This is a driver for an A/D converter, which belongs into drivers/iio/adc. Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx> --- drivers/iio/adc/Kconfig | 10 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/twl4030-madc.c | 922 +++++++++++++++++++++++++++++++++++++++++ drivers/mfd/Kconfig | 10 - drivers/mfd/Makefile | 1 - drivers/mfd/twl4030-madc.c | 922 ----------------------------------------- 6 files changed, 933 insertions(+), 933 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..4da61c4 --- /dev/null +++ b/drivers/iio/adc/twl4030-madc.c @@ -0,0 +1,922 @@ +/* + * + * 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> +#include <linux/iio/machine.h> +#include <linux/iio/driver.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; + int imr; + int 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) ? false : true; + req.do_avg = (mask & IIO_CHAN_INFO_AVERAGE_RAW) ? true : false; + + 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 ADC_CHANNEL(_channel, _type, _name, _mask) { \ + .type = _type, \ + .scan_type = IIO_ST('u', 10, 16, 0), \ + .channel = _channel, \ + .info_mask_separate = _mask, \ + .datasheet_name = _name, \ + .indexed = 1, \ +} + +static const struct iio_chan_spec twl4030_madc_iio_channels[] = { + ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(1, IIO_TEMP, "ADCIN1", BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10", BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), + ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), +}; + +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, count_req = 0, i; + u8 reg; + + for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) { + reg = reg_base + 2 * i; + buf[i] = twl4030_madc_channel_raw_read(madc, reg); + if (buf[i] < 0) { + dev_err(madc->dev, + "Unable to read register 0x%X\n", reg); + count_req++; + continue; + } + 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"); + count_req++; + } 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"); + count_req++; + } 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); + } + } + if (count_req) + dev_err(madc->dev, "%d channel conversion failed\n", count_req); + + 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; + method = &twl4030_conversion_methods[conv_method]; + switch (conv_method) { + case TWL4030_MADC_SW1: + case TWL4030_MADC_SW2: + 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; + } + break; + default: + break; + } + + 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); + 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 = false; + + 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 4da61c4..0000000 --- a/drivers/mfd/twl4030-madc.c +++ /dev/null @@ -1,922 +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> -#include <linux/iio/machine.h> -#include <linux/iio/driver.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; - int imr; - int 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) ? false : true; - req.do_avg = (mask & IIO_CHAN_INFO_AVERAGE_RAW) ? true : false; - - 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 ADC_CHANNEL(_channel, _type, _name, _mask) { \ - .type = _type, \ - .scan_type = IIO_ST('u', 10, 16, 0), \ - .channel = _channel, \ - .info_mask_separate = _mask, \ - .datasheet_name = _name, \ - .indexed = 1, \ -} - -static const struct iio_chan_spec twl4030_madc_iio_channels[] = { - ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(1, IIO_TEMP, "ADCIN1", BIT(IIO_CHAN_INFO_PROCESSED) | - BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10", BIT(IIO_CHAN_INFO_PROCESSED) | - BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), - ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15", BIT(IIO_CHAN_INFO_AVERAGE_RAW)), -}; - -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, count_req = 0, i; - u8 reg; - - for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) { - reg = reg_base + 2 * i; - buf[i] = twl4030_madc_channel_raw_read(madc, reg); - if (buf[i] < 0) { - dev_err(madc->dev, - "Unable to read register 0x%X\n", reg); - count_req++; - continue; - } - 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"); - count_req++; - } 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"); - count_req++; - } 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); - } - } - if (count_req) - dev_err(madc->dev, "%d channel conversion failed\n", count_req); - - 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; - method = &twl4030_conversion_methods[conv_method]; - switch (conv_method) { - case TWL4030_MADC_SW1: - case TWL4030_MADC_SW2: - 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; - } - break; - default: - break; - } - - 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); - 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 = false; - - 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"); -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
