kernel-ark/drivers/mfd/ab3550-core.c
Wolfram Sang fbae3fb154 i2c: Remove all i2c_set_clientdata(client, NULL) in drivers
I2C drivers can use the clientdata-pointer to point to private data. As I2C
devices are not really unregistered, but merely detached from their driver, it
used to be the drivers obligation to clear this pointer during remove() or a
failed probe(). As a couple of drivers forgot to do this, it was agreed that it
was cleaner if the i2c-core does this clearance when appropriate, as there is
no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
This feature was added to the core with commit
e4a7b9b04d to fix the faulty drivers.

As there is no need anymore to clear the clientdata-pointer, remove all current
occurrences in the drivers to simplify the code and prevent confusion.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
2010-06-03 11:33:58 +02:00

1401 lines
30 KiB
C

/*
* 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 exported register access functionality.
*/
int ab3550_get_chip_id(struct device *dev)
{
struct ab3550 *ab = dev_get_drvdata(dev->parent);
return (int)ab->chip_id;
}
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);
}
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);
}
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);
}
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);
}
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;
}
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(unsigned int irq)
{
unsigned long flags;
struct ab3550 *ab;
struct ab3550_platform_data *plf_data;
ab = get_irq_chip_data(irq);
plf_data = ab->i2c_client[0]->dev.platform_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(unsigned int irq)
{
unsigned long flags;
struct ab3550 *ab;
struct ab3550_platform_data *plf_data;
ab = get_irq_chip_data(irq);
plf_data = ab->i2c_client[0]->dev.platform_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(unsigned int irq)
{
}
static struct irq_chip ab3550_irq_chip = {
.name = "ab3550-core", /* Keep the same name as the request */
.startup = NULL, /* defaults to enable */
.shutdown = NULL, /* defaults to disable */
.enable = NULL, /* defaults to unmask */
.disable = ab3550_mask, /* No default to mask in chip.c */
.ack = noop,
.mask = ab3550_mask,
.unmask = ab3550_unmask,
.end = NULL,
};
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");