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alistair23-linux/drivers/iio/adc/twl4030-madc.c
Thomas Gleixner 2b27bdcc20 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 336 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation inc 51 franklin st fifth floor boston ma 02110
  1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 246 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:07 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* TWL4030 MADC module driver-This driver monitors the real time
* conversion of analog signals like battery temperature,
* battery type, battery level etc.
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
* J Keerthy <j-keerthy@ti.com>
*
* Based on twl4030-madc.c
* Copyright (C) 2008 Nokia Corporation
* Mikko Ylinen <mikko.k.ylinen@nokia.com>
*
* Amit Kucheria <amit.kucheria@canonical.com>
*/
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mfd/twl.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/mutex.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>
#include <linux/types.h>
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#define TWL4030_MADC_MAX_CHANNELS 16
#define TWL4030_MADC_CTRL1 0x00
#define TWL4030_MADC_CTRL2 0x01
#define TWL4030_MADC_RTSELECT_LSB 0x02
#define TWL4030_MADC_SW1SELECT_LSB 0x06
#define TWL4030_MADC_SW2SELECT_LSB 0x0A
#define TWL4030_MADC_RTAVERAGE_LSB 0x04
#define TWL4030_MADC_SW1AVERAGE_LSB 0x08
#define TWL4030_MADC_SW2AVERAGE_LSB 0x0C
#define TWL4030_MADC_CTRL_SW1 0x12
#define TWL4030_MADC_CTRL_SW2 0x13
#define TWL4030_MADC_RTCH0_LSB 0x17
#define TWL4030_MADC_GPCH0_LSB 0x37
#define TWL4030_MADC_MADCON (1 << 0) /* MADC power on */
#define TWL4030_MADC_BUSY (1 << 0) /* MADC busy */
/* MADC conversion completion */
#define TWL4030_MADC_EOC_SW (1 << 1)
/* MADC SWx start conversion */
#define TWL4030_MADC_SW_START (1 << 5)
#define TWL4030_MADC_ADCIN0 (1 << 0)
#define TWL4030_MADC_ADCIN1 (1 << 1)
#define TWL4030_MADC_ADCIN2 (1 << 2)
#define TWL4030_MADC_ADCIN3 (1 << 3)
#define TWL4030_MADC_ADCIN4 (1 << 4)
#define TWL4030_MADC_ADCIN5 (1 << 5)
#define TWL4030_MADC_ADCIN6 (1 << 6)
#define TWL4030_MADC_ADCIN7 (1 << 7)
#define TWL4030_MADC_ADCIN8 (1 << 8)
#define TWL4030_MADC_ADCIN9 (1 << 9)
#define TWL4030_MADC_ADCIN10 (1 << 10)
#define TWL4030_MADC_ADCIN11 (1 << 11)
#define TWL4030_MADC_ADCIN12 (1 << 12)
#define TWL4030_MADC_ADCIN13 (1 << 13)
#define TWL4030_MADC_ADCIN14 (1 << 14)
#define TWL4030_MADC_ADCIN15 (1 << 15)
/* Fixed channels */
#define TWL4030_MADC_BTEMP TWL4030_MADC_ADCIN1
#define TWL4030_MADC_VBUS TWL4030_MADC_ADCIN8
#define TWL4030_MADC_VBKB TWL4030_MADC_ADCIN9
#define TWL4030_MADC_ICHG TWL4030_MADC_ADCIN10
#define TWL4030_MADC_VCHG TWL4030_MADC_ADCIN11
#define TWL4030_MADC_VBAT TWL4030_MADC_ADCIN12
/* Step size and prescaler ratio */
#define TEMP_STEP_SIZE 147
#define TEMP_PSR_R 100
#define CURR_STEP_SIZE 147
#define CURR_PSR_R1 44
#define CURR_PSR_R2 88
#define TWL4030_BCI_BCICTL1 0x23
#define TWL4030_BCI_CGAIN 0x020
#define TWL4030_BCI_MESBAT (1 << 1)
#define TWL4030_BCI_TYPEN (1 << 4)
#define TWL4030_BCI_ITHEN (1 << 3)
#define REG_BCICTL2 0x024
#define TWL4030_BCI_ITHSENS 0x007
/* Register and bits for GPBR1 register */
#define TWL4030_REG_GPBR1 0x0c
#define TWL4030_GPBR1_MADC_HFCLK_EN (1 << 7)
#define TWL4030_USB_SEL_MADC_MCPC (1<<3)
#define TWL4030_USB_CARKIT_ANA_CTRL 0xBB
struct twl4030_madc_conversion_method {
u8 sel;
u8 avg;
u8 rbase;
u8 ctrl;
};
/**
* struct twl4030_madc_request - madc request packet for channel conversion
* @channels: 16 bit bitmap for individual channels
* @do_avg: sample the input channel for 4 consecutive cycles
* @method: RT, SW1, SW2
* @type: Polling or interrupt based method
* @active: Flag if request is active
* @result_pending: Flag from irq handler, that result is ready
* @raw: Return raw value, do not convert it
* @rbuf: Result buffer
*/
struct twl4030_madc_request {
unsigned long channels;
bool do_avg;
u16 method;
u16 type;
bool active;
bool result_pending;
bool raw;
int rbuf[TWL4030_MADC_MAX_CHANNELS];
};
enum conversion_methods {
TWL4030_MADC_RT,
TWL4030_MADC_SW1,
TWL4030_MADC_SW2,
TWL4030_MADC_NUM_METHODS
};
enum sample_type {
TWL4030_MADC_WAIT,
TWL4030_MADC_IRQ_ONESHOT,
TWL4030_MADC_IRQ_REARM
};
/**
* struct twl4030_madc_data - a container for madc info
* @dev: Pointer to device structure for madc
* @lock: Mutex protecting this data structure
* @regulator: Pointer to bias regulator for madc
* @requests: Array of request struct corresponding to SW1, SW2 and RT
* @use_second_irq: IRQ selection (main or co-processor)
* @imr: Interrupt mask register of MADC
* @isr: Interrupt status register of MADC
*/
struct twl4030_madc_data {
struct device *dev;
struct mutex lock; /* mutex protecting this data structure */
struct regulator *usb3v1;
struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
bool use_second_irq;
u8 imr;
u8 isr;
};
static int twl4030_madc_conversion(struct twl4030_madc_request *req);
static int twl4030_madc_read(struct iio_dev *iio_dev,
const struct iio_chan_spec *chan,
int *val, int *val2, long mask)
{
struct twl4030_madc_data *madc = iio_priv(iio_dev);
struct twl4030_madc_request req;
int ret;
req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;
req.channels = BIT(chan->channel);
req.active = false;
req.type = TWL4030_MADC_WAIT;
req.raw = !(mask == IIO_CHAN_INFO_PROCESSED);
req.do_avg = (mask == IIO_CHAN_INFO_AVERAGE_RAW);
ret = twl4030_madc_conversion(&req);
if (ret < 0)
return ret;
*val = req.rbuf[chan->channel];
return IIO_VAL_INT;
}
static const struct iio_info twl4030_madc_iio_info = {
.read_raw = &twl4030_madc_read,
};
#define TWL4030_ADC_CHANNEL(_channel, _type, _name) { \
.type = _type, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
BIT(IIO_CHAN_INFO_PROCESSED), \
.datasheet_name = _name, \
.indexed = 1, \
}
static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0"),
TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1"),
TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2"),
TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3"),
TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4"),
TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5"),
TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6"),
TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7"),
TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8"),
TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9"),
TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10"),
TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11"),
TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12"),
TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13"),
TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14"),
TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15"),
};
static struct twl4030_madc_data *twl4030_madc;
struct twl4030_prescale_divider_ratios {
s16 numerator;
s16 denominator;
};
static const struct twl4030_prescale_divider_ratios
twl4030_divider_ratios[16] = {
{1, 1}, /* CHANNEL 0 No Prescaler */
{1, 1}, /* CHANNEL 1 No Prescaler */
{6, 10}, /* CHANNEL 2 */
{6, 10}, /* CHANNEL 3 */
{6, 10}, /* CHANNEL 4 */
{6, 10}, /* CHANNEL 5 */
{6, 10}, /* CHANNEL 6 */
{6, 10}, /* CHANNEL 7 */
{3, 14}, /* CHANNEL 8 */
{1, 3}, /* CHANNEL 9 */
{1, 1}, /* CHANNEL 10 No Prescaler */
{15, 100}, /* CHANNEL 11 */
{1, 4}, /* CHANNEL 12 */
{1, 1}, /* CHANNEL 13 Reserved channels */
{1, 1}, /* CHANNEL 14 Reseved channels */
{5, 11}, /* CHANNEL 15 */
};
/* Conversion table from -3 to 55 degrees Celcius */
static int twl4030_therm_tbl[] = {
30800, 29500, 28300, 27100,
26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700,
17900, 17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100,
12600, 12100, 11600, 11200, 10800, 10400, 10000, 9630, 9280,
8950, 8620, 8310, 8020, 7730, 7460, 7200, 6950, 6710,
6470, 6250, 6040, 5830, 5640, 5450, 5260, 5090, 4920,
4760, 4600, 4450, 4310, 4170, 4040, 3910, 3790, 3670,
3550
};
/*
* Structure containing the registers
* of different conversion methods supported by MADC.
* Hardware or RT real time conversion request initiated by external host
* processor for RT Signal conversions.
* External host processors can also request for non RT conversions
* SW1 and SW2 software conversions also called asynchronous or GPC request.
*/
static
const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
[TWL4030_MADC_RT] = {
.sel = TWL4030_MADC_RTSELECT_LSB,
.avg = TWL4030_MADC_RTAVERAGE_LSB,
.rbase = TWL4030_MADC_RTCH0_LSB,
},
[TWL4030_MADC_SW1] = {
.sel = TWL4030_MADC_SW1SELECT_LSB,
.avg = TWL4030_MADC_SW1AVERAGE_LSB,
.rbase = TWL4030_MADC_GPCH0_LSB,
.ctrl = TWL4030_MADC_CTRL_SW1,
},
[TWL4030_MADC_SW2] = {
.sel = TWL4030_MADC_SW2SELECT_LSB,
.avg = TWL4030_MADC_SW2AVERAGE_LSB,
.rbase = TWL4030_MADC_GPCH0_LSB,
.ctrl = TWL4030_MADC_CTRL_SW2,
},
};
/**
* twl4030_madc_channel_raw_read() - Function to read a particular channel value
* @madc: pointer to struct twl4030_madc_data
* @reg: lsb of ADC Channel
*
* Return: 0 on success, an error code otherwise.
*/
static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
{
u16 val;
int ret;
/*
* For each ADC channel, we have MSB and LSB register pair. MSB address
* is always LSB address+1. reg parameter is the address of LSB register
*/
ret = twl_i2c_read_u16(TWL4030_MODULE_MADC, &val, reg);
if (ret) {
dev_err(madc->dev, "unable to read register 0x%X\n", reg);
return ret;
}
return (int)(val >> 6);
}
/*
* Return battery temperature in degrees Celsius
* Or < 0 on failure.
*/
static int twl4030battery_temperature(int raw_volt)
{
u8 val;
int temp, curr, volt, res, ret;
volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
/* Getting and calculating the supply current in micro amperes */
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
REG_BCICTL2);
if (ret < 0)
return ret;
curr = ((val & TWL4030_BCI_ITHSENS) + 1) * 10;
/* Getting and calculating the thermistor resistance in ohms */
res = volt * 1000 / curr;
/* calculating temperature */
for (temp = 58; temp >= 0; temp--) {
int actual = twl4030_therm_tbl[temp];
if ((actual - res) >= 0)
break;
}
return temp + 1;
}
static int twl4030battery_current(int raw_volt)
{
int ret;
u8 val;
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
TWL4030_BCI_BCICTL1);
if (ret)
return ret;
if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
else /* slope of 0.88 mV/mA */
return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
}
/*
* Function to read channel values
* @madc - pointer to twl4030_madc_data struct
* @reg_base - Base address of the first channel
* @Channels - 16 bit bitmap. If the bit is set, channel's value is read
* @buf - The channel values are stored here. if read fails error
* @raw - Return raw values without conversion
* value is stored
* Returns the number of successfully read channels.
*/
static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
u8 reg_base, unsigned
long channels, int *buf,
bool raw)
{
int count = 0;
int i;
u8 reg;
for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
reg = reg_base + (2 * i);
buf[i] = twl4030_madc_channel_raw_read(madc, reg);
if (buf[i] < 0) {
dev_err(madc->dev, "Unable to read register 0x%X\n",
reg);
return buf[i];
}
if (raw) {
count++;
continue;
}
switch (i) {
case 10:
buf[i] = twl4030battery_current(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading current\n");
return buf[i];
} else {
count++;
buf[i] = buf[i] - 750;
}
break;
case 1:
buf[i] = twl4030battery_temperature(buf[i]);
if (buf[i] < 0) {
dev_err(madc->dev, "err reading temperature\n");
return buf[i];
} else {
buf[i] -= 3;
count++;
}
break;
default:
count++;
/* Analog Input (V) = conv_result * step_size / R
* conv_result = decimal value of 10-bit conversion
* result
* step size = 1.5 / (2 ^ 10 -1)
* R = Prescaler ratio for input channels.
* Result given in mV hence multiplied by 1000.
*/
buf[i] = (buf[i] * 3 * 1000 *
twl4030_divider_ratios[i].denominator)
/ (2 * 1023 *
twl4030_divider_ratios[i].numerator);
}
}
return count;
}
/*
* Disables irq.
* @madc - pointer to twl4030_madc_data struct
* @id - irq number to be disabled
* can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
* corresponding to RT, SW1, SW2 conversion requests.
* Returns error if i2c read/write fails.
*/
static int twl4030_madc_disable_irq(struct twl4030_madc_data *madc, u8 id)
{
u8 val;
int ret;
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
if (ret) {
dev_err(madc->dev, "unable to read imr register 0x%X\n",
madc->imr);
return ret;
}
val |= (1 << id);
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
if (ret) {
dev_err(madc->dev,
"unable to write imr register 0x%X\n", madc->imr);
return ret;
}
return 0;
}
static irqreturn_t twl4030_madc_threaded_irq_handler(int irq, void *_madc)
{
struct twl4030_madc_data *madc = _madc;
const struct twl4030_madc_conversion_method *method;
u8 isr_val, imr_val;
int i, len, ret;
struct twl4030_madc_request *r;
mutex_lock(&madc->lock);
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &isr_val, madc->isr);
if (ret) {
dev_err(madc->dev, "unable to read isr register 0x%X\n",
madc->isr);
goto err_i2c;
}
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &imr_val, madc->imr);
if (ret) {
dev_err(madc->dev, "unable to read imr register 0x%X\n",
madc->imr);
goto err_i2c;
}
isr_val &= ~imr_val;
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
if (!(isr_val & (1 << i)))
continue;
ret = twl4030_madc_disable_irq(madc, i);
if (ret < 0)
dev_dbg(madc->dev, "Disable interrupt failed %d\n", i);
madc->requests[i].result_pending = 1;
}
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
r = &madc->requests[i];
/* No pending results for this method, move to next one */
if (!r->result_pending)
continue;
method = &twl4030_conversion_methods[r->method];
/* Read results */
len = twl4030_madc_read_channels(madc, method->rbase,
r->channels, r->rbuf, r->raw);
/* Free request */
r->result_pending = 0;
r->active = 0;
}
mutex_unlock(&madc->lock);
return IRQ_HANDLED;
err_i2c:
/*
* In case of error check whichever request is active
* and service the same.
*/
for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
r = &madc->requests[i];
if (r->active == 0)
continue;
method = &twl4030_conversion_methods[r->method];
/* Read results */
len = twl4030_madc_read_channels(madc, method->rbase,
r->channels, r->rbuf, r->raw);
/* Free request */
r->result_pending = 0;
r->active = 0;
}
mutex_unlock(&madc->lock);
return IRQ_HANDLED;
}
/*
* Function which enables the madc conversion
* by writing to the control register.
* @madc - pointer to twl4030_madc_data struct
* @conv_method - can be TWL4030_MADC_RT, TWL4030_MADC_SW2, TWL4030_MADC_SW1
* corresponding to RT SW1 or SW2 conversion methods.
* Returns 0 if succeeds else a negative error value
*/
static int twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
int conv_method)
{
const struct twl4030_madc_conversion_method *method;
int ret = 0;
if (conv_method != TWL4030_MADC_SW1 && conv_method != TWL4030_MADC_SW2)
return -ENOTSUPP;
method = &twl4030_conversion_methods[conv_method];
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, TWL4030_MADC_SW_START,
method->ctrl);
if (ret) {
dev_err(madc->dev, "unable to write ctrl register 0x%X\n",
method->ctrl);
return ret;
}
return 0;
}
/*
* Function that waits for conversion to be ready
* @madc - pointer to twl4030_madc_data struct
* @timeout_ms - timeout value in milliseconds
* @status_reg - ctrl register
* returns 0 if succeeds else a negative error value
*/
static int twl4030_madc_wait_conversion_ready(struct twl4030_madc_data *madc,
unsigned int timeout_ms,
u8 status_reg)
{
unsigned long timeout;
int ret;
timeout = jiffies + msecs_to_jiffies(timeout_ms);
do {
u8 reg;
ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &reg, status_reg);
if (ret) {
dev_err(madc->dev,
"unable to read status register 0x%X\n",
status_reg);
return ret;
}
if (!(reg & TWL4030_MADC_BUSY) && (reg & TWL4030_MADC_EOC_SW))
return 0;
usleep_range(500, 2000);
} while (!time_after(jiffies, timeout));
dev_err(madc->dev, "conversion timeout!\n");
return -EAGAIN;
}
/*
* An exported function which can be called from other kernel drivers.
* @req twl4030_madc_request structure
* req->rbuf will be filled with read values of channels based on the
* channel index. If a particular channel reading fails there will
* be a negative error value in the corresponding array element.
* returns 0 if succeeds else error value
*/
static int twl4030_madc_conversion(struct twl4030_madc_request *req)
{
const struct twl4030_madc_conversion_method *method;
int ret;
if (!req || !twl4030_madc)
return -EINVAL;
mutex_lock(&twl4030_madc->lock);
if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
ret = -EINVAL;
goto out;
}
/* Do we have a conversion request ongoing */
if (twl4030_madc->requests[req->method].active) {
ret = -EBUSY;
goto out;
}
method = &twl4030_conversion_methods[req->method];
/* Select channels to be converted */
ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels, method->sel);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write sel register 0x%X\n", method->sel);
goto out;
}
/* Select averaging for all channels if do_avg is set */
if (req->do_avg) {
ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels,
method->avg);
if (ret) {
dev_err(twl4030_madc->dev,
"unable to write avg register 0x%X\n",
method->avg);
goto out;
}
}
/* With RT method we should not be here anymore */
if (req->method == TWL4030_MADC_RT) {
ret = -EINVAL;
goto out;
}
ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
if (ret < 0)
goto out;
twl4030_madc->requests[req->method].active = 1;
/* Wait until conversion is ready (ctrl register returns EOC) */
ret = twl4030_madc_wait_conversion_ready(twl4030_madc, 5, method->ctrl);
if (ret) {
twl4030_madc->requests[req->method].active = 0;
goto out;
}
ret = twl4030_madc_read_channels(twl4030_madc, method->rbase,
req->channels, req->rbuf, req->raw);
twl4030_madc->requests[req->method].active = 0;
out:
mutex_unlock(&twl4030_madc->lock);
return ret;
}
/**
* twl4030_madc_set_current_generator() - setup bias current
*
* @madc: pointer to twl4030_madc_data struct
* @chan: can be one of the two values:
* 0 - Enables bias current for main battery type reading
* 1 - Enables bias current for main battery temperature sensing
* @on: enable or disable chan.
*
* Function to enable or disable bias current for
* main battery type reading or temperature sensing
*/
static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
int chan, int on)
{
int ret;
int regmask;
u8 regval;
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
&regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(madc->dev, "unable to read BCICTL1 reg 0x%X",
TWL4030_BCI_BCICTL1);
return ret;
}
regmask = chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
if (on)
regval |= regmask;
else
regval &= ~regmask;
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(madc->dev, "unable to write BCICTL1 reg 0x%X\n",
TWL4030_BCI_BCICTL1);
return ret;
}
return 0;
}
/*
* Function that sets MADC software power on bit to enable MADC
* @madc - pointer to twl4030_madc_data struct
* @on - Enable or disable MADC software power on bit.
* returns error if i2c read/write fails else 0
*/
static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
{
u8 regval;
int ret;
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
&regval, TWL4030_MADC_CTRL1);
if (ret) {
dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",
TWL4030_MADC_CTRL1);
return ret;
}
if (on)
regval |= TWL4030_MADC_MADCON;
else
regval &= ~TWL4030_MADC_MADCON;
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, regval, TWL4030_MADC_CTRL1);
if (ret) {
dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",
TWL4030_MADC_CTRL1);
return ret;
}
return 0;
}
/*
* Initialize MADC and request for threaded irq
*/
static int twl4030_madc_probe(struct platform_device *pdev)
{
struct twl4030_madc_data *madc;
struct twl4030_madc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
int irq, ret;
u8 regval;
struct iio_dev *iio_dev = NULL;
if (!pdata && !np) {
dev_err(&pdev->dev, "neither platform data nor Device Tree node available\n");
return -EINVAL;
}
iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*madc));
if (!iio_dev) {
dev_err(&pdev->dev, "failed allocating iio device\n");
return -ENOMEM;
}
madc = iio_priv(iio_dev);
madc->dev = &pdev->dev;
iio_dev->name = dev_name(&pdev->dev);
iio_dev->dev.parent = &pdev->dev;
iio_dev->dev.of_node = pdev->dev.of_node;
iio_dev->info = &twl4030_madc_iio_info;
iio_dev->modes = INDIO_DIRECT_MODE;
iio_dev->channels = twl4030_madc_iio_channels;
iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);
/*
* Phoenix provides 2 interrupt lines. The first one is connected to
* the OMAP. The other one can be connected to the other processor such
* as modem. Hence two separate ISR and IMR registers.
*/
if (pdata)
madc->use_second_irq = (pdata->irq_line != 1);
else
madc->use_second_irq = of_property_read_bool(np,
"ti,system-uses-second-madc-irq");
madc->imr = madc->use_second_irq ? TWL4030_MADC_IMR2 :
TWL4030_MADC_IMR1;
madc->isr = madc->use_second_irq ? TWL4030_MADC_ISR2 :
TWL4030_MADC_ISR1;
ret = twl4030_madc_set_power(madc, 1);
if (ret < 0)
return ret;
ret = twl4030_madc_set_current_generator(madc, 0, 1);
if (ret < 0)
goto err_current_generator;
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
&regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",
TWL4030_BCI_BCICTL1);
goto err_i2c;
}
regval |= TWL4030_BCI_MESBAT;
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
regval, TWL4030_BCI_BCICTL1);
if (ret) {
dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",
TWL4030_BCI_BCICTL1);
goto err_i2c;
}
/* Check that MADC clock is on */
ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &regval, TWL4030_REG_GPBR1);
if (ret) {
dev_err(&pdev->dev, "unable to read reg GPBR1 0x%X\n",
TWL4030_REG_GPBR1);
goto err_i2c;
}
/* If MADC clk is not on, turn it on */
if (!(regval & TWL4030_GPBR1_MADC_HFCLK_EN)) {
dev_info(&pdev->dev, "clk disabled, enabling\n");
regval |= TWL4030_GPBR1_MADC_HFCLK_EN;
ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, regval,
TWL4030_REG_GPBR1);
if (ret) {
dev_err(&pdev->dev, "unable to write reg GPBR1 0x%X\n",
TWL4030_REG_GPBR1);
goto err_i2c;
}
}
platform_set_drvdata(pdev, iio_dev);
mutex_init(&madc->lock);
irq = platform_get_irq(pdev, 0);
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
twl4030_madc_threaded_irq_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"twl4030_madc", madc);
if (ret) {
dev_err(&pdev->dev, "could not request irq\n");
goto err_i2c;
}
twl4030_madc = madc;
/* Configure MADC[3:6] */
ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
TWL4030_USB_CARKIT_ANA_CTRL);
if (ret) {
dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL 0x%X\n",
TWL4030_USB_CARKIT_ANA_CTRL);
goto err_i2c;
}
regval |= TWL4030_USB_SEL_MADC_MCPC;
ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
TWL4030_USB_CARKIT_ANA_CTRL);
if (ret) {
dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
TWL4030_USB_CARKIT_ANA_CTRL);
goto err_i2c;
}
/* Enable 3v1 bias regulator for MADC[3:6] */
madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
if (IS_ERR(madc->usb3v1)) {
ret = -ENODEV;
goto err_i2c;
}
ret = regulator_enable(madc->usb3v1);
if (ret) {
dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
goto err_i2c;
}
ret = iio_device_register(iio_dev);
if (ret) {
dev_err(&pdev->dev, "could not register iio device\n");
goto err_usb3v1;
}
return 0;
err_usb3v1:
regulator_disable(madc->usb3v1);
err_i2c:
twl4030_madc_set_current_generator(madc, 0, 0);
err_current_generator:
twl4030_madc_set_power(madc, 0);
return ret;
}
static int twl4030_madc_remove(struct platform_device *pdev)
{
struct iio_dev *iio_dev = platform_get_drvdata(pdev);
struct twl4030_madc_data *madc = iio_priv(iio_dev);
iio_device_unregister(iio_dev);
twl4030_madc_set_current_generator(madc, 0, 0);
twl4030_madc_set_power(madc, 0);
regulator_disable(madc->usb3v1);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id twl_madc_of_match[] = {
{ .compatible = "ti,twl4030-madc", },
{ },
};
MODULE_DEVICE_TABLE(of, twl_madc_of_match);
#endif
static struct platform_driver twl4030_madc_driver = {
.probe = twl4030_madc_probe,
.remove = twl4030_madc_remove,
.driver = {
.name = "twl4030_madc",
.of_match_table = of_match_ptr(twl_madc_of_match),
},
};
module_platform_driver(twl4030_madc_driver);
MODULE_DESCRIPTION("TWL4030 ADC driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("J Keerthy");
MODULE_ALIAS("platform:twl4030_madc");
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