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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
56e1d40d TL |
2 | /* |
3 | * Motorola CPCAP PMIC core driver | |
4 | * | |
5 | * Copyright (C) 2016 Tony Lindgren <tony@atomide.com> | |
56e1d40d TL |
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 | ||
86f955d2 | 18 | #include <linux/mfd/core.h> |
56e1d40d TL |
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 | |
ab781ec0 SR |
24 | #define CPCAP_REGISTER_SIZE 4 |
25 | #define CPCAP_REGISTER_BITS 16 | |
56e1d40d TL |
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 | ||
ab781ec0 SR |
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 | ||
56e1d40d TL |
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, | |
5a88d412 | 100 | .ack_invert = true, |
56e1d40d TL |
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, | |
5a88d412 | 109 | .ack_invert = true, |
56e1d40d TL |
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, | |
56e1d40d | 117 | .use_ack = true, |
5a88d412 | 118 | .ack_invert = true, |
56e1d40d TL |
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, | |
ac894732 | 157 | irq_get_trigger_type(cpcap->spi->irq) | |
56e1d40d TL |
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, | |
a86854d0 KC |
174 | array3_size(sizeof(*cpcap->irqs), |
175 | CPCAP_NR_IRQ_REG_BANKS, | |
176 | cpcap->regmap_conf->val_bits), | |
56e1d40d TL |
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 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 | ||
86f955d2 SR |
217 | static 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 | ||
56e1d40d TL |
264 | static 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 | ||
86f955d2 SR |
308 | return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices, |
309 | ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL); | |
56e1d40d TL |
310 | } |
311 | ||
312 | static struct spi_driver cpcap_driver = { | |
313 | .driver = { | |
314 | .name = "cpcap-core", | |
315 | .of_match_table = cpcap_of_match, | |
316 | }, | |
317 | .probe = cpcap_probe, | |
56e1d40d TL |
318 | }; |
319 | module_spi_driver(cpcap_driver); | |
320 | ||
321 | MODULE_ALIAS("platform:cpcap"); | |
322 | MODULE_DESCRIPTION("CPCAP driver"); | |
323 | MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); | |
324 | MODULE_LICENSE("GPL v2"); |