678 lines
16 KiB
C
678 lines
16 KiB
C
|
/* Copyright (c) 2010, The Linux Foundation. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 and
|
||
|
|
* only version 2 as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*/
|
||
|
|
#include <linux/gpio.h>
|
||
|
|
#include <linux/i2c.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/workqueue.h>
|
||
|
|
#include <linux/i2c/sx150x.h>
|
||
|
|
|
||
|
|
#define NO_UPDATE_PENDING -1
|
||
|
|
|
||
|
|
struct sx150x_device_data {
|
||
|
|
u8 reg_pullup;
|
||
|
|
u8 reg_pulldn;
|
||
|
|
u8 reg_drain;
|
||
|
|
u8 reg_polarity;
|
||
|
|
u8 reg_dir;
|
||
|
|
u8 reg_data;
|
||
|
|
u8 reg_irq_mask;
|
||
|
|
u8 reg_irq_src;
|
||
|
|
u8 reg_sense;
|
||
|
|
u8 reg_clock;
|
||
|
|
u8 reg_misc;
|
||
|
|
u8 reg_reset;
|
||
|
|
u8 ngpios;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct sx150x_chip {
|
||
|
|
struct gpio_chip gpio_chip;
|
||
|
|
struct i2c_client *client;
|
||
|
|
const struct sx150x_device_data *dev_cfg;
|
||
|
|
int irq_summary;
|
||
|
|
int irq_base;
|
||
|
|
int irq_update;
|
||
|
|
u32 irq_sense;
|
||
|
|
u32 irq_masked;
|
||
|
|
u32 dev_sense;
|
||
|
|
u32 dev_masked;
|
||
|
|
struct irq_chip irq_chip;
|
||
|
|
struct mutex lock;
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct sx150x_device_data sx150x_devices[] = {
|
||
|
|
[0] = { /* sx1508q */
|
||
|
|
.reg_pullup = 0x03,
|
||
|
|
.reg_pulldn = 0x04,
|
||
|
|
.reg_drain = 0x05,
|
||
|
|
.reg_polarity = 0x06,
|
||
|
|
.reg_dir = 0x07,
|
||
|
|
.reg_data = 0x08,
|
||
|
|
.reg_irq_mask = 0x09,
|
||
|
|
.reg_irq_src = 0x0c,
|
||
|
|
.reg_sense = 0x0b,
|
||
|
|
.reg_clock = 0x0f,
|
||
|
|
.reg_misc = 0x10,
|
||
|
|
.reg_reset = 0x7d,
|
||
|
|
.ngpios = 8
|
||
|
|
},
|
||
|
|
[1] = { /* sx1509q */
|
||
|
|
.reg_pullup = 0x07,
|
||
|
|
.reg_pulldn = 0x09,
|
||
|
|
.reg_drain = 0x0b,
|
||
|
|
.reg_polarity = 0x0d,
|
||
|
|
.reg_dir = 0x0f,
|
||
|
|
.reg_data = 0x11,
|
||
|
|
.reg_irq_mask = 0x13,
|
||
|
|
.reg_irq_src = 0x19,
|
||
|
|
.reg_sense = 0x17,
|
||
|
|
.reg_clock = 0x1e,
|
||
|
|
.reg_misc = 0x1f,
|
||
|
|
.reg_reset = 0x7d,
|
||
|
|
.ngpios = 16
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct i2c_device_id sx150x_id[] = {
|
||
|
|
{"sx1508q", 0},
|
||
|
|
{"sx1509q", 1},
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, sx150x_id);
|
||
|
|
|
||
|
|
static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
|
||
|
|
{
|
||
|
|
s32 err = i2c_smbus_write_byte_data(client, reg, val);
|
||
|
|
|
||
|
|
if (err < 0)
|
||
|
|
dev_warn(&client->dev,
|
||
|
|
"i2c write fail: can't write %02x to %02x: %d\n",
|
||
|
|
val, reg, err);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static s32 sx150x_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
|
||
|
|
{
|
||
|
|
s32 err = i2c_smbus_read_byte_data(client, reg);
|
||
|
|
|
||
|
|
if (err >= 0)
|
||
|
|
*val = err;
|
||
|
|
else
|
||
|
|
dev_warn(&client->dev,
|
||
|
|
"i2c read fail: can't read from %02x: %d\n",
|
||
|
|
reg, err);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool offset_is_oscio(struct sx150x_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
return (chip->dev_cfg->ngpios == offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* These utility functions solve the common problem of locating and setting
|
||
|
|
* configuration bits. Configuration bits are grouped into registers
|
||
|
|
* whose indexes increase downwards. For example, with eight-bit registers,
|
||
|
|
* sixteen gpios would have their config bits grouped in the following order:
|
||
|
|
* REGISTER N-1 [ f e d c b a 9 8 ]
|
||
|
|
* N [ 7 6 5 4 3 2 1 0 ]
|
||
|
|
*
|
||
|
|
* For multi-bit configurations, the pattern gets wider:
|
||
|
|
* REGISTER N-3 [ f f e e d d c c ]
|
||
|
|
* N-2 [ b b a a 9 9 8 8 ]
|
||
|
|
* N-1 [ 7 7 6 6 5 5 4 4 ]
|
||
|
|
* N [ 3 3 2 2 1 1 0 0 ]
|
||
|
|
*
|
||
|
|
* Given the address of the starting register 'N', the index of the gpio
|
||
|
|
* whose configuration we seek to change, and the width in bits of that
|
||
|
|
* configuration, these functions allow us to locate the correct
|
||
|
|
* register and mask the correct bits.
|
||
|
|
*/
|
||
|
|
static inline void sx150x_find_cfg(u8 offset, u8 width,
|
||
|
|
u8 *reg, u8 *mask, u8 *shift)
|
||
|
|
{
|
||
|
|
*reg -= offset * width / 8;
|
||
|
|
*mask = (1 << width) - 1;
|
||
|
|
*shift = (offset * width) % 8;
|
||
|
|
*mask <<= *shift;
|
||
|
|
}
|
||
|
|
|
||
|
|
static s32 sx150x_write_cfg(struct sx150x_chip *chip,
|
||
|
|
u8 offset, u8 width, u8 reg, u8 val)
|
||
|
|
{
|
||
|
|
u8 mask;
|
||
|
|
u8 data;
|
||
|
|
u8 shift;
|
||
|
|
s32 err;
|
||
|
|
|
||
|
|
sx150x_find_cfg(offset, width, ®, &mask, &shift);
|
||
|
|
err = sx150x_i2c_read(chip->client, reg, &data);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
data &= ~mask;
|
||
|
|
data |= (val << shift) & mask;
|
||
|
|
return sx150x_i2c_write(chip->client, reg, data);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_get_io(struct sx150x_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
u8 reg = chip->dev_cfg->reg_data;
|
||
|
|
u8 mask;
|
||
|
|
u8 data;
|
||
|
|
u8 shift;
|
||
|
|
s32 err;
|
||
|
|
|
||
|
|
sx150x_find_cfg(offset, 1, ®, &mask, &shift);
|
||
|
|
err = sx150x_i2c_read(chip->client, reg, &data);
|
||
|
|
if (err >= 0)
|
||
|
|
err = (data & mask) != 0 ? 1 : 0;
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static s32 sx150x_set_oscio(struct sx150x_chip *chip, int val)
|
||
|
|
{
|
||
|
|
return sx150x_i2c_write(chip->client,
|
||
|
|
chip->dev_cfg->reg_clock,
|
||
|
|
(val ? 0x1f : 0x10));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_set_io(struct sx150x_chip *chip, unsigned offset, int val)
|
||
|
|
{
|
||
|
|
sx150x_write_cfg(chip,
|
||
|
|
offset,
|
||
|
|
1,
|
||
|
|
chip->dev_cfg->reg_data,
|
||
|
|
(val ? 1 : 0));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_io_input(struct sx150x_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
return sx150x_write_cfg(chip,
|
||
|
|
offset,
|
||
|
|
1,
|
||
|
|
chip->dev_cfg->reg_dir,
|
||
|
|
1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = sx150x_write_cfg(chip,
|
||
|
|
offset,
|
||
|
|
1,
|
||
|
|
chip->dev_cfg->reg_data,
|
||
|
|
(val ? 1 : 0));
|
||
|
|
if (err >= 0)
|
||
|
|
err = sx150x_write_cfg(chip,
|
||
|
|
offset,
|
||
|
|
1,
|
||
|
|
chip->dev_cfg->reg_dir,
|
||
|
|
0);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
int status = -EINVAL;
|
||
|
|
|
||
|
|
chip = container_of(gc, struct sx150x_chip, gpio_chip);
|
||
|
|
|
||
|
|
if (!offset_is_oscio(chip, offset)) {
|
||
|
|
mutex_lock(&chip->lock);
|
||
|
|
status = sx150x_get_io(chip, offset);
|
||
|
|
mutex_unlock(&chip->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
|
||
|
|
chip = container_of(gc, struct sx150x_chip, gpio_chip);
|
||
|
|
|
||
|
|
mutex_lock(&chip->lock);
|
||
|
|
if (offset_is_oscio(chip, offset))
|
||
|
|
sx150x_set_oscio(chip, val);
|
||
|
|
else
|
||
|
|
sx150x_set_io(chip, offset, val);
|
||
|
|
mutex_unlock(&chip->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
int status = -EINVAL;
|
||
|
|
|
||
|
|
chip = container_of(gc, struct sx150x_chip, gpio_chip);
|
||
|
|
|
||
|
|
if (!offset_is_oscio(chip, offset)) {
|
||
|
|
mutex_lock(&chip->lock);
|
||
|
|
status = sx150x_io_input(chip, offset);
|
||
|
|
mutex_unlock(&chip->lock);
|
||
|
|
}
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_gpio_direction_output(struct gpio_chip *gc,
|
||
|
|
unsigned offset,
|
||
|
|
int val)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
int status = 0;
|
||
|
|
|
||
|
|
chip = container_of(gc, struct sx150x_chip, gpio_chip);
|
||
|
|
|
||
|
|
mutex_lock(&chip->lock);
|
||
|
|
if (offset_is_oscio(chip, offset))
|
||
|
|
status = sx150x_set_oscio(chip, val);
|
||
|
|
else
|
||
|
|
status = sx150x_io_output(chip, offset, val);
|
||
|
|
mutex_unlock(&chip->lock);
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
|
||
|
|
chip = container_of(gc, struct sx150x_chip, gpio_chip);
|
||
|
|
|
||
|
|
if (offset >= chip->dev_cfg->ngpios)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (chip->irq_base < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return chip->irq_base + offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_irq_mask(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
unsigned n;
|
||
|
|
|
||
|
|
chip = container_of(ic, struct sx150x_chip, irq_chip);
|
||
|
|
n = d->irq - chip->irq_base;
|
||
|
|
chip->irq_masked |= (1 << n);
|
||
|
|
chip->irq_update = n;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_irq_unmask(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
unsigned n;
|
||
|
|
|
||
|
|
chip = container_of(ic, struct sx150x_chip, irq_chip);
|
||
|
|
n = d->irq - chip->irq_base;
|
||
|
|
|
||
|
|
chip->irq_masked &= ~(1 << n);
|
||
|
|
chip->irq_update = n;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
|
||
|
|
{
|
||
|
|
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
unsigned n, val = 0;
|
||
|
|
|
||
|
|
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
chip = container_of(ic, struct sx150x_chip, irq_chip);
|
||
|
|
n = d->irq - chip->irq_base;
|
||
|
|
|
||
|
|
if (flow_type & IRQ_TYPE_EDGE_RISING)
|
||
|
|
val |= 0x1;
|
||
|
|
if (flow_type & IRQ_TYPE_EDGE_FALLING)
|
||
|
|
val |= 0x2;
|
||
|
|
|
||
|
|
chip->irq_sense &= ~(3UL << (n * 2));
|
||
|
|
chip->irq_sense |= val << (n * 2);
|
||
|
|
chip->irq_update = n;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip = (struct sx150x_chip *)dev_id;
|
||
|
|
unsigned nhandled = 0;
|
||
|
|
unsigned sub_irq;
|
||
|
|
unsigned n;
|
||
|
|
s32 err;
|
||
|
|
u8 val;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = (chip->dev_cfg->ngpios / 8) - 1; i >= 0; --i) {
|
||
|
|
err = sx150x_i2c_read(chip->client,
|
||
|
|
chip->dev_cfg->reg_irq_src - i,
|
||
|
|
&val);
|
||
|
|
if (err < 0)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
sx150x_i2c_write(chip->client,
|
||
|
|
chip->dev_cfg->reg_irq_src - i,
|
||
|
|
val);
|
||
|
|
for (n = 0; n < 8; ++n) {
|
||
|
|
if (val & (1 << n)) {
|
||
|
|
sub_irq = chip->irq_base + (i * 8) + n;
|
||
|
|
handle_nested_irq(sub_irq);
|
||
|
|
++nhandled;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_irq_bus_lock(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
|
||
|
|
chip = container_of(ic, struct sx150x_chip, irq_chip);
|
||
|
|
|
||
|
|
mutex_lock(&chip->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
|
||
|
|
{
|
||
|
|
struct irq_chip *ic = irq_data_get_irq_chip(d);
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
unsigned n;
|
||
|
|
|
||
|
|
chip = container_of(ic, struct sx150x_chip, irq_chip);
|
||
|
|
|
||
|
|
if (chip->irq_update == NO_UPDATE_PENDING)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
n = chip->irq_update;
|
||
|
|
chip->irq_update = NO_UPDATE_PENDING;
|
||
|
|
|
||
|
|
/* Avoid updates if nothing changed */
|
||
|
|
if (chip->dev_sense == chip->irq_sense &&
|
||
|
|
chip->dev_sense == chip->irq_masked)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
chip->dev_sense = chip->irq_sense;
|
||
|
|
chip->dev_masked = chip->irq_masked;
|
||
|
|
|
||
|
|
if (chip->irq_masked & (1 << n)) {
|
||
|
|
sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 1);
|
||
|
|
sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense, 0);
|
||
|
|
} else {
|
||
|
|
sx150x_write_cfg(chip, n, 1, chip->dev_cfg->reg_irq_mask, 0);
|
||
|
|
sx150x_write_cfg(chip, n, 2, chip->dev_cfg->reg_sense,
|
||
|
|
chip->irq_sense >> (n * 2));
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
mutex_unlock(&chip->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_init_chip(struct sx150x_chip *chip,
|
||
|
|
struct i2c_client *client,
|
||
|
|
kernel_ulong_t driver_data,
|
||
|
|
struct sx150x_platform_data *pdata)
|
||
|
|
{
|
||
|
|
mutex_init(&chip->lock);
|
||
|
|
|
||
|
|
chip->client = client;
|
||
|
|
chip->dev_cfg = &sx150x_devices[driver_data];
|
||
|
|
chip->gpio_chip.label = client->name;
|
||
|
|
chip->gpio_chip.direction_input = sx150x_gpio_direction_input;
|
||
|
|
chip->gpio_chip.direction_output = sx150x_gpio_direction_output;
|
||
|
|
chip->gpio_chip.get = sx150x_gpio_get;
|
||
|
|
chip->gpio_chip.set = sx150x_gpio_set;
|
||
|
|
chip->gpio_chip.to_irq = sx150x_gpio_to_irq;
|
||
|
|
chip->gpio_chip.base = pdata->gpio_base;
|
||
|
|
chip->gpio_chip.can_sleep = 1;
|
||
|
|
chip->gpio_chip.ngpio = chip->dev_cfg->ngpios;
|
||
|
|
if (pdata->oscio_is_gpo)
|
||
|
|
++chip->gpio_chip.ngpio;
|
||
|
|
|
||
|
|
chip->irq_chip.name = client->name;
|
||
|
|
chip->irq_chip.irq_mask = sx150x_irq_mask;
|
||
|
|
chip->irq_chip.irq_unmask = sx150x_irq_unmask;
|
||
|
|
chip->irq_chip.irq_set_type = sx150x_irq_set_type;
|
||
|
|
chip->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
|
||
|
|
chip->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
|
||
|
|
chip->irq_summary = -1;
|
||
|
|
chip->irq_base = -1;
|
||
|
|
chip->irq_masked = ~0;
|
||
|
|
chip->irq_sense = 0;
|
||
|
|
chip->dev_masked = ~0;
|
||
|
|
chip->dev_sense = 0;
|
||
|
|
chip->irq_update = NO_UPDATE_PENDING;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_init_io(struct sx150x_chip *chip, u8 base, u16 cfg)
|
||
|
|
{
|
||
|
|
int err = 0;
|
||
|
|
unsigned n;
|
||
|
|
|
||
|
|
for (n = 0; err >= 0 && n < (chip->dev_cfg->ngpios / 8); ++n)
|
||
|
|
err = sx150x_i2c_write(chip->client, base - n, cfg >> (n * 8));
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_reset(struct sx150x_chip *chip)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = i2c_smbus_write_byte_data(chip->client,
|
||
|
|
chip->dev_cfg->reg_reset,
|
||
|
|
0x12);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = i2c_smbus_write_byte_data(chip->client,
|
||
|
|
chip->dev_cfg->reg_reset,
|
||
|
|
0x34);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_init_hw(struct sx150x_chip *chip,
|
||
|
|
struct sx150x_platform_data *pdata)
|
||
|
|
{
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
if (pdata->reset_during_probe) {
|
||
|
|
err = sx150x_reset(chip);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = sx150x_i2c_write(chip->client,
|
||
|
|
chip->dev_cfg->reg_misc,
|
||
|
|
0x01);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_pullup,
|
||
|
|
pdata->io_pullup_ena);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_pulldn,
|
||
|
|
pdata->io_pulldn_ena);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_drain,
|
||
|
|
pdata->io_open_drain_ena);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = sx150x_init_io(chip, chip->dev_cfg->reg_polarity,
|
||
|
|
pdata->io_polarity);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
if (pdata->oscio_is_gpo)
|
||
|
|
sx150x_set_oscio(chip, 0);
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sx150x_install_irq_chip(struct sx150x_chip *chip,
|
||
|
|
int irq_summary,
|
||
|
|
int irq_base)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
unsigned n;
|
||
|
|
unsigned irq;
|
||
|
|
|
||
|
|
chip->irq_summary = irq_summary;
|
||
|
|
chip->irq_base = irq_base;
|
||
|
|
|
||
|
|
for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
|
||
|
|
irq = irq_base + n;
|
||
|
|
irq_set_chip_and_handler(irq, &chip->irq_chip, handle_edge_irq);
|
||
|
|
irq_set_nested_thread(irq, 1);
|
||
|
|
#ifdef CONFIG_ARM
|
||
|
|
set_irq_flags(irq, IRQF_VALID);
|
||
|
|
#else
|
||
|
|
irq_set_noprobe(irq);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
err = request_threaded_irq(irq_summary,
|
||
|
|
NULL,
|
||
|
|
sx150x_irq_thread_fn,
|
||
|
|
IRQF_SHARED | IRQF_TRIGGER_FALLING,
|
||
|
|
chip->irq_chip.name,
|
||
|
|
chip);
|
||
|
|
if (err < 0) {
|
||
|
|
chip->irq_summary = -1;
|
||
|
|
chip->irq_base = -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sx150x_remove_irq_chip(struct sx150x_chip *chip)
|
||
|
|
{
|
||
|
|
unsigned n;
|
||
|
|
unsigned irq;
|
||
|
|
|
||
|
|
free_irq(chip->irq_summary, chip);
|
||
|
|
|
||
|
|
for (n = 0; n < chip->dev_cfg->ngpios; ++n) {
|
||
|
|
irq = chip->irq_base + n;
|
||
|
|
irq_set_chip_and_handler(irq, NULL, NULL);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __devinit sx150x_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *id)
|
||
|
|
{
|
||
|
|
static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
|
||
|
|
I2C_FUNC_SMBUS_WRITE_WORD_DATA;
|
||
|
|
struct sx150x_platform_data *pdata;
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
pdata = client->dev.platform_data;
|
||
|
|
if (!pdata)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (!i2c_check_functionality(client->adapter, i2c_funcs))
|
||
|
|
return -ENOSYS;
|
||
|
|
|
||
|
|
chip = kzalloc(sizeof(struct sx150x_chip), GFP_KERNEL);
|
||
|
|
if (!chip)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
sx150x_init_chip(chip, client, id->driver_data, pdata);
|
||
|
|
rc = sx150x_init_hw(chip, pdata);
|
||
|
|
if (rc < 0)
|
||
|
|
goto probe_fail_pre_gpiochip_add;
|
||
|
|
|
||
|
|
rc = gpiochip_add(&chip->gpio_chip);
|
||
|
|
if (rc < 0)
|
||
|
|
goto probe_fail_pre_gpiochip_add;
|
||
|
|
|
||
|
|
if (pdata->irq_summary >= 0) {
|
||
|
|
rc = sx150x_install_irq_chip(chip,
|
||
|
|
pdata->irq_summary,
|
||
|
|
pdata->irq_base);
|
||
|
|
if (rc < 0)
|
||
|
|
goto probe_fail_post_gpiochip_add;
|
||
|
|
}
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, chip);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
probe_fail_post_gpiochip_add:
|
||
|
|
WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
|
||
|
|
probe_fail_pre_gpiochip_add:
|
||
|
|
kfree(chip);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __devexit sx150x_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct sx150x_chip *chip;
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
chip = i2c_get_clientdata(client);
|
||
|
|
rc = gpiochip_remove(&chip->gpio_chip);
|
||
|
|
if (rc < 0)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
if (chip->irq_summary >= 0)
|
||
|
|
sx150x_remove_irq_chip(chip);
|
||
|
|
|
||
|
|
kfree(chip);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct i2c_driver sx150x_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "sx150x",
|
||
|
|
.owner = THIS_MODULE
|
||
|
|
},
|
||
|
|
.probe = sx150x_probe,
|
||
|
|
.remove = __devexit_p(sx150x_remove),
|
||
|
|
.id_table = sx150x_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init sx150x_init(void)
|
||
|
|
{
|
||
|
|
return i2c_add_driver(&sx150x_driver);
|
||
|
|
}
|
||
|
|
subsys_initcall(sx150x_init);
|
||
|
|
|
||
|
|
static void __exit sx150x_exit(void)
|
||
|
|
{
|
||
|
|
return i2c_del_driver(&sx150x_driver);
|
||
|
|
}
|
||
|
|
module_exit(sx150x_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Gregory Bean <gbean@codeaurora.org>");
|
||
|
|
MODULE_DESCRIPTION("Driver for Semtech SX150X I2C GPIO Expanders");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_ALIAS("i2c:sx150x");
|