Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 1 | /* |
Michael Hennerich | f22c1cf | 2011-09-02 17:25:37 +0100 | [diff] [blame] | 2 | * AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 3 | * |
Michael Hennerich | f22c1cf | 2011-09-02 17:25:37 +0100 | [diff] [blame] | 4 | * Copyright 2010-2011 Analog Devices Inc. |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 5 | * |
| 6 | * Licensed under the GPL-2 or later. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/interrupt.h> |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 10 | #include <linux/device.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/sysfs.h> |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 14 | #include <linux/i2c.h> |
Paul Gortmaker | 99c9785 | 2011-07-03 15:49:50 -0400 | [diff] [blame] | 15 | #include <linux/module.h> |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 16 | #include <linux/mutex.h> |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 17 | #include <linux/regulator/consumer.h> |
| 18 | #include <linux/err.h> |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 19 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 20 | #include <linux/iio/iio.h> |
| 21 | #include <linux/iio/sysfs.h> |
| 22 | #include <linux/iio/events.h> |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 23 | |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 24 | #include "ad7291.h" |
| 25 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 26 | /* |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 27 | * Simplified handling |
| 28 | * |
| 29 | * If no events enabled - single polled channel read |
| 30 | * If event enabled direct reads disable unless channel |
| 31 | * is in the read mask. |
| 32 | * |
| 33 | * The noise-delayed bit as per datasheet suggestion is always enabled. |
| 34 | * |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 35 | */ |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 36 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 37 | /* |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 38 | * AD7291 registers definition |
| 39 | */ |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 40 | #define AD7291_COMMAND 0x00 |
| 41 | #define AD7291_VOLTAGE 0x01 |
| 42 | #define AD7291_T_SENSE 0x02 |
| 43 | #define AD7291_T_AVERAGE 0x03 |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 44 | #define AD7291_DATA_HIGH(x) ((x) * 3 + 0x4) |
| 45 | #define AD7291_DATA_LOW(x) ((x) * 3 + 0x5) |
| 46 | #define AD7291_HYST(x) ((x) * 3 + 0x6) |
Michael Hennerich | 00feefb | 2011-09-02 17:25:38 +0100 | [diff] [blame] | 47 | #define AD7291_VOLTAGE_ALERT_STATUS 0x1F |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 48 | #define AD7291_T_ALERT_STATUS 0x20 |
| 49 | |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 50 | #define AD7291_VOLTAGE_LIMIT_COUNT 8 |
| 51 | |
| 52 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 53 | /* |
| 54 | * AD7291 command |
| 55 | */ |
Michael Hennerich | 00feefb | 2011-09-02 17:25:38 +0100 | [diff] [blame] | 56 | #define AD7291_AUTOCYCLE (1 << 0) |
| 57 | #define AD7291_RESET (1 << 1) |
| 58 | #define AD7291_ALERT_CLEAR (1 << 2) |
| 59 | #define AD7291_ALERT_POLARITY (1 << 3) |
| 60 | #define AD7291_EXT_REF (1 << 4) |
| 61 | #define AD7291_NOISE_DELAY (1 << 5) |
| 62 | #define AD7291_T_SENSE_MASK (1 << 7) |
| 63 | #define AD7291_VOLTAGE_MASK 0xFF00 |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 64 | #define AD7291_VOLTAGE_OFFSET 0x8 |
| 65 | |
| 66 | /* |
| 67 | * AD7291 value masks |
| 68 | */ |
Michael Hennerich | 00feefb | 2011-09-02 17:25:38 +0100 | [diff] [blame] | 69 | #define AD7291_CHANNEL_MASK 0xF000 |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 70 | #define AD7291_BITS 12 |
Michael Hennerich | 00feefb | 2011-09-02 17:25:38 +0100 | [diff] [blame] | 71 | #define AD7291_VALUE_MASK 0xFFF |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 72 | #define AD7291_T_VALUE_SIGN 0x400 |
| 73 | #define AD7291_T_VALUE_FLOAT_OFFSET 2 |
| 74 | #define AD7291_T_VALUE_FLOAT_MASK 0x2 |
| 75 | |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 76 | #define AD7291_BITS 12 |
| 77 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 78 | struct ad7291_chip_info { |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 79 | struct i2c_client *client; |
| 80 | struct regulator *reg; |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 81 | u16 command; |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 82 | u16 c_mask; /* Active voltage channels for events */ |
Michael Hennerich | e68b1db | 2011-09-02 17:25:45 +0100 | [diff] [blame] | 83 | struct mutex state_lock; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 84 | }; |
| 85 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 86 | static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data) |
| 87 | { |
| 88 | struct i2c_client *client = chip->client; |
| 89 | int ret = 0; |
| 90 | |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 91 | ret = i2c_smbus_read_word_swapped(client, reg); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 92 | if (ret < 0) { |
| 93 | dev_err(&client->dev, "I2C read error\n"); |
| 94 | return ret; |
| 95 | } |
| 96 | |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 97 | *data = ret; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data) |
| 103 | { |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 104 | return i2c_smbus_write_word_swapped(chip->client, reg, data); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 105 | } |
| 106 | |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 107 | static irqreturn_t ad7291_event_handler(int irq, void *private) |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 108 | { |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 109 | struct iio_dev *indio_dev = private; |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 110 | struct ad7291_chip_info *chip = iio_priv(private); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 111 | u16 t_status, v_status; |
| 112 | u16 command; |
| 113 | int i; |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 114 | s64 timestamp = iio_get_time_ns(); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 115 | |
| 116 | if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status)) |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 117 | return IRQ_HANDLED; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 118 | |
| 119 | if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status)) |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 120 | return IRQ_HANDLED; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 121 | |
| 122 | if (!(t_status || v_status)) |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 123 | return IRQ_HANDLED; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 124 | |
Michael Hennerich | f22c1cf | 2011-09-02 17:25:37 +0100 | [diff] [blame] | 125 | command = chip->command | AD7291_ALERT_CLEAR; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 126 | ad7291_i2c_write(chip, AD7291_COMMAND, command); |
| 127 | |
Michael Hennerich | f22c1cf | 2011-09-02 17:25:37 +0100 | [diff] [blame] | 128 | command = chip->command & ~AD7291_ALERT_CLEAR; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 129 | ad7291_i2c_write(chip, AD7291_COMMAND, command); |
| 130 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 131 | /* For now treat t_sense and t_sense_average the same */ |
| 132 | if ((t_status & (1 << 0)) || (t_status & (1 << 2))) |
Jonathan Cameron | 5aa9618 | 2011-08-30 12:41:06 +0100 | [diff] [blame] | 133 | iio_push_event(indio_dev, |
Jonathan Cameron | b206c3b | 2011-05-18 14:42:15 +0100 | [diff] [blame] | 134 | IIO_UNMOD_EVENT_CODE(IIO_TEMP, |
| 135 | 0, |
| 136 | IIO_EV_TYPE_THRESH, |
| 137 | IIO_EV_DIR_FALLING), |
| 138 | timestamp); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 139 | if ((t_status & (1 << 1)) || (t_status & (1 << 3))) |
Jonathan Cameron | 5aa9618 | 2011-08-30 12:41:06 +0100 | [diff] [blame] | 140 | iio_push_event(indio_dev, |
Jonathan Cameron | b206c3b | 2011-05-18 14:42:15 +0100 | [diff] [blame] | 141 | IIO_UNMOD_EVENT_CODE(IIO_TEMP, |
| 142 | 0, |
| 143 | IIO_EV_TYPE_THRESH, |
| 144 | IIO_EV_DIR_RISING), |
| 145 | timestamp); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 146 | |
Jonathan Cameron | b206c3b | 2011-05-18 14:42:15 +0100 | [diff] [blame] | 147 | for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i += 2) { |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 148 | if (v_status & (1 << i)) |
Jonathan Cameron | 5aa9618 | 2011-08-30 12:41:06 +0100 | [diff] [blame] | 149 | iio_push_event(indio_dev, |
Jonathan Cameron | 6835cb6 | 2011-09-27 09:56:41 +0100 | [diff] [blame] | 150 | IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, |
Jonathan Cameron | b206c3b | 2011-05-18 14:42:15 +0100 | [diff] [blame] | 151 | i/2, |
| 152 | IIO_EV_TYPE_THRESH, |
| 153 | IIO_EV_DIR_FALLING), |
| 154 | timestamp); |
| 155 | if (v_status & (1 << (i + 1))) |
Jonathan Cameron | 5aa9618 | 2011-08-30 12:41:06 +0100 | [diff] [blame] | 156 | iio_push_event(indio_dev, |
Jonathan Cameron | 6835cb6 | 2011-09-27 09:56:41 +0100 | [diff] [blame] | 157 | IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, |
Jonathan Cameron | b206c3b | 2011-05-18 14:42:15 +0100 | [diff] [blame] | 158 | i/2, |
| 159 | IIO_EV_TYPE_THRESH, |
| 160 | IIO_EV_DIR_RISING), |
| 161 | timestamp); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 162 | } |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 163 | |
| 164 | return IRQ_HANDLED; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 165 | } |
| 166 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 167 | static inline ssize_t ad7291_show_hyst(struct device *dev, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 168 | struct device_attribute *attr, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 169 | char *buf) |
| 170 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 171 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 172 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 173 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 174 | u16 data; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 175 | int ret; |
| 176 | |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 177 | ret = ad7291_i2c_read(chip, this_attr->address, &data); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 178 | if (ret < 0) |
| 179 | return ret; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 180 | |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 181 | return sprintf(buf, "%d\n", data & AD7291_VALUE_MASK); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 182 | } |
| 183 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 184 | static inline ssize_t ad7291_set_hyst(struct device *dev, |
| 185 | struct device_attribute *attr, |
| 186 | const char *buf, |
| 187 | size_t len) |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 188 | { |
Lars-Peter Clausen | 62c5183 | 2012-05-12 15:39:42 +0200 | [diff] [blame] | 189 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84f79ec | 2011-10-06 17:14:37 +0100 | [diff] [blame] | 190 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 191 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 192 | u16 data; |
| 193 | int ret; |
| 194 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 195 | ret = kstrtou16(buf, 10, &data); |
| 196 | |
| 197 | if (ret < 0) |
| 198 | return ret; |
Michael Hennerich | a3ef65d | 2011-09-02 17:25:46 +0100 | [diff] [blame] | 199 | if (data > AD7291_VALUE_MASK) |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 200 | return -EINVAL; |
| 201 | |
Michael Hennerich | a3ef65d | 2011-09-02 17:25:46 +0100 | [diff] [blame] | 202 | ret = ad7291_i2c_write(chip, this_attr->address, data); |
| 203 | if (ret < 0) |
| 204 | return ret; |
| 205 | |
| 206 | return len; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 207 | } |
| 208 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 209 | static IIO_DEVICE_ATTR(in_temp0_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 210 | S_IRUGO | S_IWUSR, |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 211 | ad7291_show_hyst, ad7291_set_hyst, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 212 | AD7291_HYST(8)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 213 | static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 214 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 215 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(0)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 216 | static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 217 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 218 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(1)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 219 | static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 220 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 221 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(2)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 222 | static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 223 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 224 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(3)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 225 | static IIO_DEVICE_ATTR(in_voltage4_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 226 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 227 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(4)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 228 | static IIO_DEVICE_ATTR(in_voltage5_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 229 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 230 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(5)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 231 | static IIO_DEVICE_ATTR(in_voltage6_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 232 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 233 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(6)); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 234 | static IIO_DEVICE_ATTR(in_voltage7_thresh_both_hyst_raw, |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 235 | S_IRUGO | S_IWUSR, |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 236 | ad7291_show_hyst, ad7291_set_hyst, AD7291_HYST(7)); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 237 | |
| 238 | static struct attribute *ad7291_event_attributes[] = { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 239 | &iio_dev_attr_in_temp0_thresh_both_hyst_raw.dev_attr.attr, |
| 240 | &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr, |
| 241 | &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr, |
| 242 | &iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr, |
| 243 | &iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr, |
| 244 | &iio_dev_attr_in_voltage4_thresh_both_hyst_raw.dev_attr.attr, |
| 245 | &iio_dev_attr_in_voltage5_thresh_both_hyst_raw.dev_attr.attr, |
| 246 | &iio_dev_attr_in_voltage6_thresh_both_hyst_raw.dev_attr.attr, |
| 247 | &iio_dev_attr_in_voltage7_thresh_both_hyst_raw.dev_attr.attr, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 248 | NULL, |
| 249 | }; |
| 250 | |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 251 | static unsigned int ad7291_threshold_reg(u64 event_code) |
| 252 | { |
| 253 | unsigned int offset; |
| 254 | |
| 255 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
| 256 | case IIO_VOLTAGE: |
| 257 | offset = IIO_EVENT_CODE_EXTRACT_CHAN(event_code); |
| 258 | break; |
| 259 | case IIO_TEMP: |
| 260 | offset = 8; |
| 261 | break; |
| 262 | default: |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_FALLING) |
| 267 | return AD7291_DATA_LOW(offset); |
| 268 | else |
| 269 | return AD7291_DATA_HIGH(offset); |
| 270 | } |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 271 | |
| 272 | static int ad7291_read_event_value(struct iio_dev *indio_dev, |
| 273 | u64 event_code, |
| 274 | int *val) |
| 275 | { |
| 276 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 277 | int ret; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 278 | u16 uval; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 279 | |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 280 | ret = ad7291_i2c_read(chip, ad7291_threshold_reg(event_code), &uval); |
| 281 | if (ret < 0) |
| 282 | return ret; |
| 283 | |
Michael Hennerich | b576590 | 2011-09-02 17:25:42 +0100 | [diff] [blame] | 284 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 285 | case IIO_VOLTAGE: |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 286 | *val = uval & AD7291_VALUE_MASK; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 287 | return 0; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 288 | case IIO_TEMP: |
Lars-Peter Clausen | 88198d2 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 289 | *val = sign_extend32(uval, 11); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 290 | return 0; |
| 291 | default: |
| 292 | return -EINVAL; |
| 293 | }; |
| 294 | } |
| 295 | |
| 296 | static int ad7291_write_event_value(struct iio_dev *indio_dev, |
| 297 | u64 event_code, |
| 298 | int val) |
| 299 | { |
| 300 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 301 | |
Michael Hennerich | b576590 | 2011-09-02 17:25:42 +0100 | [diff] [blame] | 302 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 303 | case IIO_VOLTAGE: |
Michael Hennerich | a3ef65d | 2011-09-02 17:25:46 +0100 | [diff] [blame] | 304 | if (val > AD7291_VALUE_MASK || val < 0) |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 305 | return -EINVAL; |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 306 | break; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 307 | case IIO_TEMP: |
| 308 | if (val > 2047 || val < -2048) |
| 309 | return -EINVAL; |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 310 | break; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 311 | default: |
| 312 | return -EINVAL; |
Lars-Peter Clausen | 3f8db0d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | return ad7291_i2c_write(chip, ad7291_threshold_reg(event_code), val); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | static int ad7291_read_event_config(struct iio_dev *indio_dev, |
| 319 | u64 event_code) |
| 320 | { |
| 321 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
| 322 | /* To be enabled the channel must simply be on. If any are enabled |
| 323 | we are in continuous sampling mode */ |
| 324 | |
Michael Hennerich | b576590 | 2011-09-02 17:25:42 +0100 | [diff] [blame] | 325 | switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 326 | case IIO_VOLTAGE: |
| 327 | if (chip->c_mask & |
Lars-Peter Clausen | da36716 | 2012-02-13 10:25:32 +0100 | [diff] [blame] | 328 | (1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN(event_code)))) |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 329 | return 1; |
| 330 | else |
| 331 | return 0; |
| 332 | case IIO_TEMP: |
| 333 | /* always on */ |
| 334 | return 1; |
| 335 | default: |
| 336 | return -EINVAL; |
| 337 | } |
| 338 | |
| 339 | } |
| 340 | |
| 341 | static int ad7291_write_event_config(struct iio_dev *indio_dev, |
| 342 | u64 event_code, |
| 343 | int state) |
| 344 | { |
| 345 | int ret = 0; |
| 346 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
| 347 | u16 regval; |
| 348 | |
| 349 | mutex_lock(&chip->state_lock); |
| 350 | regval = chip->command; |
| 351 | /* |
| 352 | * To be enabled the channel must simply be on. If any are enabled |
| 353 | * use continuous sampling mode. |
| 354 | * Possible to disable temp as well but that makes single read tricky. |
| 355 | */ |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 356 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 357 | switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) { |
| 358 | case IIO_VOLTAGE: |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 359 | if ((!state) && (chip->c_mask & (1 << (15 - |
Lars-Peter Clausen | da36716 | 2012-02-13 10:25:32 +0100 | [diff] [blame] | 360 | IIO_EVENT_CODE_EXTRACT_CHAN(event_code))))) |
| 361 | chip->c_mask &= ~(1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 362 | (event_code))); |
| 363 | else if (state && (!(chip->c_mask & (1 << (15 - |
Lars-Peter Clausen | da36716 | 2012-02-13 10:25:32 +0100 | [diff] [blame] | 364 | IIO_EVENT_CODE_EXTRACT_CHAN(event_code)))))) |
| 365 | chip->c_mask |= (1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 366 | (event_code))); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 367 | else |
| 368 | break; |
| 369 | |
Michael Hennerich | 81e2edb | 2011-09-02 17:25:40 +0100 | [diff] [blame] | 370 | regval &= ~AD7291_AUTOCYCLE; |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 371 | regval |= chip->c_mask; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 372 | if (chip->c_mask) /* Enable autocycle? */ |
| 373 | regval |= AD7291_AUTOCYCLE; |
| 374 | |
| 375 | ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval); |
| 376 | if (ret < 0) |
| 377 | goto error_ret; |
| 378 | |
| 379 | chip->command = regval; |
| 380 | break; |
| 381 | default: |
| 382 | ret = -EINVAL; |
| 383 | } |
| 384 | |
| 385 | error_ret: |
| 386 | mutex_unlock(&chip->state_lock); |
| 387 | return ret; |
| 388 | } |
| 389 | |
| 390 | static int ad7291_read_raw(struct iio_dev *indio_dev, |
| 391 | struct iio_chan_spec const *chan, |
| 392 | int *val, |
| 393 | int *val2, |
| 394 | long mask) |
| 395 | { |
| 396 | int ret; |
| 397 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
| 398 | u16 regval; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 399 | |
| 400 | switch (mask) { |
Jonathan Cameron | b11f98f | 2012-04-15 17:41:18 +0100 | [diff] [blame] | 401 | case IIO_CHAN_INFO_RAW: |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 402 | switch (chan->type) { |
| 403 | case IIO_VOLTAGE: |
| 404 | mutex_lock(&chip->state_lock); |
| 405 | /* If in autocycle mode drop through */ |
Michael Hennerich | 06420c2 | 2011-09-02 17:25:43 +0100 | [diff] [blame] | 406 | if (chip->command & AD7291_AUTOCYCLE) { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 407 | mutex_unlock(&chip->state_lock); |
| 408 | return -EBUSY; |
| 409 | } |
| 410 | /* Enable this channel alone */ |
| 411 | regval = chip->command & (~AD7291_VOLTAGE_MASK); |
Michael Hennerich | e70ab21 | 2011-09-02 17:25:36 +0100 | [diff] [blame] | 412 | regval |= 1 << (15 - chan->channel); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 413 | ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval); |
| 414 | if (ret < 0) { |
| 415 | mutex_unlock(&chip->state_lock); |
| 416 | return ret; |
| 417 | } |
| 418 | /* Read voltage */ |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 419 | ret = i2c_smbus_read_word_swapped(chip->client, |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 420 | AD7291_VOLTAGE); |
| 421 | if (ret < 0) { |
| 422 | mutex_unlock(&chip->state_lock); |
| 423 | return ret; |
| 424 | } |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 425 | *val = ret & AD7291_VALUE_MASK; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 426 | mutex_unlock(&chip->state_lock); |
| 427 | return IIO_VAL_INT; |
| 428 | case IIO_TEMP: |
| 429 | /* Assumes tsense bit of command register always set */ |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 430 | ret = i2c_smbus_read_word_swapped(chip->client, |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 431 | AD7291_T_SENSE); |
| 432 | if (ret < 0) |
| 433 | return ret; |
Lars-Peter Clausen | 88198d2 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 434 | *val = sign_extend32(ret, 11); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 435 | return IIO_VAL_INT; |
| 436 | default: |
| 437 | return -EINVAL; |
| 438 | } |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 439 | case IIO_CHAN_INFO_AVERAGE_RAW: |
Lars-Peter Clausen | 7bd49fe1 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 440 | ret = i2c_smbus_read_word_swapped(chip->client, |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 441 | AD7291_T_AVERAGE); |
| 442 | if (ret < 0) |
| 443 | return ret; |
Lars-Peter Clausen | 88198d2 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 444 | *val = sign_extend32(ret, 11); |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 445 | return IIO_VAL_INT; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 446 | case IIO_CHAN_INFO_SCALE: |
| 447 | switch (chan->type) { |
| 448 | case IIO_VOLTAGE: |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 449 | if (chip->reg) { |
| 450 | int vref; |
| 451 | vref = regulator_get_voltage(chip->reg); |
| 452 | if (vref < 0) |
| 453 | return vref; |
| 454 | *val = vref / 1000; |
| 455 | } else { |
| 456 | *val = 2500; |
| 457 | } |
Lars-Peter Clausen | 73a4445 | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 458 | *val2 = AD7291_BITS; |
| 459 | return IIO_VAL_FRACTIONAL_LOG2; |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 460 | case IIO_TEMP: |
| 461 | /* |
| 462 | * One LSB of the ADC corresponds to 0.25 deg C. |
| 463 | * The temperature reading is in 12-bit twos |
| 464 | * complement format |
| 465 | */ |
| 466 | *val = 250; |
| 467 | return IIO_VAL_INT; |
| 468 | default: |
| 469 | return -EINVAL; |
| 470 | } |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 471 | default: |
| 472 | return -EINVAL; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | #define AD7291_VOLTAGE_CHAN(_chan) \ |
| 477 | { \ |
| 478 | .type = IIO_VOLTAGE, \ |
Jonathan Cameron | 0325948 | 2013-02-27 19:37:16 +0000 | [diff] [blame] | 479 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 480 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 481 | .indexed = 1, \ |
| 482 | .channel = _chan, \ |
| 483 | .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)|\ |
| 484 | IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) \ |
| 485 | } |
| 486 | |
| 487 | static const struct iio_chan_spec ad7291_channels[] = { |
| 488 | AD7291_VOLTAGE_CHAN(0), |
| 489 | AD7291_VOLTAGE_CHAN(1), |
| 490 | AD7291_VOLTAGE_CHAN(2), |
| 491 | AD7291_VOLTAGE_CHAN(3), |
| 492 | AD7291_VOLTAGE_CHAN(4), |
| 493 | AD7291_VOLTAGE_CHAN(5), |
| 494 | AD7291_VOLTAGE_CHAN(6), |
| 495 | AD7291_VOLTAGE_CHAN(7), |
| 496 | { |
| 497 | .type = IIO_TEMP, |
Jonathan Cameron | 0325948 | 2013-02-27 19:37:16 +0000 | [diff] [blame] | 498 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
| 499 | BIT(IIO_CHAN_INFO_AVERAGE_RAW) | |
| 500 | BIT(IIO_CHAN_INFO_SCALE), |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 501 | .indexed = 1, |
| 502 | .channel = 0, |
| 503 | .event_mask = |
| 504 | IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)| |
| 505 | IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
| 506 | } |
| 507 | }; |
| 508 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 509 | static struct attribute_group ad7291_event_attribute_group = { |
| 510 | .attrs = ad7291_event_attributes, |
| 511 | }; |
| 512 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 513 | static const struct iio_info ad7291_info = { |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 514 | .read_raw = &ad7291_read_raw, |
| 515 | .read_event_config = &ad7291_read_event_config, |
| 516 | .write_event_config = &ad7291_write_event_config, |
| 517 | .read_event_value = &ad7291_read_event_value, |
| 518 | .write_event_value = &ad7291_write_event_value, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 519 | .event_attrs = &ad7291_event_attribute_group, |
Wei Yongjun | bb37796 | 2013-07-04 14:46:00 +0100 | [diff] [blame] | 520 | .driver_module = THIS_MODULE, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 521 | }; |
| 522 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 523 | static int ad7291_probe(struct i2c_client *client, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 524 | const struct i2c_device_id *id) |
| 525 | { |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 526 | struct ad7291_platform_data *pdata = client->dev.platform_data; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 527 | struct ad7291_chip_info *chip; |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 528 | struct iio_dev *indio_dev; |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 529 | int ret = 0; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 530 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 531 | indio_dev = iio_device_alloc(sizeof(*chip)); |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 532 | if (indio_dev == NULL) { |
| 533 | ret = -ENOMEM; |
| 534 | goto error_ret; |
| 535 | } |
Dan Carpenter | 03bda05 | 2011-06-29 22:50:48 +0300 | [diff] [blame] | 536 | chip = iio_priv(indio_dev); |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 537 | |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 538 | if (pdata && pdata->use_external_ref) { |
| 539 | chip->reg = regulator_get(&client->dev, "vref"); |
| 540 | if (IS_ERR(chip->reg)) |
| 541 | goto error_free; |
| 542 | |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 543 | ret = regulator_enable(chip->reg); |
| 544 | if (ret) |
| 545 | goto error_put_reg; |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 546 | } |
| 547 | |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 548 | mutex_init(&chip->state_lock); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 549 | /* this is only used for device removal purposes */ |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 550 | i2c_set_clientdata(client, indio_dev); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 551 | |
| 552 | chip->client = client; |
Michael Hennerich | c11f02e | 2011-09-02 17:25:44 +0100 | [diff] [blame] | 553 | |
| 554 | chip->command = AD7291_NOISE_DELAY | |
| 555 | AD7291_T_SENSE_MASK | /* Tsense always enabled */ |
| 556 | AD7291_ALERT_POLARITY; /* set irq polarity low level */ |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 557 | |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 558 | if (pdata && pdata->use_external_ref) |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 559 | chip->command |= AD7291_EXT_REF; |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 560 | |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 561 | indio_dev->name = id->name; |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 562 | indio_dev->channels = ad7291_channels; |
| 563 | indio_dev->num_channels = ARRAY_SIZE(ad7291_channels); |
| 564 | |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 565 | indio_dev->dev.parent = &client->dev; |
| 566 | indio_dev->info = &ad7291_info; |
| 567 | indio_dev->modes = INDIO_DIRECT_MODE; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 568 | |
Michael Hennerich | c11f02e | 2011-09-02 17:25:44 +0100 | [diff] [blame] | 569 | ret = ad7291_i2c_write(chip, AD7291_COMMAND, AD7291_RESET); |
| 570 | if (ret) { |
| 571 | ret = -EIO; |
| 572 | goto error_disable_reg; |
| 573 | } |
| 574 | |
| 575 | ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command); |
| 576 | if (ret) { |
| 577 | ret = -EIO; |
| 578 | goto error_disable_reg; |
| 579 | } |
| 580 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 581 | if (client->irq > 0) { |
Jonathan Cameron | 58c0323 | 2011-05-18 14:41:11 +0100 | [diff] [blame] | 582 | ret = request_threaded_irq(client->irq, |
| 583 | NULL, |
| 584 | &ad7291_event_handler, |
| 585 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
Jonathan Cameron | 845bd12 | 2011-05-18 14:41:44 +0100 | [diff] [blame] | 586 | id->name, |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 587 | indio_dev); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 588 | if (ret) |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 589 | goto error_disable_reg; |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 590 | } |
| 591 | |
Jonathan Cameron | 26d25ae | 2011-09-02 17:14:40 +0100 | [diff] [blame] | 592 | ret = iio_device_register(indio_dev); |
| 593 | if (ret) |
| 594 | goto error_unreg_irq; |
| 595 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 596 | return 0; |
| 597 | |
| 598 | error_unreg_irq: |
Jonathan Cameron | 4fd2424 | 2011-09-02 17:25:32 +0100 | [diff] [blame] | 599 | if (client->irq) |
| 600 | free_irq(client->irq, indio_dev); |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 601 | error_disable_reg: |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 602 | if (chip->reg) |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 603 | regulator_disable(chip->reg); |
| 604 | error_put_reg: |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 605 | if (chip->reg) |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 606 | regulator_put(chip->reg); |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 607 | error_free: |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 608 | iio_device_free(indio_dev); |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 609 | error_ret: |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 610 | return ret; |
| 611 | } |
| 612 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 613 | static int ad7291_remove(struct i2c_client *client) |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 614 | { |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 615 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 616 | struct ad7291_chip_info *chip = iio_priv(indio_dev); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 617 | |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 618 | iio_device_unregister(indio_dev); |
| 619 | |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 620 | if (client->irq) |
Jonathan Cameron | d439797 | 2011-06-27 13:07:23 +0100 | [diff] [blame] | 621 | free_irq(client->irq, indio_dev); |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 622 | |
Lars-Peter Clausen | 1df9d1d | 2013-06-14 16:58:00 +0100 | [diff] [blame] | 623 | if (chip->reg) { |
Michael Hennerich | 3b424f3 | 2011-09-02 17:25:39 +0100 | [diff] [blame] | 624 | regulator_disable(chip->reg); |
| 625 | regulator_put(chip->reg); |
| 626 | } |
| 627 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 628 | iio_device_free(indio_dev); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static const struct i2c_device_id ad7291_id[] = { |
| 634 | { "ad7291", 0 }, |
| 635 | {} |
| 636 | }; |
| 637 | |
| 638 | MODULE_DEVICE_TABLE(i2c, ad7291_id); |
| 639 | |
| 640 | static struct i2c_driver ad7291_driver = { |
| 641 | .driver = { |
Michael Hennerich | e68b1db | 2011-09-02 17:25:45 +0100 | [diff] [blame] | 642 | .name = KBUILD_MODNAME, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 643 | }, |
| 644 | .probe = ad7291_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 645 | .remove = ad7291_remove, |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 646 | .id_table = ad7291_id, |
| 647 | }; |
Lars-Peter Clausen | 6e5af18 | 2011-11-16 10:13:38 +0100 | [diff] [blame] | 648 | module_i2c_driver(ad7291_driver); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 649 | |
| 650 | MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); |
Michael Hennerich | e68b1db | 2011-09-02 17:25:45 +0100 | [diff] [blame] | 651 | MODULE_DESCRIPTION("Analog Devices AD7291 ADC driver"); |
Sonic Zhang | ddaecd5 | 2010-10-27 21:43:55 -0400 | [diff] [blame] | 652 | MODULE_LICENSE("GPL v2"); |