RE: [PATCH 01/02] MFD: add ADC support to DA9052/53 MFD core v3

From: Tc, Jenny
Date: Sat Mar 17 2012 - 16:58:09 EST

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In reply to: Ashish Jangam: "[PATCH 01/02] MFD: add ADC support to DA9052/53 MFD core v3"
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Hi,

> -----Original Message-----
> From: linux-kernel-owner@xxxxxxxxxxxxxxx [mailto:linux-kernel-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Ashish Jangam
> Sent: Saturday, March 17, 2012 3:34 PM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Dajun; Mark Brown; linux-watchdog@xxxxxxxxxxxxxxx; lm-sensors@lm-
> sensors.org; sameo@xxxxxxxxxxxxxxx
> Subject: [PATCH 01/02] MFD: add ADC support to DA9052/53 MFD core v3
>
> 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.
>
> This patch is functionally tested on Samsung SMDKV6410.
>
> Signed-off-by: David Dajun Chen <dchen@xxxxxxxxxxx>
> Signed-off-by: Ashish Jangam <ashish.jangam@xxxxxxxxxxxxxxx>
> ---
> Changes since v2
> - Replace wait_for_completion_timeout with wait_for_completion Changes
> since v1
> - Move global variable in to struct da9052
> - Pass da9052 pointer instead of NULL in request_threaded_irq call
> ---
> drivers/mfd/da9052-core.c | 136
> +++++++++++++++++++++++++++++++++++++
> include/linux/mfd/da9052/da9052.h | 20 ++++++
> 2 files changed, 156 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c index
> 7ff313f..bfac307 100644
> --- a/drivers/mfd/da9052-core.c
> +++ b/drivers/mfd/da9052-core.c
> @@ -318,6 +318,130 @@ 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
> +};
> +
> +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(&da9052->done);

I would prefer to have wait_for_completion_timeout here. What if interrupt is not triggered at all?

> +
> + 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;

Shouldn't be if (tbat <=0)?. Next line will fail if tbat=0.

> +
> + /* 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,
> @@ -646,6 +770,10 @@ int __devinit da9052_device_init(struct da9052
> *da9052, u8 chip_id)
> struct irq_desc *desc;
> int ret;
>
> + mutex_init(&da9052->io_lock);
> + mutex_init(&da9052->auxadc_lock);
> + init_completion(&da9052->done);
> +
> if (pdata && pdata->init != NULL)
> pdata->init(da9052);
>
> @@ -666,6 +794,12 @@ 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)
> @@ -674,6 +808,7 @@ 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;
> @@ -681,6 +816,7 @@ regmap_err:
>
> void da9052_device_exit(struct da9052 *da9052) {
> + free_irq(DA9052_IRQ_ADC_EOM, da9052);

What if request_threaded_irq is failed?

> regmap_del_irq_chip(da9052->chip_irq,
> irq_get_irq_data(da9052->irq_base)->chip_data);
> mfd_remove_devices(da9052->dev);
> diff --git a/include/linux/mfd/da9052/da9052.h
> b/include/linux/mfd/da9052/da9052.h
> index 7ffbd6e..5dd26a7 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
> @@ -76,8 +88,12 @@ enum da9052_chip_id { struct da9052_pdata;
>
> struct da9052 {
> + struct mutex io_lock;
> + struct mutex auxadc_lock;
> +
> struct device *dev;
> struct regmap *regmap;
> + struct completion done;
>
> int irq_base;
> u8 chip_id;
> @@ -85,6 +101,10 @@ 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: Peter Zijlstra: "Re: cpu_active vs pcrypt & padata"
Previous message: Rafael J. Wysocki: "Re: [PATCH]: Lower the amount of pages used for buffering on hibernation"
In reply to: Ashish Jangam: "[PATCH 01/02] MFD: add ADC support to DA9052/53 MFD core v3"
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