summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/motorola-cpcap.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mfd/motorola-cpcap.c')
-rw-r--r--drivers/mfd/motorola-cpcap.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/mfd/motorola-cpcap.c b/drivers/mfd/motorola-cpcap.c
new file mode 100644
index 000000000..6fb206da2
--- /dev/null
+++ b/drivers/mfd/motorola-cpcap.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Motorola CPCAP PMIC core driver
+ *
+ * Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/motorola-cpcap.h>
+#include <linux/spi/spi.h>
+
+#define CPCAP_NR_IRQ_REG_BANKS 6
+#define CPCAP_NR_IRQ_CHIPS 3
+#define CPCAP_REGISTER_SIZE 4
+#define CPCAP_REGISTER_BITS 16
+
+struct cpcap_ddata {
+ struct spi_device *spi;
+ struct regmap_irq *irqs;
+ struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
+ const struct regmap_config *regmap_conf;
+ struct regmap *regmap;
+};
+
+static int cpcap_sense_irq(struct regmap *regmap, int irq)
+{
+ int regnum = irq / CPCAP_REGISTER_BITS;
+ int mask = BIT(irq % CPCAP_REGISTER_BITS);
+ int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
+ int err, val;
+
+ if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
+ return -EINVAL;
+
+ err = regmap_read(regmap, reg, &val);
+ if (err)
+ return err;
+
+ return !!(val & mask);
+}
+
+int cpcap_sense_virq(struct regmap *regmap, int virq)
+{
+ struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
+ int irq_base = regmap_irq_chip_get_base(d);
+
+ return cpcap_sense_irq(regmap, virq - irq_base);
+}
+EXPORT_SYMBOL_GPL(cpcap_sense_virq);
+
+static int cpcap_check_revision(struct cpcap_ddata *cpcap)
+{
+ u16 vendor, rev;
+ int ret;
+
+ ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
+ if (ret)
+ return ret;
+
+ ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
+ if (ret)
+ return ret;
+
+ dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
+ vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
+ CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
+ rev);
+
+ if (rev < CPCAP_REVISION_2_1) {
+ dev_info(&cpcap->spi->dev,
+ "Please add old CPCAP revision support as needed\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * First two irq chips are the two private macro interrupt chips, the third
+ * irq chip is for register banks 1 - 4 and is available for drivers to use.
+ */
+static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
+ {
+ .name = "cpcap-m2",
+ .num_regs = 1,
+ .status_base = CPCAP_REG_MI1,
+ .ack_base = CPCAP_REG_MI1,
+ .mask_base = CPCAP_REG_MIM1,
+ .use_ack = true,
+ .clear_ack = true,
+ },
+ {
+ .name = "cpcap-m2",
+ .num_regs = 1,
+ .status_base = CPCAP_REG_MI2,
+ .ack_base = CPCAP_REG_MI2,
+ .mask_base = CPCAP_REG_MIM2,
+ .use_ack = true,
+ .clear_ack = true,
+ },
+ {
+ .name = "cpcap1-4",
+ .num_regs = 4,
+ .status_base = CPCAP_REG_INT1,
+ .ack_base = CPCAP_REG_INT1,
+ .mask_base = CPCAP_REG_INTM1,
+ .use_ack = true,
+ .clear_ack = true,
+ },
+};
+
+static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
+ struct regmap_irq *rirq,
+ int irq_base, int irq)
+{
+ unsigned int reg_offset;
+ unsigned int bit, mask;
+
+ reg_offset = irq - irq_base;
+ reg_offset /= cpcap->regmap_conf->val_bits;
+ reg_offset *= cpcap->regmap_conf->reg_stride;
+
+ bit = irq % cpcap->regmap_conf->val_bits;
+ mask = (1 << bit);
+
+ rirq->reg_offset = reg_offset;
+ rirq->mask = mask;
+}
+
+static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
+ int irq_start, int nr_irqs)
+{
+ struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
+ int i, ret;
+
+ for (i = irq_start; i < irq_start + nr_irqs; i++) {
+ struct regmap_irq *rirq = &cpcap->irqs[i];
+
+ cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
+ }
+ chip->irqs = &cpcap->irqs[irq_start];
+ chip->num_irqs = nr_irqs;
+ chip->irq_drv_data = cpcap;
+
+ ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
+ cpcap->spi->irq,
+ irq_get_trigger_type(cpcap->spi->irq) |
+ IRQF_SHARED, -1,
+ chip, &cpcap->irqdata[irq_chip]);
+ if (ret) {
+ dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
+ irq_chip, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cpcap_init_irq(struct cpcap_ddata *cpcap)
+{
+ int ret;
+
+ cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
+ array3_size(sizeof(*cpcap->irqs),
+ CPCAP_NR_IRQ_REG_BANKS,
+ cpcap->regmap_conf->val_bits),
+ GFP_KERNEL);
+ if (!cpcap->irqs)
+ return -ENOMEM;
+
+ ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
+ if (ret)
+ return ret;
+
+ ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
+ if (ret)
+ return ret;
+
+ ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
+ if (ret)
+ return ret;
+
+ enable_irq_wake(cpcap->spi->irq);
+
+ return 0;
+}
+
+static const struct of_device_id cpcap_of_match[] = {
+ { .compatible = "motorola,cpcap", },
+ { .compatible = "st,6556002", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cpcap_of_match);
+
+static const struct regmap_config cpcap_regmap_config = {
+ .reg_bits = 16,
+ .reg_stride = 4,
+ .pad_bits = 0,
+ .val_bits = 16,
+ .write_flag_mask = 0x8000,
+ .max_register = CPCAP_REG_ST_TEST2,
+ .cache_type = REGCACHE_NONE,
+ .reg_format_endian = REGMAP_ENDIAN_LITTLE,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int cpcap_suspend(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+
+ disable_irq(spi->irq);
+
+ return 0;
+}
+
+static int cpcap_resume(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+
+ enable_irq(spi->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cpcap_pm, cpcap_suspend, cpcap_resume);
+
+static const struct mfd_cell cpcap_mfd_devices[] = {
+ {
+ .name = "cpcap_adc",
+ .of_compatible = "motorola,mapphone-cpcap-adc",
+ }, {
+ .name = "cpcap_battery",
+ .of_compatible = "motorola,cpcap-battery",
+ }, {
+ .name = "cpcap-charger",
+ .of_compatible = "motorola,mapphone-cpcap-charger",
+ }, {
+ .name = "cpcap-regulator",
+ .of_compatible = "motorola,mapphone-cpcap-regulator",
+ }, {
+ .name = "cpcap-rtc",
+ .of_compatible = "motorola,cpcap-rtc",
+ }, {
+ .name = "cpcap-pwrbutton",
+ .of_compatible = "motorola,cpcap-pwrbutton",
+ }, {
+ .name = "cpcap-usb-phy",
+ .of_compatible = "motorola,mapphone-cpcap-usb-phy",
+ }, {
+ .name = "cpcap-led",
+ .id = 0,
+ .of_compatible = "motorola,cpcap-led-red",
+ }, {
+ .name = "cpcap-led",
+ .id = 1,
+ .of_compatible = "motorola,cpcap-led-green",
+ }, {
+ .name = "cpcap-led",
+ .id = 2,
+ .of_compatible = "motorola,cpcap-led-blue",
+ }, {
+ .name = "cpcap-led",
+ .id = 3,
+ .of_compatible = "motorola,cpcap-led-adl",
+ }, {
+ .name = "cpcap-led",
+ .id = 4,
+ .of_compatible = "motorola,cpcap-led-cp",
+ }, {
+ .name = "cpcap-codec",
+ }
+};
+
+static int cpcap_probe(struct spi_device *spi)
+{
+ const struct of_device_id *match;
+ struct cpcap_ddata *cpcap;
+ int ret;
+
+ match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
+ if (!match)
+ return -ENODEV;
+
+ cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
+ if (!cpcap)
+ return -ENOMEM;
+
+ cpcap->spi = spi;
+ spi_set_drvdata(spi, cpcap);
+
+ spi->bits_per_word = 16;
+ spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
+
+ ret = spi_setup(spi);
+ if (ret)
+ return ret;
+
+ cpcap->regmap_conf = &cpcap_regmap_config;
+ cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
+ if (IS_ERR(cpcap->regmap)) {
+ ret = PTR_ERR(cpcap->regmap);
+ dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
+ ret);
+
+ return ret;
+ }
+
+ ret = cpcap_check_revision(cpcap);
+ if (ret) {
+ dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
+ return ret;
+ }
+
+ ret = cpcap_init_irq(cpcap);
+ if (ret)
+ return ret;
+
+ /* Parent SPI controller uses DMA, CPCAP and child devices do not */
+ spi->dev.coherent_dma_mask = 0;
+ spi->dev.dma_mask = &spi->dev.coherent_dma_mask;
+
+ return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
+ ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
+}
+
+static struct spi_driver cpcap_driver = {
+ .driver = {
+ .name = "cpcap-core",
+ .of_match_table = cpcap_of_match,
+ .pm = &cpcap_pm,
+ },
+ .probe = cpcap_probe,
+};
+module_spi_driver(cpcap_driver);
+
+MODULE_ALIAS("platform:cpcap");
+MODULE_DESCRIPTION("CPCAP driver");
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 18:06:59 +0000