[Qualcomm PM8921 MFD v2 3/6] gpio: pm8xxx-gpio: Add pm8xxx gpio driver
Grant Likely
grant.likely at secretlab.ca
Sat Mar 12 04:36:45 EST 2011
On Mon, Mar 07, 2011 at 10:09:47PM -0800, adharmap at codeaurora.org wrote:
> From: Abhijeet Dharmapurikar <adharmap at codeaurora.org>
>
> Add support for GPIO on Qualcomm PM8xxx PMIC chips.
>
>
> Signed-off-by: Abhijeet Dharmapurikar <adharmap at codeaurora.org>
> ---
Hi Abhijeet,
comments below, but mostly looks good to me.
g.
> drivers/gpio/Kconfig | 10 +
> drivers/gpio/Makefile | 1 +
> drivers/gpio/pm8xxx-gpio.c | 451 +++++++++++++++++++++++++++++++++++++++
> drivers/mfd/pm8921-core.c | 34 +++
> include/linux/mfd/pm8921.h | 11 +
> include/linux/mfd/pm8xxx/gpio.h | 132 ++++++++++++
> 6 files changed, 639 insertions(+), 0 deletions(-)
> create mode 100644 drivers/gpio/pm8xxx-gpio.c
> create mode 100644 include/linux/mfd/pm8xxx/gpio.h
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 664660e..c5e6f51 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -411,4 +411,14 @@ config GPIO_JANZ_TTL
> This driver provides support for driving the pins in output
> mode only. Input mode is not supported.
>
> +comment "SSBI GPIO expanders:"
SSBI? Also, the comment seems rather out of place when there
currently appears to only be one of such devices.
> +
> +config GPIO_PM8XXX
> + tristate "Qualcomm PM8xxx GPIO support"
> + depends on MFD_PM8XXX
> + default y if MFD_PM8XXX
> + help
> + This option enables support for on-chip GPIO found on Qualcomm PM8xxx
> + PMICs.
> +
> endif
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 3351cf8..10efe6c 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -42,3 +42,4 @@ obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o
> obj-$(CONFIG_GPIO_SX150X) += sx150x.o
> obj-$(CONFIG_GPIO_VX855) += vx855_gpio.o
> obj-$(CONFIG_GPIO_ML_IOH) += ml_ioh_gpio.o
> +obj-$(CONFIG_GPIO_PM8XXX) += pm8xxx-gpio.o
> diff --git a/drivers/gpio/pm8xxx-gpio.c b/drivers/gpio/pm8xxx-gpio.c
> new file mode 100644
> index 0000000..d9c246b
> --- /dev/null
> +++ b/drivers/gpio/pm8xxx-gpio.c
> @@ -0,0 +1,451 @@
> +/* 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.
> + */
> +
> +/*
> + * Qualcomm PMIC8XXX GPIO driver
> + *
> + */
> +
> +#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>
> +
> +/* 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
> +
> +/* 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;
> + struct mutex pm_lock;
> + u8 *bank1;
> + int irq_base;
> +};
> +
> +static LIST_HEAD(pm_gpio_chips);
Looks like you need a mutex for protecting this list from mutual access.
> +
> +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;
> +
> + if (gpio >= pm_gpio_chip->gpio_chip.ngpio || pm_gpio_chip == NULL)
> + return -EINVAL;
> +
> + mutex_lock(&pm_gpio_chip->pm_lock);
> + 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);
> + mutex_unlock(&pm_gpio_chip->pm_lock);
> +
> + 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;
> +
> + if (!direction || pm_gpio_chip == NULL)
> + return -EINVAL;
> +
> + mutex_lock(&pm_gpio_chip->pm_lock);
> + 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);
> + mutex_unlock(&pm_gpio_chip->pm_lock);
> +
> + 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");
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + pm_gpio_chip = kzalloc(sizeof(struct pm_gpio_chip), GFP_KERNEL);
> + if (!pm_gpio_chip) {
> + pr_err("Cannot allocate pm_gpio_chip\n");
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + 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 out;
> + }
> +
> + mutex_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);
> + list_add(&pm_gpio_chip->link, &pm_gpio_chips);
> + 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;
> + }
> +
> + 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);
> + mutex_destroy(&pm_gpio_chip->pm_lock);
> + kfree(pm_gpio_chip);
> +out:
> + return ret;
> +}
> +
> +static int __devexit pm_gpio_remove(struct platform_device *pdev)
> +{
> + struct pm_gpio_chip *pm_gpio_chip
> + = platform_get_drvdata(pdev);
> +
> + platform_set_drvdata(pdev, NULL);
> + if (gpiochip_remove(&pm_gpio_chip->gpio_chip))
> + pr_err("failed to remove gpio chip\n");
> + mutex_destroy(&pm_gpio_chip->pm_lock);
> + kfree(pm_gpio_chip->bank1);
> + kfree(pm_gpio_chip);
> + return 0;
> +}
> +
> +int pm8xxx_gpio_config(int gpio, struct pm_gpio *param)
> +{
> + int rc;
> + u8 bank[8];
> + struct pm_gpio_chip *pm_gpio_chip;
> + struct gpio_chip *gpio_chip;
> + int pm_gpio;
> + int found = 0;
> +
> + if (param == NULL)
> + return -EINVAL;
> + 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) {
> + found = 1;
> + pm_gpio = gpio - gpio_chip->base;
> + break;
> + }
> + }
> + if (!found) {
> + 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);
> + 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);
> +
> + mutex_lock(&pm_gpio_chip->pm_lock);
> + /* 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);
> + mutex_unlock(&pm_gpio_chip->pm_lock);
> +
> + if (rc)
> + pr_err("Failed on pm8xxx_write_buf() rc=%d (GPIO config)\n",
> + rc);
> +
> + return rc;
> +}
> +EXPORT_SYMBOL(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)
> +{
> + int rc = platform_driver_register(&pm_gpio_driver);
> +
> + return rc;
> +}
> +subsys_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);
> diff --git a/drivers/mfd/pm8921-core.c b/drivers/mfd/pm8921-core.c
> index d554551..c887ac6 100644
> --- a/drivers/mfd/pm8921-core.c
> +++ b/drivers/mfd/pm8921-core.c
> @@ -79,6 +79,22 @@ static struct pm8xxx_drvdata pm8921_drvdata = {
> .pmic_read_irq_stat = pm8921_read_irq_stat,
> };
>
> +static const struct resource gpio_cell_resources[] __devinitconst = {
> + [0] = {
> + .start = PM8921_IRQ_BLOCK_BIT(PM8921_GPIO_BLOCK_START, 0),
> + .end = PM8921_IRQ_BLOCK_BIT(PM8921_GPIO_BLOCK_START, 0)
> + + PM8921_NR_GPIOS - 1,
> + .flags = IORESOURCE_IRQ,
> + },
> +};
> +
> +static struct mfd_cell gpio_cell __devinitdata = {
> + .name = PM8XXX_GPIO_DEV_NAME,
> + .id = -1,
> + .resources = gpio_cell_resources,
> + .num_resources = ARRAY_SIZE(gpio_cell_resources),
> +};
> +
> static int __devinit pm8921_add_subdevices(const struct pm8921_platform_data
> *pdata,
> struct pm8921 *pmic,
> @@ -103,7 +119,25 @@ static int __devinit pm8921_add_subdevices(const struct pm8921_platform_data
> pmic->irq_data = irq_data;
> }
>
> + if (pdata->gpio_pdata) {
> + pdata->gpio_pdata->gpio_cdata.ngpios = PM8921_NR_GPIOS;
> + pdata->gpio_pdata->gpio_cdata.rev = rev;
> + gpio_cell.platform_data = pdata->gpio_pdata;
> + gpio_cell.data_size = sizeof(struct pm8xxx_gpio_platform_data);
> + ret = mfd_add_devices(pmic->dev, 0, &gpio_cell, 1,
> + NULL, irq_base);
> + if (ret) {
> + pr_err("Failed to add gpio subdevice ret=%d\n", ret);
> + goto bail;
> + }
> + }
> +
> + return 0;
> bail:
> + if (pmic->irq_data) {
> + pm8xxx_irq_exit(pmic->irq_data);
> + pmic->irq_data = NULL;
> + }
> return ret;
> }
>
> diff --git a/include/linux/mfd/pm8921.h b/include/linux/mfd/pm8921.h
> index d2806ff..74d47c7 100644
> --- a/include/linux/mfd/pm8921.h
> +++ b/include/linux/mfd/pm8921.h
> @@ -19,12 +19,23 @@
>
> #include <linux/device.h>
> #include <linux/mfd/pm8xxx/irq.h>
> +#include <linux/mfd/pm8xxx/gpio.h>
>
> #define PM8921_NR_IRQS 256
>
> +#define PM8921_NR_GPIOS 44
> +
> +#define PM8921_GPIO_BLOCK_START 24
> +#define PM8921_IRQ_BLOCK_BIT(block, bit) ((block) * 8 + (bit))
> +
> +/* GPIOs [1,N] */
> +#define PM8921_GPIO_IRQ(base, gpio) ((base) + \
> + PM8921_IRQ_BLOCK_BIT(PM8921_GPIO_BLOCK_START, (gpio)-1))
> +
> struct pm8921_platform_data {
> int irq_base;
> struct pm8xxx_irq_platform_data *irq_pdata;
> + struct pm8xxx_gpio_platform_data *gpio_pdata;
> };
>
> #endif
> diff --git a/include/linux/mfd/pm8xxx/gpio.h b/include/linux/mfd/pm8xxx/gpio.h
> new file mode 100644
> index 0000000..3ab08e0
> --- /dev/null
> +++ b/include/linux/mfd/pm8xxx/gpio.h
> @@ -0,0 +1,132 @@
> +/* 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.
> + */
> +
> +/*
> + * Qualcomm PMIC8XXX gpio driver header file
> + *
> + */
> +
> +#ifndef __PM8XXX_GPIO_H
> +#define __PM8XXX_GPIO_H
> +
> +#include <linux/errno.h>
> +
> +#define PM8XXX_GPIO_DEV_NAME "pm8xxx-gpio"
> +
> +struct pm8xxx_gpio_core_data {
> + u32 rev;
> + int ngpios;
> +};
> +
> +struct pm8xxx_gpio_platform_data {
> + struct pm8xxx_gpio_core_data gpio_cdata;
> + int gpio_base;
> +};
There doesn't seem to be any value it splitting pm8xxx_gpio_core_data
into a separate structure from what I see in this patch. How is this
going to be used?
> +
> +/* GPIO parameters */
> +/* direction */
> +#define PM_GPIO_DIR_OUT 0x01
> +#define PM_GPIO_DIR_IN 0x02
> +#define PM_GPIO_DIR_BOTH (PM_GPIO_DIR_OUT | PM_GPIO_DIR_IN)
> +
> +/* output_buffer */
> +#define PM_GPIO_OUT_BUF_OPEN_DRAIN 1
> +#define PM_GPIO_OUT_BUF_CMOS 0
> +
> +/* pull */
> +#define PM_GPIO_PULL_UP_30 0
> +#define PM_GPIO_PULL_UP_1P5 1
> +#define PM_GPIO_PULL_UP_31P5 2
> +#define PM_GPIO_PULL_UP_1P5_30 3
> +#define PM_GPIO_PULL_DN 4
> +#define PM_GPIO_PULL_NO 5
> +
> +/* vin_sel: Voltage Input Select */
> +#define PM_GPIO_VIN_VPH 0
> +#define PM_GPIO_VIN_BB 1
> +#define PM_GPIO_VIN_S3 2
> +#define PM_GPIO_VIN_L3 3
> +#define PM_GPIO_VIN_L7 4
> +#define PM_GPIO_VIN_L6 5
> +#define PM_GPIO_VIN_L5 6
> +#define PM_GPIO_VIN_L2 7
> +
> +/* out_strength */
> +#define PM_GPIO_STRENGTH_NO 0
> +#define PM_GPIO_STRENGTH_HIGH 1
> +#define PM_GPIO_STRENGTH_MED 2
> +#define PM_GPIO_STRENGTH_LOW 3
> +
> +/* function */
> +#define PM_GPIO_FUNC_NORMAL 0
> +#define PM_GPIO_FUNC_PAIRED 1
> +#define PM_GPIO_FUNC_1 2
> +#define PM_GPIO_FUNC_2 3
> +#define PM_GPIO_DTEST1 4
> +#define PM_GPIO_DTEST2 5
> +#define PM_GPIO_DTEST3 6
> +#define PM_GPIO_DTEST4 7
> +
> +/**
> + * struct pm_gpio - structure to specify gpio configurtion values
> + * @direction: indicates whether the gpio should be input, output, or
> + * both. Should be of the type PM_GPIO_DIR_*
> + * @output_buffer: indicates gpio should be configured as CMOS or open
> + * drain. Should be of the type PM_GPIO_OUT_BUF_*
> + * @output_value: The gpio output value of the gpio line - 0 or 1
> + * @pull: Indicates whether a pull up or pull down should be
> + * applied. If a pullup is required the current strength
> + * needs to be specified. Current values of 30uA, 1.5uA,
> + * 31.5uA, 1.5uA with 30uA boost are supported. This value
> + * should be one of the PM_GPIO_PULL_*
> + * @vin_sel: specifies the voltage level when the output is set to 1.
> + * For an input gpio specifies the voltage level at which
> + * the input is interpreted as a logical 1.
> + * @out_strength: the amount of current supplied for an output gpio,
> + * should be of the type PM_GPIO_STRENGTH_*
> + * @function: choose alternate function for the gpio. Certain gpios
> + * can be paired (shorted) with each other. Some gpio pin
> + * can act as alternate functions. This parameter should
> + * be of type PM_GPIO_FUNC_*
> + * @inv_int_pol: Invert polarity before feeding the line to the interrupt
> + * module in pmic. This feature will almost be never used
> + * since the pm8xxx interrupt block can detect both edges
> + * and both levels.
> + */
> +struct pm_gpio {
> + int direction;
> + int output_buffer;
> + int output_value;
> + int pull;
> + int vin_sel;
> + int out_strength;
> + int function;
> + int inv_int_pol;
> +};
> +
> +#if defined(CONFIG_GPIO_PM8XXX) || defined(CONFIG_GPIO_PM8XXX_MODULE)
> +/**
> + * pm8xxx_gpio_config - configure a gpio controlled by a pm8xxx chip
> + * @gpio: gpio number to configure
> + * @param: configuration values
> + *
> + * RETURNS: an appropriate -ERRNO error value on error, or zero for success.
> + */
> +int pm8xxx_gpio_config(int gpio, struct pm_gpio *param);
> +#else
> +static inline int pm8xxx_gpio_config(int gpio, struct pm_gpio *param)
> +{
> + return -ENXIO;
> +}
> +#endif
> +
> +#endif
> --
> 1.7.1
>
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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