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