1 files changed, 243 insertions, 0 deletions

diff --git a/drivers/mfd/max14577.c b/drivers/mfd/max14577.c
new file mode 100644
index 000000000000..94b766d8cb15
--- /dev/null
+++ b/drivers/mfd/max14577.c
@@ -0,0 +1,243 @@
+/*
+ * max14577.c - mfd core driver for the Maxim 14577
+ *
+ * Copyright (C) 2013 Samsung Electrnoics
+ * Chanwoo Choi <cw00.choi@samsung.com>
+ * Krzysztof Kozlowski <k.kozlowski@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * This driver is based on max8997.c
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max14577.h>
+#include <linux/mfd/max14577-private.h>
+
+static struct mfd_cell max14577_devs[] = {
+        { .name = "max14577-muic", },
+        { .name = "max14577-regulator", },
+        { .name = "max14577-charger", },
+};
+
+static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
+                return true;
+        default:
+                break;
+        }
+        return false;
+}
+
+static const struct regmap_config max14577_regmap_config = {
+        .reg_bits       = 8,
+        .val_bits       = 8,
+        .volatile_reg   = max14577_volatile_reg,
+        .max_register   = MAX14577_REG_END,
+};
+
+static const struct regmap_irq max14577_irqs[] = {
+        /* INT1 interrupts */
+        { .reg_offset = 0, .mask = INT1_ADC_MASK, },
+        { .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
+        { .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
+        /* INT2 interrupts */
+        { .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
+        { .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
+        { .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
+        { .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
+        { .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
+        /* INT3 interrupts */
+        { .reg_offset = 2, .mask = INT3_EOC_MASK, },
+        { .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
+        { .reg_offset = 2, .mask = INT3_OVP_MASK, },
+        { .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
+};
+
+static const struct regmap_irq_chip max14577_irq_chip = {
+        .name                   = "max14577",
+        .status_base            = MAX14577_REG_INT1,
+        .mask_base              = MAX14577_REG_INTMASK1,
+        .mask_invert            = 1,
+        .num_regs               = 3,
+        .irqs                   = max14577_irqs,
+        .num_irqs               = ARRAY_SIZE(max14577_irqs),
+};
+
+static int max14577_i2c_probe(struct i2c_client *i2c,
+                              const struct i2c_device_id *id)
+{
+        struct max14577 *max14577;
+        struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
+        struct device_node *np = i2c->dev.of_node;
+        u8 reg_data;
+        int ret = 0;
+
+        if (np) {
+                pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
+                if (!pdata)
+                        return -ENOMEM;
+                i2c->dev.platform_data = pdata;
+        }
+
+        if (!pdata) {
+                dev_err(&i2c->dev, "No platform data found: %ld\n",
+                                PTR_ERR(pdata));
+                return -EINVAL;
+        }
+
+        max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
+        if (!max14577)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, max14577);
+        max14577->dev = &i2c->dev;
+        max14577->i2c = i2c;
+        max14577->irq = i2c->irq;
+
+        max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
+        if (IS_ERR(max14577->regmap)) {
+                ret = PTR_ERR(max14577->regmap);
+                dev_err(max14577->dev, "Failed to allocate register map: %d\n",
+                                ret);
+                return ret;
+        }
+
+        ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
+                        &reg_data);
+        if (ret) {
+                dev_err(max14577->dev, "Device not found on this channel: %d\n",
+                                ret);
+                return ret;
+        }
+        max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
+                                DEVID_VENDORID_SHIFT);
+        max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
+                                DEVID_DEVICEID_SHIFT);
+        dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
+                        max14577->device_id, max14577->vendor_id);
+
+        ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
+                                  IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
+                                  &max14577_irq_chip,
+                                  &max14577->irq_data);
+        if (ret != 0) {
+                dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
+                                max14577->irq, ret);
+                return ret;
+        }
+
+        ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
+                        ARRAY_SIZE(max14577_devs), NULL, 0,
+                        regmap_irq_get_domain(max14577->irq_data));
+        if (ret < 0)
+                goto err_mfd;
+
+        device_init_wakeup(max14577->dev, 1);
+
+        return 0;
+
+err_mfd:
+        regmap_del_irq_chip(max14577->irq, max14577->irq_data);
+
+        return ret;
+}
+
+static int max14577_i2c_remove(struct i2c_client *i2c)
+{
+        struct max14577 *max14577 = i2c_get_clientdata(i2c);
+
+        mfd_remove_devices(max14577->dev);
+        regmap_del_irq_chip(max14577->irq, max14577->irq_data);
+
+        return 0;
+}
+
+static const struct i2c_device_id max14577_i2c_id[] = {
+        { "max14577", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
+
+static int max14577_suspend(struct device *dev)
+{
+        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+        struct max14577 *max14577 = i2c_get_clientdata(i2c);
+
+        if (device_may_wakeup(dev)) {
+                enable_irq_wake(max14577->irq);
+                /*
+                 * MUIC IRQ must be disabled during suspend if this is
+                 * a wake up source because it will be handled before
+                 * resuming I2C.
+                 *
+                 * When device is woken up from suspend (e.g. by ADC change),
+                 * an interrupt occurs before resuming I2C bus controller.
+                 * Interrupt handler tries to read registers but this read
+                 * will fail because I2C is still suspended.
+                 */
+                disable_irq(max14577->irq);
+        }
+
+        return 0;
+}
+
+static int max14577_resume(struct device *dev)
+{
+        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+        struct max14577 *max14577 = i2c_get_clientdata(i2c);
+
+        if (device_may_wakeup(dev)) {
+                disable_irq_wake(max14577->irq);
+                enable_irq(max14577->irq);
+        }
+
+        return 0;
+}
+
+static struct of_device_id max14577_dt_match[] = {
+        { .compatible = "maxim,max14577", },
+        {},
+};
+
+static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
+
+static struct i2c_driver max14577_i2c_driver = {
+        .driver = {
+                .name = "max14577",
+                .owner = THIS_MODULE,
+                .pm = &max14577_pm,
+                .of_match_table = of_match_ptr(max14577_dt_match),
+        },
+        .probe = max14577_i2c_probe,
+        .remove = max14577_i2c_remove,
+        .id_table = max14577_i2c_id,
+};
+
+static int __init max14577_i2c_init(void)
+{
+        return i2c_add_driver(&max14577_i2c_driver);
+}
+subsys_initcall(max14577_i2c_init);
+
+static void __exit max14577_i2c_exit(void)
+{
+        i2c_del_driver(&max14577_i2c_driver);
+}
+module_exit(max14577_i2c_exit);
+
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
+MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
+MODULE_LICENSE("GPL");