From 3b424f33d7a3f1f4f928845d4f6f6bdf8f577205 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 2 Sep 2011 17:25:39 +0100 Subject: [PATCH] staging:iio:adc:ad7291: Add regulator, reference voltage and scale handling Signed-off-by: Michael Hennerich Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/ad7291.c | 61 ++++++++++++++++++++++++++++++++++------ 1 file changed, 52 insertions(+), 9 deletions(-) diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c index b34af69..84c638d 100644 --- a/drivers/staging/iio/adc/ad7291.c +++ b/drivers/staging/iio/adc/ad7291.c @@ -14,6 +14,8 @@ #include #include #include +#include +#include #include "../iio.h" #include "../sysfs.h" @@ -27,8 +29,8 @@ * * The noise-delayed bit as per datasheet suggestion is always enabled. * - * Extref control should be based on regulator provision - not handled. */ + /* * AD7291 registers definition */ @@ -61,16 +63,21 @@ * AD7291 value masks */ #define AD7291_CHANNEL_MASK 0xF000 +#define AD7291_BITS 12 #define AD7291_VALUE_MASK 0xFFF #define AD7291_T_VALUE_SIGN 0x400 #define AD7291_T_VALUE_FLOAT_OFFSET 2 #define AD7291_T_VALUE_FLOAT_MASK 0x2 +#define AD7291_BITS 12 + struct ad7291_chip_info { - struct i2c_client *client; - u16 command; - u8 c_mask; /* Active voltage channels for events */ - struct mutex state_lock; + struct i2c_client *client; + struct regulator *reg; + u16 int_vref_mv; + u16 command; + u8 c_mask; /* Active voltage channels for events */ + struct mutex state_lock; }; static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data) @@ -420,6 +427,7 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, { int ret; struct ad7291_chip_info *chip = iio_priv(indio_dev); + unsigned int scale_uv; u16 regval; s16 signval; @@ -471,6 +479,11 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, signval = (s16)((swab16((u16)ret) & 0x0FFF) << 4) >> 4; *val = signval; return IIO_VAL_INT; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS; + *val = scale_uv / 1000; + *val2 = (scale_uv % 1000) * 1000; + return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } @@ -479,6 +492,7 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, #define AD7291_VOLTAGE_CHAN(_chan) \ { \ .type = IIO_VOLTAGE, \ + .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \ .indexed = 1, \ .channel = _chan, \ .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)|\ @@ -524,7 +538,7 @@ static int __devinit ad7291_probe(struct i2c_client *client, { struct ad7291_chip_info *chip; struct iio_dev *indio_dev; - int ret = 0; + int ret = 0, voltage_uv = 0; indio_dev = iio_allocate_device(sizeof(*chip)); if (indio_dev == NULL) { @@ -532,6 +546,15 @@ static int __devinit ad7291_probe(struct i2c_client *client, goto error_ret; } chip = iio_priv(indio_dev); + + chip->reg = regulator_get(&client->dev, "vcc"); + if (!IS_ERR(chip->reg)) { + ret = regulator_enable(chip->reg); + if (ret) + goto error_put_reg; + voltage_uv = regulator_get_voltage(chip->reg); + } + mutex_init(&chip->state_lock); /* this is only used for device removal purposes */ i2c_set_clientdata(client, indio_dev); @@ -540,6 +563,13 @@ static int __devinit ad7291_probe(struct i2c_client *client, /* Tsense always enabled */ chip->command = AD7291_NOISE_DELAY | AD7291_T_SENSE_MASK; + if (voltage_uv) { + chip->int_vref_mv = voltage_uv / 1000; + chip->command |= AD7291_EXT_REF; + } else { + chip->int_vref_mv = 2500; /* Build-in ref */ + } + indio_dev->name = id->name; indio_dev->channels = ad7291_channels; indio_dev->num_channels = ARRAY_SIZE(ad7291_channels); @@ -556,7 +586,7 @@ static int __devinit ad7291_probe(struct i2c_client *client, id->name, indio_dev); if (ret) - goto error_free_dev; + goto error_disable_reg; /* set irq polarity low level */ chip->command |= AD7291_ALERT_POLARITY; @@ -572,7 +602,7 @@ static int __devinit ad7291_probe(struct i2c_client *client, if (ret) goto error_unreg_irq; - dev_info(&client->dev, "%s temperature sensor registered.\n", + dev_info(&client->dev, "%s ADC registered.\n", id->name); return 0; @@ -580,7 +610,13 @@ static int __devinit ad7291_probe(struct i2c_client *client, error_unreg_irq: if (client->irq) free_irq(client->irq, indio_dev); -error_free_dev: +error_disable_reg: + if (!IS_ERR(chip->reg)) + regulator_disable(chip->reg); +error_put_reg: + if (!IS_ERR(chip->reg)) + regulator_put(chip->reg); + iio_free_device(indio_dev); error_ret: return ret; @@ -589,9 +625,16 @@ error_ret: static int __devexit ad7291_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ad7291_chip_info *chip = iio_priv(indio_dev); if (client->irq) free_irq(client->irq, indio_dev); + + if (!IS_ERR(chip->reg)) { + regulator_disable(chip->reg); + regulator_put(chip->reg); + } + iio_device_unregister(indio_dev); return 0; -- 2.7.4