltr501_ps_read_samp_period(struct ltr501_data *data, int *val)
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{
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int ret, i;
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ret = regmap_field_read(data->reg_ps_rate, &i);
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if (ret < 0)
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return ret;
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if (i < 0 || i >= ARRAY_SIZE(ltr501_ps_samp_table))
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return -EINVAL;
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*val = ltr501_ps_samp_table[i].time_val;
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return IIO_VAL_INT;
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}
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static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
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{
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int tries = 100;
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@ -177,6 +336,104 @@ static int ltr501_read_ps(struct ltr501_data *data)
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return status;
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}
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static int ltr501_read_intr_prst(struct ltr501_data *data,
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enum iio_chan_type type,
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int *val2)
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{
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int ret, samp_period, prst;
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switch (type) {
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case IIO_INTENSITY:
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ret = regmap_field_read(data->reg_als_prst, &prst);
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if (ret < 0)
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return ret;
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ret = ltr501_als_read_samp_period(data, &samp_period);
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if (ret < 0)
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return ret;
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*val2 = samp_period * prst;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_PROXIMITY:
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ret = regmap_field_read(data->reg_ps_prst, &prst);
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if (ret < 0)
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return ret;
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ret = ltr501_ps_read_samp_period(data, &samp_period);
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if (ret < 0)
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return ret;
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*val2 = samp_period * prst;
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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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}
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return -EINVAL;
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}
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static int ltr501_write_intr_prst(struct ltr501_data *data,
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enum iio_chan_type type,
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int val, int val2)
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{
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int ret, samp_period, new_val;
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unsigned long period;
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if (val < 0 || val2 < 0)
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return -EINVAL;
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/* period in microseconds */
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period = ((val * 1000000) + val2);
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switch (type) {
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case IIO_INTENSITY:
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ret = ltr501_als_read_samp_period(data, &samp_period);
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if (ret < 0)
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return ret;
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/* period should be atleast equal to sampling period */
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if (period < samp_period)
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return -EINVAL;
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new_val = DIV_ROUND_UP(period, samp_period);
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if (new_val < 0 || new_val > 0x0f)
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return -EINVAL;
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mutex_lock(&data->lock_als);
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ret = regmap_field_write(data->reg_als_prst, new_val);
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mutex_unlock(&data->lock_als);
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if (ret >= 0)
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data->als_period = period;
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return ret;
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case IIO_PROXIMITY:
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ret = ltr501_ps_read_samp_period(data, &samp_period);
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if (ret < 0)
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return ret;
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/* period should be atleast equal to rate */
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if (period < samp_period)
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return -EINVAL;
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new_val = DIV_ROUND_UP(period, samp_period);
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if (new_val < 0 || new_val > 0x0f)
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return -EINVAL;
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mutex_lock(&data->lock_ps);
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ret = regmap_field_write(data->reg_ps_prst, new_val);
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mutex_unlock(&data->lock_ps);
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if (ret >= 0)
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data->ps_period = period;
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return ret;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static const struct iio_event_spec ltr501_als_event_spec[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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@ -189,7 +446,8 @@ static const struct iio_event_spec ltr501_als_event_spec[] = {
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_ENABLE),
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.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
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BIT(IIO_EV_INFO_PERIOD),
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},
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};
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@ -206,7 +464,8 @@ static const struct iio_event_spec ltr501_pxs_event_spec[] = {
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_ENABLE),
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.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
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BIT(IIO_EV_INFO_PERIOD),
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},
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};
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@ -235,7 +494,8 @@ static const struct iio_chan_spec ltr501_channels[] = {
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ARRAY_SIZE(ltr501_als_event_spec)),
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LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME),
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BIT(IIO_CHAN_INFO_INT_TIME) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ),
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NULL, 0),
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{
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.type = IIO_PROXIMITY,
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@ -320,6 +580,15 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SAMP_FREQ:
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switch (chan->type) {
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case IIO_INTENSITY:
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return ltr501_als_read_samp_freq(data, val, val2);
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case IIO_PROXIMITY:
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return ltr501_ps_read_samp_freq(data, val, val2);
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default:
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return -EINVAL;
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}
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}
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return -EINVAL;
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}
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@ -340,7 +609,7 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
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int val, int val2, long mask)
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{
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struct ltr501_data *data = iio_priv(indio_dev);
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int i;
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int i, ret, freq_val, freq_val2;
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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@ -382,6 +651,49 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SAMP_FREQ:
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switch (chan->type) {
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case IIO_INTENSITY:
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ret = ltr501_als_read_samp_freq(data, &freq_val,
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&freq_val2);
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if (ret < 0)
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return ret;
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ret = ltr501_als_write_samp_freq(data, val, val2);
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if (ret < 0)
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return ret;
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/* update persistence count when changing frequency */
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ret = ltr501_write_intr_prst(data, chan->type,
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0, data->als_period);
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if (ret < 0)
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return ltr501_als_write_samp_freq(data,
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freq_val,
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freq_val2);
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return ret;
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case IIO_PROXIMITY:
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ret = ltr501_ps_read_samp_freq(data, &freq_val,
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&freq_val2);
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if (ret < 0)
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return ret;
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ret = ltr501_ps_write_samp_freq(data, val, val2);
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if (ret < 0)
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return ret;
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/* update persistence count when changing frequency */
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ret = ltr501_write_intr_prst(data, chan->type,
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0, data->ps_period);
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if (ret < 0)
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return ltr501_ps_write_samp_freq(data,
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freq_val,
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freq_val2);
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return ret;
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default:
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return -EINVAL;
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}
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}
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return -EINVAL;
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}
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@ -509,6 +821,55 @@ static int ltr501_write_thresh(struct iio_dev *indio_dev,
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return -EINVAL;
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}
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static int ltr501_read_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int *val, int *val2)
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{
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int ret;
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switch (info) {
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case IIO_EV_INFO_VALUE:
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return ltr501_read_thresh(indio_dev, chan, type, dir,
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info, val, val2);
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case IIO_EV_INFO_PERIOD:
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ret = ltr501_read_intr_prst(iio_priv(indio_dev),
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chan->type, val2);
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*val = *val2 / 1000000;
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*val2 = *val2 % 1000000;
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return ret;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static int ltr501_write_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int val, int val2)
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{
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switch (info) {
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case IIO_EV_INFO_VALUE:
|
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if (val2 != 0)
|
||||
return -EINVAL;
|
||||
return ltr501_write_thresh(indio_dev, chan, type, dir,
|
||||
info, val, val2);
|
||||
case IIO_EV_INFO_PERIOD:
|
||||
return ltr501_write_intr_prst(iio_priv(indio_dev), chan->type,
|
||||
val, val2);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int ltr501_read_event_config(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
enum iio_event_type type,
|
||||
@ -568,11 +929,13 @@ static int ltr501_write_event_config(struct iio_dev *indio_dev,
|
||||
static IIO_CONST_ATTR(in_proximity_scale_available, "1 0.25 0.125 0.0625");
|
||||
static IIO_CONST_ATTR(in_intensity_scale_available, "1 0.005");
|
||||
static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
|
||||
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");
|
||||
|
||||
static struct attribute *ltr501_attributes[] = {
|
||||
&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
|
||||
&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
|
||||
&iio_const_attr_integration_time_available.dev_attr.attr,
|
||||
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
@ -591,8 +954,8 @@ static const struct iio_info ltr501_info = {
|
||||
.read_raw = ltr501_read_raw,
|
||||
.write_raw = ltr501_write_raw,
|
||||
.attrs = <r501_attribute_group,
|
||||
.read_event_value = <r501_read_thresh,
|
||||
.write_event_value = <r501_write_thresh,
|
||||
.read_event_value = <r501_read_event,
|
||||
.write_event_value = <r501_write_event,
|
||||
.read_event_config = <r501_read_event_config,
|
||||
.write_event_config = <r501_write_event_config,
|
||||
.driver_module = THIS_MODULE,
|
||||
@ -706,6 +1069,14 @@ static int ltr501_init(struct ltr501_data *data)
|
||||
|
||||
data->ps_contr = status | LTR501_CONTR_ACTIVE;
|
||||
|
||||
ret = ltr501_read_intr_prst(data, IIO_INTENSITY, &data->als_period);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = ltr501_read_intr_prst(data, IIO_PROXIMITY, &data->ps_period);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return ltr501_write_contr(data, data->als_contr, data->ps_contr);
|
||||
}
|
||||
|
||||
@ -783,6 +1154,34 @@ static int ltr501_probe(struct i2c_client *client,
|
||||
return PTR_ERR(data->reg_ps_intr);
|
||||
}
|
||||
|
||||
data->reg_als_rate = devm_regmap_field_alloc(&client->dev, regmap,
|
||||
reg_field_als_rate);
|
||||
if (IS_ERR(data->reg_als_rate)) {
|
||||
dev_err(&client->dev, "ALS samp rate field init failed.\n");
|
||||
return PTR_ERR(data->reg_als_rate);
|
||||
}
|
||||
|
||||
data->reg_ps_rate = devm_regmap_field_alloc(&client->dev, regmap,
|
||||
reg_field_ps_rate);
|
||||
if (IS_ERR(data->reg_ps_rate)) {
|
||||
dev_err(&client->dev, "PS samp rate field init failed.\n");
|
||||
return PTR_ERR(data->reg_ps_rate);
|
||||
}
|
||||
|
||||
data->reg_als_prst = devm_regmap_field_alloc(&client->dev, regmap,
|
||||
reg_field_als_prst);
|
||||
if (IS_ERR(data->reg_als_prst)) {
|
||||
dev_err(&client->dev, "ALS prst reg field init failed\n");
|
||||
return PTR_ERR(data->reg_als_prst);
|
||||
}
|
||||
|
||||
data->reg_ps_prst = devm_regmap_field_alloc(&client->dev, regmap,
|
||||
reg_field_ps_prst);
|
||||
if (IS_ERR(data->reg_ps_prst)) {
|
||||
dev_err(&client->dev, "PS prst reg field init failed.\n");
|
||||
return PTR_ERR(data->reg_ps_prst);
|
||||
}
|
||||
|
||||
ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user