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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
We want the staging/iio fixes in here as well to handle merge issues. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
954 lines
26 KiB
C
954 lines
26 KiB
C
/*
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*
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* TWL4030 MADC module driver-This driver monitors the real time
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* conversion of analog signals like battery temperature,
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* battery type, battery level etc.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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* J Keerthy <j-keerthy@ti.com>
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*
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* Based on twl4030-madc.c
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* Copyright (C) 2008 Nokia Corporation
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* Mikko Ylinen <mikko.k.ylinen@nokia.com>
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*
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* Amit Kucheria <amit.kucheria@canonical.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/mfd/twl.h>
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#include <linux/module.h>
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#include <linux/stddef.h>
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#include <linux/mutex.h>
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#include <linux/bitops.h>
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#include <linux/jiffies.h>
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#include <linux/types.h>
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#include <linux/gfp.h>
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#include <linux/err.h>
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#define TWL4030_MADC_MAX_CHANNELS 16
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#define TWL4030_MADC_CTRL1 0x00
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#define TWL4030_MADC_CTRL2 0x01
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#define TWL4030_MADC_RTSELECT_LSB 0x02
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#define TWL4030_MADC_SW1SELECT_LSB 0x06
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#define TWL4030_MADC_SW2SELECT_LSB 0x0A
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#define TWL4030_MADC_RTAVERAGE_LSB 0x04
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#define TWL4030_MADC_SW1AVERAGE_LSB 0x08
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#define TWL4030_MADC_SW2AVERAGE_LSB 0x0C
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#define TWL4030_MADC_CTRL_SW1 0x12
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#define TWL4030_MADC_CTRL_SW2 0x13
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#define TWL4030_MADC_RTCH0_LSB 0x17
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#define TWL4030_MADC_GPCH0_LSB 0x37
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#define TWL4030_MADC_MADCON (1 << 0) /* MADC power on */
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#define TWL4030_MADC_BUSY (1 << 0) /* MADC busy */
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/* MADC conversion completion */
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#define TWL4030_MADC_EOC_SW (1 << 1)
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/* MADC SWx start conversion */
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#define TWL4030_MADC_SW_START (1 << 5)
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#define TWL4030_MADC_ADCIN0 (1 << 0)
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#define TWL4030_MADC_ADCIN1 (1 << 1)
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#define TWL4030_MADC_ADCIN2 (1 << 2)
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#define TWL4030_MADC_ADCIN3 (1 << 3)
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#define TWL4030_MADC_ADCIN4 (1 << 4)
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#define TWL4030_MADC_ADCIN5 (1 << 5)
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#define TWL4030_MADC_ADCIN6 (1 << 6)
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#define TWL4030_MADC_ADCIN7 (1 << 7)
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#define TWL4030_MADC_ADCIN8 (1 << 8)
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#define TWL4030_MADC_ADCIN9 (1 << 9)
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#define TWL4030_MADC_ADCIN10 (1 << 10)
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#define TWL4030_MADC_ADCIN11 (1 << 11)
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#define TWL4030_MADC_ADCIN12 (1 << 12)
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#define TWL4030_MADC_ADCIN13 (1 << 13)
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#define TWL4030_MADC_ADCIN14 (1 << 14)
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#define TWL4030_MADC_ADCIN15 (1 << 15)
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/* Fixed channels */
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#define TWL4030_MADC_BTEMP TWL4030_MADC_ADCIN1
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#define TWL4030_MADC_VBUS TWL4030_MADC_ADCIN8
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#define TWL4030_MADC_VBKB TWL4030_MADC_ADCIN9
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#define TWL4030_MADC_ICHG TWL4030_MADC_ADCIN10
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#define TWL4030_MADC_VCHG TWL4030_MADC_ADCIN11
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#define TWL4030_MADC_VBAT TWL4030_MADC_ADCIN12
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/* Step size and prescaler ratio */
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#define TEMP_STEP_SIZE 147
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#define TEMP_PSR_R 100
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#define CURR_STEP_SIZE 147
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#define CURR_PSR_R1 44
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#define CURR_PSR_R2 88
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#define TWL4030_BCI_BCICTL1 0x23
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#define TWL4030_BCI_CGAIN 0x020
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#define TWL4030_BCI_MESBAT (1 << 1)
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#define TWL4030_BCI_TYPEN (1 << 4)
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#define TWL4030_BCI_ITHEN (1 << 3)
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#define REG_BCICTL2 0x024
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#define TWL4030_BCI_ITHSENS 0x007
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/* Register and bits for GPBR1 register */
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#define TWL4030_REG_GPBR1 0x0c
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#define TWL4030_GPBR1_MADC_HFCLK_EN (1 << 7)
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#define TWL4030_USB_SEL_MADC_MCPC (1<<3)
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#define TWL4030_USB_CARKIT_ANA_CTRL 0xBB
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struct twl4030_madc_conversion_method {
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u8 sel;
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u8 avg;
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u8 rbase;
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u8 ctrl;
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};
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/**
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* struct twl4030_madc_request - madc request packet for channel conversion
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* @channels: 16 bit bitmap for individual channels
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* @do_avg: sample the input channel for 4 consecutive cycles
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* @method: RT, SW1, SW2
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* @type: Polling or interrupt based method
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* @active: Flag if request is active
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* @result_pending: Flag from irq handler, that result is ready
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* @raw: Return raw value, do not convert it
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* @rbuf: Result buffer
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*/
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struct twl4030_madc_request {
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unsigned long channels;
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bool do_avg;
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u16 method;
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u16 type;
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bool active;
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bool result_pending;
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bool raw;
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int rbuf[TWL4030_MADC_MAX_CHANNELS];
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};
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enum conversion_methods {
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TWL4030_MADC_RT,
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TWL4030_MADC_SW1,
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TWL4030_MADC_SW2,
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TWL4030_MADC_NUM_METHODS
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};
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enum sample_type {
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TWL4030_MADC_WAIT,
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TWL4030_MADC_IRQ_ONESHOT,
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TWL4030_MADC_IRQ_REARM
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};
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/**
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* struct twl4030_madc_data - a container for madc info
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* @dev: Pointer to device structure for madc
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* @lock: Mutex protecting this data structure
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* @regulator: Pointer to bias regulator for madc
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* @requests: Array of request struct corresponding to SW1, SW2 and RT
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* @use_second_irq: IRQ selection (main or co-processor)
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* @imr: Interrupt mask register of MADC
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* @isr: Interrupt status register of MADC
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*/
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struct twl4030_madc_data {
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struct device *dev;
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struct mutex lock; /* mutex protecting this data structure */
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struct regulator *usb3v1;
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struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
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bool use_second_irq;
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u8 imr;
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u8 isr;
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};
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static int twl4030_madc_conversion(struct twl4030_madc_request *req);
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static int twl4030_madc_read(struct iio_dev *iio_dev,
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const struct iio_chan_spec *chan,
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int *val, int *val2, long mask)
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{
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struct twl4030_madc_data *madc = iio_priv(iio_dev);
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struct twl4030_madc_request req;
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int ret;
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req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;
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req.channels = BIT(chan->channel);
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req.active = false;
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req.type = TWL4030_MADC_WAIT;
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req.raw = !(mask == IIO_CHAN_INFO_PROCESSED);
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req.do_avg = (mask == IIO_CHAN_INFO_AVERAGE_RAW);
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ret = twl4030_madc_conversion(&req);
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if (ret < 0)
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return ret;
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*val = req.rbuf[chan->channel];
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return IIO_VAL_INT;
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}
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static const struct iio_info twl4030_madc_iio_info = {
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.read_raw = &twl4030_madc_read,
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};
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#define TWL4030_ADC_CHANNEL(_channel, _type, _name) { \
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.type = _type, \
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.channel = _channel, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
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BIT(IIO_CHAN_INFO_PROCESSED), \
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.datasheet_name = _name, \
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.indexed = 1, \
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}
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static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
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TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0"),
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TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1"),
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TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2"),
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TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3"),
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TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4"),
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TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5"),
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TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6"),
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TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7"),
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TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8"),
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TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9"),
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TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10"),
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TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11"),
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TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12"),
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TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13"),
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TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14"),
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TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15"),
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};
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static struct twl4030_madc_data *twl4030_madc;
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struct twl4030_prescale_divider_ratios {
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s16 numerator;
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s16 denominator;
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};
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static const struct twl4030_prescale_divider_ratios
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twl4030_divider_ratios[16] = {
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{1, 1}, /* CHANNEL 0 No Prescaler */
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{1, 1}, /* CHANNEL 1 No Prescaler */
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{6, 10}, /* CHANNEL 2 */
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{6, 10}, /* CHANNEL 3 */
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{6, 10}, /* CHANNEL 4 */
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{6, 10}, /* CHANNEL 5 */
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{6, 10}, /* CHANNEL 6 */
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{6, 10}, /* CHANNEL 7 */
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{3, 14}, /* CHANNEL 8 */
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{1, 3}, /* CHANNEL 9 */
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{1, 1}, /* CHANNEL 10 No Prescaler */
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{15, 100}, /* CHANNEL 11 */
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{1, 4}, /* CHANNEL 12 */
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{1, 1}, /* CHANNEL 13 Reserved channels */
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{1, 1}, /* CHANNEL 14 Reseved channels */
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{5, 11}, /* CHANNEL 15 */
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};
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/* Conversion table from -3 to 55 degrees Celcius */
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static int twl4030_therm_tbl[] = {
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30800, 29500, 28300, 27100,
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26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700,
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17900, 17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100,
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12600, 12100, 11600, 11200, 10800, 10400, 10000, 9630, 9280,
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8950, 8620, 8310, 8020, 7730, 7460, 7200, 6950, 6710,
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6470, 6250, 6040, 5830, 5640, 5450, 5260, 5090, 4920,
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4760, 4600, 4450, 4310, 4170, 4040, 3910, 3790, 3670,
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3550
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};
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/*
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* Structure containing the registers
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* of different conversion methods supported by MADC.
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* Hardware or RT real time conversion request initiated by external host
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* processor for RT Signal conversions.
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* External host processors can also request for non RT conversions
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* SW1 and SW2 software conversions also called asynchronous or GPC request.
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*/
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static
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const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
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[TWL4030_MADC_RT] = {
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.sel = TWL4030_MADC_RTSELECT_LSB,
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.avg = TWL4030_MADC_RTAVERAGE_LSB,
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.rbase = TWL4030_MADC_RTCH0_LSB,
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},
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[TWL4030_MADC_SW1] = {
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.sel = TWL4030_MADC_SW1SELECT_LSB,
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.avg = TWL4030_MADC_SW1AVERAGE_LSB,
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.rbase = TWL4030_MADC_GPCH0_LSB,
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.ctrl = TWL4030_MADC_CTRL_SW1,
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},
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[TWL4030_MADC_SW2] = {
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.sel = TWL4030_MADC_SW2SELECT_LSB,
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.avg = TWL4030_MADC_SW2AVERAGE_LSB,
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.rbase = TWL4030_MADC_GPCH0_LSB,
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.ctrl = TWL4030_MADC_CTRL_SW2,
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},
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};
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/**
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* twl4030_madc_channel_raw_read() - Function to read a particular channel value
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* @madc: pointer to struct twl4030_madc_data
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* @reg: lsb of ADC Channel
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*
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* Return: 0 on success, an error code otherwise.
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*/
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static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
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{
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u16 val;
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int ret;
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/*
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* For each ADC channel, we have MSB and LSB register pair. MSB address
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* is always LSB address+1. reg parameter is the address of LSB register
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*/
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ret = twl_i2c_read_u16(TWL4030_MODULE_MADC, &val, reg);
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if (ret) {
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dev_err(madc->dev, "unable to read register 0x%X\n", reg);
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return ret;
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}
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return (int)(val >> 6);
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}
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/*
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* Return battery temperature in degrees Celsius
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* Or < 0 on failure.
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*/
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static int twl4030battery_temperature(int raw_volt)
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{
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u8 val;
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int temp, curr, volt, res, ret;
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volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
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/* Getting and calculating the supply current in micro amperes */
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ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
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REG_BCICTL2);
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if (ret < 0)
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return ret;
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curr = ((val & TWL4030_BCI_ITHSENS) + 1) * 10;
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/* Getting and calculating the thermistor resistance in ohms */
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res = volt * 1000 / curr;
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/* calculating temperature */
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for (temp = 58; temp >= 0; temp--) {
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int actual = twl4030_therm_tbl[temp];
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if ((actual - res) >= 0)
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break;
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}
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return temp + 1;
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}
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static int twl4030battery_current(int raw_volt)
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{
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int ret;
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u8 val;
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ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
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TWL4030_BCI_BCICTL1);
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if (ret)
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return ret;
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if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
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return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
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else /* slope of 0.88 mV/mA */
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return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
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}
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/*
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* Function to read channel values
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* @madc - pointer to twl4030_madc_data struct
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* @reg_base - Base address of the first channel
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* @Channels - 16 bit bitmap. If the bit is set, channel's value is read
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* @buf - The channel values are stored here. if read fails error
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* @raw - Return raw values without conversion
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* value is stored
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* Returns the number of successfully read channels.
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*/
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static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
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u8 reg_base, unsigned
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long channels, int *buf,
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bool raw)
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{
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int count = 0;
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int i;
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u8 reg;
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for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
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reg = reg_base + (2 * i);
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buf[i] = twl4030_madc_channel_raw_read(madc, reg);
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if (buf[i] < 0) {
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dev_err(madc->dev, "Unable to read register 0x%X\n",
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reg);
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return buf[i];
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}
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if (raw) {
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count++;
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continue;
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}
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switch (i) {
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case 10:
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buf[i] = twl4030battery_current(buf[i]);
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if (buf[i] < 0) {
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dev_err(madc->dev, "err reading current\n");
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return buf[i];
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} else {
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count++;
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buf[i] = buf[i] - 750;
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}
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break;
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case 1:
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buf[i] = twl4030battery_temperature(buf[i]);
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if (buf[i] < 0) {
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dev_err(madc->dev, "err reading temperature\n");
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return buf[i];
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} else {
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buf[i] -= 3;
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count++;
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}
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break;
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default:
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count++;
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/* Analog Input (V) = conv_result * step_size / R
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* conv_result = decimal value of 10-bit conversion
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* result
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* step size = 1.5 / (2 ^ 10 -1)
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* R = Prescaler ratio for input channels.
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* 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, ®, 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,
|
|
®val, 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,
|
|
®val, 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,
|
|
®val, 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, ®val, 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, ®val,
|
|
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");
|