2 * Motorola CPCAP PMIC core driver
4 * Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
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.
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>
21 #include <linux/mfd/motorola-cpcap.h>
22 #include <linux/spi/spi.h>
24 #define CPCAP_NR_IRQ_REG_BANKS 6
25 #define CPCAP_NR_IRQ_CHIPS 3
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;
35 static int cpcap_check_revision(struct cpcap_ddata *cpcap)
40 ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
44 ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
48 dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
49 vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
50 CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
53 if (rev < CPCAP_REVISION_2_1) {
54 dev_info(&cpcap->spi->dev,
55 "Please add old CPCAP revision support as needed\n");
63 * First two irq chips are the two private macro interrupt chips, the third
64 * irq chip is for register banks 1 - 4 and is available for drivers to use.
66 static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
70 .status_base = CPCAP_REG_MI1,
71 .ack_base = CPCAP_REG_MI1,
72 .mask_base = CPCAP_REG_MIM1,
78 .status_base = CPCAP_REG_MI2,
79 .ack_base = CPCAP_REG_MI2,
80 .mask_base = CPCAP_REG_MIM2,
86 .status_base = CPCAP_REG_INT1,
87 .ack_base = CPCAP_REG_INT1,
88 .mask_base = CPCAP_REG_INTM1,
89 .type_base = CPCAP_REG_INTS1,
94 static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
95 struct regmap_irq *rirq,
96 int irq_base, int irq)
98 unsigned int reg_offset;
99 unsigned int bit, mask;
101 reg_offset = irq - irq_base;
102 reg_offset /= cpcap->regmap_conf->val_bits;
103 reg_offset *= cpcap->regmap_conf->reg_stride;
105 bit = irq % cpcap->regmap_conf->val_bits;
108 rirq->reg_offset = reg_offset;
112 static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
113 int irq_start, int nr_irqs)
115 struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
118 for (i = irq_start; i < irq_start + nr_irqs; i++) {
119 struct regmap_irq *rirq = &cpcap->irqs[i];
121 cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
123 chip->irqs = &cpcap->irqs[irq_start];
124 chip->num_irqs = nr_irqs;
125 chip->irq_drv_data = cpcap;
127 ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
129 IRQF_TRIGGER_RISING |
131 chip, &cpcap->irqdata[irq_chip]);
133 dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
141 static int cpcap_init_irq(struct cpcap_ddata *cpcap)
145 cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
146 sizeof(*cpcap->irqs) *
147 CPCAP_NR_IRQ_REG_BANKS *
148 cpcap->regmap_conf->val_bits,
153 ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
157 ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
161 ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
165 enable_irq_wake(cpcap->spi->irq);
170 static const struct of_device_id cpcap_of_match[] = {
171 { .compatible = "motorola,cpcap", },
172 { .compatible = "st,6556002", },
175 MODULE_DEVICE_TABLE(of, cpcap_of_match);
177 static const struct regmap_config cpcap_regmap_config = {
182 .write_flag_mask = 0x8000,
183 .max_register = CPCAP_REG_ST_TEST2,
184 .cache_type = REGCACHE_NONE,
185 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
186 .val_format_endian = REGMAP_ENDIAN_LITTLE,
189 static int cpcap_probe(struct spi_device *spi)
191 const struct of_device_id *match;
192 struct cpcap_ddata *cpcap;
195 match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
199 cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
204 spi_set_drvdata(spi, cpcap);
206 spi->bits_per_word = 16;
207 spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
209 ret = spi_setup(spi);
213 cpcap->regmap_conf = &cpcap_regmap_config;
214 cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
215 if (IS_ERR(cpcap->regmap)) {
216 ret = PTR_ERR(cpcap->regmap);
217 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
223 ret = cpcap_check_revision(cpcap);
225 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
229 ret = cpcap_init_irq(cpcap);
233 return of_platform_populate(spi->dev.of_node, NULL, NULL,
237 static int cpcap_remove(struct spi_device *pdev)
239 struct cpcap_ddata *cpcap = spi_get_drvdata(pdev);
241 of_platform_depopulate(&cpcap->spi->dev);
246 static struct spi_driver cpcap_driver = {
248 .name = "cpcap-core",
249 .of_match_table = cpcap_of_match,
251 .probe = cpcap_probe,
252 .remove = cpcap_remove,
254 module_spi_driver(cpcap_driver);
256 MODULE_ALIAS("platform:cpcap");
257 MODULE_DESCRIPTION("CPCAP driver");
258 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
259 MODULE_LICENSE("GPL v2");