This patch adds support for Spreadtrum SC27xx series PMIC MFD core, and It
provides communication through the SPI interfaces. The SC27xx series PMICs
contains the following 6 major components:
- DCDCs
- LDOs
- Battery management system
- Audio codec
- User interface function, such as indicator, flash LED
- IC level function, such as power on/off, type-c
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxx>
---
Changes since v1:
- Re-order the including head files.
- Add one condition to check register size and value size when reading.
- Fix some coding style issues.
---
drivers/mfd/Kconfig | 10 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/sprd-sc27xx-spi.c | 264 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 275 insertions(+)
create mode 100644 drivers/mfd/sprd-sc27xx-spi.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fc5e4fe..4753cd5 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1057,6 +1057,16 @@ config MFD_SMSC
To compile this driver as a module, choose M here: the
module will be called smsc.
+config MFD_SC27XX_PMIC
+ tristate "Spreadtrum SC27xx PMICs"
+ depends on ARCH_SPRD || COMPILE_TEST
+ depends on SPI_MASTER
+ select MFD_CORE
+ select REGMAP_SPI
+ select REGMAP_IRQ
+ help
+ This enables support for the Spreadtrum SC27xx PMICs.
+
config ABX500_CORE
bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
default y if ARCH_U300 || ARCH_U8500 || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c3d0a1b..a377e0f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -226,3 +226,4 @@ obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
obj-$(CONFIG_MFD_STM32_LPTIMER) += stm32-lptimer.o
obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
+obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
new file mode 100644
index 0000000..eb7ff5f
--- /dev/null
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#define SPRD_PMIC_INT_MASK_STATUS 0x0
+#define SPRD_PMIC_INT_RAW_STATU 0x4
+#define SPRD_PMIC_INT_EN 0x8
+
+struct sprd_pmic {
+ struct regmap *regmap;
+ struct device *dev;
+ struct regmap_irq *irqs;
+ struct regmap_irq_chip irq_chip;
+ struct regmap_irq_chip_data *irq_data;
+ int irq;
+};
+
+struct sprd_pmic_data {
+ u32 irq_base;
+ u32 num_irqs;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different interrupt
+ * base address and irq number, we should save irq number and irq base
+ * in the device data structure.
+ */
+static const struct sprd_pmic_data sc2731_data = {
+ .irq_base = 0x140,
+ .num_irqs = 16,
+};
+
+static const struct mfd_cell sprd_pmic_devs[] = {
+ {
+ .name = "sc27xx-wdt",
+ .of_compatible = "sprd,sc27xx-wdt",
+ }, {
+ .name = "sc27xx-rtc",
+ .of_compatible = "sprd,sc27xx-rtc",
+ }, {
+ .name = "sc27xx-charger",
+ .of_compatible = "sprd,sc27xx-charger",
+ }, {
+ .name = "sc27xx-chg-timer",
+ .of_compatible = "sprd,sc27xx-chg-timer",
+ }, {
+ .name = "sc27xx-fast-chg",
+ .of_compatible = "sprd,sc27xx-fast-chg",
+ }, {
+ .name = "sc27xx-chg-wdt",
+ .of_compatible = "sprd,sc27xx-chg-wdt",
+ }, {
+ .name = "sc27xx-typec",
+ .of_compatible = "sprd,sc27xx-typec",
+ }, {
+ .name = "sc27xx-flash",
+ .of_compatible = "sprd,sc27xx-flash",
+ }, {
+ .name = "sc27xx-eic",
+ .of_compatible = "sprd,sc27xx-eic",
+ }, {
+ .name = "sc27xx-efuse",
+ .of_compatible = "sprd,sc27xx-efuse",
+ }, {
+ .name = "sc27xx-thermal",
+ .of_compatible = "sprd,sc27xx-thermal",
+ }, {
+ .name = "sc27xx-adc",
+ .of_compatible = "sprd,sc27xx-adc",
+ }, {
+ .name = "sc27xx-audio-codec",
+ .of_compatible = "sprd,sc27xx-audio-codec",
+ }, {
+ .name = "sc27xx-regulator",
+ .of_compatible = "sprd,sc27xx-regulator",
+ }, {
+ .name = "sc27xx-vibrator",
+ .of_compatible = "sprd,sc27xx-vibrator",
+ }, {
+ .name = "sc27xx-keypad-led",
+ .of_compatible = "sprd,sc27xx-keypad-led",
+ }, {
+ .name = "sc27xx-bltc",
+ .of_compatible = "sprd,sc27xx-bltc",
+ }, {
+ .name = "sc27xx-fgu",
+ .of_compatible = "sprd,sc27xx-fgu",
+ }, {
+ .name = "sc27xx-7sreset",
+ .of_compatible = "sprd,sc27xx-7sreset",
+ }, {
+ .name = "sc27xx-poweroff",
+ .of_compatible = "sprd,sc27xx-poweroff",
+ },
+};
+
+static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write(spi, data, count);
+}
+
+static int sprd_pmic_spi_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u32 rx_buf[2] = { 0 };
+ int ret;
+
+ /* Now we only support one PMIC register to read every time. */
+ if (reg_size != sizeof(u32) || val_size != sizeof(u32))
+ return -EINVAL;
+
+ rx_buf[0] = *(u32 *)reg;
+ ret = spi_read(spi, rx_buf, 1);
+ if (ret < 0)
+ return ret;
+
+ memcpy(val, rx_buf, val_size);
+ return 0;
+}
+
+static struct regmap_bus sprd_pmic_regmap = {
+ .write = sprd_pmic_spi_write,
+ .read = sprd_pmic_spi_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static const struct regmap_config sprd_pmic_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0xffff,
+};
+
+static int sprd_pmic_probe(struct spi_device *spi)
+{
+ struct sprd_pmic *sprd_pmic;
+ const struct sprd_pmic_data *data;
+ int ret, i;
+
+ data = of_device_get_match_data(&spi->dev);
+ if (!data) {
+ dev_err(&spi->dev, "No matching driver data found\n");
+ return -EINVAL;
+ }
+
+ sprd_pmic = devm_kzalloc(&spi->dev, sizeof(*sprd_pmic), GFP_KERNEL);
+ if (!sprd_pmic)
+ return -ENOMEM;
+
+ sprd_pmic->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
+ &spi->dev, &sprd_pmic_config);
+ if (IS_ERR(sprd_pmic->regmap)) {
+ ret = PTR_ERR(sprd_pmic->regmap);
+ dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
+ return ret;
+ }
+
+ spi_set_drvdata(spi, sprd_pmic);
+ sprd_pmic->dev = &spi->dev;
+ sprd_pmic->irq = spi->irq;
+
+ sprd_pmic->irq_chip.name = dev_name(&spi->dev);
+ sprd_pmic->irq_chip.status_base =
+ data->irq_base + SPRD_PMIC_INT_MASK_STATUS;
+ sprd_pmic->irq_chip.mask_base = data->irq_base + SPRD_PMIC_INT_EN;
+ sprd_pmic->irq_chip.ack_base = 0;
+ sprd_pmic->irq_chip.num_regs = 1;
+ sprd_pmic->irq_chip.num_irqs = data->num_irqs;
+ sprd_pmic->irq_chip.mask_invert = true;
+
+ sprd_pmic->irqs = devm_kzalloc(&spi->dev, sizeof(struct regmap_irq) *
+ data->num_irqs, GFP_KERNEL);
+ if (!sprd_pmic->irqs)
+ return -ENOMEM;
+
+ sprd_pmic->irq_chip.irqs = sprd_pmic->irqs;
+ for (i = 0; i < data->num_irqs; i++) {
+ sprd_pmic->irqs[i].reg_offset = i / data->num_irqs;
+ sprd_pmic->irqs[i].mask = BIT(i % data->num_irqs);
+ }
+
+ ret = devm_regmap_add_irq_chip(&spi->dev, sprd_pmic->regmap,
+ sprd_pmic->irq,
+ IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
+ &sprd_pmic->irq_chip,
+ &sprd_pmic->irq_data);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
+ return ret;
+ }
+
+ ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO, sprd_pmic_devs,
+ ARRAY_SIZE(sprd_pmic_devs), NULL, 0,
+ regmap_irq_get_domain(sprd_pmic->irq_data));
+ if (ret) {
+ dev_err(&spi->dev, "Failed to register device %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int sprd_pmic_remove(struct spi_device *spi)
+{
+ mfd_remove_devices(&spi->dev);
+
+ return 0;
+}
+
+static const struct of_device_id sprd_pmic_match[] = {
+ { .compatible = "sprd,sc2731", .data = &sc2731_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sprd_pmic_match);
+
+static struct spi_driver sprd_pmic_driver = {
+ .driver = {
+ .name = "sc27xx-pmic",
+ .bus = &spi_bus_type,
+ .of_match_table = sprd_pmic_match,
+ },
+ .probe = sprd_pmic_probe,
+ .remove = sprd_pmic_remove,
+};
+
+static int __init sprd_pmic_init(void)
+{
+ return spi_register_driver(&sprd_pmic_driver);
+}
+subsys_initcall(sprd_pmic_init);
+
+static void __exit sprd_pmic_exit(void)
+{
+ spi_unregister_driver(&sprd_pmic_driver);
+}
+module_exit(sprd_pmic_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SPI support for SC27xx PMICs");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@xxxxxxxxxxxxxx>");
--
1.7.9.5
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