d88b25be35
Add a GPIO driver to support the GPIOs on the TC35892 I/O Expander. Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
382 lines
9.3 KiB
C
382 lines
9.3 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License, version 2
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* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/tc35892.h>
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/*
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* These registers are modified under the irq bus lock and cached to avoid
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* unnecessary writes in bus_sync_unlock.
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*/
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enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
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#define CACHE_NR_REGS 4
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#define CACHE_NR_BANKS 3
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struct tc35892_gpio {
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struct gpio_chip chip;
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struct tc35892 *tc35892;
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struct device *dev;
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struct mutex irq_lock;
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int irq_base;
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/* Caches of interrupt control registers for bus_lock */
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u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
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u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
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};
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static inline struct tc35892_gpio *to_tc35892_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct tc35892_gpio, chip);
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}
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static int tc35892_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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u8 reg = TC35892_GPIODATA0 + (offset / 8) * 2;
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u8 mask = 1 << (offset % 8);
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int ret;
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ret = tc35892_reg_read(tc35892, reg);
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if (ret < 0)
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return ret;
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return ret & mask;
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}
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static void tc35892_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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u8 reg = TC35892_GPIODATA0 + (offset / 8) * 2;
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unsigned pos = offset % 8;
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u8 data[] = {!!val << pos, 1 << pos};
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tc35892_block_write(tc35892, reg, ARRAY_SIZE(data), data);
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}
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static int tc35892_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int val)
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{
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struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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u8 reg = TC35892_GPIODIR0 + offset / 8;
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unsigned pos = offset % 8;
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tc35892_gpio_set(chip, offset, val);
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return tc35892_set_bits(tc35892, reg, 1 << pos, 1 << pos);
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}
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static int tc35892_gpio_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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u8 reg = TC35892_GPIODIR0 + offset / 8;
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unsigned pos = offset % 8;
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return tc35892_set_bits(tc35892, reg, 1 << pos, 0);
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}
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static int tc35892_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct tc35892_gpio *tc35892_gpio = to_tc35892_gpio(chip);
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return tc35892_gpio->irq_base + offset;
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}
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static struct gpio_chip template_chip = {
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.label = "tc35892",
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.owner = THIS_MODULE,
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.direction_input = tc35892_gpio_direction_input,
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.get = tc35892_gpio_get,
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.direction_output = tc35892_gpio_direction_output,
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.set = tc35892_gpio_set,
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.to_irq = tc35892_gpio_to_irq,
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.can_sleep = 1,
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};
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static int tc35892_gpio_irq_set_type(unsigned int irq, unsigned int type)
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{
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struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
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int offset = irq - tc35892_gpio->irq_base;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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if (type == IRQ_TYPE_EDGE_BOTH) {
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tc35892_gpio->regs[REG_IBE][regoffset] |= mask;
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return 0;
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}
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tc35892_gpio->regs[REG_IBE][regoffset] &= ~mask;
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if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
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tc35892_gpio->regs[REG_IS][regoffset] |= mask;
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else
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tc35892_gpio->regs[REG_IS][regoffset] &= ~mask;
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if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
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tc35892_gpio->regs[REG_IEV][regoffset] |= mask;
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else
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tc35892_gpio->regs[REG_IEV][regoffset] &= ~mask;
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return 0;
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}
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static void tc35892_gpio_irq_lock(unsigned int irq)
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{
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struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
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mutex_lock(&tc35892_gpio->irq_lock);
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}
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static void tc35892_gpio_irq_sync_unlock(unsigned int irq)
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{
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struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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static const u8 regmap[] = {
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[REG_IBE] = TC35892_GPIOIBE0,
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[REG_IEV] = TC35892_GPIOIEV0,
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[REG_IS] = TC35892_GPIOIS0,
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[REG_IE] = TC35892_GPIOIE0,
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};
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int i, j;
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for (i = 0; i < CACHE_NR_REGS; i++) {
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for (j = 0; j < CACHE_NR_BANKS; j++) {
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u8 old = tc35892_gpio->oldregs[i][j];
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u8 new = tc35892_gpio->regs[i][j];
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if (new == old)
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continue;
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tc35892_gpio->oldregs[i][j] = new;
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tc35892_reg_write(tc35892, regmap[i] + j * 8, new);
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}
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}
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mutex_unlock(&tc35892_gpio->irq_lock);
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}
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static void tc35892_gpio_irq_mask(unsigned int irq)
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{
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struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
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int offset = irq - tc35892_gpio->irq_base;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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tc35892_gpio->regs[REG_IE][regoffset] &= ~mask;
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}
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static void tc35892_gpio_irq_unmask(unsigned int irq)
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{
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struct tc35892_gpio *tc35892_gpio = get_irq_chip_data(irq);
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int offset = irq - tc35892_gpio->irq_base;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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tc35892_gpio->regs[REG_IE][regoffset] |= mask;
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}
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static struct irq_chip tc35892_gpio_irq_chip = {
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.name = "tc35892-gpio",
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.bus_lock = tc35892_gpio_irq_lock,
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.bus_sync_unlock = tc35892_gpio_irq_sync_unlock,
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.mask = tc35892_gpio_irq_mask,
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.unmask = tc35892_gpio_irq_unmask,
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.set_type = tc35892_gpio_irq_set_type,
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};
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static irqreturn_t tc35892_gpio_irq(int irq, void *dev)
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{
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struct tc35892_gpio *tc35892_gpio = dev;
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struct tc35892 *tc35892 = tc35892_gpio->tc35892;
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u8 status[CACHE_NR_BANKS];
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int ret;
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int i;
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ret = tc35892_block_read(tc35892, TC35892_GPIOMIS0,
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ARRAY_SIZE(status), status);
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if (ret < 0)
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return IRQ_NONE;
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for (i = 0; i < ARRAY_SIZE(status); i++) {
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unsigned int stat = status[i];
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if (!stat)
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continue;
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while (stat) {
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int bit = __ffs(stat);
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int line = i * 8 + bit;
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handle_nested_irq(tc35892_gpio->irq_base + line);
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stat &= ~(1 << bit);
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}
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tc35892_reg_write(tc35892, TC35892_GPIOIC0 + i, status[i]);
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}
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return IRQ_HANDLED;
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}
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static int tc35892_gpio_irq_init(struct tc35892_gpio *tc35892_gpio)
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{
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int base = tc35892_gpio->irq_base;
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int irq;
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for (irq = base; irq < base + tc35892_gpio->chip.ngpio; irq++) {
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set_irq_chip_data(irq, tc35892_gpio);
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set_irq_chip_and_handler(irq, &tc35892_gpio_irq_chip,
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handle_simple_irq);
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set_irq_nested_thread(irq, 1);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID);
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#else
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set_irq_noprobe(irq);
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#endif
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}
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return 0;
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}
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static void tc35892_gpio_irq_remove(struct tc35892_gpio *tc35892_gpio)
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{
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int base = tc35892_gpio->irq_base;
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int irq;
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for (irq = base; irq < base + tc35892_gpio->chip.ngpio; irq++) {
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#ifdef CONFIG_ARM
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set_irq_flags(irq, 0);
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#endif
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set_irq_chip_and_handler(irq, NULL, NULL);
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set_irq_chip_data(irq, NULL);
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}
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}
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static int __devinit tc35892_gpio_probe(struct platform_device *pdev)
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{
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struct tc35892 *tc35892 = dev_get_drvdata(pdev->dev.parent);
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struct tc35892_gpio_platform_data *pdata;
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struct tc35892_gpio *tc35892_gpio;
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int ret;
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int irq;
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pdata = tc35892->pdata->gpio;
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if (!pdata)
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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tc35892_gpio = kzalloc(sizeof(struct tc35892_gpio), GFP_KERNEL);
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if (!tc35892_gpio)
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return -ENOMEM;
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mutex_init(&tc35892_gpio->irq_lock);
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tc35892_gpio->dev = &pdev->dev;
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tc35892_gpio->tc35892 = tc35892;
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tc35892_gpio->chip = template_chip;
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tc35892_gpio->chip.ngpio = tc35892->num_gpio;
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tc35892_gpio->chip.dev = &pdev->dev;
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tc35892_gpio->chip.base = pdata->gpio_base;
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tc35892_gpio->irq_base = tc35892->irq_base + TC35892_INT_GPIO(0);
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/* Bring the GPIO module out of reset */
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ret = tc35892_set_bits(tc35892, TC35892_RSTCTRL,
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TC35892_RSTCTRL_GPIRST, 0);
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if (ret < 0)
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goto out_free;
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ret = tc35892_gpio_irq_init(tc35892_gpio);
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if (ret)
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goto out_free;
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ret = request_threaded_irq(irq, NULL, tc35892_gpio_irq, IRQF_ONESHOT,
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"tc35892-gpio", tc35892_gpio);
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if (ret) {
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dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
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goto out_removeirq;
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}
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ret = gpiochip_add(&tc35892_gpio->chip);
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if (ret) {
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dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
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goto out_freeirq;
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}
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platform_set_drvdata(pdev, tc35892_gpio);
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return 0;
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out_freeirq:
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free_irq(irq, tc35892_gpio);
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out_removeirq:
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tc35892_gpio_irq_remove(tc35892_gpio);
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out_free:
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kfree(tc35892_gpio);
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return ret;
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}
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static int __devexit tc35892_gpio_remove(struct platform_device *pdev)
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{
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struct tc35892_gpio *tc35892_gpio = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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int ret;
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ret = gpiochip_remove(&tc35892_gpio->chip);
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if (ret < 0) {
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dev_err(tc35892_gpio->dev,
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"unable to remove gpiochip: %d\n", ret);
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return ret;
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}
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free_irq(irq, tc35892_gpio);
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tc35892_gpio_irq_remove(tc35892_gpio);
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platform_set_drvdata(pdev, NULL);
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kfree(tc35892_gpio);
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return 0;
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}
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static struct platform_driver tc35892_gpio_driver = {
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.driver.name = "tc35892-gpio",
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.driver.owner = THIS_MODULE,
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.probe = tc35892_gpio_probe,
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.remove = __devexit_p(tc35892_gpio_remove),
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};
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static int __init tc35892_gpio_init(void)
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{
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return platform_driver_register(&tc35892_gpio_driver);
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}
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subsys_initcall(tc35892_gpio_init);
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static void __exit tc35892_gpio_exit(void)
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{
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platform_driver_unregister(&tc35892_gpio_driver);
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}
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module_exit(tc35892_gpio_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TC35892 GPIO driver");
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MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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