mfd: Add ADP5520/ADP5501 driver

Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs

Subdevs:
LCD Backlight   : drivers/video/backlight/adp5520_bl.c
LEDs            : drivers/led/leds-adp5520.c
GPIO            : drivers/gpio/adp5520-gpio.c (ADP5520 only)
Keys            : drivers/input/keyboard/adp5520-keys.c (ADP5520 only)

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 378 insertions, 0 deletions

diff --git a/drivers/mfd/adp5520.c b/drivers/mfd/adp5520.c
new file mode 100644
index 000000000000..401a9b6029e3
--- /dev/null
+++ b/drivers/mfd/adp5520.c
@@ -0,0 +1,378 @@
+/*
+ * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
+ * LCD Backlight: drivers/video/backlight/adp5520_bl
+ * LEDs         : drivers/led/leds-adp5520
+ * GPIO         : drivers/gpio/adp5520-gpio (ADP5520 only)
+ * Keys         : drivers/input/keyboard/adp5520-keys (ADP5520 only)
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Derived from da903x:
+ * Copyright (C) 2008 Compulab, Ltd.
+ *      Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *      Eric Miao <eric.miao@marvell.com>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+
+#include <linux/mfd/adp5520.h>
+
+struct adp5520_chip {
+        struct i2c_client *client;
+        struct device *dev;
+        struct mutex lock;
+        struct blocking_notifier_head notifier_list;
+        int irq;
+        unsigned long id;
+};
+
+static int __adp5520_read(struct i2c_client *client,
+                                int reg, uint8_t *val)
+{
+        int ret;
+
+        ret = i2c_smbus_read_byte_data(client, reg);
+        if (ret < 0) {
+                dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
+                return ret;
+        }
+
+        *val = (uint8_t)ret;
+        return 0;
+}
+
+static int __adp5520_write(struct i2c_client *client,
+                                 int reg, uint8_t val)
+{
+        int ret;
+
+        ret = i2c_smbus_write_byte_data(client, reg, val);
+        if (ret < 0) {
+                dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
+                                val, reg);
+                return ret;
+        }
+        return 0;
+}
+
+int __adp5520_ack_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
+{
+        struct adp5520_chip *chip = i2c_get_clientdata(client);
+        uint8_t reg_val;
+        int ret;
+
+        mutex_lock(&chip->lock);
+
+        ret = __adp5520_read(client, reg, &reg_val);
+
+        if (!ret) {
+                reg_val |= bit_mask;
+                ret = __adp5520_write(client, reg, reg_val);
+        }
+
+        mutex_unlock(&chip->lock);
+        return ret;
+}
+
+int adp5520_write(struct device *dev, int reg, uint8_t val)
+{
+        return __adp5520_write(to_i2c_client(dev), reg, val);
+}
+EXPORT_SYMBOL_GPL(adp5520_write);
+
+int adp5520_read(struct device *dev, int reg, uint8_t *val)
+{
+        return __adp5520_read(to_i2c_client(dev), reg, val);
+}
+EXPORT_SYMBOL_GPL(adp5520_read);
+
+int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(dev);
+        uint8_t reg_val;
+        int ret;
+
+        mutex_lock(&chip->lock);
+
+        ret = __adp5520_read(chip->client, reg, &reg_val);
+
+        if (!ret && ((reg_val & bit_mask) == 0)) {
+                reg_val |= bit_mask;
+                ret = __adp5520_write(chip->client, reg, reg_val);
+        }
+
+        mutex_unlock(&chip->lock);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(adp5520_set_bits);
+
+int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(dev);
+        uint8_t reg_val;
+        int ret;
+
+        mutex_lock(&chip->lock);
+
+        ret = __adp5520_read(chip->client, reg, &reg_val);
+
+        if (!ret && (reg_val & bit_mask)) {
+                reg_val &= ~bit_mask;
+                ret = __adp5520_write(chip->client, reg, reg_val);
+        }
+
+        mutex_unlock(&chip->lock);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(adp5520_clr_bits);
+
+int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
+                                unsigned int events)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(dev);
+
+        if (chip->irq) {
+                adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
+                        events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
+                        ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
+
+                return blocking_notifier_chain_register(&chip->notifier_list,
+                         nb);
+        }
+
+        return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(adp5520_register_notifier);
+
+int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
+                                unsigned int events)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(dev);
+
+        adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
+                events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
+                ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
+
+        return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
+
+static irqreturn_t adp5520_irq_thread(int irq, void *data)
+{
+        struct adp5520_chip *chip = data;
+        unsigned int events;
+        uint8_t reg_val;
+        int ret;
+
+        ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
+        if (ret)
+                goto out;
+
+        events =  reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
+                ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
+
+        blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
+        /* ACK, Sticky bits are W1C */
+        __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
+
+out:
+        return IRQ_HANDLED;
+}
+
+static int __remove_subdev(struct device *dev, void *unused)
+{
+        platform_device_unregister(to_platform_device(dev));
+        return 0;
+}
+
+static int adp5520_remove_subdevs(struct adp5520_chip *chip)
+{
+        return device_for_each_child(chip->dev, NULL, __remove_subdev);
+}
+
+static int __devinit adp5520_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        struct adp5520_platform_data *pdata = client->dev.platform_data;
+        struct platform_device *pdev;
+        struct adp5520_chip *chip;
+        int ret;
+
+        if (!i2c_check_functionality(client->adapter,
+                                        I2C_FUNC_SMBUS_BYTE_DATA)) {
+                dev_err(&client->dev, "SMBUS Word Data not Supported\n");
+                return -EIO;
+        }
+
+        if (pdata == NULL) {
+                dev_err(&client->dev, "missing platform data\n");
+                return -ENODEV;
+        }
+
+        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+        if (!chip)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, chip);
+        chip->client = client;
+
+        chip->dev = &client->dev;
+        chip->irq = client->irq;
+        chip->id = id->driver_data;
+        mutex_init(&chip->lock);
+
+        if (chip->irq) {
+                BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
+
+                ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
+                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                "adp5520", chip);
+                if (ret) {
+                        dev_err(&client->dev, "failed to request irq %d\n",
+                                        chip->irq);
+                        goto out_free_chip;
+                }
+        }
+
+        ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
+        if (ret) {
+                dev_err(&client->dev, "failed to write\n");
+                goto out_free_irq;
+        }
+
+        if (pdata->keys) {
+                pdev = platform_device_register_data(chip->dev, "adp5520-keys",
+                                chip->id, pdata->keys, sizeof(*pdata->keys));
+                if (IS_ERR(pdev)) {
+                        ret = PTR_ERR(pdev);
+                        goto out_remove_subdevs;
+                }
+        }
+
+        if (pdata->gpio) {
+                pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
+                                chip->id, pdata->gpio, sizeof(*pdata->gpio));
+                if (IS_ERR(pdev)) {
+                        ret = PTR_ERR(pdev);
+                        goto out_remove_subdevs;
+                }
+        }
+
+        if (pdata->leds) {
+                pdev = platform_device_register_data(chip->dev, "adp5520-led",
+                                chip->id, pdata->leds, sizeof(*pdata->leds));
+                if (IS_ERR(pdev)) {
+                        ret = PTR_ERR(pdev);
+                        goto out_remove_subdevs;
+                }
+        }
+
+        if (pdata->backlight) {
+                pdev = platform_device_register_data(chip->dev,
+                                                "adp5520-backlight",
+                                                chip->id,
+                                                pdata->backlight,
+                                                sizeof(*pdata->backlight));
+                if (IS_ERR(pdev)) {
+                        ret = PTR_ERR(pdev);
+                        goto out_remove_subdevs;
+                }
+        }
+
+        return 0;
+
+out_remove_subdevs:
+        adp5520_remove_subdevs(chip);
+
+out_free_irq:
+        if (chip->irq)
+                free_irq(chip->irq, chip);
+
+out_free_chip:
+        i2c_set_clientdata(client, NULL);
+        kfree(chip);
+
+        return ret;
+}
+
+static int __devexit adp5520_remove(struct i2c_client *client)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
+
+        if (chip->irq)
+                free_irq(chip->irq, chip);
+
+        adp5520_remove_subdevs(chip);
+        adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
+        i2c_set_clientdata(client, NULL);
+        kfree(chip);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int adp5520_suspend(struct i2c_client *client,
+                                 pm_message_t state)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
+
+        adp5520_clr_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
+        return 0;
+}
+
+static int adp5520_resume(struct i2c_client *client)
+{
+        struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
+
+        adp5520_set_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
+        return 0;
+}
+#else
+#define adp5520_suspend NULL
+#define adp5520_resume  NULL
+#endif
+
+static const struct i2c_device_id adp5520_id[] = {
+        { "pmic-adp5520", ID_ADP5520 },
+        { "pmic-adp5501", ID_ADP5501 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, adp5520_id);
+
+static struct i2c_driver adp5520_driver = {
+        .driver = {
+                .name   = "adp5520",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = adp5520_probe,
+        .remove         = __devexit_p(adp5520_remove),
+        .suspend        = adp5520_suspend,
+        .resume         = adp5520_resume,
+        .id_table       = adp5520_id,
+};
+
+static int __init adp5520_init(void)
+{
+        return i2c_add_driver(&adp5520_driver);
+}
+module_init(adp5520_init);
+
+static void __exit adp5520_exit(void)
+{
+        i2c_del_driver(&adp5520_driver);
+}
+module_exit(adp5520_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
+MODULE_LICENSE("GPL");