| /* |
| * AD7190 AD7192 AD7195 SPI ADC driver |
| * |
| * Copyright 2011 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/sysfs.h> |
| #include <linux/spi/spi.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/err.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "../buffer_generic.h" |
| #include "../ring_sw.h" |
| #include "../trigger.h" |
| #include "../trigger_consumer.h" |
| |
| #include "ad7192.h" |
| |
| /* Registers */ |
| #define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */ |
| #define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */ |
| #define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */ |
| #define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */ |
| #define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */ |
| #define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */ |
| #define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */ |
| #define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit |
| * (AD7792)/24-bit (AD7192)) */ |
| #define AD7192_REG_FULLSALE 7 /* Full-Scale Register |
| * (RW, 16-bit (AD7792)/24-bit (AD7192)) */ |
| |
| /* Communications Register Bit Designations (AD7192_REG_COMM) */ |
| #define AD7192_COMM_WEN (1 << 7) /* Write Enable */ |
| #define AD7192_COMM_WRITE (0 << 6) /* Write Operation */ |
| #define AD7192_COMM_READ (1 << 6) /* Read Operation */ |
| #define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ |
| #define AD7192_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */ |
| |
| /* Status Register Bit Designations (AD7192_REG_STAT) */ |
| #define AD7192_STAT_RDY (1 << 7) /* Ready */ |
| #define AD7192_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */ |
| #define AD7192_STAT_NOREF (1 << 5) /* Error no external reference */ |
| #define AD7192_STAT_PARITY (1 << 4) /* Parity */ |
| #define AD7192_STAT_CH3 (1 << 2) /* Channel 3 */ |
| #define AD7192_STAT_CH2 (1 << 1) /* Channel 2 */ |
| #define AD7192_STAT_CH1 (1 << 0) /* Channel 1 */ |
| |
| /* Mode Register Bit Designations (AD7192_REG_MODE) */ |
| #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */ |
| #define AD7192_MODE_DAT_STA (1 << 20) /* Status Register transmission */ |
| #define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */ |
| #define AD7192_MODE_SINC3 (1 << 15) /* SINC3 Filter Select */ |
| #define AD7192_MODE_ACX (1 << 14) /* AC excitation enable(AD7195 only)*/ |
| #define AD7192_MODE_ENPAR (1 << 13) /* Parity Enable */ |
| #define AD7192_MODE_CLKDIV (1 << 12) /* Clock divide by 2 (AD7190/2 only)*/ |
| #define AD7192_MODE_SCYCLE (1 << 11) /* Single cycle conversion */ |
| #define AD7192_MODE_REJ60 (1 << 10) /* 50/60Hz notch filter */ |
| #define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */ |
| |
| /* Mode Register: AD7192_MODE_SEL options */ |
| #define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */ |
| #define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */ |
| #define AD7192_MODE_IDLE 2 /* Idle Mode */ |
| #define AD7192_MODE_PWRDN 3 /* Power-Down Mode */ |
| #define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ |
| #define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ |
| #define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ |
| #define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ |
| |
| /* Mode Register: AD7192_MODE_CLKSRC options */ |
| #define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected |
| * from MCLK1 to MCLK2 */ |
| #define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */ |
| #define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not |
| * available at the MCLK2 pin */ |
| #define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available |
| * at the MCLK2 pin */ |
| |
| |
| /* Configuration Register Bit Designations (AD7192_REG_CONF) */ |
| |
| #define AD7192_CONF_CHOP (1 << 23) /* CHOP enable */ |
| #define AD7192_CONF_REFSEL (1 << 20) /* REFIN1/REFIN2 Reference Select */ |
| #define AD7192_CONF_CHAN(x) (((x) & 0xFF) << 8) /* Channel select */ |
| #define AD7192_CONF_BURN (1 << 7) /* Burnout current enable */ |
| #define AD7192_CONF_REFDET (1 << 6) /* Reference detect enable */ |
| #define AD7192_CONF_BUF (1 << 4) /* Buffered Mode Enable */ |
| #define AD7192_CONF_UNIPOLAR (1 << 3) /* Unipolar/Bipolar Enable */ |
| #define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */ |
| |
| #define AD7192_CH_AIN1P_AIN2M 0 /* AIN1(+) - AIN2(-) */ |
| #define AD7192_CH_AIN3P_AIN4M 1 /* AIN3(+) - AIN4(-) */ |
| #define AD7192_CH_TEMP 2 /* Temp Sensor */ |
| #define AD7192_CH_AIN2P_AIN2M 3 /* AIN2(+) - AIN2(-) */ |
| #define AD7192_CH_AIN1 4 /* AIN1 - AINCOM */ |
| #define AD7192_CH_AIN2 5 /* AIN2 - AINCOM */ |
| #define AD7192_CH_AIN3 6 /* AIN3 - AINCOM */ |
| #define AD7192_CH_AIN4 7 /* AIN4 - AINCOM */ |
| |
| /* ID Register Bit Designations (AD7192_REG_ID) */ |
| #define ID_AD7190 0x4 |
| #define ID_AD7192 0x0 |
| #define ID_AD7195 0x6 |
| #define AD7192_ID_MASK 0x0F |
| |
| /* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */ |
| #define AD7192_GPOCON_BPDSW (1 << 6) /* Bridge power-down switch enable */ |
| #define AD7192_GPOCON_GP32EN (1 << 5) /* Digital Output P3 and P2 enable */ |
| #define AD7192_GPOCON_GP10EN (1 << 4) /* Digital Output P1 and P0 enable */ |
| #define AD7192_GPOCON_P3DAT (1 << 3) /* P3 state */ |
| #define AD7192_GPOCON_P2DAT (1 << 2) /* P2 state */ |
| #define AD7192_GPOCON_P1DAT (1 << 1) /* P1 state */ |
| #define AD7192_GPOCON_P0DAT (1 << 0) /* P0 state */ |
| |
| #define AD7192_INT_FREQ_MHz 4915200 |
| |
| /* NOTE: |
| * The AD7190/2/5 features a dual use data out ready DOUT/RDY output. |
| * In order to avoid contentions on the SPI bus, it's therefore necessary |
| * to use spi bus locking. |
| * |
| * The DOUT/RDY output must also be wired to an interrupt capable GPIO. |
| */ |
| |
| struct ad7192_state { |
| struct spi_device *spi; |
| struct iio_trigger *trig; |
| struct regulator *reg; |
| struct ad7192_platform_data *pdata; |
| wait_queue_head_t wq_data_avail; |
| bool done; |
| bool irq_dis; |
| u16 int_vref_mv; |
| u32 mclk; |
| u32 f_order; |
| u32 mode; |
| u32 conf; |
| u32 scale_avail[8][2]; |
| long available_scan_masks[9]; |
| u8 gpocon; |
| u8 devid; |
| /* |
| * DMA (thus cache coherency maintenance) requires the |
| * transfer buffers to live in their own cache lines. |
| */ |
| u8 data[4] ____cacheline_aligned; |
| }; |
| |
| static int __ad7192_write_reg(struct ad7192_state *st, bool locked, |
| bool cs_change, unsigned char reg, |
| unsigned size, unsigned val) |
| { |
| u8 *data = st->data; |
| struct spi_transfer t = { |
| .tx_buf = data, |
| .len = size + 1, |
| .cs_change = cs_change, |
| }; |
| struct spi_message m; |
| |
| data[0] = AD7192_COMM_WRITE | AD7192_COMM_ADDR(reg); |
| |
| switch (size) { |
| case 3: |
| data[1] = val >> 16; |
| data[2] = val >> 8; |
| data[3] = val; |
| break; |
| case 2: |
| data[1] = val >> 8; |
| data[2] = val; |
| break; |
| case 1: |
| data[1] = val; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| |
| if (locked) |
| return spi_sync_locked(st->spi, &m); |
| else |
| return spi_sync(st->spi, &m); |
| } |
| |
| static int ad7192_write_reg(struct ad7192_state *st, |
| unsigned reg, unsigned size, unsigned val) |
| { |
| return __ad7192_write_reg(st, false, false, reg, size, val); |
| } |
| |
| static int __ad7192_read_reg(struct ad7192_state *st, bool locked, |
| bool cs_change, unsigned char reg, |
| int *val, unsigned size) |
| { |
| u8 *data = st->data; |
| int ret; |
| struct spi_transfer t[] = { |
| { |
| .tx_buf = data, |
| .len = 1, |
| }, { |
| .rx_buf = data, |
| .len = size, |
| .cs_change = cs_change, |
| }, |
| }; |
| struct spi_message m; |
| |
| data[0] = AD7192_COMM_READ | AD7192_COMM_ADDR(reg); |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t[0], &m); |
| spi_message_add_tail(&t[1], &m); |
| |
| if (locked) |
| ret = spi_sync_locked(st->spi, &m); |
| else |
| ret = spi_sync(st->spi, &m); |
| |
| if (ret < 0) |
| return ret; |
| |
| switch (size) { |
| case 3: |
| *val = data[0] << 16 | data[1] << 8 | data[2]; |
| break; |
| case 2: |
| *val = data[0] << 8 | data[1]; |
| break; |
| case 1: |
| *val = data[0]; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int ad7192_read_reg(struct ad7192_state *st, |
| unsigned reg, int *val, unsigned size) |
| { |
| return __ad7192_read_reg(st, 0, 0, reg, val, size); |
| } |
| |
| static int ad7192_read(struct ad7192_state *st, unsigned ch, |
| unsigned len, int *val) |
| { |
| int ret; |
| st->conf = (st->conf & ~AD7192_CONF_CHAN(-1)) | |
| AD7192_CONF_CHAN(1 << ch); |
| st->mode = (st->mode & ~AD7192_MODE_SEL(-1)) | |
| AD7192_MODE_SEL(AD7192_MODE_SINGLE); |
| |
| ad7192_write_reg(st, AD7192_REG_CONF, 3, st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| st->done = false; |
| |
| ret = __ad7192_write_reg(st, 1, 1, AD7192_REG_MODE, 3, st->mode); |
| if (ret < 0) |
| goto out; |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| ret = __ad7192_read_reg(st, 1, 0, AD7192_REG_DATA, val, len); |
| out: |
| spi_bus_unlock(st->spi->master); |
| |
| return ret; |
| } |
| |
| static int ad7192_calibrate(struct ad7192_state *st, unsigned mode, unsigned ch) |
| { |
| int ret; |
| |
| st->conf = (st->conf & ~AD7192_CONF_CHAN(-1)) | |
| AD7192_CONF_CHAN(1 << ch); |
| st->mode = (st->mode & ~AD7192_MODE_SEL(-1)) | AD7192_MODE_SEL(mode); |
| |
| ad7192_write_reg(st, AD7192_REG_CONF, 3, st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| st->done = false; |
| |
| ret = __ad7192_write_reg(st, 1, 1, AD7192_REG_MODE, 3, |
| (st->devid != ID_AD7195) ? |
| st->mode | AD7192_MODE_CLKDIV : |
| st->mode); |
| if (ret < 0) |
| goto out; |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| st->mode = (st->mode & ~AD7192_MODE_SEL(-1)) | |
| AD7192_MODE_SEL(AD7192_MODE_IDLE); |
| |
| ret = __ad7192_write_reg(st, 1, 0, AD7192_REG_MODE, 3, st->mode); |
| out: |
| spi_bus_unlock(st->spi->master); |
| |
| return ret; |
| } |
| |
| static const u8 ad7192_calib_arr[8][2] = { |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4} |
| }; |
| |
| static int ad7192_calibrate_all(struct ad7192_state *st) |
| { |
| int i, ret; |
| |
| for (i = 0; i < ARRAY_SIZE(ad7192_calib_arr); i++) { |
| ret = ad7192_calibrate(st, ad7192_calib_arr[i][0], |
| ad7192_calib_arr[i][1]); |
| if (ret) |
| goto out; |
| } |
| |
| return 0; |
| out: |
| dev_err(&st->spi->dev, "Calibration failed\n"); |
| return ret; |
| } |
| |
| static int ad7192_setup(struct ad7192_state *st) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(st->spi); |
| struct ad7192_platform_data *pdata = st->pdata; |
| unsigned long long scale_uv; |
| int i, ret, id; |
| u8 ones[6]; |
| |
| /* reset the serial interface */ |
| memset(&ones, 0xFF, 6); |
| ret = spi_write(st->spi, &ones, 6); |
| if (ret < 0) |
| goto out; |
| msleep(1); /* Wait for at least 500us */ |
| |
| /* write/read test for device presence */ |
| ret = ad7192_read_reg(st, AD7192_REG_ID, &id, 1); |
| if (ret) |
| goto out; |
| |
| id &= AD7192_ID_MASK; |
| |
| if (id != st->devid) |
| dev_warn(&st->spi->dev, "device ID query failed (0x%X)\n", id); |
| |
| switch (pdata->clock_source_sel) { |
| case AD7192_CLK_EXT_MCLK1_2: |
| case AD7192_CLK_EXT_MCLK2: |
| st->mclk = AD7192_INT_FREQ_MHz; |
| break; |
| case AD7192_CLK_INT: |
| case AD7192_CLK_INT_CO: |
| if (pdata->ext_clk_Hz) |
| st->mclk = pdata->ext_clk_Hz; |
| else |
| st->mclk = AD7192_INT_FREQ_MHz; |
| break; |
| default: |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) | |
| AD7192_MODE_CLKSRC(pdata->clock_source_sel) | |
| AD7192_MODE_RATE(480); |
| |
| st->conf = AD7192_CONF_GAIN(0); |
| |
| if (pdata->rej60_en) |
| st->mode |= AD7192_MODE_REJ60; |
| |
| if (pdata->sinc3_en) |
| st->mode |= AD7192_MODE_SINC3; |
| |
| if (pdata->refin2_en && (st->devid != ID_AD7195)) |
| st->conf |= AD7192_CONF_REFSEL; |
| |
| if (pdata->chop_en) { |
| st->conf |= AD7192_CONF_CHOP; |
| if (pdata->sinc3_en) |
| st->f_order = 3; /* SINC 3rd order */ |
| else |
| st->f_order = 4; /* SINC 4th order */ |
| } else { |
| st->f_order = 1; |
| } |
| |
| if (pdata->buf_en) |
| st->conf |= AD7192_CONF_BUF; |
| |
| if (pdata->unipolar_en) |
| st->conf |= AD7192_CONF_UNIPOLAR; |
| |
| if (pdata->burnout_curr_en) |
| st->conf |= AD7192_CONF_BURN; |
| |
| ret = ad7192_write_reg(st, AD7192_REG_MODE, 3, st->mode); |
| if (ret) |
| goto out; |
| |
| ret = ad7192_write_reg(st, AD7192_REG_CONF, 3, st->conf); |
| if (ret) |
| goto out; |
| |
| ret = ad7192_calibrate_all(st); |
| if (ret) |
| goto out; |
| |
| /* Populate available ADC input ranges */ |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { |
| scale_uv = ((u64)st->int_vref_mv * 100000000) |
| >> (indio_dev->channels[0].scan_type.realbits - |
| ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1)); |
| scale_uv >>= i; |
| |
| st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; |
| st->scale_avail[i][0] = scale_uv; |
| } |
| |
| return 0; |
| out: |
| dev_err(&st->spi->dev, "setup failed\n"); |
| return ret; |
| } |
| |
| static int ad7192_scan_from_ring(struct ad7192_state *st, unsigned ch, int *val) |
| { |
| struct iio_buffer *ring = iio_priv_to_dev(st)->buffer; |
| int ret; |
| s64 dat64[2]; |
| u32 *dat32 = (u32 *)dat64; |
| |
| if (!(test_bit(ch, ring->scan_mask))) |
| return -EBUSY; |
| |
| ret = ring->access->read_last(ring, (u8 *) &dat64); |
| if (ret) |
| return ret; |
| |
| *val = *dat32; |
| |
| return 0; |
| } |
| |
| static int ad7192_ring_preenable(struct iio_dev *indio_dev) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| struct iio_buffer *ring = indio_dev->buffer; |
| size_t d_size; |
| unsigned channel; |
| |
| if (!ring->scan_count) |
| return -EINVAL; |
| |
| channel = find_first_bit(ring->scan_mask, indio_dev->masklength); |
| |
| d_size = ring->scan_count * |
| indio_dev->channels[0].scan_type.storagebits / 8; |
| |
| if (ring->scan_timestamp) { |
| d_size += sizeof(s64); |
| |
| if (d_size % sizeof(s64)) |
| d_size += sizeof(s64) - (d_size % sizeof(s64)); |
| } |
| |
| if (indio_dev->buffer->access->set_bytes_per_datum) |
| indio_dev->buffer->access-> |
| set_bytes_per_datum(indio_dev->buffer, d_size); |
| |
| st->mode = (st->mode & ~AD7192_MODE_SEL(-1)) | |
| AD7192_MODE_SEL(AD7192_MODE_CONT); |
| st->conf = (st->conf & ~AD7192_CONF_CHAN(-1)) | |
| AD7192_CONF_CHAN(1 << indio_dev->channels[channel].address); |
| |
| ad7192_write_reg(st, AD7192_REG_CONF, 3, st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| __ad7192_write_reg(st, 1, 1, AD7192_REG_MODE, 3, st->mode); |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| |
| return 0; |
| } |
| |
| static int ad7192_ring_postdisable(struct iio_dev *indio_dev) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| st->mode = (st->mode & ~AD7192_MODE_SEL(-1)) | |
| AD7192_MODE_SEL(AD7192_MODE_IDLE); |
| |
| st->done = false; |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| if (!st->irq_dis) |
| disable_irq_nosync(st->spi->irq); |
| |
| __ad7192_write_reg(st, 1, 0, AD7192_REG_MODE, 3, st->mode); |
| |
| return spi_bus_unlock(st->spi->master); |
| } |
| |
| /** |
| * ad7192_trigger_handler() bh of trigger launched polling to ring buffer |
| **/ |
| static irqreturn_t ad7192_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct iio_buffer *ring = indio_dev->buffer; |
| struct ad7192_state *st = iio_priv(indio_dev); |
| s64 dat64[2]; |
| s32 *dat32 = (s32 *)dat64; |
| |
| if (ring->scan_count) |
| __ad7192_read_reg(st, 1, 1, AD7192_REG_DATA, |
| dat32, |
| indio_dev->channels[0].scan_type.realbits/8); |
| |
| /* Guaranteed to be aligned with 8 byte boundary */ |
| if (ring->scan_timestamp) |
| dat64[1] = pf->timestamp; |
| |
| ring->access->store_to(ring, (u8 *)dat64, pf->timestamp); |
| |
| iio_trigger_notify_done(indio_dev->trig); |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static const struct iio_buffer_setup_ops ad7192_ring_setup_ops = { |
| .preenable = &ad7192_ring_preenable, |
| .postenable = &iio_triggered_buffer_postenable, |
| .predisable = &iio_triggered_buffer_predisable, |
| .postdisable = &ad7192_ring_postdisable, |
| }; |
| |
| static int ad7192_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
| { |
| int ret; |
| |
| indio_dev->buffer = iio_sw_rb_allocate(indio_dev); |
| if (!indio_dev->buffer) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| /* Effectively select the ring buffer implementation */ |
| indio_dev->buffer->access = &ring_sw_access_funcs; |
| indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time, |
| &ad7192_trigger_handler, |
| IRQF_ONESHOT, |
| indio_dev, |
| "ad7192_consumer%d", |
| indio_dev->id); |
| if (indio_dev->pollfunc == NULL) { |
| ret = -ENOMEM; |
| goto error_deallocate_sw_rb; |
| } |
| |
| /* Ring buffer functions - here trigger setup related */ |
| indio_dev->buffer->setup_ops = &ad7192_ring_setup_ops; |
| |
| /* Flag that polled ring buffering is possible */ |
| indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
| return 0; |
| |
| error_deallocate_sw_rb: |
| iio_sw_rb_free(indio_dev->buffer); |
| error_ret: |
| return ret; |
| } |
| |
| static void ad7192_ring_cleanup(struct iio_dev *indio_dev) |
| { |
| iio_dealloc_pollfunc(indio_dev->pollfunc); |
| iio_sw_rb_free(indio_dev->buffer); |
| } |
| |
| /** |
| * ad7192_data_rdy_trig_poll() the event handler for the data rdy trig |
| **/ |
| static irqreturn_t ad7192_data_rdy_trig_poll(int irq, void *private) |
| { |
| struct ad7192_state *st = iio_priv(private); |
| |
| st->done = true; |
| wake_up_interruptible(&st->wq_data_avail); |
| disable_irq_nosync(irq); |
| st->irq_dis = true; |
| iio_trigger_poll(st->trig, iio_get_time_ns()); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int ad7192_probe_trigger(struct iio_dev *indio_dev) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| st->trig = iio_allocate_trigger("%s-dev%d", |
| spi_get_device_id(st->spi)->name, |
| indio_dev->id); |
| if (st->trig == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| ret = request_irq(st->spi->irq, |
| ad7192_data_rdy_trig_poll, |
| IRQF_TRIGGER_LOW, |
| spi_get_device_id(st->spi)->name, |
| indio_dev); |
| if (ret) |
| goto error_free_trig; |
| |
| disable_irq_nosync(st->spi->irq); |
| st->irq_dis = true; |
| st->trig->dev.parent = &st->spi->dev; |
| st->trig->owner = THIS_MODULE; |
| st->trig->private_data = indio_dev; |
| |
| ret = iio_trigger_register(st->trig); |
| |
| /* select default trigger */ |
| indio_dev->trig = st->trig; |
| if (ret) |
| goto error_free_irq; |
| |
| return 0; |
| |
| error_free_irq: |
| free_irq(st->spi->irq, indio_dev); |
| error_free_trig: |
| iio_free_trigger(st->trig); |
| error_ret: |
| return ret; |
| } |
| |
| static void ad7192_remove_trigger(struct iio_dev *indio_dev) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| iio_trigger_unregister(st->trig); |
| free_irq(st->spi->irq, indio_dev); |
| iio_free_trigger(st->trig); |
| } |
| |
| static ssize_t ad7192_read_frequency(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", st->mclk / |
| (st->f_order * 1024 * AD7192_MODE_RATE(st->mode))); |
| } |
| |
| static ssize_t ad7192_write_frequency(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| unsigned long lval; |
| int div, ret; |
| |
| ret = strict_strtoul(buf, 10, &lval); |
| if (ret) |
| return ret; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| div = st->mclk / (lval * st->f_order * 1024); |
| if (div < 1 || div > 1023) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| st->mode &= ~AD7192_MODE_RATE(-1); |
| st->mode |= AD7192_MODE_RATE(div); |
| ad7192_write_reg(st, AD7192_REG_MODE, 3, st->mode); |
| |
| out: |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, |
| ad7192_read_frequency, |
| ad7192_write_frequency); |
| |
| |
| static ssize_t ad7192_show_scale_available(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| int i, len = 0; |
| |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) |
| len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0], |
| st->scale_avail[i][1]); |
| |
| len += sprintf(buf + len, "\n"); |
| |
| return len; |
| } |
| |
| static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available, |
| in_voltage-voltage_scale_available, |
| S_IRUGO, ad7192_show_scale_available, NULL, 0); |
| |
| static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO, |
| ad7192_show_scale_available, NULL, 0); |
| |
| static ssize_t ad7192_show_ac_excitation(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX)); |
| } |
| |
| static ssize_t ad7192_show_bridge_switch(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW)); |
| } |
| |
| static ssize_t ad7192_set(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| bool val; |
| |
| ret = strtobool(buf, &val); |
| if (ret < 0) |
| return ret; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| switch (this_attr->address) { |
| case AD7192_REG_GPOCON: |
| if (val) |
| st->gpocon |= AD7192_GPOCON_BPDSW; |
| else |
| st->gpocon &= ~AD7192_GPOCON_BPDSW; |
| |
| ad7192_write_reg(st, AD7192_REG_GPOCON, 1, st->gpocon); |
| break; |
| case AD7192_REG_MODE: |
| if (val) |
| st->mode |= AD7192_MODE_ACX; |
| else |
| st->mode &= ~AD7192_MODE_ACX; |
| |
| ad7192_write_reg(st, AD7192_REG_GPOCON, 3, st->mode); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEVICE_ATTR(bridge_switch_en, S_IRUGO | S_IWUSR, |
| ad7192_show_bridge_switch, ad7192_set, |
| AD7192_REG_GPOCON); |
| |
| static IIO_DEVICE_ATTR(ac_excitation_en, S_IRUGO | S_IWUSR, |
| ad7192_show_ac_excitation, ad7192_set, |
| AD7192_REG_MODE); |
| |
| static struct attribute *ad7192_attributes[] = { |
| &iio_dev_attr_sampling_frequency.dev_attr.attr, |
| &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr, |
| &iio_dev_attr_in_voltage_scale_available.dev_attr.attr, |
| &iio_dev_attr_bridge_switch_en.dev_attr.attr, |
| &iio_dev_attr_ac_excitation_en.dev_attr.attr, |
| NULL |
| }; |
| |
| static mode_t ad7192_attr_is_visible(struct kobject *kobj, |
| struct attribute *attr, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| mode_t mode = attr->mode; |
| |
| if ((st->devid != ID_AD7195) && |
| (attr == &iio_dev_attr_ac_excitation_en.dev_attr.attr)) |
| mode = 0; |
| |
| return mode; |
| } |
| |
| static const struct attribute_group ad7192_attribute_group = { |
| .attrs = ad7192_attributes, |
| .is_visible = ad7192_attr_is_visible, |
| }; |
| |
| static int ad7192_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long m) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| int ret, smpl = 0; |
| bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR); |
| |
| switch (m) { |
| case 0: |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) |
| ret = ad7192_scan_from_ring(st, |
| chan->scan_index, &smpl); |
| else |
| ret = ad7192_read(st, chan->address, |
| chan->scan_type.realbits / 8, &smpl); |
| mutex_unlock(&indio_dev->mlock); |
| |
| if (ret < 0) |
| return ret; |
| |
| *val = (smpl >> chan->scan_type.shift) & |
| ((1 << (chan->scan_type.realbits)) - 1); |
| |
| switch (chan->type) { |
| case IIO_VOLTAGE: |
| if (!unipolar) |
| *val -= (1 << (chan->scan_type.realbits - 1)); |
| break; |
| case IIO_TEMP: |
| *val -= 0x800000; |
| *val /= 2815; /* temp Kelvin */ |
| *val -= 273; /* temp Celsius */ |
| break; |
| default: |
| return -EINVAL; |
| } |
| return IIO_VAL_INT; |
| |
| case (1 << IIO_CHAN_INFO_SCALE_SHARED): |
| mutex_lock(&indio_dev->mlock); |
| *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0]; |
| *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1]; |
| mutex_unlock(&indio_dev->mlock); |
| |
| return IIO_VAL_INT_PLUS_NANO; |
| |
| case (1 << IIO_CHAN_INFO_SCALE_SEPARATE): |
| *val = 1000; |
| |
| return IIO_VAL_INT; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int ad7192_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| int ret, i; |
| unsigned int tmp; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| switch (mask) { |
| case (1 << IIO_CHAN_INFO_SCALE_SHARED): |
| ret = -EINVAL; |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) |
| if (val2 == st->scale_avail[i][1]) { |
| tmp = st->conf; |
| st->conf &= ~AD7192_CONF_GAIN(-1); |
| st->conf |= AD7192_CONF_GAIN(i); |
| |
| if (tmp != st->conf) { |
| ad7192_write_reg(st, AD7192_REG_CONF, |
| 3, st->conf); |
| ad7192_calibrate_all(st); |
| } |
| ret = 0; |
| } |
| |
| default: |
| ret = -EINVAL; |
| } |
| |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret; |
| } |
| |
| static int ad7192_validate_trigger(struct iio_dev *indio_dev, |
| struct iio_trigger *trig) |
| { |
| if (indio_dev->trig != trig) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| long mask) |
| { |
| return IIO_VAL_INT_PLUS_NANO; |
| } |
| |
| static const struct iio_info ad7192_info = { |
| .read_raw = &ad7192_read_raw, |
| .write_raw = &ad7192_write_raw, |
| .write_raw_get_fmt = &ad7192_write_raw_get_fmt, |
| .attrs = &ad7192_attribute_group, |
| .validate_trigger = ad7192_validate_trigger, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| #define AD7192_CHAN_DIFF(_chan, _chan2, _name, _address, _si) \ |
| { .type = IIO_VOLTAGE, \ |
| .differential = 1, \ |
| .indexed = 1, \ |
| .extend_name = _name, \ |
| .channel = _chan, \ |
| .channel2 = _chan2, \ |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \ |
| .address = _address, \ |
| .scan_index = _si, \ |
| .scan_type = IIO_ST('s', 24, 32, 0)} |
| |
| #define AD7192_CHAN(_chan, _address, _si) \ |
| { .type = IIO_VOLTAGE, \ |
| .indexed = 1, \ |
| .channel = _chan, \ |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \ |
| .address = _address, \ |
| .scan_index = _si, \ |
| .scan_type = IIO_ST('s', 24, 32, 0)} |
| |
| #define AD7192_CHAN_TEMP(_chan, _address, _si) \ |
| { .type = IIO_TEMP, \ |
| .indexed = 1, \ |
| .channel = _chan, \ |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), \ |
| .address = _address, \ |
| .scan_index = _si, \ |
| .scan_type = IIO_ST('s', 24, 32, 0)} |
| |
| static struct iio_chan_spec ad7192_channels[] = { |
| AD7192_CHAN_DIFF(1, 2, NULL, AD7192_CH_AIN1P_AIN2M, 0), |
| AD7192_CHAN_DIFF(3, 4, NULL, AD7192_CH_AIN3P_AIN4M, 1), |
| AD7192_CHAN_TEMP(0, AD7192_CH_TEMP, 2), |
| AD7192_CHAN_DIFF(2, 2, "shorted", AD7192_CH_AIN2P_AIN2M, 3), |
| AD7192_CHAN(1, AD7192_CH_AIN1, 4), |
| AD7192_CHAN(2, AD7192_CH_AIN2, 5), |
| AD7192_CHAN(3, AD7192_CH_AIN3, 6), |
| AD7192_CHAN(4, AD7192_CH_AIN4, 7), |
| IIO_CHAN_SOFT_TIMESTAMP(8), |
| }; |
| |
| static int __devinit ad7192_probe(struct spi_device *spi) |
| { |
| struct ad7192_platform_data *pdata = spi->dev.platform_data; |
| struct ad7192_state *st; |
| struct iio_dev *indio_dev; |
| int ret, i , voltage_uv = 0; |
| |
| if (!pdata) { |
| dev_err(&spi->dev, "no platform data?\n"); |
| return -ENODEV; |
| } |
| |
| if (!spi->irq) { |
| dev_err(&spi->dev, "no IRQ?\n"); |
| return -ENODEV; |
| } |
| |
| indio_dev = iio_allocate_device(sizeof(*st)); |
| if (indio_dev == NULL) |
| return -ENOMEM; |
| |
| st = iio_priv(indio_dev); |
| |
| st->reg = regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(st->reg)) { |
| ret = regulator_enable(st->reg); |
| if (ret) |
| goto error_put_reg; |
| |
| voltage_uv = regulator_get_voltage(st->reg); |
| } |
| |
| st->pdata = pdata; |
| |
| if (pdata && pdata->vref_mv) |
| st->int_vref_mv = pdata->vref_mv; |
| else if (voltage_uv) |
| st->int_vref_mv = voltage_uv / 1000; |
| else |
| dev_warn(&spi->dev, "reference voltage undefined\n"); |
| |
| spi_set_drvdata(spi, indio_dev); |
| st->spi = spi; |
| st->devid = spi_get_device_id(spi)->driver_data; |
| indio_dev->dev.parent = &spi->dev; |
| indio_dev->name = spi_get_device_id(spi)->name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = ad7192_channels; |
| indio_dev->num_channels = ARRAY_SIZE(ad7192_channels); |
| indio_dev->available_scan_masks = st->available_scan_masks; |
| indio_dev->info = &ad7192_info; |
| |
| for (i = 0; i < indio_dev->num_channels; i++) |
| st->available_scan_masks[i] = (1 << i) | (1 << |
| indio_dev->channels[indio_dev->num_channels - 1]. |
| scan_index); |
| |
| init_waitqueue_head(&st->wq_data_avail); |
| |
| ret = ad7192_register_ring_funcs_and_init(indio_dev); |
| if (ret) |
| goto error_disable_reg; |
| |
| ret = ad7192_probe_trigger(indio_dev); |
| if (ret) |
| goto error_ring_cleanup; |
| |
| ret = iio_buffer_register(indio_dev, |
| indio_dev->channels, |
| indio_dev->num_channels); |
| if (ret) |
| goto error_remove_trigger; |
| |
| ret = ad7192_setup(st); |
| if (ret) |
| goto error_unreg_ring; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret < 0) |
| goto error_unreg_ring; |
| return 0; |
| |
| error_unreg_ring: |
| iio_buffer_unregister(indio_dev); |
| error_remove_trigger: |
| ad7192_remove_trigger(indio_dev); |
| error_ring_cleanup: |
| ad7192_ring_cleanup(indio_dev); |
| error_disable_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| error_put_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_put(st->reg); |
| |
| iio_free_device(indio_dev); |
| |
| return ret; |
| } |
| |
| static int ad7192_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| iio_buffer_unregister(indio_dev); |
| ad7192_remove_trigger(indio_dev); |
| ad7192_ring_cleanup(indio_dev); |
| |
| if (!IS_ERR(st->reg)) { |
| regulator_disable(st->reg); |
| regulator_put(st->reg); |
| } |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad7192_id[] = { |
| {"ad7190", ID_AD7190}, |
| {"ad7192", ID_AD7192}, |
| {"ad7195", ID_AD7195}, |
| {} |
| }; |
| |
| static struct spi_driver ad7192_driver = { |
| .driver = { |
| .name = "ad7192", |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad7192_probe, |
| .remove = __devexit_p(ad7192_remove), |
| .id_table = ad7192_id, |
| }; |
| |
| static int __init ad7192_init(void) |
| { |
| return spi_register_driver(&ad7192_driver); |
| } |
| module_init(ad7192_init); |
| |
| static void __exit ad7192_exit(void) |
| { |
| spi_unregister_driver(&ad7192_driver); |
| } |
| module_exit(ad7192_exit); |
| |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7195 ADC"); |
| MODULE_LICENSE("GPL v2"); |