> This is a driver for an A/D converter, which belongs into > drivers/iio/adc. like! please find some comments below; not all might relate to the iio conversion I plan to test this on a beagleboard-xm I always needed the following setup to make the twl4030_madc work for me /* TWL4030 CATKIT_ANA_CTRL Register */ #define TWL4030_CARKIT_ANA_CTRL 0xBB #define SEL_MADC_MCPC (1 << 3) /* * set SEL_MADC_MCPC in CARKIT_ANA_CTRL * makes ADCIN3 to ADCIN6 available to the MADC */ twl_i2c_read_u8(TWL4030_MODULE_USB, &pin_mux, TWL4030_CARKIT_ANA_CTRL); pin_mux |= SEL_MADC_MCPC; twl_i2c_write_u8(TWL4030_MODULE_USB, pin_mux, TWL4030_CARKIT_ANA_CTRL); regards, p. > Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx> > --- > drivers/iio/adc/Kconfig | 10 + > drivers/iio/adc/Makefile | 1 + > drivers/iio/adc/twl4030-madc.c | 914 +++++++++++++++++++++++++++++++++++++++++ > drivers/mfd/Kconfig | 10 - > drivers/mfd/Makefile | 1 - > drivers/mfd/twl4030-madc.c | 914 ----------------------------------------- > 6 files changed, 925 insertions(+), 925 deletions(-) > create mode 100644 drivers/iio/adc/twl4030-madc.c > delete mode 100644 drivers/mfd/twl4030-madc.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index 2209f28..427f75c 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -183,6 +183,16 @@ config TI_AM335X_ADC > Say yes here to build support for Texas Instruments ADC > driver which is also a MFD client. > > +config TWL4030_MADC > + tristate "TWL4030 MADC (Monitoring A/D Converter)" > + depends on TWL4030_CORE > + help > + This driver provides support for Triton TWL4030-MADC. The > + driver supports both RT and SW conversion methods. > + > + This driver can also be built as a module. If so, the module will be > + called twl4030-madc. > + > config TWL6030_GPADC > tristate "TWL6030 GPADC (General Purpose A/D Converter) Support" > depends on TWL4030_CORE > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > index ba9a10a..9acf2df 100644 > --- a/drivers/iio/adc/Makefile > +++ b/drivers/iio/adc/Makefile > @@ -20,5 +20,6 @@ obj-$(CONFIG_MCP3422) += mcp3422.o > obj-$(CONFIG_NAU7802) += nau7802.o > obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o > obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o > +obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o > obj-$(CONFIG_TWL6030_GPADC) += twl6030-gpadc.o > obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o > diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c > new file mode 100644 > index 0000000..0bc79a7 > --- /dev/null > +++ b/drivers/iio/adc/twl4030-madc.c > @@ -0,0 +1,914 @@ > +/* > + * > + * TWL4030 MADC module driver-This driver monitors the real time > + * conversion of analog signals like battery temperature, > + * battery type, battery level etc. > + * > + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ > + * J Keerthy <j-keerthy@xxxxxx> > + * > + * Based on twl4030-madc.c > + * Copyright (C) 2008 Nokia Corporation > + * Mikko Ylinen <mikko.k.ylinen@xxxxxxxxx> > + * > + * Amit Kucheria <amit.kucheria@xxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License > + * version 2 as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA > + * 02110-1301 USA > + * > + */ > + > +#include <linux/init.h> > +#include <linux/device.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/delay.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > +#include <linux/i2c/twl.h> > +#include <linux/i2c/twl4030-madc.h> > +#include <linux/module.h> > +#include <linux/stddef.h> > +#include <linux/mutex.h> > +#include <linux/bitops.h> > +#include <linux/jiffies.h> > +#include <linux/types.h> > +#include <linux/gfp.h> > +#include <linux/err.h> > + > +#include <linux/iio/iio.h> > + > +/* this could/should be kerneldoc, hecen /** > + * struct twl4030_madc_data - a container for madc info > + * @dev - pointer to device structure for madc > + * @lock - mutex protecting this data structure > + * @requests - Array of request struct corresponding to SW1, SW2 and RT > + * @imr - Interrupt mask register of MADC > + * @isr - Interrupt status register of MADC > + */ > +struct twl4030_madc_data { > + struct device *dev; > + struct mutex lock; /* mutex protecting this data structure */ > + struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS]; > + bool use_second_irq; > + u8 imr; > + u8 isr; > +}; > + > +static int twl4030_madc_read(struct iio_dev *iio_dev, > + const struct iio_chan_spec *chan, > + int *val, int *val2, long mask) > +{ > + struct twl4030_madc_data *madc = iio_priv(iio_dev); > + struct twl4030_madc_request req; > + int channel = chan->channel; > + int ret; > + > + req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1; > + > + req.channels = BIT(channel); > + req.active = 0; > + req.func_cb = NULL; > + req.raw = !(mask & IIO_CHAN_INFO_PROCESSED); > + req.do_avg = !!(mask & IIO_CHAN_INFO_AVERAGE_RAW); > + > + ret = twl4030_madc_conversion(&req); > + if (ret < 0) > + return ret; > + > + *val = req.rbuf[channel]; > + > + return IIO_VAL_INT; > +} > + > +static const struct iio_info twl4030_madc_iio_info = { > + .read_raw = &twl4030_madc_read, > + .driver_module = THIS_MODULE, > +}; > + > +#define TWL4030_ADC_CHANNEL(_channel, _type, _name, _mask) { \ > + .type = _type, \ > + .channel = _channel, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > + BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \ > + _mask, \ > + .datasheet_name = _name, \ > + .indexed = 1, \ > +} > + > +static const struct iio_chan_spec twl4030_madc_iio_channels[] = { > + TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0", 0), > + TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1", > + BIT(IIO_CHAN_INFO_PROCESSED)), > + TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2", 0), > + TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3", 0), > + TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4", 0), > + TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5", 0), > + TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6", 0), > + TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7", 0), > + TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8", 0), > + TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9", 0), > + TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10", > + BIT(IIO_CHAN_INFO_PROCESSED)), > + TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11", 0), > + TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12", 0), > + TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13", 0), > + TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14", 0), > + TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15", 0), > +}; > + > +static struct twl4030_madc_data *twl4030_madc; > + > +struct twl4030_prescale_divider_ratios { > + s16 numerator; > + s16 denominator; > +}; > + > +static const struct twl4030_prescale_divider_ratios > +twl4030_divider_ratios[16] = { > + {1, 1}, /* CHANNEL 0 No Prescaler */ > + {1, 1}, /* CHANNEL 1 No Prescaler */ > + {6, 10}, /* CHANNEL 2 */ > + {6, 10}, /* CHANNEL 3 */ > + {6, 10}, /* CHANNEL 4 */ > + {6, 10}, /* CHANNEL 5 */ > + {6, 10}, /* CHANNEL 6 */ > + {6, 10}, /* CHANNEL 7 */ > + {3, 14}, /* CHANNEL 8 */ > + {1, 3}, /* CHANNEL 9 */ > + {1, 1}, /* CHANNEL 10 No Prescaler */ > + {15, 100}, /* CHANNEL 11 */ > + {1, 4}, /* CHANNEL 12 */ > + {1, 1}, /* CHANNEL 13 Reserved channels */ > + {1, 1}, /* CHANNEL 14 Reseved channels */ > + {5, 11}, /* CHANNEL 15 */ > +}; > + > + > +/* > + * Conversion table from -3 to 55 degree Celcius > + */ could use a single-line comment > +static int therm_tbl[] = { no twl4030_ prefix here > +30800, 29500, 28300, 27100, > +26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900, > +17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100, > +11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310, > +8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830, > +5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170, > +4040, 3910, 3790, 3670, 3550 some indentation would be nice > +}; > + > +/* > + * Structure containing the registers > + * of different conversion methods supported by MADC. > + * Hardware or RT real time conversion request initiated by external host > + * processor for RT Signal conversions. > + * External host processors can also request for non RT conversions > + * SW1 and SW2 software conversions also called asynchronous or GPC request. > + */ > +static > +const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = { > + [TWL4030_MADC_RT] = { > + .sel = TWL4030_MADC_RTSELECT_LSB, > + .avg = TWL4030_MADC_RTAVERAGE_LSB, > + .rbase = TWL4030_MADC_RTCH0_LSB, > + }, > + [TWL4030_MADC_SW1] = { > + .sel = TWL4030_MADC_SW1SELECT_LSB, > + .avg = TWL4030_MADC_SW1AVERAGE_LSB, > + .rbase = TWL4030_MADC_GPCH0_LSB, > + .ctrl = TWL4030_MADC_CTRL_SW1, > + }, > + [TWL4030_MADC_SW2] = { > + .sel = TWL4030_MADC_SW2SELECT_LSB, > + .avg = TWL4030_MADC_SW2AVERAGE_LSB, > + .rbase = TWL4030_MADC_GPCH0_LSB, > + .ctrl = TWL4030_MADC_CTRL_SW2, > + }, > +}; > + > +/* /** > + * Function to read a particular channel value. > + * @madc - pointer to struct twl4030_madc_data > + * @reg - lsb of ADC Channel > + * If the i2c read fails it returns an error else returns 0. > + */ > +static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg) > +{ > + u8 msb, lsb; > + int ret; > + /* > + * For each ADC channel, we have MSB and LSB register pair. MSB address > + * is always LSB address+1. reg parameter is the address of LSB register > + */ > + ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &msb, reg + 1); > + if (ret) { > + dev_err(madc->dev, "unable to read MSB register 0x%X\n", > + reg + 1); > + return ret; > + } > + ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg); > + if (ret) { > + dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg); > + return ret; > + } could this be a word/u16 read? I haven't checked if there is autoincrement support... > + > + return (int)(((msb << 8) | lsb) >> 6); > +} > + > +/* > + * Return battery temperature stating the unit should nice > + * Or < 0 on failure. > + */ > +static int twl4030battery_temperature(int raw_volt) > +{ > + u8 val; > + int temp, curr, volt, res, ret; > + > + volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R; > + /* Getting and calculating the supply current in micro ampers */ amperes > + ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, > + REG_BCICTL2); > + if (ret < 0) > + return ret; > + > + curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10; > + /* Getting and calculating the thermistor resistance in ohms */ > + res = volt * 1000 / curr; > + /* calculating temperature */ > + for (temp = 58; temp >= 0; temp--) { > + int actual = therm_tbl[temp]; > + if ((actual - res) >= 0) > + break; > + } > + > + return temp + 1; > +} > + > +static int twl4030battery_current(int raw_volt) > +{ > + int ret; > + u8 val; > + > + ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, > + TWL4030_BCI_BCICTL1); > + if (ret) > + return ret; > + if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */ > + return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1; > + else /* slope of 0.88 mV/mA */ > + return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2; > +} > + > +/* > + * Function to read channel values > + * @madc - pointer to twl4030_madc_data struct > + * @reg_base - Base address of the first channel > + * @Channels - 16 bit bitmap. If the bit is set, channel value is read channels > + * @buf - The channel values are stored here. if read fails error > + * @raw - Return raw values without conversion > + * value is stored > + * Returns the number of successfully read channels. > + */ > +static int twl4030_madc_read_channels(struct twl4030_madc_data *madc, > + u8 reg_base, unsigned > + long channels, int *buf, > + bool raw) > +{ > + int count = 0, i; > + > + for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) { > + buf[i] = twl4030_madc_channel_raw_read(madc, reg_base + 2 * i); > + if (buf[i] < 0) { > + dev_err(madc->dev, "Unable to read register 0x%X\n", > + reg_base + 2 * i); > + return buf[i]; > + } > + if (raw) { > + count++; > + continue; > + } > + switch (i) { > + case 10: > + buf[i] = twl4030battery_current(buf[i]); > + if (buf[i] < 0) { > + dev_err(madc->dev, "err reading current\n"); > + return buf[i]; > + } else { > + count++; > + buf[i] = buf[i] - 750; > + } > + break; > + case 1: > + buf[i] = twl4030battery_temperature(buf[i]); > + if (buf[i] < 0) { > + dev_err(madc->dev, "err reading temperature\n"); > + return buf[i]; > + } else { > + buf[i] -= 3; > + count++; > + } > + break; > + default: > + count++; > + /* Analog Input (V) = conv_result * step_size / R > + * conv_result = decimal value of 10-bit conversion > + * result > + * step size = 1.5 / (2 ^ 10 -1) > + * R = Prescaler ratio for input channels. > + * Result given in mV hence multiplied by 1000. > + */ > + buf[i] = (buf[i] * 3 * 1000 * > + twl4030_divider_ratios[i].denominator) > + / (2 * 1023 * > + twl4030_divider_ratios[i].numerator); > + } > + } > + > + return count; > +} > + > +/* > + * Enables irq. > + * @madc - pointer to twl4030_madc_data struct > + * @id - irq number to be enabled > + * can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2 > + * corresponding to RT, SW1, SW2 conversion requests. > + * If the i2c read fails it returns an error else returns 0. > + */ > +static int twl4030_madc_enable_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; > +} > + > +/* > + * 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); some space before %d > + 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); > + /* Return results to caller */ > + if (r->func_cb != NULL) { > + r->func_cb(len, r->channels, r->rbuf); > + r->func_cb = NULL; > + } > + /* 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); > + /* Return results to caller */ > + if (r->func_cb != NULL) { > + r->func_cb(len, r->channels, r->rbuf); > + r->func_cb = NULL; > + } > + /* Free request */ > + r->result_pending = 0; > + r->active = 0; > + } > + mutex_unlock(&madc->lock); > + > + return IRQ_HANDLED; > +} > + > +static int twl4030_madc_set_irq(struct twl4030_madc_data *madc, > + struct twl4030_madc_request *req) > +{ > + struct twl4030_madc_request *p; > + int ret; > + > + p = &madc->requests[req->method]; > + memcpy(p, req, sizeof(*req)); > + ret = twl4030_madc_enable_irq(madc, req->method); > + if (ret < 0) { > + dev_err(madc->dev, "enable irq failed!!\n"); > + return ret; > + } > + > + return 0; > +} > + > +/* > + * 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 > + */ > +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->avg); > + 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); > + > +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; > + 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 == 0) ? TWL4030_BCI_TYPEN : TWL4030_BCI_ITHEN; > + 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 powen on bit. power > + * 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, "platform_data not available\n"); > + return -EINVAL; > + } > + > + iio_dev = devm_iio_device_alloc(&pdev->dev, > + sizeof(struct twl4030_madc_data)); > + 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 = 16; 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 == 1) ? > + TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2; > + madc->isr = (madc->use_second_irq == 1) ? > + TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2; > + > + 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, "twl4030_madc", madc); > + if (ret) { > + dev_dbg(&pdev->dev, "could not request irq\n"); > + goto err_i2c; > + } > + twl4030_madc = madc; > + > + ret = iio_device_register(iio_dev); > + if (ret) { > + dev_dbg(&pdev->dev, "could not register iio device\n"); > + goto err_i2c; > + } > + > + return 0; > + > +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); > + > + twl4030_madc_set_current_generator(madc, 0, 0); > + twl4030_madc_set_power(madc, 0); > + > + iio_device_unregister(iio_dev); > + > + 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", > + .owner = THIS_MODULE, > + .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"); > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index 49bb445..23a8a51 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -935,16 +935,6 @@ config TWL4030_CORE > high speed USB OTG transceiver, an audio codec (on most > versions) and many other features. > > -config TWL4030_MADC > - tristate "TI TWL4030 MADC" > - depends on TWL4030_CORE > - help > - This driver provides support for triton TWL4030-MADC. The > - driver supports both RT and SW conversion methods. > - > - This driver can be built as a module. If so it will be > - named twl4030-madc > - > config TWL4030_POWER > bool "TI TWL4030 power resources" > depends on TWL4030_CORE && ARM > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index 5aea5ef..c8eb0bc 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -71,7 +71,6 @@ obj-$(CONFIG_MFD_TPS80031) += tps80031.o > obj-$(CONFIG_MENELAUS) += menelaus.o > > obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o > -obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o > obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o > obj-$(CONFIG_MFD_TWL4030_AUDIO) += twl4030-audio.o > obj-$(CONFIG_TWL6040_CORE) += twl6040.o > diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c > deleted file mode 100644 > index 0bc79a7..0000000 > --- a/drivers/mfd/twl4030-madc.c > +++ /dev/null > @@ -1,914 +0,0 @@ > -/* > - * > - * TWL4030 MADC module driver-This driver monitors the real time > - * conversion of analog signals like battery temperature, > - * battery type, battery level etc. > - * > - * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ > - * J Keerthy <j-keerthy@xxxxxx> > - * > - * Based on twl4030-madc.c > - * Copyright (C) 2008 Nokia Corporation > - * Mikko Ylinen <mikko.k.ylinen@xxxxxxxxx> > - * > - * Amit Kucheria <amit.kucheria@xxxxxxxxxxxxx> > - * > - * This program is free software; you can redistribute it and/or > - * modify it under the terms of the GNU General Public License > - * version 2 as published by the Free Software Foundation. > - * > - * This program is distributed in the hope that it will be useful, but > - * WITHOUT ANY WARRANTY; without even the implied warranty of > - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > - * General Public License for more details. > - * > - * You should have received a copy of the GNU General Public License > - * along with this program; if not, write to the Free Software > - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA > - * 02110-1301 USA > - * > - */ > - > -#include <linux/init.h> > -#include <linux/device.h> > -#include <linux/interrupt.h> > -#include <linux/kernel.h> > -#include <linux/delay.h> > -#include <linux/platform_device.h> > -#include <linux/slab.h> > -#include <linux/i2c/twl.h> > -#include <linux/i2c/twl4030-madc.h> > -#include <linux/module.h> > -#include <linux/stddef.h> > -#include <linux/mutex.h> > -#include <linux/bitops.h> > -#include <linux/jiffies.h> > -#include <linux/types.h> > -#include <linux/gfp.h> > -#include <linux/err.h> > - > -#include <linux/iio/iio.h> > - > -/* > - * struct twl4030_madc_data - a container for madc info > - * @dev - pointer to device structure for madc > - * @lock - mutex protecting this data structure > - * @requests - Array of request struct corresponding to SW1, SW2 and RT > - * @imr - Interrupt mask register of MADC > - * @isr - Interrupt status register of MADC > - */ > -struct twl4030_madc_data { > - struct device *dev; > - struct mutex lock; /* mutex protecting this data structure */ > - struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS]; > - bool use_second_irq; > - u8 imr; > - u8 isr; > -}; > - > -static int twl4030_madc_read(struct iio_dev *iio_dev, > - const struct iio_chan_spec *chan, > - int *val, int *val2, long mask) > -{ > - struct twl4030_madc_data *madc = iio_priv(iio_dev); > - struct twl4030_madc_request req; > - int channel = chan->channel; > - int ret; > - > - req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1; > - > - req.channels = BIT(channel); > - req.active = 0; > - req.func_cb = NULL; > - req.raw = !(mask & IIO_CHAN_INFO_PROCESSED); > - req.do_avg = !!(mask & IIO_CHAN_INFO_AVERAGE_RAW); > - > - ret = twl4030_madc_conversion(&req); > - if (ret < 0) > - return ret; > - > - *val = req.rbuf[channel]; > - > - return IIO_VAL_INT; > -} > - > -static const struct iio_info twl4030_madc_iio_info = { > - .read_raw = &twl4030_madc_read, > - .driver_module = THIS_MODULE, > -}; > - > -#define TWL4030_ADC_CHANNEL(_channel, _type, _name, _mask) { \ > - .type = _type, \ > - .channel = _channel, \ > - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ > - BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \ > - _mask, \ > - .datasheet_name = _name, \ > - .indexed = 1, \ > -} > - > -static const struct iio_chan_spec twl4030_madc_iio_channels[] = { > - TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0", 0), > - TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1", > - BIT(IIO_CHAN_INFO_PROCESSED)), > - TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2", 0), > - TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3", 0), > - TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4", 0), > - TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5", 0), > - TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6", 0), > - TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7", 0), > - TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8", 0), > - TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9", 0), > - TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10", > - BIT(IIO_CHAN_INFO_PROCESSED)), > - TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11", 0), > - TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12", 0), > - TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13", 0), > - TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14", 0), > - TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15", 0), > -}; > - > -static struct twl4030_madc_data *twl4030_madc; > - > -struct twl4030_prescale_divider_ratios { > - s16 numerator; > - s16 denominator; > -}; > - > -static const struct twl4030_prescale_divider_ratios > -twl4030_divider_ratios[16] = { > - {1, 1}, /* CHANNEL 0 No Prescaler */ > - {1, 1}, /* CHANNEL 1 No Prescaler */ > - {6, 10}, /* CHANNEL 2 */ > - {6, 10}, /* CHANNEL 3 */ > - {6, 10}, /* CHANNEL 4 */ > - {6, 10}, /* CHANNEL 5 */ > - {6, 10}, /* CHANNEL 6 */ > - {6, 10}, /* CHANNEL 7 */ > - {3, 14}, /* CHANNEL 8 */ > - {1, 3}, /* CHANNEL 9 */ > - {1, 1}, /* CHANNEL 10 No Prescaler */ > - {15, 100}, /* CHANNEL 11 */ > - {1, 4}, /* CHANNEL 12 */ > - {1, 1}, /* CHANNEL 13 Reserved channels */ > - {1, 1}, /* CHANNEL 14 Reseved channels */ > - {5, 11}, /* CHANNEL 15 */ > -}; > - > - > -/* > - * Conversion table from -3 to 55 degree Celcius > - */ > -static int therm_tbl[] = { > -30800, 29500, 28300, 27100, > -26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900, > -17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100, > -11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310, > -8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830, > -5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170, > -4040, 3910, 3790, 3670, 3550 > -}; > - > -/* > - * Structure containing the registers > - * of different conversion methods supported by MADC. > - * Hardware or RT real time conversion request initiated by external host > - * processor for RT Signal conversions. > - * External host processors can also request for non RT conversions > - * SW1 and SW2 software conversions also called asynchronous or GPC request. > - */ > -static > -const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = { > - [TWL4030_MADC_RT] = { > - .sel = TWL4030_MADC_RTSELECT_LSB, > - .avg = TWL4030_MADC_RTAVERAGE_LSB, > - .rbase = TWL4030_MADC_RTCH0_LSB, > - }, > - [TWL4030_MADC_SW1] = { > - .sel = TWL4030_MADC_SW1SELECT_LSB, > - .avg = TWL4030_MADC_SW1AVERAGE_LSB, > - .rbase = TWL4030_MADC_GPCH0_LSB, > - .ctrl = TWL4030_MADC_CTRL_SW1, > - }, > - [TWL4030_MADC_SW2] = { > - .sel = TWL4030_MADC_SW2SELECT_LSB, > - .avg = TWL4030_MADC_SW2AVERAGE_LSB, > - .rbase = TWL4030_MADC_GPCH0_LSB, > - .ctrl = TWL4030_MADC_CTRL_SW2, > - }, > -}; > - > -/* > - * Function to read a particular channel value. > - * @madc - pointer to struct twl4030_madc_data > - * @reg - lsb of ADC Channel > - * If the i2c read fails it returns an error else returns 0. > - */ > -static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg) > -{ > - u8 msb, lsb; > - int ret; > - /* > - * For each ADC channel, we have MSB and LSB register pair. MSB address > - * is always LSB address+1. reg parameter is the address of LSB register > - */ > - ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &msb, reg + 1); > - if (ret) { > - dev_err(madc->dev, "unable to read MSB register 0x%X\n", > - reg + 1); > - return ret; > - } > - ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg); > - if (ret) { > - dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg); > - return ret; > - } > - > - return (int)(((msb << 8) | lsb) >> 6); > -} > - > -/* > - * Return battery temperature > - * Or < 0 on failure. > - */ > -static int twl4030battery_temperature(int raw_volt) > -{ > - u8 val; > - int temp, curr, volt, res, ret; > - > - volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R; > - /* Getting and calculating the supply current in micro ampers */ > - ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, > - REG_BCICTL2); > - if (ret < 0) > - return ret; > - > - curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10; > - /* Getting and calculating the thermistor resistance in ohms */ > - res = volt * 1000 / curr; > - /* calculating temperature */ > - for (temp = 58; temp >= 0; temp--) { > - int actual = therm_tbl[temp]; > - if ((actual - res) >= 0) > - break; > - } > - > - return temp + 1; > -} > - > -static int twl4030battery_current(int raw_volt) > -{ > - int ret; > - u8 val; > - > - ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, > - TWL4030_BCI_BCICTL1); > - if (ret) > - return ret; > - if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */ > - return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1; > - else /* slope of 0.88 mV/mA */ > - return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2; > -} > - > -/* > - * Function to read channel values > - * @madc - pointer to twl4030_madc_data struct > - * @reg_base - Base address of the first channel > - * @Channels - 16 bit bitmap. If the bit is set, channel value is read > - * @buf - The channel values are stored here. if read fails error > - * @raw - Return raw values without conversion > - * value is stored > - * Returns the number of successfully read channels. > - */ > -static int twl4030_madc_read_channels(struct twl4030_madc_data *madc, > - u8 reg_base, unsigned > - long channels, int *buf, > - bool raw) > -{ > - int count = 0, i; > - > - for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) { > - buf[i] = twl4030_madc_channel_raw_read(madc, reg_base + 2 * i); > - if (buf[i] < 0) { > - dev_err(madc->dev, "Unable to read register 0x%X\n", > - reg_base + 2 * i); > - return buf[i]; > - } > - if (raw) { > - count++; > - continue; > - } > - switch (i) { > - case 10: > - buf[i] = twl4030battery_current(buf[i]); > - if (buf[i] < 0) { > - dev_err(madc->dev, "err reading current\n"); > - return buf[i]; > - } else { > - count++; > - buf[i] = buf[i] - 750; > - } > - break; > - case 1: > - buf[i] = twl4030battery_temperature(buf[i]); > - if (buf[i] < 0) { > - dev_err(madc->dev, "err reading temperature\n"); > - return buf[i]; > - } else { > - buf[i] -= 3; > - count++; > - } > - break; > - default: > - count++; > - /* Analog Input (V) = conv_result * step_size / R > - * conv_result = decimal value of 10-bit conversion > - * result > - * step size = 1.5 / (2 ^ 10 -1) > - * R = Prescaler ratio for input channels. > - * Result given in mV hence multiplied by 1000. > - */ > - buf[i] = (buf[i] * 3 * 1000 * > - twl4030_divider_ratios[i].denominator) > - / (2 * 1023 * > - twl4030_divider_ratios[i].numerator); > - } > - } > - > - return count; > -} > - > -/* > - * Enables irq. > - * @madc - pointer to twl4030_madc_data struct > - * @id - irq number to be enabled > - * can take one of TWL4030_MADC_RT, TWL4030_MADC_SW1, TWL4030_MADC_SW2 > - * corresponding to RT, SW1, SW2 conversion requests. > - * If the i2c read fails it returns an error else returns 0. > - */ > -static int twl4030_madc_enable_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; > -} > - > -/* > - * 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); > - /* Return results to caller */ > - if (r->func_cb != NULL) { > - r->func_cb(len, r->channels, r->rbuf); > - r->func_cb = NULL; > - } > - /* 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); > - /* Return results to caller */ > - if (r->func_cb != NULL) { > - r->func_cb(len, r->channels, r->rbuf); > - r->func_cb = NULL; > - } > - /* Free request */ > - r->result_pending = 0; > - r->active = 0; > - } > - mutex_unlock(&madc->lock); > - > - return IRQ_HANDLED; > -} > - > -static int twl4030_madc_set_irq(struct twl4030_madc_data *madc, > - struct twl4030_madc_request *req) > -{ > - struct twl4030_madc_request *p; > - int ret; > - > - p = &madc->requests[req->method]; > - memcpy(p, req, sizeof(*req)); > - ret = twl4030_madc_enable_irq(madc, req->method); > - if (ret < 0) { > - dev_err(madc->dev, "enable irq failed!!\n"); > - return ret; > - } > - > - return 0; > -} > - > -/* > - * 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 > - */ > -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->avg); > - 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); > - > -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; > - 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 == 0) ? TWL4030_BCI_TYPEN : TWL4030_BCI_ITHEN; > - 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 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); > - 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, "platform_data not available\n"); > - return -EINVAL; > - } > - > - iio_dev = devm_iio_device_alloc(&pdev->dev, > - sizeof(struct twl4030_madc_data)); > - 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 = 16; > - > - /* > - * 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 == 1) ? > - TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2; > - madc->isr = (madc->use_second_irq == 1) ? > - TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2; > - > - 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, "twl4030_madc", madc); > - if (ret) { > - dev_dbg(&pdev->dev, "could not request irq\n"); > - goto err_i2c; > - } > - twl4030_madc = madc; > - > - ret = iio_device_register(iio_dev); > - if (ret) { > - dev_dbg(&pdev->dev, "could not register iio device\n"); > - goto err_i2c; > - } > - > - return 0; > - > -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); > - > - twl4030_madc_set_current_generator(madc, 0, 0); > - twl4030_madc_set_power(madc, 0); > - > - iio_device_unregister(iio_dev); > - > - 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", > - .owner = THIS_MODULE, > - .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"); > -- Peter Meerwald +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
