Introducing a driver for MADC on TWL4030 powerIC. MADC stands for monitoring ADC. This driver monitors the real time conversion of analog signals like battery temperature, battery cuurent etc. Signed-off-by: Keerthy <j-keerthy@xxxxxx> --- V3: Added for_each_set_bit for efficient bit checking and locking the mutex earlier in the threaded irq handler. V2: Added functions to convert raw voltages to current and temperature. V1: http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg44543.html drivers/mfd/Kconfig | 10 + drivers/mfd/Makefile | 1 + drivers/mfd/twl4030-madc.c | 813 ++++++++++++++++++++++++++++++++++++++ include/linux/i2c/twl4030-madc.h | 142 +++++++ 4 files changed, 966 insertions(+), 0 deletions(-) create mode 100644 drivers/mfd/twl4030-madc.c create mode 100644 include/linux/i2c/twl4030-madc.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index fd01836..029e078 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -167,6 +167,16 @@ config TWL4030_CORE high speed USB OTG transceiver, an audio codec (on most versions) and many other features. +config TWL4030_MADC + tristate "Texas Instruments 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 "Support power resources on TWL4030 family chips" depends on TWL4030_CORE && ARM diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index a54e2c7..2922cc2 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_TPS6507X) += tps6507x.o obj-$(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_TWL4030_CODEC) += twl4030-codec.o obj-$(CONFIG_TWL6030_PWM) += twl6030-pwm.o diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c new file mode 100644 index 0000000..752c593 --- /dev/null +++ b/drivers/mfd/twl4030-madc.c @@ -0,0 +1,813 @@ +/* + * + * 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/interrupt.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> + +/* + * struct twl4030_madc_data - a container for madc info + * @dev - pointer to device structure for madc + * @lock - mutex protecting this data structire + * @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 structire */ + struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS]; + int imr; + int isr; +}; + +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 NA */ + {15, 100}, /* CHANNEL 11 */ + {1, 4}, /* CHANNEL 12 */ + {1, 1}, /* CHANNEL 13 NA */ + {1, 1}, /* CHANNEL 14 NA */ + {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 intiated by external host + * processor for RT Signal conversions. + * External host processors can also request for non RT converions + * 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 struct + * @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 addr 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(TWL4030_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; + } + /* Negative temperature */ + if (temp < 3) { + if (temp == 2) + temp = -1; + else if (temp == 1) + temp = -2; + else + temp = -3; + } + + return temp + 1; +} + +static int twl4030battery_current(int raw_volt) +{ + int ret; + u8 val; + + ret = twl_i2c_read_u8(TWL4030_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 + * @Channel - 16 bit bitmap. If the bit is set channel value is read + * @buf - The channel values are stored here. if read fails error + * 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) +{ + 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; + } else { + switch (i) { + case 10: + buf[i] = + twl4030battery_current(buf[i]); + if (buf[i] < 0) { + dev_err(madc->dev, + "error reading current"); + 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, + "error reading temperature"); + count_req++; + } else { + 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_dbg(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); + /* 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 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); + /* 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 mili seconds + * @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 correspoding 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) + 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); + return ret; + } + 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); + return ret; + } + /* 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); + return ret; + } + 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); + return ret; + } + } + 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); + 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(TWL4030_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(TWL4030_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 diable 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(TWL4030_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 __devinit twl4030_madc_probe(struct platform_device *pdev) +{ + struct twl4030_madc_data *madc; + struct twl4030_madc_platform_data *pdata = pdev->dev.platform_data; + int ret; + u8 regval; + + if (!pdata) { + dev_dbg(&pdev->dev, "platform_data not available\n"); + return -EINVAL; + } + madc = kzalloc(sizeof(*madc), GFP_KERNEL); + if (!madc) + return -ENOMEM; + + /* + * Phoenix provides 2 interrupt lines. The first one is connected to + * the OMAP. The other one can be connected to other processor such + * as modem. Hence two separate ISR and IMR registers. + */ + madc->imr = (pdata->irq_line == 1) ? + TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2; + madc->isr = (pdata->irq_line == 1) ? + TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2; + ret = twl4030_madc_set_power(madc, 1); + if (ret < 0) + goto err_power; + ret = twl4030_madc_set_current_generator(madc, 0, 1); + if (ret < 0) + goto err_current_generator; + + ret = twl_i2c_read_u8(TWL4030_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(TWL4030_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; + } + platform_set_drvdata(pdev, madc); + mutex_init(&madc->lock); + ret = request_threaded_irq(platform_get_irq(pdev, 0), NULL, + twl4030_madc_threaded_irq_handler, + IRQF_TRIGGER_RISING, "twl4030_madc", madc); + if (ret) { + dev_dbg(&pdev->dev, "could not request irq\n"); + goto err_irq; + } + twl4030_madc = madc; + return 0; +err_irq: + platform_set_drvdata(pdev, NULL); +err_i2c: + twl4030_madc_set_current_generator(madc, 0, 0); +err_current_generator: + twl4030_madc_set_power(madc, 0); +err_power: + kfree(madc); + + return ret; +} + +static int __devexit twl4030_madc_remove(struct platform_device *pdev) +{ + struct twl4030_madc_data *madc = platform_get_drvdata(pdev); + + free_irq(platform_get_irq(pdev, 0), madc); + platform_set_drvdata(pdev, NULL); + twl4030_madc_set_current_generator(madc, 0, 0); + twl4030_madc_set_power(madc, 0); + kfree(madc); + + return 0; +} + +static struct platform_driver twl4030_madc_driver = { + .probe = twl4030_madc_probe, + .remove = __exit_p(twl4030_madc_remove), + .driver = { + .name = "twl4030_madc", + .owner = THIS_MODULE, + }, +}; + +static int __init twl4030_madc_init(void) +{ + return platform_driver_register(&twl4030_madc_driver); +} + +module_init(twl4030_madc_init); + +static void __exit twl4030_madc_exit(void) +{ + platform_driver_unregister(&twl4030_madc_driver); +} + +module_exit(twl4030_madc_exit); + +MODULE_DESCRIPTION("TWL4030 ADC driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("J Keerthy"); +MODULE_ALIAS("twl4030_madc"); diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h new file mode 100644 index 0000000..24f3a70 --- /dev/null +++ b/include/linux/i2c/twl4030-madc.h @@ -0,0 +1,142 @@ +/* + * twl4030_madc.h - Header for TWL4030 MADC + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ + * J Keerthy <j-keerthy@xxxxxx> + * + * 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 + * + */ + +#ifndef _TWL4030_MADC_H +#define _TWL4030_MADC_H + +struct twl4030_madc_conversion_method { + u8 sel; + u8 avg; + u8 rbase; + u8 ctrl; +}; + +#define TWL4030_MADC_MAX_CHANNELS 16 + + +/* + * twl4030_madc_request- madc request packet for channel conversion + * @channels: 16 bit bitmap for individual channels + * @do_avgP: sample the input channel for 4 consecutive cycles + * @method: RT, SW1, SW2 + * @type: Polling or interrupt based method + */ + +struct twl4030_madc_request { + unsigned long channels; /* 16 bit bitmap for individual channels */ + u16 do_avg; /* sample the input channel for 4 consecutive cycles + and provide the average of 4 conversions */ + u16 method; /* RT, SW1, SW2 */ + u16 type; /*polling or interrupt based */ + bool active; + bool result_pending; + int rbuf[TWL4030_MADC_MAX_CHANNELS]; + void (*func_cb)(int len, int channels, int *buf); +}; + +enum conversion_methods { + TWL4030_MADC_RT, + TWL4030_MADC_SW1, + TWL4030_MADC_SW2, + TWL4030_MADC_NUM_METHODS +}; + +enum sample_type { + TWL4030_MADC_WAIT, + TWL4030_MADC_IRQ_ONESHOT, + TWL4030_MADC_IRQ_REARM +}; + +#define TWL4030_MADC_CTRL1 0x00 +#define TWL4030_MADC_CTRL2 0x01 + +#define TWL4030_MADC_RTSELECT_LSB 0x02 +#define TWL4030_MADC_SW1SELECT_LSB 0x06 +#define TWL4030_MADC_SW2SELECT_LSB 0x0A + +#define TWL4030_MADC_RTAVERAGE_LSB 0x04 +#define TWL4030_MADC_SW1AVERAGE_LSB 0x08 +#define TWL4030_MADC_SW2AVERAGE_LSB 0x0C + +#define TWL4030_MADC_CTRL_SW1 0x12 +#define TWL4030_MADC_CTRL_SW2 0x13 + +#define TWL4030_MADC_RTCH0_LSB 0x17 +#define TWL4030_MADC_GPCH0_LSB 0x37 + +#define TWL4030_MADC_MADCON (1 << 0) /* MADC power on */ +#define TWL4030_MADC_BUSY (1 << 0) /* MADC busy */ +/* MADC conversion completion */ +#define TWL4030_MADC_EOC_SW (1 << 1) +/* MADC SWx start conversion */ +#define TWL4030_MADC_SW_START (1 << 5) +#define TWL4030_MADC_ADCIN0 (1 << 0) +#define TWL4030_MADC_ADCIN1 (1 << 1) +#define TWL4030_MADC_ADCIN2 (1 << 2) +#define TWL4030_MADC_ADCIN3 (1 << 3) +#define TWL4030_MADC_ADCIN4 (1 << 4) +#define TWL4030_MADC_ADCIN5 (1 << 5) +#define TWL4030_MADC_ADCIN6 (1 << 6) +#define TWL4030_MADC_ADCIN7 (1 << 7) +#define TWL4030_MADC_ADCIN8 (1 << 8) +#define TWL4030_MADC_ADCIN9 (1 << 9) +#define TWL4030_MADC_ADCIN10 (1 << 10) +#define TWL4030_MADC_ADCIN11 (1 << 11) +#define TWL4030_MADC_ADCIN12 (1 << 12) +#define TWL4030_MADC_ADCIN13 (1 << 13) +#define TWL4030_MADC_ADCIN14 (1 << 14) +#define TWL4030_MADC_ADCIN15 (1 << 15) + +/* Fixed channels */ +#define TWL4030_MADC_BTEMP TWL4030_MADC_ADCIN1 +#define TWL4030_MADC_VBUS TWL4030_MADC_ADCIN8 +#define TWL4030_MADC_VBKB TWL4030_MADC_ADCIN9 +#define TWL4030_MADC_ICHG TWL4030_MADC_ADCIN10 +#define TWL4030_MADC_VCHG TWL4030_MADC_ADCIN11 +#define TWL4030_MADC_VBAT TWL4030_MADC_ADCIN12 + +/* Step size and prescaler ratio */ +#define TEMP_STEP_SIZE 147 +#define TEMP_PSR_R 100 +#define CURR_STEP_SIZE 147 +#define CURR_PSR_R1 44 +#define CURR_PSR_R2 88 + +#define TWL4030_BCI_BCICTL1 0x23 +#define TWL4030_BCI_CGAIN 0x020 +#define TWL4030_BCI_MESBAT (1 << 1) +#define TWL4030_BCI_TYPEN (1 << 4) +#define TWL4030_BCI_ITHEN (1 << 3) + +#define REG_BCICTL2 0x024 +#define TWL4030_BCI_ITHSENS 0x007 + +struct twl4030_madc_user_parms { + int channel; + int average; + int status; + u16 result; +}; + +int twl4030_madc_conversion(struct twl4030_madc_request *conv); +int twl4030_get_madc_conversion(int channel_no); +#endif -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
