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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
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(regmap, reg, &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(virq);
55 int irq_base = regmap_irq_chip_get_base(d);
56
57 return cpcap_sense_irq(regmap, 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(&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
90
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 .ack_invert = 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 .ack_invert = 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 .ack_invert = 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_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
169static 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
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 regmap_config cpcap_regmap_config = {
206 .reg_bits = 16,
207 .reg_stride = 4,
208 .pad_bits = 0,
209 .val_bits = 16,
210 .write_flag_mask = 0x8000,
211 .max_register = CPCAP_REG_ST_TEST2,
212 .cache_type = REGCACHE_NONE,
213 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
214 .val_format_endian = REGMAP_ENDIAN_LITTLE,
215};
216
217static const struct mfd_cell cpcap_mfd_devices[] = {
218 {
219 .name = "cpcap_adc",
220 .of_compatible = "motorola,mapphone-cpcap-adc",
221 }, {
222 .name = "cpcap_battery",
223 .of_compatible = "motorola,cpcap-battery",
224 }, {
225 .name = "cpcap-charger",
226 .of_compatible = "motorola,mapphone-cpcap-charger",
227 }, {
228 .name = "cpcap-regulator",
229 .of_compatible = "motorola,mapphone-cpcap-regulator",
230 }, {
231 .name = "cpcap-rtc",
232 .of_compatible = "motorola,cpcap-rtc",
233 }, {
234 .name = "cpcap-pwrbutton",
235 .of_compatible = "motorola,cpcap-pwrbutton",
236 }, {
237 .name = "cpcap-usb-phy",
238 .of_compatible = "motorola,mapphone-cpcap-usb-phy",
239 }, {
240 .name = "cpcap-led",
241 .id = 0,
242 .of_compatible = "motorola,cpcap-led-red",
243 }, {
244 .name = "cpcap-led",
245 .id = 1,
246 .of_compatible = "motorola,cpcap-led-green",
247 }, {
248 .name = "cpcap-led",
249 .id = 2,
250 .of_compatible = "motorola,cpcap-led-blue",
251 }, {
252 .name = "cpcap-led",
253 .id = 3,
254 .of_compatible = "motorola,cpcap-led-adl",
255 }, {
256 .name = "cpcap-led",
257 .id = 4,
258 .of_compatible = "motorola,cpcap-led-cp",
259 }, {
260 .name = "cpcap-codec",
261 }
262};
263
264static int cpcap_probe(struct spi_device *spi)
265{
266 const struct of_device_id *match;
267 struct cpcap_ddata *cpcap;
268 int ret;
269
270 match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
271 if (!match)
272 return -ENODEV;
273
274 cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
275 if (!cpcap)
276 return -ENOMEM;
277
278 cpcap->spi = spi;
279 spi_set_drvdata(spi, cpcap);
280
281 spi->bits_per_word = 16;
282 spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
283
284 ret = spi_setup(spi);
285 if (ret)
286 return ret;
287
288 cpcap->regmap_conf = &cpcap_regmap_config;
289 cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
290 if (IS_ERR(cpcap->regmap)) {
291 ret = PTR_ERR(cpcap->regmap);
292 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
293 ret);
294
295 return ret;
296 }
297
298 ret = cpcap_check_revision(cpcap);
299 if (ret) {
300 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
301 return ret;
302 }
303
304 ret = cpcap_init_irq(cpcap);
305 if (ret)
306 return ret;
307
308 return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
309 ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
310}
311
312static struct spi_driver cpcap_driver = {
313 .driver = {
314 .name = "cpcap-core",
315 .of_match_table = cpcap_of_match,
316 },
317 .probe = cpcap_probe,
318};
319module_spi_driver(cpcap_driver);
320
321MODULE_ALIAS("platform:cpcap");
322MODULE_DESCRIPTION("CPCAP driver");
323MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
324MODULE_LICENSE("GPL v2");
325
