136edc939SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2fa4c9c93SCrestez Dan Leonard /*
3fa4c9c93SCrestez Dan Leonard * hp206c.c - HOPERF HP206C precision barometer and altimeter sensor
4fa4c9c93SCrestez Dan Leonard *
5fa4c9c93SCrestez Dan Leonard * Copyright (c) 2016, Intel Corporation.
6fa4c9c93SCrestez Dan Leonard *
7fa4c9c93SCrestez Dan Leonard * (7-bit I2C slave address 0x76)
8fa4c9c93SCrestez Dan Leonard *
9fa4c9c93SCrestez Dan Leonard * Datasheet:
10fa4c9c93SCrestez Dan Leonard * http://www.hoperf.com/upload/sensor/HP206C_DataSheet_EN_V2.0.pdf
11fa4c9c93SCrestez Dan Leonard */
12fa4c9c93SCrestez Dan Leonard
13fa4c9c93SCrestez Dan Leonard #include <linux/module.h>
14*51feb3e3SJonathan Cameron #include <linux/mod_devicetable.h>
15fa4c9c93SCrestez Dan Leonard #include <linux/i2c.h>
16fa4c9c93SCrestez Dan Leonard #include <linux/iio/iio.h>
17fa4c9c93SCrestez Dan Leonard #include <linux/iio/sysfs.h>
18fa4c9c93SCrestez Dan Leonard #include <linux/delay.h>
19fa4c9c93SCrestez Dan Leonard #include <linux/util_macros.h>
20fa4c9c93SCrestez Dan Leonard
21b3ab0adbSAndy Shevchenko #include <asm/unaligned.h>
22b3ab0adbSAndy Shevchenko
23fa4c9c93SCrestez Dan Leonard /* I2C commands: */
24fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_SOFT_RST 0x06
25fa4c9c93SCrestez Dan Leonard
26fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT 0x40
27fa4c9c93SCrestez Dan Leonard
28fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_4096 0x00
29fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_2048 0x04
30fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_1024 0x08
31fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_512 0x0c
32fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_256 0x10
33fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_OSR_128 0x14
34fa4c9c93SCrestez Dan Leonard
35fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_CHNL_PT 0x00
36fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_ADC_CVT_CHNL_T 0x02
37fa4c9c93SCrestez Dan Leonard
38fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_READ_P 0x30
39fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_READ_T 0x32
40fa4c9c93SCrestez Dan Leonard
41fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_READ_REG 0x80
42fa4c9c93SCrestez Dan Leonard #define HP206C_CMD_WRITE_REG 0xc0
43fa4c9c93SCrestez Dan Leonard
44fa4c9c93SCrestez Dan Leonard #define HP206C_REG_INT_EN 0x0b
45fa4c9c93SCrestez Dan Leonard #define HP206C_REG_INT_CFG 0x0c
46fa4c9c93SCrestez Dan Leonard
47fa4c9c93SCrestez Dan Leonard #define HP206C_REG_INT_SRC 0x0d
48fa4c9c93SCrestez Dan Leonard #define HP206C_FLAG_DEV_RDY 0x40
49fa4c9c93SCrestez Dan Leonard
50fa4c9c93SCrestez Dan Leonard #define HP206C_REG_PARA 0x0f
51fa4c9c93SCrestez Dan Leonard #define HP206C_FLAG_CMPS_EN 0x80
52fa4c9c93SCrestez Dan Leonard
53fa4c9c93SCrestez Dan Leonard /* Maximum spin for DEV_RDY */
54fa4c9c93SCrestez Dan Leonard #define HP206C_MAX_DEV_RDY_WAIT_COUNT 20
55fa4c9c93SCrestez Dan Leonard #define HP206C_DEV_RDY_WAIT_US 20000
56fa4c9c93SCrestez Dan Leonard
57fa4c9c93SCrestez Dan Leonard struct hp206c_data {
58fa4c9c93SCrestez Dan Leonard struct mutex mutex;
59fa4c9c93SCrestez Dan Leonard struct i2c_client *client;
60fa4c9c93SCrestez Dan Leonard int temp_osr_index;
61fa4c9c93SCrestez Dan Leonard int pres_osr_index;
62fa4c9c93SCrestez Dan Leonard };
63fa4c9c93SCrestez Dan Leonard
64fa4c9c93SCrestez Dan Leonard struct hp206c_osr_setting {
65fa4c9c93SCrestez Dan Leonard u8 osr_mask;
66fa4c9c93SCrestez Dan Leonard unsigned int temp_conv_time_us;
67fa4c9c93SCrestez Dan Leonard unsigned int pres_conv_time_us;
68fa4c9c93SCrestez Dan Leonard };
69fa4c9c93SCrestez Dan Leonard
70fa4c9c93SCrestez Dan Leonard /* Data from Table 5 in datasheet. */
71fa4c9c93SCrestez Dan Leonard static const struct hp206c_osr_setting hp206c_osr_settings[] = {
72fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_4096, 65600, 131100 },
73fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_2048, 32800, 65600 },
74fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_1024, 16400, 32800 },
75fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_512, 8200, 16400 },
76fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_256, 4100, 8200 },
77fa4c9c93SCrestez Dan Leonard { HP206C_CMD_ADC_CVT_OSR_128, 2100, 4100 },
78fa4c9c93SCrestez Dan Leonard };
79fa4c9c93SCrestez Dan Leonard static const int hp206c_osr_rates[] = { 4096, 2048, 1024, 512, 256, 128 };
80fa4c9c93SCrestez Dan Leonard static const char hp206c_osr_rates_str[] = "4096 2048 1024 512 256 128";
81fa4c9c93SCrestez Dan Leonard
hp206c_read_reg(struct i2c_client * client,u8 reg)82fa4c9c93SCrestez Dan Leonard static inline int hp206c_read_reg(struct i2c_client *client, u8 reg)
83fa4c9c93SCrestez Dan Leonard {
84fa4c9c93SCrestez Dan Leonard return i2c_smbus_read_byte_data(client, HP206C_CMD_READ_REG | reg);
85fa4c9c93SCrestez Dan Leonard }
86fa4c9c93SCrestez Dan Leonard
hp206c_write_reg(struct i2c_client * client,u8 reg,u8 val)87fa4c9c93SCrestez Dan Leonard static inline int hp206c_write_reg(struct i2c_client *client, u8 reg, u8 val)
88fa4c9c93SCrestez Dan Leonard {
89fa4c9c93SCrestez Dan Leonard return i2c_smbus_write_byte_data(client,
90fa4c9c93SCrestez Dan Leonard HP206C_CMD_WRITE_REG | reg, val);
91fa4c9c93SCrestez Dan Leonard }
92fa4c9c93SCrestez Dan Leonard
hp206c_read_20bit(struct i2c_client * client,u8 cmd)93fa4c9c93SCrestez Dan Leonard static int hp206c_read_20bit(struct i2c_client *client, u8 cmd)
94fa4c9c93SCrestez Dan Leonard {
95fa4c9c93SCrestez Dan Leonard int ret;
96fa4c9c93SCrestez Dan Leonard u8 values[3];
97fa4c9c93SCrestez Dan Leonard
98b3ab0adbSAndy Shevchenko ret = i2c_smbus_read_i2c_block_data(client, cmd, sizeof(values), values);
99fa4c9c93SCrestez Dan Leonard if (ret < 0)
100fa4c9c93SCrestez Dan Leonard return ret;
101b3ab0adbSAndy Shevchenko if (ret != sizeof(values))
102fa4c9c93SCrestez Dan Leonard return -EIO;
103b3ab0adbSAndy Shevchenko return get_unaligned_be24(&values[0]) & GENMASK(19, 0);
104fa4c9c93SCrestez Dan Leonard }
105fa4c9c93SCrestez Dan Leonard
106fa4c9c93SCrestez Dan Leonard /* Spin for max 160ms until DEV_RDY is 1, or return error. */
hp206c_wait_dev_rdy(struct iio_dev * indio_dev)107fa4c9c93SCrestez Dan Leonard static int hp206c_wait_dev_rdy(struct iio_dev *indio_dev)
108fa4c9c93SCrestez Dan Leonard {
109fa4c9c93SCrestez Dan Leonard int ret;
110fa4c9c93SCrestez Dan Leonard int count = 0;
111fa4c9c93SCrestez Dan Leonard struct hp206c_data *data = iio_priv(indio_dev);
112fa4c9c93SCrestez Dan Leonard struct i2c_client *client = data->client;
113fa4c9c93SCrestez Dan Leonard
114fa4c9c93SCrestez Dan Leonard while (++count <= HP206C_MAX_DEV_RDY_WAIT_COUNT) {
115fa4c9c93SCrestez Dan Leonard ret = hp206c_read_reg(client, HP206C_REG_INT_SRC);
116fa4c9c93SCrestez Dan Leonard if (ret < 0) {
117fa4c9c93SCrestez Dan Leonard dev_err(&indio_dev->dev, "Failed READ_REG INT_SRC: %d\n", ret);
118fa4c9c93SCrestez Dan Leonard return ret;
119fa4c9c93SCrestez Dan Leonard }
120fa4c9c93SCrestez Dan Leonard if (ret & HP206C_FLAG_DEV_RDY)
121fa4c9c93SCrestez Dan Leonard return 0;
122fa4c9c93SCrestez Dan Leonard usleep_range(HP206C_DEV_RDY_WAIT_US, HP206C_DEV_RDY_WAIT_US * 3 / 2);
123fa4c9c93SCrestez Dan Leonard }
124fa4c9c93SCrestez Dan Leonard return -ETIMEDOUT;
125fa4c9c93SCrestez Dan Leonard }
126fa4c9c93SCrestez Dan Leonard
hp206c_set_compensation(struct i2c_client * client,bool enabled)127fa4c9c93SCrestez Dan Leonard static int hp206c_set_compensation(struct i2c_client *client, bool enabled)
128fa4c9c93SCrestez Dan Leonard {
129fa4c9c93SCrestez Dan Leonard int val;
130fa4c9c93SCrestez Dan Leonard
131fa4c9c93SCrestez Dan Leonard val = hp206c_read_reg(client, HP206C_REG_PARA);
132fa4c9c93SCrestez Dan Leonard if (val < 0)
133fa4c9c93SCrestez Dan Leonard return val;
134fa4c9c93SCrestez Dan Leonard if (enabled)
135fa4c9c93SCrestez Dan Leonard val |= HP206C_FLAG_CMPS_EN;
136fa4c9c93SCrestez Dan Leonard else
137fa4c9c93SCrestez Dan Leonard val &= ~HP206C_FLAG_CMPS_EN;
138fa4c9c93SCrestez Dan Leonard
139fa4c9c93SCrestez Dan Leonard return hp206c_write_reg(client, HP206C_REG_PARA, val);
140fa4c9c93SCrestez Dan Leonard }
141fa4c9c93SCrestez Dan Leonard
142fa4c9c93SCrestez Dan Leonard /* Do a soft reset */
hp206c_soft_reset(struct iio_dev * indio_dev)143fa4c9c93SCrestez Dan Leonard static int hp206c_soft_reset(struct iio_dev *indio_dev)
144fa4c9c93SCrestez Dan Leonard {
145fa4c9c93SCrestez Dan Leonard int ret;
146fa4c9c93SCrestez Dan Leonard struct hp206c_data *data = iio_priv(indio_dev);
147fa4c9c93SCrestez Dan Leonard struct i2c_client *client = data->client;
148fa4c9c93SCrestez Dan Leonard
149fa4c9c93SCrestez Dan Leonard ret = i2c_smbus_write_byte(client, HP206C_CMD_SOFT_RST);
150fa4c9c93SCrestez Dan Leonard if (ret) {
151fa4c9c93SCrestez Dan Leonard dev_err(&client->dev, "Failed to reset device: %d\n", ret);
152fa4c9c93SCrestez Dan Leonard return ret;
153fa4c9c93SCrestez Dan Leonard }
154fa4c9c93SCrestez Dan Leonard
155fa4c9c93SCrestez Dan Leonard usleep_range(400, 600);
156fa4c9c93SCrestez Dan Leonard
157fa4c9c93SCrestez Dan Leonard ret = hp206c_wait_dev_rdy(indio_dev);
158fa4c9c93SCrestez Dan Leonard if (ret) {
159fa4c9c93SCrestez Dan Leonard dev_err(&client->dev, "Device not ready after soft reset: %d\n", ret);
160fa4c9c93SCrestez Dan Leonard return ret;
161fa4c9c93SCrestez Dan Leonard }
162fa4c9c93SCrestez Dan Leonard
163fa4c9c93SCrestez Dan Leonard ret = hp206c_set_compensation(client, true);
164fa4c9c93SCrestez Dan Leonard if (ret)
165fa4c9c93SCrestez Dan Leonard dev_err(&client->dev, "Failed to enable compensation: %d\n", ret);
166fa4c9c93SCrestez Dan Leonard return ret;
167fa4c9c93SCrestez Dan Leonard }
168fa4c9c93SCrestez Dan Leonard
hp206c_conv_and_read(struct iio_dev * indio_dev,u8 conv_cmd,u8 read_cmd,unsigned int sleep_us)169fa4c9c93SCrestez Dan Leonard static int hp206c_conv_and_read(struct iio_dev *indio_dev,
170fa4c9c93SCrestez Dan Leonard u8 conv_cmd, u8 read_cmd,
171fa4c9c93SCrestez Dan Leonard unsigned int sleep_us)
172fa4c9c93SCrestez Dan Leonard {
173fa4c9c93SCrestez Dan Leonard int ret;
174fa4c9c93SCrestez Dan Leonard struct hp206c_data *data = iio_priv(indio_dev);
175fa4c9c93SCrestez Dan Leonard struct i2c_client *client = data->client;
176fa4c9c93SCrestez Dan Leonard
177fa4c9c93SCrestez Dan Leonard ret = hp206c_wait_dev_rdy(indio_dev);
178fa4c9c93SCrestez Dan Leonard if (ret < 0) {
179fa4c9c93SCrestez Dan Leonard dev_err(&indio_dev->dev, "Device not ready: %d\n", ret);
180fa4c9c93SCrestez Dan Leonard return ret;
181fa4c9c93SCrestez Dan Leonard }
182fa4c9c93SCrestez Dan Leonard
183fa4c9c93SCrestez Dan Leonard ret = i2c_smbus_write_byte(client, conv_cmd);
184fa4c9c93SCrestez Dan Leonard if (ret < 0) {
185fa4c9c93SCrestez Dan Leonard dev_err(&indio_dev->dev, "Failed convert: %d\n", ret);
186fa4c9c93SCrestez Dan Leonard return ret;
187fa4c9c93SCrestez Dan Leonard }
188fa4c9c93SCrestez Dan Leonard
189fa4c9c93SCrestez Dan Leonard usleep_range(sleep_us, sleep_us * 3 / 2);
190fa4c9c93SCrestez Dan Leonard
191fa4c9c93SCrestez Dan Leonard ret = hp206c_wait_dev_rdy(indio_dev);
192fa4c9c93SCrestez Dan Leonard if (ret < 0) {
193fa4c9c93SCrestez Dan Leonard dev_err(&indio_dev->dev, "Device not ready: %d\n", ret);
194fa4c9c93SCrestez Dan Leonard return ret;
195fa4c9c93SCrestez Dan Leonard }
196fa4c9c93SCrestez Dan Leonard
197fa4c9c93SCrestez Dan Leonard ret = hp206c_read_20bit(client, read_cmd);
198fa4c9c93SCrestez Dan Leonard if (ret < 0)
199fa4c9c93SCrestez Dan Leonard dev_err(&indio_dev->dev, "Failed read: %d\n", ret);
200fa4c9c93SCrestez Dan Leonard
201fa4c9c93SCrestez Dan Leonard return ret;
202fa4c9c93SCrestez Dan Leonard }
203fa4c9c93SCrestez Dan Leonard
hp206c_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)204fa4c9c93SCrestez Dan Leonard static int hp206c_read_raw(struct iio_dev *indio_dev,
205fa4c9c93SCrestez Dan Leonard struct iio_chan_spec const *chan, int *val,
206fa4c9c93SCrestez Dan Leonard int *val2, long mask)
207fa4c9c93SCrestez Dan Leonard {
208fa4c9c93SCrestez Dan Leonard int ret;
209fa4c9c93SCrestez Dan Leonard struct hp206c_data *data = iio_priv(indio_dev);
210fa4c9c93SCrestez Dan Leonard const struct hp206c_osr_setting *osr_setting;
211fa4c9c93SCrestez Dan Leonard u8 conv_cmd;
212fa4c9c93SCrestez Dan Leonard
213fa4c9c93SCrestez Dan Leonard mutex_lock(&data->mutex);
214fa4c9c93SCrestez Dan Leonard
215fa4c9c93SCrestez Dan Leonard switch (mask) {
216fa4c9c93SCrestez Dan Leonard case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
217fa4c9c93SCrestez Dan Leonard switch (chan->type) {
218fa4c9c93SCrestez Dan Leonard case IIO_TEMP:
219fa4c9c93SCrestez Dan Leonard *val = hp206c_osr_rates[data->temp_osr_index];
220fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT;
221fa4c9c93SCrestez Dan Leonard break;
222fa4c9c93SCrestez Dan Leonard
223fa4c9c93SCrestez Dan Leonard case IIO_PRESSURE:
224fa4c9c93SCrestez Dan Leonard *val = hp206c_osr_rates[data->pres_osr_index];
225fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT;
226fa4c9c93SCrestez Dan Leonard break;
227fa4c9c93SCrestez Dan Leonard default:
228fa4c9c93SCrestez Dan Leonard ret = -EINVAL;
229fa4c9c93SCrestez Dan Leonard }
230fa4c9c93SCrestez Dan Leonard break;
231fa4c9c93SCrestez Dan Leonard
232fa4c9c93SCrestez Dan Leonard case IIO_CHAN_INFO_RAW:
233fa4c9c93SCrestez Dan Leonard switch (chan->type) {
234fa4c9c93SCrestez Dan Leonard case IIO_TEMP:
235fa4c9c93SCrestez Dan Leonard osr_setting = &hp206c_osr_settings[data->temp_osr_index];
236fa4c9c93SCrestez Dan Leonard conv_cmd = HP206C_CMD_ADC_CVT |
237fa4c9c93SCrestez Dan Leonard osr_setting->osr_mask |
238fa4c9c93SCrestez Dan Leonard HP206C_CMD_ADC_CVT_CHNL_T;
239fa4c9c93SCrestez Dan Leonard ret = hp206c_conv_and_read(indio_dev,
240fa4c9c93SCrestez Dan Leonard conv_cmd,
241fa4c9c93SCrestez Dan Leonard HP206C_CMD_READ_T,
242fa4c9c93SCrestez Dan Leonard osr_setting->temp_conv_time_us);
243fa4c9c93SCrestez Dan Leonard if (ret >= 0) {
244fa4c9c93SCrestez Dan Leonard /* 20 significant bits are provided.
245fa4c9c93SCrestez Dan Leonard * Extend sign over the rest.
246fa4c9c93SCrestez Dan Leonard */
247fa4c9c93SCrestez Dan Leonard *val = sign_extend32(ret, 19);
248fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT;
249fa4c9c93SCrestez Dan Leonard }
250fa4c9c93SCrestez Dan Leonard break;
251fa4c9c93SCrestez Dan Leonard
252fa4c9c93SCrestez Dan Leonard case IIO_PRESSURE:
253fa4c9c93SCrestez Dan Leonard osr_setting = &hp206c_osr_settings[data->pres_osr_index];
254fa4c9c93SCrestez Dan Leonard conv_cmd = HP206C_CMD_ADC_CVT |
255fa4c9c93SCrestez Dan Leonard osr_setting->osr_mask |
256fa4c9c93SCrestez Dan Leonard HP206C_CMD_ADC_CVT_CHNL_PT;
257fa4c9c93SCrestez Dan Leonard ret = hp206c_conv_and_read(indio_dev,
258fa4c9c93SCrestez Dan Leonard conv_cmd,
259fa4c9c93SCrestez Dan Leonard HP206C_CMD_READ_P,
260fa4c9c93SCrestez Dan Leonard osr_setting->pres_conv_time_us);
261fa4c9c93SCrestez Dan Leonard if (ret >= 0) {
262fa4c9c93SCrestez Dan Leonard *val = ret;
263fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT;
264fa4c9c93SCrestez Dan Leonard }
265fa4c9c93SCrestez Dan Leonard break;
266fa4c9c93SCrestez Dan Leonard default:
267fa4c9c93SCrestez Dan Leonard ret = -EINVAL;
268fa4c9c93SCrestez Dan Leonard }
269fa4c9c93SCrestez Dan Leonard break;
270fa4c9c93SCrestez Dan Leonard
271fa4c9c93SCrestez Dan Leonard case IIO_CHAN_INFO_SCALE:
272fa4c9c93SCrestez Dan Leonard switch (chan->type) {
273fa4c9c93SCrestez Dan Leonard case IIO_TEMP:
274fa4c9c93SCrestez Dan Leonard *val = 0;
275fa4c9c93SCrestez Dan Leonard *val2 = 10000;
276fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT_PLUS_MICRO;
277fa4c9c93SCrestez Dan Leonard break;
278fa4c9c93SCrestez Dan Leonard
279fa4c9c93SCrestez Dan Leonard case IIO_PRESSURE:
280fa4c9c93SCrestez Dan Leonard *val = 0;
281fa4c9c93SCrestez Dan Leonard *val2 = 1000;
282fa4c9c93SCrestez Dan Leonard ret = IIO_VAL_INT_PLUS_MICRO;
283fa4c9c93SCrestez Dan Leonard break;
284fa4c9c93SCrestez Dan Leonard default:
285fa4c9c93SCrestez Dan Leonard ret = -EINVAL;
286fa4c9c93SCrestez Dan Leonard }
287fa4c9c93SCrestez Dan Leonard break;
288fa4c9c93SCrestez Dan Leonard
289fa4c9c93SCrestez Dan Leonard default:
290fa4c9c93SCrestez Dan Leonard ret = -EINVAL;
291fa4c9c93SCrestez Dan Leonard }
292fa4c9c93SCrestez Dan Leonard
293fa4c9c93SCrestez Dan Leonard mutex_unlock(&data->mutex);
294fa4c9c93SCrestez Dan Leonard return ret;
295fa4c9c93SCrestez Dan Leonard }
296fa4c9c93SCrestez Dan Leonard
hp206c_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)297fa4c9c93SCrestez Dan Leonard static int hp206c_write_raw(struct iio_dev *indio_dev,
298fa4c9c93SCrestez Dan Leonard struct iio_chan_spec const *chan,
299fa4c9c93SCrestez Dan Leonard int val, int val2, long mask)
300fa4c9c93SCrestez Dan Leonard {
301fa4c9c93SCrestez Dan Leonard int ret = 0;
302fa4c9c93SCrestez Dan Leonard struct hp206c_data *data = iio_priv(indio_dev);
303fa4c9c93SCrestez Dan Leonard
304fa4c9c93SCrestez Dan Leonard if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO)
305fa4c9c93SCrestez Dan Leonard return -EINVAL;
306fa4c9c93SCrestez Dan Leonard mutex_lock(&data->mutex);
307fa4c9c93SCrestez Dan Leonard switch (chan->type) {
308fa4c9c93SCrestez Dan Leonard case IIO_TEMP:
309fa4c9c93SCrestez Dan Leonard data->temp_osr_index = find_closest_descending(val,
310fa4c9c93SCrestez Dan Leonard hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates));
311fa4c9c93SCrestez Dan Leonard break;
312fa4c9c93SCrestez Dan Leonard case IIO_PRESSURE:
313fa4c9c93SCrestez Dan Leonard data->pres_osr_index = find_closest_descending(val,
314fa4c9c93SCrestez Dan Leonard hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates));
315fa4c9c93SCrestez Dan Leonard break;
316fa4c9c93SCrestez Dan Leonard default:
317fa4c9c93SCrestez Dan Leonard ret = -EINVAL;
318fa4c9c93SCrestez Dan Leonard }
319fa4c9c93SCrestez Dan Leonard mutex_unlock(&data->mutex);
320fa4c9c93SCrestez Dan Leonard return ret;
321fa4c9c93SCrestez Dan Leonard }
322fa4c9c93SCrestez Dan Leonard
323fa4c9c93SCrestez Dan Leonard static const struct iio_chan_spec hp206c_channels[] = {
324fa4c9c93SCrestez Dan Leonard {
325fa4c9c93SCrestez Dan Leonard .type = IIO_TEMP,
326fa4c9c93SCrestez Dan Leonard .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
327fa4c9c93SCrestez Dan Leonard BIT(IIO_CHAN_INFO_SCALE) |
328fa4c9c93SCrestez Dan Leonard BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
329fa4c9c93SCrestez Dan Leonard },
330fa4c9c93SCrestez Dan Leonard {
331fa4c9c93SCrestez Dan Leonard .type = IIO_PRESSURE,
332fa4c9c93SCrestez Dan Leonard .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
333fa4c9c93SCrestez Dan Leonard BIT(IIO_CHAN_INFO_SCALE) |
334fa4c9c93SCrestez Dan Leonard BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
335fa4c9c93SCrestez Dan Leonard }
336fa4c9c93SCrestez Dan Leonard };
337fa4c9c93SCrestez Dan Leonard
338fa4c9c93SCrestez Dan Leonard static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(hp206c_osr_rates_str);
339fa4c9c93SCrestez Dan Leonard
340fa4c9c93SCrestez Dan Leonard static struct attribute *hp206c_attributes[] = {
341fa4c9c93SCrestez Dan Leonard &iio_const_attr_sampling_frequency_available.dev_attr.attr,
342fa4c9c93SCrestez Dan Leonard NULL,
343fa4c9c93SCrestez Dan Leonard };
344fa4c9c93SCrestez Dan Leonard
345fa4c9c93SCrestez Dan Leonard static const struct attribute_group hp206c_attribute_group = {
346fa4c9c93SCrestez Dan Leonard .attrs = hp206c_attributes,
347fa4c9c93SCrestez Dan Leonard };
348fa4c9c93SCrestez Dan Leonard
349fa4c9c93SCrestez Dan Leonard static const struct iio_info hp206c_info = {
350fa4c9c93SCrestez Dan Leonard .attrs = &hp206c_attribute_group,
351fa4c9c93SCrestez Dan Leonard .read_raw = hp206c_read_raw,
352fa4c9c93SCrestez Dan Leonard .write_raw = hp206c_write_raw,
353fa4c9c93SCrestez Dan Leonard };
354fa4c9c93SCrestez Dan Leonard
hp206c_probe(struct i2c_client * client)355240c69e0SUwe Kleine-König static int hp206c_probe(struct i2c_client *client)
356fa4c9c93SCrestez Dan Leonard {
357240c69e0SUwe Kleine-König const struct i2c_device_id *id = i2c_client_get_device_id(client);
358fa4c9c93SCrestez Dan Leonard struct iio_dev *indio_dev;
359fa4c9c93SCrestez Dan Leonard struct hp206c_data *data;
360fa4c9c93SCrestez Dan Leonard int ret;
361fa4c9c93SCrestez Dan Leonard
362fa4c9c93SCrestez Dan Leonard if (!i2c_check_functionality(client->adapter,
363fa4c9c93SCrestez Dan Leonard I2C_FUNC_SMBUS_BYTE |
364fa4c9c93SCrestez Dan Leonard I2C_FUNC_SMBUS_BYTE_DATA |
365fa4c9c93SCrestez Dan Leonard I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
366fa4c9c93SCrestez Dan Leonard dev_err(&client->dev, "Adapter does not support "
367fa4c9c93SCrestez Dan Leonard "all required i2c functionality\n");
368fa4c9c93SCrestez Dan Leonard return -ENODEV;
369fa4c9c93SCrestez Dan Leonard }
370fa4c9c93SCrestez Dan Leonard
371fa4c9c93SCrestez Dan Leonard indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
372fa4c9c93SCrestez Dan Leonard if (!indio_dev)
373fa4c9c93SCrestez Dan Leonard return -ENOMEM;
374fa4c9c93SCrestez Dan Leonard
375fa4c9c93SCrestez Dan Leonard data = iio_priv(indio_dev);
376fa4c9c93SCrestez Dan Leonard data->client = client;
377fa4c9c93SCrestez Dan Leonard mutex_init(&data->mutex);
378fa4c9c93SCrestez Dan Leonard
379fa4c9c93SCrestez Dan Leonard indio_dev->info = &hp206c_info;
380fa4c9c93SCrestez Dan Leonard indio_dev->name = id->name;
381fa4c9c93SCrestez Dan Leonard indio_dev->modes = INDIO_DIRECT_MODE;
382fa4c9c93SCrestez Dan Leonard indio_dev->channels = hp206c_channels;
383fa4c9c93SCrestez Dan Leonard indio_dev->num_channels = ARRAY_SIZE(hp206c_channels);
384fa4c9c93SCrestez Dan Leonard
385fa4c9c93SCrestez Dan Leonard i2c_set_clientdata(client, indio_dev);
386fa4c9c93SCrestez Dan Leonard
387fa4c9c93SCrestez Dan Leonard /* Do a soft reset on probe */
388fa4c9c93SCrestez Dan Leonard ret = hp206c_soft_reset(indio_dev);
389fa4c9c93SCrestez Dan Leonard if (ret) {
390fa4c9c93SCrestez Dan Leonard dev_err(&client->dev, "Failed to reset on startup: %d\n", ret);
391fa4c9c93SCrestez Dan Leonard return -ENODEV;
392fa4c9c93SCrestez Dan Leonard }
393fa4c9c93SCrestez Dan Leonard
394fa4c9c93SCrestez Dan Leonard return devm_iio_device_register(&client->dev, indio_dev);
395fa4c9c93SCrestez Dan Leonard }
396fa4c9c93SCrestez Dan Leonard
397fa4c9c93SCrestez Dan Leonard static const struct i2c_device_id hp206c_id[] = {
398fa4c9c93SCrestez Dan Leonard {"hp206c"},
399fa4c9c93SCrestez Dan Leonard {}
400fa4c9c93SCrestez Dan Leonard };
401cdd469adSJavier Martinez Canillas MODULE_DEVICE_TABLE(i2c, hp206c_id);
402fa4c9c93SCrestez Dan Leonard
403fa4c9c93SCrestez Dan Leonard static const struct acpi_device_id hp206c_acpi_match[] = {
404fa4c9c93SCrestez Dan Leonard {"HOP206C", 0},
405fa4c9c93SCrestez Dan Leonard { },
406fa4c9c93SCrestez Dan Leonard };
407fa4c9c93SCrestez Dan Leonard MODULE_DEVICE_TABLE(acpi, hp206c_acpi_match);
408fa4c9c93SCrestez Dan Leonard
409fa4c9c93SCrestez Dan Leonard static struct i2c_driver hp206c_driver = {
4107cf15f42SUwe Kleine-König .probe = hp206c_probe,
411fa4c9c93SCrestez Dan Leonard .id_table = hp206c_id,
412fa4c9c93SCrestez Dan Leonard .driver = {
413fa4c9c93SCrestez Dan Leonard .name = "hp206c",
414*51feb3e3SJonathan Cameron .acpi_match_table = hp206c_acpi_match,
415fa4c9c93SCrestez Dan Leonard },
416fa4c9c93SCrestez Dan Leonard };
417fa4c9c93SCrestez Dan Leonard
418fa4c9c93SCrestez Dan Leonard module_i2c_driver(hp206c_driver);
419fa4c9c93SCrestez Dan Leonard
420fa4c9c93SCrestez Dan Leonard MODULE_DESCRIPTION("HOPERF HP206C precision barometer and altimeter sensor");
421fa4c9c93SCrestez Dan Leonard MODULE_AUTHOR("Leonard Crestez <leonard.crestez@intel.com>");
422fa4c9c93SCrestez Dan Leonard MODULE_LICENSE("GPL v2");
423