mfd: Initial max8925 support
Basic Max8925 support, which is a power management IC from Maxim
Semiconductor.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 815907e..ee416ee 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -194,6 +194,15 @@
individual components like LCD backlight, LEDs, GPIOs and Kepad
under the corresponding menus.
+config MFD_MAX8925
+ tristate "Maxim Semiconductor MAX8925 PMIC Support"
+ depends on I2C
+ help
+ Say yes here to support for Maxim Semiconductor MAX8925. This is
+ a Power Management IC. This driver provies common support for
+ accessing the device, additional drivers must be enabled in order
+ to use the functionality of the device.
+
config MFD_WM8400
tristate "Support Wolfson Microelectronics WM8400"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 1e3ae06..2616357 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -49,6 +49,8 @@
obj-$(CONFIG_UCB1400_CORE) += ucb1400_core.o
obj-$(CONFIG_PMIC_DA903X) += da903x.o
+max8925-objs := max8925-core.o max8925-i2c.o
+obj-$(CONFIG_MFD_MAX8925) += max8925.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
diff --git a/drivers/mfd/max8925-core.c b/drivers/mfd/max8925-core.c
new file mode 100644
index 0000000..3e26267
--- /dev/null
+++ b/drivers/mfd/max8925-core.c
@@ -0,0 +1,262 @@
+/*
+ * Base driver for Maxim MAX8925
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8925.h>
+
+#define IRQ_MODE_STATUS 0
+#define IRQ_MODE_MASK 1
+
+static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode,
+ int *offset, int *bit)
+{
+ if (!offset || !bit)
+ return -EINVAL;
+
+ switch (chip->chip_id) {
+ case MAX8925_GPM:
+ *bit = irq % BITS_PER_BYTE;
+ if (irq < (BITS_PER_BYTE << 1)) { /* irq = [0,15] */
+ *offset = (mode) ? MAX8925_CHG_IRQ1_MASK
+ : MAX8925_CHG_IRQ1;
+ if (irq >= BITS_PER_BYTE)
+ (*offset)++;
+ } else { /* irq = [16,31] */
+ *offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK
+ : MAX8925_ON_OFF_IRQ1;
+ if (irq >= (BITS_PER_BYTE * 3))
+ (*offset)++;
+ }
+ break;
+ case MAX8925_ADC:
+ *bit = irq % BITS_PER_BYTE;
+ *offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ;
+ break;
+ default:
+ goto out;
+ }
+ return 0;
+out:
+ dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq);
+ return -EINVAL;
+}
+
+static int __check_irq(int irq)
+{
+ if ((irq < 0) || (irq >= MAX8925_NUM_IRQ))
+ return -EINVAL;
+ return 0;
+}
+
+int max8925_mask_irq(struct max8925_chip *chip, int irq)
+{
+ int offset, bit, ret;
+
+ ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
+ if (ret < 0)
+ return ret;
+ ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit);
+ return ret;
+}
+
+int max8925_unmask_irq(struct max8925_chip *chip, int irq)
+{
+ int offset, bit, ret;
+
+ ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
+ if (ret < 0)
+ return ret;
+ ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0);
+ return ret;
+}
+
+#define INT_STATUS_NUM (MAX8925_NUM_IRQ / BITS_PER_BYTE)
+
+static irqreturn_t max8925_irq_thread(int irq, void *data)
+{
+ struct max8925_chip *chip = data;
+ unsigned long irq_status[INT_STATUS_NUM];
+ unsigned char status_buf[INT_STATUS_NUM << 1];
+ int i, ret;
+
+ memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM);
+
+ /* all these interrupt status registers are read-only */
+ switch (chip->chip_id) {
+ case MAX8925_GPM:
+ ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1,
+ 4, status_buf);
+ if (ret < 0)
+ goto out;
+ ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1,
+ 2, &status_buf[4]);
+ if (ret < 0)
+ goto out;
+ ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2,
+ 2, &status_buf[6]);
+ if (ret < 0)
+ goto out;
+ /* clear masked interrupt status */
+ status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK);
+ irq_status[0] |= status_buf[0];
+ status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK);
+ irq_status[0] |= (status_buf[1] << BITS_PER_BYTE);
+ status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK);
+ irq_status[0] |= (status_buf[4] << (BITS_PER_BYTE * 2));
+ status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK);
+ irq_status[0] |= (status_buf[6] << (BITS_PER_BYTE * 3));
+ break;
+ case MAX8925_ADC:
+ ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ,
+ 2, status_buf);
+ if (ret < 0)
+ goto out;
+ /* clear masked interrupt status */
+ status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK);
+ irq_status[0] |= status_buf[0];
+ break;
+ default:
+ goto out;
+ }
+
+ for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) {
+ clear_bit(i, irq_status);
+ dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name);
+
+ mutex_lock(&chip->irq_lock);
+ if (chip->irq[i].handler)
+ chip->irq[i].handler(i, chip->irq[i].data);
+ else {
+ max8925_mask_irq(chip, i);
+ dev_err(chip->dev, "Noboday cares IRQ #%d in %s. "
+ "Now mask it.\n", i, chip->name);
+ }
+ mutex_unlock(&chip->irq_lock);
+ }
+out:
+ return IRQ_HANDLED;
+}
+
+int max8925_request_irq(struct max8925_chip *chip, int irq,
+ irq_handler_t handler, void *data)
+{
+ if ((__check_irq(irq) < 0) || !handler)
+ return -EINVAL;
+
+ mutex_lock(&chip->irq_lock);
+ chip->irq[irq].handler = handler;
+ chip->irq[irq].data = data;
+ mutex_unlock(&chip->irq_lock);
+ return 0;
+}
+EXPORT_SYMBOL(max8925_request_irq);
+
+int max8925_free_irq(struct max8925_chip *chip, int irq)
+{
+ if (__check_irq(irq) < 0)
+ return -EINVAL;
+
+ mutex_lock(&chip->irq_lock);
+ chip->irq[irq].handler = NULL;
+ chip->irq[irq].data = NULL;
+ mutex_unlock(&chip->irq_lock);
+ return 0;
+}
+EXPORT_SYMBOL(max8925_free_irq);
+
+static int __devinit device_gpm_init(struct max8925_chip *chip,
+ struct i2c_client *i2c,
+ struct max8925_platform_data *pdata)
+{
+ int ret;
+
+ /* mask all IRQs */
+ ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7);
+ if (ret < 0)
+ goto out;
+ ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff);
+ if (ret < 0)
+ goto out;
+ ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff);
+ if (ret < 0)
+ goto out;
+ ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3);
+ if (ret < 0)
+ goto out;
+
+ chip->name = "GPM";
+ memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
+ ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
+ IRQF_ONESHOT | IRQF_TRIGGER_LOW,
+ "max8925-gpm", chip);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
+ goto out;
+ }
+ chip->chip_irq = i2c->irq;
+
+ /* enable hard-reset for ONKEY power-off */
+ max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80);
+out:
+ return ret;
+}
+
+static int __devinit device_adc_init(struct max8925_chip *chip,
+ struct i2c_client *i2c,
+ struct max8925_platform_data *pdata)
+{
+ int ret;
+
+ /* mask all IRQs */
+ ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3);
+
+ chip->name = "ADC";
+ memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
+ ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
+ IRQF_ONESHOT | IRQF_TRIGGER_LOW,
+ "max8925-adc", chip);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
+ goto out;
+ }
+ chip->chip_irq = i2c->irq;
+out:
+ return ret;
+}
+
+int __devinit max8925_device_init(struct max8925_chip *chip,
+ struct max8925_platform_data *pdata)
+{
+ switch (chip->chip_id) {
+ case MAX8925_GPM:
+ device_gpm_init(chip, chip->i2c, pdata);
+ break;
+ case MAX8925_ADC:
+ device_adc_init(chip, chip->i2c, pdata);
+ break;
+ }
+ return 0;
+}
+
+void max8925_device_exit(struct max8925_chip *chip)
+{
+ if (chip->chip_irq >= 0)
+ free_irq(chip->chip_irq, chip);
+}
+
+MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c
new file mode 100644
index 0000000..942068e
--- /dev/null
+++ b/drivers/mfd/max8925-i2c.c
@@ -0,0 +1,210 @@
+/*
+ * I2C driver for Maxim MAX8925
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/mfd/max8925.h>
+
+static inline int max8925_read_device(struct i2c_client *i2c,
+ int reg, int bytes, void *dest)
+{
+ unsigned char data;
+ unsigned char *buf;
+ int ret;
+
+ buf = kzalloc(bytes + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ data = (unsigned char)reg;
+ ret = i2c_master_send(i2c, &data, 1);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_master_recv(i2c, buf, bytes + 1);
+ if (ret < 0)
+ return ret;
+ memcpy(dest, buf, bytes);
+ return 0;
+}
+
+static inline int max8925_write_device(struct i2c_client *i2c,
+ int reg, int bytes, void *src)
+{
+ unsigned char buf[bytes + 1];
+ int ret;
+
+ buf[0] = (unsigned char)reg;
+ memcpy(&buf[1], src, bytes);
+
+ ret = i2c_master_send(i2c, buf, bytes + 1);
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
+int max8925_reg_read(struct i2c_client *i2c, int reg)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(i2c);
+ unsigned char data;
+ int ret;
+
+ mutex_lock(&chip->io_lock);
+ ret = max8925_read_device(i2c, reg, 1, &data);
+ mutex_unlock(&chip->io_lock);
+
+ if (ret < 0)
+ return ret;
+ else
+ return (int)data;
+}
+EXPORT_SYMBOL(max8925_reg_read);
+
+int max8925_reg_write(struct i2c_client *i2c, int reg,
+ unsigned char data)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&chip->io_lock);
+ ret = max8925_write_device(i2c, reg, 1, &data);
+ mutex_unlock(&chip->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(max8925_reg_write);
+
+int max8925_bulk_read(struct i2c_client *i2c, int reg,
+ int count, unsigned char *buf)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&chip->io_lock);
+ ret = max8925_read_device(i2c, reg, count, buf);
+ mutex_unlock(&chip->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(max8925_bulk_read);
+
+int max8925_bulk_write(struct i2c_client *i2c, int reg,
+ int count, unsigned char *buf)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(i2c);
+ int ret;
+
+ mutex_lock(&chip->io_lock);
+ ret = max8925_write_device(i2c, reg, count, buf);
+ mutex_unlock(&chip->io_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(max8925_bulk_write);
+
+int max8925_set_bits(struct i2c_client *i2c, int reg,
+ unsigned char mask, unsigned char data)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(i2c);
+ unsigned char value;
+ int ret;
+
+ mutex_lock(&chip->io_lock);
+ ret = max8925_read_device(i2c, reg, 1, &value);
+ if (ret < 0)
+ goto out;
+ value &= ~mask;
+ value |= data;
+ ret = max8925_write_device(i2c, reg, 1, &value);
+out:
+ mutex_unlock(&chip->io_lock);
+ return ret;
+}
+EXPORT_SYMBOL(max8925_set_bits);
+
+
+static const struct i2c_device_id max8925_id_table[] = {
+ { "max8925", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, max8925_id_table);
+
+static int __devinit max8925_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max8925_platform_data *pdata = client->dev.platform_data;
+ struct max8925_chip *chip;
+
+ if (!pdata) {
+ pr_info("%s: platform data is missing\n", __func__);
+ return -EINVAL;
+ }
+ if ((pdata->chip_id <= MAX8925_INVALID)
+ || (pdata->chip_id >= MAX8925_MAX)) {
+ pr_info("#%s: wrong chip identification\n", __func__);
+ return -EINVAL;
+ }
+
+ chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
+ if (chip == NULL)
+ return -ENOMEM;
+ chip->i2c = client;
+ chip->chip_id = pdata->chip_id;
+ i2c_set_clientdata(client, chip);
+ chip->dev = &client->dev;
+ mutex_init(&chip->io_lock);
+ dev_set_drvdata(chip->dev, chip);
+ max8925_device_init(chip, pdata);
+
+ return 0;
+}
+
+static int __devexit max8925_remove(struct i2c_client *client)
+{
+ struct max8925_chip *chip = i2c_get_clientdata(client);
+
+ max8925_device_exit(chip);
+ i2c_set_clientdata(client, NULL);
+ kfree(chip);
+ return 0;
+}
+
+static struct i2c_driver max8925_driver = {
+ .driver = {
+ .name = "max8925",
+ .owner = THIS_MODULE,
+ },
+ .probe = max8925_probe,
+ .remove = __devexit_p(max8925_remove),
+ .id_table = max8925_id_table,
+};
+
+static int __init max8925_i2c_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&max8925_driver);
+ if (ret != 0)
+ pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
+ return ret;
+}
+subsys_initcall(max8925_i2c_init);
+
+static void __exit max8925_i2c_exit(void)
+{
+ i2c_del_driver(&max8925_driver);
+}
+module_exit(max8925_i2c_exit);
+
+MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
