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Subject[PATCH 1/1] MFD: Add U300 AB3100 core support v4
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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>
Reviewed-by: Mike Rapoport <mike@compulab.co.il>
Reviewed-by: Samuel Ortiz <sameo@linux.intel.com>
Reviewed-by: Ben Dooks <ben-linux@fluff.org>
---
drivers/mfd/Kconfig | 14 +
drivers/mfd/Makefile | 3 +-
drivers/mfd/ab3100-core.c | 974 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/ab3100.h | 103 +++++
4 files changed, 1093 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..49f2bfb
--- /dev/null
+++ b/drivers/mfd/ab3100-core.c
@@ -0,0 +1,974 @@
+/*
+ * 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/notifier.h>
+#include <linux/err.h>
+#include <linux/platform_device.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
+
+/*
+ * I2C communication
+ *
+ * The AB3100 is usually assigned address 0x48 (7-bit)
+ * The chip is defined in the platform i2c_board_data section.
+ */
+static unsigned short normal_i2c[] = { 0x48, I2C_CLIENT_END };
+I2C_CLIENT_INSMOD_1(ab3100);
+
+/* A local all-containing singleton */
+static struct ab3100 *ab3100_local;
+
+u8 ab3100_get_chip_type(struct ab3100 *ab3100_data)
+{
+ u8 chip = ABUNKNOWN;
+
+ switch (ab3100_data->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(struct ab3100 *ab3100_data, u8 reg, u8 regval)
+{
+ u8 regandval[2] = {reg, regval};
+ int err;
+
+ err = mutex_lock_interruptible(&ab3100_data->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.
+ */
+ err = i2c_master_send(ab3100_data->i2c_client, regandval, 2);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (write register): %d\n",
+ err);
+ } else if (err != 2) {
+ dev_err(ab3100_data->dev,
+ "write error (write register) "
+ "%d bytes transferred (expected 2)\n",
+ err);
+ err = -EIO;
+ } else {
+ /* All is well */
+ err = 0;
+ }
+ mutex_unlock(&ab3100_data->access_mutex);
+ return 0;
+}
+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};
+ int err;
+
+ err = mutex_lock_interruptible(&ab3100_local->access_mutex);
+ if (err)
+ return err;
+
+ err = i2c_master_send(ab3100_local->testreg_client, regandval, 2);
+ if (err < 0) {
+ dev_err(ab3100_local->dev,
+ "write error (write test register): %d\n",
+ err);
+ } else if (err != 2) {
+ dev_err(ab3100_local->dev,
+ "write error (write test register) "
+ "%d bytes transferred (expected 2)\n",
+ err);
+ err = -EIO;
+ } else {
+ /* All is well */
+ err = 0;
+ }
+ mutex_unlock(&ab3100_local->access_mutex);
+
+ return err;
+}
+
+int ab3100_get_register(struct ab3100 *ab3100_data, u8 reg, u8 *regval)
+{
+ int err;
+
+ err = mutex_lock_interruptible(&ab3100_data->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.
+ */
+ err = i2c_master_send(ab3100_data->i2c_client, &reg, 1);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (send register address): %d\n",
+ err);
+ goto get_reg_out_unlock;
+ } else if (err != 1) {
+ dev_err(ab3100_data->dev,
+ "write error (send register address) "
+ "%d bytes transferred (expected 1)\n",
+ err);
+ err = -EIO;
+ goto get_reg_out_unlock;
+ } else {
+ /* All is well */
+ err = 0;
+ }
+
+ err = i2c_master_recv(ab3100_data->i2c_client, regval, 1);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (read register): %d\n",
+ err);
+ goto get_reg_out_unlock;
+ } else if (err != 1) {
+ dev_err(ab3100_data->dev,
+ "write error (read register) "
+ "%d bytes transferred (expected 1)\n",
+ err);
+ err = -EIO;
+ goto get_reg_out_unlock;
+ } else {
+ /* All is well */
+ err = 0;
+ }
+
+ get_reg_out_unlock:
+ mutex_unlock(&ab3100_data->access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_get_register);
+
+int ab3100_get_register_page(struct ab3100 *ab3100_data,
+ u8 first_reg, u8 *regvals, u8 numregs)
+{
+ int err;
+
+ if (ab3100_data->chip_id == 0xa0 ||
+ ab3100_data->chip_id == 0xa1)
+ /* These don't support paged reads */
+ return -EIO;
+
+ err = mutex_lock_interruptible(&ab3100_data->access_mutex);
+ if (err)
+ return err;
+
+ /*
+ * Paged read also require an I2C "stop" command.
+ */
+ err = i2c_master_send(ab3100_data->i2c_client, &first_reg, 1);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (send first register address): %d\n",
+ err);
+ goto get_reg_page_out_unlock;
+ } else if (err != 1) {
+ dev_err(ab3100_data->dev,
+ "write error (send first register address) "
+ "%d bytes transferred (expected 1)\n",
+ err);
+ err = -EIO;
+ goto get_reg_page_out_unlock;
+ }
+
+ err = i2c_master_recv(ab3100_data->i2c_client, regvals, numregs);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (read register page): %d\n",
+ err);
+ goto get_reg_page_out_unlock;
+ } else if (err != numregs) {
+ dev_err(ab3100_data->dev,
+ "write error (read register page) "
+ "%d bytes transferred (expected %d)\n",
+ err, numregs);
+ err = -EIO;
+ goto get_reg_page_out_unlock;
+ }
+
+ /* All is well */
+ err = 0;
+
+ get_reg_page_out_unlock:
+ mutex_unlock(&ab3100_data->access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_get_register_page);
+
+int ab3100_mask_and_set_register(struct ab3100 *ab3100_data,
+ u8 reg, u8 andmask, u8 ormask)
+{
+ u8 regandval[2] = {reg, 0};
+ int err;
+
+ err = mutex_lock_interruptible(&ab3100_data->access_mutex);
+ if (err)
+ return err;
+
+ /* First read out the target register */
+ err = i2c_master_send(ab3100_data->i2c_client, &reg, 1);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (maskset send address): %d\n",
+ err);
+ goto get_maskset_unlock;
+ } else if (err != 1) {
+ dev_err(ab3100_data->dev,
+ "write error (maskset send address) "
+ "%d bytes transferred (expected 1)\n",
+ err);
+ err = -EIO;
+ goto get_maskset_unlock;
+ }
+
+ err = i2c_master_recv(ab3100_data->i2c_client, &regandval[1], 1);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (maskset read register): %d\n",
+ err);
+ goto get_maskset_unlock;
+ } else if (err != 1) {
+ dev_err(ab3100_data->dev,
+ "write error (maskset read register) "
+ "%d bytes transferred (expected 1)\n",
+ err);
+ err = -EIO;
+ goto get_maskset_unlock;
+ }
+
+ /* Modify the register */
+ regandval[1] &= andmask;
+ regandval[1] |= ormask;
+
+ /* Write the register */
+ err = i2c_master_send(ab3100_data->i2c_client, regandval, 2);
+ if (err < 0) {
+ dev_err(ab3100_data->dev,
+ "write error (write register): %d\n",
+ err);
+ goto get_maskset_unlock;
+ } else if (err != 2) {
+ dev_err(ab3100_data->dev,
+ "write error (write register) "
+ "%d bytes transferred (expected 2)\n",
+ err);
+ err = -EIO;
+ goto get_maskset_unlock;
+ }
+
+ /* All is well */
+ err = 0;
+
+ get_maskset_unlock:
+ mutex_unlock(&ab3100_data->access_mutex);
+ return err;
+}
+EXPORT_SYMBOL(ab3100_mask_and_set_register);
+
+/*
+ * Register a simple callback for handling any AB3100 events.
+ */
+int ab3100_event_register(struct ab3100 *ab3100_data,
+ struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&ab3100_data->event_subscribers,
+ nb);
+}
+EXPORT_SYMBOL(ab3100_event_register);
+
+/*
+ * Remove a previously registered callback.
+ */
+int ab3100_event_unregister(struct ab3100 *ab3100_data,
+ struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&ab3100_data->event_subscribers,
+ nb);
+}
+EXPORT_SYMBOL(ab3100_event_unregister);
+
+
+int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100_data,
+ u32 *fatevent)
+{
+ if (!ab3100_data->startup_events_read)
+ return -EAGAIN; /* Try again later */
+ *fatevent = ab3100_data->startup_events;
+ return 0;
+}
+EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
+
+/* Interrupt handling worker */
+static void ab3100_work(struct work_struct *work)
+{
+ u8 event_regs[3];
+ u32 fatevent;
+ int err;
+
+ err = ab3100_get_register_page(ab3100_local, AB3100_EVENTA1,
+ event_regs, 3);
+ if (err)
+ goto err_event_wq;
+
+ fatevent = (event_regs[0] << 16) |
+ (event_regs[1] << 8) |
+ event_regs[2];
+
+ if (!ab3100_local->startup_events_read) {
+ ab3100_local->startup_events = fatevent;
+ ab3100_local->startup_events_read = true;
+ }
+ /*
+ * The notified parties will have to mask out the events
+ * they're interested in and react to them. They will be
+ * notified on all events, then they use the fatevent value
+ * to determine if they're interested.
+ */
+ blocking_notifier_call_chain(&ab3100_local->event_subscribers,
+ fatevent, NULL);
+
+ dev_dbg(ab3100_local->dev,
+ "IRQ Event: 0x%08x\n", fatevent);
+
+ /* By now the IRQ should be acked and deasserted so enable it again */
+ enable_irq(ab3100_local->i2c_client->irq);
+ return;
+
+ err_event_wq:
+ dev_dbg(ab3100_local->dev,
+ "error in event workqueue\n");
+ /* Enable the IRQ anyway, what choice do we have? */
+ enable_irq(ab3100_local->i2c_client->irq);
+ return;
+}
+
+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_local->i2c_client->irq);
+ schedule_work(&ab3100_local->work);
+ return IRQ_HANDLED;
+}
+
+#ifdef 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(ab3100_local, 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 const 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(ab3100_local, reg, &regvalue);
+
+ dev_info(ab3100_local->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(ab3100_local, reg, value);
+ ab3100_get_register(ab3100_local, reg, &regvalue);
+
+ dev_info(ab3100_local->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.
+ */
+
+struct ab3100_init_setting {
+ u8 abreg;
+ u8 setting;
+};
+
+static const struct ab3100_init_setting __initdata
+ab3100_init_settings[] = {
+ {
+ .abreg = AB3100_MCA,
+ .setting = 0x01
+ }, {
+ .abreg = AB3100_MCB,
+ .setting = 0x30
+ }, {
+ .abreg = AB3100_IMRA1,
+ .setting = 0x00
+ }, {
+ .abreg = AB3100_IMRA2,
+ .setting = 0xFF
+ }, {
+ .abreg = AB3100_IMRA3,
+ .setting = 0x01
+ }, {
+ .abreg = AB3100_IMRB1,
+ .setting = 0xFF
+ }, {
+ .abreg = AB3100_IMRB2,
+ .setting = 0xFF
+ }, {
+ .abreg = AB3100_IMRB3,
+ .setting = 0xFF
+ }, {
+ .abreg = AB3100_SUP,
+ .setting = 0x00
+ }, {
+ .abreg = AB3100_DIS,
+ .setting = 0xF0
+ }, {
+ .abreg = AB3100_D0C,
+ .setting = 0x00
+ }, {
+ .abreg = AB3100_D1C,
+ .setting = 0x00
+ }, {
+ .abreg = AB3100_D2C,
+ .setting = 0x00
+ }, {
+ .abreg = AB3100_D3C,
+ .setting = 0x00
+ },
+};
+
+static int __init ab3100_setup(void)
+{
+ int err = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
+ err = ab3100_set_register(ab3100_local,
+ ab3100_init_settings[i].abreg,
+ ab3100_init_settings[i].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_local->chip_id == 0xc4) {
+ dev_warn(ab3100_local->dev,
+ "AB3100 P1E variant detected, "
+ "forcing chip to 32KHz\n");
+ err = ab3100_set_test_register(0x02, 0x08);
+ }
+
+ exit_no_setup:
+ return err;
+}
+
+/*
+ * Here we define all the platform devices that appear
+ * as children of the AB3100. These are regular platform
+ * devices with the IORESOURCE_IO .start and .end set
+ * to correspond to the internal AB3100 register range
+ * mapping to the corresponding subdevice.
+ */
+
+#define AB3100_DEVICE(devname, devid) \
+static struct platform_device ab3100_##devname##_device = { \
+ .name = devid, \
+ .id = -1, \
+}
+
+/*
+ * This lists all the subdevices and corresponding register
+ * ranges.
+ */
+AB3100_DEVICE(dac, "ab3100-dac");
+AB3100_DEVICE(leds, "ab3100-leds");
+AB3100_DEVICE(power, "ab3100-power");
+AB3100_DEVICE(regulators, "ab3100-regulators");
+AB3100_DEVICE(sim, "ab3100-sim");
+AB3100_DEVICE(uart, "ab3100-uart");
+AB3100_DEVICE(rtc, "ab3100-rtc");
+AB3100_DEVICE(charger, "ab3100-charger");
+AB3100_DEVICE(boost, "ab3100-boost");
+AB3100_DEVICE(adc, "ab3100-adc");
+AB3100_DEVICE(fuelgauge, "ab3100-fuelgauge");
+AB3100_DEVICE(vibrator, "ab3100-vibrator");
+AB3100_DEVICE(otp, "ab3100-otp");
+AB3100_DEVICE(codec, "ab3100-codec");
+
+static struct platform_device *
+ab3100_platform_devs[] = {
+ &ab3100_dac_device,
+ &ab3100_leds_device,
+ &ab3100_power_device,
+ &ab3100_regulators_device,
+ &ab3100_sim_device,
+ &ab3100_uart_device,
+ &ab3100_rtc_device,
+ &ab3100_charger_device,
+ &ab3100_boost_device,
+ &ab3100_adc_device,
+ &ab3100_fuelgauge_device,
+ &ab3100_vibrator_device,
+ &ab3100_otp_device,
+ &ab3100_codec_device,
+};
+
+struct ab_family_id {
+ u8 id;
+ char *name;
+};
+
+static const struct ab_family_id ids[] __initdata = {
+ /* AB3100 */
+ {
+ .id = 0xc0,
+ .name = "P1A"
+ }, {
+ .id = 0xc1,
+ .name = "P1B"
+ }, {
+ .id = 0xc2,
+ .name = "P1C"
+ }, {
+ .id = 0xc3,
+ .name = "P1D"
+ }, {
+ .id = 0xc4,
+ .name = "P1E"
+ }, {
+ .id = 0xc5,
+ .name = "P1F/R1A"
+ }, {
+ .id = 0xc6,
+ .name = "P1G/R1A"
+ }, {
+ .id = 0xc7,
+ .name = "P2A/R2A"
+ }, {
+ .id = 0xc8,
+ .name = "P2B/R2B"
+ },
+ /* AB3000 variants, not supported */
+ {
+ .id = 0xa0
+ }, {
+ .id = 0xa1
+ }, {
+ .id = 0xa2
+ }, {
+ .id = 0xa3
+ }, {
+ .id = 0xa4
+ }, {
+ .id = 0xa5
+ }, {
+ .id = 0xa6
+ }, {
+ .id = 0xa7
+ },
+ /* Terminator */
+ {
+ .id = 0x00,
+ },
+};
+
+static int __init ab3100_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err;
+ int i;
+
+ ab3100_local = kzalloc(sizeof(struct ab3100), GFP_KERNEL);
+ if (!ab3100_local) {
+ dev_err(&client->dev, "could not allocate AB3100 device\n");
+ return -ENOMEM;
+ }
+
+ /* Initialize data structure */
+ mutex_init(&ab3100_local->access_mutex);
+ BLOCKING_INIT_NOTIFIER_HEAD(&ab3100_local->event_subscribers);
+
+ ab3100_local->i2c_client = client;
+ ab3100_local->dev = &ab3100_local->i2c_client->dev;
+
+ /* Read chip ID register */
+ err = ab3100_get_register(ab3100_local, AB3100_CID,
+ &ab3100_local->chip_id);
+ if (err) {
+ dev_err(&client->dev,
+ "could not communicate with the AB3100 analog "
+ "baseband chip\n");
+ goto exit_no_detect;
+ }
+
+ for (i = 0; ids[i].id != 0x0; i++) {
+ if (ids[i].id == ab3100_local->chip_id) {
+ if (ids[i].name != NULL) {
+ snprintf(&ab3100_local->chip_name[0],
+ sizeof(ab3100_local->chip_name) - 1,
+ "AB3100 %s",
+ ids[i].name);
+ break;
+ } else {
+ dev_err(&client->dev,
+ "AB3000 is not supported\n");
+ goto exit_no_detect;
+ }
+ }
+ }
+
+ if (ids[i].id == 0x0) {
+ dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
+ ab3100_local->chip_id);
+ dev_err(&client->dev, "accepting it anyway. Please update "
+ "the driver.\n");
+ goto exit_no_detect;
+ }
+
+ dev_info(&client->dev, "Detected chip: %s\n",
+ &ab3100_local->chip_name[0]);
+
+ /* Attach a second dummy i2c_client to the test register address */
+ ab3100_local->testreg_client = i2c_new_dummy(client->adapter,
+ client->addr + 1);
+ if (!ab3100_local->testreg_client) {
+ err = -ENOMEM;
+ goto exit_no_testreg_client;
+ }
+
+ strlcpy(ab3100_local->testreg_client->name, id->name,
+ sizeof(ab3100_local->testreg_client->name));
+
+ err = ab3100_setup();
+ if (err)
+ goto exit_no_setup;
+
+ INIT_WORK(&ab3100_local->work, ab3100_work);
+
+ /* 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", ab3100_local);
+ if (err)
+ goto exit_no_irq;
+
+ /* Set parent and a pointer back to the container in device data */
+ for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
+ ab3100_platform_devs[i]->dev.parent =
+ &client->dev;
+ platform_set_drvdata(ab3100_platform_devs[i], ab3100_local);
+ }
+
+ /* Register the platform devices */
+ platform_add_devices(ab3100_platform_devs,
+ ARRAY_SIZE(ab3100_platform_devs));
+
+ ab3100_setup_debugfs();
+
+ return 0;
+
+ exit_no_irq:
+ exit_no_setup:
+ i2c_unregister_device(ab3100_local->testreg_client);
+ exit_no_testreg_client:
+ exit_no_detect:
+ kfree(ab3100_local);
+ return err;
+}
+
+static int __exit ab3100_remove(struct i2c_client *client)
+{
+ int i;
+
+ /* Unregister subdevices */
+ for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++)
+ platform_device_unregister(ab3100_platform_devs[i]);
+
+ ab3100_remove_debugfs();
+ i2c_unregister_device(ab3100_local->testreg_client);
+
+ /*
+ * At this point, all subscribers should have unregistered
+ * their notifiers so deactivate IRQ
+ */
+ free_irq(client->irq, ab3100_local);
+ kfree(ab3100_local);
+ 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..6b930d6
--- /dev/null
+++ b/include/linux/mfd/ab3100.h
@@ -0,0 +1,103 @@
+/*
+ * 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, A2 and A3 event register flags
+ * these are catenated into a single 32-bit flag in the code
+ * for event notification broadcasts.
+ */
+#define AB3100_EVENTA1_ONSWA (0x01<<16)
+#define AB3100_EVENTA1_ONSWB (0x02<<16)
+#define AB3100_EVENTA1_ONSWC (0x04<<16)
+#define AB3100_EVENTA1_DCIO (0x08<<16)
+#define AB3100_EVENTA1_OVER_TEMP (0x10<<16)
+#define AB3100_EVENTA1_SIM_OFF (0x20<<16)
+#define AB3100_EVENTA1_VBUS (0x40<<16)
+#define AB3100_EVENTA1_VSET_USB (0x80<<16)
+
+#define AB3100_EVENTA2_READY_TX (0x01<<8)
+#define AB3100_EVENTA2_READY_RX (0x02<<8)
+#define AB3100_EVENTA2_OVERRUN_ERROR (0x04<<8)
+#define AB3100_EVENTA2_FRAMING_ERROR (0x08<<8)
+#define AB3100_EVENTA2_CHARG_OVERCURRENT (0x10<<8)
+#define AB3100_EVENTA2_MIDR (0x20<<8)
+#define AB3100_EVENTA2_BATTERY_REM (0x40<<8)
+#define AB3100_EVENTA2_ALARM (0x80<<8)
+
+#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
+ * @access_mutex: lock out concurrent accesses to the AB3100 registers
+ * @dev: pointer to the containing device
+ * @i2c_client: I2C client for this chip
+ * @testreg_client: secondary client for test registers
+ * @chip_name: name of this chip variant
+ * @chip_id: 8 bit chip ID for this chip variant
+ * @work: an event handling worker
+ * @event_subscribers: event subscribers are listed here
+ * @startup_events: a copy of the first reading of the event registers
+ * @startup_events_read: whether the first events have been read
+ *
+ * This struct is PRIVATE and devices using it should NOT
+ * access ANY fields. It is used as a token for calling the
+ * AB3100 functions.
+ */
+struct ab3100 {
+ struct mutex access_mutex;
+ struct device *dev;
+ struct i2c_client *i2c_client;
+ struct i2c_client *testreg_client;
+ char chip_name[32];
+ u8 chip_id;
+ struct work_struct work;
+ struct blocking_notifier_head event_subscribers;
+ u32 startup_events;
+ bool startup_events_read;
+};
+
+int ab3100_set_register(struct ab3100 *ab3100_data, u8 reg, u8 regval);
+int ab3100_get_register(struct ab3100 *ab3100_data, u8 reg, u8 *regval);
+int ab3100_get_register_page(struct ab3100 *ab3100_data,
+ u8 first_reg, u8 *regvals, u8 numregs);
+int ab3100_mask_and_set_register(struct ab3100 *ab3100_data,
+ u8 reg, u8 andmask, u8 ormask);
+u8 ab3100_get_chip_type(struct ab3100 *ab3100_data);
+int ab3100_event_register(struct ab3100 *ab3100_data,
+ struct notifier_block *nb);
+int ab3100_event_unregister(struct ab3100 *ab3100_data,
+ struct notifier_block *nb);
+int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100_data,
+ u32 *fatevent);
+
+#endif
--
1.6.2.1

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