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![Jingoo Han](/assets/img/avatar_default.png)
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
818 lines
22 KiB
C
818 lines
22 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/init.h>
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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/i2c/twl.h>
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#include <linux/i2c/twl4030-madc.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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/*
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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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* @requests - Array of request struct corresponding to SW1, SW2 and RT
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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 twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
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int imr;
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int isr;
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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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/*
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* Conversion table from -3 to 55 degree Celcius
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*/
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static int therm_tbl[] = {
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30800, 29500, 28300, 27100,
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26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900,
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17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100,
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11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310,
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8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830,
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5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170,
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4040, 3910, 3790, 3670, 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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* 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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* If the i2c read fails it returns an error else returns 0.
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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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u8 msb, lsb;
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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_u8(TWL4030_MODULE_MADC, &msb, reg + 1);
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if (ret) {
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dev_err(madc->dev, "unable to read MSB register 0x%X\n",
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reg + 1);
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return ret;
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}
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ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg);
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if (ret) {
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dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg);
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return ret;
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}
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return (int)(((msb << 8) | lsb) >> 6);
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}
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/*
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* Return battery temperature
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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 ampers */
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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_ITHEN) + 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 = 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 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, count_req = 0, 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,
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"Unable to read register 0x%X\n", reg);
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count_req++;
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continue;
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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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count_req++;
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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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count_req++;
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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.
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*/
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buf[i] = (buf[i] * 3 * 1000 *
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twl4030_divider_ratios[i].denominator)
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/ (2 * 1023 *
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twl4030_divider_ratios[i].numerator);
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}
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}
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if (count_req)
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dev_err(madc->dev, "%d channel conversion failed\n", count_req);
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return count;
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}
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/*
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* Enables irq.
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* @madc - pointer to twl4030_madc_data struct
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* @id - irq number to be enabled
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* can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
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* corresponding to RT, SW1, SW2 conversion requests.
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* If the i2c read fails it returns an error else returns 0.
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*/
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static int twl4030_madc_enable_irq(struct twl4030_madc_data *madc, u8 id)
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{
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u8 val;
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int ret;
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ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
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if (ret) {
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dev_err(madc->dev, "unable to read imr register 0x%X\n",
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madc->imr);
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return ret;
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}
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val &= ~(1 << id);
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ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
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if (ret) {
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dev_err(madc->dev,
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"unable to write imr register 0x%X\n", madc->imr);
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return ret;
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}
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return 0;
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}
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/*
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* Disables irq.
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* @madc - pointer to twl4030_madc_data struct
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* @id - irq number to be disabled
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* can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2
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* corresponding to RT, SW1, SW2 conversion requests.
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* Returns error if i2c read/write fails.
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*/
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static int twl4030_madc_disable_irq(struct twl4030_madc_data *madc, u8 id)
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{
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u8 val;
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int ret;
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ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &val, madc->imr);
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if (ret) {
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dev_err(madc->dev, "unable to read imr register 0x%X\n",
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madc->imr);
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return ret;
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}
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val |= (1 << id);
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ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, val, madc->imr);
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if (ret) {
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dev_err(madc->dev,
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"unable to write imr register 0x%X\n", madc->imr);
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return ret;
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}
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return 0;
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}
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static irqreturn_t twl4030_madc_threaded_irq_handler(int irq, void *_madc)
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{
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struct twl4030_madc_data *madc = _madc;
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const struct twl4030_madc_conversion_method *method;
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u8 isr_val, imr_val;
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int i, len, ret;
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struct twl4030_madc_request *r;
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mutex_lock(&madc->lock);
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ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &isr_val, madc->isr);
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if (ret) {
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dev_err(madc->dev, "unable to read isr register 0x%X\n",
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madc->isr);
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goto err_i2c;
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}
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ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &imr_val, madc->imr);
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if (ret) {
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dev_err(madc->dev, "unable to read imr register 0x%X\n",
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madc->imr);
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goto err_i2c;
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}
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isr_val &= ~imr_val;
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for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
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if (!(isr_val & (1 << i)))
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continue;
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ret = twl4030_madc_disable_irq(madc, i);
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if (ret < 0)
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dev_dbg(madc->dev, "Disable interrupt failed%d\n", i);
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madc->requests[i].result_pending = 1;
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}
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for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
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r = &madc->requests[i];
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/* No pending results for this method, move to next one */
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if (!r->result_pending)
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continue;
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method = &twl4030_conversion_methods[r->method];
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/* Read results */
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len = twl4030_madc_read_channels(madc, method->rbase,
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r->channels, r->rbuf, r->raw);
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/* Return results to caller */
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if (r->func_cb != NULL) {
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r->func_cb(len, r->channels, r->rbuf);
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r->func_cb = NULL;
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}
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/* Free request */
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r->result_pending = 0;
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r->active = 0;
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}
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mutex_unlock(&madc->lock);
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return IRQ_HANDLED;
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err_i2c:
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/*
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* In case of error check whichever request is active
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* and service the same.
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*/
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for (i = 0; i < TWL4030_MADC_NUM_METHODS; i++) {
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r = &madc->requests[i];
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if (r->active == 0)
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continue;
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method = &twl4030_conversion_methods[r->method];
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/* Read results */
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len = twl4030_madc_read_channels(madc, method->rbase,
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r->channels, r->rbuf, r->raw);
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/* Return results to caller */
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if (r->func_cb != NULL) {
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r->func_cb(len, r->channels, r->rbuf);
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r->func_cb = NULL;
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}
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/* Free request */
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r->result_pending = 0;
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r->active = 0;
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}
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mutex_unlock(&madc->lock);
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return IRQ_HANDLED;
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}
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static int twl4030_madc_set_irq(struct twl4030_madc_data *madc,
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struct twl4030_madc_request *req)
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{
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struct twl4030_madc_request *p;
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int ret;
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p = &madc->requests[req->method];
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memcpy(p, req, sizeof(*req));
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ret = twl4030_madc_enable_irq(madc, req->method);
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if (ret < 0) {
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dev_err(madc->dev, "enable irq failed!!\n");
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return ret;
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}
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return 0;
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}
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/*
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* Function which enables the madc conversion
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* by writing to the control register.
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* @madc - pointer to twl4030_madc_data struct
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* @conv_method - can be TWL4030_MADC_RT, TWL4030_MADC_SW2, TWL4030_MADC_SW1
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* corresponding to RT SW1 or SW2 conversion methods.
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* Returns 0 if succeeds else a negative error value
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*/
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static int twl4030_madc_start_conversion(struct twl4030_madc_data *madc,
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int conv_method)
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{
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const struct twl4030_madc_conversion_method *method;
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int ret = 0;
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method = &twl4030_conversion_methods[conv_method];
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switch (conv_method) {
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case TWL4030_MADC_SW1:
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case TWL4030_MADC_SW2:
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ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
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TWL4030_MADC_SW_START, method->ctrl);
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if (ret) {
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dev_err(madc->dev,
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"unable to write ctrl register 0x%X\n",
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method->ctrl);
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return ret;
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}
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break;
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default:
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break;
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}
|
|
|
|
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
|
|
*/
|
|
int twl4030_madc_conversion(struct twl4030_madc_request *req)
|
|
{
|
|
const struct twl4030_madc_conversion_method *method;
|
|
u8 ch_msb, ch_lsb;
|
|
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;
|
|
}
|
|
ch_msb = (req->channels >> 8) & 0xff;
|
|
ch_lsb = req->channels & 0xff;
|
|
method = &twl4030_conversion_methods[req->method];
|
|
/* Select channels to be converted */
|
|
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_msb, method->sel + 1);
|
|
if (ret) {
|
|
dev_err(twl4030_madc->dev,
|
|
"unable to write sel register 0x%X\n", method->sel + 1);
|
|
goto out;
|
|
}
|
|
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_lsb, method->sel);
|
|
if (ret) {
|
|
dev_err(twl4030_madc->dev,
|
|
"unable to write sel register 0x%X\n", method->sel + 1);
|
|
goto out;
|
|
}
|
|
/* Select averaging for all channels if do_avg is set */
|
|
if (req->do_avg) {
|
|
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
|
|
ch_msb, method->avg + 1);
|
|
if (ret) {
|
|
dev_err(twl4030_madc->dev,
|
|
"unable to write avg register 0x%X\n",
|
|
method->avg + 1);
|
|
goto out;
|
|
}
|
|
ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
|
|
ch_lsb, method->avg);
|
|
if (ret) {
|
|
dev_err(twl4030_madc->dev,
|
|
"unable to write sel reg 0x%X\n",
|
|
method->sel + 1);
|
|
goto out;
|
|
}
|
|
}
|
|
if (req->type == TWL4030_MADC_IRQ_ONESHOT && req->func_cb != NULL) {
|
|
ret = twl4030_madc_set_irq(twl4030_madc, req);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = twl4030_madc_start_conversion(twl4030_madc, req->method);
|
|
if (ret < 0)
|
|
goto out;
|
|
twl4030_madc->requests[req->method].active = 1;
|
|
ret = 0;
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(twl4030_madc_conversion);
|
|
|
|
/*
|
|
* Return channel value
|
|
* Or < 0 on failure.
|
|
*/
|
|
int twl4030_get_madc_conversion(int channel_no)
|
|
{
|
|
struct twl4030_madc_request req;
|
|
int temp = 0;
|
|
int ret;
|
|
|
|
req.channels = (1 << channel_no);
|
|
req.method = TWL4030_MADC_SW2;
|
|
req.active = 0;
|
|
req.func_cb = NULL;
|
|
ret = twl4030_madc_conversion(&req);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (req.rbuf[channel_no] > 0)
|
|
temp = req.rbuf[channel_no];
|
|
|
|
return temp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(twl4030_get_madc_conversion);
|
|
|
|
/*
|
|
* Function to enable or disable bias current for
|
|
* main battery type reading or temperature sensing
|
|
* @madc - pointer to twl4030_madc_data struct
|
|
* @chan - can be one of the two values
|
|
* TWL4030_BCI_ITHEN - Enables bias current for main battery type reading
|
|
* TWL4030_BCI_TYPEN - Enables bias current for main battery temperature
|
|
* sensing
|
|
* @on - enable or disable chan.
|
|
*/
|
|
static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
|
|
int chan, int on)
|
|
{
|
|
int ret;
|
|
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;
|
|
}
|
|
if (on)
|
|
regval |= chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
|
|
else
|
|
regval &= chan ? ~TWL4030_BCI_ITHEN : ~TWL4030_BCI_TYPEN;
|
|
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 powen 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);
|
|
int ret;
|
|
u8 regval;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "platform_data not available\n");
|
|
return -EINVAL;
|
|
}
|
|
madc = kzalloc(sizeof(*madc), GFP_KERNEL);
|
|
if (!madc)
|
|
return -ENOMEM;
|
|
|
|
madc->dev = &pdev->dev;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
madc->imr = (pdata->irq_line == 1) ?
|
|
TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
|
|
madc->isr = (pdata->irq_line == 1) ?
|
|
TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2;
|
|
ret = twl4030_madc_set_power(madc, 1);
|
|
if (ret < 0)
|
|
goto err_power;
|
|
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, madc);
|
|
mutex_init(&madc->lock);
|
|
ret = request_threaded_irq(platform_get_irq(pdev, 0), NULL,
|
|
twl4030_madc_threaded_irq_handler,
|
|
IRQF_TRIGGER_RISING, "twl4030_madc", madc);
|
|
if (ret) {
|
|
dev_dbg(&pdev->dev, "could not request irq\n");
|
|
goto err_i2c;
|
|
}
|
|
twl4030_madc = madc;
|
|
return 0;
|
|
err_i2c:
|
|
twl4030_madc_set_current_generator(madc, 0, 0);
|
|
err_current_generator:
|
|
twl4030_madc_set_power(madc, 0);
|
|
err_power:
|
|
kfree(madc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int twl4030_madc_remove(struct platform_device *pdev)
|
|
{
|
|
struct twl4030_madc_data *madc = platform_get_drvdata(pdev);
|
|
|
|
free_irq(platform_get_irq(pdev, 0), madc);
|
|
twl4030_madc_set_current_generator(madc, 0, 0);
|
|
twl4030_madc_set_power(madc, 0);
|
|
kfree(madc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver twl4030_madc_driver = {
|
|
.probe = twl4030_madc_probe,
|
|
.remove = twl4030_madc_remove,
|
|
.driver = {
|
|
.name = "twl4030_madc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(twl4030_madc_driver);
|
|
|
|
MODULE_DESCRIPTION("TWL4030 ADC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("J Keerthy");
|
|
MODULE_ALIAS("platform:twl4030_madc");
|