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/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");