summaryrefslogtreecommitdiff
path: root/drivers/iio/adc
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r--drivers/iio/adc/Kconfig52
-rw-r--r--drivers/iio/adc/berlin2-adc.c22
-rw-r--r--drivers/iio/adc/cc10001_adc.c26
-rw-r--r--drivers/iio/adc/mcp320x.c16
-rw-r--r--drivers/iio/adc/mcp3422.c1
-rw-r--r--drivers/iio/adc/ti-adc081c.c1
-rw-r--r--drivers/iio/adc/twl4030-madc.c34
-rw-r--r--drivers/iio/adc/vf610_adc.c79
8 files changed, 195 insertions, 36 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index eb0cd8977..50c103d75 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -20,6 +20,9 @@ config AD7266
Say yes here to build support for Analog Devices AD7265 and AD7266
ADCs.
+ To compile this driver as a module, choose M here: the module will be
+ called ad7266.
+
config AD7291
tristate "Analog Devices AD7291 ADC driver"
depends on I2C
@@ -52,8 +55,6 @@ config AD7476
AD7277, AD7278, AD7475, AD7476, AD7477, AD7478, AD7466, AD7467, AD7468,
AD7495, AD7910, AD7920, AD7920 SPI analog to digital converters (ADC).
- If unsure, say N (but it's safe to say "Y").
-
To compile this driver as a module, choose M here: the
module will be called ad7476.
@@ -63,8 +64,7 @@ config AD7791
select AD_SIGMA_DELTA
help
Say yes here to build support for Analog Devices AD7787, AD7788, AD7789,
- AD7790 and AD7791 SPI analog to digital converters (ADC). If unsure, say
- N (but it is safe to say "Y").
+ AD7790 and AD7791 SPI analog to digital converters (ADC).
To compile this driver as a module, choose M here: the module will be
called ad7791.
@@ -76,7 +76,6 @@ config AD7793
help
Say yes here to build support for Analog Devices AD7785, AD7792, AD7793,
AD7794 and AD7795 SPI analog to digital converters (ADC).
- If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
module will be called AD7793.
@@ -89,7 +88,6 @@ config AD7887
help
Say yes here to build support for Analog Devices
AD7887 SPI analog to digital converter (ADC).
- If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
module will be called ad7887.
@@ -117,6 +115,9 @@ config AD799X
i2c analog to digital converters (ADC). Provides direct access
via sysfs.
+ To compile this driver as a module, choose M here: the module will be
+ called ad799x.
+
config AT91_ADC
tristate "Atmel AT91 ADC"
depends on ARCH_AT91
@@ -127,6 +128,9 @@ config AT91_ADC
help
Say yes here to build support for Atmel AT91 ADC.
+ To compile this driver as a module, choose M here: the module will be
+ called at91_adc.
+
config AXP288_ADC
tristate "X-Powers AXP288 ADC driver"
depends on MFD_AXP20X
@@ -135,6 +139,9 @@ config AXP288_ADC
device. Depending on platform configuration, this general purpose ADC can
be used for sampling sensors such as thermal resistors.
+ To compile this driver as a module, choose M here: the module will be
+ called axp288_adc.
+
config BERLIN2_ADC
tristate "Marvell Berlin2 ADC driver"
depends on ARCH_BERLIN
@@ -151,6 +158,9 @@ config DA9150_GPADC
This driver can also be built as a module. If chosen, the module name
will be da9150-gpadc.
+ To compile this driver as a module, choose M here: the module will be
+ called berlin2-adc.
+
config CC10001_ADC
tristate "Cosmic Circuits 10001 ADC driver"
depends on HAS_IOMEM && HAVE_CLK && REGULATOR
@@ -170,12 +180,18 @@ config EXYNOS_ADC
of SoCs for drivers such as the touchscreen and hwmon to use to share
this resource.
+ To compile this driver as a module, choose M here: the module will be
+ called exynos_adc.
+
config LP8788_ADC
tristate "LP8788 ADC driver"
depends on MFD_LP8788
help
Say yes here to build support for TI LP8788 ADC.
+ To compile this driver as a module, choose M here: the module will be
+ called lp8788_adc.
+
config MAX1027
tristate "Maxim max1027 ADC driver"
depends on SPI
@@ -185,6 +201,9 @@ config MAX1027
Say yes here to build support for Maxim SPI ADC models
max1027, max1029 and max1031.
+ To compile this driver as a module, choose M here: the module will be
+ called max1027.
+
config MAX1363
tristate "Maxim max1363 ADC driver"
depends on I2C
@@ -201,13 +220,16 @@ config MAX1363
max11646, max11647) Provides direct access via sysfs and buffered
data via the iio dev interface.
+ To compile this driver as a module, choose M here: the module will be
+ called max1363.
+
config MCP320X
tristate "Microchip Technology MCP3x01/02/04/08"
depends on SPI
help
Say yes here to build support for Microchip Technology's
- MCP3001, MCP3002, MCP3004, MCP3008, MCP3201, MCP3202, MCP3204 or
- MCP3208 analog to digital converter.
+ MCP3001, MCP3002, MCP3004, MCP3008, MCP3201, MCP3202, MCP3204,
+ MCP3208 or MCP3301 analog to digital converter.
This driver can also be built as a module. If so, the module will be
called mcp320x.
@@ -309,15 +331,18 @@ config TI_AM335X_ADC
Say yes here to build support for Texas Instruments ADC
driver which is also a MFD client.
+ To compile this driver as a module, choose M here: the module will be
+ called ti_am335x_adc.
+
config TWL4030_MADC
tristate "TWL4030 MADC (Monitoring A/D Converter)"
depends on TWL4030_CORE
help
- This driver provides support for Triton TWL4030-MADC. The
- driver supports both RT and SW conversion methods.
+ This driver provides support for Triton TWL4030-MADC. The
+ driver supports both RT and SW conversion methods.
- This driver can also be built as a module. If so, the module will be
- called twl4030-madc.
+ This driver can also be built as a module. If so, the module will be
+ called twl4030-madc.
config TWL6030_GPADC
tristate "TWL6030 GPADC (General Purpose A/D Converter) Support"
@@ -350,6 +375,9 @@ config VIPERBOARD_ADC
Say yes here to access the ADC part of the Nano River
Technologies Viperboard.
+ To compile this driver as a module, choose M here: the module will be
+ called viperboard_adc.
+
config XILINX_XADC
tristate "Xilinx XADC driver"
depends on ARCH_ZYNQ || MICROBLAZE || COMPILE_TEST
diff --git a/drivers/iio/adc/berlin2-adc.c b/drivers/iio/adc/berlin2-adc.c
index aecc9ad99..4946d9bf1 100644
--- a/drivers/iio/adc/berlin2-adc.c
+++ b/drivers/iio/adc/berlin2-adc.c
@@ -26,7 +26,7 @@
#define BERLIN2_SM_CTRL 0x14
#define BERLIN2_SM_CTRL_SM_SOC_INT BIT(1)
#define BERLIN2_SM_CTRL_SOC_SM_INT BIT(2)
-#define BERLIN2_SM_CTRL_ADC_SEL(x) (BIT(x) << 5) /* 0-15 */
+#define BERLIN2_SM_CTRL_ADC_SEL(x) ((x) << 5) /* 0-15 */
#define BERLIN2_SM_CTRL_ADC_SEL_MASK (0xf << 5)
#define BERLIN2_SM_CTRL_ADC_POWER BIT(9)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_DIV2 (0x0 << 10)
@@ -53,14 +53,14 @@
#define BERLIN2_SM_ADC_MASK 0x3ff
#define BERLIN2_SM_ADC_STATUS 0x1c
#define BERLIN2_SM_ADC_STATUS_DATA_RDY(x) BIT(x) /* 0-15 */
-#define BERLIN2_SM_ADC_STATUS_DATA_RDY_MASK 0xf
+#define BERLIN2_SM_ADC_STATUS_DATA_RDY_MASK GENMASK(15, 0)
#define BERLIN2_SM_ADC_STATUS_INT_EN(x) (BIT(x) << 16) /* 0-15 */
-#define BERLIN2_SM_ADC_STATUS_INT_EN_MASK (0xf << 16)
+#define BERLIN2_SM_ADC_STATUS_INT_EN_MASK GENMASK(31, 16)
#define BERLIN2_SM_TSEN_STATUS 0x24
#define BERLIN2_SM_TSEN_STATUS_DATA_RDY BIT(0)
#define BERLIN2_SM_TSEN_STATUS_INT_EN BIT(1)
#define BERLIN2_SM_TSEN_DATA 0x28
-#define BERLIN2_SM_TSEN_MASK 0xfff
+#define BERLIN2_SM_TSEN_MASK GENMASK(9, 0)
#define BERLIN2_SM_TSEN_CTRL 0x74
#define BERLIN2_SM_TSEN_CTRL_START BIT(8)
#define BERLIN2_SM_TSEN_CTRL_SETTLING_4 (0x0 << 21) /* 4 us */
@@ -86,7 +86,7 @@ struct berlin2_adc_priv {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
}
-static struct iio_chan_spec berlin2_adc_channels[] = {
+static const struct iio_chan_spec berlin2_adc_channels[] = {
BERLIN2_ADC_CHANNEL(0, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(1, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(2, IIO_VOLTAGE), /* external input */
@@ -103,7 +103,6 @@ static struct iio_chan_spec berlin2_adc_channels[] = {
BERLIN2_ADC_CHANNEL(7, IIO_VOLTAGE), /* reserved */
IIO_CHAN_SOFT_TIMESTAMP(8), /* timestamp */
};
-#define BERLIN2_N_CHANNELS ARRAY_SIZE(berlin2_adc_channels)
static int berlin2_adc_read(struct iio_dev *indio_dev, int channel)
{
@@ -221,7 +220,7 @@ static int berlin2_adc_read_raw(struct iio_dev *indio_dev,
return temp;
if (temp > 2047)
- temp = -(4096 - temp);
+ temp -= 4096;
/* Convert to milli Celsius */
*val = ((temp * 100000) / 264 - 270000);
@@ -286,8 +285,7 @@ static int berlin2_adc_probe(struct platform_device *pdev)
int irq, tsen_irq;
int ret;
- indio_dev = devm_iio_device_alloc(&pdev->dev,
- sizeof(struct berlin2_adc_priv));
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
if (!indio_dev)
return -ENOMEM;
@@ -301,11 +299,11 @@ static int berlin2_adc_probe(struct platform_device *pdev)
irq = platform_get_irq_byname(pdev, "adc");
if (irq < 0)
- return -ENODEV;
+ return irq;
tsen_irq = platform_get_irq_byname(pdev, "tsen");
if (tsen_irq < 0)
- return -ENODEV;
+ return tsen_irq;
ret = devm_request_irq(&pdev->dev, irq, berlin2_adc_irq, 0,
pdev->dev.driver->name, indio_dev);
@@ -325,8 +323,8 @@ static int berlin2_adc_probe(struct platform_device *pdev)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &berlin2_adc_info;
- indio_dev->num_channels = BERLIN2_N_CHANNELS;
indio_dev->channels = berlin2_adc_channels;
+ indio_dev->num_channels = ARRAY_SIZE(berlin2_adc_channels);
/* Power up the ADC */
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
diff --git a/drivers/iio/adc/cc10001_adc.c b/drivers/iio/adc/cc10001_adc.c
index 115f6e99a..8254f529b 100644
--- a/drivers/iio/adc/cc10001_adc.c
+++ b/drivers/iio/adc/cc10001_adc.c
@@ -62,6 +62,7 @@ struct cc10001_adc_device {
struct regulator *reg;
u16 *buf;
+ bool shared;
struct mutex lock;
unsigned int start_delay_ns;
unsigned int eoc_delay_ns;
@@ -153,7 +154,8 @@ static irqreturn_t cc10001_adc_trigger_h(int irq, void *p)
mutex_lock(&adc_dev->lock);
- cc10001_adc_power_up(adc_dev);
+ if (!adc_dev->shared)
+ cc10001_adc_power_up(adc_dev);
/* Calculate delay step for eoc and sampled data */
delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;
@@ -177,7 +179,8 @@ static irqreturn_t cc10001_adc_trigger_h(int irq, void *p)
}
done:
- cc10001_adc_power_down(adc_dev);
+ if (!adc_dev->shared)
+ cc10001_adc_power_down(adc_dev);
mutex_unlock(&adc_dev->lock);
@@ -196,7 +199,8 @@ static u16 cc10001_adc_read_raw_voltage(struct iio_dev *indio_dev,
unsigned int delay_ns;
u16 val;
- cc10001_adc_power_up(adc_dev);
+ if (!adc_dev->shared)
+ cc10001_adc_power_up(adc_dev);
/* Calculate delay step for eoc and sampled data */
delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;
@@ -205,7 +209,8 @@ static u16 cc10001_adc_read_raw_voltage(struct iio_dev *indio_dev,
val = cc10001_adc_poll_done(indio_dev, chan->channel, delay_ns);
- cc10001_adc_power_down(adc_dev);
+ if (!adc_dev->shared)
+ cc10001_adc_power_down(adc_dev);
return val;
}
@@ -322,8 +327,10 @@ static int cc10001_adc_probe(struct platform_device *pdev)
adc_dev = iio_priv(indio_dev);
channel_map = GENMASK(CC10001_ADC_NUM_CHANNELS - 1, 0);
- if (!of_property_read_u32(node, "adc-reserved-channels", &ret))
+ if (!of_property_read_u32(node, "adc-reserved-channels", &ret)) {
+ adc_dev->shared = true;
channel_map &= ~ret;
+ }
adc_dev->reg = devm_regulator_get(&pdev->dev, "vref");
if (IS_ERR(adc_dev->reg))
@@ -368,6 +375,14 @@ static int cc10001_adc_probe(struct platform_device *pdev)
adc_dev->eoc_delay_ns = NSEC_PER_SEC / adc_clk_rate;
adc_dev->start_delay_ns = adc_dev->eoc_delay_ns * CC10001_WAIT_CYCLES;
+ /*
+ * There is only one register to power-up/power-down the AUX ADC.
+ * If the ADC is shared among multiple CPUs, always power it up here.
+ * If the ADC is used only by the MIPS, power-up/power-down at runtime.
+ */
+ if (adc_dev->shared)
+ cc10001_adc_power_up(adc_dev);
+
/* Setup the ADC channels available on the device */
ret = cc10001_adc_channel_init(indio_dev, channel_map);
if (ret < 0)
@@ -402,6 +417,7 @@ static int cc10001_adc_remove(struct platform_device *pdev)
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct cc10001_adc_device *adc_dev = iio_priv(indio_dev);
+ cc10001_adc_power_down(adc_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
clk_disable_unprepare(adc_dev->adc_clk);
diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
index d819823f7..b19e4f9d1 100644
--- a/drivers/iio/adc/mcp320x.c
+++ b/drivers/iio/adc/mcp320x.c
@@ -25,6 +25,7 @@
* http://ww1.microchip.com/downloads/en/DeviceDoc/21290D.pdf mcp3201
* http://ww1.microchip.com/downloads/en/DeviceDoc/21034D.pdf mcp3202
* http://ww1.microchip.com/downloads/en/DeviceDoc/21298c.pdf mcp3204/08
+ * http://ww1.microchip.com/downloads/en/DeviceDoc/21700E.pdf mcp3301
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -47,6 +48,7 @@ enum {
mcp3202,
mcp3204,
mcp3208,
+ mcp3301,
};
struct mcp320x_chip_info {
@@ -76,6 +78,7 @@ static int mcp320x_channel_to_tx_data(int device_index,
switch (device_index) {
case mcp3001:
case mcp3201:
+ case mcp3301:
return 0;
case mcp3002:
case mcp3202:
@@ -102,7 +105,7 @@ static int mcp320x_adc_conversion(struct mcp320x *adc, u8 channel,
adc->tx_buf = mcp320x_channel_to_tx_data(device_index,
channel, differential);
- if (device_index != mcp3001 && device_index != mcp3201) {
+ if (device_index != mcp3001 && device_index != mcp3201 && device_index != mcp3301) {
ret = spi_sync(adc->spi, &adc->msg);
if (ret < 0)
return ret;
@@ -125,6 +128,8 @@ static int mcp320x_adc_conversion(struct mcp320x *adc, u8 channel,
case mcp3204:
case mcp3208:
return (adc->rx_buf[0] << 4 | adc->rx_buf[1] >> 4);
+ case mcp3301:
+ return sign_extend32((adc->rx_buf[0] & 0x1f) << 8 | adc->rx_buf[1], 12);
default:
return -EINVAL;
}
@@ -274,6 +279,11 @@ static const struct mcp320x_chip_info mcp320x_chip_infos[] = {
.num_channels = ARRAY_SIZE(mcp3208_channels),
.resolution = 12
},
+ [mcp3301] = {
+ .channels = mcp3201_channels,
+ .num_channels = ARRAY_SIZE(mcp3201_channels),
+ .resolution = 13
+ },
};
static int mcp320x_probe(struct spi_device *spi)
@@ -369,6 +379,9 @@ static const struct of_device_id mcp320x_dt_ids[] = {
.compatible = "mcp3208",
.data = &mcp320x_chip_infos[mcp3208],
}, {
+ .compatible = "mcp3301",
+ .data = &mcp320x_chip_infos[mcp3301],
+ }, {
}
};
MODULE_DEVICE_TABLE(of, mcp320x_dt_ids);
@@ -383,6 +396,7 @@ static const struct spi_device_id mcp320x_id[] = {
{ "mcp3202", mcp3202 },
{ "mcp3204", mcp3204 },
{ "mcp3208", mcp3208 },
+ { "mcp3301", mcp3301 },
{ }
};
MODULE_DEVICE_TABLE(spi, mcp320x_id);
diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index b96c63647..355512200 100644
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -404,7 +404,6 @@ MODULE_DEVICE_TABLE(of, mcp3422_of_match);
static struct i2c_driver mcp3422_driver = {
.driver = {
.name = "mcp3422",
- .owner = THIS_MODULE,
.of_match_table = of_match_ptr(mcp3422_of_match),
},
.probe = mcp3422_probe,
diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c
index b3a82b4d1..2c8374f86 100644
--- a/drivers/iio/adc/ti-adc081c.c
+++ b/drivers/iio/adc/ti-adc081c.c
@@ -140,7 +140,6 @@ MODULE_DEVICE_TABLE(of, adc081c_of_match);
static struct i2c_driver adc081c_driver = {
.driver = {
.name = "adc081c",
- .owner = THIS_MODULE,
.of_match_table = of_match_ptr(adc081c_of_match),
},
.probe = adc081c_probe,
diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
index ebe415f10..0c74869a5 100644
--- a/drivers/iio/adc/twl4030-madc.c
+++ b/drivers/iio/adc/twl4030-madc.c
@@ -45,13 +45,18 @@
#include <linux/types.h>
#include <linux/gfp.h>
#include <linux/err.h>
+#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
+#define TWL4030_USB_SEL_MADC_MCPC (1<<3)
+#define TWL4030_USB_CARKIT_ANA_CTRL 0xBB
+
/**
* struct twl4030_madc_data - a container for madc info
* @dev: Pointer to device structure for madc
* @lock: Mutex protecting this data structure
+ * @regulator: Pointer to bias regulator for madc
* @requests: Array of request struct corresponding to SW1, SW2 and RT
* @use_second_irq: IRQ selection (main or co-processor)
* @imr: Interrupt mask register of MADC
@@ -60,6 +65,7 @@
struct twl4030_madc_data {
struct device *dev;
struct mutex lock; /* mutex protecting this data structure */
+ struct regulator *usb3v1;
struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
bool use_second_irq;
u8 imr;
@@ -841,6 +847,32 @@ static int twl4030_madc_probe(struct platform_device *pdev)
}
twl4030_madc = madc;
+ /* Configure MADC[3:6] */
+ ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
+ TWL4030_USB_CARKIT_ANA_CTRL);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL 0x%X\n",
+ TWL4030_USB_CARKIT_ANA_CTRL);
+ goto err_i2c;
+ }
+ regval |= TWL4030_USB_SEL_MADC_MCPC;
+ ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
+ TWL4030_USB_CARKIT_ANA_CTRL);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
+ TWL4030_USB_CARKIT_ANA_CTRL);
+ goto err_i2c;
+ }
+
+ /* Enable 3v1 bias regulator for MADC[3:6] */
+ madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
+ if (IS_ERR(madc->usb3v1))
+ return -ENODEV;
+
+ ret = regulator_enable(madc->usb3v1);
+ if (ret)
+ dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
+
ret = iio_device_register(iio_dev);
if (ret) {
dev_err(&pdev->dev, "could not register iio device\n");
@@ -866,6 +898,8 @@ static int twl4030_madc_remove(struct platform_device *pdev)
twl4030_madc_set_current_generator(madc, 0, 0);
twl4030_madc_set_power(madc, 0);
+ regulator_disable(madc->usb3v1);
+
return 0;
}
diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index 819632bf1..6bf4c20eb 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -68,6 +68,9 @@
#define VF610_ADC_CLK_DIV8 0x60
#define VF610_ADC_CLK_MASK 0x60
#define VF610_ADC_ADLSMP_LONG 0x10
+#define VF610_ADC_ADSTS_SHORT 0x100
+#define VF610_ADC_ADSTS_NORMAL 0x200
+#define VF610_ADC_ADSTS_LONG 0x300
#define VF610_ADC_ADSTS_MASK 0x300
#define VF610_ADC_ADLPC_EN 0x80
#define VF610_ADC_ADHSC_EN 0x400
@@ -98,6 +101,8 @@
#define VF610_ADC_CALF 0x2
#define VF610_ADC_TIMEOUT msecs_to_jiffies(100)
+#define DEFAULT_SAMPLE_TIME 1000
+
enum clk_sel {
VF610_ADCIOC_BUSCLK_SET,
VF610_ADCIOC_ALTCLK_SET,
@@ -124,6 +129,17 @@ enum conversion_mode_sel {
VF610_ADC_CONV_LOW_POWER,
};
+enum lst_adder_sel {
+ VF610_ADCK_CYCLES_3,
+ VF610_ADCK_CYCLES_5,
+ VF610_ADCK_CYCLES_7,
+ VF610_ADCK_CYCLES_9,
+ VF610_ADCK_CYCLES_13,
+ VF610_ADCK_CYCLES_17,
+ VF610_ADCK_CYCLES_21,
+ VF610_ADCK_CYCLES_25,
+};
+
struct vf610_adc_feature {
enum clk_sel clk_sel;
enum vol_ref vol_ref;
@@ -132,6 +148,8 @@ struct vf610_adc_feature {
int clk_div;
int sample_rate;
int res_mode;
+ u32 lst_adder_index;
+ u32 default_sample_time;
bool calibration;
bool ovwren;
@@ -155,11 +173,13 @@ struct vf610_adc {
};
static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
+static const u32 vf610_lst_adder[] = { 3, 5, 7, 9, 13, 17, 21, 25 };
static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
{
struct vf610_adc_feature *adc_feature = &info->adc_feature;
unsigned long adck_rate, ipg_rate = clk_get_rate(info->clk);
+ u32 adck_period, lst_addr_min;
int divisor, i;
adck_rate = info->max_adck_rate[adc_feature->conv_mode];
@@ -174,6 +194,19 @@ static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
}
/*
+ * Determine the long sample time adder value to be used based
+ * on the default minimum sample time provided.
+ */
+ adck_period = NSEC_PER_SEC / adck_rate;
+ lst_addr_min = adc_feature->default_sample_time / adck_period;
+ for (i = 0; i < ARRAY_SIZE(vf610_lst_adder); i++) {
+ if (vf610_lst_adder[i] > lst_addr_min) {
+ adc_feature->lst_adder_index = i;
+ break;
+ }
+ }
+
+ /*
* Calculate ADC sample frequencies
* Sample time unit is ADCK cycles. ADCK clk source is ipg clock,
* which is the same as bus clock.
@@ -182,12 +215,13 @@ static inline void vf610_adc_calculate_rates(struct vf610_adc *info)
* SFCAdder: fixed to 6 ADCK cycles
* AverageNum: 1, 4, 8, 16, 32 samples for hardware average.
* BCT (Base Conversion Time): fixed to 25 ADCK cycles for 12 bit mode
- * LSTAdder(Long Sample Time): fixed to 3 ADCK cycles
+ * LSTAdder(Long Sample Time): 3, 5, 7, 9, 13, 17, 21, 25 ADCK cycles
*/
adck_rate = ipg_rate / info->adc_feature.clk_div;
for (i = 0; i < ARRAY_SIZE(vf610_hw_avgs); i++)
info->sample_freq_avail[i] =
- adck_rate / (6 + vf610_hw_avgs[i] * (25 + 3));
+ adck_rate / (6 + vf610_hw_avgs[i] *
+ (25 + vf610_lst_adder[adc_feature->lst_adder_index]));
}
static inline void vf610_adc_cfg_init(struct vf610_adc *info)
@@ -347,8 +381,40 @@ static void vf610_adc_sample_set(struct vf610_adc *info)
break;
}
- /* Use the short sample mode */
- cfg_data &= ~(VF610_ADC_ADLSMP_LONG | VF610_ADC_ADSTS_MASK);
+ /*
+ * Set ADLSMP and ADSTS based on the Long Sample Time Adder value
+ * determined.
+ */
+ switch (adc_feature->lst_adder_index) {
+ case VF610_ADCK_CYCLES_3:
+ break;
+ case VF610_ADCK_CYCLES_5:
+ cfg_data |= VF610_ADC_ADSTS_SHORT;
+ break;
+ case VF610_ADCK_CYCLES_7:
+ cfg_data |= VF610_ADC_ADSTS_NORMAL;
+ break;
+ case VF610_ADCK_CYCLES_9:
+ cfg_data |= VF610_ADC_ADSTS_LONG;
+ break;
+ case VF610_ADCK_CYCLES_13:
+ cfg_data |= VF610_ADC_ADLSMP_LONG;
+ break;
+ case VF610_ADCK_CYCLES_17:
+ cfg_data |= VF610_ADC_ADLSMP_LONG;
+ cfg_data |= VF610_ADC_ADSTS_SHORT;
+ break;
+ case VF610_ADCK_CYCLES_21:
+ cfg_data |= VF610_ADC_ADLSMP_LONG;
+ cfg_data |= VF610_ADC_ADSTS_NORMAL;
+ break;
+ case VF610_ADCK_CYCLES_25:
+ cfg_data |= VF610_ADC_ADLSMP_LONG;
+ cfg_data |= VF610_ADC_ADSTS_NORMAL;
+ break;
+ default:
+ dev_err(info->dev, "error in sample time select\n");
+ }
/* update hardware average selection */
cfg_data &= ~VF610_ADC_AVGS_MASK;
@@ -713,6 +779,11 @@ static int vf610_adc_probe(struct platform_device *pdev)
of_property_read_u32_array(pdev->dev.of_node, "fsl,adck-max-frequency",
info->max_adck_rate, 3);
+ ret = of_property_read_u32(pdev->dev.of_node, "min-sample-time",
+ &info->adc_feature.default_sample_time);
+ if (ret)
+ info->adc_feature.default_sample_time = DEFAULT_SAMPLE_TIME;
+
platform_set_drvdata(pdev, indio_dev);
init_completion(&info->completion);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-04 16:06:31 +0000