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iio: ltr501: Add regmap support.
Added regmap support. It will be useful to handle bitwise updates to als & ps control registers. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
parent
a40c0ac108
commit
2f2c96338a
1 changed files with 86 additions and 43 deletions
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@ -16,6 +16,7 @@
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/regmap.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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@ -33,6 +34,7 @@
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#define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
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#define LTR501_ALS_PS_STATUS 0x8c
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#define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
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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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#define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
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@ -45,23 +47,25 @@
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#define LTR501_PS_DATA_MASK 0x7ff
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#define LTR501_REGMAP_NAME "ltr501_regmap"
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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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struct regmap *regmap;
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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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int ret;
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int ret, status;
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while (tries--) {
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ret = i2c_smbus_read_byte_data(data->client,
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LTR501_ALS_PS_STATUS);
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ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
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if (ret < 0)
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return ret;
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if ((ret & drdy_mask) == drdy_mask)
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if ((status & drdy_mask) == drdy_mask)
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return 0;
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msleep(25);
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}
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@ -72,21 +76,30 @@ static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
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static int ltr501_read_als(struct ltr501_data *data, __le16 buf[2])
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{
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int ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
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int ret;
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ret = ltr501_drdy(data, LTR501_STATUS_ALS_RDY);
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if (ret < 0)
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return ret;
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/* always read both ALS channels in given order */
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return i2c_smbus_read_i2c_block_data(data->client,
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LTR501_ALS_DATA1,
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2 * sizeof(__le16), (u8 *)buf);
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return regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
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buf, 2 * sizeof(__le16));
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}
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static int ltr501_read_ps(struct ltr501_data *data)
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{
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int ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
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int ret, status;
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ret = ltr501_drdy(data, LTR501_STATUS_PS_RDY);
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if (ret < 0)
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return ret;
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return i2c_smbus_read_word_data(data->client, LTR501_PS_DATA);
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ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
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&status, 2);
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if (ret < 0)
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return ret;
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return status;
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}
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#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared) { \
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@ -170,11 +183,10 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
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*val = 0;
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*val2 = 5000;
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return IIO_VAL_INT_PLUS_MICRO;
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} else {
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*val = 1;
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*val2 = 0;
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return IIO_VAL_INT;
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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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@ -219,18 +231,18 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
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data->als_contr &= ~LTR501_CONTR_ALS_GAIN_MASK;
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else
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return -EINVAL;
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return i2c_smbus_write_byte_data(data->client,
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LTR501_ALS_CONTR,
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data->als_contr);
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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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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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data->ps_contr |= i << LTR501_CONTR_PS_GAIN_SHIFT;
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return i2c_smbus_write_byte_data(data->client,
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LTR501_PS_CONTR,
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data->ps_contr);
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return regmap_write(data->regmap, LTR501_PS_CONTR,
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data->ps_contr);
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default:
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return -EINVAL;
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}
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@ -258,13 +270,15 @@ static const struct iio_info ltr501_info = {
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.driver_module = THIS_MODULE,
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};
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static int ltr501_write_contr(struct i2c_client *client, u8 als_val, u8 ps_val)
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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 = i2c_smbus_write_byte_data(client, LTR501_ALS_CONTR, als_val);
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int ret;
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ret = regmap_write(data->regmap, LTR501_ALS_CONTR, als_val);
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if (ret < 0)
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return ret;
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return i2c_smbus_write_byte_data(client, LTR501_PS_CONTR, ps_val);
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return regmap_write(data->regmap, LTR501_PS_CONTR, ps_val);
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}
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static irqreturn_t ltr501_trigger_handler(int irq, void *p)
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@ -276,7 +290,7 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p)
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__le16 als_buf[2];
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u8 mask = 0;
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int j = 0;
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int ret;
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int ret, psdata;
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memset(buf, 0, sizeof(buf));
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@ -292,10 +306,8 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p)
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goto done;
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if (mask & LTR501_STATUS_ALS_RDY) {
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ret = i2c_smbus_read_i2c_block_data(data->client,
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LTR501_ALS_DATA1,
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sizeof(als_buf),
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(u8 *)als_buf);
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ret = regmap_bulk_read(data->regmap, LTR501_ALS_DATA1,
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(u8 *)als_buf, sizeof(als_buf));
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if (ret < 0)
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return ret;
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if (test_bit(0, indio_dev->active_scan_mask))
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@ -305,10 +317,11 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p)
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}
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if (mask & LTR501_STATUS_PS_RDY) {
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ret = i2c_smbus_read_word_data(data->client, LTR501_PS_DATA);
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ret = regmap_bulk_read(data->regmap, LTR501_PS_DATA,
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&psdata, 2);
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if (ret < 0)
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goto done;
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buf[j++] = ret & LTR501_PS_DATA_MASK;
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buf[j++] = psdata & LTR501_PS_DATA_MASK;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
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@ -321,26 +334,48 @@ static irqreturn_t ltr501_trigger_handler(int irq, void *p)
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static int ltr501_init(struct ltr501_data *data)
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{
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int ret;
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int ret, status;
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ret = i2c_smbus_read_byte_data(data->client, LTR501_ALS_CONTR);
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ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
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if (ret < 0)
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return ret;
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data->als_contr = ret | LTR501_CONTR_ACTIVE;
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ret = i2c_smbus_read_byte_data(data->client, LTR501_PS_CONTR);
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data->als_contr = status | LTR501_CONTR_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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return ret;
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data->ps_contr = ret | LTR501_CONTR_ACTIVE;
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return ltr501_write_contr(data->client, data->als_contr,
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data->ps_contr);
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data->ps_contr = status | LTR501_CONTR_ACTIVE;
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return ltr501_write_contr(data, data->als_contr, data->ps_contr);
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}
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static bool ltr501_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LTR501_ALS_DATA1:
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case LTR501_ALS_DATA0:
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case LTR501_ALS_PS_STATUS:
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case LTR501_PS_DATA:
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return true;
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default:
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return false;
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}
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}
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static struct regmap_config ltr501_regmap_config = {
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.name = LTR501_REGMAP_NAME,
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LTR501_MAX_REG,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = ltr501_is_volatile_reg,
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};
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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->client,
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data->als_contr & ~LTR501_CONTR_ACTIVE,
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return ltr501_write_contr(data, data->als_contr & ~LTR501_CONTR_ACTIVE,
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data->ps_contr & ~LTR501_CONTR_ACTIVE);
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}
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@ -349,22 +384,30 @@ static int ltr501_probe(struct i2c_client *client,
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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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int ret;
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struct regmap *regmap;
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int ret, partid;
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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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return -ENOMEM;
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regmap = devm_regmap_init_i2c(client, <r501_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->dev, "Regmap initialization failed.\n");
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return PTR_ERR(regmap);
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}
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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data->regmap = regmap;
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mutex_init(&data->lock_als);
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mutex_init(&data->lock_ps);
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ret = i2c_smbus_read_byte_data(data->client, LTR501_PART_ID);
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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 ((ret >> 4) != 0x8)
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if ((partid >> 4) != 0x8)
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return -ENODEV;
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indio_dev->dev.parent = &client->dev;
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struct ltr501_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return ltr501_write_contr(data->client, data->als_contr,
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return ltr501_write_contr(data, data->als_contr,
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data->ps_contr);
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}
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#endif
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