diff options
Diffstat (limited to 'arch/arm/mach-stmp378x/stmp378x_pwm_led.c')
| -rw-r--r-- | arch/arm/mach-stmp378x/stmp378x_pwm_led.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/mach-stmp378x/stmp378x_pwm_led.c b/arch/arm/mach-stmp378x/stmp378x_pwm_led.c new file mode 100644 index 000000000000..7fe4892d326b --- /dev/null +++ b/arch/arm/mach-stmp378x/stmp378x_pwm_led.c @@ -0,0 +1,54 @@ +/* + * Freescale STMP378X PWM LEDs pin multiplexing + * + * Author: Drew Bendetti <drewb@embeddedalley.com> + * + * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/module.h> +#include <mach/pinmux.h> + +#define PWM_PINID(n) STMP3XXX_PINID(1, 26 + n) + +int pwm_led_pinmux_request(int pwmn, char *title) +{ + int rc = 0; + + /* PIN_FUN1 is PWM for these pins */ + rc = stmp3xxx_request_pin(PWM_PINID(pwmn), PIN_FUN1, title); + if (rc) + return rc; + + stmp3xxx_pin_voltage(PWM_PINID(pwmn), PIN_3_3V, title); + /* pwm0-3 support 4,8,12mA; pwm4 supports 8,16,24mA + * I'm forcing 8 here since it's the only one in common + */ + stmp3xxx_pin_strength(PWM_PINID(pwmn), PIN_8MA, title); + + return 0; +} +EXPORT_SYMBOL_GPL(pwm_led_pinmux_request); + +void pwm_led_pinmux_free(int pwmn, char *title) +{ + stmp3xxx_pin_voltage(PWM_PINID(pwmn), PIN_4MA, title); + stmp3xxx_pin_strength(PWM_PINID(pwmn), PIN_1_8V, title); + + stmp3xxx_release_pin(PWM_PINID(pwmn), title); +} +EXPORT_SYMBOL_GPL(pwm_led_pinmux_free); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Drew Benedetti <drewb@embeddedalley.com>"); |