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Diffstat (limited to 'drivers/mfd/rn5t618.c')
-rw-r--r--drivers/mfd/rn5t618.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
new file mode 100644
index 0000000000..0fe616b2db
--- /dev/null
+++ b/drivers/mfd/rn5t618.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MFD core driver for Ricoh RN5T618 PMIC
+ *
+ * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
+ * Copyright (C) 2016 Toradex AG
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/rn5t618.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell rn5t618_cells[] = {
+ { .name = "rn5t618-regulator" },
+ { .name = "rn5t618-wdt" },
+};
+
+static const struct mfd_cell rc5t619_cells[] = {
+ { .name = "rn5t618-adc" },
+ { .name = "rn5t618-power" },
+ { .name = "rn5t618-regulator" },
+ { .name = "rc5t619-rtc" },
+ { .name = "rn5t618-wdt" },
+};
+
+static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case RN5T618_WATCHDOGCNT:
+ case RN5T618_DCIRQ:
+ case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
+ case RN5T618_ADCCNT3:
+ case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
+ case RN5T618_IR_GPR:
+ case RN5T618_IR_GPF:
+ case RN5T618_MON_IOIN:
+ case RN5T618_INTMON:
+ case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2:
+ case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR:
+ case RN5T618_CHGCTL1:
+ case RN5T618_REGISET1 ... RN5T618_REGISET2:
+ case RN5T618_CHGSTATE:
+ case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI:
+ case RN5T618_GCHGDET:
+ case RN5T618_CONTROL ... RN5T618_CC_AVEREG0:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config rn5t618_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_reg = rn5t618_volatile_reg,
+ .max_register = RN5T618_MAX_REG,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static const struct regmap_irq rc5t619_irqs[] = {
+ REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)),
+ REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)),
+ REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)),
+ REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)),
+ REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)),
+ REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)),
+};
+
+static const struct regmap_irq_chip rc5t619_irq_chip = {
+ .name = "rc5t619",
+ .irqs = rc5t619_irqs,
+ .num_irqs = ARRAY_SIZE(rc5t619_irqs),
+ .num_regs = 1,
+ .status_base = RN5T618_INTMON,
+ .unmask_base = RN5T618_INTEN,
+};
+
+static struct i2c_client *rn5t618_pm_power_off;
+static struct notifier_block rn5t618_restart_handler;
+
+static int rn5t618_irq_init(struct rn5t618 *rn5t618)
+{
+ const struct regmap_irq_chip *irq_chip = NULL;
+ int ret;
+
+ if (!rn5t618->irq)
+ return 0;
+
+ switch (rn5t618->variant) {
+ case RC5T619:
+ irq_chip = &rc5t619_irq_chip;
+ break;
+ default:
+ dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n",
+ (int)rn5t618->variant);
+ return -ENOENT;
+ }
+
+ ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
+ rn5t618->irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ 0, irq_chip, &rn5t618->irq_data);
+ if (ret)
+ dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
+
+ return ret;
+}
+
+static void rn5t618_trigger_poweroff_sequence(bool repower)
+{
+ int ret;
+
+ /* disable automatic repower-on */
+ ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT);
+ if (ret < 0)
+ goto err;
+
+ ret &= ~RN5T618_REPCNT_REPWRON;
+ if (repower)
+ ret |= RN5T618_REPCNT_REPWRON;
+
+ ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
+ RN5T618_REPCNT, (u8)ret);
+ if (ret < 0)
+ goto err;
+
+ /* start power-off sequence */
+ ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT);
+ if (ret < 0)
+ goto err;
+
+ ret |= RN5T618_SLPCNT_SWPWROFF;
+
+ ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off,
+ RN5T618_SLPCNT, (u8)ret);
+ if (ret < 0)
+ goto err;
+
+ return;
+
+err:
+ dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret);
+}
+
+static void rn5t618_power_off(void)
+{
+ rn5t618_trigger_poweroff_sequence(false);
+}
+
+static int rn5t618_restart(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ rn5t618_trigger_poweroff_sequence(true);
+
+ /*
+ * Re-power factor detection on PMIC side is not instant. 1ms
+ * proved to be enough time until reset takes effect.
+ */
+ mdelay(1);
+
+ return NOTIFY_DONE;
+}
+
+static const struct of_device_id rn5t618_of_match[] = {
+ { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
+ { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
+ { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rn5t618_of_match);
+
+static int rn5t618_i2c_probe(struct i2c_client *i2c)
+{
+ const struct of_device_id *of_id;
+ struct rn5t618 *priv;
+ int ret;
+
+ of_id = of_match_device(rn5t618_of_match, &i2c->dev);
+ if (!of_id) {
+ dev_err(&i2c->dev, "Failed to find matching DT ID\n");
+ return -EINVAL;
+ }
+
+ priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, priv);
+ priv->variant = (long)of_id->data;
+ priv->irq = i2c->irq;
+ priv->dev = &i2c->dev;
+
+ priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ ret = PTR_ERR(priv->regmap);
+ dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
+ if (priv->variant == RC5T619)
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
+ rc5t619_cells,
+ ARRAY_SIZE(rc5t619_cells),
+ NULL, 0, NULL);
+ else
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
+ rn5t618_cells,
+ ARRAY_SIZE(rn5t618_cells),
+ NULL, 0, NULL);
+ if (ret) {
+ dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
+ return ret;
+ }
+
+ rn5t618_pm_power_off = i2c;
+ if (of_device_is_system_power_controller(i2c->dev.of_node)) {
+ if (!pm_power_off)
+ pm_power_off = rn5t618_power_off;
+ else
+ dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
+ }
+
+ rn5t618_restart_handler.notifier_call = rn5t618_restart;
+ rn5t618_restart_handler.priority = 192;
+
+ ret = register_restart_handler(&rn5t618_restart_handler);
+ if (ret) {
+ dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
+ return ret;
+ }
+
+ return rn5t618_irq_init(priv);
+}
+
+static void rn5t618_i2c_remove(struct i2c_client *i2c)
+{
+ if (i2c == rn5t618_pm_power_off) {
+ rn5t618_pm_power_off = NULL;
+ pm_power_off = NULL;
+ }
+
+ unregister_restart_handler(&rn5t618_restart_handler);
+}
+
+static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
+{
+ struct rn5t618 *priv = dev_get_drvdata(dev);
+
+ if (priv->irq)
+ disable_irq(priv->irq);
+
+ return 0;
+}
+
+static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
+{
+ struct rn5t618 *priv = dev_get_drvdata(dev);
+
+ if (priv->irq)
+ enable_irq(priv->irq);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
+ rn5t618_i2c_suspend,
+ rn5t618_i2c_resume);
+
+static struct i2c_driver rn5t618_i2c_driver = {
+ .driver = {
+ .name = "rn5t618",
+ .of_match_table = rn5t618_of_match,
+ .pm = &rn5t618_i2c_dev_pm_ops,
+ },
+ .probe = rn5t618_i2c_probe,
+ .remove = rn5t618_i2c_remove,
+};
+
+module_i2c_driver(rn5t618_i2c_driver);
+
+MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
+MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
+MODULE_LICENSE("GPL v2");