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mfd: Add ADC support to the DA9052/53 core
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This patch adds ADC support to the DA9052/53 core.

Tested on smdkv6410 and i.mx53 QS boards.

Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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Ashish Jangam authored and Samuel Ortiz committed May 20, 2012
1 parent 21f7541 commit 16e5e20
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140 changes: 140 additions & 0 deletions drivers/mfd/da9052-core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -318,6 +318,135 @@ static bool da9052_reg_volatile(struct device *dev, unsigned int reg)
}
}

/*
* TBAT look-up table is computed from the R90 reg (8 bit register)
* reading as below. The battery temperature is in milliCentigrade
* TBAT = (1/(t1+1/298) - 273) * 1000 mC
* where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
* Default values are R25 = 10e3, B = 3380, ITBAT = 50e-6
* Example:
* R25=10E3, B=3380, ITBAT=50e-6, ADCVAL=62d calculates
* TBAT = 20015 mili degrees Centrigrade
*
*/
static const int32_t tbat_lookup[255] = {
183258, 144221, 124334, 111336, 101826, 94397, 88343, 83257,
78889, 75071, 71688, 68656, 65914, 63414, 61120, 59001,
570366, 55204, 53490, 51881, 50364, 48931, 47574, 46285,
45059, 43889, 42772, 41703, 40678, 39694, 38748, 37838,
36961, 36115, 35297, 34507, 33743, 33002, 32284, 31588,
30911, 30254, 29615, 28994, 28389, 27799, 27225, 26664,
26117, 25584, 25062, 24553, 24054, 23567, 23091, 22624,
22167, 21719, 21281, 20851, 20429, 20015, 19610, 19211,
18820, 18436, 18058, 17688, 17323, 16965, 16612, 16266,
15925, 15589, 15259, 14933, 14613, 14298, 13987, 13681,
13379, 13082, 12788, 12499, 12214, 11933, 11655, 11382,
11112, 10845, 10582, 10322, 10066, 9812, 9562, 9315,
9071, 8830, 8591, 8356, 8123, 7893, 7665, 7440,
7218, 6998, 6780, 6565, 6352, 6141, 5933, 5726,
5522, 5320, 5120, 4922, 4726, 4532, 4340, 4149,
3961, 3774, 3589, 3406, 3225, 3045, 2867, 2690,
2516, 2342, 2170, 2000, 1831, 1664, 1498, 1334,
1171, 1009, 849, 690, 532, 376, 221, 67,
-84, -236, -386, -535, -683, -830, -975, -1119,
-1263, -1405, -1546, -1686, -1825, -1964, -2101, -2237,
-2372, -2506, -2639, -2771, -2902, -3033, -3162, -3291,
-3418, -3545, -3671, -3796, -3920, -4044, -4166, -4288,
-4409, -4529, -4649, -4767, -4885, -5002, -5119, -5235,
-5349, -5464, -5577, -5690, -5802, -5913, -6024, -6134,
-6244, -6352, -6461, -6568, -6675, -6781, -6887, -6992,
-7096, -7200, -7303, -7406, -7508, -7609, -7710, -7810,
-7910, -8009, -8108, -8206, -8304, -8401, -8497, -8593,
-8689, -8784, -8878, -8972, -9066, -9159, -9251, -9343,
-9435, -9526, -9617, -9707, -9796, -9886, -9975, -10063,
-10151, -10238, -10325, -10412, -10839, -10923, -11007, -11090,
-11173, -11256, -11338, -11420, -11501, -11583, -11663, -11744,
-11823, -11903, -11982
};

static const u8 chan_mux[DA9052_ADC_VBBAT + 1] = {
[DA9052_ADC_VDDOUT] = DA9052_ADC_MAN_MUXSEL_VDDOUT,
[DA9052_ADC_ICH] = DA9052_ADC_MAN_MUXSEL_ICH,
[DA9052_ADC_TBAT] = DA9052_ADC_MAN_MUXSEL_TBAT,
[DA9052_ADC_VBAT] = DA9052_ADC_MAN_MUXSEL_VBAT,
[DA9052_ADC_IN4] = DA9052_ADC_MAN_MUXSEL_AD4,
[DA9052_ADC_IN5] = DA9052_ADC_MAN_MUXSEL_AD5,
[DA9052_ADC_IN6] = DA9052_ADC_MAN_MUXSEL_AD6,
[DA9052_ADC_VBBAT] = DA9052_ADC_MAN_MUXSEL_VBBAT
};

int da9052_adc_manual_read(struct da9052 *da9052, unsigned char channel)
{
int ret;
unsigned short calc_data;
unsigned short data;
unsigned char mux_sel;

if (channel > DA9052_ADC_VBBAT)
return -EINVAL;

mutex_lock(&da9052->auxadc_lock);

/* Channel gets activated on enabling the Conversion bit */
mux_sel = chan_mux[channel] | DA9052_ADC_MAN_MAN_CONV;

ret = da9052_reg_write(da9052, DA9052_ADC_MAN_REG, mux_sel);
if (ret < 0)
goto err;

/* Wait for an interrupt */
if (!wait_for_completion_timeout(&da9052->done,
msecs_to_jiffies(500))) {
dev_err(da9052->dev,
"timeout waiting for ADC conversion interrupt\n");
ret = -ETIMEDOUT;
goto err;
}

ret = da9052_reg_read(da9052, DA9052_ADC_RES_H_REG);
if (ret < 0)
goto err;

calc_data = (unsigned short)ret;
data = calc_data << 2;

ret = da9052_reg_read(da9052, DA9052_ADC_RES_L_REG);
if (ret < 0)
goto err;

calc_data = (unsigned short)(ret & DA9052_ADC_RES_LSB);
data |= calc_data;

ret = data;

err:
mutex_unlock(&da9052->auxadc_lock);
return ret;
}
EXPORT_SYMBOL_GPL(da9052_adc_manual_read);

static irqreturn_t da9052_auxadc_irq(int irq, void *irq_data)
{
struct da9052 *da9052 = irq_data;

complete(&da9052->done);

return IRQ_HANDLED;
}

int da9052_adc_read_temp(struct da9052 *da9052)
{
int tbat;

tbat = da9052_reg_read(da9052, DA9052_TBAT_RES_REG);
if (tbat <= 0)
return tbat;

/* ARRAY_SIZE check is not needed since TBAT is a 8-bit register */
return tbat_lookup[tbat - 1];
}
EXPORT_SYMBOL_GPL(da9052_adc_read_temp);

static struct resource da9052_rtc_resource = {
.name = "ALM",
.start = DA9052_IRQ_ALARM,
Expand Down Expand Up @@ -646,6 +775,9 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
struct irq_desc *desc;
int ret;

mutex_init(&da9052->auxadc_lock);
init_completion(&da9052->done);

if (pdata && pdata->init != NULL)
pdata->init(da9052);

Expand All @@ -666,6 +798,12 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
desc = irq_to_desc(da9052->chip_irq);
da9052->irq_base = regmap_irq_chip_get_base(desc->action->dev_id);

ret = request_threaded_irq(DA9052_IRQ_ADC_EOM, NULL, da9052_auxadc_irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"adc irq", da9052);
if (ret != 0)
dev_err(da9052->dev, "DA9052 ADC IRQ failed ret=%d\n", ret);

ret = mfd_add_devices(da9052->dev, -1, da9052_subdev_info,
ARRAY_SIZE(da9052_subdev_info), NULL, 0);
if (ret)
Expand All @@ -674,13 +812,15 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
return 0;

err:
free_irq(DA9052_IRQ_ADC_EOM, da9052);
mfd_remove_devices(da9052->dev);
regmap_err:
return ret;
}

void da9052_device_exit(struct da9052 *da9052)
{
free_irq(DA9052_IRQ_ADC_EOM, da9052);
regmap_del_irq_chip(da9052->chip_irq,
irq_get_irq_data(da9052->irq_base)->chip_data);
mfd_remove_devices(da9052->dev);
Expand Down
19 changes: 19 additions & 0 deletions include/linux/mfd/da9052/da9052.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,18 @@

#include <linux/mfd/da9052/reg.h>

/* Common - HWMON Channel Definations */
#define DA9052_ADC_VDDOUT 0
#define DA9052_ADC_ICH 1
#define DA9052_ADC_TBAT 2
#define DA9052_ADC_VBAT 3
#define DA9052_ADC_IN4 4
#define DA9052_ADC_IN5 5
#define DA9052_ADC_IN6 6
#define DA9052_ADC_TSI 7
#define DA9052_ADC_TJUNC 8
#define DA9052_ADC_VBBAT 9

#define DA9052_IRQ_DCIN 0
#define DA9052_IRQ_VBUS 1
#define DA9052_IRQ_DCINREM 2
Expand Down Expand Up @@ -79,12 +91,19 @@ struct da9052 {
struct device *dev;
struct regmap *regmap;

struct mutex auxadc_lock;
struct completion done;

int irq_base;
u8 chip_id;

int chip_irq;
};

/* ADC API */
int da9052_adc_manual_read(struct da9052 *da9052, unsigned char channel);
int da9052_adc_read_temp(struct da9052 *da9052);

/* Device I/O API */
static inline int da9052_reg_read(struct da9052 *da9052, unsigned char reg)
{
Expand Down

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