| /* |
| * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver |
| * |
| * Copyright 2010 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/gpio.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/delay.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "dac.h" |
| #include "ad5624r.h" |
| |
| /** |
| * struct ad5624r_state - device related storage |
| * @indio_dev: associated industrial IO device |
| * @us: spi device |
| **/ |
| struct ad5624r_state { |
| struct iio_dev *indio_dev; |
| struct spi_device *us; |
| int data_len; |
| int ldac_mode; |
| int dac_power_mode[AD5624R_DAC_CHANNELS]; |
| int internal_ref; |
| }; |
| |
| static int ad5624r_spi_write(struct spi_device *spi, |
| u8 cmd, u8 addr, u16 val, u8 len) |
| { |
| u32 data; |
| u8 msg[3]; |
| |
| /* |
| * The input shift register is 24 bits wide. The first two bits are don't care bits. |
| * The next three are the command bits, C2 to C0, followed by the 3-bit DAC address, |
| * A2 to A0, and then the 16-, 14-, 12-bit data-word. The data-word comprises the 16-, |
| * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, for the AD5664R, |
| * AD5644R, and AD5624R, respectively. |
| */ |
| data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len)); |
| msg[0] = data >> 16; |
| msg[1] = data >> 8; |
| msg[2] = data; |
| |
| return spi_write(spi, msg, 3); |
| } |
| |
| static ssize_t ad5624r_write_dac(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| long readin; |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| ret = strict_strtol(buf, 10, &readin); |
| if (ret) |
| return ret; |
| |
| ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, |
| this_attr->address, readin, st->data_len); |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5624r_read_ldac_mode(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| |
| return sprintf(buf, "%x\n", st->ldac_mode); |
| } |
| |
| static ssize_t ad5624r_write_ldac_mode(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| long readin; |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| |
| ret = strict_strtol(buf, 16, &readin); |
| if (ret) |
| return ret; |
| |
| ret = ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0, |
| readin & 0xF, 16); |
| st->ldac_mode = readin & 0xF; |
| |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5624r_read_dac_power_mode(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]); |
| } |
| |
| static ssize_t ad5624r_write_dac_power_mode(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| long readin; |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| ret = strict_strtol(buf, 10, &readin); |
| if (ret) |
| return ret; |
| |
| ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, |
| ((readin & 0x3) << 4) | |
| (1 << this_attr->address), 16); |
| |
| st->dac_power_mode[this_attr->address] = readin & 0x3; |
| |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5624r_read_internal_ref_mode(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| |
| return sprintf(buf, "%d\n", st->internal_ref); |
| } |
| |
| static ssize_t ad5624r_write_internal_ref_mode(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| long readin; |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5624r_state *st = indio_dev->dev_data; |
| |
| ret = strict_strtol(buf, 10, &readin); |
| if (ret) |
| return ret; |
| |
| ret = ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, |
| !!readin, 16); |
| |
| st->internal_ref = !!readin; |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0); |
| static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1); |
| static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2); |
| static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3); |
| |
| static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode, |
| ad5624r_write_ldac_mode, 0); |
| static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR, |
| ad5624r_read_internal_ref_mode, |
| ad5624r_write_internal_ref_mode, 0); |
| |
| #define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \ |
| IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr) |
| |
| static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode, |
| ad5624r_write_dac_power_mode, 0); |
| static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode, |
| ad5624r_write_dac_power_mode, 1); |
| static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode, |
| ad5624r_write_dac_power_mode, 2); |
| static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode, |
| ad5624r_write_dac_power_mode, 3); |
| |
| static struct attribute *ad5624r_attributes[] = { |
| &iio_dev_attr_out0_raw.dev_attr.attr, |
| &iio_dev_attr_out1_raw.dev_attr.attr, |
| &iio_dev_attr_out2_raw.dev_attr.attr, |
| &iio_dev_attr_out3_raw.dev_attr.attr, |
| &iio_dev_attr_dac_power_mode_0.dev_attr.attr, |
| &iio_dev_attr_dac_power_mode_1.dev_attr.attr, |
| &iio_dev_attr_dac_power_mode_2.dev_attr.attr, |
| &iio_dev_attr_dac_power_mode_3.dev_attr.attr, |
| &iio_dev_attr_ldac_mode.dev_attr.attr, |
| &iio_dev_attr_internal_ref.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ad5624r_attribute_group = { |
| .attrs = ad5624r_attributes, |
| }; |
| |
| static int __devinit ad5624r_probe(struct spi_device *spi) |
| { |
| struct ad5624r_state *st; |
| int ret = 0; |
| |
| st = kzalloc(sizeof(*st), GFP_KERNEL); |
| if (st == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| spi_set_drvdata(spi, st); |
| |
| st->data_len = spi_get_device_id(spi)->driver_data; |
| |
| st->us = spi; |
| st->indio_dev = iio_allocate_device(); |
| if (st->indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_free_st; |
| } |
| st->indio_dev->dev.parent = &spi->dev; |
| st->indio_dev->num_interrupt_lines = 0; |
| st->indio_dev->event_attrs = NULL; |
| |
| st->indio_dev->attrs = &ad5624r_attribute_group; |
| st->indio_dev->dev_data = (void *)(st); |
| st->indio_dev->driver_module = THIS_MODULE; |
| st->indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| ret = iio_device_register(st->indio_dev); |
| if (ret) |
| goto error_free_dev; |
| |
| spi->mode = SPI_MODE_0; |
| spi_setup(spi); |
| |
| return 0; |
| |
| error_free_dev: |
| iio_free_device(st->indio_dev); |
| error_free_st: |
| kfree(st); |
| error_ret: |
| return ret; |
| } |
| |
| static int __devexit ad5624r_remove(struct spi_device *spi) |
| { |
| struct ad5624r_state *st = spi_get_drvdata(spi); |
| |
| iio_device_unregister(st->indio_dev); |
| kfree(st); |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad5624r_id[] = { |
| {"ad5624r", 12}, |
| {"ad5644r", 14}, |
| {"ad5664r", 16}, |
| {} |
| }; |
| |
| static struct spi_driver ad5624r_driver = { |
| .driver = { |
| .name = "ad5624r", |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad5624r_probe, |
| .remove = __devexit_p(ad5624r_remove), |
| .id_table = ad5624r_id, |
| }; |
| |
| static __init int ad5624r_spi_init(void) |
| { |
| return spi_register_driver(&ad5624r_driver); |
| } |
| module_init(ad5624r_spi_init); |
| |
| static __exit void ad5624r_spi_exit(void) |
| { |
| spi_unregister_driver(&ad5624r_driver); |
| } |
| module_exit(ad5624r_spi_exit); |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver"); |
| MODULE_LICENSE("GPL v2"); |