diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5791.c')
-rw-r--r-- | drivers/staging/iio/dac/ad5791.c | 262 |
1 files changed, 124 insertions, 138 deletions
diff --git a/drivers/staging/iio/dac/ad5791.c b/drivers/staging/iio/dac/ad5791.c index 64770d2a1b4c..6fbca8d96153 100644 --- a/drivers/staging/iio/dac/ad5791.c +++ b/drivers/staging/iio/dac/ad5791.c @@ -7,7 +7,6 @@ */ #include <linux/interrupt.h> -#include <linux/gpio.h> #include <linux/fs.h> #include <linux/device.h> #include <linux/kernel.h> @@ -15,6 +14,7 @@ #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/regulator/consumer.h> +#include <linux/module.h> #include "../iio.h" #include "../sysfs.h" @@ -71,48 +71,23 @@ static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val) return ret; } -static ssize_t ad5791_write_dac(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - long readin; - int ret; - - ret = strict_strtol(buf, 10, &readin); - if (ret) - return ret; - - readin += (1 << (st->chip_info->bits - 1)); - readin &= AD5791_RES_MASK(st->chip_info->bits); - readin <<= st->chip_info->left_shift; - - ret = ad5791_spi_write(st->spi, this_attr->address, readin); - return ret ? ret : len; +#define AD5791_CHAN(bits, shift) { \ + .type = IIO_VOLTAGE, \ + .output = 1, \ + .indexed = 1, \ + .address = AD5791_ADDR_DAC0, \ + .channel = 0, \ + .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED) | \ + (1 << IIO_CHAN_INFO_OFFSET_SHARED), \ + .scan_type = IIO_ST('u', bits, 24, shift) \ } -static ssize_t ad5791_read_dac(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - int ret; - int val; - - ret = ad5791_spi_read(st->spi, this_attr->address, &val); - if (ret) - return ret; - - val &= AD5791_DAC_MASK; - val >>= st->chip_info->left_shift; - val -= (1 << (st->chip_info->bits - 1)); - - return sprintf(buf, "%d\n", val); -} +static const struct iio_chan_spec ad5791_channels[] = { + [ID_AD5760] = AD5791_CHAN(16, 4), + [ID_AD5780] = AD5791_CHAN(18, 2), + [ID_AD5781] = AD5791_CHAN(18, 2), + [ID_AD5791] = AD5791_CHAN(20, 0) +}; static ssize_t ad5791_read_powerdown_mode(struct device *dev, struct device_attribute *attr, char *buf) @@ -183,58 +158,24 @@ static ssize_t ad5791_write_dac_powerdown(struct device *dev, return ret ? ret : len; } -static ssize_t ad5791_show_scale(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - /* Corresponds to Vref / 2^(bits) */ - unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits; - - return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); -} -static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5791_show_scale, NULL, 0); - -static ssize_t ad5791_show_name(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); -} -static IIO_DEVICE_ATTR(name, S_IRUGO, ad5791_show_name, NULL, 0); - -#define IIO_DEV_ATTR_OUT_RW_RAW(_num, _show, _store, _addr) \ - IIO_DEVICE_ATTR(out##_num##_raw, \ - S_IRUGO | S_IWUSR, _show, _store, _addr) - -static IIO_DEV_ATTR_OUT_RW_RAW(0, ad5791_read_dac, - ad5791_write_dac, AD5791_ADDR_DAC0); - -static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO | +static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO | S_IWUSR, ad5791_read_powerdown_mode, ad5791_write_powerdown_mode, 0); -static IIO_CONST_ATTR(out_powerdown_mode_available, +static IIO_CONST_ATTR(out_voltage_powerdown_mode_available, "6kohm_to_gnd three_state"); #define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \ - IIO_DEVICE_ATTR(out##_num##_powerdown, \ + IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \ S_IRUGO | S_IWUSR, _show, _store, _addr) static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown, ad5791_write_dac_powerdown, 0); static struct attribute *ad5791_attributes[] = { - &iio_dev_attr_out0_raw.dev_attr.attr, - &iio_dev_attr_out0_powerdown.dev_attr.attr, - &iio_dev_attr_out_powerdown_mode.dev_attr.attr, - &iio_const_attr_out_powerdown_mode_available.dev_attr.attr, - &iio_dev_attr_out_scale.dev_attr.attr, - &iio_dev_attr_name.dev_attr.attr, + &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr, + &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr, + &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr, NULL, }; @@ -263,31 +204,78 @@ static int ad5780_get_lin_comp(unsigned int span) else return AD5780_LINCOMP_10_20; } - static const struct ad5791_chip_info ad5791_chip_info_tbl[] = { [ID_AD5760] = { - .bits = 16, - .left_shift = 4, .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5780] = { - .bits = 18, - .left_shift = 2, .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5781] = { - .bits = 18, - .left_shift = 2, .get_lin_comp = ad5791_get_lin_comp, }, [ID_AD5791] = { - .bits = 20, - .left_shift = 0, .get_lin_comp = ad5791_get_lin_comp, }, }; +static int ad5791_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad5791_state *st = iio_priv(indio_dev); + u64 val64; + int ret; + + switch (m) { + case 0: + ret = ad5791_spi_read(st->spi, chan->address, val); + if (ret) + return ret; + *val &= AD5791_DAC_MASK; + *val >>= chan->scan_type.shift; + return IIO_VAL_INT; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + *val = 0; + *val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits; + return IIO_VAL_INT_PLUS_MICRO; + case (1 << IIO_CHAN_INFO_OFFSET_SHARED): + val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits); + do_div(val64, st->vref_mv); + *val = -val64; + return IIO_VAL_INT; + default: + return -EINVAL; + } + +}; + + +static int ad5791_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad5791_state *st = iio_priv(indio_dev); + + switch (mask) { + case 0: + val &= AD5791_RES_MASK(chan->scan_type.realbits); + val <<= chan->scan_type.shift; + + return ad5791_spi_write(st->spi, chan->address, val); + + default: + return -EINVAL; + } +} + static const struct iio_info ad5791_info = { + .read_raw = &ad5791_read_raw, + .write_raw = &ad5791_write_raw, .attrs = &ad5791_attribute_group, .driver_module = THIS_MODULE, }; @@ -296,50 +284,52 @@ static int __devinit ad5791_probe(struct spi_device *spi) { struct ad5791_platform_data *pdata = spi->dev.platform_data; struct iio_dev *indio_dev; - struct regulator *reg_vdd, *reg_vss; struct ad5791_state *st; int ret, pos_voltage_uv = 0, neg_voltage_uv = 0; - reg_vdd = regulator_get(&spi->dev, "vdd"); - if (!IS_ERR(reg_vdd)) { - ret = regulator_enable(reg_vdd); + indio_dev = iio_allocate_device(sizeof(*st)); + if (indio_dev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + st = iio_priv(indio_dev); + st->reg_vdd = regulator_get(&spi->dev, "vdd"); + if (!IS_ERR(st->reg_vdd)) { + ret = regulator_enable(st->reg_vdd); if (ret) goto error_put_reg_pos; - pos_voltage_uv = regulator_get_voltage(reg_vdd); + pos_voltage_uv = regulator_get_voltage(st->reg_vdd); } - reg_vss = regulator_get(&spi->dev, "vss"); - if (!IS_ERR(reg_vss)) { - ret = regulator_enable(reg_vss); + st->reg_vss = regulator_get(&spi->dev, "vss"); + if (!IS_ERR(st->reg_vss)) { + ret = regulator_enable(st->reg_vss); if (ret) goto error_put_reg_neg; - neg_voltage_uv = regulator_get_voltage(reg_vss); + neg_voltage_uv = regulator_get_voltage(st->reg_vss); } - indio_dev = iio_allocate_device(sizeof(*st)); - if (indio_dev == NULL) { - ret = -ENOMEM; - goto error_disable_reg_neg; - } - st = iio_priv(indio_dev); st->pwr_down = true; st->spi = spi; - if (!IS_ERR(reg_vss) && !IS_ERR(reg_vdd)) - st->vref_mv = (pos_voltage_uv - neg_voltage_uv) / 1000; - else if (pdata) - st->vref_mv = pdata->vref_pos_mv - pdata->vref_neg_mv; - else + if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) { + st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000; + st->vref_neg_mv = neg_voltage_uv / 1000; + } else if (pdata) { + st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv; + st->vref_neg_mv = pdata->vref_neg_mv; + } else { dev_warn(&spi->dev, "reference voltage unspecified\n"); + } ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET); if (ret) - goto error_free_dev; + goto error_disable_reg_neg; - st->chip_info = - &ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi) + ->driver_data]; st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv)) @@ -349,39 +339,37 @@ static int __devinit ad5791_probe(struct spi_device *spi) ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl | AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); if (ret) - goto error_free_dev; - - st->reg_vdd = reg_vdd; - st->reg_vss = reg_vss; + goto error_disable_reg_neg; spi_set_drvdata(spi, indio_dev); indio_dev->dev.parent = &spi->dev; indio_dev->info = &ad5791_info; indio_dev->modes = INDIO_DIRECT_MODE; - + indio_dev->channels + = &ad5791_channels[spi_get_device_id(spi)->driver_data]; + indio_dev->num_channels = 1; + indio_dev->name = spi_get_device_id(st->spi)->name; ret = iio_device_register(indio_dev); if (ret) - goto error_free_dev; + goto error_disable_reg_neg; return 0; -error_free_dev: - iio_free_device(indio_dev); - error_disable_reg_neg: - if (!IS_ERR(reg_vss)) - regulator_disable(reg_vss); + if (!IS_ERR(st->reg_vss)) + regulator_disable(st->reg_vss); error_put_reg_neg: - if (!IS_ERR(reg_vss)) - regulator_put(reg_vss); + if (!IS_ERR(st->reg_vss)) + regulator_put(st->reg_vss); - if (!IS_ERR(reg_vdd)) - regulator_disable(reg_vdd); + if (!IS_ERR(st->reg_vdd)) + regulator_disable(st->reg_vdd); error_put_reg_pos: - if (!IS_ERR(reg_vdd)) - regulator_put(reg_vdd); - + if (!IS_ERR(st->reg_vdd)) + regulator_put(st->reg_vdd); + iio_free_device(indio_dev); error_ret: + return ret; } @@ -389,20 +377,18 @@ static int __devexit ad5791_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); struct ad5791_state *st = iio_priv(indio_dev); - struct regulator *reg_vdd = st->reg_vdd; - struct regulator *reg_vss = st->reg_vss; iio_device_unregister(indio_dev); - if (!IS_ERR(st->reg_vdd)) { - regulator_disable(reg_vdd); - regulator_put(reg_vdd); + regulator_disable(st->reg_vdd); + regulator_put(st->reg_vdd); } if (!IS_ERR(st->reg_vss)) { - regulator_disable(reg_vss); - regulator_put(reg_vss); + regulator_disable(st->reg_vss); + regulator_put(st->reg_vss); } + iio_free_device(indio_dev); return 0; } |