summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/tps65090.c
blob: 382a857b0dde56b1438358fad9d52550f65449c8 (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
/*
 * Core driver for TI TPS65090 PMIC family
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65090.h>
#include <linux/regmap.h>
#include <linux/err.h>

#define NUM_INT_REG 2
#define TOTAL_NUM_REG 0x18

/* interrupt status registers */
#define TPS65090_INT_STS	0x0
#define TPS65090_INT_STS2	0x1

/* interrupt mask registers */
#define TPS65090_INT_MSK	0x2
#define TPS65090_INT_MSK2	0x3

struct tps65090_irq_data {
	u8		mask_reg;
	u8		mask_pos;
};

#define TPS65090_IRQ(_reg, _mask_pos)		\
	{					\
		.mask_reg	= (_reg),	\
		.mask_pos	= (_mask_pos),	\
	}

static const struct tps65090_irq_data tps65090_irqs[] = {
	[0]		= TPS65090_IRQ(0, 0),
	[1]		= TPS65090_IRQ(0, 1),
	[2]		= TPS65090_IRQ(0, 2),
	[3]		= TPS65090_IRQ(0, 3),
	[4]		= TPS65090_IRQ(0, 4),
	[5]		= TPS65090_IRQ(0, 5),
	[6]		= TPS65090_IRQ(0, 6),
	[7]		= TPS65090_IRQ(0, 7),
	[8]		= TPS65090_IRQ(1, 0),
	[9]		= TPS65090_IRQ(1, 1),
	[10]		= TPS65090_IRQ(1, 2),
	[11]		= TPS65090_IRQ(1, 3),
	[12]		= TPS65090_IRQ(1, 4),
	[13]		= TPS65090_IRQ(1, 5),
	[14]		= TPS65090_IRQ(1, 6),
	[15]		= TPS65090_IRQ(1, 7),
};

static struct mfd_cell tps65090s[] = {
	{
		.name = "tps65090-pmic",
	},
	{
		.name = "tps65090-regulator",
	},
};

int tps65090_write(struct device *dev, int reg, uint8_t val)
{
	struct tps65090 *tps = dev_get_drvdata(dev);
	return regmap_write(tps->rmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65090_write);

int tps65090_read(struct device *dev, int reg, uint8_t *val)
{
	struct tps65090 *tps = dev_get_drvdata(dev);
	unsigned int temp_val;
	int ret;
	ret = regmap_read(tps->rmap, reg, &temp_val);
	if (!ret)
		*val = temp_val;
	return ret;
}
EXPORT_SYMBOL_GPL(tps65090_read);

int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
{
	struct tps65090 *tps = dev_get_drvdata(dev);
	return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u);
}
EXPORT_SYMBOL_GPL(tps65090_set_bits);

int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
{
	struct tps65090 *tps = dev_get_drvdata(dev);
	return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u);
}
EXPORT_SYMBOL_GPL(tps65090_clr_bits);

static void tps65090_irq_lock(struct irq_data *data)
{
	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);

	mutex_lock(&tps65090->irq_lock);
}

static void tps65090_irq_mask(struct irq_data *irq_data)
{
	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
	unsigned int __irq = irq_data->hwirq;
	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];

	tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
		data->mask_pos);
}

static void tps65090_irq_unmask(struct irq_data *irq_data)
{
	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
	unsigned int __irq = irq_data->irq - tps65090->irq_base;
	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];

	tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
		data->mask_pos);
}

static void tps65090_irq_sync_unlock(struct irq_data *data)
{
	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);

	mutex_unlock(&tps65090->irq_lock);
}

static irqreturn_t tps65090_irq(int irq, void *data)
{
	struct tps65090 *tps65090 = data;
	int ret = 0;
	u8 status, mask;
	unsigned long int acks = 0;
	int i;

	for (i = 0; i < NUM_INT_REG; i++) {
		ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
		if (ret < 0) {
			dev_err(tps65090->dev,
				"failed to read mask reg [addr:%d]\n",
				TPS65090_INT_MSK + i);
			return IRQ_NONE;
		}
		ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
			&status);
		if (ret < 0) {
			dev_err(tps65090->dev,
				"failed to read status reg [addr:%d]\n",
				 TPS65090_INT_STS + i);
			return IRQ_NONE;
		}
		if (status) {
			/* Ack only those interrupts which are not masked */
			status &= (~mask);
			ret = tps65090_write(tps65090->dev,
					TPS65090_INT_STS + i, status);
			if (ret < 0) {
				dev_err(tps65090->dev,
					"failed to write interrupt status\n");
				return IRQ_NONE;
			}
			acks |= (status << (i * 8));
		}
	}

	for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
		handle_nested_irq(tps65090->irq_base + i);
	return acks ? IRQ_HANDLED : IRQ_NONE;
}

static int tps65090_irq_init(struct tps65090 *tps65090, int irq,
	int irq_base)
{
	int i, ret;

	if (!irq_base) {
		dev_err(tps65090->dev, "IRQ base not set\n");
		return -EINVAL;
	}

	mutex_init(&tps65090->irq_lock);

	for (i = 0; i < NUM_INT_REG; i++)
		tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);

	for (i = 0; i < NUM_INT_REG; i++)
		tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);

	tps65090->irq_base = irq_base;
	tps65090->irq_chip.name = "tps65090";
	tps65090->irq_chip.irq_mask = tps65090_irq_mask;
	tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
	tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
	tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;

	for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
		int __irq = i + tps65090->irq_base;
		irq_set_chip_data(__irq, tps65090);
		irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
					 handle_simple_irq);
		irq_set_nested_thread(__irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(__irq, IRQF_VALID);
#endif
	}

	ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
				"tps65090", tps65090);
	if (!ret) {
		device_init_wakeup(tps65090->dev, 1);
		enable_irq_wake(irq);
	}

	return ret;
}

static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
	if (reg == TPS65090_INT_STS)
		return true;
	else
		return false;
}

static const struct regmap_config tps65090_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = TOTAL_NUM_REG,
	.num_reg_defaults_raw = TOTAL_NUM_REG,
	.cache_type = REGCACHE_RBTREE,
	.volatile_reg = is_volatile_reg,
};

static int tps65090_i2c_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	struct tps65090_platform_data *pdata = client->dev.platform_data;
	struct tps65090 *tps65090;
	int ret;

	if (!pdata) {
		dev_err(&client->dev, "tps65090 requires platform data\n");
		return -EINVAL;
	}

	tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
		GFP_KERNEL);
	if (tps65090 == NULL)
		return -ENOMEM;

	tps65090->client = client;
	tps65090->dev = &client->dev;
	i2c_set_clientdata(client, tps65090);

	mutex_init(&tps65090->lock);

	if (client->irq) {
		ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
		if (ret) {
			dev_err(&client->dev, "IRQ init failed with err: %d\n",
				ret);
			goto err_exit;
		}
	}

	tps65090->rmap = devm_regmap_init_i2c(tps65090->client,
					      &tps65090_regmap_config);
	if (IS_ERR(tps65090->rmap)) {
		ret = PTR_ERR(tps65090->rmap);
		dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
		goto err_irq_exit;
	}

	ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
			      ARRAY_SIZE(tps65090s), NULL, 0, NULL);
	if (ret) {
		dev_err(&client->dev, "add mfd devices failed with err: %d\n",
			ret);
		goto err_irq_exit;
	}

	return 0;

err_irq_exit:
	if (client->irq)
		free_irq(client->irq, tps65090);
err_exit:
	return ret;
}

static int tps65090_i2c_remove(struct i2c_client *client)
{
	struct tps65090 *tps65090 = i2c_get_clientdata(client);

	mfd_remove_devices(tps65090->dev);
	if (client->irq)
		free_irq(client->irq, tps65090);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tps65090_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	if (client->irq)
		disable_irq(client->irq);
	return 0;
}

static int tps65090_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	if (client->irq)
		enable_irq(client->irq);
	return 0;
}
#endif

static const struct dev_pm_ops tps65090_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
};

static const struct i2c_device_id tps65090_id_table[] = {
	{ "tps65090", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, tps65090_id_table);

static struct i2c_driver tps65090_driver = {
	.driver	= {
		.name	= "tps65090",
		.owner	= THIS_MODULE,
		.pm	= &tps65090_pm_ops,
	},
	.probe		= tps65090_i2c_probe,
	.remove		= tps65090_i2c_remove,
	.id_table	= tps65090_id_table,
};

static int __init tps65090_init(void)
{
	return i2c_add_driver(&tps65090_driver);
}
subsys_initcall(tps65090_init);

static void __exit tps65090_exit(void)
{
	i2c_del_driver(&tps65090_driver);
}
module_exit(tps65090_exit);

MODULE_DESCRIPTION("TPS65090 core driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud