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staging:iio:dac:ad5791: allocate chip state with iio_dev and use iio_priv for access.

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Slightly fiddly case with two regulators - could reorder, but this is the approach with
smallest likely impact.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron 2011-06-27 13:07:34 +01:00 committed by Greg Kroah-Hartman
parent 86729fc46f
commit f5730d52ba
2 changed files with 55 additions and 59 deletions
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112
drivers/staging/iio/dac/ad5791.c
View File

@ -76,7 +76,7 @@ static ssize_t ad5791_write_dac(struct device *dev,
const char *buf, size_t len) const char *buf, size_t len)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
long readin; long readin;
int ret; int ret;
@ -98,7 +98,7 @@ static ssize_t ad5791_read_dac(struct device *dev,
char *buf) char *buf)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret; int ret;
int val; int val;
@ -118,7 +118,7 @@ static ssize_t ad5791_read_powerdown_mode(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
const char mode[][14] = {"6kohm_to_gnd", "three_state"}; const char mode[][14] = {"6kohm_to_gnd", "three_state"};
@ -130,7 +130,7 @@ static ssize_t ad5791_write_powerdown_mode(struct device *dev,
const char *buf, size_t len) const char *buf, size_t len)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
int ret; int ret;
if (sysfs_streq(buf, "6kohm_to_gnd")) if (sysfs_streq(buf, "6kohm_to_gnd"))
@ -148,7 +148,7 @@ static ssize_t ad5791_read_dac_powerdown(struct device *dev,
char *buf) char *buf)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->pwr_down); return sprintf(buf, "%d\n", st->pwr_down);
} }
@ -160,7 +160,7 @@ static ssize_t ad5791_write_dac_powerdown(struct device *dev,
long readin; long readin;
int ret; int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
ret = strict_strtol(buf, 10, &readin); ret = strict_strtol(buf, 10, &readin);
if (ret) if (ret)
@ -188,7 +188,7 @@ static ssize_t ad5791_show_scale(struct device *dev,
char *buf) char *buf)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
/* Corresponds to Vref / 2^(bits) */ /* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits; unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
@ -201,7 +201,7 @@ static ssize_t ad5791_show_name(struct device *dev,
char *buf) char *buf)
{ {
struct iio_dev *indio_dev = dev_get_drvdata(dev); struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_dev_get_devdata(indio_dev); struct ad5791_state *st = iio_priv(indio_dev);
return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
} }
@ -295,36 +295,39 @@ static const struct iio_info ad5791_info = {
static int __devinit ad5791_probe(struct spi_device *spi) static int __devinit ad5791_probe(struct spi_device *spi)
{ {
struct ad5791_platform_data *pdata = spi->dev.platform_data; struct ad5791_platform_data *pdata = spi->dev.platform_data;
struct iio_dev *indio_dev;
struct regulator *reg_vdd, *reg_vss;
struct ad5791_state *st; struct ad5791_state *st;
int ret, pos_voltage_uv = 0, neg_voltage_uv = 0; int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
st = kzalloc(sizeof(*st), GFP_KERNEL); reg_vdd = regulator_get(&spi->dev, "vdd");
if (st == NULL) { if (!IS_ERR(reg_vdd)) {
ret = -ENOMEM; ret = regulator_enable(reg_vdd);
goto error_ret;
}
spi_set_drvdata(spi, st);
st->reg_vdd = regulator_get(&spi->dev, "vdd");
if (!IS_ERR(st->reg_vdd)) {
ret = regulator_enable(st->reg_vdd);
if (ret) if (ret)
goto error_put_reg_pos; goto error_put_reg_pos;
pos_voltage_uv = regulator_get_voltage(st->reg_vdd); pos_voltage_uv = regulator_get_voltage(reg_vdd);
} }
st->reg_vss = regulator_get(&spi->dev, "vss"); reg_vss = regulator_get(&spi->dev, "vss");
if (!IS_ERR(st->reg_vss)) { if (!IS_ERR(reg_vss)) {
ret = regulator_enable(st->reg_vss); ret = regulator_enable(reg_vss);
if (ret) if (ret)
goto error_put_reg_neg; goto error_put_reg_neg;
neg_voltage_uv = regulator_get_voltage(st->reg_vss); neg_voltage_uv = regulator_get_voltage(reg_vss);
} }
if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) 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; st->vref_mv = (pos_voltage_uv - neg_voltage_uv) / 1000;
else if (pdata) else if (pdata)
st->vref_mv = pdata->vref_pos_mv - pdata->vref_neg_mv; st->vref_mv = pdata->vref_pos_mv - pdata->vref_neg_mv;
@ -333,7 +336,7 @@ static int __devinit ad5791_probe(struct spi_device *spi)
ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET); ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
if (ret) if (ret)
goto error_disable_reg_neg; goto error_free_dev;
st->chip_info = st->chip_info =
&ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data]; &ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data];
@ -346,66 +349,61 @@ static int __devinit ad5791_probe(struct spi_device *spi)
ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl | ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
if (ret) if (ret)
goto error_disable_reg_neg; goto error_free_dev;
st->pwr_down = true; st->reg_vdd = reg_vdd;
st->reg_vss = reg_vss;
st->spi = spi; spi_set_drvdata(spi, indio_dev);
st->indio_dev = iio_allocate_device(0); indio_dev->dev.parent = &spi->dev;
if (st->indio_dev == NULL) { indio_dev->info = &ad5791_info;
ret = -ENOMEM; indio_dev->modes = INDIO_DIRECT_MODE;
goto error_disable_reg_neg;
}
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->info = &ad5791_info;
st->indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(st->indio_dev); ret = iio_device_register(indio_dev);
if (ret) if (ret)
goto error_free_dev; goto error_free_dev;
return 0; return 0;
error_free_dev: error_free_dev:
iio_free_device(st->indio_dev); iio_free_device(indio_dev);
error_disable_reg_neg: error_disable_reg_neg:
if (!IS_ERR(st->reg_vss)) if (!IS_ERR(reg_vss))
regulator_disable(st->reg_vss); regulator_disable(reg_vss);
error_put_reg_neg: error_put_reg_neg:
if (!IS_ERR(st->reg_vss)) if (!IS_ERR(reg_vss))
regulator_put(st->reg_vss); regulator_put(reg_vss);
if (!IS_ERR(st->reg_vdd)) if (!IS_ERR(reg_vdd))
regulator_disable(st->reg_vdd); regulator_disable(reg_vdd);
error_put_reg_pos: error_put_reg_pos:
if (!IS_ERR(st->reg_vdd)) if (!IS_ERR(reg_vdd))
regulator_put(st->reg_vdd); regulator_put(reg_vdd);
kfree(st);
error_ret: error_ret:
return ret; return ret;
} }
static int __devexit ad5791_remove(struct spi_device *spi) static int __devexit ad5791_remove(struct spi_device *spi)
{ {
struct ad5791_state *st = spi_get_drvdata(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(st->indio_dev); iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg_vdd)) { if (!IS_ERR(st->reg_vdd)) {
regulator_disable(st->reg_vdd); regulator_disable(reg_vdd);
regulator_put(st->reg_vdd); regulator_put(reg_vdd);
} }
if (!IS_ERR(st->reg_vss)) { if (!IS_ERR(st->reg_vss)) {
regulator_disable(st->reg_vss); regulator_disable(reg_vss);
regulator_put(st->reg_vss); regulator_put(reg_vss);
} }
kfree(st);
return 0; return 0;
} }

2
drivers/staging/iio/dac/ad5791.h
View File

@ -81,7 +81,6 @@ struct ad5791_chip_info {
/** /**
* struct ad5791_state - driver instance specific data * struct ad5791_state - driver instance specific data
* @indio_dev: the industrial I/O device
* @us: spi_device * @us: spi_device
* @reg_vdd: positive supply regulator * @reg_vdd: positive supply regulator
* @reg_vss: negative supply regulator * @reg_vss: negative supply regulator
@ -91,7 +90,6 @@ struct ad5791_chip_info {
*/ */
struct ad5791_state { struct ad5791_state {
struct iio_dev *indio_dev;
struct spi_device *spi; struct spi_device *spi;
struct regulator *reg_vdd; struct regulator *reg_vdd;
struct regulator *reg_vss; struct regulator *reg_vss;