![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>
407 lines
9.3 KiB
C
407 lines
9.3 KiB
C
/*
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* SuperH Pin Function Controller GPIO driver.
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*
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* Copyright (C) 2008 Magnus Damm
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* Copyright (C) 2009 - 2012 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include "core.h"
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struct sh_pfc_gpio_data_reg {
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const struct pinmux_data_reg *info;
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u32 shadow;
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};
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struct sh_pfc_gpio_pin {
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u8 dbit;
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u8 dreg;
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};
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struct sh_pfc_chip {
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struct sh_pfc *pfc;
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struct gpio_chip gpio_chip;
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struct sh_pfc_window *mem;
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struct sh_pfc_gpio_data_reg *regs;
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struct sh_pfc_gpio_pin *pins;
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};
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static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
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{
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struct sh_pfc_chip *chip = gpiochip_get_data(gc);
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return chip->pfc;
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}
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static void gpio_get_data_reg(struct sh_pfc_chip *chip, unsigned int offset,
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struct sh_pfc_gpio_data_reg **reg,
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unsigned int *bit)
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{
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int idx = sh_pfc_get_pin_index(chip->pfc, offset);
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struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[idx];
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*reg = &chip->regs[gpio_pin->dreg];
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*bit = gpio_pin->dbit;
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}
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static u32 gpio_read_data_reg(struct sh_pfc_chip *chip,
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const struct pinmux_data_reg *dreg)
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{
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phys_addr_t address = dreg->reg;
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void __iomem *mem = address - chip->mem->phys + chip->mem->virt;
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return sh_pfc_read_raw_reg(mem, dreg->reg_width);
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}
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static void gpio_write_data_reg(struct sh_pfc_chip *chip,
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const struct pinmux_data_reg *dreg, u32 value)
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{
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phys_addr_t address = dreg->reg;
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void __iomem *mem = address - chip->mem->phys + chip->mem->virt;
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sh_pfc_write_raw_reg(mem, dreg->reg_width, value);
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}
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static void gpio_setup_data_reg(struct sh_pfc_chip *chip, unsigned idx)
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{
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struct sh_pfc *pfc = chip->pfc;
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struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[idx];
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const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
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const struct pinmux_data_reg *dreg;
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unsigned int bit;
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unsigned int i;
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for (i = 0, dreg = pfc->info->data_regs; dreg->reg_width; ++i, ++dreg) {
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for (bit = 0; bit < dreg->reg_width; bit++) {
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if (dreg->enum_ids[bit] == pin->enum_id) {
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gpio_pin->dreg = i;
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gpio_pin->dbit = bit;
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return;
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}
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}
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}
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BUG();
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}
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static int gpio_setup_data_regs(struct sh_pfc_chip *chip)
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{
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struct sh_pfc *pfc = chip->pfc;
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const struct pinmux_data_reg *dreg;
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unsigned int i;
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/* Count the number of data registers, allocate memory and initialize
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* them.
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*/
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for (i = 0; pfc->info->data_regs[i].reg_width; ++i)
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;
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chip->regs = devm_kcalloc(pfc->dev, i, sizeof(*chip->regs),
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GFP_KERNEL);
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if (chip->regs == NULL)
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return -ENOMEM;
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for (i = 0, dreg = pfc->info->data_regs; dreg->reg_width; ++i, ++dreg) {
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chip->regs[i].info = dreg;
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chip->regs[i].shadow = gpio_read_data_reg(chip, dreg);
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}
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for (i = 0; i < pfc->info->nr_pins; i++) {
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if (pfc->info->pins[i].enum_id == 0)
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continue;
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gpio_setup_data_reg(chip, i);
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}
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return 0;
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}
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/* -----------------------------------------------------------------------------
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* Pin GPIOs
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*/
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static int gpio_pin_request(struct gpio_chip *gc, unsigned offset)
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{
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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int idx = sh_pfc_get_pin_index(pfc, offset);
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if (idx < 0 || pfc->info->pins[idx].enum_id == 0)
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return -EINVAL;
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return pinctrl_gpio_request(offset);
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}
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static void gpio_pin_free(struct gpio_chip *gc, unsigned offset)
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{
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return pinctrl_gpio_free(offset);
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}
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static void gpio_pin_set_value(struct sh_pfc_chip *chip, unsigned offset,
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int value)
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{
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struct sh_pfc_gpio_data_reg *reg;
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unsigned int bit;
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unsigned int pos;
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gpio_get_data_reg(chip, offset, ®, &bit);
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pos = reg->info->reg_width - (bit + 1);
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if (value)
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reg->shadow |= BIT(pos);
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else
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reg->shadow &= ~BIT(pos);
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gpio_write_data_reg(chip, reg->info, reg->shadow);
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}
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static int gpio_pin_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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return pinctrl_gpio_direction_input(offset);
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}
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static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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gpio_pin_set_value(gpiochip_get_data(gc), offset, value);
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return pinctrl_gpio_direction_output(offset);
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}
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static int gpio_pin_get(struct gpio_chip *gc, unsigned offset)
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{
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struct sh_pfc_chip *chip = gpiochip_get_data(gc);
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struct sh_pfc_gpio_data_reg *reg;
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unsigned int bit;
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unsigned int pos;
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gpio_get_data_reg(chip, offset, ®, &bit);
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pos = reg->info->reg_width - (bit + 1);
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return (gpio_read_data_reg(chip, reg->info) >> pos) & 1;
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}
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static void gpio_pin_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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gpio_pin_set_value(gpiochip_get_data(gc), offset, value);
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}
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static int gpio_pin_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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unsigned int i, k;
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for (i = 0; i < pfc->info->gpio_irq_size; i++) {
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const short *gpios = pfc->info->gpio_irq[i].gpios;
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for (k = 0; gpios[k] >= 0; k++) {
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if (gpios[k] == offset)
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goto found;
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}
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}
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return 0;
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found:
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return pfc->irqs[i];
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}
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static int gpio_pin_setup(struct sh_pfc_chip *chip)
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{
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struct sh_pfc *pfc = chip->pfc;
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struct gpio_chip *gc = &chip->gpio_chip;
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int ret;
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chip->pins = devm_kcalloc(pfc->dev,
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pfc->info->nr_pins, sizeof(*chip->pins),
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GFP_KERNEL);
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if (chip->pins == NULL)
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return -ENOMEM;
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ret = gpio_setup_data_regs(chip);
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if (ret < 0)
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return ret;
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gc->request = gpio_pin_request;
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gc->free = gpio_pin_free;
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gc->direction_input = gpio_pin_direction_input;
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gc->get = gpio_pin_get;
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gc->direction_output = gpio_pin_direction_output;
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gc->set = gpio_pin_set;
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gc->to_irq = gpio_pin_to_irq;
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gc->label = pfc->info->name;
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gc->parent = pfc->dev;
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gc->owner = THIS_MODULE;
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gc->base = 0;
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gc->ngpio = pfc->nr_gpio_pins;
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return 0;
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}
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/* -----------------------------------------------------------------------------
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* Function GPIOs
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*/
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#ifdef CONFIG_SUPERH
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static int gpio_function_request(struct gpio_chip *gc, unsigned offset)
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{
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static bool __print_once;
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struct sh_pfc *pfc = gpio_to_pfc(gc);
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unsigned int mark = pfc->info->func_gpios[offset].enum_id;
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unsigned long flags;
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int ret;
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if (!__print_once) {
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dev_notice(pfc->dev,
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"Use of GPIO API for function requests is deprecated."
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" Convert to pinctrl\n");
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__print_once = true;
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}
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if (mark == 0)
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return -EINVAL;
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spin_lock_irqsave(&pfc->lock, flags);
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ret = sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION);
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spin_unlock_irqrestore(&pfc->lock, flags);
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return ret;
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}
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static int gpio_function_setup(struct sh_pfc_chip *chip)
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{
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struct sh_pfc *pfc = chip->pfc;
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struct gpio_chip *gc = &chip->gpio_chip;
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gc->request = gpio_function_request;
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gc->label = pfc->info->name;
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gc->owner = THIS_MODULE;
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gc->base = pfc->nr_gpio_pins;
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gc->ngpio = pfc->info->nr_func_gpios;
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return 0;
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}
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#endif
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/* -----------------------------------------------------------------------------
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* Register/unregister
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*/
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static struct sh_pfc_chip *
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sh_pfc_add_gpiochip(struct sh_pfc *pfc, int(*setup)(struct sh_pfc_chip *),
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struct sh_pfc_window *mem)
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{
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struct sh_pfc_chip *chip;
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int ret;
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chip = devm_kzalloc(pfc->dev, sizeof(*chip), GFP_KERNEL);
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if (unlikely(!chip))
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return ERR_PTR(-ENOMEM);
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chip->mem = mem;
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chip->pfc = pfc;
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ret = setup(chip);
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if (ret < 0)
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return ERR_PTR(ret);
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ret = devm_gpiochip_add_data(pfc->dev, &chip->gpio_chip, chip);
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if (unlikely(ret < 0))
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return ERR_PTR(ret);
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dev_info(pfc->dev, "%s handling gpio %u -> %u\n",
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chip->gpio_chip.label, chip->gpio_chip.base,
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chip->gpio_chip.base + chip->gpio_chip.ngpio - 1);
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return chip;
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}
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int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
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{
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struct sh_pfc_chip *chip;
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phys_addr_t address;
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unsigned int i;
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if (pfc->info->data_regs == NULL)
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return 0;
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/* Find the memory window that contain the GPIO registers. Boards that
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* register a separate GPIO device will not supply a memory resource
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* that covers the data registers. In that case don't try to handle
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* GPIOs.
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*/
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address = pfc->info->data_regs[0].reg;
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for (i = 0; i < pfc->num_windows; ++i) {
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struct sh_pfc_window *window = &pfc->windows[i];
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if (address >= window->phys &&
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address < window->phys + window->size)
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break;
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}
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if (i == pfc->num_windows)
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return 0;
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/* If we have IRQ resources make sure their number is correct. */
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if (pfc->num_irqs != pfc->info->gpio_irq_size) {
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dev_err(pfc->dev, "invalid number of IRQ resources\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Register the real GPIOs chip. */
|
|
chip = sh_pfc_add_gpiochip(pfc, gpio_pin_setup, &pfc->windows[i]);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
pfc->gpio = chip;
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && pfc->dev->of_node)
|
|
return 0;
|
|
|
|
#ifdef CONFIG_SUPERH
|
|
/*
|
|
* Register the GPIO to pin mappings. As pins with GPIO ports
|
|
* must come first in the ranges, skip the pins without GPIO
|
|
* ports by stopping at the first range that contains such a
|
|
* pin.
|
|
*/
|
|
for (i = 0; i < pfc->nr_ranges; ++i) {
|
|
const struct sh_pfc_pin_range *range = &pfc->ranges[i];
|
|
int ret;
|
|
|
|
if (range->start >= pfc->nr_gpio_pins)
|
|
break;
|
|
|
|
ret = gpiochip_add_pin_range(&chip->gpio_chip,
|
|
dev_name(pfc->dev), range->start, range->start,
|
|
range->end - range->start + 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/* Register the function GPIOs chip. */
|
|
if (pfc->info->nr_func_gpios == 0)
|
|
return 0;
|
|
|
|
chip = sh_pfc_add_gpiochip(pfc, gpio_function_setup, NULL);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
#endif /* CONFIG_SUPERH */
|
|
|
|
return 0;
|
|
}
|