summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/pmbus/adm1266.c
blob: ec5f932fc6f0fb6d489418f25beaa1816710759e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
// SPDX-License-Identifier: GPL-2.0
/*
 * ADM1266 - Cascadable Super Sequencer with Margin
 * Control and Fault Recording
 *
 * Copyright 2020 Analog Devices Inc.
 */

#include <linux/bitfield.h>
#include <linux/crc8.h>
#include <linux/debugfs.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/nvmem-provider.h>
#include "pmbus.h"
#include <linux/slab.h>
#include <linux/timekeeping.h>

#define ADM1266_BLACKBOX_CONFIG	0xD3
#define ADM1266_PDIO_CONFIG	0xD4
#define ADM1266_READ_STATE	0xD9
#define ADM1266_READ_BLACKBOX	0xDE
#define ADM1266_SET_RTC		0xDF
#define ADM1266_GPIO_CONFIG	0xE1
#define ADM1266_BLACKBOX_INFO	0xE6
#define ADM1266_PDIO_STATUS	0xE9
#define ADM1266_GPIO_STATUS	0xEA

/* ADM1266 GPIO defines */
#define ADM1266_GPIO_NR			9
#define ADM1266_GPIO_FUNCTIONS(x)	FIELD_GET(BIT(0), x)
#define ADM1266_GPIO_INPUT_EN(x)	FIELD_GET(BIT(2), x)
#define ADM1266_GPIO_OUTPUT_EN(x)	FIELD_GET(BIT(3), x)
#define ADM1266_GPIO_OPEN_DRAIN(x)	FIELD_GET(BIT(4), x)

/* ADM1266 PDIO defines */
#define ADM1266_PDIO_NR			16
#define ADM1266_PDIO_PIN_CFG(x)		FIELD_GET(GENMASK(15, 13), x)
#define ADM1266_PDIO_GLITCH_FILT(x)	FIELD_GET(GENMASK(12, 9), x)
#define ADM1266_PDIO_OUT_CFG(x)		FIELD_GET(GENMASK(2, 0), x)

#define ADM1266_BLACKBOX_OFFSET		0
#define ADM1266_BLACKBOX_SIZE		64

#define ADM1266_PMBUS_BLOCK_MAX		255

struct adm1266_data {
	struct pmbus_driver_info info;
	struct gpio_chip gc;
	const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
	struct i2c_client *client;
	struct dentry *debugfs_dir;
	struct nvmem_config nvmem_config;
	struct nvmem_device *nvmem;
	u8 *dev_mem;
	struct mutex buf_mutex;
	u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
	u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
};

static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
	{
		.name           = "blackbox",
		.offset         = ADM1266_BLACKBOX_OFFSET,
		.bytes          = 2048,
	},
};

DECLARE_CRC8_TABLE(pmbus_crc_table);

/*
 * Different from Block Read as it sends data and waits for the slave to
 * return a value dependent on that data. The protocol is simply a Write Block
 * followed by a Read Block without the Read-Block command field and the
 * Write-Block STOP bit.
 */
static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len, u8 *data_w,
				    u8 *data_r)
{
	struct i2c_client *client = data->client;
	struct i2c_msg msgs[2] = {
		{
			.addr = client->addr,
			.flags = I2C_M_DMA_SAFE,
			.buf = data->write_buf,
			.len = w_len + 2,
		},
		{
			.addr = client->addr,
			.flags = I2C_M_RD | I2C_M_DMA_SAFE,
			.buf = data->read_buf,
			.len = ADM1266_PMBUS_BLOCK_MAX + 2,
		}
	};
	u8 addr;
	u8 crc;
	int ret;

	mutex_lock(&data->buf_mutex);

	msgs[0].buf[0] = cmd;
	msgs[0].buf[1] = w_len;
	memcpy(&msgs[0].buf[2], data_w, w_len);

	ret = i2c_transfer(client->adapter, msgs, 2);
	if (ret != 2) {
		if (ret >= 0)
			ret = -EPROTO;

		mutex_unlock(&data->buf_mutex);

		return ret;
	}

	if (client->flags & I2C_CLIENT_PEC) {
		addr = i2c_8bit_addr_from_msg(&msgs[0]);
		crc = crc8(pmbus_crc_table, &addr, 1, 0);
		crc = crc8(pmbus_crc_table, msgs[0].buf,  msgs[0].len, crc);

		addr = i2c_8bit_addr_from_msg(&msgs[1]);
		crc = crc8(pmbus_crc_table, &addr, 1, crc);
		crc = crc8(pmbus_crc_table, msgs[1].buf,  msgs[1].buf[0] + 1, crc);

		if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) {
			mutex_unlock(&data->buf_mutex);
			return -EBADMSG;
		}
	}

	memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);

	ret = msgs[1].buf[0];
	mutex_unlock(&data->buf_mutex);

	return ret;
}

static const unsigned int adm1266_gpio_mapping[ADM1266_GPIO_NR][2] = {
	{1, 0},
	{2, 1},
	{3, 2},
	{4, 8},
	{5, 9},
	{6, 10},
	{7, 11},
	{8, 6},
	{9, 7},
};

static const char *adm1266_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR] = {
	"GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7", "GPIO8",
	"GPIO9", "PDIO1", "PDIO2", "PDIO3", "PDIO4", "PDIO5", "PDIO6",
	"PDIO7", "PDIO8", "PDIO9", "PDIO10", "PDIO11", "PDIO12", "PDIO13",
	"PDIO14", "PDIO15", "PDIO16",
};

static int adm1266_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct adm1266_data *data = gpiochip_get_data(chip);
	u8 read_buf[I2C_SMBUS_BLOCK_MAX + 1];
	unsigned long pins_status;
	unsigned int pmbus_cmd;
	int ret;

	if (offset < ADM1266_GPIO_NR)
		pmbus_cmd = ADM1266_GPIO_STATUS;
	else
		pmbus_cmd = ADM1266_PDIO_STATUS;

	ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf);
	if (ret < 0)
		return ret;

	pins_status = read_buf[0] + (read_buf[1] << 8);
	if (offset < ADM1266_GPIO_NR)
		return test_bit(adm1266_gpio_mapping[offset][1], &pins_status);

	return test_bit(offset - ADM1266_GPIO_NR, &pins_status);
}

static int adm1266_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
				     unsigned long *bits)
{
	struct adm1266_data *data = gpiochip_get_data(chip);
	u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
	unsigned long status;
	unsigned int gpio_nr;
	int ret;

	ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf);
	if (ret < 0)
		return ret;

	status = read_buf[0] + (read_buf[1] << 8);

	*bits = 0;
	for_each_set_bit(gpio_nr, mask, ADM1266_GPIO_NR) {
		if (test_bit(adm1266_gpio_mapping[gpio_nr][1], &status))
			set_bit(gpio_nr, bits);
	}

	ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, read_buf);
	if (ret < 0)
		return ret;

	status = read_buf[0] + (read_buf[1] << 8);

	*bits = 0;
	for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {
		if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status))
			set_bit(gpio_nr, bits);
	}

	return 0;
}

static void adm1266_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct adm1266_data *data = gpiochip_get_data(chip);
	u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
	unsigned long gpio_config;
	unsigned long pdio_config;
	unsigned long pin_cfg;
	u8 write_cmd;
	int ret;
	int i;

	for (i = 0; i < ADM1266_GPIO_NR; i++) {
		write_cmd = adm1266_gpio_mapping[i][1];
		ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf);
		if (ret != 2)
			return;

		gpio_config = read_buf[0];
		seq_puts(s, adm1266_names[i]);

		seq_puts(s, " ( ");
		if (!ADM1266_GPIO_FUNCTIONS(gpio_config)) {
			seq_puts(s, "high-Z )\n");
			continue;
		}
		if (ADM1266_GPIO_INPUT_EN(gpio_config))
			seq_puts(s, "input ");
		if (ADM1266_GPIO_OUTPUT_EN(gpio_config))
			seq_puts(s, "output ");
		if (ADM1266_GPIO_OPEN_DRAIN(gpio_config))
			seq_puts(s, "open-drain )\n");
		else
			seq_puts(s, "push-pull )\n");
	}

	write_cmd = 0xFF;
	ret = adm1266_pmbus_block_xfer(data, ADM1266_PDIO_CONFIG, 1, &write_cmd, read_buf);
	if (ret != 32)
		return;

	for (i = 0; i < ADM1266_PDIO_NR; i++) {
		seq_puts(s, adm1266_names[ADM1266_GPIO_NR + i]);

		pdio_config = read_buf[2 * i];
		pdio_config += (read_buf[2 * i + 1] << 8);
		pin_cfg = ADM1266_PDIO_PIN_CFG(pdio_config);

		seq_puts(s, " ( ");
		if (!pin_cfg || pin_cfg > 5) {
			seq_puts(s, "high-Z )\n");
			continue;
		}

		if (pin_cfg & BIT(0))
			seq_puts(s, "output ");

		if (pin_cfg & BIT(1))
			seq_puts(s, "input ");

		seq_puts(s, ")\n");
	}
}

static int adm1266_config_gpio(struct adm1266_data *data)
{
	const char *name = dev_name(&data->client->dev);
	char *gpio_name;
	int ret;
	int i;

	for (i = 0; i < ARRAY_SIZE(data->gpio_names); i++) {
		gpio_name = devm_kasprintf(&data->client->dev, GFP_KERNEL, "adm1266-%x-%s",
					   data->client->addr, adm1266_names[i]);
		if (!gpio_name)
			return -ENOMEM;

		data->gpio_names[i] = gpio_name;
	}

	data->gc.label = name;
	data->gc.parent = &data->client->dev;
	data->gc.owner = THIS_MODULE;
	data->gc.base = -1;
	data->gc.names = data->gpio_names;
	data->gc.ngpio = ARRAY_SIZE(data->gpio_names);
	data->gc.get = adm1266_gpio_get;
	data->gc.get_multiple = adm1266_gpio_get_multiple;
	data->gc.dbg_show = adm1266_gpio_dbg_show;

	ret = devm_gpiochip_add_data(&data->client->dev, &data->gc, data);
	if (ret)
		dev_err(&data->client->dev, "GPIO registering failed (%d)\n", ret);

	return ret;
}

static int adm1266_state_read(struct seq_file *s, void *pdata)
{
	struct device *dev = s->private;
	struct i2c_client *client = to_i2c_client(dev);
	int ret;

	ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE);
	if (ret < 0)
		return ret;

	seq_printf(s, "%d\n", ret);

	return 0;
}

static void adm1266_init_debugfs(struct adm1266_data *data)
{
	struct dentry *root;

	root = pmbus_get_debugfs_dir(data->client);
	if (!root)
		return;

	data->debugfs_dir = debugfs_create_dir(data->client->name, root);
	if (!data->debugfs_dir)
		return;

	debugfs_create_devm_seqfile(&data->client->dev, "sequencer_state", data->debugfs_dir,
				    adm1266_state_read);
}

static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff)
{
	int record_count;
	char index;
	u8 buf[5];
	int ret;

	ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf);
	if (ret < 0)
		return ret;

	if (ret != 4)
		return -EIO;

	record_count = buf[3];

	for (index = 0; index < record_count; index++) {
		ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);
		if (ret < 0)
			return ret;

		if (ret != ADM1266_BLACKBOX_SIZE)
			return -EIO;

		read_buff += ADM1266_BLACKBOX_SIZE;
	}

	return 0;
}

static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
	struct adm1266_data *data = priv;
	int ret;

	if (offset + bytes > data->nvmem_config.size)
		return -EINVAL;

	if (offset == 0) {
		memset(data->dev_mem, 0, data->nvmem_config.size);

		ret = adm1266_nvmem_read_blackbox(data, data->dev_mem);
		if (ret) {
			dev_err(&data->client->dev, "Could not read blackbox!");
			return ret;
		}
	}

	memcpy(val, data->dev_mem + offset, bytes);

	return 0;
}

static int adm1266_config_nvmem(struct adm1266_data *data)
{
	data->nvmem_config.name = dev_name(&data->client->dev);
	data->nvmem_config.dev = &data->client->dev;
	data->nvmem_config.root_only = true;
	data->nvmem_config.read_only = true;
	data->nvmem_config.owner = THIS_MODULE;
	data->nvmem_config.reg_read = adm1266_nvmem_read;
	data->nvmem_config.cells = adm1266_nvmem_cells;
	data->nvmem_config.ncells = ARRAY_SIZE(adm1266_nvmem_cells);
	data->nvmem_config.priv = data;
	data->nvmem_config.stride = 1;
	data->nvmem_config.word_size = 1;
	data->nvmem_config.size = adm1266_nvmem_cells[0].bytes;

	data->dev_mem = devm_kzalloc(&data->client->dev, data->nvmem_config.size, GFP_KERNEL);
	if (!data->dev_mem)
		return -ENOMEM;

	data->nvmem = devm_nvmem_register(&data->client->dev, &data->nvmem_config);
	if (IS_ERR(data->nvmem)) {
		dev_err(&data->client->dev, "Could not register nvmem!");
		return PTR_ERR(data->nvmem);
	}

	return 0;
}

static int adm1266_set_rtc(struct adm1266_data *data)
{
	time64_t kt;
	char write_buf[6];
	int i;

	kt = ktime_get_seconds();

	memset(write_buf, 0, sizeof(write_buf));

	for (i = 0; i < 4; i++)
		write_buf[2 + i] = (kt >> (i * 8)) & 0xFF;

	return i2c_smbus_write_block_data(data->client, ADM1266_SET_RTC, sizeof(write_buf),
					  write_buf);
}

static int adm1266_probe(struct i2c_client *client)
{
	struct adm1266_data *data;
	int ret;
	int i;

	data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	data->info.pages = 17;
	data->info.format[PSC_VOLTAGE_OUT] = linear;
	for (i = 0; i < data->info.pages; i++)
		data->info.func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;

	crc8_populate_msb(pmbus_crc_table, 0x7);
	mutex_init(&data->buf_mutex);

	ret = adm1266_config_gpio(data);
	if (ret < 0)
		return ret;

	ret = adm1266_set_rtc(data);
	if (ret < 0)
		return ret;

	ret = adm1266_config_nvmem(data);
	if (ret < 0)
		return ret;

	ret = pmbus_do_probe(client, &data->info);
	if (ret)
		return ret;

	adm1266_init_debugfs(data);

	return 0;
}

static const struct of_device_id adm1266_of_match[] = {
	{ .compatible = "adi,adm1266" },
	{ }
};
MODULE_DEVICE_TABLE(of, adm1266_of_match);

static const struct i2c_device_id adm1266_id[] = {
	{ "adm1266", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, adm1266_id);

static struct i2c_driver adm1266_driver = {
	.driver = {
		   .name = "adm1266",
		   .of_match_table = adm1266_of_match,
		  },
	.probe_new = adm1266_probe,
	.id_table = adm1266_id,
};

module_i2c_driver(adm1266_driver);

MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(PMBUS);