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/mod_devicetable.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
27struct 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
35static 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(map: regmap, reg, val: &val);
46 if (err)
47 return err;
48
49 return !!(val & mask);
50}
51
52int cpcap_sense_virq(struct regmap *regmap, int virq)
53{
54 struct regmap_irq_chip_data *d = irq_get_chip_data(irq: virq);
55 int irq_base = regmap_irq_chip_get_base(data: d);
56
57 return cpcap_sense_irq(regmap, irq: virq - irq_base);
58}
59EXPORT_SYMBOL_GPL(cpcap_sense_virq);
60
61static int cpcap_check_revision(struct cpcap_ddata *cpcap)
62{
63 u16 vendor, rev;
64 int ret;
65
66 ret = cpcap_get_vendor(dev: &cpcap->spi->dev, regmap: cpcap->regmap, vendor: &vendor);
67 if (ret)
68 return ret;
69
70 ret = cpcap_get_revision(dev: &cpcap->spi->dev, regmap: cpcap->regmap, revision: &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 */
92static 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
122static 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
140static 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_base: irq_start, irq: 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(dev: &cpcap->spi->dev, map: cpcap->regmap,
156 irq: cpcap->spi->irq,
157 irq_flags: irq_get_trigger_type(irq: cpcap->spi->irq) |
158 IRQF_SHARED, irq_base: -1,
159 chip, data: &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
169static int cpcap_init_irq(struct cpcap_ddata *cpcap)
170{
171 int ret;
172
173 cpcap->irqs = devm_kzalloc(dev: &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, irq_chip: 0, irq_start: 0, nr_irqs: 16);
182 if (ret)
183 return ret;
184
185 ret = cpcap_init_irq_chip(cpcap, irq_chip: 1, irq_start: 16, nr_irqs: 16);
186 if (ret)
187 return ret;
188
189 ret = cpcap_init_irq_chip(cpcap, irq_chip: 2, irq_start: 32, nr_irqs: 64);
190 if (ret)
191 return ret;
192
193 enable_irq_wake(irq: cpcap->spi->irq);
194
195 return 0;
196}
197
198static const struct of_device_id cpcap_of_match[] = {
199 { .compatible = "motorola,cpcap", },
200 { .compatible = "st,6556002", },
201 {},
202};
203MODULE_DEVICE_TABLE(of, cpcap_of_match);
204
205static const struct spi_device_id cpcap_spi_ids[] = {
206 { .name = "cpcap", },
207 { .name = "6556002", },
208 {},
209};
210MODULE_DEVICE_TABLE(spi, cpcap_spi_ids);
211
212static 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
224static int cpcap_suspend(struct device *dev)
225{
226 struct spi_device *spi = to_spi_device(dev);
227
228 disable_irq(irq: spi->irq);
229
230 return 0;
231}
232
233static int cpcap_resume(struct device *dev)
234{
235 struct spi_device *spi = to_spi_device(dev);
236
237 enable_irq(irq: spi->irq);
238
239 return 0;
240}
241
242static DEFINE_SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
243
244static 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
291static int cpcap_probe(struct spi_device *spi)
292{
293 struct cpcap_ddata *cpcap;
294 int ret;
295
296 cpcap = devm_kzalloc(dev: &spi->dev, size: sizeof(*cpcap), GFP_KERNEL);
297 if (!cpcap)
298 return -ENOMEM;
299
300 cpcap->spi = spi;
301 spi_set_drvdata(spi, data: cpcap);
302
303 spi->bits_per_word = 16;
304 spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
305
306 ret = spi_setup(spi);
307 if (ret)
308 return ret;
309
310 cpcap->regmap_conf = &cpcap_regmap_config;
311 cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
312 if (IS_ERR(ptr: cpcap->regmap)) {
313 ret = PTR_ERR(ptr: cpcap->regmap);
314 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
315 ret);
316
317 return ret;
318 }
319
320 ret = cpcap_check_revision(cpcap);
321 if (ret) {
322 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
323 return ret;
324 }
325
326 ret = cpcap_init_irq(cpcap);
327 if (ret)
328 return ret;
329
330 /* Parent SPI controller uses DMA, CPCAP and child devices do not */
331 spi->dev.coherent_dma_mask = 0;
332 spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
333
334 return devm_mfd_add_devices(dev: &spi->dev, id: 0, cells: cpcap_mfd_devices,
335 ARRAY_SIZE(cpcap_mfd_devices), NULL, irq_base: 0, NULL);
336}
337
338static struct spi_driver cpcap_driver = {
339 .driver = {
340 .name = "cpcap-core",
341 .of_match_table = cpcap_of_match,
342 .pm = pm_sleep_ptr(&cpcap_pm),
343 },
344 .probe = cpcap_probe,
345 .id_table = cpcap_spi_ids,
346};
347module_spi_driver(cpcap_driver);
348
349MODULE_ALIAS("platform:cpcap");
350MODULE_DESCRIPTION("CPCAP driver");
351MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
352MODULE_LICENSE("GPL v2");
353

source code of linux/drivers/mfd/motorola-cpcap.c