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pwm: Move AB8500 PWM driver to PWM framework

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This commit moves the driver to drivers/pwm and converts it to the new
PWM framework.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arun Murthy <arun.murthy@stericsson.com>
This commit is contained in:
Thierry Reding 2012-08-31 11:46:24 +02:00
parent 0bcf168b02
commit 6173f8f4ed
5 changed files with 60 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/misc/Kconfig
View File

@ -60,16 +60,6 @@ config ATMEL_PWM
purposes including software controlled power-efficient backlights
on LCD displays, motor control, and waveform generation.
config AB8500_PWM
bool "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500
select HAVE_PWM
depends on !PWM
help
This driver exports functions to enable/disble/config/free Pulse
Width Modulation in the Analog Baseband Chip AB8500.
It is used by led and backlight driver to control the intensity.
config ATMEL_TCLIB
bool "Atmel AT32/AT91 Timer/Counter Library"
depends on (AVR32 || ARCH_AT91)

1
drivers/misc/Makefile
View File

@ -44,7 +44,6 @@ obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
obj-$(CONFIG_PCH_PHUB) += pch_phub.o
obj-y += ti-st/
obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
obj-y += lis3lv02d/
obj-y += carma/
obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o

9
drivers/pwm/Kconfig
View File

@ -29,6 +29,15 @@ menuconfig PWM
if PWM
config PWM_AB8500
tristate "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500
help
Generic PWM framework driver for Analog Baseband AB8500.
To compile this driver as a module, choose M here: the module
will be called pwm-ab8500.
config PWM_BFIN
tristate "Blackfin PWM support"
depends on BFIN_GPTIMERS

1
drivers/pwm/Makefile
View File

@ -1,4 +1,5 @@
obj-$(CONFIG_PWM) += core.o
obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o

116
drivers/misc/ab8500-pwm.c → drivers/pwm/pwm-ab8500.c
View File

@ -24,16 +24,12 @@
#define ENABLE_PWM 1
#define DISABLE_PWM 0
struct pwm_device {
struct device *dev;
struct list_head node;
const char *label;
unsigned int pwm_id;
struct ab8500_pwm_chip {
struct pwm_chip chip;
};
static LIST_HEAD(pwm_list);
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
int ret = 0;
unsigned int higher_val, lower_val;
@ -50,95 +46,94 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
*/
higher_val = ((duty_ns & 0x0300) >> 8);
reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2);
reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
reg, (u8)lower_val);
if (ret < 0)
return ret;
ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC,
ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
(reg + 1), (u8)higher_val);
return ret;
}
EXPORT_SYMBOL(pwm_config);
int pwm_enable(struct pwm_device *pwm)
static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
int ret;
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
ret = abx500_mask_and_set_register_interruptible(chip->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
1 << (pwm->pwm_id-1), ENABLE_PWM);
1 << (chip->base - 1), ENABLE_PWM);
if (ret < 0)
dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return ret;
}
EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
int ret;
ret = abx500_mask_and_set_register_interruptible(pwm->dev,
ret = abx500_mask_and_set_register_interruptible(chip->dev,
AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
1 << (pwm->pwm_id-1), DISABLE_PWM);
1 << (chip->base - 1), DISABLE_PWM);
if (ret < 0)
dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return;
}
EXPORT_SYMBOL(pwm_disable);
struct pwm_device *pwm_request(int pwm_id, const char *label)
{
struct pwm_device *pwm;
list_for_each_entry(pwm, &pwm_list, node) {
if (pwm->pwm_id == pwm_id) {
pwm->label = label;
pwm->pwm_id = pwm_id;
return pwm;
}
}
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(pwm_request);
void pwm_free(struct pwm_device *pwm)
{
pwm_disable(pwm);
}
EXPORT_SYMBOL(pwm_free);
static const struct pwm_ops ab8500_pwm_ops = {
.config = ab8500_pwm_config,
.enable = ab8500_pwm_enable,
.disable = ab8500_pwm_disable,
};
static int __devinit ab8500_pwm_probe(struct platform_device *pdev)
{
struct pwm_device *pwm;
struct ab8500_pwm_chip *ab8500;
int err;
/*
* Nothing to be done in probe, this is required to get the
* device which is required for ab8500 read and write
*/
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
if (pwm == NULL) {
ab8500 = kzalloc(sizeof(*ab8500), GFP_KERNEL);
if (ab8500 == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
pwm->dev = &pdev->dev;
pwm->pwm_id = pdev->id;
list_add_tail(&pwm->node, &pwm_list);
platform_set_drvdata(pdev, pwm);
dev_dbg(pwm->dev, "pwm probe successful\n");
ab8500->chip.dev = &pdev->dev;
ab8500->chip.ops = &ab8500_pwm_ops;
ab8500->chip.base = pdev->id;
ab8500->chip.npwm = 1;
err = pwmchip_add(&ab8500->chip);
if (err < 0) {
kfree(ab8500);
return err;
}
dev_dbg(&pdev->dev, "pwm probe successful\n");
platform_set_drvdata(pdev, ab8500);
return 0;
}
static int __devexit ab8500_pwm_remove(struct platform_device *pdev)
{
struct pwm_device *pwm = platform_get_drvdata(pdev);
list_del(&pwm->node);
struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
int err;
err = pwmchip_remove(&ab8500->chip);
if (err < 0)
return err;
dev_dbg(&pdev->dev, "pwm driver removed\n");
kfree(pwm);
kfree(ab8500);
return 0;
}
@ -150,19 +145,8 @@ static struct platform_driver ab8500_pwm_driver = {
.probe = ab8500_pwm_probe,
.remove = __devexit_p(ab8500_pwm_remove),
};
module_platform_driver(ab8500_pwm_driver);
static int __init ab8500_pwm_init(void)
{
return platform_driver_register(&ab8500_pwm_driver);
}
static void __exit ab8500_pwm_exit(void)
{
platform_driver_unregister(&ab8500_pwm_driver);
}
subsys_initcall(ab8500_pwm_init);
module_exit(ab8500_pwm_exit);
MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
MODULE_ALIAS("platform:ab8500-pwm");