[PATCH 01/01] MFD: add ADC support to DA9052/53 MFD core v2

From: Ashish Jangam
Date: Fri Jan 13 2012 - 09:35:43 EST

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This patch add ADC support for DA9052/53 MFD core so that its dependent
components like Battery & HWMON can read required values from ADC channel.

Signed-off-by: David Dajun Chen <dchen@xxxxxxxxxxx>
Signed-off-by: Ashish Jangam <ashish.jangam@xxxxxxxxxxxxxxx>
---
Changes since v1:
- Remove list handling as there is single active request at any time
---
drivers/mfd/da9052-core.c | 133 +++++++++++++++++++++++++++++++++++++
include/linux/mfd/da9052/da9052.h | 17 +++++
2 files changed, 150 insertions(+), 0 deletions(-)
diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
index 5ddde2a..99e2262 100644
--- a/drivers/mfd/da9052-core.c
+++ b/drivers/mfd/da9052-core.c
@@ -319,6 +319,130 @@ 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
+};
+
+struct completion done;
+
+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 */
+ wait_for_completion_timeout(&done, msecs_to_jiffies(500));
+
+ 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)
+{
+ complete(&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,
@@ -648,6 +772,8 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
int ret;

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

if (pdata && pdata->init != NULL)
pdata->init(da9052);
@@ -669,6 +795,13 @@ 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_base + DA9052_IRQ_ADC_EOM,
+ NULL, da9052_auxadc_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "adc irq", NULL);
+ 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)
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index 5702d1b..04d90b7 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -33,6 +33,18 @@

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

+/* 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
@@ -77,6 +89,7 @@ struct da9052_pdata;

struct da9052 {
struct mutex io_lock;
+ struct mutex auxadc_lock;

struct device *dev;
struct regmap *regmap;
@@ -87,6 +100,10 @@ struct da9052 {
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)
{

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Next message: Rajanikanth H V: "RE: tty/serial: Need clarification on Support for 4+M Baudrate"
Previous message: Shawn Guo: "Re: [RFC v2 4/9] of: add clock providers"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]