353 lines
8.1 KiB
C
353 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Motorola CPCAP PMIC core driver
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*
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* Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/regmap.h>
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#include <linux/sysfs.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/motorola-cpcap.h>
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#include <linux/spi/spi.h>
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#define CPCAP_NR_IRQ_REG_BANKS 6
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#define CPCAP_NR_IRQ_CHIPS 3
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#define CPCAP_REGISTER_SIZE 4
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#define CPCAP_REGISTER_BITS 16
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struct cpcap_ddata {
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struct spi_device *spi;
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struct regmap_irq *irqs;
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struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
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const struct regmap_config *regmap_conf;
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struct regmap *regmap;
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};
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static int cpcap_sense_irq(struct regmap *regmap, int irq)
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{
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int regnum = irq / CPCAP_REGISTER_BITS;
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int mask = BIT(irq % CPCAP_REGISTER_BITS);
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int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
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int err, val;
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if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
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return -EINVAL;
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err = regmap_read(regmap, reg, &val);
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if (err)
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return err;
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return !!(val & mask);
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}
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int cpcap_sense_virq(struct regmap *regmap, int virq)
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{
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struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
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int irq_base = regmap_irq_chip_get_base(d);
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return cpcap_sense_irq(regmap, virq - irq_base);
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}
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EXPORT_SYMBOL_GPL(cpcap_sense_virq);
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static int cpcap_check_revision(struct cpcap_ddata *cpcap)
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{
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u16 vendor, rev;
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int ret;
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ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
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if (ret)
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return ret;
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ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
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if (ret)
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return ret;
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dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
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vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
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CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
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rev);
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if (rev < CPCAP_REVISION_2_1) {
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dev_info(&cpcap->spi->dev,
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"Please add old CPCAP revision support as needed\n");
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return -ENODEV;
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}
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return 0;
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}
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/*
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* First two irq chips are the two private macro interrupt chips, the third
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* irq chip is for register banks 1 - 4 and is available for drivers to use.
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*/
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static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
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{
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.name = "cpcap-m2",
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.num_regs = 1,
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.status_base = CPCAP_REG_MI1,
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.ack_base = CPCAP_REG_MI1,
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.mask_base = CPCAP_REG_MIM1,
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.use_ack = true,
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.clear_ack = true,
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},
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{
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.name = "cpcap-m2",
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.num_regs = 1,
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.status_base = CPCAP_REG_MI2,
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.ack_base = CPCAP_REG_MI2,
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.mask_base = CPCAP_REG_MIM2,
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.use_ack = true,
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.clear_ack = true,
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},
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{
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.name = "cpcap1-4",
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.num_regs = 4,
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.status_base = CPCAP_REG_INT1,
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.ack_base = CPCAP_REG_INT1,
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.mask_base = CPCAP_REG_INTM1,
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.use_ack = true,
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.clear_ack = true,
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},
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};
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static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
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struct regmap_irq *rirq,
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int irq_base, int irq)
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{
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unsigned int reg_offset;
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unsigned int bit, mask;
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reg_offset = irq - irq_base;
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reg_offset /= cpcap->regmap_conf->val_bits;
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reg_offset *= cpcap->regmap_conf->reg_stride;
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bit = irq % cpcap->regmap_conf->val_bits;
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mask = (1 << bit);
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rirq->reg_offset = reg_offset;
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rirq->mask = mask;
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}
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static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
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int irq_start, int nr_irqs)
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{
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struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
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int i, ret;
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for (i = irq_start; i < irq_start + nr_irqs; i++) {
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struct regmap_irq *rirq = &cpcap->irqs[i];
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cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
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}
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chip->irqs = &cpcap->irqs[irq_start];
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chip->num_irqs = nr_irqs;
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chip->irq_drv_data = cpcap;
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ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
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cpcap->spi->irq,
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irq_get_trigger_type(cpcap->spi->irq) |
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IRQF_SHARED, -1,
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chip, &cpcap->irqdata[irq_chip]);
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if (ret) {
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dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
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irq_chip, ret);
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return ret;
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}
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return 0;
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}
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static int cpcap_init_irq(struct cpcap_ddata *cpcap)
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{
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int ret;
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cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
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array3_size(sizeof(*cpcap->irqs),
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CPCAP_NR_IRQ_REG_BANKS,
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cpcap->regmap_conf->val_bits),
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GFP_KERNEL);
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if (!cpcap->irqs)
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return -ENOMEM;
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ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
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if (ret)
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return ret;
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ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
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if (ret)
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return ret;
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ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
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if (ret)
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return ret;
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enable_irq_wake(cpcap->spi->irq);
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return 0;
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}
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static const struct of_device_id cpcap_of_match[] = {
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{ .compatible = "motorola,cpcap", },
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{ .compatible = "st,6556002", },
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{},
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};
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MODULE_DEVICE_TABLE(of, cpcap_of_match);
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static const struct spi_device_id cpcap_spi_ids[] = {
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{ .name = "cpcap", },
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{ .name = "6556002", },
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{},
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};
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MODULE_DEVICE_TABLE(spi, cpcap_spi_ids);
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static const struct regmap_config cpcap_regmap_config = {
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.reg_bits = 16,
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.reg_stride = 4,
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.pad_bits = 0,
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.val_bits = 16,
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.write_flag_mask = 0x8000,
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.max_register = CPCAP_REG_ST_TEST2,
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.cache_type = REGCACHE_NONE,
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.reg_format_endian = REGMAP_ENDIAN_LITTLE,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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};
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static int cpcap_suspend(struct device *dev)
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{
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struct spi_device *spi = to_spi_device(dev);
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disable_irq(spi->irq);
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return 0;
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}
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static int cpcap_resume(struct device *dev)
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{
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struct spi_device *spi = to_spi_device(dev);
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enable_irq(spi->irq);
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return 0;
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
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static const struct mfd_cell cpcap_mfd_devices[] = {
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{
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.name = "cpcap_adc",
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.of_compatible = "motorola,mapphone-cpcap-adc",
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}, {
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.name = "cpcap_battery",
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.of_compatible = "motorola,cpcap-battery",
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}, {
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.name = "cpcap-charger",
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.of_compatible = "motorola,mapphone-cpcap-charger",
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}, {
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.name = "cpcap-regulator",
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.of_compatible = "motorola,mapphone-cpcap-regulator",
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}, {
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.name = "cpcap-rtc",
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.of_compatible = "motorola,cpcap-rtc",
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}, {
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.name = "cpcap-pwrbutton",
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.of_compatible = "motorola,cpcap-pwrbutton",
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}, {
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.name = "cpcap-usb-phy",
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.of_compatible = "motorola,mapphone-cpcap-usb-phy",
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}, {
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.name = "cpcap-led",
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.id = 0,
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.of_compatible = "motorola,cpcap-led-red",
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}, {
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.name = "cpcap-led",
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.id = 1,
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.of_compatible = "motorola,cpcap-led-green",
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}, {
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.name = "cpcap-led",
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.id = 2,
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.of_compatible = "motorola,cpcap-led-blue",
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}, {
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.name = "cpcap-led",
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.id = 3,
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.of_compatible = "motorola,cpcap-led-adl",
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}, {
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.name = "cpcap-led",
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.id = 4,
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.of_compatible = "motorola,cpcap-led-cp",
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}, {
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.name = "cpcap-codec",
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}
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};
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static int cpcap_probe(struct spi_device *spi)
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{
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struct cpcap_ddata *cpcap;
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int ret;
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cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
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if (!cpcap)
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return -ENOMEM;
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cpcap->spi = spi;
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spi_set_drvdata(spi, cpcap);
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spi->bits_per_word = 16;
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spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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cpcap->regmap_conf = &cpcap_regmap_config;
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cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
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if (IS_ERR(cpcap->regmap)) {
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ret = PTR_ERR(cpcap->regmap);
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dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
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ret);
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return ret;
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}
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ret = cpcap_check_revision(cpcap);
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if (ret) {
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dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
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return ret;
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}
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ret = cpcap_init_irq(cpcap);
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if (ret)
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return ret;
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/* Parent SPI controller uses DMA, CPCAP and child devices do not */
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spi->dev.coherent_dma_mask = 0;
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spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
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return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
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ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
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}
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static struct spi_driver cpcap_driver = {
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.driver = {
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.name = "cpcap-core",
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.of_match_table = cpcap_of_match,
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.pm = pm_sleep_ptr(&cpcap_pm),
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},
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.probe = cpcap_probe,
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.id_table = cpcap_spi_ids,
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};
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module_spi_driver(cpcap_driver);
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MODULE_ALIAS("platform:cpcap");
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MODULE_DESCRIPTION("CPCAP driver");
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MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
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MODULE_LICENSE("GPL v2");
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