diff options
Diffstat (limited to 'drivers/iio/light/vcnl4000.c')
| -rw-r--r-- | drivers/iio/light/vcnl4000.c | 114 |
1 files changed, 106 insertions, 8 deletions
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c index a0cd1dcbf935..04fd0d4b6f19 100644 --- a/drivers/iio/light/vcnl4000.c +++ b/drivers/iio/light/vcnl4000.c @@ -1,5 +1,5 @@ /* - * vcnl4000.c - Support for Vishay VCNL4000/4010/4020 combined ambient + * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4200 combined ambient * light and proximity sensor * * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net> @@ -8,13 +8,15 @@ * the GNU General Public License. See the file COPYING in the main * directory of this archive for more details. * - * IIO driver for VCNL4000 (7-bit I2C slave address 0x13) + * IIO driver for: + * VCNL4000/10/20 (7-bit I2C slave address 0x13) + * VCNL4200 (7-bit I2C slave address 0x51) * * TODO: * allow to adjust IR current * proximity threshold and event handling * periodic ALS/proximity measurement (VCNL4010/20) - * interrupts (VCNL4010/20) + * interrupts (VCNL4010/20, VCNL4200) */ #include <linux/module.h> @@ -28,6 +30,7 @@ #define VCNL4000_DRV_NAME "vcnl4000" #define VCNL4000_PROD_ID 0x01 #define VCNL4010_PROD_ID 0x02 /* for VCNL4020, VCNL4010 */ +#define VCNL4200_PROD_ID 0x58 #define VCNL4000_COMMAND 0x80 /* Command register */ #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */ @@ -40,6 +43,12 @@ #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */ #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */ +#define VCNL4200_AL_CONF 0x00 /* Ambient light configuration */ +#define VCNL4200_PS_CONF1 0x03 /* Proximity configuration */ +#define VCNL4200_PS_DATA 0x08 /* Proximity data */ +#define VCNL4200_AL_DATA 0x09 /* Ambient light data */ +#define VCNL4200_DEV_ID 0x0e /* Device ID, slave address and version */ + /* Bit masks for COMMAND register */ #define VCNL4000_AL_RDY BIT(6) /* ALS data ready? */ #define VCNL4000_PS_RDY BIT(5) /* proximity data ready? */ @@ -49,6 +58,14 @@ enum vcnl4000_device_ids { VCNL4000, VCNL4010, + VCNL4200, +}; + +struct vcnl4200_channel { + u8 reg; + ktime_t last_measurement; + ktime_t sampling_rate; + struct mutex lock; }; struct vcnl4000_data { @@ -57,7 +74,9 @@ struct vcnl4000_data { int rev; int al_scale; const struct vcnl4000_chip_spec *chip_spec; - struct mutex lock; + struct mutex vcnl4000_lock; + struct vcnl4200_channel vcnl4200_al; + struct vcnl4200_channel vcnl4200_ps; }; struct vcnl4000_chip_spec { @@ -71,6 +90,7 @@ static const struct i2c_device_id vcnl4000_id[] = { { "vcnl4000", VCNL4000 }, { "vcnl4010", VCNL4010 }, { "vcnl4020", VCNL4010 }, + { "vcnl4200", VCNL4200 }, { } }; MODULE_DEVICE_TABLE(i2c, vcnl4000_id); @@ -101,6 +121,42 @@ static int vcnl4000_init(struct vcnl4000_data *data) data->rev = ret & 0xf; data->al_scale = 250000; + mutex_init(&data->vcnl4000_lock); + + return 0; +}; + +static int vcnl4200_init(struct vcnl4000_data *data) +{ + int ret; + + ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID); + if (ret < 0) + return ret; + + if ((ret & 0xff) != VCNL4200_PROD_ID) + return -ENODEV; + + data->rev = (ret >> 8) & 0xf; + + /* Set defaults and enable both channels */ + ret = i2c_smbus_write_byte_data(data->client, VCNL4200_AL_CONF, 0x00); + if (ret < 0) + return ret; + ret = i2c_smbus_write_byte_data(data->client, VCNL4200_PS_CONF1, 0x00); + if (ret < 0) + return ret; + + data->al_scale = 24000; + data->vcnl4200_al.reg = VCNL4200_AL_DATA; + data->vcnl4200_ps.reg = VCNL4200_PS_DATA; + /* Integration time is 50ms, but the experiments show 54ms in total. */ + data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000); + data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000); + data->vcnl4200_al.last_measurement = ktime_set(0, 0); + data->vcnl4200_ps.last_measurement = ktime_set(0, 0); + mutex_init(&data->vcnl4200_al.lock); + mutex_init(&data->vcnl4200_ps.lock); return 0; }; @@ -112,7 +168,7 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, __be16 buf; int ret; - mutex_lock(&data->lock); + mutex_lock(&data->vcnl4000_lock); ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, req_mask); @@ -141,16 +197,43 @@ static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, if (ret < 0) goto fail; - mutex_unlock(&data->lock); + mutex_unlock(&data->vcnl4000_lock); *val = be16_to_cpu(buf); return 0; fail: - mutex_unlock(&data->lock); + mutex_unlock(&data->vcnl4000_lock); return ret; } +static int vcnl4200_measure(struct vcnl4000_data *data, + struct vcnl4200_channel *chan, int *val) +{ + int ret; + s64 delta; + ktime_t next_measurement; + + mutex_lock(&chan->lock); + + next_measurement = ktime_add(chan->last_measurement, + chan->sampling_rate); + delta = ktime_us_delta(next_measurement, ktime_get()); + if (delta > 0) + usleep_range(delta, delta + 500); + chan->last_measurement = ktime_get(); + + mutex_unlock(&chan->lock); + + ret = i2c_smbus_read_word_data(data->client, chan->reg); + if (ret < 0) + return ret; + + *val = ret; + + return 0; +} + static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val) { return vcnl4000_measure(data, @@ -158,6 +241,11 @@ static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val) VCNL4000_AL_RESULT_HI, val); } +static int vcnl4200_measure_light(struct vcnl4000_data *data, int *val) +{ + return vcnl4200_measure(data, &data->vcnl4200_al, val); +} + static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val) { return vcnl4000_measure(data, @@ -165,6 +253,11 @@ static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val) VCNL4000_PS_RESULT_HI, val); } +static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val) +{ + return vcnl4200_measure(data, &data->vcnl4200_ps, val); +} + static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = { [VCNL4000] = { .prod = "VCNL4000", @@ -178,6 +271,12 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = { .measure_light = vcnl4000_measure_light, .measure_proximity = vcnl4000_measure_proximity, }, + [VCNL4200] = { + .prod = "VCNL4200", + .init = vcnl4200_init, + .measure_light = vcnl4200_measure_light, + .measure_proximity = vcnl4200_measure_proximity, + }, }; static const struct iio_chan_spec vcnl4000_channels[] = { @@ -246,7 +345,6 @@ static int vcnl4000_probe(struct i2c_client *client, data->client = client; data->id = id->driver_data; data->chip_spec = &vcnl4000_chip_spec_cfg[data->id]; - mutex_init(&data->lock); ret = data->chip_spec->init(data); if (ret < 0) |