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Subject[PATCH] MFD: Add U300 AB3100 core support v1
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This adds a core driver for the AB3100 mixed-signal circuit
found in the ST-Ericsson U300 series platforms. This driver
is a singleton proxy for all accesses to the AB3100
sub-drivers which will be merged on top of this one, RTC,
regulators, battery and system power control, vibrator,
LEDs, and an ALSA codec.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
---
drivers/mfd/Kconfig | 14 +
drivers/mfd/Makefile | 3 +-
drivers/mfd/ab3100-core.c | 859 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/ab3100.h | 73 ++++
4 files changed, 948 insertions(+), 1 deletions(-)
create mode 100755 drivers/mfd/ab3100-core.c
create mode 100644 include/linux/mfd/ab3100.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index ee3927a..61f0346 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -241,6 +241,20 @@ config PCF50633_GPIO
Say yes here if you want to include support GPIO for pins on
the PCF50633 chip.

+config AB3100_CORE
+ tristate "ST-Ericsson AB3100 Mixed Signal Circuit core functions"
+ depends on I2C
+ default y if ARCH_U300
+ help
+ Select this to enable the AB3100 Mixed Signal IC core
+ functionality. This connects to a AB3100 on the I2C bus
+ and expose a number of symbols needed for dependent devices
+ to read and write registers and subscribe to events from
+ this multi-functional IC. This is needed to use other features
+ of the AB3100 such as battery-backed RTC, charging control,
+ LEDs, vibrator, system power and temperature, power management
+ and ALSA sound.
+
endmenu

menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 3afb519..f5f3371 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -40,4 +40,5 @@ obj-$(CONFIG_PMIC_DA903X) += da903x.o

obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
-obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
\ No newline at end of file
+obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
+obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
new file mode 100755
index 0000000..8961a4c
--- /dev/null
+++ b/drivers/mfd/ab3100-core.c
@@ -0,0 +1,856 @@
+/*
+ * Copyright (C) 2007-2009 ST-Ericsson
+ * License terms: GNU General Public License (GPL) version 2
+ * Low-level core for exclusive access to the AB3100 IC on the I2C bus
+ * and some basic chip-configuration.
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/mfd/ab3100.h>
+
+/* These are the only registers inside AB3100 used in this main file */
+
+/* Interrupt event registers */
+#define AB3100_EVENTA1 0x21
+#define AB3100_EVENTA2 0x22
+#define AB3100_EVENTA3 0x23
+
+/* AB3100 DAC converter registers */
+#define AB3100_DIS 0x00
+#define AB3100_D0C 0x01
+#define AB3100_D1C 0x02
+#define AB3100_D2C 0x03
+#define AB3100_D3C 0x04
+
+/* Chip ID register */
+#define AB3100_CID 0x20
+
+/* AB3100 interrupt registers */
+#define AB3100_IMRA1 0x24
+#define AB3100_IMRA2 0x25
+#define AB3100_IMRA3 0x26
+#define AB3100_IMRB1 0x2B
+#define AB3100_IMRB2 0x2C
+#define AB3100_IMRB3 0x2D
+
+/* System Power Monitoring and control registers */
+#define AB3100_MCA 0x2E
+#define AB3100_MCB 0x2F
+
+/* SIM power up */
+#define AB3100_SUP 0x50
+
+/* Initial settings of ab3100 registers */
+#define DIS_SETTING 0xF0
+#define D0C_SETTING 0x00
+#define D1C_SETTING 0x00
+#define D2C_SETTING 0x00
+#define D3C_SETTING 0x00
+
+#define IMRA1_SETTING 0x00
+#define IMRA2_SETTING 0xFF
+#define IMRA3_SETTING 0x01
+#define IMRB1_SETTING 0xFF
+#define IMRB2_SETTING 0xFF
+#define IMRB3_SETTING 0xFF
+#define MCB_SETTING 0x30
+#define SUP_SETTING 0x00
+
+/*
+ * I2C communication
+ *
+ * The AB3100 is assigned address 0x48 (7-bit)
+ * Since the driver does not require SMBus support, we
+ * cannot be sure to probe for the device address here,
+ * so the boot loader or modprobe may need to pass in a parameter
+ * like ab3100-core.force=0,0x48.
+ *
+ */
+static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END };
+I2C_CLIENT_INSMOD_1(ab3100);
+
+/* Whether the chip has been initialized */
+static bool ab3100_initialized;
+/* Lock out concurrent accesses to the AB3100 registers */
+static DEFINE_MUTEX(ab3100_access_mutex);
+/* Self describing stuff */
+static struct i2c_client *ab3100_i2c_client;
+static char ab3100_chip_name[32];
+static u8 ab3100_chip_id;
+
+/* Event handling */
+struct event {
+ struct list_head node;
+ struct device *dev;
+ struct ab3100_event_mask event_mask;
+ void *client_data;
+ void (*cb_handler)(struct ab3100_event_mask, void *client_data);
+};
+/* The event list */
+static DEFINE_MUTEX(event_list_mutex);
+static LIST_HEAD(subscribers);
+/* Save the first reading of the event registers */
+static struct ab3100_event_mask startup_event_mask;
+static bool startup_events_read;
+
+u8 ab3100_get_chip_type()
+{
+ u8 chip = ABUNKNOWN;
+
+ switch (ab3100_chip_id & 0xf0) {
+ case 0xa0:
+ chip = AB3000;
+ break;
+ case 0xc0:
+ chip = AB3100;
+ break;
+ }
+ return chip;
+}
+EXPORT_SYMBOL(ab3100_get_chip_type);
+
+int ab3100_set_register(u8 reg, u8 regval)
+{
+ u8 regandval[2] = {reg, regval};
+ struct i2c_msg msgs[1];
+ int err = 0;
+
+ if (!ab3100_initialized)
+ return -ENODEV;
+
+ msgs[0].addr = ab3100_i2c_client->addr;
+ msgs[0].flags = 0;
+ msgs[0].len = 2;
+ msgs[0].buf = regandval;
+ err = mutex_lock_interruptible(&ab3100_access_mutex);
+ if (err)
+ return err;
+
+ /*
+ * A two-byte write message with the first byte containing the register
+ * number and the second byte containing the value to be written
+ * effectively sets a register in the AB3100.
+ */
+ if ((i2c_transfer(ab3100_i2c_client->adapter,
+ &msgs[0], 1)) != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: write error (write register)\n",
+ __func__);
+ err = -EIO;
+ }
+ mutex_unlock(&ab3100_access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_set_register);
+
+/*
+ * The test registers exist at an I2C bus address up one
+ * from the ordinary base. They are not supposed to be used
+ * in production code, but sometimes you have to do that
+ * anyway. It's currently only used from this file so declare
+ * it static and do not export.
+ */
+static int ab3100_set_test_register(u8 reg, u8 regval)
+{
+ u8 regandval[2] = {reg, regval};
+ struct i2c_msg msgs[1];
+ int err = 0;
+
+ if (!ab3100_initialized)
+ return -ENODEV;
+
+ msgs[0].addr = ab3100_i2c_client->addr + 1;
+ msgs[0].flags = 0;
+ msgs[0].len = 2;
+ msgs[0].buf = regandval;
+ err = mutex_lock_interruptible(&ab3100_access_mutex);
+ if (err)
+ return err;
+
+ /*
+ * A two-byte write message with the first byte containing the register
+ * number and the second byte containing the value to be written
+ * effectively sets a register in the AB3100.
+ */
+ if ((i2c_transfer(ab3100_i2c_client->adapter,
+ &msgs[0], 1)) != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: write error (write test register)\n",
+ __func__);
+ err = -EIO;
+ }
+ mutex_unlock(&ab3100_access_mutex);
+ return err;
+}
+
+int ab3100_get_register(u8 reg, u8 *regval)
+{
+ int err = 0;
+ struct i2c_msg msgs[2];
+
+ if (!ab3100_initialized)
+ return -ENODEV;
+
+ msgs[0].addr = ab3100_i2c_client->addr;
+ msgs[0].flags = 0;
+ msgs[0].len = 1;
+ msgs[0].buf = &reg;
+ msgs[1].addr = ab3100_i2c_client->addr;
+ msgs[1].flags = I2C_M_RD;
+ msgs[1].len = 1;
+ msgs[1].buf = regval;
+
+ err = mutex_lock_interruptible(&ab3100_access_mutex);
+ if (err)
+ return err;
+
+ /*
+ * AB3100 require an I2C "stop" command between each message, else
+ * it will not work. The only way of achieveing this with the
+ * message transport layer is to send the read and write messages
+ * separately.
+ */
+ if ((i2c_transfer(ab3100_i2c_client->adapter, &msgs[0], 1))
+ != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: read error (send register address)\n",
+ __func__);
+ err = -EIO;
+ goto get_reg_out_unlock;
+ }
+ if ((i2c_transfer(ab3100_i2c_client->adapter, &msgs[1], 1))
+ != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: read error (read register value)\n",
+ __func__);
+ err = -EIO;
+ }
+ get_reg_out_unlock:
+ mutex_unlock(&ab3100_access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_get_register);
+
+int ab3100_get_register_page(u8 first_reg, u8 *regvals, u8 numregs)
+{
+ int err = 0;
+ struct i2c_msg msgs[] = {
+ { 0, 0, 1, &first_reg },
+ { 0, I2C_M_RD, numregs, regvals },
+ };
+
+ msgs[0].addr = ab3100_i2c_client->addr;
+ msgs[1].addr = ab3100_i2c_client->addr;
+
+ if (ab3100_chip_id == 0xa0 ||
+ ab3100_chip_id == 0xa1)
+ /* These don't support paged reads */
+ return -EIO;
+
+ err = mutex_lock_interruptible(&ab3100_access_mutex);
+ if (err)
+ return err;
+
+ /*
+ * Paged read also require an I2C "stop" command.
+ */
+ if ((i2c_transfer(ab3100_i2c_client->adapter, &msgs[0], 1))
+ != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: read error (paged send first register address)\n",
+ __func__);
+ err = -EIO;
+ goto get_reg_page_out_unlock;
+ }
+ if ((i2c_transfer(ab3100_i2c_client->adapter, &msgs[1], 1))
+ != 1) {
+ dev_err(&ab3100_i2c_client->dev,
+ "%s: read error (paged read register values)\n",
+ __func__);
+ err = -EIO;
+ }
+ get_reg_page_out_unlock:
+ mutex_unlock(&ab3100_access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_get_register_page);
+
+int ab3100_mask_and_set_register(u8 reg, u8 andmask, u8 ormask)
+{
+ u8 regval;
+ int err = 0;
+
+ err = ab3100_get_register(reg, &regval);
+ if (err)
+ return err;
+
+ regval &= andmask;
+ regval |= ormask;
+
+ err = ab3100_set_register(reg, regval);
+ if (err)
+ return err;
+
+ return 0;
+}
+EXPORT_SYMBOL(ab3100_mask_and_set_register);
+
+/*
+ * Register a simple callback for handling any AB3100 events.
+ */
+int ab3100_event_cb_register(struct device *dev,
+ void (*cb_handler)
+ (struct ab3100_event_mask, void *client_data),
+ struct ab3100_event_mask *subscribe_mask,
+ void *client_data)
+{
+ struct event *p;
+
+ if ((dev == NULL) ||
+ ((subscribe_mask->event1 == 0) &&
+ (subscribe_mask->event2 == 0) &&
+ (subscribe_mask->event3 == 0)) ||
+ cb_handler == NULL)
+ return -EINVAL;
+
+ p = kmalloc(sizeof(struct event), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ p->dev = dev;
+ p->cb_handler = cb_handler;
+ memcpy(&p->event_mask, subscribe_mask,
+ sizeof(struct ab3100_event_mask));
+ p->client_data = client_data;
+
+ mutex_lock(&event_list_mutex);
+ list_add_tail(&p->node, &subscribers);
+ mutex_unlock(&event_list_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(ab3100_event_cb_register);
+
+/*
+ * Remove a previously registered callback.
+ */
+int ab3100_event_cb_unregister(struct device *dev)
+{
+ int err = -ENOENT;
+ struct event *e;
+
+ mutex_lock(&event_list_mutex);
+ list_for_each_entry(e, &subscribers, node) {
+ if (e->dev == dev) {
+ /* Found a client subscription => remove it */
+ list_del(&e->node);
+ kfree(e);
+ err = 0;
+ }
+ }
+ mutex_unlock(&event_list_mutex);
+
+ return err;
+}
+EXPORT_SYMBOL(ab3100_event_cb_unregister);
+
+
+int ab3100_event_registers_startup_state_get(struct ab3100_event_mask
+ *event_mask)
+{
+ if (!startup_events_read)
+ return -EAGAIN; /* Try again later */
+ memcpy(event_mask, &startup_event_mask,
+ sizeof(struct ab3100_event_mask));
+
+ return 0;
+}
+EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
+
+/* Interrupt handling worker */
+static void ab3100_work_cb(struct work_struct *work)
+{
+ struct event *e;
+ u8 event_regs[3];
+ struct ab3100_event_mask event_mask;
+ int err;
+
+ err = ab3100_get_register_page(AB3100_EVENTA1, event_regs, 3);
+ if (err)
+ goto err_event_wq;
+
+ event_mask.event1 = event_regs[0];
+ event_mask.event2 = event_regs[1];
+ event_mask.event3 = event_regs[2];
+
+ if (!startup_events_read) {
+ /* Save the first reading for detecting startup cause etc */
+ memcpy(&startup_event_mask, &event_mask,
+ sizeof(struct ab3100_event_mask));
+ startup_events_read = true;
+ }
+
+ /* Go through list of susbscribers */
+ mutex_lock(&event_list_mutex);
+ list_for_each_entry(e, &subscribers, node) {
+ /* Check if the client should be notified */
+ if ((e->event_mask.event1 & event_mask.event1) ||
+ (e->event_mask.event2 & event_mask.event2) ||
+ (e->event_mask.event3 & event_mask.event3)) {
+ e->cb_handler(event_mask, e->client_data);
+ }
+ }
+ mutex_unlock(&event_list_mutex);
+
+ dev_dbg(&ab3100_i2c_client->dev,
+ "IRQ Event: 0x%x 0x%x 0x%x\n",
+ event_regs[0], event_regs[1], event_regs[2]);
+
+ enable_irq(ab3100_i2c_client->irq);
+ return;
+
+ err_event_wq:
+ dev_dbg(&ab3100_i2c_client->dev,
+ "error in event workqueue\n");
+ /* Enable the IRQ anyway, what choice do we have? */
+ enable_irq(ab3100_i2c_client->irq);
+ return;
+}
+static DECLARE_WORK(ab3100_work, &ab3100_work_cb);
+
+static irqreturn_t ab3100_irq_handler(int irq, void *data)
+{
+ /*
+ * Disable the IRQ and dispatch a worker to handle the
+ * event. Since the chip resides on I2C this is slow
+ * stuff and we will re-enable the interrupts once th
+ * worker has finished.
+ */
+ disable_irq(ab3100_i2c_client->irq);
+ schedule_work(&ab3100_work);
+ return IRQ_HANDLED;
+}
+
+#if defined(CONFIG_U300_DEBUG) && defined(CONFIG_DEBUG_FS)
+/*
+ * Some debugfs entries only exposed if we're using debug
+ */
+static int ab3100_registers_print(struct seq_file *s, void *p)
+{
+ u8 value;
+ u8 reg;
+
+ seq_printf(s, "AB3100 registers:\n");
+
+ for (reg = 0; reg < 0xff; reg++) {
+ ab3100_get_register(reg, &value);
+ seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
+ }
+ return 0;
+}
+
+static int ab3100_registers_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ab3100_registers_print, inode->i_private);
+}
+
+static struct file_operations ab3100_registers_fops = {
+ .open = ab3100_registers_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static int ab3100_get_set_reg_open_file(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static int ab3100_get_set_reg(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ int mode = (int) file->private_data;
+ char buf[32];
+ int buf_size;
+ int regp;
+ unsigned long user_reg;
+ int err;
+ int i = 0;
+
+ /* Get userspace string and assure termination */
+ buf_size = min(count, (sizeof(buf)-1));
+ if (copy_from_user(buf, user_buf, buf_size))
+ return -EFAULT;
+ buf[buf_size] = 0;
+
+ /*
+ * The idea is here to parse a string which is either
+ * "0xnn" for reading a register, or "0xaa 0xbb" for
+ * writing 0xbb to the register 0xaa. First move past
+ * whitespace and then begin to parse the register.
+ */
+ while ((i < buf_size) && (buf[i] == ' '))
+ i++;
+ regp = i;
+
+ /*
+ * Advance pointer to end of string then terminate
+ * the register string. This is needed to satisfy
+ * the strict_strtoul() function.
+ */
+ while ((i < buf_size) && (buf[i] != ' '))
+ i++;
+ buf[i] = '\0';
+
+ err = strict_strtoul(&buf[regp], 16, &user_reg);
+ if (err)
+ return err;
+ if (user_reg > 0xff)
+ return -EINVAL;
+
+ /* Either we read or we write a register here */
+ if (!mode) {
+ /* Reading */
+ u8 reg = (u8) user_reg;
+ u8 regvalue;
+
+ ab3100_get_register(reg, &regvalue);
+
+ dev_info(&ab3100_i2c_client->dev,
+ "debug read AB3100 reg[0x%02x]: 0x%02x\n",
+ reg, regvalue);
+ } else {
+ int valp;
+ unsigned long user_value;
+ u8 reg = (u8) user_reg;
+ u8 value;
+ u8 regvalue;
+
+ /*
+ * Writing, we need some value to write to
+ * the register so keep parsing the string
+ * from userspace.
+ */
+ i++;
+ while ((i < buf_size) && (buf[i] == ' '))
+ i++;
+ valp = i;
+ while ((i < buf_size) && (buf[i] != ' '))
+ i++;
+ buf[i] = '\0';
+
+ err = strict_strtoul(&buf[valp], 16, &user_value);
+ if (err)
+ return err;
+ if (user_reg > 0xff)
+ return -EINVAL;
+
+ value = (u8) user_value;
+ ab3100_set_register(reg, value);
+ ab3100_get_register(reg, &regvalue);
+
+ dev_info(&ab3100_i2c_client->dev,
+ "debug write reg[0x%02x] with 0x%02x, "
+ "after readback: 0x%02x\n",
+ reg, value, regvalue);
+ }
+ return buf_size;
+}
+
+static const struct file_operations ab3100_get_set_reg_fops = {
+ .open = ab3100_get_set_reg_open_file,
+ .write = ab3100_get_set_reg,
+};
+
+static struct dentry *ab3100_dir;
+static struct dentry *ab3100_reg_file;
+static struct dentry *ab3100_get_reg_file;
+static struct dentry *ab3100_set_reg_file;
+
+static void ab3100_setup_debugfs(void)
+{
+ int err;
+
+ ab3100_dir = debugfs_create_dir("ab3100", NULL);
+ if (!ab3100_dir)
+ goto exit_no_debugfs;
+
+ ab3100_reg_file = debugfs_create_file("registers",
+ S_IRUGO, ab3100_dir, NULL,
+ &ab3100_registers_fops);
+ if (!ab3100_reg_file) {
+ err = -ENOMEM;
+ goto exit_destroy_dir;
+ }
+
+ ab3100_get_reg_file = debugfs_create_file("get_reg",
+ S_IRUGO, ab3100_dir, (void *) 0,
+ &ab3100_get_set_reg_fops);
+ if (!ab3100_get_reg_file) {
+ err = -ENOMEM;
+ goto exit_destroy_reg;
+ }
+
+ ab3100_set_reg_file = debugfs_create_file("set_reg",
+ S_IRUGO, ab3100_dir, (void *) 1,
+ &ab3100_get_set_reg_fops);
+ if (!ab3100_set_reg_file) {
+ err = -ENOMEM;
+ goto exit_destroy_get_reg;
+ }
+ return;
+
+ exit_destroy_get_reg:
+ debugfs_remove(ab3100_get_reg_file);
+ exit_destroy_reg:
+ debugfs_remove(ab3100_reg_file);
+ exit_destroy_dir:
+ debugfs_remove(ab3100_dir);
+ exit_no_debugfs:
+ return;
+}
+static inline void ab3100_remove_debugfs(void)
+{
+ debugfs_remove(ab3100_set_reg_file);
+ debugfs_remove(ab3100_get_reg_file);
+ debugfs_remove(ab3100_reg_file);
+ debugfs_remove(ab3100_dir);
+}
+#else
+static inline void ab3100_setup_debugfs(void)
+{
+}
+static inline void ab3100_remove_debugfs(void)
+{
+}
+#endif
+
+/*
+ * Basic set-up, datastructure creation/destruction and I2C interface.
+ * This sets up a default config in the AB3100 chip so that it
+ * will work as expected.
+ */
+static int __init ab3100_setup(void)
+{
+ int err = 0;
+
+ /* Force internal oscillator */
+ err = ab3100_set_register(AB3100_MCA, 0x01);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_MCB, MCB_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRA1, IMRA1_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRA2, IMRA2_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRA3, IMRA3_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRB1, IMRB1_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRB2, IMRB2_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_IMRB3, IMRB3_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_SUP, SUP_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_DIS, DIS_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_D0C, D0C_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_D1C, D1C_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_D2C, D2C_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ err = ab3100_set_register(AB3100_D3C, D3C_SETTING);
+ if (err)
+ goto exit_no_setup;
+
+ /*
+ * Special trick to make the AB3100 use the 32kHz clock (RTC)
+ * bit 3 in test registe 0x02 is a special, undocumented test
+ * register bit that only exist in AB3100 P1E
+ */
+ if (ab3100_chip_id == 0xc4) {
+ dev_warn(&ab3100_i2c_client->dev,
+ "AB3100 P1E variant detected, "
+ "forcing chip to 32KHz\n");
+ err = ab3100_set_test_register(0x02, 0x08);
+ }
+
+ exit_no_setup:
+ return err;
+}
+
+struct ab_family_id {
+ u8 id;
+ char *name;
+};
+
+const struct ab_family_id ids[] __initdata = {
+ {0xc0, "P1A"}, /* AB3100 */
+ {0xc1, "P1B"},
+ {0xc2, "P1C"},
+ {0xc3, "P1D"},
+ {0xc4, "P1E"},
+ {0xc5, "P1F/R1A"},
+ {0xc6, "P1G/R1A"},
+ {0xc7, "P2A/R2A"},
+ {0xc8, "P2B/R2B"},
+ {0xa0, NULL}, /* AB3000 */
+ {0xa1, NULL},
+ {0xa2, NULL},
+ {0xa3, NULL},
+ {0xa4, NULL},
+ {0xa5, NULL},
+ {0xa6, NULL},
+ {0xa7, NULL},
+ {0x00, NULL}
+};
+
+static int __init ab3100_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err;
+ int i;
+
+ ab3100_i2c_client = client;
+ ab3100_initialized = true;
+
+ /* Read chip ID register */
+ err = ab3100_get_register(AB3100_CID, &ab3100_chip_id);
+ if (err) {
+ dev_err(&client->dev,
+ "could not detect i2c bus for AB3100 analog"
+ "baseband chip\n");
+ goto exit_no_detect;
+ }
+
+ for (i = 0; ids[i].id != 0x0; i++) {
+ if (ids[i].id == ab3100_chip_id) {
+ if (ids[i].name != NULL) {
+ snprintf(&ab3100_chip_name[0], 31, "AB3100 %s",
+ ids[i].name);
+ break;
+ } else {
+ dev_err(&client->dev,
+ "AB3000 is no longer supported\n");
+ goto exit_no_detect;
+ }
+ }
+ }
+
+ if (ids[i].id == 0x0) {
+ dev_err(&client->dev, "Unknown chip id: 0x%x\n",
+ ab3100_chip_id);
+ goto exit_no_detect;
+ }
+
+ dev_info(&client->dev, "Detected chip: %s\n",
+ &ab3100_chip_name[0]);
+
+ err = ab3100_setup();
+ if (err)
+ goto exit_no_detect;
+
+ /* This real unpredictable IRQ is of course sampled for entropy */
+ err = request_irq(client->irq, ab3100_irq_handler,
+ IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
+ "AB3100 IRQ", NULL);
+ if (err)
+ goto exit_no_detect;
+
+ ab3100_setup_debugfs();
+
+ return 0;
+
+ exit_no_detect:
+ return err;
+}
+
+static int __exit ab3100_remove(struct i2c_client *client)
+{
+ struct event *e;
+
+ ab3100_remove_debugfs();
+ /* Free the list of event subscribers here */
+ mutex_lock(&event_list_mutex);
+ list_for_each_entry(e, &subscribers, node) {
+
+ /* Found a client subscription => remove it */
+ list_del(&e->node);
+ kfree(e);
+ }
+ mutex_unlock(&event_list_mutex);
+ return 0;
+}
+
+static const struct i2c_device_id ab3100_id[] = {
+ { "ab3100", ab3100 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ab3100_id);
+
+static struct i2c_driver ab3100_driver = {
+ .driver = {
+ .name = "ab3100",
+ .owner = THIS_MODULE,
+ },
+ .id_table = ab3100_id,
+ .probe = ab3100_probe,
+ .remove = __exit_p(ab3100_remove),
+};
+
+static int __init ab3100_i2c_init(void)
+{
+ return i2c_add_driver(&ab3100_driver);
+}
+
+static void __exit ab3100_i2c_exit(void)
+{
+ i2c_del_driver(&ab3100_driver);
+}
+
+subsys_initcall(ab3100_i2c_init);
+module_exit(ab3100_i2c_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+MODULE_DESCRIPTION("AB3100 core driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/ab3100.h b/include/linux/mfd/ab3100.h
new file mode 100644
index 0000000..ba04448
--- /dev/null
+++ b/include/linux/mfd/ab3100.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * AB3100 core access functions
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+
+#include <linux/device.h>
+
+#ifndef MFD_AB3100_H
+#define MFD_AB3100_H
+
+#define ABUNKNOWN 0
+#define AB3000 1
+#define AB3100 2
+
+/* AB3100, EVENTA1 register flags */
+#define AB3100_EVENTA1_ONSWA 0x01
+#define AB3100_EVENTA1_ONSWB 0x02
+#define AB3100_EVENTA1_ONSWC 0x04
+#define AB3100_EVENTA1_DCIO 0x08
+#define AB3100_EVENTA1_OVER_TEMP 0x10
+#define AB3100_EVENTA1_SIM_OFF 0x20
+#define AB3100_EVENTA1_VBUS 0x40
+#define AB3100_EVENTA1_VSET_USB 0x80
+
+#define AB3100_EVENTA2_READY_TX 0x01
+#define AB3100_EVENTA2_READY_RX 0x02
+#define AB3100_EVENTA2_OVERRUN_ERROR 0x04
+#define AB3100_EVENTA2_FRAMING_ERROR 0x08
+#define AB3100_EVENTA2_CHARG_OVERCURRENT 0x10
+#define AB3100_EVENTA2_MIDR 0x20
+#define AB3100_EVENTA2_BATTERY_REM 0x40
+#define AB3100_EVENTA2_ALARM 0x80
+
+/* AB3100, EVENTA3 register flags */
+#define AB3100_EVENTA3_ADC_TRIG5 0x01
+#define AB3100_EVENTA3_ADC_TRIG4 0x02
+#define AB3100_EVENTA3_ADC_TRIG3 0x04
+#define AB3100_EVENTA3_ADC_TRIG2 0x08
+#define AB3100_EVENTA3_ADC_TRIGVBAT 0x10
+
+#define AB3100_EVENTA3_ADC_TRIGVTX 0x20
+#define AB3100_EVENTA3_ADC_TRIG1 0x40
+#define AB3100_EVENTA3_ADC_TRIG0 0x80
+
+/* AB3100, STR register flags */
+#define AB3100_STR_ONSWA 0x01
+#define AB3100_STR_ONSWB 0x02
+#define AB3100_STR_ONSWC 0x04
+#define AB3100_STR_DCIO 0x08
+#define AB3100_STR_BOOT_MODE 0x10
+#define AB3100_STR_SIM_OFF 0x20
+#define AB3100_STR_BATT_REMOVAL 0x40
+#define AB3100_STR_VBUS 0x80
+
+struct ab3100_event_mask {
+ u8 event1;
+ u8 event2;
+ u8 event3;
+};
+
+int ab3100_set_register(u8 reg, u8 regval);
+int ab3100_get_register(u8 reg, u8 *regval);
+int ab3100_get_register_page(u8 first_reg, u8 *regvals, u8 numregs);
+int ab3100_mask_and_set_register(u8 reg, u8 andmask, u8 ormask);
+int ab3100_get_chipid(u8 *chipid);
+u8 ab3100_get_chip_type(void);
+int ab3100_event_cb_register(struct device *dev, void
(*cb_handler)(struct ab3100_event_mask, void *client_data), struct
ab3100_event_mask *subscribe_mask, void *client_data);
+int ab3100_event_cb_unregister(struct device *dev);
+int ab3100_event_registers_startup_state_get(struct ab3100_event_mask
*event_mask);
+
+#endif
--
1.6.2.1

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