From e5664293992e7483cf70b82390cd0ce45fa53218 Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 2 Sep 2011 17:25:26 +0100 Subject: [PATCH] staging:iio:adc:ad7152: increase readability by introducing proper bit defines Some other miscellaneous cleanup. Signed-off-by: Michael Hennerich Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/ad7152.c | 133 +++++++++++++++++++------------ 1 file changed, 83 insertions(+), 50 deletions(-) diff --git a/drivers/staging/iio/adc/ad7152.c b/drivers/staging/iio/adc/ad7152.c index 4ac5d7f26d69..a43cf63a9edc 100644 --- a/drivers/staging/iio/adc/ad7152.c +++ b/drivers/staging/iio/adc/ad7152.c @@ -1,7 +1,7 @@ /* * AD7152 capacitive sensor driver supporting AD7152/3 * - * Copyright 2010 Analog Devices Inc. + * Copyright 2010-2011a Analog Devices Inc. * * Licensed under the GPL-2 or later. */ @@ -25,24 +25,55 @@ * AD7152 registers definition */ -#define AD7152_STATUS 0 -#define AD7152_STATUS_RDY1 (1 << 0) -#define AD7152_STATUS_RDY2 (1 << 1) -#define AD7152_CH1_DATA_HIGH 1 -#define AD7152_CH2_DATA_HIGH 3 -#define AD7152_CH1_OFFS_HIGH 5 -#define AD7152_CH2_OFFS_HIGH 7 -#define AD7152_CH1_GAIN_HIGH 9 -#define AD7152_CH1_SETUP 11 -#define AD7152_CH2_GAIN_HIGH 12 -#define AD7152_CH2_SETUP 14 -#define AD7152_CFG 15 -#define AD7152_RESEVERD 16 -#define AD7152_CAPDAC_POS 17 -#define AD7152_CAPDAC_NEG 18 -#define AD7152_CFG2 26 - -#define AD7152_MAX_CONV_MODE 6 +#define AD7152_REG_STATUS 0 +#define AD7152_REG_CH1_DATA_HIGH 1 +#define AD7152_REG_CH2_DATA_HIGH 3 +#define AD7152_REG_CH1_OFFS_HIGH 5 +#define AD7152_REG_CH2_OFFS_HIGH 7 +#define AD7152_REG_CH1_GAIN_HIGH 9 +#define AD7152_REG_CH1_SETUP 11 +#define AD7152_REG_CH2_GAIN_HIGH 12 +#define AD7152_REG_CH2_SETUP 14 +#define AD7152_REG_CFG 15 +#define AD7152_REG_RESEVERD 16 +#define AD7152_REG_CAPDAC_POS 17 +#define AD7152_REG_CAPDAC_NEG 18 +#define AD7152_REG_CFG2 26 + +/* Status Register Bit Designations (AD7152_REG_STATUS) */ +#define AD7152_STATUS_RDY1 (1 << 0) +#define AD7152_STATUS_RDY2 (1 << 1) +#define AD7152_STATUS_C1C2 (1 << 2) +#define AD7152_STATUS_PWDN (1 << 7) + +/* Setup Register Bit Designations (AD7152_REG_CHx_SETUP) */ +#define AD7152_SETUP_CAPDIFF (1 << 5) +#define AD7152_SETUP_RANGE_2pF (0 << 6) +#define AD7152_SETUP_RANGE_0_5pF (1 << 6) +#define AD7152_SETUP_RANGE_1pF (2 << 6) +#define AD7152_SETUP_RANGE_4pF (3 << 6) + +/* Config Register Bit Designations (AD7152_REG_CFG) */ +#define AD7152_CONF_CH2EN (1 << 3) +#define AD7152_CONF_CH1EN (1 << 4) +#define AD7152_CONF_MODE_IDLE (0 << 0) +#define AD7152_CONF_MODE_CONT_CONV (1 << 0) +#define AD7152_CONF_MODE_SINGLE_CONV (2 << 0) +#define AD7152_CONF_MODE_OFFS_CAL (5 << 0) +#define AD7152_CONF_MODE_GAIN_CAL (6 << 0) + +/* Capdac Register Bit Designations (AD7152_REG_CAPDAC_XXX) */ +#define AD7152_CAPDAC_DACEN (1 << 7) +#define AD7152_CAPDAC_DACP(x) ((x) & 0x1F) + +#define AD7152_MAX_CONV_MODE 6 + +enum { + AD7152_DATA, + AD7152_OFFS, + AD7152_GAIN, + AD7152_SETUP +}; /* * struct ad7152_chip_info - chip specifc information @@ -77,11 +108,11 @@ static inline ssize_t ad7152_start_calib(struct device *dev, return 0; if (this_attr->address == 0) - regval |= (1 << 4); + regval |= AD7152_CONF_CH1EN; else - regval |= (1 << 3); + regval |= AD7152_CONF_CH2EN; - ret = i2c_smbus_write_byte_data(chip->client, AD7152_CFG, regval); + ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG, regval); if (ret < 0) return ret; /* Unclear on period this should be set for or whether it flips back @@ -94,14 +125,16 @@ static ssize_t ad7152_start_offset_calib(struct device *dev, size_t len) { - return ad7152_start_calib(dev, attr, buf, len, 5); + return ad7152_start_calib(dev, attr, buf, len, + AD7152_CONF_MODE_OFFS_CAL); } static ssize_t ad7152_start_gain_calib(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - return ad7152_start_calib(dev, attr, buf, len, 6); + return ad7152_start_calib(dev, attr, buf, len, + AD7152_CONF_MODE_GAIN_CAL); } static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration, @@ -140,7 +173,7 @@ static ssize_t ad7152_store_filter_rate_setup(struct device *dev, if (ret < 0) return ret; - ret = i2c_smbus_write_byte_data(chip->client, AD7152_CFG2, data); + ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG2, data); if (ret < 0) return ret; @@ -167,10 +200,10 @@ static const struct attribute_group ad7152_attribute_group = { }; static const u8 ad7152_addresses[][4] = { - { AD7152_CH1_DATA_HIGH, AD7152_CH1_OFFS_HIGH, - AD7152_CH1_GAIN_HIGH, AD7152_CH1_SETUP }, - { AD7152_CH2_DATA_HIGH, AD7152_CH2_OFFS_HIGH, - AD7152_CH2_GAIN_HIGH, AD7152_CH2_SETUP }, + { AD7152_REG_CH1_DATA_HIGH, AD7152_REG_CH1_OFFS_HIGH, + AD7152_REG_CH1_GAIN_HIGH, AD7152_REG_CH1_SETUP }, + { AD7152_REG_CH2_DATA_HIGH, AD7152_REG_CH2_OFFS_HIGH, + AD7152_REG_CH2_GAIN_HIGH, AD7152_REG_CH2_SETUP }, }; /* Values are micro relative to pf base. */ @@ -192,8 +225,8 @@ static int ad7152_write_raw(struct iio_dev *dev_info, if ((val < 0) | (val > 0xFFFF)) return -EINVAL; ret = i2c_smbus_write_word_data(chip->client, - ad7152_addresses[chan->channel][2], - val); + ad7152_addresses[chan->channel][AD7152_GAIN], + val); if (ret < 0) return ret; @@ -203,8 +236,8 @@ static int ad7152_write_raw(struct iio_dev *dev_info, if ((val < 0) | (val > 0xFFFF)) return -EINVAL; ret = i2c_smbus_write_word_data(chip->client, - ad7152_addresses[chan->channel][1], - val); + ad7152_addresses[chan->channel][AD7152_OFFS], + val); if (ret < 0) return ret; @@ -216,13 +249,13 @@ static int ad7152_write_raw(struct iio_dev *dev_info, if (val2 <= ad7152_scale_table[i]) break; ret = i2c_smbus_read_byte_data(chip->client, - ad7152_addresses[chan->channel][3]); + ad7152_addresses[chan->channel][AD7152_SETUP]); if (ret < 0) return ret; if ((ret & 0xC0) != i) ret = i2c_smbus_write_byte_data(chip->client, - ad7152_addresses[chan->channel][3], - (ret & ~0xC0) | i); + ad7152_addresses[chan->channel][AD7152_SETUP], + (ret & ~0xC0) | i); if (ret < 0) return ret; else @@ -243,25 +276,25 @@ static int ad7152_read_raw(struct iio_dev *dev_info, case 0: /* First set whether in differential mode */ if (chan->differential) - regval = (1 << 5); + regval = AD7152_SETUP_CAPDIFF; /* Make sure the channel is enabled */ - if (chan->channel == 0) - regval |= (1 << 4); + if (chan->address == 0) + regval |= AD7152_CONF_CH1EN; else - regval |= (1 << 3); + regval |= AD7152_CONF_CH2EN; /* Trigger a single read */ - regval |= 0x02; + regval |= AD7152_CONF_MODE_SINGLE_CONV; ret = i2c_smbus_write_byte_data(chip->client, - ad7152_addresses[chan->channel][3], - regval); + ad7152_addresses[chan->channel][AD7152_SETUP], + regval); if (ret < 0) return ret; msleep(60); /* Slowest conversion time */ /* Now read the actual register */ ret = i2c_smbus_read_word_data(chip->client, - ad7152_addresses[chan->channel][0]); + ad7152_addresses[chan->channel][AD7152_DATA]); if (ret < 0) return ret; *val = ret; @@ -270,7 +303,7 @@ static int ad7152_read_raw(struct iio_dev *dev_info, case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE): /* FIXME: Hmm. very small. it's 1+ 1/(2^16 *val) */ ret = i2c_smbus_read_word_data(chip->client, - ad7152_addresses[chan->channel][2]); + ad7152_addresses[chan->channel][AD7152_GAIN]); if (ret < 0) return ret; *val = ret; @@ -278,7 +311,7 @@ static int ad7152_read_raw(struct iio_dev *dev_info, return IIO_VAL_INT; case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE): ret = i2c_smbus_read_word_data(chip->client, - ad7152_addresses[chan->channel][1]); + ad7152_addresses[chan->channel][AD7152_OFFS]); if (ret < 0) return ret; *val = ret; @@ -286,7 +319,7 @@ static int ad7152_read_raw(struct iio_dev *dev_info, return IIO_VAL_INT; case (1 << IIO_CHAN_INFO_SCALE_SEPARATE): ret = i2c_smbus_read_byte_data(chip->client, - ad7152_addresses[chan->channel][3]); + ad7152_addresses[chan->channel][AD7152_SETUP]); if (ret < 0) return ret; *val = 0; @@ -361,7 +394,7 @@ static int __devinit ad7152_probe(struct i2c_client *client, chip->client = client; - /* Echipabilish that the iio_dev is a child of the i2c device */ + /* Establish that the iio_dev is a child of the i2c device */ indio_dev->name = id->name; indio_dev->dev.parent = &client->dev; indio_dev->info = &ad7152_info; @@ -406,7 +439,7 @@ MODULE_DEVICE_TABLE(i2c, ad7152_id); static struct i2c_driver ad7152_driver = { .driver = { - .name = "ad7152", + .name = KBUILD_MODNAME, }, .probe = ad7152_probe, .remove = __devexit_p(ad7152_remove), @@ -424,7 +457,7 @@ static __exit void ad7152_exit(void) } MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); -MODULE_DESCRIPTION("Analog Devices ad7152/3 capacitive sensor driver"); +MODULE_DESCRIPTION("Analog Devices AD7152/3 capacitive sensor driver"); MODULE_LICENSE("GPL v2"); module_init(ad7152_init); -- 2.20.1