![Libo Chen](/assets/img/avatar_default.png)
when request_irq fails, we should release gpiochip v2: fix warning: ignoring return value of 'gpiochip_remove Signed-off-by: Libo Chen <libo.chen@huawei.com> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
333 lines
8.2 KiB
C
333 lines
8.2 KiB
C
/* Moorestown PMIC GPIO (access through IPC) driver
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* Copyright (c) 2008 - 2009, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Supports:
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* Moorestown platform PMIC chip
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/stddef.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <asm/intel_scu_ipc.h>
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#include <linux/device.h>
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#include <linux/intel_pmic_gpio.h>
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#include <linux/platform_device.h>
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#define DRIVER_NAME "pmic_gpio"
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/* register offset that IPC driver should use
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* 8 GPIO + 8 GPOSW (6 controllable) + 8GPO
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*/
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enum pmic_gpio_register {
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GPIO0 = 0xE0,
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GPIO7 = 0xE7,
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GPIOINT = 0xE8,
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GPOSWCTL0 = 0xEC,
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GPOSWCTL5 = 0xF1,
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GPO = 0xF4,
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};
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/* bits definition for GPIO & GPOSW */
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#define GPIO_DRV 0x01
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#define GPIO_DIR 0x02
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#define GPIO_DIN 0x04
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#define GPIO_DOU 0x08
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#define GPIO_INTCTL 0x30
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#define GPIO_DBC 0xc0
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#define GPOSW_DRV 0x01
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#define GPOSW_DOU 0x08
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#define GPOSW_RDRV 0x30
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#define GPIO_UPDATE_TYPE 0x80000000
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#define NUM_GPIO 24
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struct pmic_gpio {
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struct mutex buslock;
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struct gpio_chip chip;
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void *gpiointr;
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int irq;
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unsigned irq_base;
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unsigned int update_type;
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u32 trigger_type;
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};
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static void pmic_program_irqtype(int gpio, int type)
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{
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if (type & IRQ_TYPE_EDGE_RISING)
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intel_scu_ipc_update_register(GPIO0 + gpio, 0x20, 0x20);
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else
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intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x20);
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if (type & IRQ_TYPE_EDGE_FALLING)
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intel_scu_ipc_update_register(GPIO0 + gpio, 0x10, 0x10);
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else
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intel_scu_ipc_update_register(GPIO0 + gpio, 0x00, 0x10);
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};
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static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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if (offset > 8) {
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pr_err("only pin 0-7 support input\n");
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return -1;/* we only have 8 GPIO can use as input */
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}
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return intel_scu_ipc_update_register(GPIO0 + offset,
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GPIO_DIR, GPIO_DIR);
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}
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static int pmic_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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int rc = 0;
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if (offset < 8)/* it is GPIO */
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rc = intel_scu_ipc_update_register(GPIO0 + offset,
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GPIO_DRV | (value ? GPIO_DOU : 0),
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GPIO_DRV | GPIO_DOU | GPIO_DIR);
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else if (offset < 16)/* it is GPOSW */
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rc = intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
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GPOSW_DRV | (value ? GPOSW_DOU : 0),
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GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV);
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else if (offset > 15 && offset < 24)/* it is GPO */
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rc = intel_scu_ipc_update_register(GPO,
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value ? 1 << (offset - 16) : 0,
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1 << (offset - 16));
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else {
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pr_err("invalid PMIC GPIO pin %d!\n", offset);
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WARN_ON(1);
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}
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return rc;
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}
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static int pmic_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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u8 r;
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int ret;
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/* we only have 8 GPIO pins we can use as input */
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if (offset > 8)
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return -EOPNOTSUPP;
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ret = intel_scu_ipc_ioread8(GPIO0 + offset, &r);
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if (ret < 0)
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return ret;
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return r & GPIO_DIN;
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}
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static void pmic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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if (offset < 8)/* it is GPIO */
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intel_scu_ipc_update_register(GPIO0 + offset,
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GPIO_DRV | (value ? GPIO_DOU : 0),
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GPIO_DRV | GPIO_DOU);
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else if (offset < 16)/* it is GPOSW */
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intel_scu_ipc_update_register(GPOSWCTL0 + offset - 8,
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GPOSW_DRV | (value ? GPOSW_DOU : 0),
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GPOSW_DRV | GPOSW_DOU | GPOSW_RDRV);
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else if (offset > 15 && offset < 24) /* it is GPO */
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intel_scu_ipc_update_register(GPO,
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value ? 1 << (offset - 16) : 0,
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1 << (offset - 16));
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}
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/*
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* This is called from genirq with pg->buslock locked and
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* irq_desc->lock held. We can not access the scu bus here, so we
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* store the change and update in the bus_sync_unlock() function below
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*/
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static int pmic_irq_type(struct irq_data *data, unsigned type)
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{
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struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
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u32 gpio = data->irq - pg->irq_base;
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if (gpio >= pg->chip.ngpio)
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return -EINVAL;
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pg->trigger_type = type;
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pg->update_type = gpio | GPIO_UPDATE_TYPE;
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return 0;
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}
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static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct pmic_gpio *pg = container_of(chip, struct pmic_gpio, chip);
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return pg->irq_base + offset;
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}
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static void pmic_bus_lock(struct irq_data *data)
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{
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struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
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mutex_lock(&pg->buslock);
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}
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static void pmic_bus_sync_unlock(struct irq_data *data)
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{
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struct pmic_gpio *pg = irq_data_get_irq_chip_data(data);
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if (pg->update_type) {
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unsigned int gpio = pg->update_type & ~GPIO_UPDATE_TYPE;
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pmic_program_irqtype(gpio, pg->trigger_type);
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pg->update_type = 0;
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}
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mutex_unlock(&pg->buslock);
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}
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/* the gpiointr register is read-clear, so just do nothing. */
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static void pmic_irq_unmask(struct irq_data *data) { }
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static void pmic_irq_mask(struct irq_data *data) { }
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static struct irq_chip pmic_irqchip = {
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.name = "PMIC-GPIO",
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.irq_mask = pmic_irq_mask,
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.irq_unmask = pmic_irq_unmask,
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.irq_set_type = pmic_irq_type,
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.irq_bus_lock = pmic_bus_lock,
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.irq_bus_sync_unlock = pmic_bus_sync_unlock,
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};
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static irqreturn_t pmic_irq_handler(int irq, void *data)
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{
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struct pmic_gpio *pg = data;
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u8 intsts = *((u8 *)pg->gpiointr + 4);
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int gpio;
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irqreturn_t ret = IRQ_NONE;
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for (gpio = 0; gpio < 8; gpio++) {
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if (intsts & (1 << gpio)) {
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pr_debug("pmic pin %d triggered\n", gpio);
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generic_handle_irq(pg->irq_base + gpio);
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ret = IRQ_HANDLED;
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}
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}
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return ret;
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}
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static int platform_pmic_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int irq = platform_get_irq(pdev, 0);
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struct intel_pmic_gpio_platform_data *pdata = dev->platform_data;
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struct pmic_gpio *pg;
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int retval;
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int i;
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if (irq < 0) {
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dev_dbg(dev, "no IRQ line\n");
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return -EINVAL;
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}
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if (!pdata || !pdata->gpio_base || !pdata->irq_base) {
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dev_dbg(dev, "incorrect or missing platform data\n");
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return -EINVAL;
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}
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pg = kzalloc(sizeof(*pg), GFP_KERNEL);
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if (!pg)
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return -ENOMEM;
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dev_set_drvdata(dev, pg);
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pg->irq = irq;
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/* setting up SRAM mapping for GPIOINT register */
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pg->gpiointr = ioremap_nocache(pdata->gpiointr, 8);
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if (!pg->gpiointr) {
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pr_err("Can not map GPIOINT\n");
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retval = -EINVAL;
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goto err2;
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}
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pg->irq_base = pdata->irq_base;
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pg->chip.label = "intel_pmic";
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pg->chip.direction_input = pmic_gpio_direction_input;
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pg->chip.direction_output = pmic_gpio_direction_output;
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pg->chip.get = pmic_gpio_get;
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pg->chip.set = pmic_gpio_set;
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pg->chip.to_irq = pmic_gpio_to_irq;
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pg->chip.base = pdata->gpio_base;
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pg->chip.ngpio = NUM_GPIO;
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pg->chip.can_sleep = 1;
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pg->chip.dev = dev;
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mutex_init(&pg->buslock);
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pg->chip.dev = dev;
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retval = gpiochip_add(&pg->chip);
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if (retval) {
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pr_err("Can not add pmic gpio chip\n");
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goto err;
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}
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retval = request_irq(pg->irq, pmic_irq_handler, 0, "pmic", pg);
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if (retval) {
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pr_warn("Interrupt request failed\n");
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goto fail_request_irq;
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}
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for (i = 0; i < 8; i++) {
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irq_set_chip_and_handler_name(i + pg->irq_base,
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&pmic_irqchip,
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handle_simple_irq,
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"demux");
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irq_set_chip_data(i + pg->irq_base, pg);
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}
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return 0;
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fail_request_irq:
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if (gpiochip_remove(&pg->chip))
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pr_err("gpiochip_remove failed\n");
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err:
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iounmap(pg->gpiointr);
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err2:
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kfree(pg);
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return retval;
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}
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/* at the same time, register a platform driver
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* this supports the sfi 0.81 fw */
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static struct platform_driver platform_pmic_gpio_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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.probe = platform_pmic_gpio_probe,
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};
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static int __init platform_pmic_gpio_init(void)
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{
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return platform_driver_register(&platform_pmic_gpio_driver);
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}
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subsys_initcall(platform_pmic_gpio_init);
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MODULE_AUTHOR("Alek Du <alek.du@intel.com>");
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MODULE_DESCRIPTION("Intel Moorestown PMIC GPIO driver");
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MODULE_LICENSE("GPL v2");
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