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linux/drivers/mfd/ab8500-gpadc.c
Lee Jones bad76991d7 mfd: Register ab8500 devices using the newly DT:ed MFD API 
Now the MFD API is Device Tree aware we can use it for platform
registration again, even when booting with DT enabled. To aid in
Device Node pointer allocation we provide each cell with the
associative compatible string.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-07-09 00:16:13 +02:00

677 lines
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Author: Arun R Murthy <arun.murthy@stericsson.com>
* Author: Daniel Willerud <daniel.willerud@stericsson.com>
* Author: Johan Palsson <johan.palsson@stericsson.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
/*
* GPADC register offsets
* Bank : 0x0A
*/
#define AB8500_GPADC_CTRL1_REG 0x00
#define AB8500_GPADC_CTRL2_REG 0x01
#define AB8500_GPADC_CTRL3_REG 0x02
#define AB8500_GPADC_AUTO_TIMER_REG 0x03
#define AB8500_GPADC_STAT_REG 0x04
#define AB8500_GPADC_MANDATAL_REG 0x05
#define AB8500_GPADC_MANDATAH_REG 0x06
#define AB8500_GPADC_AUTODATAL_REG 0x07
#define AB8500_GPADC_AUTODATAH_REG 0x08
#define AB8500_GPADC_MUX_CTRL_REG 0x09
/*
* OTP register offsets
* Bank : 0x15
*/
#define AB8500_GPADC_CAL_1 0x0F
#define AB8500_GPADC_CAL_2 0x10
#define AB8500_GPADC_CAL_3 0x11
#define AB8500_GPADC_CAL_4 0x12
#define AB8500_GPADC_CAL_5 0x13
#define AB8500_GPADC_CAL_6 0x14
#define AB8500_GPADC_CAL_7 0x15
/* gpadc constants */
#define EN_VINTCORE12 0x04
#define EN_VTVOUT 0x02
#define EN_GPADC 0x01
#define DIS_GPADC 0x00
#define SW_AVG_16 0x60
#define ADC_SW_CONV 0x04
#define EN_ICHAR 0x80
#define BTEMP_PULL_UP 0x08
#define EN_BUF 0x40
#define DIS_ZERO 0x00
#define GPADC_BUSY 0x01
/* GPADC constants from AB8500 spec, UM0836 */
#define ADC_RESOLUTION 1024
#define ADC_CH_BTEMP_MIN 0
#define ADC_CH_BTEMP_MAX 1350
#define ADC_CH_DIETEMP_MIN 0
#define ADC_CH_DIETEMP_MAX 1350
#define ADC_CH_CHG_V_MIN 0
#define ADC_CH_CHG_V_MAX 20030
#define ADC_CH_ACCDET2_MIN 0
#define ADC_CH_ACCDET2_MAX 2500
#define ADC_CH_VBAT_MIN 2300
#define ADC_CH_VBAT_MAX 4800
#define ADC_CH_CHG_I_MIN 0
#define ADC_CH_CHG_I_MAX 1500
#define ADC_CH_BKBAT_MIN 0
#define ADC_CH_BKBAT_MAX 3200
/* This is used to not lose precision when dividing to get gain and offset */
#define CALIB_SCALE 1000
enum cal_channels {
ADC_INPUT_VMAIN = 0,
ADC_INPUT_BTEMP,
ADC_INPUT_VBAT,
NBR_CAL_INPUTS,
};
/**
* struct adc_cal_data - Table for storing gain and offset for the calibrated
* ADC channels
* @gain: Gain of the ADC channel
* @offset: Offset of the ADC channel
*/
struct adc_cal_data {
u64 gain;
u64 offset;
};
/**
* struct ab8500_gpadc - AB8500 GPADC device information
* @chip_id ABB chip id
* @dev: pointer to the struct device
* @node: a list of AB8500 GPADCs, hence prepared for
reentrance
* @ab8500_gpadc_complete: pointer to the struct completion, to indicate
* the completion of gpadc conversion
* @ab8500_gpadc_lock: structure of type mutex
* @regu: pointer to the struct regulator
* @irq: interrupt number that is used by gpadc
* @cal_data array of ADC calibration data structs
*/
struct ab8500_gpadc {
u8 chip_id;
struct device *dev;
struct list_head node;
struct completion ab8500_gpadc_complete;
struct mutex ab8500_gpadc_lock;
struct regulator *regu;
int irq;
struct adc_cal_data cal_data[NBR_CAL_INPUTS];
};
static LIST_HEAD(ab8500_gpadc_list);
/**
* ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC
* (i.e. the first GPADC in the instance list)
*/
struct ab8500_gpadc *ab8500_gpadc_get(char *name)
{
struct ab8500_gpadc *gpadc;
list_for_each_entry(gpadc, &ab8500_gpadc_list, node) {
if (!strcmp(name, dev_name(gpadc->dev)))
return gpadc;
}
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(ab8500_gpadc_get);
/**
* ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage
*/
int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
int ad_value)
{
int res;
switch (channel) {
case MAIN_CHARGER_V:
/* For some reason we don't have calibrated data */
if (!gpadc->cal_data[ADC_INPUT_VMAIN].gain) {
res = ADC_CH_CHG_V_MIN + (ADC_CH_CHG_V_MAX -
ADC_CH_CHG_V_MIN) * ad_value /
ADC_RESOLUTION;
break;
}
/* Here we can use the calibrated data */
res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VMAIN].gain +
gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE;
break;
case BAT_CTRL:
case BTEMP_BALL:
case ACC_DETECT1:
case ADC_AUX1:
case ADC_AUX2:
/* For some reason we don't have calibrated data */
if (!gpadc->cal_data[ADC_INPUT_BTEMP].gain) {
res = ADC_CH_BTEMP_MIN + (ADC_CH_BTEMP_MAX -
ADC_CH_BTEMP_MIN) * ad_value /
ADC_RESOLUTION;
break;
}
/* Here we can use the calibrated data */
res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_BTEMP].gain +
gpadc->cal_data[ADC_INPUT_BTEMP].offset) / CALIB_SCALE;
break;
case MAIN_BAT_V:
/* For some reason we don't have calibrated data */
if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) {
res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX -
ADC_CH_VBAT_MIN) * ad_value /
ADC_RESOLUTION;
break;
}
/* Here we can use the calibrated data */
res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VBAT].gain +
gpadc->cal_data[ADC_INPUT_VBAT].offset) / CALIB_SCALE;
break;
case DIE_TEMP:
res = ADC_CH_DIETEMP_MIN +
(ADC_CH_DIETEMP_MAX - ADC_CH_DIETEMP_MIN) * ad_value /
ADC_RESOLUTION;
break;
case ACC_DETECT2:
res = ADC_CH_ACCDET2_MIN +
(ADC_CH_ACCDET2_MAX - ADC_CH_ACCDET2_MIN) * ad_value /
ADC_RESOLUTION;
break;
case VBUS_V:
res = ADC_CH_CHG_V_MIN +
(ADC_CH_CHG_V_MAX - ADC_CH_CHG_V_MIN) * ad_value /
ADC_RESOLUTION;
break;
case MAIN_CHARGER_C:
case USB_CHARGER_C:
res = ADC_CH_CHG_I_MIN +
(ADC_CH_CHG_I_MAX - ADC_CH_CHG_I_MIN) * ad_value /
ADC_RESOLUTION;
break;
case BK_BAT_V:
res = ADC_CH_BKBAT_MIN +
(ADC_CH_BKBAT_MAX - ADC_CH_BKBAT_MIN) * ad_value /
ADC_RESOLUTION;
break;
default:
dev_err(gpadc->dev,
"unknown channel, not possible to convert\n");
res = -EINVAL;
break;
}
return res;
}
EXPORT_SYMBOL(ab8500_gpadc_ad_to_voltage);
/**
* ab8500_gpadc_convert() - gpadc conversion
* @channel: analog channel to be converted to digital data
*
* This function converts the selected analog i/p to digital
* data.
*/
int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 channel)
{
int ad_value;
int voltage;
ad_value = ab8500_gpadc_read_raw(gpadc, channel);
if (ad_value < 0) {
dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n", channel);
return ad_value;
}
voltage = ab8500_gpadc_ad_to_voltage(gpadc, channel, ad_value);
if (voltage < 0)
dev_err(gpadc->dev, "GPADC to voltage conversion failed ch:"
" %d AD: 0x%x\n", channel, ad_value);
return voltage;
}
EXPORT_SYMBOL(ab8500_gpadc_convert);
/**
* ab8500_gpadc_read_raw() - gpadc read
* @channel: analog channel to be read
*
* This function obtains the raw ADC value, this then needs
* to be converted by calling ab8500_gpadc_ad_to_voltage()
*/
int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
{
int ret;
int looplimit = 0;
u8 val, low_data, high_data;
if (!gpadc)
return -ENODEV;
mutex_lock(&gpadc->ab8500_gpadc_lock);
/* Enable VTVout LDO this is required for GPADC */
regulator_enable(gpadc->regu);
/* Check if ADC is not busy, lock and proceed */
do {
ret = abx500_get_register_interruptible(gpadc->dev,
AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
if (ret < 0)
goto out;
if (!(val & GPADC_BUSY))
break;
msleep(10);
} while (++looplimit < 10);
if (looplimit >= 10 && (val & GPADC_BUSY)) {
dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
ret = -EINVAL;
goto out;
}
/* Enable GPADC */
ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
if (ret < 0) {
dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
goto out;
}
/* Select the channel source and set average samples to 16 */
ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_CTRL2_REG, (channel | SW_AVG_16));
if (ret < 0) {
dev_err(gpadc->dev,
"gpadc_conversion: set avg samples failed\n");
goto out;
}
/*
* Enable ADC, buffering, select rising edge and enable ADC path
* charging current sense if it needed, ABB 3.0 needs some special
* treatment too.
*/
switch (channel) {
case MAIN_CHARGER_C:
case USB_CHARGER_C:
ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
EN_BUF | EN_ICHAR,
EN_BUF | EN_ICHAR);
break;
case BTEMP_BALL:
if (gpadc->chip_id >= AB8500_CUT3P0) {
/* Turn on btemp pull-up on ABB 3.0 */
ret = abx500_mask_and_set_register_interruptible(
gpadc->dev,
AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
EN_BUF | BTEMP_PULL_UP,
EN_BUF | BTEMP_PULL_UP);
/*
* Delay might be needed for ABB8500 cut 3.0, if not, remove
* when hardware will be availible
*/
msleep(1);
break;
}
/* Intentional fallthrough */
default:
ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
break;
}
if (ret < 0) {
dev_err(gpadc->dev,
"gpadc_conversion: select falling edge failed\n");
goto out;
}
ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
if (ret < 0) {
dev_err(gpadc->dev,
"gpadc_conversion: start s/w conversion failed\n");
goto out;
}
/* wait for completion of conversion */
if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete, 2*HZ)) {
dev_err(gpadc->dev,
"timeout: didn't receive GPADC conversion interrupt\n");
ret = -EINVAL;
goto out;
}
/* Read the converted RAW data */
ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_MANDATAL_REG, &low_data);
if (ret < 0) {
dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
goto out;
}
ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_MANDATAH_REG, &high_data);
if (ret < 0) {
dev_err(gpadc->dev,
"gpadc_conversion: read high data failed\n");
goto out;
}
/* Disable GPADC */
ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_CTRL1_REG, DIS_GPADC);
if (ret < 0) {
dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
goto out;
}
/* Disable VTVout LDO this is required for GPADC */
regulator_disable(gpadc->regu);
mutex_unlock(&gpadc->ab8500_gpadc_lock);
return (high_data << 8) | low_data;
out:
/*
* It has shown to be needed to turn off the GPADC if an error occurs,
* otherwise we might have problem when waiting for the busy bit in the
* GPADC status register to go low. In V1.1 there wait_for_completion
* seems to timeout when waiting for an interrupt.. Not seen in V2.0
*/
(void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_CTRL1_REG, DIS_GPADC);
regulator_disable(gpadc->regu);
mutex_unlock(&gpadc->ab8500_gpadc_lock);
dev_err(gpadc->dev,
"gpadc_conversion: Failed to AD convert channel %d\n", channel);
return ret;
}
EXPORT_SYMBOL(ab8500_gpadc_read_raw);
/**
* ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion
* @irq: irq number
* @data: pointer to the data passed during request irq
*
* This is a interrupt service routine for s/w gpadc conversion completion.
* Notifies the gpadc completion is completed and the converted raw value
* can be read from the registers.
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc)
{
struct ab8500_gpadc *gpadc = _gpadc;
complete(&gpadc->ab8500_gpadc_complete);
return IRQ_HANDLED;
}
static int otp_cal_regs[] = {
AB8500_GPADC_CAL_1,
AB8500_GPADC_CAL_2,
AB8500_GPADC_CAL_3,
AB8500_GPADC_CAL_4,
AB8500_GPADC_CAL_5,
AB8500_GPADC_CAL_6,
AB8500_GPADC_CAL_7,
};
static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
{
int i;
int ret[ARRAY_SIZE(otp_cal_regs)];
u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
int vmain_high, vmain_low;
int btemp_high, btemp_low;
int vbat_high, vbat_low;
/* First we read all OTP registers and store the error code */
for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
ret[i] = abx500_get_register_interruptible(gpadc->dev,
AB8500_OTP_EMUL, otp_cal_regs[i], &gpadc_cal[i]);
if (ret[i] < 0)
dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n",
__func__, otp_cal_regs[i]);
}
/*
* The ADC calibration data is stored in OTP registers.
* The layout of the calibration data is outlined below and a more
* detailed description can be found in UM0836
*
* vm_h/l = vmain_high/low
* bt_h/l = btemp_high/low
* vb_h/l = vbat_high/low
*
* Data bits:
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
* |.......|.......|.......|.......|.......|.......|.......|.......
* | | vm_h9 | vm_h8
* |.......|.......|.......|.......|.......|.......|.......|.......
* | | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
* |.......|.......|.......|.......|.......|.......|.......|.......
* | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
* |.......|.......|.......|.......|.......|.......|.......|.......
* | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
* |.......|.......|.......|.......|.......|.......|.......|.......
* | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
* |.......|.......|.......|.......|.......|.......|.......|.......
* | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
* |.......|.......|.......|.......|.......|.......|.......|.......
* | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
* |.......|.......|.......|.......|.......|.......|.......|.......
*
*
* Ideal output ADC codes corresponding to injected input voltages
* during manufacturing is:
*
* vmain_high: Vin = 19500mV / ADC ideal code = 997
* vmain_low: Vin = 315mV / ADC ideal code = 16
* btemp_high: Vin = 1300mV / ADC ideal code = 985
* btemp_low: Vin = 21mV / ADC ideal code = 16
* vbat_high: Vin = 4700mV / ADC ideal code = 982
* vbat_low: Vin = 2380mV / ADC ideal code = 33
*/
/* Calculate gain and offset for VMAIN if all reads succeeded */
if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
((gpadc_cal[1] & 0x3F) << 2) |
((gpadc_cal[2] & 0xC0) >> 6));
vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
(19500 - 315) / (vmain_high - vmain_low);
gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE * 19500 -
(CALIB_SCALE * (19500 - 315) /
(vmain_high - vmain_low)) * vmain_high;
} else {
gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
}
/* Calculate gain and offset for BTEMP if all reads succeeded */
if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
(gpadc_cal[3] << 1) |
((gpadc_cal[4] & 0x80) >> 7));
btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
gpadc->cal_data[ADC_INPUT_BTEMP].gain =
CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 -
(CALIB_SCALE * (1300 - 21) /
(btemp_high - btemp_low)) * btemp_high;
} else {
gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0;
}
/* Calculate gain and offset for VBAT if all reads succeeded */
if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) {
vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE *
(4700 - 2380) / (vbat_high - vbat_low);
gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 -
(CALIB_SCALE * (4700 - 2380) /
(vbat_high - vbat_low)) * vbat_high;
} else {
gpadc->cal_data[ADC_INPUT_VBAT].gain = 0;
}
dev_dbg(gpadc->dev, "VMAIN gain %llu offset %llu\n",
gpadc->cal_data[ADC_INPUT_VMAIN].gain,
gpadc->cal_data[ADC_INPUT_VMAIN].offset);
dev_dbg(gpadc->dev, "BTEMP gain %llu offset %llu\n",
gpadc->cal_data[ADC_INPUT_BTEMP].gain,
gpadc->cal_data[ADC_INPUT_BTEMP].offset);
dev_dbg(gpadc->dev, "VBAT gain %llu offset %llu\n",
gpadc->cal_data[ADC_INPUT_VBAT].gain,
gpadc->cal_data[ADC_INPUT_VBAT].offset);
}
static int __devinit ab8500_gpadc_probe(struct platform_device *pdev)
{
int ret = 0;
struct ab8500_gpadc *gpadc;
gpadc = kzalloc(sizeof(struct ab8500_gpadc), GFP_KERNEL);
if (!gpadc) {
dev_err(&pdev->dev, "Error: No memory\n");
return -ENOMEM;
}
gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
if (gpadc->irq < 0) {
dev_err(&pdev->dev, "failed to get platform irq-%d\n",
gpadc->irq);
ret = gpadc->irq;
goto fail;
}
gpadc->dev = &pdev->dev;
mutex_init(&gpadc->ab8500_gpadc_lock);
/* Initialize completion used to notify completion of conversion */
init_completion(&gpadc->ab8500_gpadc_complete);
/* Register interrupt - SwAdcComplete */
ret = request_threaded_irq(gpadc->irq, NULL,
ab8500_bm_gpswadcconvend_handler,
IRQF_ONESHOT | IRQF_NO_SUSPEND | IRQF_SHARED,
"ab8500-gpadc", gpadc);
if (ret < 0) {
dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n",
gpadc->irq);
goto fail;
}
/* Get Chip ID of the ABB ASIC */
ret = abx500_get_chip_id(gpadc->dev);
if (ret < 0) {
dev_err(gpadc->dev, "failed to get chip ID\n");
goto fail_irq;
}
gpadc->chip_id = (u8) ret;
/* VTVout LDO used to power up ab8500-GPADC */
gpadc->regu = regulator_get(&pdev->dev, "vddadc");
if (IS_ERR(gpadc->regu)) {
ret = PTR_ERR(gpadc->regu);
dev_err(gpadc->dev, "failed to get vtvout LDO\n");
goto fail_irq;
}
ab8500_gpadc_read_calibration_data(gpadc);
list_add_tail(&gpadc->node, &ab8500_gpadc_list);
dev_dbg(gpadc->dev, "probe success\n");
return 0;
fail_irq:
free_irq(gpadc->irq, gpadc);
fail:
kfree(gpadc);
gpadc = NULL;
return ret;
}
static int __devexit ab8500_gpadc_remove(struct platform_device *pdev)
{
struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);
/* remove this gpadc entry from the list */
list_del(&gpadc->node);
/* remove interrupt - completion of Sw ADC conversion */
free_irq(gpadc->irq, gpadc);
/* disable VTVout LDO that is being used by GPADC */
regulator_put(gpadc->regu);
kfree(gpadc);
gpadc = NULL;
return 0;
}
static struct platform_driver ab8500_gpadc_driver = {
.probe = ab8500_gpadc_probe,
.remove = __devexit_p(ab8500_gpadc_remove),
.driver = {
.name = "ab8500-gpadc",
.owner = THIS_MODULE,
},
};
static int __init ab8500_gpadc_init(void)
{
return platform_driver_register(&ab8500_gpadc_driver);
}
static void __exit ab8500_gpadc_exit(void)
{
platform_driver_unregister(&ab8500_gpadc_driver);
}
subsys_initcall_sync(ab8500_gpadc_init);
module_exit(ab8500_gpadc_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson");
MODULE_ALIAS("platform:ab8500_gpadc");
MODULE_DESCRIPTION("AB8500 GPADC driver");
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