mfd: Reentrance and revamp ab8500 gpadc fetching interface
This revamps the interface so that AB8500 GPADCs are fetched by name. Probed GPADCs are added to a list and this list is searched for a matching GPADC. This makes it possible to have multiple AB8500 GPADC instances instead of it being a singleton, and rids the need to keep a GPADC pointer around in the core AB8500 MFD struct. Currently the match is made to the device name which is by default numbered from the device instance such as "ab8500-gpadc.0" but by using the .init_name field of the device a more intiutive naming for the GPADC blocks can be achieved if desired. Signed-off-by: Daniel Willerud <daniel.willerud@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
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cf16943947
Коммит
6321992cd3
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@ -3,6 +3,7 @@
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*
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* License Terms: GNU General Public License v2
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* Author: Arun R Murthy <arun.murthy@stericsson.com>
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* Author: Daniel Willerud <daniel.willerud@stericsson.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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@ -15,6 +16,7 @@
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/mfd/ab8500.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/ab8500/ab8500-gpadc.h>
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@ -48,21 +50,41 @@
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/**
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* struct ab8500_gpadc - ab8500 GPADC device information
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* @dev: pointer to the struct device
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* @parent: pointer to the parent device structure ab8500
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* @node: a list of AB8500 GPADCs, hence prepared for
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reentrance
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* @ab8500_gpadc_complete: pointer to the struct completion, to indicate
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* the completion of gpadc conversion
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* @ab8500_gpadc_lock: structure of type mutex
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* @regu: pointer to the struct regulator
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* @irq: interrupt number that is used by gpadc
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*/
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static struct ab8500_gpadc {
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struct ab8500_gpadc {
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struct device *dev;
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struct ab8500 *parent;
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struct list_head node;
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struct completion ab8500_gpadc_complete;
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struct mutex ab8500_gpadc_lock;
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struct regulator *regu;
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int irq;
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} *di;
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};
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static LIST_HEAD(ab8500_gpadc_list);
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/**
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* ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC
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* (i.e. the first GPADC in the instance list)
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*/
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struct ab8500_gpadc *ab8500_gpadc_get(char *name)
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{
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struct ab8500_gpadc *gpadc;
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list_for_each_entry(gpadc, &ab8500_gpadc_list, node) {
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if (!strcmp(name, dev_name(gpadc->dev)))
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return gpadc;
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}
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return ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL(ab8500_gpadc_get);
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/**
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* ab8500_gpadc_convert() - gpadc conversion
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@ -72,24 +94,24 @@ static struct ab8500_gpadc {
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* data. Thereafter calibration has to be made to obtain the
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* data in the required quantity measurement.
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*/
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int ab8500_gpadc_convert(u8 input)
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int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input)
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{
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int ret;
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u16 data = 0;
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int looplimit = 0;
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u8 val, low_data, high_data;
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if (!di)
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if (!gpadc)
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return -ENODEV;
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mutex_lock(&di->ab8500_gpadc_lock);
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mutex_lock(&gpadc->ab8500_gpadc_lock);
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/* Enable VTVout LDO this is required for GPADC */
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regulator_enable(di->regu);
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regulator_enable(gpadc->regu);
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/* Check if ADC is not busy, lock and proceed */
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do {
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ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
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AB8500_GPADC_STAT_REG, &val);
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ret = abx500_get_register_interruptible(gpadc->dev,
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AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
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if (ret < 0)
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goto out;
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if (!(val & GPADC_BUSY))
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@ -97,75 +119,76 @@ int ab8500_gpadc_convert(u8 input)
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msleep(10);
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} while (++looplimit < 10);
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if (looplimit >= 10 && (val & GPADC_BUSY)) {
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dev_err(di->dev, "gpadc_conversion: GPADC busy");
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dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
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ret = -EINVAL;
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goto out;
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}
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/* Enable GPADC */
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ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
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ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
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AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
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if (ret < 0) {
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dev_err(di->dev, "gpadc_conversion: enable gpadc failed\n");
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dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
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goto out;
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}
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/* Select the input source and set average samples to 16 */
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ret = abx500_set_register_interruptible(di->dev, AB8500_GPADC,
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ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL2_REG, (input | SW_AVG_16));
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if (ret < 0) {
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dev_err(di->dev,
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dev_err(gpadc->dev,
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"gpadc_conversion: set avg samples failed\n");
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goto out;
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}
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/* Enable ADC, Buffering and select rising edge, start Conversion */
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ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
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ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
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AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
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if (ret < 0) {
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dev_err(di->dev,
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dev_err(gpadc->dev,
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"gpadc_conversion: select falling edge failed\n");
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goto out;
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}
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ret = abx500_mask_and_set_register_interruptible(di->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
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ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
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AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
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if (ret < 0) {
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dev_err(di->dev,
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dev_err(gpadc->dev,
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"gpadc_conversion: start s/w conversion failed\n");
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goto out;
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}
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/* wait for completion of conversion */
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if (!wait_for_completion_timeout(&di->ab8500_gpadc_complete, 2*HZ)) {
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dev_err(di->dev,
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if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete, 2*HZ)) {
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dev_err(gpadc->dev,
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"timeout: didnt recieve GPADC conversion interrupt\n");
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ret = -EINVAL;
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goto out;
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}
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/* Read the converted RAW data */
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ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
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ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
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AB8500_GPADC_MANDATAL_REG, &low_data);
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if (ret < 0) {
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dev_err(di->dev, "gpadc_conversion: read low data failed\n");
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dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
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goto out;
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}
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ret = abx500_get_register_interruptible(di->dev, AB8500_GPADC,
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ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
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AB8500_GPADC_MANDATAH_REG, &high_data);
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if (ret < 0) {
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dev_err(di->dev, "gpadc_conversion: read high data failed\n");
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dev_err(gpadc->dev,
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"gpadc_conversion: read high data failed\n");
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goto out;
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}
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data = (high_data << 8) | low_data;
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/* Disable GPADC */
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ret = abx500_set_register_interruptible(di->dev, AB8500_GPADC,
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ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL1_REG, DIS_GPADC);
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if (ret < 0) {
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dev_err(di->dev, "gpadc_conversion: disable gpadc failed\n");
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dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
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goto out;
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}
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/* Disable VTVout LDO this is required for GPADC */
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regulator_disable(di->regu);
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mutex_unlock(&di->ab8500_gpadc_lock);
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regulator_disable(gpadc->regu);
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mutex_unlock(&gpadc->ab8500_gpadc_lock);
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return data;
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out:
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* GPADC status register to go low. In V1.1 there wait_for_completion
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* seems to timeout when waiting for an interrupt.. Not seen in V2.0
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*/
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(void) abx500_set_register_interruptible(di->dev, AB8500_GPADC,
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(void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
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AB8500_GPADC_CTRL1_REG, DIS_GPADC);
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regulator_disable(di->regu);
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mutex_unlock(&di->ab8500_gpadc_lock);
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dev_err(di->dev, "gpadc_conversion: Failed to AD convert channel %d\n",
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input);
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regulator_disable(gpadc->regu);
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mutex_unlock(&gpadc->ab8500_gpadc_lock);
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dev_err(gpadc->dev,
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"gpadc_conversion: Failed to AD convert channel %d\n", input);
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return ret;
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}
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EXPORT_SYMBOL(ab8500_gpadc_convert);
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* can be read from the registers.
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* Returns IRQ status(IRQ_HANDLED)
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*/
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static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_di)
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static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc)
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{
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struct ab8500_gpadc *gpadc = _di;
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struct ab8500_gpadc *gpadc = _gpadc;
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complete(&gpadc->ab8500_gpadc_complete);
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@ -215,16 +238,16 @@ static int __devinit ab8500_gpadc_probe(struct platform_device *pdev)
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return -ENOMEM;
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}
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gpadc->parent = dev_get_drvdata(pdev->dev.parent);
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gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
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if (gpadc->irq < 0) {
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dev_err(gpadc->dev, "failed to get platform irq-%d\n", di->irq);
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dev_err(gpadc->dev, "failed to get platform irq-%d\n",
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gpadc->irq);
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ret = gpadc->irq;
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goto fail;
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}
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gpadc->dev = &pdev->dev;
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mutex_init(&di->ab8500_gpadc_lock);
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mutex_init(&gpadc->ab8500_gpadc_lock);
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/* Initialize completion used to notify completion of conversion */
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init_completion(&gpadc->ab8500_gpadc_complete);
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dev_err(gpadc->dev, "failed to get vtvout LDO\n");
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goto fail;
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}
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di = gpadc;
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list_add_tail(&gpadc->node, &ab8500_gpadc_list);
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dev_dbg(gpadc->dev, "probe success\n");
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return 0;
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fail:
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@ -259,8 +282,10 @@ static int __devexit ab8500_gpadc_remove(struct platform_device *pdev)
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{
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struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);
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/* remove this gpadc entry from the list */
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list_del(&gpadc->node);
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/* remove interrupt - completion of Sw ADC conversion */
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free_irq(gpadc->irq, di);
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free_irq(gpadc->irq, gpadc);
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/* disable VTVout LDO that is being used by GPADC */
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regulator_put(gpadc->regu);
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kfree(gpadc);
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@ -291,6 +316,6 @@ subsys_initcall_sync(ab8500_gpadc_init);
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module_exit(ab8500_gpadc_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Arun R Murthy");
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MODULE_AUTHOR("Arun R Murthy, Daniel Willerud");
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MODULE_ALIAS("platform:ab8500_gpadc");
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MODULE_DESCRIPTION("AB8500 GPADC driver");
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@ -3,6 +3,7 @@
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* Licensed under GPLv2.
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*
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* Author: Arun R Murthy <arun.murthy@stericsson.com>
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* Author: Daniel Willerud <daniel.willerud@stericsson.com>
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*/
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#ifndef _AB8500_GPADC_H
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@ -23,6 +24,9 @@
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#define BK_BAT_V 0x0C
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#define DIE_TEMP 0x0D
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int ab8500_gpadc_convert(u8 input);
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struct ab8500_gpadc;
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struct ab8500_gpadc *ab8500_gpadc_get(char *name);
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int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 input);
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#endif /* _AB8500_GPADC_H */
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