dynamic_loader.rar_AD5744_AD5764

/* * AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog * Converter * * Copyright 2011 Analog Devices Inc. * * Licensed under the GPL-2. */ #include <linux/interrupt.h> #include <linux/fs.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/regulator/consumer.h> #include <linux/module.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/dac/ad5791.h> #define AD5791_RES_MASK(x) ((1 << (x)) - 1) #define AD5791_DAC_MASK AD5791_RES_MASK(20) #define AD5791_DAC_MSB (1 << 19) #define AD5791_CMD_READ (1 << 23) #define AD5791_CMD_WRITE (0 << 23) #define AD5791_ADDR(addr) ((addr) << 20) /* Registers */ #define AD5791_ADDR_NOOP 0 #define AD5791_ADDR_DAC0 1 #define AD5791_ADDR_CTRL 2 #define AD5791_ADDR_CLRCODE 3 #define AD5791_ADDR_SW_CTRL 4 /* Control Register */ #define AD5791_CTRL_RBUF (1 << 1) #define AD5791_CTRL_OPGND (1 << 2) #define AD5791_CTRL_DACTRI (1 << 3) #define AD5791_CTRL_BIN2SC (1 << 4) #define AD5791_CTRL_SDODIS (1 << 5) #define AD5761_CTRL_LINCOMP(x) ((x) << 6) #define AD5791_LINCOMP_0_10 0 #define AD5791_LINCOMP_10_12 1 #define AD5791_LINCOMP_12_16 2 #define AD5791_LINCOMP_16_19 3 #define AD5791_LINCOMP_19_20 12 #define AD5780_LINCOMP_0_10 0 #define AD5780_LINCOMP_10_20 12 /* Software Control Register */ #define AD5791_SWCTRL_LDAC (1 << 0) #define AD5791_SWCTRL_CLR (1 << 1) #define AD5791_SWCTRL_RESET (1 << 2) #define AD5791_DAC_PWRDN_6K 0 #define AD5791_DAC_PWRDN_3STATE 1 /** * struct ad5791_chip_info - chip specific information * @get_lin_comp: function pointer to the device specific function */ struct ad5791_chip_info { int (*get_lin_comp) (unsigned int span); }; /** * struct ad5791_state - driver instance specific data * @us: spi_device * @reg_vdd: positive supply regulator * @reg_vss: negative supply regulator * @chip_info: chip model specific constants * @vref_mv: actual reference voltage used * @vref_neg_mv: voltage of the negative supply * @pwr_down_mode current power down mode */ struct ad5791_state { struct spi_device *spi; struct regulator *reg_vdd; struct regulator *reg_vss; const struct ad5791_chip_info *chip_info; unsigned short vref_mv; unsigned int vref_neg_mv; unsigned ctrl; unsigned pwr_down_mode; bool pwr_down; }; /** * ad5791_supported_device_ids: */ enum ad5791_supported_device_ids { ID_AD5760, ID_AD5780, ID_AD5781, ID_AD5791, }; static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val) { union { u32 d32; u8 d8[4]; } data; data.d32 = cpu_to_be32(AD5791_CMD_WRITE | AD5791_ADDR(addr) | (val & AD5791_DAC_MASK)); return spi_write(spi, &data.d8[1], 3); } static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val) { union { u32 d32; u8 d8[4]; } data[3]; int ret; struct spi_transfer xfers[] = { { .tx_buf = &data[0].d8[1], .bits_per_word = 8, .len = 3, .cs_change = 1, }, { .tx_buf = &data[1].d8[1], .rx_buf = &data[2].d8[1], .bits_per_word = 8, .len = 3, }, }; data[0].d32 = cpu_to_be32(AD5791_CMD_READ | AD5791_ADDR(addr)); data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP)); ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers)); *val = be32_to_cpu(data[2].d32); return ret; } static const char * const ad5791_powerdown_modes[] = { "6kohm_to_gnd", "three_state", }; static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { struct ad5791_state *st = iio_priv(indio_dev); return st->pwr_down_mode; } static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, unsigned int mode) { struct ad5791_state *st = iio_priv(indio_dev); st->pwr_down_mode = mode; return 0; } static const struct iio_enum ad5791_powerdown_mode_enum = { .items = ad5791_powerdown_modes, .num_items = ARRAY_SIZE(ad5791_powerdown_modes), .get = ad5791_get_powerdown_mode, .set = ad5791_set_powerdown_mode, }; static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { struct ad5791_state *st = iio_priv(indio_dev); return sprintf(buf, "%d\n", st->pwr_down); } static ssize_t ad5791_write_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { bool pwr_down; int ret; struct ad5791_state *st = iio_priv(indio_dev); ret = strtobool(buf, &pwr_down); if (ret) return ret; if (!pwr_down) { st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); } else { if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K) st->ctrl |= AD5791_CTRL_OPGND; else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE) st->ctrl |= AD5791_CTRL_DACTRI; } st->pwr_down = pwr_down; ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl); return ret ? ret : len; } static int ad5791_get_lin_comp(unsigned int span) { if (span <= 10000) return AD5791_LINCOMP_0_10; else if (span <= 12000) return AD5791_LINCOMP_10_12; else if (span <= 16000) return AD5791_LINCOMP_12_16; else if (span <= 19000) return AD5791_LINCOMP_16_19; else return AD5791_LINCOMP_19_20; } static int ad5780_get_lin_comp(unsigned int span) { if (span <= 10000) return AD5780_LINCOMP_0_10; else return AD5780_LINCOMP_10_20; } static const struct ad5791_chip_info ad5791_chip_info_tbl[] = { [ID_AD5760] = { .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5780] = { .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5781] = { .get_lin_comp = ad5791_get_lin_comp, }, [ID_AD5791] = { .get_lin_comp = ad5791_get_lin_comp, }, }; static int ad5791_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { struct ad5791_state *st = iio_priv(indio_dev); u64 val64; int ret; switch (m) { case IIO_CHAN_INFO_RAW: ret = ad5791_spi_read(st->spi, chan->address, val); if (ret) return ret; *val &= AD5791_DAC_MASK; *val >>= chan->scan_type.shift; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = st->vref_mv; *val2 = (1 << chan->scan_type.realbits) - 1; return IIO_VAL_FRACTIONAL; case IIO_CHAN_INFO_OFFSET: val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits); do_div(val64, st->vref_mv); *val = -val64; return IIO_VAL_INT; default: return -EINVAL; } }; static const struct iio_chan_spec_ext_info ad5791_ext_info[] = { { .name = "powerdown", .shared = IIO_SHARED_BY_TYPE, .read = ad5791_read_dac_powerdown, .write = ad5791_write_dac_powerdown, }, IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5791_powerdown_mode_enum), IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum), { }, }; #define AD5791_CHAN(bits, shift) { \ .type = IIO_VOLTAGE, \ .output = 1, \ .indexed = 1, \ .address = AD5791_ADDR_DAC0, \ .channel = 0, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_OFFSET), \ .scan_type = IIO_ST('u', bits, 24, shift), \ .ext_info = ad5791_ext_info, \ } static const struct iio_chan_spec ad5791_channels[] = { [ID_AD5760] = AD5791_CHAN(16, 4), [ID_AD5780] = AD5791_CHAN(18, 2), [ID_AD5781] = AD5791_CHAN(18, 2), [ID_AD5791] = AD5791_CHAN(20, 0) }; static int ad5791_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct ad5791_state *st = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: val &= AD5791_RES_MASK(chan->scan_type.realbits); val <<= chan->scan_type.shift; return ad5791_spi_write(st->spi, chan->address, val); default: return -EINVAL; } } static const struct iio_info ad5791_info = { .read_raw = &ad5791_read_raw, .write_raw = &ad5791_write_raw, .driver_module = TH