On Wed, Nov 7, 2012 at 4:44 PM, Peter Ujfalusi <peter.ujfalusi@xxxxxx> wrote: > The driver supports the following LED outputs as generic PWM driver: > TWL4030 LEDA and LEDB (PWMA and PWMB) > TWL6030 Charging indicator LED (PWM LED) > > On TWL6030 when the PWM requested LED is configured to be controlled by SW. > In this case the user can enable/disable and set the duty period freely. > When the PWM has been freed, the LED driver is put back to HW control. > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > --- > drivers/pwm/Kconfig | 10 ++ > drivers/pwm/Makefile | 1 + > drivers/pwm/pwm-twl-led.c | 287 ++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 298 insertions(+) > create mode 100644 drivers/pwm/pwm-twl-led.c > > diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig > index c577db9..49c2082 100644 > --- a/drivers/pwm/Kconfig > +++ b/drivers/pwm/Kconfig > @@ -152,6 +152,16 @@ config PWM_TWL > To compile this driver as a module, choose M here: the module > will be called pwm-twl. > > +config PWM_TWL_LED > + tristate "TWL4030/6030 PWM support for LED drivers" > + select HAVE_PWM > + depends on TWL4030_CORE > + help > + Generic PWM framework driver for TWL4030/6030 LED. > + > + To compile this driver as a module, choose M here: the module > + will be called pwm-twl-led. > + > config PWM_VT8500 > tristate "vt8500 pwm support" > depends on ARCH_VT8500 > diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile > index 3324c06..5f26134 100644 > --- a/drivers/pwm/Makefile > +++ b/drivers/pwm/Makefile > @@ -12,4 +12,5 @@ obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o > obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o > obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o > obj-$(CONFIG_PWM_TWL) += pwm-twl.o > +obj-$(CONFIG_PWM_TWL_LED) += pwm-twl-led.o > obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o > diff --git a/drivers/pwm/pwm-twl-led.c b/drivers/pwm/pwm-twl-led.c > new file mode 100644 > index 0000000..4d6ddc9 > --- /dev/null > +++ b/drivers/pwm/pwm-twl-led.c > @@ -0,0 +1,287 @@ > +/* > + * Driver for TWL4030/6030 Pulse Width Modulator used as LED driver > + * > + * Copyright (C) 2012 Texas Instruments > + * Author: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > + * > + * This driver is a complete rewrite of the former pwm-twl6030.c authorded by: > + * Hemanth V <hemanthv@xxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License 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. > + * > + * You should have received a copy of the GNU General Public License along with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/pwm.h> > +#include <linux/i2c/twl.h> > +#include <linux/slab.h> > + > +#define TWL4030_LED_MAX 0x7f > +#define TWL6030_LED_MAX 0xff > + > +/* Registers, bits and macro for TWL4030 */ > +#define TWL4030_LEDEN_REG 0x00 > +#define TWL4030_PWMA_REG 0x01 > + > +#define TWL4030_LEDXON (1 << 0) > +#define TWL4030_LEDXPWM (1 << 4) > +#define TWL4030_LED_PINS (TWL4030_LEDXON | TWL4030_LEDXPWM) > +#define TWL4030_LED_TOGGLE(led, x) ((x) << (led)) > + > +/* Register, bits and macro for TWL6030 */ > +#define TWL6030_LED_PWM_CTRL1 0xf4 > +#define TWL6030_LED_PWM_CTRL2 0xf5 > + > +#define TWL6040_LED_MODE_HW 0x00 > +#define TWL6040_LED_MODE_ON 0x01 > +#define TWL6040_LED_MODE_OFF 0x02 > +#define TWL6040_LED_MODE_MASK 0x03 > + > +struct twl_pwmled_chip { > + struct pwm_chip chip; > +}; > + > +static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm, > + int duty_ns, int period_ns) > +{ > + int duty_cycle = (duty_ns * TWL4030_LED_MAX) / period_ns; > + u8 on_time; > + u8 pwm_config[2]; > + int base, ret; > + > + if (duty_cycle >= TWL4030_LED_MAX) > + on_time = TWL4030_LED_MAX; > + else if (!duty_cycle) > + on_time = TWL4030_LED_MAX - 1; > + else > + on_time = TWL4030_LED_MAX - duty_cycle; > + > + base = pwm->hwpwm * 2 + TWL4030_PWMA_REG; > + > + pwm_config[0] = on_time; > + pwm_config[1] = TWL4030_LED_MAX; > + > + ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2); Shouldn't this use TWL4030_MODULE_PWMA and TWL4030_MODULE_PWMB as first argument? I can guess it works your way too, but TWL4030_MODULE_PWMx would match the TRM better. -- Gražvydas -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
