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1/*
2 * Copyright (C) 2013 Capella Microsystems Inc.
3 * Author: Kevin Tsai <ktsai@capellamicro.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2, as published
7 * by the Free Software Foundation.
8 */
9
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/i2c.h>
13#include <linux/mutex.h>
14#include <linux/module.h>
15#include <linux/interrupt.h>
16#include <linux/regulator/consumer.h>
17#include <linux/iio/iio.h>
18#include <linux/iio/sysfs.h>
19#include <linux/iio/events.h>
20#include <linux/init.h>
21
22/* Registers Address */
23#define CM32181_REG_ADDR_CMD 0x00
24#define CM32181_REG_ADDR_ALS 0x04
25#define CM32181_REG_ADDR_STATUS 0x06
26#define CM32181_REG_ADDR_ID 0x07
27
28/* Number of Configurable Registers */
29#define CM32181_CONF_REG_NUM 0x01
30
31/* CMD register */
32#define CM32181_CMD_ALS_ENABLE 0x00
33#define CM32181_CMD_ALS_DISABLE 0x01
34#define CM32181_CMD_ALS_INT_EN 0x02
35
36#define CM32181_CMD_ALS_IT_SHIFT 6
37#define CM32181_CMD_ALS_IT_MASK (0x0F << CM32181_CMD_ALS_IT_SHIFT)
38#define CM32181_CMD_ALS_IT_DEFAULT (0x00 << CM32181_CMD_ALS_IT_SHIFT)
39
40#define CM32181_CMD_ALS_SM_SHIFT 11
41#define CM32181_CMD_ALS_SM_MASK (0x03 << CM32181_CMD_ALS_SM_SHIFT)
42#define CM32181_CMD_ALS_SM_DEFAULT (0x01 << CM32181_CMD_ALS_SM_SHIFT)
43
44#define CM32181_MLUX_PER_BIT 5 /* ALS_SM=01 IT=800ms */
45#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
46#define CM32181_CALIBSCALE_DEFAULT 1000
47#define CM32181_CALIBSCALE_RESOLUTION 1000
48#define MLUX_PER_LUX 1000
49
50static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
51 CM32181_REG_ADDR_CMD,
52};
53
54static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
55static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
56 800000};
57
58struct cm32181_chip {
59 struct i2c_client *client;
60 struct mutex lock;
61 u16 conf_regs[CM32181_CONF_REG_NUM];
62 int calibscale;
63};
64
65/**
66 * cm32181_reg_init() - Initialize CM32181 registers
67 * @cm32181: pointer of struct cm32181.
68 *
69 * Initialize CM32181 ambient light sensor register to default values.
70 *
71 * Return: 0 for success; otherwise for error code.
72 */
73static int cm32181_reg_init(struct cm32181_chip *cm32181)
74{
75 struct i2c_client *client = cm32181->client;
76 int i;
77 s32 ret;
78
79 ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
80 if (ret < 0)
81 return ret;
82
83 /* check device ID */
84 if ((ret & 0xFF) != 0x81)
85 return -ENODEV;
86
87 /* Default Values */
88 cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE |
89 CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
90 cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
91
92 /* Initialize registers*/
93 for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
94 ret = i2c_smbus_write_word_data(client, cm32181_reg[i],
95 cm32181->conf_regs[i]);
96 if (ret < 0)
97 return ret;
98 }
99
100 return 0;
101}
102
103/**
104 * cm32181_read_als_it() - Get sensor integration time (ms)
105 * @cm32181: pointer of struct cm32181
106 * @val2: pointer of int to load the als_it value.
107 *
108 * Report the current integartion time by millisecond.
109 *
110 * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
111 */
112static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2)
113{
114 u16 als_it;
115 int i;
116
117 als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
118 als_it &= CM32181_CMD_ALS_IT_MASK;
119 als_it >>= CM32181_CMD_ALS_IT_SHIFT;
120 for (i = 0; i < ARRAY_SIZE(als_it_bits); i++) {
121 if (als_it == als_it_bits[i]) {
122 *val2 = als_it_value[i];
123 return IIO_VAL_INT_PLUS_MICRO;
124 }
125 }
126
127 return -EINVAL;
128}
129
130/**
131 * cm32181_write_als_it() - Write sensor integration time
132 * @cm32181: pointer of struct cm32181.
133 * @val: integration time by millisecond.
134 *
135 * Convert integration time (ms) to sensor value.
136 *
137 * Return: i2c_smbus_write_word_data command return value.
138 */
139static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
140{
141 struct i2c_client *client = cm32181->client;
142 u16 als_it;
143 int ret, i, n;
144
145 n = ARRAY_SIZE(als_it_value);
146 for (i = 0; i < n; i++)
147 if (val <= als_it_value[i])
148 break;
149 if (i >= n)
150 i = n - 1;
151
152 als_it = als_it_bits[i];
153 als_it <<= CM32181_CMD_ALS_IT_SHIFT;
154
155 mutex_lock(&cm32181->lock);
156 cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
157 ~CM32181_CMD_ALS_IT_MASK;
158 cm32181->conf_regs[CM32181_REG_ADDR_CMD] |=
159 als_it;
160 ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
161 cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
162 mutex_unlock(&cm32181->lock);
163
164 return ret;
165}
166
167/**
168 * cm32181_get_lux() - report current lux value
169 * @cm32181: pointer of struct cm32181.
170 *
171 * Convert sensor raw data to lux. It depends on integration
172 * time and calibscale variable.
173 *
174 * Return: Positive value is lux, otherwise is error code.
175 */
176static int cm32181_get_lux(struct cm32181_chip *cm32181)
177{
178 struct i2c_client *client = cm32181->client;
179 int ret;
180 int als_it;
181 unsigned long lux;
182
183 ret = cm32181_read_als_it(cm32181, &als_it);
184 if (ret < 0)
185 return -EINVAL;
186
187 lux = CM32181_MLUX_PER_BIT;
188 lux *= CM32181_MLUX_PER_BIT_BASE_IT;
189 lux /= als_it;
190
191 ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
192 if (ret < 0)
193 return ret;
194
195 lux *= ret;
196 lux *= cm32181->calibscale;
197 lux /= CM32181_CALIBSCALE_RESOLUTION;
198 lux /= MLUX_PER_LUX;
199
200 if (lux > 0xFFFF)
201 lux = 0xFFFF;
202
203 return lux;
204}
205
206static int cm32181_read_raw(struct iio_dev *indio_dev,
207 struct iio_chan_spec const *chan,
208 int *val, int *val2, long mask)
209{
210 struct cm32181_chip *cm32181 = iio_priv(indio_dev);
211 int ret;
212
213 switch (mask) {
214 case IIO_CHAN_INFO_PROCESSED:
215 ret = cm32181_get_lux(cm32181);
216 if (ret < 0)
217 return ret;
218 *val = ret;
219 return IIO_VAL_INT;
220 case IIO_CHAN_INFO_CALIBSCALE:
221 *val = cm32181->calibscale;
222 return IIO_VAL_INT;
223 case IIO_CHAN_INFO_INT_TIME:
224 *val = 0;
225 ret = cm32181_read_als_it(cm32181, val2);
226 return ret;
227 }
228
229 return -EINVAL;
230}
231
232static int cm32181_write_raw(struct iio_dev *indio_dev,
233 struct iio_chan_spec const *chan,
234 int val, int val2, long mask)
235{
236 struct cm32181_chip *cm32181 = iio_priv(indio_dev);
237 int ret;
238
239 switch (mask) {
240 case IIO_CHAN_INFO_CALIBSCALE:
241 cm32181->calibscale = val;
242 return val;
243 case IIO_CHAN_INFO_INT_TIME:
244 ret = cm32181_write_als_it(cm32181, val2);
245 return ret;
246 }
247
248 return -EINVAL;
249}
250
251/**
252 * cm32181_get_it_available() - Get available ALS IT value
253 * @dev: pointer of struct device.
254 * @attr: pointer of struct device_attribute.
255 * @buf: pointer of return string buffer.
256 *
257 * Display the available integration time values by millisecond.
258 *
259 * Return: string length.
260 */
261static ssize_t cm32181_get_it_available(struct device *dev,
262 struct device_attribute *attr, char *buf)
263{
264 int i, n, len;
265
266 n = ARRAY_SIZE(als_it_value);
267 for (i = 0, len = 0; i < n; i++)
268 len += sprintf(buf + len, "0.%06u ", als_it_value[i]);
269 return len + sprintf(buf + len, "\n");
270}
271
272static const struct iio_chan_spec cm32181_channels[] = {
273 {
274 .type = IIO_LIGHT,
275 .info_mask_separate =
276 BIT(IIO_CHAN_INFO_PROCESSED) |
277 BIT(IIO_CHAN_INFO_CALIBSCALE) |
278 BIT(IIO_CHAN_INFO_INT_TIME),
279 }
280};
281
282static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
283 S_IRUGO, cm32181_get_it_available, NULL, 0);
284
285static struct attribute *cm32181_attributes[] = {
286 &iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
287 NULL,
288};
289
290static const struct attribute_group cm32181_attribute_group = {
291 .attrs = cm32181_attributes
292};
293
294static const struct iio_info cm32181_info = {
295 .driver_module = THIS_MODULE,
296 .read_raw = &cm32181_read_raw,
297 .write_raw = &cm32181_write_raw,
298 .attrs = &cm32181_attribute_group,
299};
300
301static int cm32181_probe(struct i2c_client *client,
302 const struct i2c_device_id *id)
303{
304 struct cm32181_chip *cm32181;
305 struct iio_dev *indio_dev;
306 int ret;
307
308 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
309 if (!indio_dev) {
310 dev_err(&client->dev, "devm_iio_device_alloc failed\n");
311 return -ENOMEM;
312 }
313
314 cm32181 = iio_priv(indio_dev);
315 i2c_set_clientdata(client, indio_dev);
316 cm32181->client = client;
317
318 mutex_init(&cm32181->lock);
319 indio_dev->dev.parent = &client->dev;
320 indio_dev->channels = cm32181_channels;
321 indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
322 indio_dev->info = &cm32181_info;
323 indio_dev->name = id->name;
324 indio_dev->modes = INDIO_DIRECT_MODE;
325
326 ret = cm32181_reg_init(cm32181);
327 if (ret) {
328 dev_err(&client->dev,
329 "%s: register init failed\n",
330 __func__);
331 return ret;
332 }
333
334 ret = devm_iio_device_register(&client->dev, indio_dev);
335 if (ret) {
336 dev_err(&client->dev,
337 "%s: regist device failed\n",
338 __func__);
339 return ret;
340 }
341
342 return 0;
343}
344
345static const struct i2c_device_id cm32181_id[] = {
346 { "cm32181", 0 },
347 { }
348};
349
350MODULE_DEVICE_TABLE(i2c, cm32181_id);
351
352static const struct of_device_id cm32181_of_match[] = {
353 { .compatible = "capella,cm32181" },
354 { }
355};
356MODULE_DEVICE_TABLE(of, cm32181_of_match);
357
358static struct i2c_driver cm32181_driver = {
359 .driver = {
360 .name = "cm32181",
361 .of_match_table = of_match_ptr(cm32181_of_match),
362 },
363 .id_table = cm32181_id,
364 .probe = cm32181_probe,
365};
366
367module_i2c_driver(cm32181_driver);
368
369MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
370MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
371MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Capella Microsystems Inc.
4 * Author: Kevin Tsai <ktsai@capellamicro.com>
5 */
6
7#include <linux/acpi.h>
8#include <linux/delay.h>
9#include <linux/err.h>
10#include <linux/i2c.h>
11#include <linux/mutex.h>
12#include <linux/module.h>
13#include <linux/mod_devicetable.h>
14#include <linux/interrupt.h>
15#include <linux/regulator/consumer.h>
16#include <linux/iio/iio.h>
17#include <linux/iio/sysfs.h>
18#include <linux/iio/events.h>
19#include <linux/init.h>
20
21/* Registers Address */
22#define CM32181_REG_ADDR_CMD 0x00
23#define CM32181_REG_ADDR_WH 0x01
24#define CM32181_REG_ADDR_WL 0x02
25#define CM32181_REG_ADDR_TEST 0x03
26#define CM32181_REG_ADDR_ALS 0x04
27#define CM32181_REG_ADDR_STATUS 0x06
28#define CM32181_REG_ADDR_ID 0x07
29
30/* Number of Configurable Registers */
31#define CM32181_CONF_REG_NUM 4
32
33/* CMD register */
34#define CM32181_CMD_ALS_DISABLE BIT(0)
35#define CM32181_CMD_ALS_INT_EN BIT(1)
36#define CM32181_CMD_ALS_THRES_WINDOW BIT(2)
37
38#define CM32181_CMD_ALS_PERS_SHIFT 4
39#define CM32181_CMD_ALS_PERS_MASK (0x03 << CM32181_CMD_ALS_PERS_SHIFT)
40#define CM32181_CMD_ALS_PERS_DEFAULT (0x01 << CM32181_CMD_ALS_PERS_SHIFT)
41
42#define CM32181_CMD_ALS_IT_SHIFT 6
43#define CM32181_CMD_ALS_IT_MASK (0x0F << CM32181_CMD_ALS_IT_SHIFT)
44#define CM32181_CMD_ALS_IT_DEFAULT (0x00 << CM32181_CMD_ALS_IT_SHIFT)
45
46#define CM32181_CMD_ALS_SM_SHIFT 11
47#define CM32181_CMD_ALS_SM_MASK (0x03 << CM32181_CMD_ALS_SM_SHIFT)
48#define CM32181_CMD_ALS_SM_DEFAULT (0x01 << CM32181_CMD_ALS_SM_SHIFT)
49
50#define CM32181_LUX_PER_BIT 500 /* ALS_SM=01 IT=800ms */
51#define CM32181_LUX_PER_BIT_RESOLUTION 100000
52#define CM32181_LUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
53#define CM32181_CALIBSCALE_DEFAULT 100000
54#define CM32181_CALIBSCALE_RESOLUTION 100000
55
56#define SMBUS_ALERT_RESPONSE_ADDRESS 0x0c
57
58/* CPM0 Index 0: device-id (3218 or 32181), 1: Unknown, 2: init_regs_bitmap */
59#define CPM0_REGS_BITMAP 2
60#define CPM0_HEADER_SIZE 3
61
62/* CPM1 Index 0: lux_per_bit, 1: calibscale, 2: resolution (100000) */
63#define CPM1_LUX_PER_BIT 0
64#define CPM1_CALIBSCALE 1
65#define CPM1_SIZE 3
66
67/* CM3218 Family */
68static const int cm3218_als_it_bits[] = { 0, 1, 2, 3 };
69static const int cm3218_als_it_values[] = { 100000, 200000, 400000, 800000 };
70
71/* CM32181 Family */
72static const int cm32181_als_it_bits[] = { 12, 8, 0, 1, 2, 3 };
73static const int cm32181_als_it_values[] = {
74 25000, 50000, 100000, 200000, 400000, 800000
75};
76
77struct cm32181_chip {
78 struct i2c_client *client;
79 struct device *dev;
80 struct mutex lock;
81 u16 conf_regs[CM32181_CONF_REG_NUM];
82 unsigned long init_regs_bitmap;
83 int calibscale;
84 int lux_per_bit;
85 int lux_per_bit_base_it;
86 int num_als_it;
87 const int *als_it_bits;
88 const int *als_it_values;
89};
90
91static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2);
92
93#ifdef CONFIG_ACPI
94/**
95 * cm32181_acpi_get_cpm() - Get CPM object from ACPI
96 * @dev: pointer of struct device.
97 * @obj_name: pointer of ACPI object name.
98 * @values: pointer of array for return elements.
99 * @count: maximum size of return array.
100 *
101 * Convert ACPI CPM table to array.
102 *
103 * Return: -ENODEV for fail. Otherwise is number of elements.
104 */
105static int cm32181_acpi_get_cpm(struct device *dev, char *obj_name,
106 u64 *values, int count)
107{
108 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
109 union acpi_object *cpm, *elem;
110 acpi_handle handle;
111 acpi_status status;
112 int i;
113
114 handle = ACPI_HANDLE(dev);
115 if (!handle)
116 return -ENODEV;
117
118 status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
119 if (ACPI_FAILURE(status)) {
120 dev_err(dev, "object %s not found\n", obj_name);
121 return -ENODEV;
122 }
123
124 cpm = buffer.pointer;
125 if (cpm->package.count > count)
126 dev_warn(dev, "%s table contains %u values, only using first %d values\n",
127 obj_name, cpm->package.count, count);
128
129 count = min_t(int, cpm->package.count, count);
130 for (i = 0; i < count; i++) {
131 elem = &(cpm->package.elements[i]);
132 values[i] = elem->integer.value;
133 }
134
135 kfree(buffer.pointer);
136
137 return count;
138}
139
140static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
141{
142 u64 vals[CPM0_HEADER_SIZE + CM32181_CONF_REG_NUM];
143 struct device *dev = cm32181->dev;
144 int i, count;
145
146 count = cm32181_acpi_get_cpm(dev, "CPM0", vals, ARRAY_SIZE(vals));
147 if (count <= CPM0_HEADER_SIZE)
148 return;
149
150 count -= CPM0_HEADER_SIZE;
151
152 cm32181->init_regs_bitmap = vals[CPM0_REGS_BITMAP];
153 cm32181->init_regs_bitmap &= GENMASK(count - 1, 0);
154 for_each_set_bit(i, &cm32181->init_regs_bitmap, count)
155 cm32181->conf_regs[i] = vals[CPM0_HEADER_SIZE + i];
156
157 count = cm32181_acpi_get_cpm(dev, "CPM1", vals, ARRAY_SIZE(vals));
158 if (count != CPM1_SIZE)
159 return;
160
161 cm32181->lux_per_bit = vals[CPM1_LUX_PER_BIT];
162
163 /* Check for uncalibrated devices */
164 if (vals[CPM1_CALIBSCALE] == CM32181_CALIBSCALE_DEFAULT)
165 return;
166
167 cm32181->calibscale = vals[CPM1_CALIBSCALE];
168 /* CPM1 lux_per_bit is for the current it value */
169 cm32181_read_als_it(cm32181, &cm32181->lux_per_bit_base_it);
170}
171#else
172static void cm32181_acpi_parse_cpm_tables(struct cm32181_chip *cm32181)
173{
174}
175#endif /* CONFIG_ACPI */
176
177/**
178 * cm32181_reg_init() - Initialize CM32181 registers
179 * @cm32181: pointer of struct cm32181.
180 *
181 * Initialize CM32181 ambient light sensor register to default values.
182 *
183 * Return: 0 for success; otherwise for error code.
184 */
185static int cm32181_reg_init(struct cm32181_chip *cm32181)
186{
187 struct i2c_client *client = cm32181->client;
188 int i;
189 s32 ret;
190
191 ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
192 if (ret < 0)
193 return ret;
194
195 /* check device ID */
196 switch (ret & 0xFF) {
197 case 0x18: /* CM3218 */
198 cm32181->num_als_it = ARRAY_SIZE(cm3218_als_it_bits);
199 cm32181->als_it_bits = cm3218_als_it_bits;
200 cm32181->als_it_values = cm3218_als_it_values;
201 break;
202 case 0x81: /* CM32181 */
203 case 0x82: /* CM32182, fully compat. with CM32181 */
204 cm32181->num_als_it = ARRAY_SIZE(cm32181_als_it_bits);
205 cm32181->als_it_bits = cm32181_als_it_bits;
206 cm32181->als_it_values = cm32181_als_it_values;
207 break;
208 default:
209 return -ENODEV;
210 }
211
212 /* Default Values */
213 cm32181->conf_regs[CM32181_REG_ADDR_CMD] =
214 CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
215 cm32181->init_regs_bitmap = BIT(CM32181_REG_ADDR_CMD);
216 cm32181->calibscale = CM32181_CALIBSCALE_DEFAULT;
217 cm32181->lux_per_bit = CM32181_LUX_PER_BIT;
218 cm32181->lux_per_bit_base_it = CM32181_LUX_PER_BIT_BASE_IT;
219
220 if (ACPI_HANDLE(cm32181->dev))
221 cm32181_acpi_parse_cpm_tables(cm32181);
222
223 /* Initialize registers*/
224 for_each_set_bit(i, &cm32181->init_regs_bitmap, CM32181_CONF_REG_NUM) {
225 ret = i2c_smbus_write_word_data(client, i,
226 cm32181->conf_regs[i]);
227 if (ret < 0)
228 return ret;
229 }
230
231 return 0;
232}
233
234/**
235 * cm32181_read_als_it() - Get sensor integration time (ms)
236 * @cm32181: pointer of struct cm32181
237 * @val2: pointer of int to load the als_it value.
238 *
239 * Report the current integration time in milliseconds.
240 *
241 * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
242 */
243static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val2)
244{
245 u16 als_it;
246 int i;
247
248 als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
249 als_it &= CM32181_CMD_ALS_IT_MASK;
250 als_it >>= CM32181_CMD_ALS_IT_SHIFT;
251 for (i = 0; i < cm32181->num_als_it; i++) {
252 if (als_it == cm32181->als_it_bits[i]) {
253 *val2 = cm32181->als_it_values[i];
254 return IIO_VAL_INT_PLUS_MICRO;
255 }
256 }
257
258 return -EINVAL;
259}
260
261/**
262 * cm32181_write_als_it() - Write sensor integration time
263 * @cm32181: pointer of struct cm32181.
264 * @val: integration time by millisecond.
265 *
266 * Convert integration time (ms) to sensor value.
267 *
268 * Return: i2c_smbus_write_word_data command return value.
269 */
270static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
271{
272 struct i2c_client *client = cm32181->client;
273 u16 als_it;
274 int ret, i, n;
275
276 n = cm32181->num_als_it;
277 for (i = 0; i < n; i++)
278 if (val <= cm32181->als_it_values[i])
279 break;
280 if (i >= n)
281 i = n - 1;
282
283 als_it = cm32181->als_it_bits[i];
284 als_it <<= CM32181_CMD_ALS_IT_SHIFT;
285
286 mutex_lock(&cm32181->lock);
287 cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
288 ~CM32181_CMD_ALS_IT_MASK;
289 cm32181->conf_regs[CM32181_REG_ADDR_CMD] |=
290 als_it;
291 ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
292 cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
293 mutex_unlock(&cm32181->lock);
294
295 return ret;
296}
297
298/**
299 * cm32181_get_lux() - report current lux value
300 * @cm32181: pointer of struct cm32181.
301 *
302 * Convert sensor raw data to lux. It depends on integration
303 * time and calibscale variable.
304 *
305 * Return: Positive value is lux, otherwise is error code.
306 */
307static int cm32181_get_lux(struct cm32181_chip *cm32181)
308{
309 struct i2c_client *client = cm32181->client;
310 int ret;
311 int als_it;
312 u64 lux;
313
314 ret = cm32181_read_als_it(cm32181, &als_it);
315 if (ret < 0)
316 return -EINVAL;
317
318 lux = cm32181->lux_per_bit;
319 lux *= cm32181->lux_per_bit_base_it;
320 lux = div_u64(lux, als_it);
321
322 ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ALS);
323 if (ret < 0)
324 return ret;
325
326 lux *= ret;
327 lux *= cm32181->calibscale;
328 lux = div_u64(lux, CM32181_CALIBSCALE_RESOLUTION);
329 lux = div_u64(lux, CM32181_LUX_PER_BIT_RESOLUTION);
330
331 if (lux > 0xFFFF)
332 lux = 0xFFFF;
333
334 return lux;
335}
336
337static int cm32181_read_raw(struct iio_dev *indio_dev,
338 struct iio_chan_spec const *chan,
339 int *val, int *val2, long mask)
340{
341 struct cm32181_chip *cm32181 = iio_priv(indio_dev);
342 int ret;
343
344 switch (mask) {
345 case IIO_CHAN_INFO_PROCESSED:
346 ret = cm32181_get_lux(cm32181);
347 if (ret < 0)
348 return ret;
349 *val = ret;
350 return IIO_VAL_INT;
351 case IIO_CHAN_INFO_CALIBSCALE:
352 *val = cm32181->calibscale;
353 return IIO_VAL_INT;
354 case IIO_CHAN_INFO_INT_TIME:
355 *val = 0;
356 ret = cm32181_read_als_it(cm32181, val2);
357 return ret;
358 }
359
360 return -EINVAL;
361}
362
363static int cm32181_write_raw(struct iio_dev *indio_dev,
364 struct iio_chan_spec const *chan,
365 int val, int val2, long mask)
366{
367 struct cm32181_chip *cm32181 = iio_priv(indio_dev);
368 int ret;
369
370 switch (mask) {
371 case IIO_CHAN_INFO_CALIBSCALE:
372 cm32181->calibscale = val;
373 return val;
374 case IIO_CHAN_INFO_INT_TIME:
375 ret = cm32181_write_als_it(cm32181, val2);
376 return ret;
377 }
378
379 return -EINVAL;
380}
381
382/**
383 * cm32181_get_it_available() - Get available ALS IT value
384 * @dev: pointer of struct device.
385 * @attr: pointer of struct device_attribute.
386 * @buf: pointer of return string buffer.
387 *
388 * Display the available integration time values by millisecond.
389 *
390 * Return: string length.
391 */
392static ssize_t cm32181_get_it_available(struct device *dev,
393 struct device_attribute *attr, char *buf)
394{
395 struct cm32181_chip *cm32181 = iio_priv(dev_to_iio_dev(dev));
396 int i, n, len;
397
398 n = cm32181->num_als_it;
399 for (i = 0, len = 0; i < n; i++)
400 len += sprintf(buf + len, "0.%06u ", cm32181->als_it_values[i]);
401 return len + sprintf(buf + len, "\n");
402}
403
404static const struct iio_chan_spec cm32181_channels[] = {
405 {
406 .type = IIO_LIGHT,
407 .info_mask_separate =
408 BIT(IIO_CHAN_INFO_PROCESSED) |
409 BIT(IIO_CHAN_INFO_CALIBSCALE) |
410 BIT(IIO_CHAN_INFO_INT_TIME),
411 }
412};
413
414static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
415 S_IRUGO, cm32181_get_it_available, NULL, 0);
416
417static struct attribute *cm32181_attributes[] = {
418 &iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
419 NULL,
420};
421
422static const struct attribute_group cm32181_attribute_group = {
423 .attrs = cm32181_attributes
424};
425
426static const struct iio_info cm32181_info = {
427 .read_raw = &cm32181_read_raw,
428 .write_raw = &cm32181_write_raw,
429 .attrs = &cm32181_attribute_group,
430};
431
432static int cm32181_probe(struct i2c_client *client)
433{
434 struct device *dev = &client->dev;
435 struct cm32181_chip *cm32181;
436 struct iio_dev *indio_dev;
437 int ret;
438
439 indio_dev = devm_iio_device_alloc(dev, sizeof(*cm32181));
440 if (!indio_dev)
441 return -ENOMEM;
442
443 i2c_set_clientdata(client, indio_dev);
444
445 /*
446 * Some ACPI systems list 2 I2C resources for the CM3218 sensor, the
447 * SMBus Alert Response Address (ARA, 0x0c) and the actual I2C address.
448 * Detect this and take the following step to deal with it:
449 * 1. When a SMBus Alert capable sensor has an Alert asserted, it will
450 * not respond on its actual I2C address. Read a byte from the ARA
451 * to clear any pending Alerts.
452 * 2. Create a "dummy" client for the actual I2C address and
453 * use that client to communicate with the sensor.
454 */
455 if (ACPI_HANDLE(dev) && client->addr == SMBUS_ALERT_RESPONSE_ADDRESS) {
456 struct i2c_board_info board_info = { .type = "dummy" };
457
458 i2c_smbus_read_byte(client);
459
460 client = i2c_acpi_new_device(dev, 1, &board_info);
461 if (IS_ERR(client))
462 return PTR_ERR(client);
463 }
464
465 cm32181 = iio_priv(indio_dev);
466 cm32181->client = client;
467 cm32181->dev = dev;
468
469 mutex_init(&cm32181->lock);
470 indio_dev->channels = cm32181_channels;
471 indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
472 indio_dev->info = &cm32181_info;
473 indio_dev->name = dev_name(dev);
474 indio_dev->modes = INDIO_DIRECT_MODE;
475
476 ret = cm32181_reg_init(cm32181);
477 if (ret) {
478 dev_err(dev, "%s: register init failed\n", __func__);
479 return ret;
480 }
481
482 ret = devm_iio_device_register(dev, indio_dev);
483 if (ret) {
484 dev_err(dev, "%s: regist device failed\n", __func__);
485 return ret;
486 }
487
488 return 0;
489}
490
491static int cm32181_suspend(struct device *dev)
492{
493 struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
494 struct i2c_client *client = cm32181->client;
495
496 return i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
497 CM32181_CMD_ALS_DISABLE);
498}
499
500static int cm32181_resume(struct device *dev)
501{
502 struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
503 struct i2c_client *client = cm32181->client;
504
505 return i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
506 cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
507}
508
509static DEFINE_SIMPLE_DEV_PM_OPS(cm32181_pm_ops, cm32181_suspend, cm32181_resume);
510
511static const struct of_device_id cm32181_of_match[] = {
512 { .compatible = "capella,cm3218" },
513 { .compatible = "capella,cm32181" },
514 { }
515};
516MODULE_DEVICE_TABLE(of, cm32181_of_match);
517
518#ifdef CONFIG_ACPI
519static const struct acpi_device_id cm32181_acpi_match[] = {
520 { "CPLM3218", 0 },
521 { }
522};
523MODULE_DEVICE_TABLE(acpi, cm32181_acpi_match);
524#endif
525
526static struct i2c_driver cm32181_driver = {
527 .driver = {
528 .name = "cm32181",
529 .acpi_match_table = ACPI_PTR(cm32181_acpi_match),
530 .of_match_table = cm32181_of_match,
531 .pm = pm_sleep_ptr(&cm32181_pm_ops),
532 },
533 .probe_new = cm32181_probe,
534};
535
536module_i2c_driver(cm32181_driver);
537
538MODULE_AUTHOR("Kevin Tsai <ktsai@capellamicro.com>");
539MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
540MODULE_LICENSE("GPL");