mfd: Add support for ams AS3722 PMIC

The ams AS3722 is a compact system PMU suitable for mobile phones,
tablets etc. It has 4 DC/DC step-down regulators, 3 DC/DC step-down
controller, 11 LDOs, RTC, automatic battery, temperature and
over-current monitoring, 8 GPIOs, ADC and a watchdog.

Add MFD core driver for the AS3722 to support core functionality.

Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Florian Lobmaier <florian.lobmaier@ams.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 462 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d078fe4a82ef..b7c74a73d371 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -27,6 +27,18 @@ config MFD_AS3711
         help
           Support for the AS3711 PMIC from AMS
 
+config MFD_AS3722
+        bool "ams AS3722 Power Management IC"
+        select MFD_CORE
+        select REGMAP_I2C
+        select REGMAP_IRQ
+        depends on I2C && OF
+        help
+          The ams AS3722 is a compact system PMU suitable for mobile phones,
+          tablets etc. It has 4 DC/DC step-down regulators, 3 DC/DC step-down
+          controllers, 11 LDOs, RTC, automatic battery, temperature and
+          over current monitoring, GPIOs, ADC and a watchdog.
+
 config PMIC_ADP5520
         bool "Analog Devices ADP5520/01 MFD PMIC Core Support"
         depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 656cec90a1e5..8a28dc90fe78 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -162,4 +162,5 @@ obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o
 obj-$(CONFIG_VEXPRESS_CONFIG)   += vexpress-config.o vexpress-sysreg.o
 obj-$(CONFIG_MFD_RETU)          += retu-mfd.o
 obj-$(CONFIG_MFD_AS3711)        += as3711.o
+obj-$(CONFIG_MFD_AS3722)        += as3722.o
 obj-$(CONFIG_MFD_STW481X)       += stw481x.o
diff --git a/drivers/mfd/as3722.c b/drivers/mfd/as3722.c
new file mode 100644
index 000000000000..cd8ee593cfa8
--- /dev/null
+++ b/drivers/mfd/as3722.c
@@ -0,0 +1,449 @@
+/*
+ * Core driver for ams AS3722 PMICs
+ *
+ * Copyright (C) 2013 AMS AG
+ * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
+ *
+ * Author: Florian Lobmaier <florian.lobmaier@ams.com>
+ * Author: Laxman Dewangan <ldewangan@nvidia.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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/as3722.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define AS3722_DEVICE_ID        0x0C
+
+static const struct resource as3722_rtc_resource[] = {
+        {
+                .name = "as3722-rtc-alarm",
+                .start = AS3722_IRQ_RTC_ALARM,
+                .end = AS3722_IRQ_RTC_ALARM,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static const struct resource as3722_adc_resource[] = {
+        {
+                .name = "as3722-adc",
+                .start = AS3722_IRQ_ADC,
+                .end = AS3722_IRQ_ADC,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct mfd_cell as3722_devs[] = {
+        {
+                .name = "as3722-pinctrl",
+        },
+        {
+                .name = "as3722-regulator",
+        },
+        {
+                .name = "as3722-rtc",
+                .num_resources = ARRAY_SIZE(as3722_rtc_resource),
+                .resources = as3722_rtc_resource,
+        },
+        {
+                .name = "as3722-adc",
+                .num_resources = ARRAY_SIZE(as3722_adc_resource),
+                .resources = as3722_adc_resource,
+        },
+        {
+                .name = "as3722-power-off",
+        },
+};
+
+static const struct regmap_irq as3722_irqs[] = {
+        /* INT1 IRQs */
+        [AS3722_IRQ_LID] = {
+                .mask = AS3722_INTERRUPT_MASK1_LID,
+        },
+        [AS3722_IRQ_ACOK] = {
+                .mask = AS3722_INTERRUPT_MASK1_ACOK,
+        },
+        [AS3722_IRQ_ENABLE1] = {
+                .mask = AS3722_INTERRUPT_MASK1_ENABLE1,
+        },
+        [AS3722_IRQ_OCCUR_ALARM_SD0] = {
+                .mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
+        },
+        [AS3722_IRQ_ONKEY_LONG_PRESS] = {
+                .mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
+        },
+        [AS3722_IRQ_ONKEY] = {
+                .mask = AS3722_INTERRUPT_MASK1_ONKEY,
+        },
+        [AS3722_IRQ_OVTMP] = {
+                .mask = AS3722_INTERRUPT_MASK1_OVTMP,
+        },
+        [AS3722_IRQ_LOWBAT] = {
+                .mask = AS3722_INTERRUPT_MASK1_LOWBAT,
+        },
+
+        /* INT2 IRQs */
+        [AS3722_IRQ_SD0_LV] = {
+                .mask = AS3722_INTERRUPT_MASK2_SD0_LV,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_SD1_LV] = {
+                .mask = AS3722_INTERRUPT_MASK2_SD1_LV,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_SD2_LV] = {
+                .mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_PWM1_OV_PROT] = {
+                .mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_PWM2_OV_PROT] = {
+                .mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_ENABLE2] = {
+                .mask = AS3722_INTERRUPT_MASK2_ENABLE2,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_SD6_LV] = {
+                .mask = AS3722_INTERRUPT_MASK2_SD6_LV,
+                .reg_offset = 1,
+        },
+        [AS3722_IRQ_RTC_REP] = {
+                .mask = AS3722_INTERRUPT_MASK2_RTC_REP,
+                .reg_offset = 1,
+        },
+
+        /* INT3 IRQs */
+        [AS3722_IRQ_RTC_ALARM] = {
+                .mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_GPIO1] = {
+                .mask = AS3722_INTERRUPT_MASK3_GPIO1,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_GPIO2] = {
+                .mask = AS3722_INTERRUPT_MASK3_GPIO2,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_GPIO3] = {
+                .mask = AS3722_INTERRUPT_MASK3_GPIO3,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_GPIO4] = {
+                .mask = AS3722_INTERRUPT_MASK3_GPIO4,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_GPIO5] = {
+                .mask = AS3722_INTERRUPT_MASK3_GPIO5,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_WATCHDOG] = {
+                .mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
+                .reg_offset = 2,
+        },
+        [AS3722_IRQ_ENABLE3] = {
+                .mask = AS3722_INTERRUPT_MASK3_ENABLE3,
+                .reg_offset = 2,
+        },
+
+        /* INT4 IRQs */
+        [AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_TEMP_SD0_ALARM] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_TEMP_SD1_ALARM] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_TEMP_SD6_ALARM] = {
+                .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_OCCUR_ALARM_SD6] = {
+                .mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
+                .reg_offset = 3,
+        },
+        [AS3722_IRQ_ADC] = {
+                .mask = AS3722_INTERRUPT_MASK4_ADC,
+                .reg_offset = 3,
+        },
+};
+
+static const struct regmap_irq_chip as3722_irq_chip = {
+        .name = "as3722",
+        .irqs = as3722_irqs,
+        .num_irqs = ARRAY_SIZE(as3722_irqs),
+        .num_regs = 4,
+        .status_base = AS3722_INTERRUPT_STATUS1_REG,
+        .mask_base = AS3722_INTERRUPT_MASK1_REG,
+};
+
+static int as3722_check_device_id(struct as3722 *as3722)
+{
+        u32 val;
+        int ret;
+
+        /* Check that this is actually a AS3722 */
+        ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
+        if (ret < 0) {
+                dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
+                return ret;
+        }
+
+        if (val != AS3722_DEVICE_ID) {
+                dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
+                return -ENODEV;
+        }
+
+        ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
+        if (ret < 0) {
+                dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
+                return ret;
+        }
+
+        dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
+        return 0;
+}
+
+static int as3722_configure_pullups(struct as3722 *as3722)
+{
+        int ret;
+        u32 val = 0;
+
+        if (as3722->en_intern_int_pullup)
+                val |= AS3722_INT_PULL_UP;
+        if (as3722->en_intern_i2c_pullup)
+                val |= AS3722_I2C_PULL_UP;
+
+        ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
+                        AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
+        if (ret < 0)
+                dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
+        return ret;
+}
+
+static const struct regmap_range as3722_readable_ranges[] = {
+        regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
+        regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
+        regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
+        regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
+        regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
+        regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
+                                        AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
+        regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
+        regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
+        regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
+        regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
+        regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
+        regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
+        regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
+};
+
+static const struct regmap_access_table as3722_readable_table = {
+        .yes_ranges = as3722_readable_ranges,
+        .n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
+};
+
+static const struct regmap_range as3722_writable_ranges[] = {
+        regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
+        regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
+        regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
+        regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
+        regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
+        regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
+        regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
+                                        AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
+        regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
+        regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
+        regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
+        regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
+        regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
+                                        AS3722_ADC_CONFIGURATION_REG),
+        regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
+};
+
+static const struct regmap_access_table as3722_writable_table = {
+        .yes_ranges = as3722_writable_ranges,
+        .n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
+};
+
+static const struct regmap_range as3722_cacheable_ranges[] = {
+        regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
+        regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
+};
+
+static const struct regmap_access_table as3722_volatile_table = {
+        .no_ranges = as3722_cacheable_ranges,
+        .n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
+};
+
+const struct regmap_config as3722_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .max_register = AS3722_MAX_REGISTER,
+        .cache_type = REGCACHE_RBTREE,
+        .rd_table = &as3722_readable_table,
+        .wr_table = &as3722_writable_table,
+        .volatile_table = &as3722_volatile_table,
+};
+
+static int as3722_i2c_of_probe(struct i2c_client *i2c,
+                        struct as3722 *as3722)
+{
+        struct device_node *np = i2c->dev.of_node;
+        struct irq_data *irq_data;
+
+        if (!np) {
+                dev_err(&i2c->dev, "Device Tree not found\n");
+                return -EINVAL;
+        }
+
+        irq_data = irq_get_irq_data(i2c->irq);
+        if (!irq_data) {
+                dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
+                return -EINVAL;
+        }
+
+        as3722->en_intern_int_pullup = of_property_read_bool(np,
+                                        "ams,enable-internal-int-pullup");
+        as3722->en_intern_i2c_pullup = of_property_read_bool(np,
+                                        "ams,enable-internal-i2c-pullup");
+        as3722->irq_flags = irqd_get_trigger_type(irq_data);
+        dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
+        return 0;
+}
+
+static int as3722_i2c_probe(struct i2c_client *i2c,
+                        const struct i2c_device_id *id)
+{
+        struct as3722 *as3722;
+        unsigned long irq_flags;
+        int ret;
+
+        as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
+        if (!as3722)
+                return -ENOMEM;
+
+        as3722->dev = &i2c->dev;
+        as3722->chip_irq = i2c->irq;
+        i2c_set_clientdata(i2c, as3722);
+
+        ret = as3722_i2c_of_probe(i2c, as3722);
+        if (ret < 0)
+                return ret;
+
+        as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
+        if (IS_ERR(as3722->regmap)) {
+                ret = PTR_ERR(as3722->regmap);
+                dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+                return ret;
+        }
+
+        ret = as3722_check_device_id(as3722);
+        if (ret < 0)
+                return ret;
+
+        irq_flags = as3722->irq_flags | IRQF_ONESHOT;
+        ret = regmap_add_irq_chip(as3722->regmap, as3722->chip_irq,
+                        irq_flags, -1, &as3722_irq_chip,
+                        &as3722->irq_data);
+        if (ret < 0) {
+                dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
+                return ret;
+        }
+
+        ret = as3722_configure_pullups(as3722);
+        if (ret < 0)
+                goto scrub;
+
+        ret = mfd_add_devices(&i2c->dev, -1, as3722_devs,
+                        ARRAY_SIZE(as3722_devs), NULL, 0,
+                        regmap_irq_get_domain(as3722->irq_data));
+        if (ret) {
+                dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
+                goto scrub;
+        }
+
+        dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
+        return 0;
+
+scrub:
+        regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
+        return ret;
+}
+
+static int as3722_i2c_remove(struct i2c_client *i2c)
+{
+        struct as3722 *as3722 = i2c_get_clientdata(i2c);
+
+        mfd_remove_devices(as3722->dev);
+        regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
+        return 0;
+}
+
+static const struct of_device_id as3722_of_match[] = {
+        { .compatible = "ams,as3722", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, as3722_of_match);
+
+static const struct i2c_device_id as3722_i2c_id[] = {
+        { "as3722", 0 },
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
+
+static struct i2c_driver as3722_i2c_driver = {
+        .driver = {
+                .name = "as3722",
+                .owner = THIS_MODULE,
+                .of_match_table = as3722_of_match,
+        },
+        .probe = as3722_i2c_probe,
+        .remove = as3722_i2c_remove,
+        .id_table = as3722_i2c_id,
+};
+
+module_i2c_driver(as3722_i2c_driver);
+
+MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
+MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL");