forked from Minki/linux
mfd: Add ADC support to the DA9052/53 core
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>
This commit is contained in:
Ashish Jangam
Samuel Ortiz
parent
21f7541d88
commit
16e5e204c9
@ -318,6 +318,135 @@ static bool da9052_reg_volatile(struct device *dev, unsigned int reg)
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}
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}
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/*
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* TBAT look-up table is computed from the R90 reg (8 bit register)
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* reading as below. The battery temperature is in milliCentigrade
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* TBAT = (1/(t1+1/298) - 273) * 1000 mC
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* where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
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* Default values are R25 = 10e3, B = 3380, ITBAT = 50e-6
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* Example:
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* R25=10E3, B=3380, ITBAT=50e-6, ADCVAL=62d calculates
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* TBAT = 20015 mili degrees Centrigrade
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*
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*/
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static const int32_t tbat_lookup[255] = {
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183258, 144221, 124334, 111336, 101826, 94397, 88343, 83257,
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78889, 75071, 71688, 68656, 65914, 63414, 61120, 59001,
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570366, 55204, 53490, 51881, 50364, 48931, 47574, 46285,
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45059, 43889, 42772, 41703, 40678, 39694, 38748, 37838,
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36961, 36115, 35297, 34507, 33743, 33002, 32284, 31588,
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30911, 30254, 29615, 28994, 28389, 27799, 27225, 26664,
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26117, 25584, 25062, 24553, 24054, 23567, 23091, 22624,
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22167, 21719, 21281, 20851, 20429, 20015, 19610, 19211,
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18820, 18436, 18058, 17688, 17323, 16965, 16612, 16266,
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15925, 15589, 15259, 14933, 14613, 14298, 13987, 13681,
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13379, 13082, 12788, 12499, 12214, 11933, 11655, 11382,
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11112, 10845, 10582, 10322, 10066, 9812, 9562, 9315,
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9071, 8830, 8591, 8356, 8123, 7893, 7665, 7440,
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7218, 6998, 6780, 6565, 6352, 6141, 5933, 5726,
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5522, 5320, 5120, 4922, 4726, 4532, 4340, 4149,
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3961, 3774, 3589, 3406, 3225, 3045, 2867, 2690,
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2516, 2342, 2170, 2000, 1831, 1664, 1498, 1334,
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1171, 1009, 849, 690, 532, 376, 221, 67,
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-84, -236, -386, -535, -683, -830, -975, -1119,
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-1263, -1405, -1546, -1686, -1825, -1964, -2101, -2237,
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-2372, -2506, -2639, -2771, -2902, -3033, -3162, -3291,
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-3418, -3545, -3671, -3796, -3920, -4044, -4166, -4288,
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-4409, -4529, -4649, -4767, -4885, -5002, -5119, -5235,
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-5349, -5464, -5577, -5690, -5802, -5913, -6024, -6134,
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-6244, -6352, -6461, -6568, -6675, -6781, -6887, -6992,
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-7096, -7200, -7303, -7406, -7508, -7609, -7710, -7810,
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-7910, -8009, -8108, -8206, -8304, -8401, -8497, -8593,
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-8689, -8784, -8878, -8972, -9066, -9159, -9251, -9343,
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-9435, -9526, -9617, -9707, -9796, -9886, -9975, -10063,
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-10151, -10238, -10325, -10412, -10839, -10923, -11007, -11090,
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-11173, -11256, -11338, -11420, -11501, -11583, -11663, -11744,
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-11823, -11903, -11982
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};
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static const u8 chan_mux[DA9052_ADC_VBBAT + 1] = {
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[DA9052_ADC_VDDOUT] = DA9052_ADC_MAN_MUXSEL_VDDOUT,
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[DA9052_ADC_ICH] = DA9052_ADC_MAN_MUXSEL_ICH,
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[DA9052_ADC_TBAT] = DA9052_ADC_MAN_MUXSEL_TBAT,
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[DA9052_ADC_VBAT] = DA9052_ADC_MAN_MUXSEL_VBAT,
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[DA9052_ADC_IN4] = DA9052_ADC_MAN_MUXSEL_AD4,
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[DA9052_ADC_IN5] = DA9052_ADC_MAN_MUXSEL_AD5,
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[DA9052_ADC_IN6] = DA9052_ADC_MAN_MUXSEL_AD6,
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[DA9052_ADC_VBBAT] = DA9052_ADC_MAN_MUXSEL_VBBAT
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};
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int da9052_adc_manual_read(struct da9052 *da9052, unsigned char channel)
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{
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int ret;
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unsigned short calc_data;
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unsigned short data;
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unsigned char mux_sel;
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if (channel > DA9052_ADC_VBBAT)
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return -EINVAL;
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mutex_lock(&da9052->auxadc_lock);
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/* Channel gets activated on enabling the Conversion bit */
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mux_sel = chan_mux[channel] | DA9052_ADC_MAN_MAN_CONV;
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ret = da9052_reg_write(da9052, DA9052_ADC_MAN_REG, mux_sel);
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if (ret < 0)
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goto err;
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/* Wait for an interrupt */
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if (!wait_for_completion_timeout(&da9052->done,
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msecs_to_jiffies(500))) {
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dev_err(da9052->dev,
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"timeout waiting for ADC conversion interrupt\n");
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ret = -ETIMEDOUT;
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goto err;
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}
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ret = da9052_reg_read(da9052, DA9052_ADC_RES_H_REG);
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if (ret < 0)
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goto err;
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calc_data = (unsigned short)ret;
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data = calc_data << 2;
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ret = da9052_reg_read(da9052, DA9052_ADC_RES_L_REG);
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if (ret < 0)
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goto err;
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calc_data = (unsigned short)(ret & DA9052_ADC_RES_LSB);
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data |= calc_data;
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ret = data;
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err:
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mutex_unlock(&da9052->auxadc_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(da9052_adc_manual_read);
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static irqreturn_t da9052_auxadc_irq(int irq, void *irq_data)
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{
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struct da9052 *da9052 = irq_data;
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complete(&da9052->done);
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return IRQ_HANDLED;
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}
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int da9052_adc_read_temp(struct da9052 *da9052)
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{
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int tbat;
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tbat = da9052_reg_read(da9052, DA9052_TBAT_RES_REG);
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if (tbat <= 0)
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return tbat;
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/* ARRAY_SIZE check is not needed since TBAT is a 8-bit register */
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return tbat_lookup[tbat - 1];
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}
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EXPORT_SYMBOL_GPL(da9052_adc_read_temp);
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static struct resource da9052_rtc_resource = {
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.name = "ALM",
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.start = DA9052_IRQ_ALARM,
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@ -646,6 +775,9 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
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struct irq_desc *desc;
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int ret;
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mutex_init(&da9052->auxadc_lock);
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init_completion(&da9052->done);
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if (pdata && pdata->init != NULL)
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pdata->init(da9052);
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@ -666,6 +798,12 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
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desc = irq_to_desc(da9052->chip_irq);
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da9052->irq_base = regmap_irq_chip_get_base(desc->action->dev_id);
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ret = request_threaded_irq(DA9052_IRQ_ADC_EOM, NULL, da9052_auxadc_irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"adc irq", da9052);
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if (ret != 0)
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dev_err(da9052->dev, "DA9052 ADC IRQ failed ret=%d\n", ret);
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ret = mfd_add_devices(da9052->dev, -1, da9052_subdev_info,
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ARRAY_SIZE(da9052_subdev_info), NULL, 0);
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if (ret)
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@ -674,6 +812,7 @@ int __devinit da9052_device_init(struct da9052 *da9052, u8 chip_id)
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return 0;
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err:
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free_irq(DA9052_IRQ_ADC_EOM, da9052);
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mfd_remove_devices(da9052->dev);
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regmap_err:
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return ret;
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@ -681,6 +820,7 @@ regmap_err:
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void da9052_device_exit(struct da9052 *da9052)
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{
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free_irq(DA9052_IRQ_ADC_EOM, da9052);
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regmap_del_irq_chip(da9052->chip_irq,
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irq_get_irq_data(da9052->irq_base)->chip_data);
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mfd_remove_devices(da9052->dev);
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@ -33,6 +33,18 @@
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#include <linux/mfd/da9052/reg.h>
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/* Common - HWMON Channel Definations */
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#define DA9052_ADC_VDDOUT 0
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#define DA9052_ADC_ICH 1
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#define DA9052_ADC_TBAT 2
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#define DA9052_ADC_VBAT 3
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#define DA9052_ADC_IN4 4
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#define DA9052_ADC_IN5 5
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#define DA9052_ADC_IN6 6
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#define DA9052_ADC_TSI 7
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#define DA9052_ADC_TJUNC 8
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#define DA9052_ADC_VBBAT 9
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#define DA9052_IRQ_DCIN 0
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#define DA9052_IRQ_VBUS 1
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#define DA9052_IRQ_DCINREM 2
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@ -79,12 +91,19 @@ struct da9052 {
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struct device *dev;
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struct regmap *regmap;
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struct mutex auxadc_lock;
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struct completion done;
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int irq_base;
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u8 chip_id;
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int chip_irq;
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};
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/* ADC API */
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int da9052_adc_manual_read(struct da9052 *da9052, unsigned char channel);
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int da9052_adc_read_temp(struct da9052 *da9052);
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/* Device I/O API */
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static inline int da9052_reg_read(struct da9052 *da9052, unsigned char reg)
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{
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