mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
430 lines
11 KiB
C
430 lines
11 KiB
C
/*
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* gpio-regulator.c
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*
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* Copyright 2011 Heiko Stuebner <heiko@sntech.de>
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*
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* based on fixed.c
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* Copyright (c) 2009 Nokia Corporation
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* Roger Quadros <ext-roger.quadros@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This is useful for systems with mixed controllable and
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* non-controllable regulators, as well as for allowing testing on
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* systems with no controllable regulators.
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*/
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/regulator/gpio-regulator.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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struct gpio_regulator_data {
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struct regulator_desc desc;
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struct regulator_dev *dev;
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struct gpio *gpios;
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int nr_gpios;
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struct gpio_regulator_state *states;
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int nr_states;
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int state;
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};
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static int gpio_regulator_get_value(struct regulator_dev *dev)
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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int ptr;
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for (ptr = 0; ptr < data->nr_states; ptr++)
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if (data->states[ptr].gpios == data->state)
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return data->states[ptr].value;
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return -EINVAL;
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}
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static int gpio_regulator_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV,
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unsigned *selector)
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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int ptr, target = 0, state, best_val = INT_MAX;
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for (ptr = 0; ptr < data->nr_states; ptr++)
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if (data->states[ptr].value < best_val &&
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data->states[ptr].value >= min_uV &&
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data->states[ptr].value <= max_uV) {
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target = data->states[ptr].gpios;
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best_val = data->states[ptr].value;
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if (selector)
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*selector = ptr;
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}
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if (best_val == INT_MAX)
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return -EINVAL;
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for (ptr = 0; ptr < data->nr_gpios; ptr++) {
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state = (target & (1 << ptr)) >> ptr;
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gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
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}
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data->state = target;
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return 0;
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}
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static int gpio_regulator_list_voltage(struct regulator_dev *dev,
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unsigned selector)
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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if (selector >= data->nr_states)
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return -EINVAL;
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return data->states[selector].value;
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}
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static int gpio_regulator_set_current_limit(struct regulator_dev *dev,
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int min_uA, int max_uA)
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{
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struct gpio_regulator_data *data = rdev_get_drvdata(dev);
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int ptr, target = 0, state, best_val = 0;
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for (ptr = 0; ptr < data->nr_states; ptr++)
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if (data->states[ptr].value > best_val &&
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data->states[ptr].value >= min_uA &&
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data->states[ptr].value <= max_uA) {
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target = data->states[ptr].gpios;
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best_val = data->states[ptr].value;
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}
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if (best_val == 0)
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return -EINVAL;
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for (ptr = 0; ptr < data->nr_gpios; ptr++) {
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state = (target & (1 << ptr)) >> ptr;
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gpio_set_value_cansleep(data->gpios[ptr].gpio, state);
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}
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data->state = target;
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return 0;
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}
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static struct regulator_ops gpio_regulator_voltage_ops = {
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.get_voltage = gpio_regulator_get_value,
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.set_voltage = gpio_regulator_set_voltage,
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.list_voltage = gpio_regulator_list_voltage,
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};
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static struct gpio_regulator_config *
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of_get_gpio_regulator_config(struct device *dev, struct device_node *np,
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const struct regulator_desc *desc)
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{
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struct gpio_regulator_config *config;
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const char *regtype;
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int proplen, gpio, i;
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int ret;
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config = devm_kzalloc(dev,
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sizeof(struct gpio_regulator_config),
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GFP_KERNEL);
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if (!config)
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return ERR_PTR(-ENOMEM);
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config->init_data = of_get_regulator_init_data(dev, np, desc);
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if (!config->init_data)
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return ERR_PTR(-EINVAL);
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config->supply_name = config->init_data->constraints.name;
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if (of_property_read_bool(np, "enable-active-high"))
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config->enable_high = true;
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if (of_property_read_bool(np, "enable-at-boot"))
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config->enabled_at_boot = true;
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of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
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config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
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if (config->enable_gpio < 0 && config->enable_gpio != -ENOENT)
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return ERR_PTR(config->enable_gpio);
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/* Fetch GPIOs. - optional property*/
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ret = of_gpio_count(np);
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if ((ret < 0) && (ret != -ENOENT))
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return ERR_PTR(ret);
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if (ret > 0) {
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config->nr_gpios = ret;
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config->gpios = devm_kcalloc(dev,
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config->nr_gpios, sizeof(struct gpio),
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GFP_KERNEL);
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if (!config->gpios)
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return ERR_PTR(-ENOMEM);
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proplen = of_property_count_u32_elems(np, "gpios-states");
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/* optional property */
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if (proplen < 0)
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proplen = 0;
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if (proplen > 0 && proplen != config->nr_gpios) {
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dev_warn(dev, "gpios <-> gpios-states mismatch\n");
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proplen = 0;
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}
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for (i = 0; i < config->nr_gpios; i++) {
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gpio = of_get_named_gpio(np, "gpios", i);
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if (gpio < 0) {
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if (gpio != -ENOENT)
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return ERR_PTR(gpio);
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break;
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}
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config->gpios[i].gpio = gpio;
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config->gpios[i].label = config->supply_name;
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if (proplen > 0) {
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of_property_read_u32_index(np, "gpios-states",
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i, &ret);
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if (ret)
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config->gpios[i].flags =
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GPIOF_OUT_INIT_HIGH;
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}
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}
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}
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/* Fetch states. */
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proplen = of_property_count_u32_elems(np, "states");
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if (proplen < 0) {
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dev_err(dev, "No 'states' property found\n");
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return ERR_PTR(-EINVAL);
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}
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config->states = devm_kcalloc(dev,
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proplen / 2,
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sizeof(struct gpio_regulator_state),
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GFP_KERNEL);
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if (!config->states)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < proplen / 2; i++) {
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of_property_read_u32_index(np, "states", i * 2,
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&config->states[i].value);
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of_property_read_u32_index(np, "states", i * 2 + 1,
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&config->states[i].gpios);
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}
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config->nr_states = i;
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config->type = REGULATOR_VOLTAGE;
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ret = of_property_read_string(np, "regulator-type", ®type);
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if (ret >= 0) {
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if (!strncmp("voltage", regtype, 7))
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config->type = REGULATOR_VOLTAGE;
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else if (!strncmp("current", regtype, 7))
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config->type = REGULATOR_CURRENT;
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else
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dev_warn(dev, "Unknown regulator-type '%s'\n",
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regtype);
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}
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return config;
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}
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static struct regulator_ops gpio_regulator_current_ops = {
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.get_current_limit = gpio_regulator_get_value,
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.set_current_limit = gpio_regulator_set_current_limit,
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};
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static int gpio_regulator_probe(struct platform_device *pdev)
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{
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struct gpio_regulator_config *config = dev_get_platdata(&pdev->dev);
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struct device_node *np = pdev->dev.of_node;
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struct gpio_regulator_data *drvdata;
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struct regulator_config cfg = { };
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int ptr, ret, state;
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drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
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GFP_KERNEL);
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if (drvdata == NULL)
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return -ENOMEM;
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if (np) {
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config = of_get_gpio_regulator_config(&pdev->dev, np,
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&drvdata->desc);
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if (IS_ERR(config))
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return PTR_ERR(config);
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}
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drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
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if (drvdata->desc.name == NULL) {
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dev_err(&pdev->dev, "Failed to allocate supply name\n");
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return -ENOMEM;
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}
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if (config->nr_gpios != 0) {
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drvdata->gpios = kmemdup(config->gpios,
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config->nr_gpios * sizeof(struct gpio),
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GFP_KERNEL);
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if (drvdata->gpios == NULL) {
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dev_err(&pdev->dev, "Failed to allocate gpio data\n");
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ret = -ENOMEM;
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goto err_name;
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}
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drvdata->nr_gpios = config->nr_gpios;
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ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Could not obtain regulator setting GPIOs: %d\n",
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ret);
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goto err_memgpio;
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}
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}
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drvdata->states = kmemdup(config->states,
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config->nr_states *
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sizeof(struct gpio_regulator_state),
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GFP_KERNEL);
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if (drvdata->states == NULL) {
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dev_err(&pdev->dev, "Failed to allocate state data\n");
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ret = -ENOMEM;
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goto err_stategpio;
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}
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drvdata->nr_states = config->nr_states;
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drvdata->desc.owner = THIS_MODULE;
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drvdata->desc.enable_time = config->startup_delay;
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/* handle regulator type*/
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switch (config->type) {
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case REGULATOR_VOLTAGE:
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drvdata->desc.type = REGULATOR_VOLTAGE;
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drvdata->desc.ops = &gpio_regulator_voltage_ops;
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drvdata->desc.n_voltages = config->nr_states;
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break;
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case REGULATOR_CURRENT:
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drvdata->desc.type = REGULATOR_CURRENT;
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drvdata->desc.ops = &gpio_regulator_current_ops;
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break;
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default:
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dev_err(&pdev->dev, "No regulator type set\n");
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ret = -EINVAL;
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goto err_memstate;
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}
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/* build initial state from gpio init data. */
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state = 0;
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for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
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if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH)
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state |= (1 << ptr);
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}
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drvdata->state = state;
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cfg.dev = &pdev->dev;
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cfg.init_data = config->init_data;
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cfg.driver_data = drvdata;
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cfg.of_node = np;
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if (gpio_is_valid(config->enable_gpio)) {
|
|
cfg.ena_gpio = config->enable_gpio;
|
|
cfg.ena_gpio_initialized = true;
|
|
}
|
|
cfg.ena_gpio_invert = !config->enable_high;
|
|
if (config->enabled_at_boot) {
|
|
if (config->enable_high)
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
|
|
else
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
|
|
} else {
|
|
if (config->enable_high)
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
|
|
else
|
|
cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
|
|
}
|
|
|
|
drvdata->dev = regulator_register(&drvdata->desc, &cfg);
|
|
if (IS_ERR(drvdata->dev)) {
|
|
ret = PTR_ERR(drvdata->dev);
|
|
dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
|
|
goto err_memstate;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, drvdata);
|
|
|
|
return 0;
|
|
|
|
err_memstate:
|
|
kfree(drvdata->states);
|
|
err_stategpio:
|
|
gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
|
|
err_memgpio:
|
|
kfree(drvdata->gpios);
|
|
err_name:
|
|
kfree(drvdata->desc.name);
|
|
return ret;
|
|
}
|
|
|
|
static int gpio_regulator_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev);
|
|
|
|
regulator_unregister(drvdata->dev);
|
|
|
|
gpio_free_array(drvdata->gpios, drvdata->nr_gpios);
|
|
|
|
kfree(drvdata->states);
|
|
kfree(drvdata->gpios);
|
|
|
|
kfree(drvdata->desc.name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_OF)
|
|
static const struct of_device_id regulator_gpio_of_match[] = {
|
|
{ .compatible = "regulator-gpio", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, regulator_gpio_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver gpio_regulator_driver = {
|
|
.probe = gpio_regulator_probe,
|
|
.remove = gpio_regulator_remove,
|
|
.driver = {
|
|
.name = "gpio-regulator",
|
|
.of_match_table = of_match_ptr(regulator_gpio_of_match),
|
|
},
|
|
};
|
|
|
|
static int __init gpio_regulator_init(void)
|
|
{
|
|
return platform_driver_register(&gpio_regulator_driver);
|
|
}
|
|
subsys_initcall(gpio_regulator_init);
|
|
|
|
static void __exit gpio_regulator_exit(void)
|
|
{
|
|
platform_driver_unregister(&gpio_regulator_driver);
|
|
}
|
|
module_exit(gpio_regulator_exit);
|
|
|
|
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
|
|
MODULE_DESCRIPTION("gpio voltage regulator");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:gpio-regulator");
|