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linux/drivers/mfd/ab3550-core.c

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/*
* Copyright (C) 2007-2010 ST-Ericsson
* License terms: GNU General Public License (GPL) version 2
* Low-level core for exclusive access to the AB3550 IC on the I2C bus
* and some basic chip-configuration.
* Author: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
* Author: Mattias Wallin <mattias.wallin@stericsson.com>
* Author: Rickard Andersson <rickard.andersson@stericsson.com>
*/
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/random.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/mfd/abx500.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/mfd/core.h>
#define AB3550_NAME_STRING "ab3550"
#define AB3550_ID_FORMAT_STRING "AB3550 %s"
#define AB3550_NUM_BANKS 2
#define AB3550_NUM_EVENT_REG 5
/* These are the only registers inside AB3550 used in this main file */
/* Chip ID register */
#define AB3550_CID_REG 0x20
/* Interrupt event registers */
#define AB3550_EVENT_BANK 0
#define AB3550_EVENT_REG 0x22
/* Read/write operation values. */
#define AB3550_PERM_RD (0x01)
#define AB3550_PERM_WR (0x02)
/* Read/write permissions. */
#define AB3550_PERM_RO (AB3550_PERM_RD)
#define AB3550_PERM_RW (AB3550_PERM_RD | AB3550_PERM_WR)
/**
* struct ab3550
* @access_mutex: lock out concurrent accesses to the AB registers
* @i2c_client: I2C client for this chip
* @chip_name: name of this chip variant
* @chip_id: 8 bit chip ID for this chip variant
* @mask_work: a worker for writing to mask registers
* @event_lock: a lock to protect the event_mask
* @event_mask: a local copy of the mask event registers
* @startup_events: a copy of the first reading of the event registers
* @startup_events_read: whether the first events have been read
*/
struct ab3550 {
struct mutex access_mutex;
struct i2c_client *i2c_client[AB3550_NUM_BANKS];
char chip_name[32];
u8 chip_id;
struct work_struct mask_work;
spinlock_t event_lock;
u8 event_mask[AB3550_NUM_EVENT_REG];
u8 startup_events[AB3550_NUM_EVENT_REG];
bool startup_events_read;
#ifdef CONFIG_DEBUG_FS
unsigned int debug_bank;
unsigned int debug_address;
#endif
};
/**
* struct ab3550_reg_range
* @first: the first address of the range
* @last: the last address of the range
* @perm: access permissions for the range
*/
struct ab3550_reg_range {
u8 first;
u8 last;
u8 perm;
};
/**
* struct ab3550_reg_ranges
* @count: the number of ranges in the list
* @range: the list of register ranges
*/
struct ab3550_reg_ranges {
u8 count;
const struct ab3550_reg_range *range;
};
/*
* Permissible register ranges for reading and writing per device and bank.
*
* The ranges must be listed in increasing address order, and no overlaps are
* allowed. It is assumed that write permission implies read permission
* (i.e. only RO and RW permissions should be used). Ranges with write
* permission must not be split up.
*/
#define NO_RANGE {.count = 0, .range = NULL,}
static struct
ab3550_reg_ranges ab3550_reg_ranges[AB3550_NUM_DEVICES][AB3550_NUM_BANKS] = {
[AB3550_DEVID_DAC] = {
NO_RANGE,
{
.count = 2,
.range = (struct ab3550_reg_range[]) {
{
.first = 0xb0,
.last = 0xba,
.perm = AB3550_PERM_RW,
},
{
.first = 0xbc,
.last = 0xc3,
.perm = AB3550_PERM_RW,
},
},
},
},
[AB3550_DEVID_LEDS] = {
NO_RANGE,
{
.count = 2,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x5a,
.last = 0x88,
.perm = AB3550_PERM_RW,
},
{
.first = 0x8a,
.last = 0xad,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_POWER] = {
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x21,
.last = 0x21,
.perm = AB3550_PERM_RO,
},
}
},
NO_RANGE,
},
[AB3550_DEVID_REGULATORS] = {
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x69,
.last = 0xa3,
.perm = AB3550_PERM_RW,
},
}
},
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x14,
.last = 0x16,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_SIM] = {
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x21,
.last = 0x21,
.perm = AB3550_PERM_RO,
},
}
},
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x14,
.last = 0x17,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_UART] = {
NO_RANGE,
NO_RANGE,
},
[AB3550_DEVID_RTC] = {
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x00,
.last = 0x0c,
.perm = AB3550_PERM_RW,
},
}
},
NO_RANGE,
},
[AB3550_DEVID_CHARGER] = {
{
.count = 2,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x10,
.last = 0x1a,
.perm = AB3550_PERM_RW,
},
{
.first = 0x21,
.last = 0x21,
.perm = AB3550_PERM_RO,
},
}
},
NO_RANGE,
},
[AB3550_DEVID_ADC] = {
NO_RANGE,
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x20,
.last = 0x56,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_FUELGAUGE] = {
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x21,
.last = 0x21,
.perm = AB3550_PERM_RO,
},
}
},
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x00,
.last = 0x0e,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_VIBRATOR] = {
NO_RANGE,
{
.count = 1,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x10,
.last = 0x13,
.perm = AB3550_PERM_RW,
},
}
},
},
[AB3550_DEVID_CODEC] = {
{
.count = 2,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x31,
.last = 0x63,
.perm = AB3550_PERM_RW,
},
{
.first = 0x65,
.last = 0x68,
.perm = AB3550_PERM_RW,
},
}
},
NO_RANGE,
},
};
static struct mfd_cell ab3550_devs[AB3550_NUM_DEVICES] = {
[AB3550_DEVID_DAC] = {
.name = "ab3550-dac",
.id = AB3550_DEVID_DAC,
.num_resources = 0,
},
[AB3550_DEVID_LEDS] = {
.name = "ab3550-leds",
.id = AB3550_DEVID_LEDS,
},
[AB3550_DEVID_POWER] = {
.name = "ab3550-power",
.id = AB3550_DEVID_POWER,
},
[AB3550_DEVID_REGULATORS] = {
.name = "ab3550-regulators",
.id = AB3550_DEVID_REGULATORS,
},
[AB3550_DEVID_SIM] = {
.name = "ab3550-sim",
.id = AB3550_DEVID_SIM,
},
[AB3550_DEVID_UART] = {
.name = "ab3550-uart",
.id = AB3550_DEVID_UART,
},
[AB3550_DEVID_RTC] = {
.name = "ab3550-rtc",
.id = AB3550_DEVID_RTC,
},
[AB3550_DEVID_CHARGER] = {
.name = "ab3550-charger",
.id = AB3550_DEVID_CHARGER,
},
[AB3550_DEVID_ADC] = {
.name = "ab3550-adc",
.id = AB3550_DEVID_ADC,
.num_resources = 10,
.resources = (struct resource[]) {
{
.name = "TRIGGER-0",
.flags = IORESOURCE_IRQ,
.start = 16,
.end = 16,
},
{
.name = "TRIGGER-1",
.flags = IORESOURCE_IRQ,
.start = 17,
.end = 17,
},
{
.name = "TRIGGER-2",
.flags = IORESOURCE_IRQ,
.start = 18,
.end = 18,
},
{
.name = "TRIGGER-3",
.flags = IORESOURCE_IRQ,
.start = 19,
.end = 19,
},
{
.name = "TRIGGER-4",
.flags = IORESOURCE_IRQ,
.start = 20,
.end = 20,
},
{
.name = "TRIGGER-5",
.flags = IORESOURCE_IRQ,
.start = 21,
.end = 21,
},
{
.name = "TRIGGER-6",
.flags = IORESOURCE_IRQ,
.start = 22,
.end = 22,
},
{
.name = "TRIGGER-7",
.flags = IORESOURCE_IRQ,
.start = 23,
.end = 23,
},
{
.name = "TRIGGER-VBAT-TXON",
.flags = IORESOURCE_IRQ,
.start = 13,
.end = 13,
},
{
.name = "TRIGGER-VBAT",
.flags = IORESOURCE_IRQ,
.start = 12,
.end = 12,
},
},
},
[AB3550_DEVID_FUELGAUGE] = {
.name = "ab3550-fuelgauge",
.id = AB3550_DEVID_FUELGAUGE,
},
[AB3550_DEVID_VIBRATOR] = {
.name = "ab3550-vibrator",
.id = AB3550_DEVID_VIBRATOR,
},
[AB3550_DEVID_CODEC] = {
.name = "ab3550-codec",
.id = AB3550_DEVID_CODEC,
},
};
/*
* I2C transactions with error messages.
*/
static int ab3550_i2c_master_send(struct ab3550 *ab, u8 bank, u8 *data,
u8 count)
{
int err;
err = i2c_master_send(ab->i2c_client[bank], data, count);
if (err < 0) {
dev_err(&ab->i2c_client[0]->dev, "send error: %d\n", err);
return err;
}
return 0;
}
static int ab3550_i2c_master_recv(struct ab3550 *ab, u8 bank, u8 *data,
u8 count)
{
int err;
err = i2c_master_recv(ab->i2c_client[bank], data, count);
if (err < 0) {
dev_err(&ab->i2c_client[0]->dev, "receive error: %d\n", err);
return err;
}
return 0;
}
/*
* Functionality for getting/setting register values.
*/
static int get_register_interruptible(struct ab3550 *ab, u8 bank, u8 reg,
u8 *value)
{
int err;
err = mutex_lock_interruptible(&ab->access_mutex);
if (err)
return err;
err = ab3550_i2c_master_send(ab, bank, &reg, 1);
if (!err)
err = ab3550_i2c_master_recv(ab, bank, value, 1);
mutex_unlock(&ab->access_mutex);
return err;
}
static int get_register_page_interruptible(struct ab3550 *ab, u8 bank,
u8 first_reg, u8 *regvals, u8 numregs)
{
int err;
err = mutex_lock_interruptible(&ab->access_mutex);
if (err)
return err;
err = ab3550_i2c_master_send(ab, bank, &first_reg, 1);
if (!err)
err = ab3550_i2c_master_recv(ab, bank, regvals, numregs);
mutex_unlock(&ab->access_mutex);
return err;
}
static int mask_and_set_register_interruptible(struct ab3550 *ab, u8 bank,
u8 reg, u8 bitmask, u8 bitvalues)
{
int err = 0;
if (likely(bitmask)) {
u8 reg_bits[2] = {reg, 0};
err = mutex_lock_interruptible(&ab->access_mutex);
if (err)
return err;
if (bitmask == 0xFF) /* No need to read in this case. */
reg_bits[1] = bitvalues;
else { /* Read and modify the register value. */
u8 bits;
err = ab3550_i2c_master_send(ab, bank, &reg, 1);
if (err)
goto unlock_and_return;
err = ab3550_i2c_master_recv(ab, bank, &bits, 1);
if (err)
goto unlock_and_return;
reg_bits[1] = ((~bitmask & bits) |
(bitmask & bitvalues));
}
/* Write the new value. */
err = ab3550_i2c_master_send(ab, bank, reg_bits, 2);
unlock_and_return:
mutex_unlock(&ab->access_mutex);
}
return err;
}
/*
* Read/write permission checking functions.
*/
static bool page_write_allowed(const struct ab3550_reg_ranges *ranges,
u8 first_reg, u8 last_reg)
{
u8 i;
if (last_reg < first_reg)
return false;
for (i = 0; i < ranges->count; i++) {
if (first_reg < ranges->range[i].first)
break;
if ((last_reg <= ranges->range[i].last) &&
(ranges->range[i].perm & AB3550_PERM_WR))
return true;
}
return false;
}
static bool reg_write_allowed(const struct ab3550_reg_ranges *ranges, u8 reg)
{
return page_write_allowed(ranges, reg, reg);
}
static bool page_read_allowed(const struct ab3550_reg_ranges *ranges,
u8 first_reg, u8 last_reg)
{
u8 i;
if (last_reg < first_reg)
return false;
/* Find the range (if it exists in the list) that includes first_reg. */
for (i = 0; i < ranges->count; i++) {
if (first_reg < ranges->range[i].first)
return false;
if (first_reg <= ranges->range[i].last)
break;
}
/* Make sure that the entire range up to and including last_reg is
* readable. This may span several of the ranges in the list.
*/
while ((i < ranges->count) &&
(ranges->range[i].perm & AB3550_PERM_RD)) {
if (last_reg <= ranges->range[i].last)
return true;
if ((++i >= ranges->count) ||
(ranges->range[i].first !=
(ranges->range[i - 1].last + 1))) {
break;
}
}
return false;
}
static bool reg_read_allowed(const struct ab3550_reg_ranges *ranges, u8 reg)
{
return page_read_allowed(ranges, reg, reg);
}
/*
* The register access functionality.
*/
static int ab3550_get_chip_id(struct device *dev)
{
struct ab3550 *ab = dev_get_drvdata(dev->parent);
return (int)ab->chip_id;
}
static int ab3550_mask_and_set_register_interruptible(struct device *dev,
u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
{
struct ab3550 *ab;
struct platform_device *pdev = to_platform_device(dev);
if ((AB3550_NUM_BANKS <= bank) ||
!reg_write_allowed(&ab3550_reg_ranges[pdev->id][bank], reg))
return -EINVAL;
ab = dev_get_drvdata(dev->parent);
return mask_and_set_register_interruptible(ab, bank, reg,
bitmask, bitvalues);
}
static int ab3550_set_register_interruptible(struct device *dev, u8 bank,
u8 reg, u8 value)
{
return ab3550_mask_and_set_register_interruptible(dev, bank, reg, 0xFF,
value);
}
static int ab3550_get_register_interruptible(struct device *dev, u8 bank,
u8 reg, u8 *value)
{
struct ab3550 *ab;
struct platform_device *pdev = to_platform_device(dev);
if ((AB3550_NUM_BANKS <= bank) ||
!reg_read_allowed(&ab3550_reg_ranges[pdev->id][bank], reg))
return -EINVAL;
ab = dev_get_drvdata(dev->parent);
return get_register_interruptible(ab, bank, reg, value);
}
static int ab3550_get_register_page_interruptible(struct device *dev, u8 bank,
u8 first_reg, u8 *regvals, u8 numregs)
{
struct ab3550 *ab;
struct platform_device *pdev = to_platform_device(dev);
if ((AB3550_NUM_BANKS <= bank) ||
!page_read_allowed(&ab3550_reg_ranges[pdev->id][bank],
first_reg, (first_reg + numregs - 1)))
return -EINVAL;
ab = dev_get_drvdata(dev->parent);
return get_register_page_interruptible(ab, bank, first_reg, regvals,
numregs);
}
static int ab3550_event_registers_startup_state_get(struct device *dev,
u8 *event)
{
struct ab3550 *ab;
ab = dev_get_drvdata(dev->parent);
if (!ab->startup_events_read)
return -EAGAIN; /* Try again later */
memcpy(event, ab->startup_events, AB3550_NUM_EVENT_REG);
return 0;
}
static int ab3550_startup_irq_enabled(struct device *dev, unsigned int irq)
{
struct ab3550 *ab;
struct ab3550_platform_data *plf_data;
bool val;
ab = get_irq_chip_data(irq);
plf_data = ab->i2c_client[0]->dev.platform_data;
irq -= plf_data->irq.base;
val = ((ab->startup_events[irq / 8] & BIT(irq % 8)) != 0);
return val;
}
static struct abx500_ops ab3550_ops = {
.get_chip_id = ab3550_get_chip_id,
.get_register = ab3550_get_register_interruptible,
.set_register = ab3550_set_register_interruptible,
.get_register_page = ab3550_get_register_page_interruptible,
.set_register_page = NULL,
.mask_and_set_register = ab3550_mask_and_set_register_interruptible,
.event_registers_startup_state_get =
ab3550_event_registers_startup_state_get,
.startup_irq_enabled = ab3550_startup_irq_enabled,
};
static irqreturn_t ab3550_irq_handler(int irq, void *data)
{
struct ab3550 *ab = data;
int err;
unsigned int i;
u8 e[AB3550_NUM_EVENT_REG];
u8 *events;
unsigned long flags;
events = (ab->startup_events_read ? e : ab->startup_events);
err = get_register_page_interruptible(ab, AB3550_EVENT_BANK,
AB3550_EVENT_REG, events, AB3550_NUM_EVENT_REG);
if (err)
goto err_event_rd;
if (!ab->startup_events_read) {
dev_info(&ab->i2c_client[0]->dev,
"startup events 0x%x,0x%x,0x%x,0x%x,0x%x\n",
ab->startup_events[0], ab->startup_events[1],
ab->startup_events[2], ab->startup_events[3],
ab->startup_events[4]);
ab->startup_events_read = true;
goto out;
}
/* The two highest bits in event[4] are not used. */
events[4] &= 0x3f;
spin_lock_irqsave(&ab->event_lock, flags);
for (i = 0; i < AB3550_NUM_EVENT_REG; i++)
events[i] &= ~ab->event_mask[i];
spin_unlock_irqrestore(&ab->event_lock, flags);
for (i = 0; i < AB3550_NUM_EVENT_REG; i++) {
u8 bit;
u8 event_reg;
dev_dbg(&ab->i2c_client[0]->dev, "IRQ Event[%d]: 0x%2x\n",
i, events[i]);
event_reg = events[i];
for (bit = 0; event_reg; bit++, event_reg /= 2) {
if (event_reg % 2) {
unsigned int irq;
struct ab3550_platform_data *plf_data;
plf_data = ab->i2c_client[0]->dev.platform_data;
irq = plf_data->irq.base + (i * 8) + bit;
handle_nested_irq(irq);
}
}
}
out:
return IRQ_HANDLED;
err_event_rd:
dev_dbg(&ab->i2c_client[0]->dev, "error reading event registers\n");
return IRQ_HANDLED;
}
#ifdef CONFIG_DEBUG_FS
static struct ab3550_reg_ranges debug_ranges[AB3550_NUM_BANKS] = {
{
.count = 6,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x00,
.last = 0x0e,
},
{
.first = 0x10,
.last = 0x1a,
},
{
.first = 0x1e,
.last = 0x4f,
},
{
.first = 0x51,
.last = 0x63,
},
{
.first = 0x65,
.last = 0xa3,
},
{
.first = 0xa5,
.last = 0xa8,
},
}
},
{
.count = 8,
.range = (struct ab3550_reg_range[]) {
{
.first = 0x00,
.last = 0x0e,
},
{
.first = 0x10,
.last = 0x17,
},
{
.first = 0x1a,
.last = 0x1c,
},
{
.first = 0x20,
.last = 0x56,
},
{
.first = 0x5a,
.last = 0x88,
},
{
.first = 0x8a,
.last = 0xad,
},
{
.first = 0xb0,
.last = 0xba,
},
{
.first = 0xbc,
.last = 0xc3,
},
}
},
};
static int ab3550_registers_print(struct seq_file *s, void *p)
{
struct ab3550 *ab = s->private;
int bank;
seq_printf(s, AB3550_NAME_STRING " register values:\n");
for (bank = 0; bank < AB3550_NUM_BANKS; bank++) {
unsigned int i;
seq_printf(s, " bank %d:\n", bank);
for (i = 0; i < debug_ranges[bank].count; i++) {
u8 reg;
for (reg = debug_ranges[bank].range[i].first;
reg <= debug_ranges[bank].range[i].last;
reg++) {
u8 value;
get_register_interruptible(ab, bank, reg,
&value);
seq_printf(s, " [%d/0x%02X]: 0x%02X\n", bank,
reg, value);
}
}
}
return 0;
}
static int ab3550_registers_open(struct inode *inode, struct file *file)
{
return single_open(file, ab3550_registers_print, inode->i_private);
}
static const struct file_operations ab3550_registers_fops = {
.open = ab3550_registers_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int ab3550_bank_print(struct seq_file *s, void *p)
{
struct ab3550 *ab = s->private;
seq_printf(s, "%d\n", ab->debug_bank);
return 0;
}
static int ab3550_bank_open(struct inode *inode, struct file *file)
{
return single_open(file, ab3550_bank_print, inode->i_private);
}
static ssize_t ab3550_bank_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
char buf[32];
int buf_size;
unsigned long user_bank;
int err;
/* 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;
err = strict_strtoul(buf, 0, &user_bank);
if (err)
return -EINVAL;
if (user_bank >= AB3550_NUM_BANKS) {
dev_err(&ab->i2c_client[0]->dev,
"debugfs error input > number of banks\n");
return -EINVAL;
}
ab->debug_bank = user_bank;
return buf_size;
}
static int ab3550_address_print(struct seq_file *s, void *p)
{
struct ab3550 *ab = s->private;
seq_printf(s, "0x%02X\n", ab->debug_address);
return 0;
}
static int ab3550_address_open(struct inode *inode, struct file *file)
{
return single_open(file, ab3550_address_print, inode->i_private);
}
static ssize_t ab3550_address_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
char buf[32];
int buf_size;
unsigned long user_address;
int err;
/* 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;
err = strict_strtoul(buf, 0, &user_address);
if (err)
return -EINVAL;
if (user_address > 0xff) {
dev_err(&ab->i2c_client[0]->dev,
"debugfs error input > 0xff\n");
return -EINVAL;
}
ab->debug_address = user_address;
return buf_size;
}
static int ab3550_val_print(struct seq_file *s, void *p)
{
struct ab3550 *ab = s->private;
int err;
u8 regvalue;
err = get_register_interruptible(ab, (u8)ab->debug_bank,
(u8)ab->debug_address, &regvalue);
if (err)
return -EINVAL;
seq_printf(s, "0x%02X\n", regvalue);
return 0;
}
static int ab3550_val_open(struct inode *inode, struct file *file)
{
return single_open(file, ab3550_val_print, inode->i_private);
}
static ssize_t ab3550_val_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ab3550 *ab = ((struct seq_file *)(file->private_data))->private;
char buf[32];
int buf_size;
unsigned long user_val;
int err;
u8 regvalue;
/* 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;
err = strict_strtoul(buf, 0, &user_val);
if (err)
return -EINVAL;
if (user_val > 0xff) {
dev_err(&ab->i2c_client[0]->dev,
"debugfs error input > 0xff\n");
return -EINVAL;
}
err = mask_and_set_register_interruptible(
ab, (u8)ab->debug_bank,
(u8)ab->debug_address, 0xFF, (u8)user_val);
if (err)
return -EINVAL;
get_register_interruptible(ab, (u8)ab->debug_bank,
(u8)ab->debug_address, &regvalue);
if (err)
return -EINVAL;
return buf_size;
}
static const struct file_operations ab3550_bank_fops = {
.open = ab3550_bank_open,
.write = ab3550_bank_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static const struct file_operations ab3550_address_fops = {
.open = ab3550_address_open,
.write = ab3550_address_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static const struct file_operations ab3550_val_fops = {
.open = ab3550_val_open,
.write = ab3550_val_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static struct dentry *ab3550_dir;
static struct dentry *ab3550_reg_file;
static struct dentry *ab3550_bank_file;
static struct dentry *ab3550_address_file;
static struct dentry *ab3550_val_file;
static inline void ab3550_setup_debugfs(struct ab3550 *ab)
{
ab->debug_bank = 0;
ab->debug_address = 0x00;
ab3550_dir = debugfs_create_dir(AB3550_NAME_STRING, NULL);
if (!ab3550_dir)
goto exit_no_debugfs;
ab3550_reg_file = debugfs_create_file("all-registers",
S_IRUGO, ab3550_dir, ab, &ab3550_registers_fops);
if (!ab3550_reg_file)
goto exit_destroy_dir;
ab3550_bank_file = debugfs_create_file("register-bank",
(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_bank_fops);
if (!ab3550_bank_file)
goto exit_destroy_reg;
ab3550_address_file = debugfs_create_file("register-address",
(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_address_fops);
if (!ab3550_address_file)
goto exit_destroy_bank;
ab3550_val_file = debugfs_create_file("register-value",
(S_IRUGO | S_IWUGO), ab3550_dir, ab, &ab3550_val_fops);
if (!ab3550_val_file)
goto exit_destroy_address;
return;
exit_destroy_address:
debugfs_remove(ab3550_address_file);
exit_destroy_bank:
debugfs_remove(ab3550_bank_file);
exit_destroy_reg:
debugfs_remove(ab3550_reg_file);
exit_destroy_dir:
debugfs_remove(ab3550_dir);
exit_no_debugfs:
dev_err(&ab->i2c_client[0]->dev, "failed to create debugfs entries.\n");
return;
}
static inline void ab3550_remove_debugfs(void)
{
debugfs_remove(ab3550_val_file);
debugfs_remove(ab3550_address_file);
debugfs_remove(ab3550_bank_file);
debugfs_remove(ab3550_reg_file);
debugfs_remove(ab3550_dir);
}
#else /* !CONFIG_DEBUG_FS */
static inline void ab3550_setup_debugfs(struct ab3550 *ab)
{
}
static inline void ab3550_remove_debugfs(void)
{
}
#endif
/*
* Basic set-up, datastructure creation/destruction and I2C interface.
* This sets up a default config in the AB3550 chip so that it
* will work as expected.
*/
static int __init ab3550_setup(struct ab3550 *ab)
{
int err = 0;
int i;
struct ab3550_platform_data *plf_data;
struct abx500_init_settings *settings;
plf_data = ab->i2c_client[0]->dev.platform_data;
settings = plf_data->init_settings;
for (i = 0; i < plf_data->init_settings_sz; i++) {
err = mask_and_set_register_interruptible(ab,
settings[i].bank,
settings[i].reg,
0xFF, settings[i].setting);
if (err)
goto exit_no_setup;
/* If event mask register update the event mask in ab3550 */
if ((settings[i].bank == 0) &&
(AB3550_IMR1 <= settings[i].reg) &&
(settings[i].reg <= AB3550_IMR5)) {
ab->event_mask[settings[i].reg - AB3550_IMR1] =
settings[i].setting;
}
}
exit_no_setup:
return err;
}
static void ab3550_mask_work(struct work_struct *work)
{
struct ab3550 *ab = container_of(work, struct ab3550, mask_work);
int i;
unsigned long flags;
u8 mask[AB3550_NUM_EVENT_REG];
spin_lock_irqsave(&ab->event_lock, flags);
for (i = 0; i < AB3550_NUM_EVENT_REG; i++)
mask[i] = ab->event_mask[i];
spin_unlock_irqrestore(&ab->event_lock, flags);
for (i = 0; i < AB3550_NUM_EVENT_REG; i++) {
int err;
err = mask_and_set_register_interruptible(ab, 0,
(AB3550_IMR1 + i), ~0, mask[i]);
if (err)
dev_err(&ab->i2c_client[0]->dev,
"ab3550_mask_work failed 0x%x,0x%x\n",
(AB3550_IMR1 + i), mask[i]);
}
}
static void ab3550_mask(struct irq_data *data)
{
unsigned long flags;
struct ab3550 *ab;
struct ab3550_platform_data *plf_data;
int irq;
ab = irq_data_get_irq_chip_data(data);
plf_data = ab->i2c_client[0]->dev.platform_data;
irq = data->irq - plf_data->irq.base;
spin_lock_irqsave(&ab->event_lock, flags);
ab->event_mask[irq / 8] |= BIT(irq % 8);
spin_unlock_irqrestore(&ab->event_lock, flags);
schedule_work(&ab->mask_work);
}
static void ab3550_unmask(struct irq_data *data)
{
unsigned long flags;
struct ab3550 *ab;
struct ab3550_platform_data *plf_data;
int irq;
ab = irq_data_get_irq_chip_data(data);
plf_data = ab->i2c_client[0]->dev.platform_data;
irq = data->irq - plf_data->irq.base;
spin_lock_irqsave(&ab->event_lock, flags);
ab->event_mask[irq / 8] &= ~BIT(irq % 8);
spin_unlock_irqrestore(&ab->event_lock, flags);
schedule_work(&ab->mask_work);
}
static void noop(struct irq_data *data)
{
}
static struct irq_chip ab3550_irq_chip = {
.name = "ab3550-core", /* Keep the same name as the request */
.irq_disable = ab3550_mask, /* No default to mask in chip.c */
.irq_ack = noop,
.irq_mask = ab3550_mask,
.irq_unmask = ab3550_unmask,
};
struct ab_family_id {
u8 id;
char *name;
};
static const struct ab_family_id ids[] __initdata = {
/* AB3550 */
{
.id = AB3550_P1A,
.name = "P1A"
},
/* Terminator */
{
.id = 0x00,
}
};
static int __init ab3550_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ab3550 *ab;
struct ab3550_platform_data *ab3550_plf_data =
client->dev.platform_data;
int err;
int i;
int num_i2c_clients = 0;
ab = kzalloc(sizeof(struct ab3550), GFP_KERNEL);
if (!ab) {
dev_err(&client->dev,
"could not allocate " AB3550_NAME_STRING " device\n");
return -ENOMEM;
}
/* Initialize data structure */
mutex_init(&ab->access_mutex);
spin_lock_init(&ab->event_lock);
ab->i2c_client[0] = client;
i2c_set_clientdata(client, ab);
/* Read chip ID register */
err = get_register_interruptible(ab, 0, AB3550_CID_REG, &ab->chip_id);
if (err) {
dev_err(&client->dev, "could not communicate with the analog "
"baseband chip\n");
goto exit_no_detect;
}
for (i = 0; ids[i].id != 0x0; i++) {
if (ids[i].id == ab->chip_id) {
snprintf(&ab->chip_name[0], sizeof(ab->chip_name) - 1,
AB3550_ID_FORMAT_STRING, ids[i].name);
break;
}
}
if (ids[i].id == 0x0) {
dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
ab->chip_id);
dev_err(&client->dev, "driver not started!\n");
goto exit_no_detect;
}
dev_info(&client->dev, "detected AB chip: %s\n", &ab->chip_name[0]);
/* Attach other dummy I2C clients. */
while (++num_i2c_clients < AB3550_NUM_BANKS) {
ab->i2c_client[num_i2c_clients] =
i2c_new_dummy(client->adapter,
(client->addr + num_i2c_clients));
if (!ab->i2c_client[num_i2c_clients]) {
err = -ENOMEM;
goto exit_no_dummy_client;
}
strlcpy(ab->i2c_client[num_i2c_clients]->name, id->name,
sizeof(ab->i2c_client[num_i2c_clients]->name));
}
err = ab3550_setup(ab);
if (err)
goto exit_no_setup;
INIT_WORK(&ab->mask_work, ab3550_mask_work);
for (i = 0; i < ab3550_plf_data->irq.count; i++) {
unsigned int irq;
irq = ab3550_plf_data->irq.base + i;
set_irq_chip_data(irq, ab);
set_irq_chip_and_handler(irq, &ab3550_irq_chip,
handle_simple_irq);
set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
set_irq_noprobe(irq);
#endif
}
err = request_threaded_irq(client->irq, NULL, ab3550_irq_handler,
IRQF_ONESHOT, "ab3550-core", ab);
/* This real unpredictable IRQ is of course sampled for entropy */
rand_initialize_irq(client->irq);
if (err)
goto exit_no_irq;
err = abx500_register_ops(&client->dev, &ab3550_ops);
if (err)
goto exit_no_ops;
/* Set up and register the platform devices. */
for (i = 0; i < AB3550_NUM_DEVICES; i++) {
ab3550_devs[i].platform_data = ab3550_plf_data->dev_data[i];
ab3550_devs[i].data_size = ab3550_plf_data->dev_data_sz[i];
}
err = mfd_add_devices(&client->dev, 0, ab3550_devs,
ARRAY_SIZE(ab3550_devs), NULL,
ab3550_plf_data->irq.base);
ab3550_setup_debugfs(ab);
return 0;
exit_no_ops:
exit_no_irq:
exit_no_setup:
exit_no_dummy_client:
/* Unregister the dummy i2c clients. */
while (--num_i2c_clients)
i2c_unregister_device(ab->i2c_client[num_i2c_clients]);
exit_no_detect:
kfree(ab);
return err;
}
static int __exit ab3550_remove(struct i2c_client *client)
{
struct ab3550 *ab = i2c_get_clientdata(client);
int num_i2c_clients = AB3550_NUM_BANKS;
mfd_remove_devices(&client->dev);
ab3550_remove_debugfs();
while (--num_i2c_clients)
i2c_unregister_device(ab->i2c_client[num_i2c_clients]);
/*
* At this point, all subscribers should have unregistered
* their notifiers so deactivate IRQ
*/
free_irq(client->irq, ab);
kfree(ab);
return 0;
}
static const struct i2c_device_id ab3550_id[] = {
{AB3550_NAME_STRING, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, ab3550_id);
static struct i2c_driver ab3550_driver = {
.driver = {
.name = AB3550_NAME_STRING,
.owner = THIS_MODULE,
},
.id_table = ab3550_id,
.probe = ab3550_probe,
.remove = __exit_p(ab3550_remove),
};
static int __init ab3550_i2c_init(void)
{
return i2c_add_driver(&ab3550_driver);
}
static void __exit ab3550_i2c_exit(void)
{
i2c_del_driver(&ab3550_driver);
}
subsys_initcall(ab3550_i2c_init);
module_exit(ab3550_i2c_exit);
MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
MODULE_DESCRIPTION("AB3550 core driver");
MODULE_LICENSE("GPL");
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