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