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Diffstat (limited to 'drivers/mfd/max8998.c')
-rw-r--r--drivers/mfd/max8998.c360
1 files changed, 360 insertions, 0 deletions
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
new file mode 100644
index 000000000..0eb15e611
--- /dev/null
+++ b/drivers/mfd/max8998.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// max8998.c - mfd core driver for the Maxim 8998
+//
+// Copyright (C) 2009-2010 Samsung Electronics
+// Kyungmin Park <kyungmin.park@samsung.com>
+// Marek Szyprowski <m.szyprowski@samsung.com>
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8998.h>
+#include <linux/mfd/max8998-private.h>
+
+#define RTC_I2C_ADDR (0x0c >> 1)
+
+static const struct mfd_cell max8998_devs[] = {
+ {
+ .name = "max8998-pmic",
+ }, {
+ .name = "max8998-rtc",
+ }, {
+ .name = "max8998-battery",
+ },
+};
+
+static const struct mfd_cell lp3974_devs[] = {
+ {
+ .name = "lp3974-pmic",
+ }, {
+ .name = "lp3974-rtc",
+ },
+};
+
+int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_read_byte_data(i2c, reg);
+ mutex_unlock(&max8998->iolock);
+ if (ret < 0)
+ return ret;
+
+ ret &= 0xff;
+ *dest = ret;
+ return 0;
+}
+EXPORT_SYMBOL(max8998_read_reg);
+
+int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
+ mutex_unlock(&max8998->iolock);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(max8998_bulk_read);
+
+int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_write_byte_data(i2c, reg, value);
+ mutex_unlock(&max8998->iolock);
+ return ret;
+}
+EXPORT_SYMBOL(max8998_write_reg);
+
+int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
+ mutex_unlock(&max8998->iolock);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL(max8998_bulk_write);
+
+int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_read_byte_data(i2c, reg);
+ if (ret >= 0) {
+ u8 old_val = ret & 0xff;
+ u8 new_val = (val & mask) | (old_val & (~mask));
+ ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
+ }
+ mutex_unlock(&max8998->iolock);
+ return ret;
+}
+EXPORT_SYMBOL(max8998_update_reg);
+
+#ifdef CONFIG_OF
+static const struct of_device_id max8998_dt_match[] = {
+ { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
+ { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
+ { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
+ {},
+};
+#endif
+
+/*
+ * Only the common platform data elements for max8998 are parsed here from the
+ * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
+ * to parse their own platform data elements from device tree.
+ *
+ * The max8998 platform data structure is instantiated here and the drivers for
+ * the sub-modules need not instantiate another instance while parsing their
+ * platform data.
+ */
+static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
+ struct device *dev)
+{
+ struct max8998_platform_data *pd;
+
+ pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ return ERR_PTR(-ENOMEM);
+
+ pd->ono = irq_of_parse_and_map(dev->of_node, 1);
+
+ /*
+ * ToDo: the 'wakeup' member in the platform data is more of a linux
+ * specfic information. Hence, there is no binding for that yet and
+ * not parsed here.
+ */
+ return pd;
+}
+
+static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ if (i2c->dev.of_node)
+ return (unsigned long)of_device_get_match_data(&i2c->dev);
+
+ return id->driver_data;
+}
+
+static int max8998_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
+ struct max8998_dev *max8998;
+ int ret = 0;
+
+ max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
+ GFP_KERNEL);
+ if (max8998 == NULL)
+ return -ENOMEM;
+
+ if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
+ pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ }
+
+ i2c_set_clientdata(i2c, max8998);
+ max8998->dev = &i2c->dev;
+ max8998->i2c = i2c;
+ max8998->irq = i2c->irq;
+ max8998->type = max8998_i2c_get_driver_data(i2c, id);
+ max8998->pdata = pdata;
+ if (pdata) {
+ max8998->ono = pdata->ono;
+ max8998->irq_base = pdata->irq_base;
+ max8998->wakeup = pdata->wakeup;
+ }
+ mutex_init(&max8998->iolock);
+
+ max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
+ if (IS_ERR(max8998->rtc)) {
+ dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
+ return PTR_ERR(max8998->rtc);
+ }
+ i2c_set_clientdata(max8998->rtc, max8998);
+
+ max8998_irq_init(max8998);
+
+ pm_runtime_set_active(max8998->dev);
+
+ switch (max8998->type) {
+ case TYPE_LP3974:
+ ret = mfd_add_devices(max8998->dev, -1,
+ lp3974_devs, ARRAY_SIZE(lp3974_devs),
+ NULL, 0, NULL);
+ break;
+ case TYPE_MAX8998:
+ ret = mfd_add_devices(max8998->dev, -1,
+ max8998_devs, ARRAY_SIZE(max8998_devs),
+ NULL, 0, NULL);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret < 0)
+ goto err;
+
+ device_init_wakeup(max8998->dev, max8998->wakeup);
+
+ return ret;
+
+err:
+ mfd_remove_devices(max8998->dev);
+ max8998_irq_exit(max8998);
+ i2c_unregister_device(max8998->rtc);
+ return ret;
+}
+
+static const struct i2c_device_id max8998_i2c_id[] = {
+ { "max8998", TYPE_MAX8998 },
+ { "lp3974", TYPE_LP3974},
+ { }
+};
+
+static int max8998_suspend(struct device *dev)
+{
+ struct i2c_client *i2c = to_i2c_client(dev);
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+
+ if (device_may_wakeup(dev))
+ irq_set_irq_wake(max8998->irq, 1);
+ return 0;
+}
+
+static int max8998_resume(struct device *dev)
+{
+ struct i2c_client *i2c = to_i2c_client(dev);
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+
+ if (device_may_wakeup(dev))
+ irq_set_irq_wake(max8998->irq, 0);
+ /*
+ * In LP3974, if IRQ registers are not "read & clear"
+ * when it's set during sleep, the interrupt becomes
+ * disabled.
+ */
+ return max8998_irq_resume(i2c_get_clientdata(i2c));
+}
+
+struct max8998_reg_dump {
+ u8 addr;
+ u8 val;
+};
+#define SAVE_ITEM(x) { .addr = (x), .val = 0x0, }
+static struct max8998_reg_dump max8998_dump[] = {
+ SAVE_ITEM(MAX8998_REG_IRQM1),
+ SAVE_ITEM(MAX8998_REG_IRQM2),
+ SAVE_ITEM(MAX8998_REG_IRQM3),
+ SAVE_ITEM(MAX8998_REG_IRQM4),
+ SAVE_ITEM(MAX8998_REG_STATUSM1),
+ SAVE_ITEM(MAX8998_REG_STATUSM2),
+ SAVE_ITEM(MAX8998_REG_CHGR1),
+ SAVE_ITEM(MAX8998_REG_CHGR2),
+ SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
+ SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
+ SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
+ SAVE_ITEM(MAX8998_REG_ONOFF1),
+ SAVE_ITEM(MAX8998_REG_ONOFF2),
+ SAVE_ITEM(MAX8998_REG_ONOFF3),
+ SAVE_ITEM(MAX8998_REG_ONOFF4),
+ SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
+ SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
+ SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
+ SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
+ SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
+ SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
+ SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
+ SAVE_ITEM(MAX8998_REG_LDO4),
+ SAVE_ITEM(MAX8998_REG_LDO5),
+ SAVE_ITEM(MAX8998_REG_LDO6),
+ SAVE_ITEM(MAX8998_REG_LDO7),
+ SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
+ SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
+ SAVE_ITEM(MAX8998_REG_LDO12),
+ SAVE_ITEM(MAX8998_REG_LDO13),
+ SAVE_ITEM(MAX8998_REG_LDO14),
+ SAVE_ITEM(MAX8998_REG_LDO15),
+ SAVE_ITEM(MAX8998_REG_LDO16),
+ SAVE_ITEM(MAX8998_REG_LDO17),
+ SAVE_ITEM(MAX8998_REG_BKCHR),
+ SAVE_ITEM(MAX8998_REG_LBCNFG1),
+ SAVE_ITEM(MAX8998_REG_LBCNFG2),
+};
+/* Save registers before hibernation */
+static int max8998_freeze(struct device *dev)
+{
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
+ max8998_read_reg(i2c, max8998_dump[i].addr,
+ &max8998_dump[i].val);
+
+ return 0;
+}
+
+/* Restore registers after hibernation */
+static int max8998_restore(struct device *dev)
+{
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
+ max8998_write_reg(i2c, max8998_dump[i].addr,
+ max8998_dump[i].val);
+
+ return 0;
+}
+
+static const struct dev_pm_ops max8998_pm = {
+ .suspend = max8998_suspend,
+ .resume = max8998_resume,
+ .freeze = max8998_freeze,
+ .restore = max8998_restore,
+};
+
+static struct i2c_driver max8998_i2c_driver = {
+ .driver = {
+ .name = "max8998",
+ .pm = &max8998_pm,
+ .suppress_bind_attrs = true,
+ .of_match_table = of_match_ptr(max8998_dt_match),
+ },
+ .probe = max8998_i2c_probe,
+ .id_table = max8998_i2c_id,
+};
+
+static int __init max8998_i2c_init(void)
+{
+ return i2c_add_driver(&max8998_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(max8998_i2c_init);