blob: 377510facf93298fd354f55a0db85f04cc41d0f1 [file] [log] [blame]
/*
* Qualcomm PMIC8XXX GPIO driver
*
* Copyright (c) 2011, Code Aurora Forum. 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/mfd/pm8xxx/core.h>
#include <linux/mfd/pm8xxx/gpio.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
/* GPIO registers */
#define SSBI_REG_ADDR_GPIO_BASE 0x150
#define SSBI_REG_ADDR_GPIO(n) (SSBI_REG_ADDR_GPIO_BASE + n)
/* GPIO */
#define PM_GPIO_BANK_MASK 0x70
#define PM_GPIO_BANK_SHIFT 4
#define PM_GPIO_WRITE 0x80
/* Bank 0 */
#define PM_GPIO_VIN_MASK 0x0E
#define PM_GPIO_VIN_SHIFT 1
#define PM_GPIO_MODE_ENABLE 0x01
/* Bank 1 */
#define PM_GPIO_MODE_MASK 0x0C
#define PM_GPIO_MODE_SHIFT 2
#define PM_GPIO_OUT_BUFFER 0x02
#define PM_GPIO_OUT_INVERT 0x01
#define PM_GPIO_MODE_OFF 3
#define PM_GPIO_MODE_OUTPUT 2
#define PM_GPIO_MODE_INPUT 0
#define PM_GPIO_MODE_BOTH 1
/* Bank 2 */
#define PM_GPIO_PULL_MASK 0x0E
#define PM_GPIO_PULL_SHIFT 1
/* Bank 3 */
#define PM_GPIO_OUT_STRENGTH_MASK 0x0C
#define PM_GPIO_OUT_STRENGTH_SHIFT 2
#define PM_GPIO_PIN_ENABLE 0x00
#define PM_GPIO_PIN_DISABLE 0x01
/* Bank 4 */
#define PM_GPIO_FUNC_MASK 0x0E
#define PM_GPIO_FUNC_SHIFT 1
/* Bank 5 */
#define PM_GPIO_NON_INT_POL_INV 0x08
#define PM_GPIO_BANKS 6
struct pm_gpio_chip {
struct list_head link;
struct gpio_chip gpio_chip;
spinlock_t pm_lock;
u8 *bank1;
int irq_base;
};
static LIST_HEAD(pm_gpio_chips);
static DEFINE_MUTEX(pm_gpio_chips_lock);
static int pm_gpio_get(struct pm_gpio_chip *pm_gpio_chip, unsigned gpio)
{
int mode;
if (gpio >= pm_gpio_chip->gpio_chip.ngpio || pm_gpio_chip == NULL)
return -EINVAL;
/* Get gpio value from config bank 1 if output gpio.
Get gpio value from IRQ RT status register for all other gpio modes.
*/
mode = (pm_gpio_chip->bank1[gpio] & PM_GPIO_MODE_MASK) >>
PM_GPIO_MODE_SHIFT;
if (mode == PM_GPIO_MODE_OUTPUT)
return pm_gpio_chip->bank1[gpio] & PM_GPIO_OUT_INVERT;
else
return pm8xxx_read_irq_stat(pm_gpio_chip->gpio_chip.dev->parent,
pm_gpio_chip->irq_base + gpio);
}
static int pm_gpio_set(struct pm_gpio_chip *pm_gpio_chip,
unsigned gpio, int value)
{
int rc;
u8 bank1;
unsigned long flags;
if (gpio >= pm_gpio_chip->gpio_chip.ngpio || pm_gpio_chip == NULL)
return -EINVAL;
spin_lock_irqsave(&pm_gpio_chip->pm_lock, flags);
bank1 = PM_GPIO_WRITE
| (pm_gpio_chip->bank1[gpio] & ~PM_GPIO_OUT_INVERT);
if (value)
bank1 |= PM_GPIO_OUT_INVERT;
pm_gpio_chip->bank1[gpio] = bank1;
rc = pm8xxx_writeb(pm_gpio_chip->gpio_chip.dev->parent,
SSBI_REG_ADDR_GPIO(gpio), bank1);
spin_unlock_irqrestore(&pm_gpio_chip->pm_lock, flags);
if (rc)
pr_err("FAIL pm8xxx_writeb(): rc=%d. "
"(gpio=%d, value=%d)\n",
rc, gpio, value);
return rc;
}
static int dir_map[] = {
PM_GPIO_MODE_OFF,
PM_GPIO_MODE_OUTPUT,
PM_GPIO_MODE_INPUT,
PM_GPIO_MODE_BOTH,
};
static int pm_gpio_set_direction(struct pm_gpio_chip *pm_gpio_chip,
unsigned gpio, int direction)
{
int rc;
u8 bank1;
unsigned long flags;
if (!direction || pm_gpio_chip == NULL)
return -EINVAL;
spin_lock_irqsave(&pm_gpio_chip->pm_lock, flags);
bank1 = PM_GPIO_WRITE
| (pm_gpio_chip->bank1[gpio] & ~PM_GPIO_MODE_MASK);
bank1 |= ((dir_map[direction] << PM_GPIO_MODE_SHIFT)
& PM_GPIO_MODE_MASK);
pm_gpio_chip->bank1[gpio] = bank1;
rc = pm8xxx_writeb(pm_gpio_chip->gpio_chip.dev->parent,
SSBI_REG_ADDR_GPIO(gpio), bank1);
spin_unlock_irqrestore(&pm_gpio_chip->pm_lock, flags);
if (rc)
pr_err("Failed on pm8xxx_writeb(): rc=%d (GPIO config)\n",
rc);
return rc;
}
static int pm_gpio_init_bank1(struct pm_gpio_chip *pm_gpio_chip)
{
int i, rc;
u8 bank;
for (i = 0; i < pm_gpio_chip->gpio_chip.ngpio; i++) {
bank = 1 << PM_GPIO_BANK_SHIFT;
rc = pm8xxx_writeb(pm_gpio_chip->gpio_chip.dev->parent,
SSBI_REG_ADDR_GPIO(i),
bank);
if (rc) {
pr_err("error setting bank rc=%d\n", rc);
return rc;
}
rc = pm8xxx_readb(pm_gpio_chip->gpio_chip.dev->parent,
SSBI_REG_ADDR_GPIO(i),
&pm_gpio_chip->bank1[i]);
if (rc) {
pr_err("error reading bank 1 rc=%d\n", rc);
return rc;
}
}
return 0;
}
static int pm_gpio_to_irq(struct gpio_chip *gpio_chip, unsigned offset)
{
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
return pm_gpio_chip->irq_base + offset;
}
static int pm_gpio_read(struct gpio_chip *gpio_chip, unsigned offset)
{
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
return pm_gpio_get(pm_gpio_chip, offset);
}
static void pm_gpio_write(struct gpio_chip *gpio_chip,
unsigned offset, int val)
{
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
pm_gpio_set(pm_gpio_chip, offset, val);
}
static int pm_gpio_direction_input(struct gpio_chip *gpio_chip,
unsigned offset)
{
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
return pm_gpio_set_direction(pm_gpio_chip, offset, PM_GPIO_DIR_IN);
}
static int pm_gpio_direction_output(struct gpio_chip *gpio_chip,
unsigned offset,
int val)
{
int ret;
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
ret = pm_gpio_set_direction(pm_gpio_chip, offset, PM_GPIO_DIR_OUT);
if (!ret)
ret = pm_gpio_set(pm_gpio_chip, offset, val);
return ret;
}
static void pm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gpio_chip)
{
static const char * const cmode[] = { "in", "in/out", "out", "off" };
struct pm_gpio_chip *pm_gpio_chip = dev_get_drvdata(gpio_chip->dev);
u8 mode, state, bank;
const char *label;
int i, j;
for (i = 0; i < gpio_chip->ngpio; i++) {
label = gpiochip_is_requested(gpio_chip, i);
mode = (pm_gpio_chip->bank1[i] & PM_GPIO_MODE_MASK) >>
PM_GPIO_MODE_SHIFT;
state = pm_gpio_get(pm_gpio_chip, i);
seq_printf(s, "gpio-%-3d (%-12.12s) %-10.10s"
" %s",
gpio_chip->base + i,
label ? label : "--",
cmode[mode],
state ? "hi" : "lo");
for (j = 0; j < PM_GPIO_BANKS; j++) {
bank = j << PM_GPIO_BANK_SHIFT;
pm8xxx_writeb(gpio_chip->dev->parent,
SSBI_REG_ADDR_GPIO(i),
bank);
pm8xxx_readb(gpio_chip->dev->parent,
SSBI_REG_ADDR_GPIO(i),
&bank);
seq_printf(s, " 0x%02x", bank);
}
seq_printf(s, "\n");
}
}
static int __devinit pm_gpio_probe(struct platform_device *pdev)
{
int ret;
const struct pm8xxx_gpio_platform_data *pdata = pdev->dev.platform_data;
struct pm_gpio_chip *pm_gpio_chip;
if (!pdata) {
pr_err("missing platform data\n");
return -EINVAL;
}
pm_gpio_chip = kzalloc(sizeof(struct pm_gpio_chip), GFP_KERNEL);
if (!pm_gpio_chip) {
pr_err("Cannot allocate pm_gpio_chip\n");
return -ENOMEM;
}
pm_gpio_chip->bank1 = kzalloc(sizeof(u8) * pdata->gpio_cdata.ngpios,
GFP_KERNEL);
if (!pm_gpio_chip->bank1) {
pr_err("Cannot allocate pm_gpio_chip->bank1\n");
ret = -ENOMEM;
goto free_chip;
}
spin_lock_init(&pm_gpio_chip->pm_lock);
pm_gpio_chip->gpio_chip.label = "pm-gpio";
pm_gpio_chip->gpio_chip.direction_input = pm_gpio_direction_input;
pm_gpio_chip->gpio_chip.direction_output = pm_gpio_direction_output;
pm_gpio_chip->gpio_chip.to_irq = pm_gpio_to_irq;
pm_gpio_chip->gpio_chip.get = pm_gpio_read;
pm_gpio_chip->gpio_chip.set = pm_gpio_write;
pm_gpio_chip->gpio_chip.dbg_show = pm_gpio_dbg_show;
pm_gpio_chip->gpio_chip.ngpio = pdata->gpio_cdata.ngpios;
pm_gpio_chip->gpio_chip.can_sleep = 1;
pm_gpio_chip->gpio_chip.dev = &pdev->dev;
pm_gpio_chip->gpio_chip.base = pdata->gpio_base;
pm_gpio_chip->irq_base = platform_get_irq(pdev, 0);
mutex_lock(&pm_gpio_chips_lock);
list_add(&pm_gpio_chip->link, &pm_gpio_chips);
mutex_unlock(&pm_gpio_chips_lock);
platform_set_drvdata(pdev, pm_gpio_chip);
ret = gpiochip_add(&pm_gpio_chip->gpio_chip);
if (ret) {
pr_err("gpiochip_add failed ret = %d\n", ret);
goto reset_drvdata;
}
ret = pm_gpio_init_bank1(pm_gpio_chip);
if (ret) {
pr_err("gpio init bank failed ret = %d\n", ret);
goto remove_chip;
}
pr_info("OK: base=%d, ngpio=%d\n", pm_gpio_chip->gpio_chip.base,
pm_gpio_chip->gpio_chip.ngpio);
return 0;
remove_chip:
if (gpiochip_remove(&pm_gpio_chip->gpio_chip))
pr_err("failed to remove gpio chip\n");
reset_drvdata:
platform_set_drvdata(pdev, NULL);
kfree(pm_gpio_chip->bank1);
free_chip:
kfree(pm_gpio_chip);
return ret;
}
static int __devexit pm_gpio_remove(struct platform_device *pdev)
{
struct pm_gpio_chip *pm_gpio_chip
= platform_get_drvdata(pdev);
mutex_lock(&pm_gpio_chips_lock);
list_del(&pm_gpio_chip->link);
mutex_unlock(&pm_gpio_chips_lock);
platform_set_drvdata(pdev, NULL);
if (gpiochip_remove(&pm_gpio_chip->gpio_chip))
pr_err("failed to remove gpio chip\n");
kfree(pm_gpio_chip->bank1);
kfree(pm_gpio_chip);
return 0;
}
int pm8xxx_gpio_config(int gpio, struct pm_gpio *param)
{
int rc, pm_gpio = -EINVAL;
u8 bank[8];
unsigned long flags;
struct pm_gpio_chip *pm_gpio_chip;
struct gpio_chip *gpio_chip;
if (param == NULL)
return -EINVAL;
mutex_lock(&pm_gpio_chips_lock);
list_for_each_entry(pm_gpio_chip, &pm_gpio_chips, link) {
gpio_chip = &pm_gpio_chip->gpio_chip;
if (gpio >= gpio_chip->base
&& gpio < gpio_chip->base + gpio_chip->ngpio) {
pm_gpio = gpio - gpio_chip->base;
break;
}
}
mutex_unlock(&pm_gpio_chips_lock);
if (pm_gpio < 0) {
pr_err("called on gpio %d not handled by any pmic\n", gpio);
return -EINVAL;
}
/* Select banks and configure the gpio */
bank[0] = PM_GPIO_WRITE |
((param->vin_sel << PM_GPIO_VIN_SHIFT) &
PM_GPIO_VIN_MASK) |
PM_GPIO_MODE_ENABLE;
bank[1] = PM_GPIO_WRITE |
((1 << PM_GPIO_BANK_SHIFT) &
PM_GPIO_BANK_MASK) |
((dir_map[param->direction] <<
PM_GPIO_MODE_SHIFT) &
PM_GPIO_MODE_MASK) |
((param->direction & PM_GPIO_DIR_OUT) ?
((param->output_buffer & 1) ?
PM_GPIO_OUT_BUFFER : 0) : 0) |
((param->direction & PM_GPIO_DIR_OUT) ?
param->output_value & 0x01 : 0);
bank[2] = PM_GPIO_WRITE |
((2 << PM_GPIO_BANK_SHIFT) &
PM_GPIO_BANK_MASK) |
((param->pull << PM_GPIO_PULL_SHIFT) &
PM_GPIO_PULL_MASK);
bank[3] = PM_GPIO_WRITE |
((3 << PM_GPIO_BANK_SHIFT) &
PM_GPIO_BANK_MASK) |
((param->out_strength <<
PM_GPIO_OUT_STRENGTH_SHIFT) &
PM_GPIO_OUT_STRENGTH_MASK) |
(param->disable_pin ?
PM_GPIO_PIN_DISABLE : PM_GPIO_PIN_ENABLE);
bank[4] = PM_GPIO_WRITE |
((4 << PM_GPIO_BANK_SHIFT) &
PM_GPIO_BANK_MASK) |
((param->function << PM_GPIO_FUNC_SHIFT) &
PM_GPIO_FUNC_MASK);
bank[5] = PM_GPIO_WRITE |
((5 << PM_GPIO_BANK_SHIFT) & PM_GPIO_BANK_MASK) |
(param->inv_int_pol ? 0 : PM_GPIO_NON_INT_POL_INV);
spin_lock_irqsave(&pm_gpio_chip->pm_lock, flags);
/* Remember bank1 for later use */
pm_gpio_chip->bank1[pm_gpio] = bank[1];
rc = pm8xxx_write_buf(pm_gpio_chip->gpio_chip.dev->parent,
SSBI_REG_ADDR_GPIO(pm_gpio), bank, 6);
spin_unlock_irqrestore(&pm_gpio_chip->pm_lock, flags);
if (rc)
pr_err("Failed on pm8xxx_write_buf() rc=%d (GPIO config)\n",
rc);
return rc;
}
EXPORT_SYMBOL_GPL(pm8xxx_gpio_config);
static struct platform_driver pm_gpio_driver = {
.probe = pm_gpio_probe,
.remove = __devexit_p(pm_gpio_remove),
.driver = {
.name = PM8XXX_GPIO_DEV_NAME,
.owner = THIS_MODULE,
},
};
static int __init pm_gpio_init(void)
{
return platform_driver_register(&pm_gpio_driver);
}
postcore_initcall(pm_gpio_init);
static void __exit pm_gpio_exit(void)
{
platform_driver_unregister(&pm_gpio_driver);
}
module_exit(pm_gpio_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC GPIO driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:" PM8XXX_GPIO_DEV_NAME);