diff options
Diffstat (limited to 'arch/arm/plat-mxs/pinctrl.c')
| -rw-r--r-- | arch/arm/plat-mxs/pinctrl.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/arch/arm/plat-mxs/pinctrl.c b/arch/arm/plat-mxs/pinctrl.c new file mode 100644 index 000000000000..cdef3e02d495 --- /dev/null +++ b/arch/arm/plat-mxs/pinctrl.c @@ -0,0 +1,215 @@ +/* + * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. 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 as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/bitops.h> +#include <linux/gpio.h> +#include <linux/irq.h> + +#include <mach/pinctrl.h> + +static struct pinctrl_chip *g_chip; + +int mxs_request_pin(unsigned int pin, enum pin_fun fun, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + if (test_and_set_bit(index, &pb->bitmap)) + return -EBUSY; + pb->label[index] = lab; + if (g_chip->set_type) + g_chip->set_type(pb, index, fun); + return 0; +} +EXPORT_SYMBOL(mxs_request_pin); + +int mxs_get_type(unsigned int pin) +{ + int bank, index; + struct pin_bank *pb; + int ret = 0; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + if (g_chip->get_type) + ret = g_chip->get_type(pb, index); + return ret; +} +EXPORT_SYMBOL(mxs_get_type); + +int mxs_set_type(unsigned int pin, enum pin_fun fun, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + + if (!test_bit(index, &pb->bitmap)) + return -ENOLCK; + if (lab != pb->label[index]) /* label is const string */ + return -EINVAL; + if (g_chip->set_type) + g_chip->set_type(pb, index, fun); + return 0; +} +EXPORT_SYMBOL(mxs_set_type); + +int mxs_set_strength(unsigned int pin, enum pad_strength cfg, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + + if (!test_bit(index, &pb->bitmap)) + return -ENOLCK; + if (lab != pb->label[index]) /* label is const string */ + return -EINVAL; + if (g_chip->set_strength) + g_chip->set_strength(pb, index, cfg); + return 0; +} +EXPORT_SYMBOL(mxs_set_strength); + +int mxs_set_voltage(unsigned int pin, enum pad_voltage cfg, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + + if (!test_bit(index, &pb->bitmap)) + return -ENOLCK; + if (lab != pb->label[index]) /* label is const string */ + return -EINVAL; + if (g_chip->set_voltage) + g_chip->set_voltage(pb, index, cfg); + return 0; +} +EXPORT_SYMBOL(mxs_set_voltage); + +int mxs_set_pullup(unsigned int pin, int en, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + + if (!test_bit(index, &pb->bitmap)) + return -ENOLCK; + if (lab != pb->label[index]) /* label is const string */ + return -EINVAL; + if (g_chip->set_pullup) + g_chip->set_pullup(pb, index, en); + return 0; +} +EXPORT_SYMBOL(mxs_set_pullup); + +void mxs_release_pin(unsigned int pin, const char *lab) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return; + + pb = g_chip->banks + bank; + + if (!test_bit(index, &pb->bitmap)) + return; + if (lab != pb->label[index]) /* label is const string */ + return; + pb->label[index] = NULL; + + clear_bit(index, &pb->bitmap); +} +EXPORT_SYMBOL(mxs_release_pin); + +unsigned int mxs_pin2gpio(unsigned int pin) +{ + int bank, index; + struct pin_bank *pb; + if (g_chip == NULL) + return -ENODEV; + + if (!g_chip->get_gpio) + return -ENODEV; + + bank = g_chip->pin2id(g_chip, pin, &index); + if (bank < 0 || index < 0 || bank >= g_chip->bank_size) + return -EFAULT; + + pb = g_chip->banks + bank; + + return g_chip->get_gpio(pb, index); +} + +int __init mxs_set_pinctrl_chip(struct pinctrl_chip *chip) +{ + if (!(chip && chip->banks && chip->bank_size && + chip->get_gpio && chip->pin2id)) + return -EINVAL; + + if (g_chip) + return -EEXIST; + g_chip = chip; + return 0; +}; |