1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2016 - Marcin Malagowski <mrc@bourne.st>
4 */
5#include <linux/delay.h>
6#include <linux/device.h>
7#include <linux/err.h>
8#include <linux/i2c.h>
9#include <linux/io.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/iio/iio.h>
13
14#define ABP060MG_ERROR_MASK   0xC000
15#define ABP060MG_RESP_TIME_MS 40
16#define ABP060MG_MIN_COUNTS   1638  /* = 0x0666 (10% of u14) */
17#define ABP060MG_MAX_COUNTS   14745 /* = 0x3999 (90% of u14) */
18#define ABP060MG_NUM_COUNTS   (ABP060MG_MAX_COUNTS - ABP060MG_MIN_COUNTS)
19
20enum abp_variant {
21	/* gage [kPa] */
22	ABP006KG, ABP010KG, ABP016KG, ABP025KG, ABP040KG, ABP060KG, ABP100KG,
23	ABP160KG, ABP250KG, ABP400KG, ABP600KG, ABP001GG,
24	/* differential [kPa] */
25	ABP006KD, ABP010KD, ABP016KD, ABP025KD, ABP040KD, ABP060KD, ABP100KD,
26	ABP160KD, ABP250KD, ABP400KD,
27	/* gage [psi] */
28	ABP001PG, ABP005PG, ABP015PG, ABP030PG, ABP060PG, ABP100PG, ABP150PG,
29	/* differential [psi] */
30	ABP001PD, ABP005PD, ABP015PD, ABP030PD, ABP060PD,
31};
32
33struct abp_config {
34	int min;
35	int max;
36};
37
38static struct abp_config abp_config[] = {
39	/* mbar & kPa variants */
40	[ABP006KG] = { .min =       0, .max =     6000 },
41	[ABP010KG] = { .min =       0, .max =    10000 },
42	[ABP016KG] = { .min =       0, .max =    16000 },
43	[ABP025KG] = { .min =       0, .max =    25000 },
44	[ABP040KG] = { .min =       0, .max =    40000 },
45	[ABP060KG] = { .min =       0, .max =    60000 },
46	[ABP100KG] = { .min =       0, .max =   100000 },
47	[ABP160KG] = { .min =       0, .max =   160000 },
48	[ABP250KG] = { .min =       0, .max =   250000 },
49	[ABP400KG] = { .min =       0, .max =   400000 },
50	[ABP600KG] = { .min =       0, .max =   600000 },
51	[ABP001GG] = { .min =       0, .max =  1000000 },
52	[ABP006KD] = { .min =   -6000, .max =     6000 },
53	[ABP010KD] = { .min =  -10000, .max =    10000 },
54	[ABP016KD] = { .min =  -16000, .max =    16000 },
55	[ABP025KD] = { .min =  -25000, .max =    25000 },
56	[ABP040KD] = { .min =  -40000, .max =    40000 },
57	[ABP060KD] = { .min =  -60000, .max =    60000 },
58	[ABP100KD] = { .min = -100000, .max =   100000 },
59	[ABP160KD] = { .min = -160000, .max =   160000 },
60	[ABP250KD] = { .min = -250000, .max =   250000 },
61	[ABP400KD] = { .min = -400000, .max =   400000 },
62	/* psi variants (1 psi ~ 6895 Pa) */
63	[ABP001PG] = { .min =       0, .max =     6985 },
64	[ABP005PG] = { .min =       0, .max =    34474 },
65	[ABP015PG] = { .min =       0, .max =   103421 },
66	[ABP030PG] = { .min =       0, .max =   206843 },
67	[ABP060PG] = { .min =       0, .max =   413686 },
68	[ABP100PG] = { .min =       0, .max =   689476 },
69	[ABP150PG] = { .min =       0, .max =  1034214 },
70	[ABP001PD] = { .min =   -6895, .max =     6895 },
71	[ABP005PD] = { .min =  -34474, .max =    34474 },
72	[ABP015PD] = { .min = -103421, .max =   103421 },
73	[ABP030PD] = { .min = -206843, .max =   206843 },
74	[ABP060PD] = { .min = -413686, .max =   413686 },
75};
76
77struct abp_state {
78	struct i2c_client *client;
79	struct mutex lock;
80
81	/*
82	 * bus-dependent MEASURE_REQUEST length.
83	 * If no SMBUS_QUICK support, need to send dummy byte
84	 */
85	int mreq_len;
86
87	/* model-dependent values (calculated on probe) */
88	int scale;
89	int offset;
90};
91
92static const struct iio_chan_spec abp060mg_channels[] = {
93	{
94		.type = IIO_PRESSURE,
95		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
96			BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE),
97	},
98};
99
100static int abp060mg_get_measurement(struct abp_state *state, int *val)
101{
102	struct i2c_client *client = state->client;
103	__be16 buf[2];
104	u16 pressure;
105	int ret;
106
107	buf[0] = 0;
108	ret = i2c_master_send(client, (u8 *)&buf, state->mreq_len);
109	if (ret < 0)
110		return ret;
111
112	msleep_interruptible(ABP060MG_RESP_TIME_MS);
113
114	ret = i2c_master_recv(client, (u8 *)&buf, sizeof(buf));
115	if (ret < 0)
116		return ret;
117
118	pressure = be16_to_cpu(buf[0]);
119	if (pressure & ABP060MG_ERROR_MASK)
120		return -EIO;
121
122	if (pressure < ABP060MG_MIN_COUNTS || pressure > ABP060MG_MAX_COUNTS)
123		return -EIO;
124
125	*val = pressure;
126
127	return IIO_VAL_INT;
128}
129
130static int abp060mg_read_raw(struct iio_dev *indio_dev,
131			struct iio_chan_spec const *chan, int *val,
132			int *val2, long mask)
133{
134	struct abp_state *state = iio_priv(indio_dev);
135	int ret;
136
137	mutex_lock(&state->lock);
138
139	switch (mask) {
140	case IIO_CHAN_INFO_RAW:
141		ret = abp060mg_get_measurement(state, val);
142		break;
143	case IIO_CHAN_INFO_OFFSET:
144		*val = state->offset;
145		ret = IIO_VAL_INT;
146		break;
147	case IIO_CHAN_INFO_SCALE:
148		*val = state->scale;
149		*val2 = ABP060MG_NUM_COUNTS * 1000; /* to kPa */
150		ret = IIO_VAL_FRACTIONAL;
151		break;
152	default:
153		ret = -EINVAL;
154		break;
155	}
156
157	mutex_unlock(&state->lock);
158	return ret;
159}
160
161static const struct iio_info abp060mg_info = {
162	.read_raw = abp060mg_read_raw,
163};
164
165static void abp060mg_init_device(struct iio_dev *indio_dev, unsigned long id)
166{
167	struct abp_state *state = iio_priv(indio_dev);
168	struct abp_config *cfg = &abp_config[id];
169
170	state->scale = cfg->max - cfg->min;
171	state->offset = -ABP060MG_MIN_COUNTS;
172
173	if (cfg->min < 0) /* differential */
174		state->offset -= ABP060MG_NUM_COUNTS >> 1;
175}
176
177static int abp060mg_probe(struct i2c_client *client)
178{
179	const struct i2c_device_id *id = i2c_client_get_device_id(client);
180	struct iio_dev *indio_dev;
181	struct abp_state *state;
182	unsigned long cfg_id = id->driver_data;
183
184	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*state));
185	if (!indio_dev)
186		return -ENOMEM;
187
188	state = iio_priv(indio_dev);
189	i2c_set_clientdata(client, state);
190	state->client = client;
191
192	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_QUICK))
193		state->mreq_len = 1;
194
195	abp060mg_init_device(indio_dev, cfg_id);
196
197	indio_dev->name = dev_name(&client->dev);
198	indio_dev->modes = INDIO_DIRECT_MODE;
199	indio_dev->info = &abp060mg_info;
200
201	indio_dev->channels = abp060mg_channels;
202	indio_dev->num_channels = ARRAY_SIZE(abp060mg_channels);
203
204	mutex_init(&state->lock);
205
206	return devm_iio_device_register(&client->dev, indio_dev);
207}
208
209static const struct i2c_device_id abp060mg_id_table[] = {
210	/* mbar & kPa variants (abp060m [60 mbar] == abp006k [6 kPa]) */
211	/*    gage: */
212	{ "abp060mg", ABP006KG }, { "abp006kg", ABP006KG },
213	{ "abp100mg", ABP010KG }, { "abp010kg", ABP010KG },
214	{ "abp160mg", ABP016KG }, { "abp016kg", ABP016KG },
215	{ "abp250mg", ABP025KG }, { "abp025kg", ABP025KG },
216	{ "abp400mg", ABP040KG }, { "abp040kg", ABP040KG },
217	{ "abp600mg", ABP060KG }, { "abp060kg", ABP060KG },
218	{ "abp001bg", ABP100KG }, { "abp100kg", ABP100KG },
219	{ "abp1_6bg", ABP160KG }, { "abp160kg", ABP160KG },
220	{ "abp2_5bg", ABP250KG }, { "abp250kg", ABP250KG },
221	{ "abp004bg", ABP400KG }, { "abp400kg", ABP400KG },
222	{ "abp006bg", ABP600KG }, { "abp600kg", ABP600KG },
223	{ "abp010bg", ABP001GG }, { "abp001gg", ABP001GG },
224	/*    differential: */
225	{ "abp060md", ABP006KD }, { "abp006kd", ABP006KD },
226	{ "abp100md", ABP010KD }, { "abp010kd", ABP010KD },
227	{ "abp160md", ABP016KD }, { "abp016kd", ABP016KD },
228	{ "abp250md", ABP025KD }, { "abp025kd", ABP025KD },
229	{ "abp400md", ABP040KD }, { "abp040kd", ABP040KD },
230	{ "abp600md", ABP060KD }, { "abp060kd", ABP060KD },
231	{ "abp001bd", ABP100KD }, { "abp100kd", ABP100KD },
232	{ "abp1_6bd", ABP160KD }, { "abp160kd", ABP160KD },
233	{ "abp2_5bd", ABP250KD }, { "abp250kd", ABP250KD },
234	{ "abp004bd", ABP400KD }, { "abp400kd", ABP400KD },
235	/* psi variants */
236	/*    gage: */
237	{ "abp001pg", ABP001PG },
238	{ "abp005pg", ABP005PG },
239	{ "abp015pg", ABP015PG },
240	{ "abp030pg", ABP030PG },
241	{ "abp060pg", ABP060PG },
242	{ "abp100pg", ABP100PG },
243	{ "abp150pg", ABP150PG },
244	/*    differential: */
245	{ "abp001pd", ABP001PD },
246	{ "abp005pd", ABP005PD },
247	{ "abp015pd", ABP015PD },
248	{ "abp030pd", ABP030PD },
249	{ "abp060pd", ABP060PD },
250	{ /* empty */ },
251};
252MODULE_DEVICE_TABLE(i2c, abp060mg_id_table);
253
254static struct i2c_driver abp060mg_driver = {
255	.driver = {
256		.name = "abp060mg",
257	},
258	.probe = abp060mg_probe,
259	.id_table = abp060mg_id_table,
260};
261module_i2c_driver(abp060mg_driver);
262
263MODULE_AUTHOR("Marcin Malagowski <mrc@bourne.st>");
264MODULE_DESCRIPTION("Honeywell ABP pressure sensor driver");
265MODULE_LICENSE("GPL");
266