mfd: Add MAX8907 core driver
The MAX8907 is an I2C-based power-management IC containing voltage
regulators, a reset controller, a real-time clock, and a touch-screen
controller.
The original driver was written by:
* Gyungoh Yoo <jack.yoo@maxim-ic.com>
Various fixes and enhancements by:
* Jin Park <jinyoungp@nvidia.com>
* Tom Cherry <tcherry@nvidia.com>
* Prashant Gaikwad <pgaikwad@nvidia.com>
* Dan Willemsen <dwillemsen@nvidia.com>
* Laxman Dewangan <ldewangan@nvidia.com>
During upstreaming, I (swarren):
* Converted to regmap.
* Converted to regmap-irq.
* Allowed probing from device tree.
* Renamed from max8907c->max8907, since the driver covers at least the
C and B revisions.
* General cleanup.
Signed-off-by: Gyungoh Yoo <jack.yoo@maxim-ic.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> #v3
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d1facef..856ec00 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -476,6 +476,18 @@
additional drivers must be enabled in order to use the functionality
of the device.
+config MFD_MAX8907
+ tristate "Maxim Semiconductor MAX8907 PMIC Support"
+ select MFD_CORE
+ depends on I2C=y && GENERIC_HARDIRQS
+ select REGMAP_I2C
+ select REGMAP_IRQ
+ help
+ Say yes here to support for Maxim Semiconductor MAX8907. This is
+ a Power Management IC. This driver provides common support for
+ accessing the device; additional drivers must be enabled in order
+ to use the functionality of the device.
+
config MFD_MAX8925
bool "Maxim Semiconductor MAX8925 PMIC Support"
depends on I2C=y && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 79dd22d..2a4108d 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -92,6 +92,7 @@
obj-$(CONFIG_MFD_MAX77686) += max77686.o max77686-irq.o
obj-$(CONFIG_MFD_MAX77693) += max77693.o max77693-irq.o
+obj-$(CONFIG_MFD_MAX8907) += max8907.o
max8925-objs := max8925-core.o max8925-i2c.o
obj-$(CONFIG_MFD_MAX8925) += max8925.o
obj-$(CONFIG_MFD_MAX8997) += max8997.o max8997-irq.o
diff --git a/drivers/mfd/max8907.c b/drivers/mfd/max8907.c
new file mode 100644
index 0000000..6497c98
--- /dev/null
+++ b/drivers/mfd/max8907.c
@@ -0,0 +1,331 @@
+/*
+ * max8907.c - mfd driver for MAX8907
+ *
+ * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
+ * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8907.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static struct mfd_cell max8907_cells[] = {
+ { .name = "max8907-regulator", },
+ { .name = "max8907-rtc", },
+};
+
+static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX8907_REG_ON_OFF_IRQ1:
+ case MAX8907_REG_ON_OFF_STAT:
+ case MAX8907_REG_ON_OFF_IRQ2:
+ case MAX8907_REG_CHG_IRQ1:
+ case MAX8907_REG_CHG_IRQ2:
+ case MAX8907_REG_CHG_STAT:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX8907_REG_ON_OFF_IRQ1:
+ case MAX8907_REG_ON_OFF_IRQ2:
+ case MAX8907_REG_CHG_IRQ1:
+ case MAX8907_REG_CHG_IRQ2:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ return !max8907_gen_is_volatile_reg(dev, reg);
+}
+
+static const struct regmap_config max8907_regmap_gen_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_reg = max8907_gen_is_volatile_reg,
+ .precious_reg = max8907_gen_is_precious_reg,
+ .writeable_reg = max8907_gen_is_writeable_reg,
+ .max_register = MAX8907_REG_LDO20VOUT,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ if (reg <= MAX8907_REG_RTC_YEAR2)
+ return true;
+
+ switch (reg) {
+ case MAX8907_REG_RTC_STATUS:
+ case MAX8907_REG_RTC_IRQ:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX8907_REG_RTC_IRQ:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX8907_REG_RTC_STATUS:
+ case MAX8907_REG_RTC_IRQ:
+ return false;
+ default:
+ return true;
+ }
+}
+
+static const struct regmap_config max8907_regmap_rtc_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_reg = max8907_rtc_is_volatile_reg,
+ .precious_reg = max8907_rtc_is_precious_reg,
+ .writeable_reg = max8907_rtc_is_writeable_reg,
+ .max_register = MAX8907_REG_MPL_CNTL,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static const struct regmap_irq max8907_chg_irqs[] = {
+ { .reg_offset = 0, .mask = 1 << 0, },
+ { .reg_offset = 0, .mask = 1 << 1, },
+ { .reg_offset = 0, .mask = 1 << 2, },
+ { .reg_offset = 1, .mask = 1 << 0, },
+ { .reg_offset = 1, .mask = 1 << 1, },
+ { .reg_offset = 1, .mask = 1 << 2, },
+ { .reg_offset = 1, .mask = 1 << 3, },
+ { .reg_offset = 1, .mask = 1 << 4, },
+ { .reg_offset = 1, .mask = 1 << 5, },
+ { .reg_offset = 1, .mask = 1 << 6, },
+ { .reg_offset = 1, .mask = 1 << 7, },
+};
+
+static const struct regmap_irq_chip max8907_chg_irq_chip = {
+ .name = "max8907 chg",
+ .status_base = MAX8907_REG_CHG_IRQ1,
+ .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
+ .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
+ .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
+ .num_regs = 2,
+ .irqs = max8907_chg_irqs,
+ .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
+};
+
+static const struct regmap_irq max8907_on_off_irqs[] = {
+ { .reg_offset = 0, .mask = 1 << 0, },
+ { .reg_offset = 0, .mask = 1 << 1, },
+ { .reg_offset = 0, .mask = 1 << 2, },
+ { .reg_offset = 0, .mask = 1 << 3, },
+ { .reg_offset = 0, .mask = 1 << 4, },
+ { .reg_offset = 0, .mask = 1 << 5, },
+ { .reg_offset = 0, .mask = 1 << 6, },
+ { .reg_offset = 0, .mask = 1 << 7, },
+ { .reg_offset = 1, .mask = 1 << 0, },
+ { .reg_offset = 1, .mask = 1 << 1, },
+};
+
+static const struct regmap_irq_chip max8907_on_off_irq_chip = {
+ .name = "max8907 on_off",
+ .status_base = MAX8907_REG_ON_OFF_IRQ1,
+ .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
+ .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
+ .num_regs = 2,
+ .irqs = max8907_on_off_irqs,
+ .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
+};
+
+static const struct regmap_irq max8907_rtc_irqs[] = {
+ { .reg_offset = 0, .mask = 1 << 2, },
+ { .reg_offset = 0, .mask = 1 << 3, },
+};
+
+static const struct regmap_irq_chip max8907_rtc_irq_chip = {
+ .name = "max8907 rtc",
+ .status_base = MAX8907_REG_RTC_IRQ,
+ .mask_base = MAX8907_REG_RTC_IRQ_MASK,
+ .num_regs = 1,
+ .irqs = max8907_rtc_irqs,
+ .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
+};
+
+static __devinit int max8907_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct max8907 *max8907;
+ int ret;
+
+ max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
+ if (!max8907) {
+ ret = -ENOMEM;
+ goto err_alloc_drvdata;
+ }
+
+ max8907->dev = &i2c->dev;
+ dev_set_drvdata(max8907->dev, max8907);
+
+ max8907->i2c_gen = i2c;
+ i2c_set_clientdata(i2c, max8907);
+ max8907->regmap_gen = devm_regmap_init_i2c(i2c,
+ &max8907_regmap_gen_config);
+ if (IS_ERR(max8907->regmap_gen)) {
+ ret = PTR_ERR(max8907->regmap_gen);
+ dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
+ goto err_regmap_gen;
+ }
+
+ max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
+ if (!max8907->i2c_rtc) {
+ ret = -ENOMEM;
+ goto err_dummy_rtc;
+ }
+ i2c_set_clientdata(max8907->i2c_rtc, max8907);
+ max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
+ &max8907_regmap_rtc_config);
+ if (IS_ERR(max8907->regmap_rtc)) {
+ ret = PTR_ERR(max8907->regmap_rtc);
+ dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
+ goto err_regmap_rtc;
+ }
+
+ irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
+
+ ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
+ IRQF_ONESHOT | IRQF_SHARED, -1,
+ &max8907_chg_irq_chip,
+ &max8907->irqc_chg);
+ if (ret != 0) {
+ dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
+ goto err_irqc_chg;
+ }
+ ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
+ IRQF_ONESHOT | IRQF_SHARED, -1,
+ &max8907_on_off_irq_chip,
+ &max8907->irqc_on_off);
+ if (ret != 0) {
+ dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
+ goto err_irqc_on_off;
+ }
+ ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
+ IRQF_ONESHOT | IRQF_SHARED, -1,
+ &max8907_rtc_irq_chip,
+ &max8907->irqc_rtc);
+ if (ret != 0) {
+ dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
+ goto err_irqc_rtc;
+ }
+
+ enable_irq(max8907->i2c_gen->irq);
+
+ ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
+ ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
+ if (ret != 0) {
+ dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
+ goto err_add_devices;
+ }
+
+ return 0;
+
+err_add_devices:
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
+err_irqc_rtc:
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
+err_irqc_on_off:
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
+err_irqc_chg:
+err_regmap_rtc:
+ i2c_unregister_device(max8907->i2c_rtc);
+err_dummy_rtc:
+err_regmap_gen:
+err_alloc_drvdata:
+ return ret;
+}
+
+static __devexit int max8907_i2c_remove(struct i2c_client *i2c)
+{
+ struct max8907 *max8907 = i2c_get_clientdata(i2c);
+
+ mfd_remove_devices(max8907->dev);
+
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
+ regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
+
+ i2c_unregister_device(max8907->i2c_rtc);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id max8907_of_match[] = {
+ { .compatible = "maxim,max8907" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, max8907_of_match);
+#endif
+
+static const struct i2c_device_id max8907_i2c_id[] = {
+ {"max8907", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
+
+static struct i2c_driver max8907_i2c_driver = {
+ .driver = {
+ .name = "max8907",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(max8907_of_match),
+ },
+ .probe = max8907_i2c_probe,
+ .remove = max8907_i2c_remove,
+ .id_table = max8907_i2c_id,
+};
+
+static int __init max8907_i2c_init(void)
+{
+ int ret = -ENODEV;
+
+ ret = i2c_add_driver(&max8907_i2c_driver);
+ if (ret != 0)
+ pr_err("Failed to register I2C driver: %d\n", ret);
+
+ return ret;
+}
+subsys_initcall(max8907_i2c_init);
+
+static void __exit max8907_i2c_exit(void)
+{
+ i2c_del_driver(&max8907_i2c_driver);
+}
+module_exit(max8907_i2c_exit);
+
+MODULE_DESCRIPTION("MAX8907 multi-function core driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
+MODULE_LICENSE("GPL v2");
