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pwm: Move TWL6030 PWM driver to PWM framework

Browse Source 
This commit moves the driver to drivers/pwm and converts it to the new
PWM framework. In order for this to work properly, register the PWM as
child of the multi-function TWL6030 device.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Reding 2012-09-18 10:29:51 +02:00 committed by Samuel Ortiz
parent f78959cfa3
commit 48a364b758
6 changed files with 89 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/mfd/Kconfig
View File

@ -298,16 +298,6 @@ config MFD_TWL4030_AUDIO
select MFD_CORE
default n
config TWL6030_PWM
tristate "TWL6030 PWM (Pulse Width Modulator) Support"
depends on TWL4030_CORE
select HAVE_PWM
depends on !PWM
default n
help
Say yes here if you want support for TWL6030 PWM.
This is used to control charging LED brightness.
config TWL6040_CORE
bool "Support for TWL6040 audio codec"
depends on I2C=y && GENERIC_HARDIRQS

1
drivers/mfd/Makefile
View File

@ -63,7 +63,6 @@ obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
obj-$(CONFIG_TWL4030_POWER) += twl4030-power.o
obj-$(CONFIG_MFD_TWL4030_AUDIO) += twl4030-audio.o
obj-$(CONFIG_TWL6030_PWM) += twl6030-pwm.o
obj-$(CONFIG_TWL6040_CORE) += twl6040-core.o twl6040-irq.o
obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o

7
drivers/mfd/twl-core.c
View File

@ -670,6 +670,13 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
return PTR_ERR(child);
}
if (IS_ENABLED(CONFIG_PWM_TWL6030) && twl_class_is_6030()) {
child = add_child(TWL6030_MODULE_ID1, "twl6030-pwm", NULL, 0,
false, 0, 0);
if (IS_ERR(child))
return PTR_ERR(child);
}
if (IS_ENABLED(CONFIG_TWL4030_USB) && pdata->usb &&
twl_class_is_4030()) {

9
drivers/pwm/Kconfig
View File

@ -96,6 +96,15 @@ config PWM_TIEHRPWM
To compile this driver as a module, choose M here: the module
will be called pwm-tiehrpwm.
config PWM_TWL6030
tristate "TWL6030 PWM support"
depends on TWL4030_CORE
help
Generic PWM framework driver for TWL6030.
To compile this driver as a module, choose M here: the module
will be called pwm-twl6030.
config PWM_VT8500
tristate "vt8500 pwm support"
depends on ARCH_VT8500

1
drivers/pwm/Makefile
View File

@ -8,4 +8,5 @@ obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o
obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o
obj-$(CONFIG_PWM_TWL6030) += pwm-twl6030.o
obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o

125
drivers/mfd/twl6030-pwm.c → drivers/pwm/pwm-twl6030.c
View File

@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/i2c/twl.h>
#include <linux/slab.h>
@ -45,40 +46,54 @@
#define PWM_CTRL2_MODE_MASK 0x3
struct pwm_device {
const char *label;
unsigned int pwm_id;
struct twl6030_pwm_chip {
struct pwm_chip chip;
};
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
static int twl6030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
u8 duty_cycle;
int ret;
u8 val;
/* Configure PWM */
val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC |
PWM_CTRL2_MODE_HW;
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
if (ret < 0) {
dev_err(chip->dev, "%s: Failed to configure PWM, Error %d\n",
pwm->label, ret);
return ret;
}
return 0;
}
static int twl6030_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
u8 duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns;
int ret;
if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
return -EINVAL;
duty_cycle = (duty_ns * PWM_CTRL1_MAX) / period_ns;
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, duty_cycle, LED_PWM_CTRL1);
if (ret < 0) {
pr_err("%s: Failed to configure PWM, Error %d\n",
pwm->label, ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL(pwm_config);
int pwm_enable(struct pwm_device *pwm)
static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
u8 val;
int ret;
u8 val;
ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
if (ret < 0) {
pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
pwm->label, ret);
return ret;
}
@ -88,23 +103,23 @@ int pwm_enable(struct pwm_device *pwm)
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
if (ret < 0) {
pr_err("%s: Failed to enable PWM, Error %d\n", pwm->label, ret);
dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
pwm->label, ret);
return ret;
}
twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
return 0;
}
EXPORT_SYMBOL(pwm_enable);
void pwm_disable(struct pwm_device *pwm)
static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
u8 val;
int ret;
u8 val;
ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, LED_PWM_CTRL2);
if (ret < 0) {
pr_err("%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return;
}
@ -114,52 +129,56 @@ void pwm_disable(struct pwm_device *pwm)
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
if (ret < 0) {
pr_err("%s: Failed to disable PWM, Error %d\n",
dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
pwm->label, ret);
return;
}
return;
}
EXPORT_SYMBOL(pwm_disable);
struct pwm_device *pwm_request(int pwm_id, const char *label)
static const struct pwm_ops twl6030_pwm_ops = {
.request = twl6030_pwm_request,
.config = twl6030_pwm_config,
.enable = twl6030_pwm_enable,
.disable = twl6030_pwm_disable,
};
static int twl6030_pwm_probe(struct platform_device *pdev)
{
u8 val;
struct twl6030_pwm_chip *twl6030;
int ret;
struct pwm_device *pwm;
pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
if (pwm == NULL) {
pr_err("%s: failed to allocate memory\n", label);
return NULL;
}
twl6030 = devm_kzalloc(&pdev->dev, sizeof(*twl6030), GFP_KERNEL);
if (!twl6030)
return -ENOMEM;
pwm->label = label;
pwm->pwm_id = pwm_id;
twl6030->chip.dev = &pdev->dev;
twl6030->chip.ops = &twl6030_pwm_ops;
twl6030->chip.base = -1;
twl6030->chip.npwm = 1;
/* Configure PWM */
val = PWM_CTRL2_DIS_PD | PWM_CTRL2_CURR_02 | PWM_CTRL2_SRC_VAC |
PWM_CTRL2_MODE_HW;
ret = pwmchip_add(&twl6030->chip);
if (ret < 0)
return ret;
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, LED_PWM_CTRL2);
platform_set_drvdata(pdev, twl6030);
if (ret < 0) {
pr_err("%s: Failed to configure PWM, Error %d\n",
pwm->label, ret);
kfree(pwm);
return NULL;
}
return pwm;
return 0;
}
EXPORT_SYMBOL(pwm_request);
void pwm_free(struct pwm_device *pwm)
static int twl6030_pwm_remove(struct platform_device *pdev)
{
pwm_disable(pwm);
kfree(pwm);
}
EXPORT_SYMBOL(pwm_free);
struct twl6030_pwm_chip *twl6030 = platform_get_drvdata(pdev);
return pwmchip_remove(&twl6030->chip);
}
static struct platform_driver twl6030_pwm_driver = {
.driver = {
.name = "twl6030-pwm",
},
.probe = twl6030_pwm_probe,
.remove = __devexit_p(twl6030_pwm_remove),
};
module_platform_driver(twl6030_pwm_driver);
MODULE_ALIAS("platform:twl6030-pwm");
MODULE_LICENSE("GPL");