summaryrefslogtreecommitdiff
path: root/drivers/mfd/motorola-cpcap.c
blob: d8243b956f875df31a92834049e1aad7b1cdb77b (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Motorola CPCAP PMIC core driver
 *
 * Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/regmap.h>
#include <linux/sysfs.h>

#include <linux/mfd/core.h>
#include <linux/mfd/motorola-cpcap.h>
#include <linux/spi/spi.h>

#define CPCAP_NR_IRQ_REG_BANKS	6
#define CPCAP_NR_IRQ_CHIPS	3
#define CPCAP_REGISTER_SIZE	4
#define CPCAP_REGISTER_BITS	16

struct cpcap_ddata {
	struct spi_device *spi;
	struct regmap_irq *irqs;
	struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
	const struct regmap_config *regmap_conf;
	struct regmap *regmap;
};

static int cpcap_sense_irq(struct regmap *regmap, int irq)
{
	int regnum = irq / CPCAP_REGISTER_BITS;
	int mask = BIT(irq % CPCAP_REGISTER_BITS);
	int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
	int err, val;

	if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
		return -EINVAL;

	err = regmap_read(regmap, reg, &val);
	if (err)
		return err;

	return !!(val & mask);
}

int cpcap_sense_virq(struct regmap *regmap, int virq)
{
	struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
	int irq_base = regmap_irq_chip_get_base(d);

	return cpcap_sense_irq(regmap, virq - irq_base);
}
EXPORT_SYMBOL_GPL(cpcap_sense_virq);

static int cpcap_check_revision(struct cpcap_ddata *cpcap)
{
	u16 vendor, rev;
	int ret;

	ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
	if (ret)
		return ret;

	ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
	if (ret)
		return ret;

	dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
		 vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
		 CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
		 rev);

	if (rev < CPCAP_REVISION_2_1) {
		dev_info(&cpcap->spi->dev,
			 "Please add old CPCAP revision support as needed\n");
		return -ENODEV;
	}

	return 0;
}

/*
 * First two irq chips are the two private macro interrupt chips, the third
 * irq chip is for register banks 1 - 4 and is available for drivers to use.
 */
static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
	{
		.name = "cpcap-m2",
		.num_regs = 1,
		.status_base = CPCAP_REG_MI1,
		.ack_base = CPCAP_REG_MI1,
		.mask_base = CPCAP_REG_MIM1,
		.use_ack = true,
		.clear_ack = true,
	},
	{
		.name = "cpcap-m2",
		.num_regs = 1,
		.status_base = CPCAP_REG_MI2,
		.ack_base = CPCAP_REG_MI2,
		.mask_base = CPCAP_REG_MIM2,
		.use_ack = true,
		.clear_ack = true,
	},
	{
		.name = "cpcap1-4",
		.num_regs = 4,
		.status_base = CPCAP_REG_INT1,
		.ack_base = CPCAP_REG_INT1,
		.mask_base = CPCAP_REG_INTM1,
		.use_ack = true,
		.clear_ack = true,
	},
};

static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
				      struct regmap_irq *rirq,
				      int irq_base, int irq)
{
	unsigned int reg_offset;
	unsigned int bit, mask;

	reg_offset = irq - irq_base;
	reg_offset /= cpcap->regmap_conf->val_bits;
	reg_offset *= cpcap->regmap_conf->reg_stride;

	bit = irq % cpcap->regmap_conf->val_bits;
	mask = (1 << bit);

	rirq->reg_offset = reg_offset;
	rirq->mask = mask;
}

static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
			       int irq_start, int nr_irqs)
{
	struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
	int i, ret;

	for (i = irq_start; i < irq_start + nr_irqs; i++) {
		struct regmap_irq *rirq = &cpcap->irqs[i];

		cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
	}
	chip->irqs = &cpcap->irqs[irq_start];
	chip->num_irqs = nr_irqs;
	chip->irq_drv_data = cpcap;

	ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
				       cpcap->spi->irq,
				       irq_get_trigger_type(cpcap->spi->irq) |
				       IRQF_SHARED, -1,
				       chip, &cpcap->irqdata[irq_chip]);
	if (ret) {
		dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
			irq_chip, ret);
		return ret;
	}

	return 0;
}

static int cpcap_init_irq(struct cpcap_ddata *cpcap)
{
	int ret;

	cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
				   array3_size(sizeof(*cpcap->irqs),
					       CPCAP_NR_IRQ_REG_BANKS,
					       cpcap->regmap_conf->val_bits),
				   GFP_KERNEL);
	if (!cpcap->irqs)
		return -ENOMEM;

	ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
	if (ret)
		return ret;

	ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
	if (ret)
		return ret;

	ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
	if (ret)
		return ret;

	enable_irq_wake(cpcap->spi->irq);

	return 0;
}

static const struct of_device_id cpcap_of_match[] = {
	{ .compatible = "motorola,cpcap", },
	{ .compatible = "st,6556002", },
	{},
};
MODULE_DEVICE_TABLE(of, cpcap_of_match);

static const struct spi_device_id cpcap_spi_ids[] = {
	{ .name = "cpcap", },
	{ .name = "6556002", },
	{},
};
MODULE_DEVICE_TABLE(spi, cpcap_spi_ids);

static const struct regmap_config cpcap_regmap_config = {
	.reg_bits = 16,
	.reg_stride = 4,
	.pad_bits = 0,
	.val_bits = 16,
	.write_flag_mask = 0x8000,
	.max_register = CPCAP_REG_ST_TEST2,
	.cache_type = REGCACHE_NONE,
	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
};

static int cpcap_suspend(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);

	disable_irq(spi->irq);

	return 0;
}

static int cpcap_resume(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);

	enable_irq(spi->irq);

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);

static const struct mfd_cell cpcap_mfd_devices[] = {
	{
		.name          = "cpcap_adc",
		.of_compatible = "motorola,mapphone-cpcap-adc",
	}, {
		.name          = "cpcap_battery",
		.of_compatible = "motorola,cpcap-battery",
	}, {
		.name          = "cpcap-charger",
		.of_compatible = "motorola,mapphone-cpcap-charger",
	}, {
		.name          = "cpcap-regulator",
		.of_compatible = "motorola,mapphone-cpcap-regulator",
	}, {
		.name          = "cpcap-rtc",
		.of_compatible = "motorola,cpcap-rtc",
	}, {
		.name          = "cpcap-pwrbutton",
		.of_compatible = "motorola,cpcap-pwrbutton",
	}, {
		.name          = "cpcap-usb-phy",
		.of_compatible = "motorola,mapphone-cpcap-usb-phy",
	}, {
		.name          = "cpcap-led",
		.id            = 0,
		.of_compatible = "motorola,cpcap-led-red",
	}, {
		.name          = "cpcap-led",
		.id            = 1,
		.of_compatible = "motorola,cpcap-led-green",
	}, {
		.name          = "cpcap-led",
		.id            = 2,
		.of_compatible = "motorola,cpcap-led-blue",
	}, {
		.name          = "cpcap-led",
		.id            = 3,
		.of_compatible = "motorola,cpcap-led-adl",
	}, {
		.name          = "cpcap-led",
		.id            = 4,
		.of_compatible = "motorola,cpcap-led-cp",
	}, {
		.name          = "cpcap-codec",
	}
};

static int cpcap_probe(struct spi_device *spi)
{
	struct cpcap_ddata *cpcap;
	int ret;

	cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
	if (!cpcap)
		return -ENOMEM;

	cpcap->spi = spi;
	spi_set_drvdata(spi, cpcap);

	spi->bits_per_word = 16;
	spi->mode = SPI_MODE_0 | SPI_CS_HIGH;

	ret = spi_setup(spi);
	if (ret)
		return ret;

	cpcap->regmap_conf = &cpcap_regmap_config;
	cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
	if (IS_ERR(cpcap->regmap)) {
		ret = PTR_ERR(cpcap->regmap);
		dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
			ret);

		return ret;
	}

	ret = cpcap_check_revision(cpcap);
	if (ret) {
		dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
		return ret;
	}

	ret = cpcap_init_irq(cpcap);
	if (ret)
		return ret;

	/* Parent SPI controller uses DMA, CPCAP and child devices do not */
	spi->dev.coherent_dma_mask = 0;
	spi->dev.dma_mask = &spi->dev.coherent_dma_mask;

	return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
				    ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
}

static struct spi_driver cpcap_driver = {
	.driver = {
		.name = "cpcap-core",
		.of_match_table = cpcap_of_match,
		.pm = pm_sleep_ptr(&cpcap_pm),
	},
	.probe = cpcap_probe,
	.id_table = cpcap_spi_ids,
};
module_spi_driver(cpcap_driver);

MODULE_ALIAS("platform:cpcap");
MODULE_DESCRIPTION("CPCAP driver");
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_LICENSE("GPL v2");