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
cpcap_sense_irq(struct regmap * regmap,int irq)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
cpcap_sense_virq(struct regmap * regmap,int virq)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
cpcap_check_revision(struct cpcap_ddata * cpcap)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
cpcap_init_one_regmap_irq(struct cpcap_ddata * cpcap,struct regmap_irq * rirq,int irq_base,int irq)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
cpcap_init_irq_chip(struct cpcap_ddata * cpcap,int irq_chip,int irq_start,int nr_irqs)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
cpcap_init_irq(struct cpcap_ddata * cpcap)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
cpcap_suspend(struct device * dev)224 static int cpcap_suspend(struct device *dev)
225 {
226 struct spi_device *spi = to_spi_device(dev);
227
228 disable_irq(spi->irq);
229
230 return 0;
231 }
232
cpcap_resume(struct device * dev)233 static int cpcap_resume(struct device *dev)
234 {
235 struct spi_device *spi = to_spi_device(dev);
236
237 enable_irq(spi->irq);
238
239 return 0;
240 }
241
242 static DEFINE_SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
243
244 static const struct mfd_cell cpcap_mfd_devices[] = {
245 {
246 .name = "cpcap_adc",
247 .of_compatible = "motorola,mapphone-cpcap-adc",
248 }, {
249 .name = "cpcap_battery",
250 .of_compatible = "motorola,cpcap-battery",
251 }, {
252 .name = "cpcap-charger",
253 .of_compatible = "motorola,mapphone-cpcap-charger",
254 }, {
255 .name = "cpcap-regulator",
256 .of_compatible = "motorola,mapphone-cpcap-regulator",
257 }, {
258 .name = "cpcap-rtc",
259 .of_compatible = "motorola,cpcap-rtc",
260 }, {
261 .name = "cpcap-pwrbutton",
262 .of_compatible = "motorola,cpcap-pwrbutton",
263 }, {
264 .name = "cpcap-usb-phy",
265 .of_compatible = "motorola,mapphone-cpcap-usb-phy",
266 }, {
267 .name = "cpcap-led",
268 .id = 0,
269 .of_compatible = "motorola,cpcap-led-red",
270 }, {
271 .name = "cpcap-led",
272 .id = 1,
273 .of_compatible = "motorola,cpcap-led-green",
274 }, {
275 .name = "cpcap-led",
276 .id = 2,
277 .of_compatible = "motorola,cpcap-led-blue",
278 }, {
279 .name = "cpcap-led",
280 .id = 3,
281 .of_compatible = "motorola,cpcap-led-adl",
282 }, {
283 .name = "cpcap-led",
284 .id = 4,
285 .of_compatible = "motorola,cpcap-led-cp",
286 }, {
287 .name = "cpcap-codec",
288 }
289 };
290
cpcap_probe(struct spi_device * spi)291 static int cpcap_probe(struct spi_device *spi)
292 {
293 const struct of_device_id *match;
294 struct cpcap_ddata *cpcap;
295 int ret;
296
297 match = of_match_device(cpcap_of_match, &spi->dev);
298 if (!match)
299 return -ENODEV;
300
301 cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
302 if (!cpcap)
303 return -ENOMEM;
304
305 cpcap->spi = spi;
306 spi_set_drvdata(spi, cpcap);
307
308 spi->bits_per_word = 16;
309 spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
310
311 ret = spi_setup(spi);
312 if (ret)
313 return ret;
314
315 cpcap->regmap_conf = &cpcap_regmap_config;
316 cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
317 if (IS_ERR(cpcap->regmap)) {
318 ret = PTR_ERR(cpcap->regmap);
319 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
320 ret);
321
322 return ret;
323 }
324
325 ret = cpcap_check_revision(cpcap);
326 if (ret) {
327 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
328 return ret;
329 }
330
331 ret = cpcap_init_irq(cpcap);
332 if (ret)
333 return ret;
334
335 /* Parent SPI controller uses DMA, CPCAP and child devices do not */
336 spi->dev.coherent_dma_mask = 0;
337 spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
338
339 return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
340 ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
341 }
342
343 static struct spi_driver cpcap_driver = {
344 .driver = {
345 .name = "cpcap-core",
346 .of_match_table = cpcap_of_match,
347 .pm = pm_sleep_ptr(&cpcap_pm),
348 },
349 .probe = cpcap_probe,
350 .id_table = cpcap_spi_ids,
351 };
352 module_spi_driver(cpcap_driver);
353
354 MODULE_ALIAS("platform:cpcap");
355 MODULE_DESCRIPTION("CPCAP driver");
356 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
357 MODULE_LICENSE("GPL v2");
358