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path: root/drivers/mfd/max14577.c
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Diffstat (limited to 'drivers/mfd/max14577.c')
-rw-r--r--drivers/mfd/max14577.c245
1 files changed, 245 insertions, 0 deletions
diff --git a/drivers/mfd/max14577.c b/drivers/mfd/max14577.c
new file mode 100644
index 00000000000..ac514fb2b87
--- /dev/null
+++ b/drivers/mfd/max14577.c
@@ -0,0 +1,245 @@
+/*
+ * 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",
+ .of_compatible = "maxim,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.\n");
+ 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 = 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");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-12 01:40:44 +0000