GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / motorola-cpcap.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Motorola CPCAP PMIC core driver
4  *
5  * Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
6  */
7
8 #include <linux/device.h>
9 #include <linux/err.h>
10 #include <linux/interrupt.h>
11 #include <linux/irq.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/regmap.h>
16 #include <linux/sysfs.h>
17
18 #include <linux/mfd/core.h>
19 #include <linux/mfd/motorola-cpcap.h>
20 #include <linux/spi/spi.h>
21
22 #define CPCAP_NR_IRQ_REG_BANKS  6
23 #define CPCAP_NR_IRQ_CHIPS      3
24 #define CPCAP_REGISTER_SIZE     4
25 #define CPCAP_REGISTER_BITS     16
26
27 struct cpcap_ddata {
28         struct spi_device *spi;
29         struct regmap_irq *irqs;
30         struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
31         const struct regmap_config *regmap_conf;
32         struct regmap *regmap;
33 };
34
35 static int cpcap_sense_irq(struct regmap *regmap, int irq)
36 {
37         int regnum = irq / CPCAP_REGISTER_BITS;
38         int mask = BIT(irq % CPCAP_REGISTER_BITS);
39         int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
40         int err, val;
41
42         if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
43                 return -EINVAL;
44
45         err = regmap_read(regmap, reg, &val);
46         if (err)
47                 return err;
48
49         return !!(val & mask);
50 }
51
52 int cpcap_sense_virq(struct regmap *regmap, int virq)
53 {
54         struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
55         int irq_base = regmap_irq_chip_get_base(d);
56
57         return cpcap_sense_irq(regmap, virq - irq_base);
58 }
59 EXPORT_SYMBOL_GPL(cpcap_sense_virq);
60
61 static int cpcap_check_revision(struct cpcap_ddata *cpcap)
62 {
63         u16 vendor, rev;
64         int ret;
65
66         ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
67         if (ret)
68                 return ret;
69
70         ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
71         if (ret)
72                 return ret;
73
74         dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
75                  vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
76                  CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
77                  rev);
78
79         if (rev < CPCAP_REVISION_2_1) {
80                 dev_info(&cpcap->spi->dev,
81                          "Please add old CPCAP revision support as needed\n");
82                 return -ENODEV;
83         }
84
85         return 0;
86 }
87
88 /*
89  * First two irq chips are the two private macro interrupt chips, the third
90  * irq chip is for register banks 1 - 4 and is available for drivers to use.
91  */
92 static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
93         {
94                 .name = "cpcap-m2",
95                 .num_regs = 1,
96                 .status_base = CPCAP_REG_MI1,
97                 .ack_base = CPCAP_REG_MI1,
98                 .mask_base = CPCAP_REG_MIM1,
99                 .use_ack = true,
100                 .clear_ack = true,
101         },
102         {
103                 .name = "cpcap-m2",
104                 .num_regs = 1,
105                 .status_base = CPCAP_REG_MI2,
106                 .ack_base = CPCAP_REG_MI2,
107                 .mask_base = CPCAP_REG_MIM2,
108                 .use_ack = true,
109                 .clear_ack = true,
110         },
111         {
112                 .name = "cpcap1-4",
113                 .num_regs = 4,
114                 .status_base = CPCAP_REG_INT1,
115                 .ack_base = CPCAP_REG_INT1,
116                 .mask_base = CPCAP_REG_INTM1,
117                 .use_ack = true,
118                 .clear_ack = true,
119         },
120 };
121
122 static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
123                                       struct regmap_irq *rirq,
124                                       int irq_base, int irq)
125 {
126         unsigned int reg_offset;
127         unsigned int bit, mask;
128
129         reg_offset = irq - irq_base;
130         reg_offset /= cpcap->regmap_conf->val_bits;
131         reg_offset *= cpcap->regmap_conf->reg_stride;
132
133         bit = irq % cpcap->regmap_conf->val_bits;
134         mask = (1 << bit);
135
136         rirq->reg_offset = reg_offset;
137         rirq->mask = mask;
138 }
139
140 static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
141                                int irq_start, int nr_irqs)
142 {
143         struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
144         int i, ret;
145
146         for (i = irq_start; i < irq_start + nr_irqs; i++) {
147                 struct regmap_irq *rirq = &cpcap->irqs[i];
148
149                 cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
150         }
151         chip->irqs = &cpcap->irqs[irq_start];
152         chip->num_irqs = nr_irqs;
153         chip->irq_drv_data = cpcap;
154
155         ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
156                                        cpcap->spi->irq,
157                                        irq_get_trigger_type(cpcap->spi->irq) |
158                                        IRQF_SHARED, -1,
159                                        chip, &cpcap->irqdata[irq_chip]);
160         if (ret) {
161                 dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
162                         irq_chip, ret);
163                 return ret;
164         }
165
166         return 0;
167 }
168
169 static int cpcap_init_irq(struct cpcap_ddata *cpcap)
170 {
171         int ret;
172
173         cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
174                                    array3_size(sizeof(*cpcap->irqs),
175                                                CPCAP_NR_IRQ_REG_BANKS,
176                                                cpcap->regmap_conf->val_bits),
177                                    GFP_KERNEL);
178         if (!cpcap->irqs)
179                 return -ENOMEM;
180
181         ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
182         if (ret)
183                 return ret;
184
185         ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
186         if (ret)
187                 return ret;
188
189         ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
190         if (ret)
191                 return ret;
192
193         enable_irq_wake(cpcap->spi->irq);
194
195         return 0;
196 }
197
198 static const struct of_device_id cpcap_of_match[] = {
199         { .compatible = "motorola,cpcap", },
200         { .compatible = "st,6556002", },
201         {},
202 };
203 MODULE_DEVICE_TABLE(of, cpcap_of_match);
204
205 static const struct spi_device_id cpcap_spi_ids[] = {
206         { .name = "cpcap", },
207         { .name = "6556002", },
208         {},
209 };
210 MODULE_DEVICE_TABLE(spi, cpcap_spi_ids);
211
212 static const struct regmap_config cpcap_regmap_config = {
213         .reg_bits = 16,
214         .reg_stride = 4,
215         .pad_bits = 0,
216         .val_bits = 16,
217         .write_flag_mask = 0x8000,
218         .max_register = CPCAP_REG_ST_TEST2,
219         .cache_type = REGCACHE_NONE,
220         .reg_format_endian = REGMAP_ENDIAN_LITTLE,
221         .val_format_endian = REGMAP_ENDIAN_LITTLE,
222 };
223
224 #ifdef CONFIG_PM_SLEEP
225 static int cpcap_suspend(struct device *dev)
226 {
227         struct spi_device *spi = to_spi_device(dev);
228
229         disable_irq(spi->irq);
230
231         return 0;
232 }
233
234 static int cpcap_resume(struct device *dev)
235 {
236         struct spi_device *spi = to_spi_device(dev);
237
238         enable_irq(spi->irq);
239
240         return 0;
241 }
242 #endif
243
244 static SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
245
246 static const struct mfd_cell cpcap_mfd_devices[] = {
247         {
248                 .name          = "cpcap_adc",
249                 .of_compatible = "motorola,mapphone-cpcap-adc",
250         }, {
251                 .name          = "cpcap_battery",
252                 .of_compatible = "motorola,cpcap-battery",
253         }, {
254                 .name          = "cpcap-charger",
255                 .of_compatible = "motorola,mapphone-cpcap-charger",
256         }, {
257                 .name          = "cpcap-regulator",
258                 .of_compatible = "motorola,mapphone-cpcap-regulator",
259         }, {
260                 .name          = "cpcap-rtc",
261                 .of_compatible = "motorola,cpcap-rtc",
262         }, {
263                 .name          = "cpcap-pwrbutton",
264                 .of_compatible = "motorola,cpcap-pwrbutton",
265         }, {
266                 .name          = "cpcap-usb-phy",
267                 .of_compatible = "motorola,mapphone-cpcap-usb-phy",
268         }, {
269                 .name          = "cpcap-led",
270                 .id            = 0,
271                 .of_compatible = "motorola,cpcap-led-red",
272         }, {
273                 .name          = "cpcap-led",
274                 .id            = 1,
275                 .of_compatible = "motorola,cpcap-led-green",
276         }, {
277                 .name          = "cpcap-led",
278                 .id            = 2,
279                 .of_compatible = "motorola,cpcap-led-blue",
280         }, {
281                 .name          = "cpcap-led",
282                 .id            = 3,
283                 .of_compatible = "motorola,cpcap-led-adl",
284         }, {
285                 .name          = "cpcap-led",
286                 .id            = 4,
287                 .of_compatible = "motorola,cpcap-led-cp",
288         }, {
289                 .name          = "cpcap-codec",
290         }
291 };
292
293 static int cpcap_probe(struct spi_device *spi)
294 {
295         const struct of_device_id *match;
296         struct cpcap_ddata *cpcap;
297         int ret;
298
299         match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
300         if (!match)
301                 return -ENODEV;
302
303         cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
304         if (!cpcap)
305                 return -ENOMEM;
306
307         cpcap->spi = spi;
308         spi_set_drvdata(spi, cpcap);
309
310         spi->bits_per_word = 16;
311         spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
312
313         ret = spi_setup(spi);
314         if (ret)
315                 return ret;
316
317         cpcap->regmap_conf = &cpcap_regmap_config;
318         cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
319         if (IS_ERR(cpcap->regmap)) {
320                 ret = PTR_ERR(cpcap->regmap);
321                 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
322                         ret);
323
324                 return ret;
325         }
326
327         ret = cpcap_check_revision(cpcap);
328         if (ret) {
329                 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
330                 return ret;
331         }
332
333         ret = cpcap_init_irq(cpcap);
334         if (ret)
335                 return ret;
336
337         /* Parent SPI controller uses DMA, CPCAP and child devices do not */
338         spi->dev.coherent_dma_mask = 0;
339         spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
340
341         return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
342                                     ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
343 }
344
345 static struct spi_driver cpcap_driver = {
346         .driver = {
347                 .name = "cpcap-core",
348                 .of_match_table = cpcap_of_match,
349                 .pm = &cpcap_pm,
350         },
351         .probe = cpcap_probe,
352         .id_table = cpcap_spi_ids,
353 };
354 module_spi_driver(cpcap_driver);
355
356 MODULE_ALIAS("platform:cpcap");
357 MODULE_DESCRIPTION("CPCAP driver");
358 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
359 MODULE_LICENSE("GPL v2");