mfd: Add support for DA9150 combined charger & fuel-gauge device

DA9150 is a combined Charger and Fuel-Gauge IC, with additional
GPIO and GPADC functionality.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 426 insertions, 1 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9cd2af660cc5..c47b2da7986e 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -195,6 +195,18 @@ config MFD_DA9063
           Additional drivers must be enabled in order to use the functionality
           of the device.
 
+config MFD_DA9150
+        tristate "Dialog Semiconductor DA9150 Charger Fuel-Gauge chip"
+        depends on I2C=y
+        select MFD_CORE
+        select REGMAP_I2C
+        select REGMAP_IRQ
+        help
+          This adds support for the DA9150 integrated charger and fuel-gauge
+          chip. This driver provides common support for accessing the device.
+          Additional drivers must be enabled in order to use the specific
+          features of the device.
+
 config MFD_DLN2
         tristate "Diolan DLN2 support"
         select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 4059c247c59a..02c2f2c69b94 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -113,7 +113,7 @@ obj-$(CONFIG_MFD_DA9055)	+= da9055.o
 
 da9063-objs                     := da9063-core.o da9063-irq.o da9063-i2c.o
 obj-$(CONFIG_MFD_DA9063)        += da9063.o
-
+obj-$(CONFIG_MFD_DA9150)        += da9150-core.o
 obj-$(CONFIG_MFD_MAX14577)      += max14577.o
 obj-$(CONFIG_MFD_MAX77686)      += max77686.o
 obj-$(CONFIG_MFD_MAX77693)      += max77693.o
diff --git a/drivers/mfd/da9150-core.c b/drivers/mfd/da9150-core.c
new file mode 100644
index 000000000000..4d757b97ef9a
--- /dev/null
+++ b/drivers/mfd/da9150-core.c
@@ -0,0 +1,413 @@
+/*
+ * DA9150 Core MFD Driver
+ *
+ * Copyright (c) 2014 Dialog Semiconductor
+ *
+ * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/da9150/core.h>
+#include <linux/mfd/da9150/registers.h>
+
+static bool da9150_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case DA9150_PAGE_CON:
+        case DA9150_STATUS_A:
+        case DA9150_STATUS_B:
+        case DA9150_STATUS_C:
+        case DA9150_STATUS_D:
+        case DA9150_STATUS_E:
+        case DA9150_STATUS_F:
+        case DA9150_STATUS_G:
+        case DA9150_STATUS_H:
+        case DA9150_STATUS_I:
+        case DA9150_STATUS_J:
+        case DA9150_STATUS_K:
+        case DA9150_STATUS_L:
+        case DA9150_STATUS_N:
+        case DA9150_FAULT_LOG_A:
+        case DA9150_FAULT_LOG_B:
+        case DA9150_EVENT_E:
+        case DA9150_EVENT_F:
+        case DA9150_EVENT_G:
+        case DA9150_EVENT_H:
+        case DA9150_CONTROL_B:
+        case DA9150_CONTROL_C:
+        case DA9150_GPADC_MAN:
+        case DA9150_GPADC_RES_A:
+        case DA9150_GPADC_RES_B:
+        case DA9150_ADETVB_CFG_C:
+        case DA9150_ADETD_STAT:
+        case DA9150_ADET_CMPSTAT:
+        case DA9150_ADET_CTRL_A:
+        case DA9150_PPR_TCTR_B:
+        case DA9150_COREBTLD_STAT_A:
+        case DA9150_CORE_DATA_A:
+        case DA9150_CORE_DATA_B:
+        case DA9150_CORE_DATA_C:
+        case DA9150_CORE_DATA_D:
+        case DA9150_CORE2WIRE_STAT_A:
+        case DA9150_FW_CTRL_C:
+        case DA9150_FG_CTRL_B:
+        case DA9150_FW_CTRL_B:
+        case DA9150_GPADC_CMAN:
+        case DA9150_GPADC_CRES_A:
+        case DA9150_GPADC_CRES_B:
+        case DA9150_CC_ICHG_RES_A:
+        case DA9150_CC_ICHG_RES_B:
+        case DA9150_CC_IAVG_RES_A:
+        case DA9150_CC_IAVG_RES_B:
+        case DA9150_TAUX_CTRL_A:
+        case DA9150_TAUX_VALUE_H:
+        case DA9150_TAUX_VALUE_L:
+        case DA9150_TBAT_RES_A:
+        case DA9150_TBAT_RES_B:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static const struct regmap_range_cfg da9150_range_cfg[] = {
+        {
+                .range_min = DA9150_PAGE_CON,
+                .range_max = DA9150_TBAT_RES_B,
+                .selector_reg = DA9150_PAGE_CON,
+                .selector_mask = DA9150_I2C_PAGE_MASK,
+                .selector_shift = DA9150_I2C_PAGE_SHIFT,
+                .window_start = 0,
+                .window_len = 256,
+        },
+};
+
+static struct regmap_config da9150_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .ranges = da9150_range_cfg,
+        .num_ranges = ARRAY_SIZE(da9150_range_cfg),
+        .max_register = DA9150_TBAT_RES_B,
+
+        .cache_type = REGCACHE_RBTREE,
+
+        .volatile_reg = da9150_volatile_reg,
+};
+
+u8 da9150_reg_read(struct da9150 *da9150, u16 reg)
+{
+        int val, ret;
+
+        ret = regmap_read(da9150->regmap, reg, &val);
+        if (ret)
+                dev_err(da9150->dev, "Failed to read from reg 0x%x: %d\n",
+                        reg, ret);
+
+        return (u8) val;
+}
+EXPORT_SYMBOL_GPL(da9150_reg_read);
+
+void da9150_reg_write(struct da9150 *da9150, u16 reg, u8 val)
+{
+        int ret;
+
+        ret = regmap_write(da9150->regmap, reg, val);
+        if (ret)
+                dev_err(da9150->dev, "Failed to write to reg 0x%x: %d\n",
+                        reg, ret);
+}
+EXPORT_SYMBOL_GPL(da9150_reg_write);
+
+void da9150_set_bits(struct da9150 *da9150, u16 reg, u8 mask, u8 val)
+{
+        int ret;
+
+        ret = regmap_update_bits(da9150->regmap, reg, mask, val);
+        if (ret)
+                dev_err(da9150->dev, "Failed to set bits in reg 0x%x: %d\n",
+                        reg, ret);
+}
+EXPORT_SYMBOL_GPL(da9150_set_bits);
+
+void da9150_bulk_read(struct da9150 *da9150, u16 reg, int count, u8 *buf)
+{
+        int ret;
+
+        ret = regmap_bulk_read(da9150->regmap, reg, buf, count);
+        if (ret)
+                dev_err(da9150->dev, "Failed to bulk read from reg 0x%x: %d\n",
+                        reg, ret);
+}
+EXPORT_SYMBOL_GPL(da9150_bulk_read);
+
+void da9150_bulk_write(struct da9150 *da9150, u16 reg, int count, const u8 *buf)
+{
+        int ret;
+
+        ret = regmap_raw_write(da9150->regmap, reg, buf, count);
+        if (ret)
+                dev_err(da9150->dev, "Failed to bulk write to reg 0x%x %d\n",
+                        reg, ret);
+}
+EXPORT_SYMBOL_GPL(da9150_bulk_write);
+
+static struct regmap_irq da9150_irqs[] = {
+        [DA9150_IRQ_VBUS] = {
+                .reg_offset = 0,
+                .mask = DA9150_E_VBUS_MASK,
+        },
+        [DA9150_IRQ_CHG] = {
+                .reg_offset = 0,
+                .mask = DA9150_E_CHG_MASK,
+        },
+        [DA9150_IRQ_TCLASS] = {
+                .reg_offset = 0,
+                .mask = DA9150_E_TCLASS_MASK,
+        },
+        [DA9150_IRQ_TJUNC] = {
+                .reg_offset = 0,
+                .mask = DA9150_E_TJUNC_MASK,
+        },
+        [DA9150_IRQ_VFAULT] = {
+                .reg_offset = 0,
+                .mask = DA9150_E_VFAULT_MASK,
+        },
+        [DA9150_IRQ_CONF] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_CONF_MASK,
+        },
+        [DA9150_IRQ_DAT] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_DAT_MASK,
+        },
+        [DA9150_IRQ_DTYPE] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_DTYPE_MASK,
+        },
+        [DA9150_IRQ_ID] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_ID_MASK,
+        },
+        [DA9150_IRQ_ADP] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_ADP_MASK,
+        },
+        [DA9150_IRQ_SESS_END] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_SESS_END_MASK,
+        },
+        [DA9150_IRQ_SESS_VLD] = {
+                .reg_offset = 1,
+                .mask = DA9150_E_SESS_VLD_MASK,
+        },
+        [DA9150_IRQ_FG] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_FG_MASK,
+        },
+        [DA9150_IRQ_GP] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GP_MASK,
+        },
+        [DA9150_IRQ_TBAT] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_TBAT_MASK,
+        },
+        [DA9150_IRQ_GPIOA] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GPIOA_MASK,
+        },
+        [DA9150_IRQ_GPIOB] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GPIOB_MASK,
+        },
+        [DA9150_IRQ_GPIOC] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GPIOC_MASK,
+        },
+        [DA9150_IRQ_GPIOD] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GPIOD_MASK,
+        },
+        [DA9150_IRQ_GPADC] = {
+                .reg_offset = 2,
+                .mask = DA9150_E_GPADC_MASK,
+        },
+        [DA9150_IRQ_WKUP] = {
+                .reg_offset = 3,
+                .mask = DA9150_E_WKUP_MASK,
+        },
+};
+
+static struct regmap_irq_chip da9150_regmap_irq_chip = {
+        .name = "da9150_irq",
+        .status_base = DA9150_EVENT_E,
+        .mask_base = DA9150_IRQ_MASK_E,
+        .ack_base = DA9150_EVENT_E,
+        .num_regs = DA9150_NUM_IRQ_REGS,
+        .irqs = da9150_irqs,
+        .num_irqs = ARRAY_SIZE(da9150_irqs),
+};
+
+static struct resource da9150_gpadc_resources[] = {
+        {
+                .name = "GPADC",
+                .start = DA9150_IRQ_GPADC,
+                .end = DA9150_IRQ_GPADC,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct resource da9150_charger_resources[] = {
+        {
+                .name = "CHG_STATUS",
+                .start = DA9150_IRQ_CHG,
+                .end = DA9150_IRQ_CHG,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "CHG_TJUNC",
+                .start = DA9150_IRQ_TJUNC,
+                .end = DA9150_IRQ_TJUNC,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "CHG_VFAULT",
+                .start = DA9150_IRQ_VFAULT,
+                .end = DA9150_IRQ_VFAULT,
+                .flags = IORESOURCE_IRQ,
+        },
+        {
+                .name = "CHG_VBUS",
+                .start = DA9150_IRQ_VBUS,
+                .end = DA9150_IRQ_VBUS,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct mfd_cell da9150_devs[] = {
+        {
+                .name = "da9150-gpadc",
+                .of_compatible = "dlg,da9150-gpadc",
+                .resources = da9150_gpadc_resources,
+                .num_resources = ARRAY_SIZE(da9150_gpadc_resources),
+        },
+        {
+                .name = "da9150-charger",
+                .of_compatible = "dlg,da9150-charger",
+                .resources = da9150_charger_resources,
+                .num_resources = ARRAY_SIZE(da9150_charger_resources),
+        },
+};
+
+static int da9150_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct da9150 *da9150;
+        struct da9150_pdata *pdata = dev_get_platdata(&client->dev);
+        int ret;
+
+        da9150 = devm_kzalloc(&client->dev, sizeof(*da9150), GFP_KERNEL);
+        if (!da9150)
+                return -ENOMEM;
+
+        da9150->dev = &client->dev;
+        da9150->irq = client->irq;
+        i2c_set_clientdata(client, da9150);
+
+        da9150->regmap = devm_regmap_init_i2c(client, &da9150_regmap_config);
+        if (IS_ERR(da9150->regmap)) {
+                ret = PTR_ERR(da9150->regmap);
+                dev_err(da9150->dev, "Failed to allocate register map: %d\n",
+                        ret);
+                return ret;
+        }
+
+        da9150->irq_base = pdata ? pdata->irq_base : -1;
+
+        ret = regmap_add_irq_chip(da9150->regmap, da9150->irq,
+                                  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                  da9150->irq_base, &da9150_regmap_irq_chip,
+                                  &da9150->regmap_irq_data);
+        if (ret)
+                return ret;
+
+        da9150->irq_base = regmap_irq_chip_get_base(da9150->regmap_irq_data);
+        enable_irq_wake(da9150->irq);
+
+        ret = mfd_add_devices(da9150->dev, -1, da9150_devs,
+                              ARRAY_SIZE(da9150_devs), NULL,
+                              da9150->irq_base, NULL);
+        if (ret) {
+                dev_err(da9150->dev, "Failed to add child devices: %d\n", ret);
+                regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int da9150_remove(struct i2c_client *client)
+{
+        struct da9150 *da9150 = i2c_get_clientdata(client);
+
+        regmap_del_irq_chip(da9150->irq, da9150->regmap_irq_data);
+        mfd_remove_devices(da9150->dev);
+
+        return 0;
+}
+
+static void da9150_shutdown(struct i2c_client *client)
+{
+        struct da9150 *da9150 = i2c_get_clientdata(client);
+
+        /* Make sure we have a wakup source for the device */
+        da9150_set_bits(da9150, DA9150_CONFIG_D,
+                        DA9150_WKUP_PM_EN_MASK,
+                        DA9150_WKUP_PM_EN_MASK);
+
+        /* Set device to DISABLED mode */
+        da9150_set_bits(da9150, DA9150_CONTROL_C,
+                        DA9150_DISABLE_MASK, DA9150_DISABLE_MASK);
+}
+
+static const struct i2c_device_id da9150_i2c_id[] = {
+        { "da9150", },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, da9150_i2c_id);
+
+static const struct of_device_id da9150_of_match[] = {
+        { .compatible = "dlg,da9150", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, da9150_of_match);
+
+static struct i2c_driver da9150_driver = {
+        .driver = {
+                .name   = "da9150",
+                .of_match_table = of_match_ptr(da9150_of_match),
+        },
+        .probe          = da9150_probe,
+        .remove         = da9150_remove,
+        .shutdown       = da9150_shutdown,
+        .id_table       = da9150_i2c_id,
+};
+
+module_i2c_driver(da9150_driver);
+
+MODULE_DESCRIPTION("MFD Core Driver for DA9150");
+MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
+MODULE_LICENSE("GPL");