2 * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
4 * Copyright 2010-2011 Analog Devices Inc.
6 * Licensed under the GPL-2.
9 #include <linux/interrupt.h>
10 #include <linux/gpio.h>
12 #include <linux/device.h>
13 #include <linux/kernel.h>
14 #include <linux/spi/spi.h>
15 #include <linux/slab.h>
16 #include <linux/sysfs.h>
17 #include <linux/regulator/consumer.h>
24 static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
51 static int ad5624r_spi_write(struct spi_device *spi,
52 u8 cmd, u8 addr, u16 val, u8 len)
58 * The input shift register is 24 bits wide. The first two bits are
59 * don't care bits. The next three are the command bits, C2 to C0,
60 * followed by the 3-bit DAC address, A2 to A0, and then the
61 * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
62 * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
63 * for the AD5664R, AD5644R, and AD5624R, respectively.
65 data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
70 return spi_write(spi, msg, 3);
73 static ssize_t ad5624r_write_dac(struct device *dev,
74 struct device_attribute *attr,
75 const char *buf, size_t len)
79 struct iio_dev *indio_dev = dev_get_drvdata(dev);
80 struct ad5624r_state *st = iio_priv(indio_dev);
81 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
83 ret = strict_strtol(buf, 10, &readin);
87 ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
88 this_attr->address, readin,
90 return ret ? ret : len;
93 static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
94 struct device_attribute *attr, char *buf)
96 struct iio_dev *indio_dev = dev_get_drvdata(dev);
97 struct ad5624r_state *st = iio_priv(indio_dev);
99 char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
101 return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
104 static ssize_t ad5624r_write_powerdown_mode(struct device *dev,
105 struct device_attribute *attr,
106 const char *buf, size_t len)
108 struct iio_dev *indio_dev = dev_get_drvdata(dev);
109 struct ad5624r_state *st = iio_priv(indio_dev);
112 if (sysfs_streq(buf, "1kohm_to_gnd"))
113 st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
114 else if (sysfs_streq(buf, "100kohm_to_gnd"))
115 st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
116 else if (sysfs_streq(buf, "three_state"))
117 st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
121 return ret ? ret : len;
124 static ssize_t ad5624r_read_dac_powerdown(struct device *dev,
125 struct device_attribute *attr,
128 struct iio_dev *indio_dev = dev_get_drvdata(dev);
129 struct ad5624r_state *st = iio_priv(indio_dev);
130 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
132 return sprintf(buf, "%d\n",
133 !!(st->pwr_down_mask & (1 << this_attr->address)));
136 static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
137 struct device_attribute *attr,
138 const char *buf, size_t len)
142 struct iio_dev *indio_dev = dev_get_drvdata(dev);
143 struct ad5624r_state *st = iio_priv(indio_dev);
144 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
146 ret = strict_strtol(buf, 10, &readin);
151 st->pwr_down_mask |= (1 << this_attr->address);
153 st->pwr_down_mask &= ~(1 << this_attr->address);
157 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
158 (st->pwr_down_mode << 4) |
159 st->pwr_down_mask, 16);
161 return ret ? ret : len;
164 static ssize_t ad5624r_show_scale(struct device *dev,
165 struct device_attribute *attr,
168 struct iio_dev *indio_dev = dev_get_drvdata(dev);
169 struct ad5624r_state *st = iio_priv(indio_dev);
170 /* Corresponds to Vref / 2^(bits) */
171 unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
173 return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
175 static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);
177 static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
178 static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
179 static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
180 static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
182 static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
183 S_IWUSR, ad5624r_read_powerdown_mode,
184 ad5624r_write_powerdown_mode, 0);
186 static IIO_CONST_ATTR(out_powerdown_mode_available,
187 "1kohm_to_gnd 100kohm_to_gnd three_state");
189 #define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
190 IIO_DEVICE_ATTR(out##_num##_powerdown, \
191 S_IRUGO | S_IWUSR, _show, _store, _addr)
193 static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
194 ad5624r_write_dac_powerdown, 0);
195 static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
196 ad5624r_write_dac_powerdown, 1);
197 static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
198 ad5624r_write_dac_powerdown, 2);
199 static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
200 ad5624r_write_dac_powerdown, 3);
202 static struct attribute *ad5624r_attributes[] = {
203 &iio_dev_attr_out0_raw.dev_attr.attr,
204 &iio_dev_attr_out1_raw.dev_attr.attr,
205 &iio_dev_attr_out2_raw.dev_attr.attr,
206 &iio_dev_attr_out3_raw.dev_attr.attr,
207 &iio_dev_attr_out0_powerdown.dev_attr.attr,
208 &iio_dev_attr_out1_powerdown.dev_attr.attr,
209 &iio_dev_attr_out2_powerdown.dev_attr.attr,
210 &iio_dev_attr_out3_powerdown.dev_attr.attr,
211 &iio_dev_attr_out_powerdown_mode.dev_attr.attr,
212 &iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
213 &iio_dev_attr_out_scale.dev_attr.attr,
217 static const struct attribute_group ad5624r_attribute_group = {
218 .attrs = ad5624r_attributes,
221 static const struct iio_info ad5624r_info = {
222 .attrs = &ad5624r_attribute_group,
223 .driver_module = THIS_MODULE,
226 static int __devinit ad5624r_probe(struct spi_device *spi)
228 struct ad5624r_state *st;
229 struct iio_dev *indio_dev;
230 struct regulator *reg;
231 int ret, voltage_uv = 0;
233 reg = regulator_get(&spi->dev, "vcc");
235 ret = regulator_enable(reg);
239 voltage_uv = regulator_get_voltage(reg);
241 indio_dev = iio_allocate_device(sizeof(*st));
242 if (indio_dev == NULL) {
244 goto error_disable_reg;
246 st = iio_priv(indio_dev);
248 spi_set_drvdata(spi, indio_dev);
250 &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
253 st->vref_mv = voltage_uv / 1000;
255 st->vref_mv = st->chip_info->int_vref_mv;
259 indio_dev->dev.parent = &spi->dev;
260 indio_dev->name = spi_get_device_id(spi)->name;
261 indio_dev->info = &ad5624r_info;
262 indio_dev->modes = INDIO_DIRECT_MODE;
264 ret = iio_device_register(indio_dev);
268 ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
276 iio_free_device(indio_dev);
279 regulator_disable(reg);
287 static int __devexit ad5624r_remove(struct spi_device *spi)
289 struct iio_dev *indio_dev = spi_get_drvdata(spi);
290 struct ad5624r_state *st = iio_priv(indio_dev);
291 struct regulator *reg = st->reg;
293 iio_device_unregister(indio_dev);
295 regulator_disable(reg);
302 static const struct spi_device_id ad5624r_id[] = {
303 {"ad5624r3", ID_AD5624R3},
304 {"ad5644r3", ID_AD5644R3},
305 {"ad5664r3", ID_AD5664R3},
306 {"ad5624r5", ID_AD5624R5},
307 {"ad5644r5", ID_AD5644R5},
308 {"ad5664r5", ID_AD5664R5},
312 static struct spi_driver ad5624r_driver = {
315 .owner = THIS_MODULE,
317 .probe = ad5624r_probe,
318 .remove = __devexit_p(ad5624r_remove),
319 .id_table = ad5624r_id,
322 static __init int ad5624r_spi_init(void)
324 return spi_register_driver(&ad5624r_driver);
326 module_init(ad5624r_spi_init);
328 static __exit void ad5624r_spi_exit(void)
330 spi_unregister_driver(&ad5624r_driver);
332 module_exit(ad5624r_spi_exit);
334 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
335 MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
336 MODULE_LICENSE("GPL v2");