| /* |
| * TWL6030 GPADC module driver |
| * |
| * Copyright (C) 2009-2013 Texas Instruments Inc. |
| * Nishant Kamat <nskamat@ti.com> |
| * Balaji T K <balajitk@ti.com> |
| * Graeme Gregory <gg@slimlogic.co.uk> |
| * Girish S Ghongdemath <girishsg@ti.com> |
| * Ambresh K <ambresh@ti.com> |
| * Oleksandr Kozaruk <oleksandr.kozaruk@ti.com |
| * |
| * Based on twl4030-madc.c |
| * Copyright (C) 2008 Nokia Corporation |
| * Mikko Ylinen <mikko.k.ylinen@nokia.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/interrupt.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/of_platform.h> |
| #include <linux/i2c/twl.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #define DRIVER_NAME "twl6030_gpadc" |
| |
| /* |
| * twl6030 per TRM has 17 channels, and twl6032 has 19 channels |
| * 2 test network channels are not used, |
| * 2 die temperature channels are not used either, as it is not |
| * defined how to convert ADC value to temperature |
| */ |
| #define TWL6030_GPADC_USED_CHANNELS 13 |
| #define TWL6030_GPADC_MAX_CHANNELS 15 |
| #define TWL6032_GPADC_USED_CHANNELS 15 |
| #define TWL6032_GPADC_MAX_CHANNELS 19 |
| #define TWL6030_GPADC_NUM_TRIM_REGS 16 |
| |
| #define TWL6030_GPADC_CTRL_P1 0x05 |
| |
| #define TWL6032_GPADC_GPSELECT_ISB 0x07 |
| #define TWL6032_GPADC_CTRL_P1 0x08 |
| |
| #define TWL6032_GPADC_GPCH0_LSB 0x0d |
| #define TWL6032_GPADC_GPCH0_MSB 0x0e |
| |
| #define TWL6030_GPADC_CTRL_P1_SP1 BIT(3) |
| |
| #define TWL6030_GPADC_GPCH0_LSB (0x29) |
| |
| #define TWL6030_GPADC_RT_SW1_EOC_MASK BIT(5) |
| |
| #define TWL6030_GPADC_TRIM1 0xCD |
| |
| #define TWL6030_REG_TOGGLE1 0x90 |
| #define TWL6030_GPADCS BIT(1) |
| #define TWL6030_GPADCR BIT(0) |
| |
| /** |
| * struct twl6030_chnl_calib - channel calibration |
| * @gain: slope coefficient for ideal curve |
| * @gain_error: gain error |
| * @offset_error: offset of the real curve |
| */ |
| struct twl6030_chnl_calib { |
| s32 gain; |
| s32 gain_error; |
| s32 offset_error; |
| }; |
| |
| /** |
| * struct twl6030_ideal_code - GPADC calibration parameters |
| * GPADC is calibrated in two points: close to the beginning and |
| * to the and of the measurable input range |
| * |
| * @channel: channel number |
| * @code1: ideal code for the input at the beginning |
| * @code2: ideal code for at the end of the range |
| * @volt1: voltage input at the beginning(low voltage) |
| * @volt2: voltage input at the end(high voltage) |
| */ |
| struct twl6030_ideal_code { |
| int channel; |
| u16 code1; |
| u16 code2; |
| u16 volt1; |
| u16 volt2; |
| }; |
| |
| struct twl6030_gpadc_data; |
| |
| /** |
| * struct twl6030_gpadc_platform_data - platform specific data |
| * @nchannels: number of GPADC channels |
| * @iio_channels: iio channels |
| * @twl6030_ideal: pointer to calibration parameters |
| * @start_conversion: pointer to ADC start conversion function |
| * @channel_to_reg pointer to ADC function to convert channel to |
| * register address for reading conversion result |
| * @calibrate: pointer to calibration function |
| */ |
| struct twl6030_gpadc_platform_data { |
| const int nchannels; |
| const struct iio_chan_spec *iio_channels; |
| const struct twl6030_ideal_code *ideal; |
| int (*start_conversion)(int channel); |
| u8 (*channel_to_reg)(int channel); |
| int (*calibrate)(struct twl6030_gpadc_data *gpadc); |
| }; |
| |
| /** |
| * struct twl6030_gpadc_data - GPADC data |
| * @dev: device pointer |
| * @lock: mutual exclusion lock for the structure |
| * @irq_complete: completion to signal end of conversion |
| * @twl6030_cal_tbl: pointer to calibration data for each |
| * channel with gain error and offset |
| * @pdata: pointer to device specific data |
| */ |
| struct twl6030_gpadc_data { |
| struct device *dev; |
| struct mutex lock; |
| struct completion irq_complete; |
| struct twl6030_chnl_calib *twl6030_cal_tbl; |
| const struct twl6030_gpadc_platform_data *pdata; |
| }; |
| |
| /* |
| * channels 11, 12, 13, 15 and 16 have no calibration data |
| * calibration offset is same for channels 1, 3, 4, 5 |
| * |
| * The data is taken from GPADC_TRIM registers description. |
| * GPADC_TRIM registers keep difference between the code measured |
| * at volt1 and volt2 input voltages and corresponding code1 and code2 |
| */ |
| static const struct twl6030_ideal_code |
| twl6030_ideal[TWL6030_GPADC_USED_CHANNELS] = { |
| [0] = { /* ch 0, external, battery type, resistor value */ |
| .channel = 0, |
| .code1 = 116, |
| .code2 = 745, |
| .volt1 = 141, |
| .volt2 = 910, |
| }, |
| [1] = { /* ch 1, external, battery temperature, NTC resistor value */ |
| .channel = 1, |
| .code1 = 82, |
| .code2 = 900, |
| .volt1 = 100, |
| .volt2 = 1100, |
| }, |
| [2] = { /* ch 2, external, audio accessory/general purpose */ |
| .channel = 2, |
| .code1 = 55, |
| .code2 = 818, |
| .volt1 = 101, |
| .volt2 = 1499, |
| }, |
| [3] = { /* ch 3, external, general purpose */ |
| .channel = 3, |
| .code1 = 82, |
| .code2 = 900, |
| .volt1 = 100, |
| .volt2 = 1100, |
| }, |
| [4] = { /* ch 4, external, temperature measurement/general purpose */ |
| .channel = 4, |
| .code1 = 82, |
| .code2 = 900, |
| .volt1 = 100, |
| .volt2 = 1100, |
| }, |
| [5] = { /* ch 5, external, general purpose */ |
| .channel = 5, |
| .code1 = 82, |
| .code2 = 900, |
| .volt1 = 100, |
| .volt2 = 1100, |
| }, |
| [6] = { /* ch 6, external, general purpose */ |
| .channel = 6, |
| .code1 = 82, |
| .code2 = 900, |
| .volt1 = 100, |
| .volt2 = 1100, |
| }, |
| [7] = { /* ch 7, internal, main battery */ |
| .channel = 7, |
| .code1 = 614, |
| .code2 = 941, |
| .volt1 = 3001, |
| .volt2 = 4599, |
| }, |
| [8] = { /* ch 8, internal, backup battery */ |
| .channel = 8, |
| .code1 = 82, |
| .code2 = 688, |
| .volt1 = 501, |
| .volt2 = 4203, |
| }, |
| [9] = { /* ch 9, internal, external charger input */ |
| .channel = 9, |
| .code1 = 182, |
| .code2 = 818, |
| .volt1 = 2001, |
| .volt2 = 8996, |
| }, |
| [10] = { /* ch 10, internal, VBUS */ |
| .channel = 10, |
| .code1 = 149, |
| .code2 = 818, |
| .volt1 = 1001, |
| .volt2 = 5497, |
| }, |
| [11] = { /* ch 11, internal, VBUS charging current */ |
| .channel = 11, |
| }, |
| /* ch 12, internal, Die temperature */ |
| /* ch 13, internal, Die temperature */ |
| [12] = { /* ch 14, internal, USB ID line */ |
| .channel = 14, |
| .code1 = 48, |
| .code2 = 714, |
| .volt1 = 323, |
| .volt2 = 4800, |
| }, |
| }; |
| |
| static const struct twl6030_ideal_code |
| twl6032_ideal[TWL6032_GPADC_USED_CHANNELS] = { |
| [0] = { /* ch 0, external, battery type, resistor value */ |
| .channel = 0, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [1] = { /* ch 1, external, battery temperature, NTC resistor value */ |
| .channel = 1, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [2] = { /* ch 2, external, audio accessory/general purpose */ |
| .channel = 2, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 660, |
| .volt2 = 1500, |
| }, |
| [3] = { /* ch 3, external, temperature with external diode/general |
| purpose */ |
| .channel = 3, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [4] = { /* ch 4, external, temperature measurement/general purpose */ |
| .channel = 4, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [5] = { /* ch 5, external, general purpose */ |
| .channel = 5, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [6] = { /* ch 6, external, general purpose */ |
| .channel = 6, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 440, |
| .volt2 = 1000, |
| }, |
| [7] = { /* ch7, internal, system supply */ |
| .channel = 7, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 2200, |
| .volt2 = 5000, |
| }, |
| [8] = { /* ch8, internal, backup battery */ |
| .channel = 8, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 2200, |
| .volt2 = 5000, |
| }, |
| [9] = { /* ch 9, internal, external charger input */ |
| .channel = 9, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 3960, |
| .volt2 = 9000, |
| }, |
| [10] = { /* ch10, internal, VBUS */ |
| .channel = 10, |
| .code1 = 150, |
| .code2 = 751, |
| .volt1 = 1000, |
| .volt2 = 5000, |
| }, |
| [11] = { /* ch 11, internal, VBUS DC-DC output current */ |
| .channel = 11, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 660, |
| .volt2 = 1500, |
| }, |
| /* ch 12, internal, Die temperature */ |
| /* ch 13, internal, Die temperature */ |
| [12] = { /* ch 14, internal, USB ID line */ |
| .channel = 14, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 2420, |
| .volt2 = 5500, |
| }, |
| /* ch 15, internal, test network */ |
| /* ch 16, internal, test network */ |
| [13] = { /* ch 17, internal, battery charging current */ |
| .channel = 17, |
| }, |
| [14] = { /* ch 18, internal, battery voltage */ |
| .channel = 18, |
| .code1 = 1441, |
| .code2 = 3276, |
| .volt1 = 2200, |
| .volt2 = 5000, |
| }, |
| }; |
| |
| static inline int twl6030_gpadc_write(u8 reg, u8 val) |
| { |
| return twl_i2c_write_u8(TWL6030_MODULE_GPADC, val, reg); |
| } |
| |
| static inline int twl6030_gpadc_read(u8 reg, u8 *val) |
| { |
| |
| return twl_i2c_read(TWL6030_MODULE_GPADC, val, reg, 2); |
| } |
| |
| static int twl6030_gpadc_enable_irq(u8 mask) |
| { |
| int ret; |
| |
| ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_LINE_B); |
| if (ret < 0) |
| return ret; |
| |
| ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_STS_B); |
| |
| return ret; |
| } |
| |
| static void twl6030_gpadc_disable_irq(u8 mask) |
| { |
| twl6030_interrupt_mask(mask, REG_INT_MSK_LINE_B); |
| twl6030_interrupt_mask(mask, REG_INT_MSK_STS_B); |
| } |
| |
| static irqreturn_t twl6030_gpadc_irq_handler(int irq, void *indio_dev) |
| { |
| struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev); |
| |
| complete(&gpadc->irq_complete); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int twl6030_start_conversion(int channel) |
| { |
| return twl6030_gpadc_write(TWL6030_GPADC_CTRL_P1, |
| TWL6030_GPADC_CTRL_P1_SP1); |
| } |
| |
| static int twl6032_start_conversion(int channel) |
| { |
| int ret; |
| |
| ret = twl6030_gpadc_write(TWL6032_GPADC_GPSELECT_ISB, channel); |
| if (ret) |
| return ret; |
| |
| return twl6030_gpadc_write(TWL6032_GPADC_CTRL_P1, |
| TWL6030_GPADC_CTRL_P1_SP1); |
| } |
| |
| static u8 twl6030_channel_to_reg(int channel) |
| { |
| return TWL6030_GPADC_GPCH0_LSB + 2 * channel; |
| } |
| |
| static u8 twl6032_channel_to_reg(int channel) |
| { |
| /* |
| * for any prior chosen channel, when the conversion is ready |
| * the result is avalable in GPCH0_LSB, GPCH0_MSB. |
| */ |
| |
| return TWL6032_GPADC_GPCH0_LSB; |
| } |
| |
| static int twl6030_gpadc_lookup(const struct twl6030_ideal_code *ideal, |
| int channel, int size) |
| { |
| int i; |
| |
| for (i = 0; i < size; i++) |
| if (ideal[i].channel == channel) |
| break; |
| |
| return i; |
| } |
| |
| static int twl6030_channel_calibrated(const struct twl6030_gpadc_platform_data |
| *pdata, int channel) |
| { |
| const struct twl6030_ideal_code *ideal = pdata->ideal; |
| int i; |
| |
| i = twl6030_gpadc_lookup(ideal, channel, pdata->nchannels); |
| /* not calibrated channels have 0 in all structure members */ |
| return pdata->ideal[i].code2; |
| } |
| |
| static int twl6030_gpadc_make_correction(struct twl6030_gpadc_data *gpadc, |
| int channel, int raw_code) |
| { |
| const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
| int corrected_code; |
| int i; |
| |
| i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
| corrected_code = ((raw_code * 1000) - |
| gpadc->twl6030_cal_tbl[i].offset_error) / |
| gpadc->twl6030_cal_tbl[i].gain_error; |
| |
| return corrected_code; |
| } |
| |
| static int twl6030_gpadc_get_raw(struct twl6030_gpadc_data *gpadc, |
| int channel, int *res) |
| { |
| u8 reg = gpadc->pdata->channel_to_reg(channel); |
| __le16 val; |
| int raw_code; |
| int ret; |
| |
| ret = twl6030_gpadc_read(reg, (u8 *)&val); |
| if (ret) { |
| dev_dbg(gpadc->dev, "unable to read register 0x%X\n", reg); |
| return ret; |
| } |
| |
| raw_code = le16_to_cpu(val); |
| dev_dbg(gpadc->dev, "GPADC raw code: %d", raw_code); |
| |
| if (twl6030_channel_calibrated(gpadc->pdata, channel)) |
| *res = twl6030_gpadc_make_correction(gpadc, channel, raw_code); |
| else |
| *res = raw_code; |
| |
| return ret; |
| } |
| |
| static int twl6030_gpadc_get_processed(struct twl6030_gpadc_data *gpadc, |
| int channel, int *val) |
| { |
| const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
| int corrected_code; |
| int channel_value; |
| int i; |
| int ret; |
| |
| ret = twl6030_gpadc_get_raw(gpadc, channel, &corrected_code); |
| if (ret) |
| return ret; |
| |
| i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
| channel_value = corrected_code * |
| gpadc->twl6030_cal_tbl[i].gain; |
| |
| /* Shift back into mV range */ |
| channel_value /= 1000; |
| |
| dev_dbg(gpadc->dev, "GPADC corrected code: %d", corrected_code); |
| dev_dbg(gpadc->dev, "GPADC value: %d", channel_value); |
| |
| *val = channel_value; |
| |
| return ret; |
| } |
| |
| static int twl6030_gpadc_read_raw(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, |
| int *val, int *val2, long mask) |
| { |
| struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev); |
| int ret; |
| long timeout; |
| |
| mutex_lock(&gpadc->lock); |
| |
| ret = gpadc->pdata->start_conversion(chan->channel); |
| if (ret) { |
| dev_err(gpadc->dev, "failed to start conversion\n"); |
| goto err; |
| } |
| /* wait for conversion to complete */ |
| timeout = wait_for_completion_interruptible_timeout( |
| &gpadc->irq_complete, msecs_to_jiffies(5000)); |
| if (timeout == 0) { |
| ret = -ETIMEDOUT; |
| goto err; |
| } else if (timeout < 0) { |
| ret = -EINTR; |
| goto err; |
| } |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val); |
| ret = ret ? -EIO : IIO_VAL_INT; |
| break; |
| |
| case IIO_CHAN_INFO_PROCESSED: |
| ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val); |
| ret = ret ? -EIO : IIO_VAL_INT; |
| break; |
| |
| default: |
| break; |
| } |
| err: |
| mutex_unlock(&gpadc->lock); |
| |
| return ret; |
| } |
| |
| /* |
| * The GPADC channels are calibrated using a two point calibration method. |
| * The channels measured with two known values: volt1 and volt2, and |
| * ideal corresponding output codes are known: code1, code2. |
| * The difference(d1, d2) between ideal and measured codes stored in trim |
| * registers. |
| * The goal is to find offset and gain of the real curve for each calibrated |
| * channel. |
| * gain: k = 1 + ((d2 - d1) / (x2 - x1)) |
| * offset: b = d1 + (k - 1) * x1 |
| */ |
| static void twl6030_calibrate_channel(struct twl6030_gpadc_data *gpadc, |
| int channel, int d1, int d2) |
| { |
| int b, k, gain, x1, x2, i; |
| const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
| |
| i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
| |
| /* Gain */ |
| gain = ((ideal[i].volt2 - ideal[i].volt1) * 1000) / |
| (ideal[i].code2 - ideal[i].code1); |
| |
| x1 = ideal[i].code1; |
| x2 = ideal[i].code2; |
| |
| /* k - real curve gain */ |
| k = 1000 + (((d2 - d1) * 1000) / (x2 - x1)); |
| |
| /* b - offset of the real curve gain */ |
| b = (d1 * 1000) - (k - 1000) * x1; |
| |
| gpadc->twl6030_cal_tbl[i].gain = gain; |
| gpadc->twl6030_cal_tbl[i].gain_error = k; |
| gpadc->twl6030_cal_tbl[i].offset_error = b; |
| |
| dev_dbg(gpadc->dev, "GPADC d1 for Chn: %d = %d\n", channel, d1); |
| dev_dbg(gpadc->dev, "GPADC d2 for Chn: %d = %d\n", channel, d2); |
| dev_dbg(gpadc->dev, "GPADC x1 for Chn: %d = %d\n", channel, x1); |
| dev_dbg(gpadc->dev, "GPADC x2 for Chn: %d = %d\n", channel, x2); |
| dev_dbg(gpadc->dev, "GPADC Gain for Chn: %d = %d\n", channel, gain); |
| dev_dbg(gpadc->dev, "GPADC k for Chn: %d = %d\n", channel, k); |
| dev_dbg(gpadc->dev, "GPADC b for Chn: %d = %d\n", channel, b); |
| } |
| |
| static inline int twl6030_gpadc_get_trim_offset(s8 d) |
| { |
| /* |
| * XXX NOTE! |
| * bit 0 - sign, bit 7 - reserved, 6..1 - trim value |
| * though, the documentation states that trim value |
| * is absolute value, the correct conversion results are |
| * obtained if the value is interpreted as 2's complement. |
| */ |
| __u32 temp = ((d & 0x7f) >> 1) | ((d & 1) << 6); |
| |
| return sign_extend32(temp, 6); |
| } |
| |
| static int twl6030_calibration(struct twl6030_gpadc_data *gpadc) |
| { |
| int ret; |
| int chn; |
| u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS]; |
| s8 d1, d2; |
| |
| /* |
| * for calibration two measurements have been performed at |
| * factory, for some channels, during the production test and |
| * have been stored in registers. This two stored values are |
| * used to correct the measurements. The values represent |
| * offsets for the given input from the output on ideal curve. |
| */ |
| ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs, |
| TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS); |
| if (ret < 0) { |
| dev_err(gpadc->dev, "calibration failed\n"); |
| return ret; |
| } |
| |
| for (chn = 0; chn < TWL6030_GPADC_MAX_CHANNELS; chn++) { |
| |
| switch (chn) { |
| case 0: |
| d1 = trim_regs[0]; |
| d2 = trim_regs[1]; |
| break; |
| case 1: |
| case 3: |
| case 4: |
| case 5: |
| case 6: |
| d1 = trim_regs[4]; |
| d2 = trim_regs[5]; |
| break; |
| case 2: |
| d1 = trim_regs[12]; |
| d2 = trim_regs[13]; |
| break; |
| case 7: |
| d1 = trim_regs[6]; |
| d2 = trim_regs[7]; |
| break; |
| case 8: |
| d1 = trim_regs[2]; |
| d2 = trim_regs[3]; |
| break; |
| case 9: |
| d1 = trim_regs[8]; |
| d2 = trim_regs[9]; |
| break; |
| case 10: |
| d1 = trim_regs[10]; |
| d2 = trim_regs[11]; |
| break; |
| case 14: |
| d1 = trim_regs[14]; |
| d2 = trim_regs[15]; |
| break; |
| default: |
| continue; |
| } |
| |
| d1 = twl6030_gpadc_get_trim_offset(d1); |
| d2 = twl6030_gpadc_get_trim_offset(d2); |
| |
| twl6030_calibrate_channel(gpadc, chn, d1, d2); |
| } |
| |
| return 0; |
| } |
| |
| static int twl6032_get_trim_value(u8 *trim_regs, unsigned int reg0, |
| unsigned int reg1, unsigned int mask0, unsigned int mask1, |
| unsigned int shift0) |
| { |
| int val; |
| |
| val = (trim_regs[reg0] & mask0) << shift0; |
| val |= (trim_regs[reg1] & mask1) >> 1; |
| if (trim_regs[reg1] & 0x01) |
| val = -val; |
| |
| return val; |
| } |
| |
| static int twl6032_calibration(struct twl6030_gpadc_data *gpadc) |
| { |
| int chn, d1 = 0, d2 = 0, temp; |
| u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS]; |
| int ret; |
| |
| ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs, |
| TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS); |
| if (ret < 0) { |
| dev_err(gpadc->dev, "calibration failed\n"); |
| return ret; |
| } |
| |
| /* |
| * Loop to calculate the value needed for returning voltages from |
| * GPADC not values. |
| * |
| * gain is calculated to 3 decimal places fixed point. |
| */ |
| for (chn = 0; chn < TWL6032_GPADC_MAX_CHANNELS; chn++) { |
| |
| switch (chn) { |
| case 0: |
| case 1: |
| case 2: |
| case 3: |
| case 4: |
| case 5: |
| case 6: |
| case 11: |
| case 14: |
| d1 = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
| 0x06, 2); |
| d2 = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
| 0x06, 2); |
| break; |
| case 8: |
| temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
| 0x06, 2); |
| d1 = temp + twl6032_get_trim_value(trim_regs, 7, 6, |
| 0x18, 0x1E, 1); |
| |
| temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3F, |
| 0x06, 2); |
| d2 = temp + twl6032_get_trim_value(trim_regs, 9, 7, |
| 0x1F, 0x06, 2); |
| break; |
| case 9: |
| temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
| 0x06, 2); |
| d1 = temp + twl6032_get_trim_value(trim_regs, 13, 11, |
| 0x18, 0x1E, 1); |
| |
| temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
| 0x06, 2); |
| d2 = temp + twl6032_get_trim_value(trim_regs, 15, 13, |
| 0x1F, 0x06, 1); |
| break; |
| case 10: |
| d1 = twl6032_get_trim_value(trim_regs, 10, 8, 0x0f, |
| 0x0E, 3); |
| d2 = twl6032_get_trim_value(trim_regs, 14, 12, 0x0f, |
| 0x0E, 3); |
| break; |
| case 7: |
| case 18: |
| temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
| 0x06, 2); |
| |
| d1 = (trim_regs[4] & 0x7E) >> 1; |
| if (trim_regs[4] & 0x01) |
| d1 = -d1; |
| d1 += temp; |
| |
| temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
| 0x06, 2); |
| |
| d2 = (trim_regs[5] & 0xFE) >> 1; |
| if (trim_regs[5] & 0x01) |
| d2 = -d2; |
| |
| d2 += temp; |
| break; |
| default: |
| /* No data for other channels */ |
| continue; |
| } |
| |
| twl6030_calibrate_channel(gpadc, chn, d1, d2); |
| } |
| |
| return 0; |
| } |
| |
| #define TWL6030_GPADC_CHAN(chn, _type, chan_info) { \ |
| .type = _type, \ |
| .channel = chn, \ |
| .info_mask_separate = BIT(chan_info), \ |
| .indexed = 1, \ |
| } |
| |
| static const struct iio_chan_spec twl6030_gpadc_iio_channels[] = { |
| TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| }; |
| |
| static const struct iio_chan_spec twl6032_gpadc_iio_channels[] = { |
| TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| TWL6030_GPADC_CHAN(17, IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
| TWL6030_GPADC_CHAN(18, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
| }; |
| |
| static const struct iio_info twl6030_gpadc_iio_info = { |
| .read_raw = &twl6030_gpadc_read_raw, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const struct twl6030_gpadc_platform_data twl6030_pdata = { |
| .iio_channels = twl6030_gpadc_iio_channels, |
| .nchannels = TWL6030_GPADC_USED_CHANNELS, |
| .ideal = twl6030_ideal, |
| .start_conversion = twl6030_start_conversion, |
| .channel_to_reg = twl6030_channel_to_reg, |
| .calibrate = twl6030_calibration, |
| }; |
| |
| static const struct twl6030_gpadc_platform_data twl6032_pdata = { |
| .iio_channels = twl6032_gpadc_iio_channels, |
| .nchannels = TWL6032_GPADC_USED_CHANNELS, |
| .ideal = twl6032_ideal, |
| .start_conversion = twl6032_start_conversion, |
| .channel_to_reg = twl6032_channel_to_reg, |
| .calibrate = twl6032_calibration, |
| }; |
| |
| static const struct of_device_id of_twl6030_match_tbl[] = { |
| { |
| .compatible = "ti,twl6030-gpadc", |
| .data = &twl6030_pdata, |
| }, |
| { |
| .compatible = "ti,twl6032-gpadc", |
| .data = &twl6032_pdata, |
| }, |
| { /* end */ } |
| }; |
| |
| static int twl6030_gpadc_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct twl6030_gpadc_data *gpadc; |
| const struct twl6030_gpadc_platform_data *pdata; |
| const struct of_device_id *match; |
| struct iio_dev *indio_dev; |
| int irq; |
| int ret; |
| |
| match = of_match_device(of_twl6030_match_tbl, dev); |
| if (!match) |
| return -EINVAL; |
| |
| pdata = match->data; |
| |
| indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc)); |
| if (!indio_dev) |
| return -ENOMEM; |
| |
| gpadc = iio_priv(indio_dev); |
| |
| gpadc->twl6030_cal_tbl = devm_kzalloc(dev, |
| sizeof(*gpadc->twl6030_cal_tbl) * |
| pdata->nchannels, GFP_KERNEL); |
| if (!gpadc->twl6030_cal_tbl) |
| return -ENOMEM; |
| |
| gpadc->dev = dev; |
| gpadc->pdata = pdata; |
| |
| platform_set_drvdata(pdev, indio_dev); |
| mutex_init(&gpadc->lock); |
| init_completion(&gpadc->irq_complete); |
| |
| ret = pdata->calibrate(gpadc); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "failed to read calibration registers\n"); |
| return ret; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, "failed to get irq\n"); |
| return irq; |
| } |
| |
| ret = devm_request_threaded_irq(dev, irq, NULL, |
| twl6030_gpadc_irq_handler, |
| IRQF_ONESHOT, "twl6030_gpadc", indio_dev); |
| |
| ret = twl6030_gpadc_enable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "failed to enable GPADC interrupt\n"); |
| return ret; |
| } |
| |
| ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS, |
| TWL6030_REG_TOGGLE1); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "failed to enable GPADC module\n"); |
| return ret; |
| } |
| |
| indio_dev->name = DRIVER_NAME; |
| indio_dev->dev.parent = dev; |
| indio_dev->info = &twl6030_gpadc_iio_info; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = pdata->iio_channels; |
| indio_dev->num_channels = pdata->nchannels; |
| |
| return iio_device_register(indio_dev); |
| } |
| |
| static int twl6030_gpadc_remove(struct platform_device *pdev) |
| { |
| struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| |
| twl6030_gpadc_disable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK); |
| iio_device_unregister(indio_dev); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int twl6030_gpadc_suspend(struct device *pdev) |
| { |
| int ret; |
| |
| ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCR, |
| TWL6030_REG_TOGGLE1); |
| if (ret) |
| dev_err(pdev, "error resetting GPADC (%d)!\n", ret); |
| |
| return 0; |
| }; |
| |
| static int twl6030_gpadc_resume(struct device *pdev) |
| { |
| int ret; |
| |
| ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS, |
| TWL6030_REG_TOGGLE1); |
| if (ret) |
| dev_err(pdev, "error setting GPADC (%d)!\n", ret); |
| |
| return 0; |
| }; |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(twl6030_gpadc_pm_ops, twl6030_gpadc_suspend, |
| twl6030_gpadc_resume); |
| |
| static struct platform_driver twl6030_gpadc_driver = { |
| .probe = twl6030_gpadc_probe, |
| .remove = twl6030_gpadc_remove, |
| .driver = { |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| .pm = &twl6030_gpadc_pm_ops, |
| .of_match_table = of_twl6030_match_tbl, |
| }, |
| }; |
| |
| module_platform_driver(twl6030_gpadc_driver); |
| |
| MODULE_ALIAS("platform: " DRIVER_NAME); |
| MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); |
| MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); |
| MODULE_AUTHOR("Oleksandr Kozaruk <oleksandr.kozaruk@ti.com"); |
| MODULE_DESCRIPTION("twl6030 ADC driver"); |
| MODULE_LICENSE("GPL"); |
