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
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
--- /dev/null
+/*
+ *
+ * TWL4030 MADC module driver-This driver monitors the real time
+ * conversion of analog signals like battery temperature,
+ * battery type, battery level etc.
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ * J Keerthy <j-keerthy@ti.com>
+ *
+ * Based on twl4030-madc.c
+ * Copyright (C) 2008 Nokia Corporation
+ * Mikko Ylinen <mikko.k.ylinen@nokia.com>
+ *
+ * Amit Kucheria <amit.kucheria@canonical.com>
+ *
+ * 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
+ * @use_second_irq: IRQ selection (main or co-processor)
+ * @imr: Interrupt mask register of MADC
+ * @isr: Interrupt status register of MADC
+ */
+struct twl4030_madc_data {
+ struct device *dev;
+ struct mutex lock; /* mutex protecting this data structure */
+ struct 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 ret;
+
+ req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;
+
+ req.channels = BIT(chan->channel);
+ req.active = false;
+ req.func_cb = NULL;
+ req.type = TWL4030_MADC_WAIT;
+ req.raw = !(mask == IIO_CHAN_INFO_PROCESSED);
+ req.do_avg = (mask == IIO_CHAN_INFO_AVERAGE_RAW);
+
+ ret = twl4030_madc_conversion(&req);
+ if (ret < 0)
+ return ret;
+
+ *val = req.rbuf[chan->channel];
+
+ return IIO_VAL_INT;
+}
+
+static const struct iio_info twl4030_madc_iio_info = {
+ .read_raw = &twl4030_madc_read,
+ .driver_module = THIS_MODULE,
+};
+
+#define TWL4030_ADC_CHANNEL(_channel, _type, _name) { \
+ .type = _type, \
+ .channel = _channel, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
+ BIT(IIO_CHAN_INFO_PROCESSED), \
+ .datasheet_name = _name, \
+ .indexed = 1, \
+}
+
+static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
+ TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0"),
+ TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1"),
+ TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2"),
+ TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3"),
+ TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4"),
+ TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5"),
+ TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6"),
+ TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7"),
+ TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8"),
+ TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9"),
+ TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10"),
+ TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11"),
+ TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12"),
+ TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13"),
+ TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14"),
+ TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15"),
+};
+
+static struct twl4030_madc_data *twl4030_madc;
+
+struct twl4030_prescale_divider_ratios {
+ s16 numerator;
+ s16 denominator;
+};
+
+static const struct twl4030_prescale_divider_ratios
+twl4030_divider_ratios[16] = {
+ {1, 1}, /* CHANNEL 0 No Prescaler */
+ {1, 1}, /* CHANNEL 1 No Prescaler */
+ {6, 10}, /* CHANNEL 2 */
+ {6, 10}, /* CHANNEL 3 */
+ {6, 10}, /* CHANNEL 4 */
+ {6, 10}, /* CHANNEL 5 */
+ {6, 10}, /* CHANNEL 6 */
+ {6, 10}, /* CHANNEL 7 */
+ {3, 14}, /* CHANNEL 8 */
+ {1, 3}, /* CHANNEL 9 */
+ {1, 1}, /* CHANNEL 10 No Prescaler */
+ {15, 100}, /* CHANNEL 11 */
+ {1, 4}, /* CHANNEL 12 */
+ {1, 1}, /* CHANNEL 13 Reserved channels */
+ {1, 1}, /* CHANNEL 14 Reseved channels */
+ {5, 11}, /* CHANNEL 15 */
+};
+
+
+/* Conversion table from -3 to 55 degrees Celcius */
+static int twl4030_therm_tbl[] = {
+ 30800, 29500, 28300, 27100,
+ 26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700,
+ 17900, 17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100,
+ 12600, 12100, 11600, 11200, 10800, 10400, 10000, 9630, 9280,
+ 8950, 8620, 8310, 8020, 7730, 7460, 7200, 6950, 6710,
+ 6470, 6250, 6040, 5830, 5640, 5450, 5260, 5090, 4920,
+ 4760, 4600, 4450, 4310, 4170, 4040, 3910, 3790, 3670,
+ 3550
+};
+
+/*
+ * Structure containing the registers
+ * of different conversion methods supported by MADC.
+ * Hardware or RT real time conversion request initiated by external host
+ * processor for RT Signal conversions.
+ * External host processors can also request for non RT conversions
+ * SW1 and SW2 software conversions also called asynchronous or GPC request.
+ */
+static
+const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
+ [TWL4030_MADC_RT] = {
+ .sel = TWL4030_MADC_RTSELECT_LSB,
+ .avg = TWL4030_MADC_RTAVERAGE_LSB,
+ .rbase = TWL4030_MADC_RTCH0_LSB,
+ },
+ [TWL4030_MADC_SW1] = {
+ .sel = TWL4030_MADC_SW1SELECT_LSB,
+ .avg = TWL4030_MADC_SW1AVERAGE_LSB,
+ .rbase = TWL4030_MADC_GPCH0_LSB,
+ .ctrl = TWL4030_MADC_CTRL_SW1,
+ },
+ [TWL4030_MADC_SW2] = {
+ .sel = TWL4030_MADC_SW2SELECT_LSB,
+ .avg = TWL4030_MADC_SW2AVERAGE_LSB,
+ .rbase = TWL4030_MADC_GPCH0_LSB,
+ .ctrl = TWL4030_MADC_CTRL_SW2,
+ },
+};
+
+/**
+ * twl4030_madc_channel_raw_read() - Function to read a particular channel value
+ * @madc: pointer to struct twl4030_madc_data
+ * @reg: lsb of ADC Channel
+ *
+ * Return: 0 on success, an error code otherwise.
+ */
+static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
+{
+ u16 val;
+ int ret;
+ /*
+ * For each ADC channel, we have MSB and LSB register pair. MSB address
+ * is always LSB address+1. reg parameter is the address of LSB register
+ */
+ ret = twl_i2c_read_u16(TWL4030_MODULE_MADC, &val, reg);
+ if (ret) {
+ dev_err(madc->dev, "unable to read register 0x%X\n", reg);
+ return ret;
+ }
+
+ return (int)(val >> 6);
+}
+
+/*
+ * Return battery temperature in degrees Celsius
+ * Or < 0 on failure.
+ */
+static int twl4030battery_temperature(int raw_volt)
+{
+ u8 val;
+ int temp, curr, volt, res, ret;
+
+ volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
+ /* Getting and calculating the supply current in micro amperes */
+ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
+ REG_BCICTL2);
+ if (ret < 0)
+ return ret;
+
+ curr = ((val & TWL4030_BCI_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 = twl4030_therm_tbl[temp];
+ if ((actual - res) >= 0)
+ break;
+ }
+
+ return temp + 1;
+}
+
+static int twl4030battery_current(int raw_volt)
+{
+ int ret;
+ u8 val;
+
+ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
+ TWL4030_BCI_BCICTL1);
+ if (ret)
+ return ret;
+ if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
+ return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
+ else /* slope of 0.88 mV/mA */
+ return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
+}
+
+/*
+ * Function to read channel values
+ * @madc - pointer to twl4030_madc_data struct
+ * @reg_base - Base address of the first channel
+ * @Channels - 16 bit bitmap. If the bit is set, channel's value is read
+ * @buf - The channel values are stored here. if read fails error
+ * @raw - Return raw values without conversion
+ * value is stored
+ * Returns the number of successfully read channels.
+ */
+static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
+ u8 reg_base, unsigned
+ long channels, int *buf,
+ bool raw)
+{
+ int count = 0;
+ int i;
+ u8 reg;
+
+ for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
+ reg = reg_base + (2 * i);
+ buf[i] = twl4030_madc_channel_raw_read(madc, reg);
+ if (buf[i] < 0) {
+ dev_err(madc->dev, "Unable to read register 0x%X\n",
+ reg);
+ return buf[i];
+ }
+ if (raw) {
+ count++;
+ continue;
+ }
+ switch (i) {
+ case 10:
+ buf[i] = twl4030battery_current(buf[i]);
+ if (buf[i] < 0) {
+ dev_err(madc->dev, "err reading current\n");
+ return buf[i];
+ } else {
+ count++;
+ buf[i] = buf[i] - 750;
+ }
+ break;
+ case 1:
+ buf[i] = twl4030battery_temperature(buf[i]);
+ if (buf[i] < 0) {
+ dev_err(madc->dev, "err reading temperature\n");
+ return buf[i];
+ } else {
+ buf[i] -= 3;
+ count++;
+ }
+ break;
+ default:
+ count++;
+ /* Analog Input (V) = conv_result * step_size / R
+ * conv_result = decimal value of 10-bit conversion
+ * result
+ * step size = 1.5 / (2 ^ 10 -1)
+ * R = Prescaler ratio for input channels.
+ * Result given in mV hence multiplied by 1000.
+ */
+ buf[i] = (buf[i] * 3 * 1000 *
+ twl4030_divider_ratios[i].denominator)
+ / (2 * 1023 *
+ twl4030_divider_ratios[i].numerator);
+ }
+ }
+
+ return count;
+}
+
+/*
+ * 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;
+ int ret;
+
+ if (!req || !twl4030_madc)
+ return -EINVAL;
+
+ mutex_lock(&twl4030_madc->lock);
+ if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
+ ret = -EINVAL;
+ goto out;
+ }
+ /* Do we have a conversion request ongoing */
+ if (twl4030_madc->requests[req->method].active) {
+ ret = -EBUSY;
+ goto out;
+ }
+ method = &twl4030_conversion_methods[req->method];
+ /* Select channels to be converted */
+ ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels, method->sel);
+ if (ret) {
+ dev_err(twl4030_madc->dev,
+ "unable to write sel register 0x%X\n", method->sel);
+ goto out;
+ }
+ /* Select averaging for all channels if do_avg is set */
+ if (req->do_avg) {
+ ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels,
+ method->avg);
+ if (ret) {
+ dev_err(twl4030_madc->dev,
+ "unable to write avg register 0x%X\n",
+ method->avg);
+ goto out;
+ }
+ }
+ 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);
+
+/**
+ * twl4030_madc_set_current_generator() - setup bias current
+ *
+ * @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.
+ *
+ * Function to enable or disable bias current for
+ * main battery type reading or temperature sensing
+ */
+static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
+ int chan, int on)
+{
+ int ret;
+ int regmask;
+ u8 regval;
+
+ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
+ ®val, TWL4030_BCI_BCICTL1);
+ if (ret) {
+ dev_err(madc->dev, "unable to read BCICTL1 reg 0x%X",
+ TWL4030_BCI_BCICTL1);
+ return ret;
+ }
+
+ regmask = chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
+ if (on)
+ regval |= regmask;
+ else
+ regval &= ~regmask;
+
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ regval, TWL4030_BCI_BCICTL1);
+ if (ret) {
+ dev_err(madc->dev, "unable to write BCICTL1 reg 0x%X\n",
+ TWL4030_BCI_BCICTL1);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Function that sets MADC software power on bit to enable MADC
+ * @madc - pointer to twl4030_madc_data struct
+ * @on - Enable or disable MADC software power on bit.
+ * returns error if i2c read/write fails else 0
+ */
+static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
+{
+ u8 regval;
+ int ret;
+
+ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
+ ®val, TWL4030_MADC_CTRL1);
+ if (ret) {
+ dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",
+ TWL4030_MADC_CTRL1);
+ return ret;
+ }
+ if (on)
+ regval |= TWL4030_MADC_MADCON;
+ else
+ regval &= ~TWL4030_MADC_MADCON;
+ ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, regval, TWL4030_MADC_CTRL1);
+ if (ret) {
+ dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",
+ TWL4030_MADC_CTRL1);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Initialize MADC and request for threaded irq
+ */
+static int twl4030_madc_probe(struct platform_device *pdev)
+{
+ struct twl4030_madc_data *madc;
+ struct twl4030_madc_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device_node *np = pdev->dev.of_node;
+ int irq, ret;
+ u8 regval;
+ struct iio_dev *iio_dev = NULL;
+
+ if (!pdata && !np) {
+ dev_err(&pdev->dev, "neither platform data nor Device Tree node available\n");
+ return -EINVAL;
+ }
+
+ iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*madc));
+ if (!iio_dev) {
+ dev_err(&pdev->dev, "failed allocating iio device\n");
+ return -ENOMEM;
+ }
+
+ madc = iio_priv(iio_dev);
+ madc->dev = &pdev->dev;
+
+ iio_dev->name = dev_name(&pdev->dev);
+ iio_dev->dev.parent = &pdev->dev;
+ iio_dev->dev.of_node = pdev->dev.of_node;
+ iio_dev->info = &twl4030_madc_iio_info;
+ iio_dev->modes = INDIO_DIRECT_MODE;
+ iio_dev->channels = twl4030_madc_iio_channels;
+ iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);
+
+ /*
+ * Phoenix provides 2 interrupt lines. The first one is connected to
+ * the OMAP. The other one can be connected to the other processor such
+ * as modem. Hence two separate ISR and IMR registers.
+ */
+ if (pdata)
+ madc->use_second_irq = (pdata->irq_line != 1);
+ else
+ madc->use_second_irq = of_property_read_bool(np,
+ "ti,system-uses-second-madc-irq");
+
+ madc->imr = madc->use_second_irq ? TWL4030_MADC_IMR2 :
+ TWL4030_MADC_IMR1;
+ madc->isr = madc->use_second_irq ? TWL4030_MADC_ISR2 :
+ TWL4030_MADC_ISR1;
+
+ ret = twl4030_madc_set_power(madc, 1);
+ if (ret < 0)
+ return ret;
+ ret = twl4030_madc_set_current_generator(madc, 0, 1);
+ if (ret < 0)
+ goto err_current_generator;
+
+ ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
+ ®val, TWL4030_BCI_BCICTL1);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",
+ TWL4030_BCI_BCICTL1);
+ goto err_i2c;
+ }
+ regval |= TWL4030_BCI_MESBAT;
+ ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
+ regval, TWL4030_BCI_BCICTL1);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",
+ TWL4030_BCI_BCICTL1);
+ goto err_i2c;
+ }
+
+ /* Check that MADC clock is on */
+ ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, ®val, TWL4030_REG_GPBR1);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to read reg GPBR1 0x%X\n",
+ TWL4030_REG_GPBR1);
+ goto err_i2c;
+ }
+
+ /* If MADC clk is not on, turn it on */
+ if (!(regval & TWL4030_GPBR1_MADC_HFCLK_EN)) {
+ dev_info(&pdev->dev, "clk disabled, enabling\n");
+ regval |= TWL4030_GPBR1_MADC_HFCLK_EN;
+ ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, regval,
+ TWL4030_REG_GPBR1);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to write reg GPBR1 0x%X\n",
+ TWL4030_REG_GPBR1);
+ goto err_i2c;
+ }
+ }
+
+ platform_set_drvdata(pdev, iio_dev);
+ mutex_init(&madc->lock);
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ twl4030_madc_threaded_irq_handler,
+ IRQF_TRIGGER_RISING, "twl4030_madc", madc);
+ if (ret) {
+ dev_err(&pdev->dev, "could not request irq\n");
+ goto err_i2c;
+ }
+ twl4030_madc = madc;
+
+ ret = iio_device_register(iio_dev);
+ if (ret) {
+ dev_err(&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);
+
+ iio_device_unregister(iio_dev);
+
+ twl4030_madc_set_current_generator(madc, 0, 0);
+ twl4030_madc_set_power(madc, 0);
+
+ 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");
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
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
+++ /dev/null
-/*
- *
- * TWL4030 MADC module driver-This driver monitors the real time
- * conversion of analog signals like battery temperature,
- * battery type, battery level etc.
- *
- * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
- * J Keerthy <j-keerthy@ti.com>
- *
- * Based on twl4030-madc.c
- * Copyright (C) 2008 Nokia Corporation
- * Mikko Ylinen <mikko.k.ylinen@nokia.com>
- *
- * Amit Kucheria <amit.kucheria@canonical.com>
- *
- * 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
- * @use_second_irq: IRQ selection (main or co-processor)
- * @imr: Interrupt mask register of MADC
- * @isr: Interrupt status register of MADC
- */
-struct twl4030_madc_data {
- struct device *dev;
- struct mutex lock; /* mutex protecting this data structure */
- struct 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 ret;
-
- req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;
-
- req.channels = BIT(chan->channel);
- req.active = false;
- req.func_cb = NULL;
- req.type = TWL4030_MADC_WAIT;
- req.raw = !(mask == IIO_CHAN_INFO_PROCESSED);
- req.do_avg = (mask == IIO_CHAN_INFO_AVERAGE_RAW);
-
- ret = twl4030_madc_conversion(&req);
- if (ret < 0)
- return ret;
-
- *val = req.rbuf[chan->channel];
-
- return IIO_VAL_INT;
-}
-
-static const struct iio_info twl4030_madc_iio_info = {
- .read_raw = &twl4030_madc_read,
- .driver_module = THIS_MODULE,
-};
-
-#define TWL4030_ADC_CHANNEL(_channel, _type, _name) { \
- .type = _type, \
- .channel = _channel, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
- BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
- BIT(IIO_CHAN_INFO_PROCESSED), \
- .datasheet_name = _name, \
- .indexed = 1, \
-}
-
-static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
- TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0"),
- TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1"),
- TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2"),
- TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3"),
- TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4"),
- TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5"),
- TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6"),
- TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7"),
- TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8"),
- TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9"),
- TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10"),
- TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11"),
- TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12"),
- TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13"),
- TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14"),
- TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15"),
-};
-
-static struct twl4030_madc_data *twl4030_madc;
-
-struct twl4030_prescale_divider_ratios {
- s16 numerator;
- s16 denominator;
-};
-
-static const struct twl4030_prescale_divider_ratios
-twl4030_divider_ratios[16] = {
- {1, 1}, /* CHANNEL 0 No Prescaler */
- {1, 1}, /* CHANNEL 1 No Prescaler */
- {6, 10}, /* CHANNEL 2 */
- {6, 10}, /* CHANNEL 3 */
- {6, 10}, /* CHANNEL 4 */
- {6, 10}, /* CHANNEL 5 */
- {6, 10}, /* CHANNEL 6 */
- {6, 10}, /* CHANNEL 7 */
- {3, 14}, /* CHANNEL 8 */
- {1, 3}, /* CHANNEL 9 */
- {1, 1}, /* CHANNEL 10 No Prescaler */
- {15, 100}, /* CHANNEL 11 */
- {1, 4}, /* CHANNEL 12 */
- {1, 1}, /* CHANNEL 13 Reserved channels */
- {1, 1}, /* CHANNEL 14 Reseved channels */
- {5, 11}, /* CHANNEL 15 */
-};
-
-
-/* Conversion table from -3 to 55 degrees Celcius */
-static int twl4030_therm_tbl[] = {
- 30800, 29500, 28300, 27100,
- 26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700,
- 17900, 17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100,
- 12600, 12100, 11600, 11200, 10800, 10400, 10000, 9630, 9280,
- 8950, 8620, 8310, 8020, 7730, 7460, 7200, 6950, 6710,
- 6470, 6250, 6040, 5830, 5640, 5450, 5260, 5090, 4920,
- 4760, 4600, 4450, 4310, 4170, 4040, 3910, 3790, 3670,
- 3550
-};
-
-/*
- * Structure containing the registers
- * of different conversion methods supported by MADC.
- * Hardware or RT real time conversion request initiated by external host
- * processor for RT Signal conversions.
- * External host processors can also request for non RT conversions
- * SW1 and SW2 software conversions also called asynchronous or GPC request.
- */
-static
-const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
- [TWL4030_MADC_RT] = {
- .sel = TWL4030_MADC_RTSELECT_LSB,
- .avg = TWL4030_MADC_RTAVERAGE_LSB,
- .rbase = TWL4030_MADC_RTCH0_LSB,
- },
- [TWL4030_MADC_SW1] = {
- .sel = TWL4030_MADC_SW1SELECT_LSB,
- .avg = TWL4030_MADC_SW1AVERAGE_LSB,
- .rbase = TWL4030_MADC_GPCH0_LSB,
- .ctrl = TWL4030_MADC_CTRL_SW1,
- },
- [TWL4030_MADC_SW2] = {
- .sel = TWL4030_MADC_SW2SELECT_LSB,
- .avg = TWL4030_MADC_SW2AVERAGE_LSB,
- .rbase = TWL4030_MADC_GPCH0_LSB,
- .ctrl = TWL4030_MADC_CTRL_SW2,
- },
-};
-
-/**
- * twl4030_madc_channel_raw_read() - Function to read a particular channel value
- * @madc: pointer to struct twl4030_madc_data
- * @reg: lsb of ADC Channel
- *
- * Return: 0 on success, an error code otherwise.
- */
-static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
-{
- u16 val;
- int ret;
- /*
- * For each ADC channel, we have MSB and LSB register pair. MSB address
- * is always LSB address+1. reg parameter is the address of LSB register
- */
- ret = twl_i2c_read_u16(TWL4030_MODULE_MADC, &val, reg);
- if (ret) {
- dev_err(madc->dev, "unable to read register 0x%X\n", reg);
- return ret;
- }
-
- return (int)(val >> 6);
-}
-
-/*
- * Return battery temperature in degrees Celsius
- * Or < 0 on failure.
- */
-static int twl4030battery_temperature(int raw_volt)
-{
- u8 val;
- int temp, curr, volt, res, ret;
-
- volt = (raw_volt * TEMP_STEP_SIZE) / TEMP_PSR_R;
- /* Getting and calculating the supply current in micro amperes */
- ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
- REG_BCICTL2);
- if (ret < 0)
- return ret;
-
- curr = ((val & TWL4030_BCI_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 = twl4030_therm_tbl[temp];
- if ((actual - res) >= 0)
- break;
- }
-
- return temp + 1;
-}
-
-static int twl4030battery_current(int raw_volt)
-{
- int ret;
- u8 val;
-
- ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val,
- TWL4030_BCI_BCICTL1);
- if (ret)
- return ret;
- if (val & TWL4030_BCI_CGAIN) /* slope of 0.44 mV/mA */
- return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R1;
- else /* slope of 0.88 mV/mA */
- return (raw_volt * CURR_STEP_SIZE) / CURR_PSR_R2;
-}
-
-/*
- * Function to read channel values
- * @madc - pointer to twl4030_madc_data struct
- * @reg_base - Base address of the first channel
- * @Channels - 16 bit bitmap. If the bit is set, channel's value is read
- * @buf - The channel values are stored here. if read fails error
- * @raw - Return raw values without conversion
- * value is stored
- * Returns the number of successfully read channels.
- */
-static int twl4030_madc_read_channels(struct twl4030_madc_data *madc,
- u8 reg_base, unsigned
- long channels, int *buf,
- bool raw)
-{
- int count = 0;
- int i;
- u8 reg;
-
- for_each_set_bit(i, &channels, TWL4030_MADC_MAX_CHANNELS) {
- reg = reg_base + (2 * i);
- buf[i] = twl4030_madc_channel_raw_read(madc, reg);
- if (buf[i] < 0) {
- dev_err(madc->dev, "Unable to read register 0x%X\n",
- reg);
- return buf[i];
- }
- if (raw) {
- count++;
- continue;
- }
- switch (i) {
- case 10:
- buf[i] = twl4030battery_current(buf[i]);
- if (buf[i] < 0) {
- dev_err(madc->dev, "err reading current\n");
- return buf[i];
- } else {
- count++;
- buf[i] = buf[i] - 750;
- }
- break;
- case 1:
- buf[i] = twl4030battery_temperature(buf[i]);
- if (buf[i] < 0) {
- dev_err(madc->dev, "err reading temperature\n");
- return buf[i];
- } else {
- buf[i] -= 3;
- count++;
- }
- break;
- default:
- count++;
- /* Analog Input (V) = conv_result * step_size / R
- * conv_result = decimal value of 10-bit conversion
- * result
- * step size = 1.5 / (2 ^ 10 -1)
- * R = Prescaler ratio for input channels.
- * Result given in mV hence multiplied by 1000.
- */
- buf[i] = (buf[i] * 3 * 1000 *
- twl4030_divider_ratios[i].denominator)
- / (2 * 1023 *
- twl4030_divider_ratios[i].numerator);
- }
- }
-
- return count;
-}
-
-/*
- * 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;
- int ret;
-
- if (!req || !twl4030_madc)
- return -EINVAL;
-
- mutex_lock(&twl4030_madc->lock);
- if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
- ret = -EINVAL;
- goto out;
- }
- /* Do we have a conversion request ongoing */
- if (twl4030_madc->requests[req->method].active) {
- ret = -EBUSY;
- goto out;
- }
- method = &twl4030_conversion_methods[req->method];
- /* Select channels to be converted */
- ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels, method->sel);
- if (ret) {
- dev_err(twl4030_madc->dev,
- "unable to write sel register 0x%X\n", method->sel);
- goto out;
- }
- /* Select averaging for all channels if do_avg is set */
- if (req->do_avg) {
- ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels,
- method->avg);
- if (ret) {
- dev_err(twl4030_madc->dev,
- "unable to write avg register 0x%X\n",
- method->avg);
- goto out;
- }
- }
- 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);
-
-/**
- * twl4030_madc_set_current_generator() - setup bias current
- *
- * @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.
- *
- * Function to enable or disable bias current for
- * main battery type reading or temperature sensing
- */
-static int twl4030_madc_set_current_generator(struct twl4030_madc_data *madc,
- int chan, int on)
-{
- int ret;
- int regmask;
- u8 regval;
-
- ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
- ®val, TWL4030_BCI_BCICTL1);
- if (ret) {
- dev_err(madc->dev, "unable to read BCICTL1 reg 0x%X",
- TWL4030_BCI_BCICTL1);
- return ret;
- }
-
- regmask = chan ? TWL4030_BCI_ITHEN : TWL4030_BCI_TYPEN;
- if (on)
- regval |= regmask;
- else
- regval &= ~regmask;
-
- ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
- regval, TWL4030_BCI_BCICTL1);
- if (ret) {
- dev_err(madc->dev, "unable to write BCICTL1 reg 0x%X\n",
- TWL4030_BCI_BCICTL1);
- return ret;
- }
-
- return 0;
-}
-
-/*
- * Function that sets MADC software power on bit to enable MADC
- * @madc - pointer to twl4030_madc_data struct
- * @on - Enable or disable MADC software power on bit.
- * returns error if i2c read/write fails else 0
- */
-static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
-{
- u8 regval;
- int ret;
-
- ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
- ®val, TWL4030_MADC_CTRL1);
- if (ret) {
- dev_err(madc->dev, "unable to read madc ctrl1 reg 0x%X\n",
- TWL4030_MADC_CTRL1);
- return ret;
- }
- if (on)
- regval |= TWL4030_MADC_MADCON;
- else
- regval &= ~TWL4030_MADC_MADCON;
- ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, regval, TWL4030_MADC_CTRL1);
- if (ret) {
- dev_err(madc->dev, "unable to write madc ctrl1 reg 0x%X\n",
- TWL4030_MADC_CTRL1);
- return ret;
- }
-
- return 0;
-}
-
-/*
- * Initialize MADC and request for threaded irq
- */
-static int twl4030_madc_probe(struct platform_device *pdev)
-{
- struct twl4030_madc_data *madc;
- struct twl4030_madc_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct device_node *np = pdev->dev.of_node;
- int irq, ret;
- u8 regval;
- struct iio_dev *iio_dev = NULL;
-
- if (!pdata && !np) {
- dev_err(&pdev->dev, "neither platform data nor Device Tree node available\n");
- return -EINVAL;
- }
-
- iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*madc));
- if (!iio_dev) {
- dev_err(&pdev->dev, "failed allocating iio device\n");
- return -ENOMEM;
- }
-
- madc = iio_priv(iio_dev);
- madc->dev = &pdev->dev;
-
- iio_dev->name = dev_name(&pdev->dev);
- iio_dev->dev.parent = &pdev->dev;
- iio_dev->dev.of_node = pdev->dev.of_node;
- iio_dev->info = &twl4030_madc_iio_info;
- iio_dev->modes = INDIO_DIRECT_MODE;
- iio_dev->channels = twl4030_madc_iio_channels;
- iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);
-
- /*
- * Phoenix provides 2 interrupt lines. The first one is connected to
- * the OMAP. The other one can be connected to the other processor such
- * as modem. Hence two separate ISR and IMR registers.
- */
- if (pdata)
- madc->use_second_irq = (pdata->irq_line != 1);
- else
- madc->use_second_irq = of_property_read_bool(np,
- "ti,system-uses-second-madc-irq");
-
- madc->imr = madc->use_second_irq ? TWL4030_MADC_IMR2 :
- TWL4030_MADC_IMR1;
- madc->isr = madc->use_second_irq ? TWL4030_MADC_ISR2 :
- TWL4030_MADC_ISR1;
-
- ret = twl4030_madc_set_power(madc, 1);
- if (ret < 0)
- return ret;
- ret = twl4030_madc_set_current_generator(madc, 0, 1);
- if (ret < 0)
- goto err_current_generator;
-
- ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE,
- ®val, TWL4030_BCI_BCICTL1);
- if (ret) {
- dev_err(&pdev->dev, "unable to read reg BCI CTL1 0x%X\n",
- TWL4030_BCI_BCICTL1);
- goto err_i2c;
- }
- regval |= TWL4030_BCI_MESBAT;
- ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
- regval, TWL4030_BCI_BCICTL1);
- if (ret) {
- dev_err(&pdev->dev, "unable to write reg BCI Ctl1 0x%X\n",
- TWL4030_BCI_BCICTL1);
- goto err_i2c;
- }
-
- /* Check that MADC clock is on */
- ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, ®val, TWL4030_REG_GPBR1);
- if (ret) {
- dev_err(&pdev->dev, "unable to read reg GPBR1 0x%X\n",
- TWL4030_REG_GPBR1);
- goto err_i2c;
- }
-
- /* If MADC clk is not on, turn it on */
- if (!(regval & TWL4030_GPBR1_MADC_HFCLK_EN)) {
- dev_info(&pdev->dev, "clk disabled, enabling\n");
- regval |= TWL4030_GPBR1_MADC_HFCLK_EN;
- ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, regval,
- TWL4030_REG_GPBR1);
- if (ret) {
- dev_err(&pdev->dev, "unable to write reg GPBR1 0x%X\n",
- TWL4030_REG_GPBR1);
- goto err_i2c;
- }
- }
-
- platform_set_drvdata(pdev, iio_dev);
- mutex_init(&madc->lock);
-
- irq = platform_get_irq(pdev, 0);
- ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
- twl4030_madc_threaded_irq_handler,
- IRQF_TRIGGER_RISING, "twl4030_madc", madc);
- if (ret) {
- dev_err(&pdev->dev, "could not request irq\n");
- goto err_i2c;
- }
- twl4030_madc = madc;
-
- ret = iio_device_register(iio_dev);
- if (ret) {
- dev_err(&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);
-
- iio_device_unregister(iio_dev);
-
- twl4030_madc_set_current_generator(madc, 0, 0);
- twl4030_madc_set_power(madc, 0);
-
- 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");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff