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mfd: Add HTCPLD driver
This change introduces a driver for the HTC PLD chip found on some smartphones, such as the HTC Wizard and HTC Herald. It works through the I2C bus and acts as a GPIO extender. Specifically: * it can have several sub-devices, each with its own I2C address * Each sub-device provides 8 output and 8 input pins * The chip attaches to one GPIO to signal when any of the input GPIOs change -- at which point all chips must be scanned for changes This driver implements the GPIOs throught the kernel's GPIO and IRQ framework. This allows any GPIO-servicing drivers to operate on htcpld pins, such as the gpio-keys and gpio-leds drivers. Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Cory Maccarrone
Samuel Ortiz
parent
08ff6f2a99
commit
6048a3dd23
4 changed files with 744 additions and 0 deletions
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@ -78,6 +78,15 @@ config HTC_PASIC3
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HTC Magician devices, respectively. Actual functionality is
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handled by the leds-pasic3 and ds1wm drivers.
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config HTC_I2CPLD
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bool "HTC I2C PLD chip support"
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depends on I2C=y
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help
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If you say yes here you get support for the supposed CPLD
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found on omap850 HTC devices like the HTC Wizard and HTC Herald.
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This device provides input and output GPIOs through an I2C
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interface to one or more sub-chips.
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config UCB1400_CORE
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tristate "Philips UCB1400 Core driver"
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depends on AC97_BUS
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@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_SH_MOBILE_SDHI) += sh_mobile_sdhi.o
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obj-$(CONFIG_HTC_EGPIO) += htc-egpio.o
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obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
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obj-$(CONFIG_HTC_I2CPLD) += htc-i2cpld.o
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obj-$(CONFIG_MFD_DM355EVM_MSP) += dm355evm_msp.o
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710
drivers/mfd/htc-i2cpld.c
Normal file
710
drivers/mfd/htc-i2cpld.c
Normal file
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@ -0,0 +1,710 @@
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/*
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* htc-i2cpld.c
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* Chip driver for an unknown CPLD chip found on omap850 HTC devices like
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* the HTC Wizard and HTC Herald.
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* The cpld is located on the i2c bus and acts as an input/output GPIO
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* extender.
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*
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* Copyright (C) 2009 Cory Maccarrone <darkstar6262@gmail.com>
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*
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* Based on work done in the linwizard project
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* Copyright (C) 2008-2009 Angelo Arrifano <miknix@gmail.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/htcpld.h>
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#include <linux/gpio.h>
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struct htcpld_chip {
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spinlock_t lock;
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/* chip info */
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u8 reset;
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u8 addr;
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struct device *dev;
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struct i2c_client *client;
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/* Output details */
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u8 cache_out;
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struct gpio_chip chip_out;
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/* Input details */
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u8 cache_in;
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struct gpio_chip chip_in;
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u16 irqs_enabled;
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uint irq_start;
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int nirqs;
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/*
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* Work structure to allow for setting values outside of any
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* possible interrupt context
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*/
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struct work_struct set_val_work;
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};
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struct htcpld_data {
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/* irq info */
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u16 irqs_enabled;
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uint irq_start;
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int nirqs;
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uint chained_irq;
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unsigned int int_reset_gpio_hi;
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unsigned int int_reset_gpio_lo;
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/* htcpld info */
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struct htcpld_chip *chip;
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unsigned int nchips;
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};
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/* There does not appear to be a way to proactively mask interrupts
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* on the htcpld chip itself. So, we simply ignore interrupts that
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* aren't desired. */
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static void htcpld_mask(unsigned int irq)
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{
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struct htcpld_chip *chip = get_irq_chip_data(irq);
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chip->irqs_enabled &= ~(1 << (irq - chip->irq_start));
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pr_debug("HTCPLD mask %d %04x\n", irq, chip->irqs_enabled);
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}
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static void htcpld_unmask(unsigned int irq)
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{
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struct htcpld_chip *chip = get_irq_chip_data(irq);
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chip->irqs_enabled |= 1 << (irq - chip->irq_start);
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pr_debug("HTCPLD unmask %d %04x\n", irq, chip->irqs_enabled);
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}
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static int htcpld_set_type(unsigned int irq, unsigned int flags)
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{
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struct irq_desc *d = irq_to_desc(irq);
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if (!d) {
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pr_err("HTCPLD invalid IRQ: %d\n", irq);
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return -EINVAL;
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}
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if (flags & ~IRQ_TYPE_SENSE_MASK)
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return -EINVAL;
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/* We only allow edge triggering */
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if (flags & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))
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return -EINVAL;
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d->status &= ~IRQ_TYPE_SENSE_MASK;
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d->status |= flags;
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return 0;
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}
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static struct irq_chip htcpld_muxed_chip = {
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.name = "htcpld",
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.mask = htcpld_mask,
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.unmask = htcpld_unmask,
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.set_type = htcpld_set_type,
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};
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/* To properly dispatch IRQ events, we need to read from the
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* chip. This is an I2C action that could possibly sleep
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* (which is bad in interrupt context) -- so we use a threaded
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* interrupt handler to get around that.
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*/
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static irqreturn_t htcpld_handler(int irq, void *dev)
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{
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struct htcpld_data *htcpld = dev;
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unsigned int i;
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unsigned long flags;
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int irqpin;
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struct irq_desc *desc;
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if (!htcpld) {
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pr_debug("htcpld is null in ISR\n");
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return IRQ_HANDLED;
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}
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/*
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* For each chip, do a read of the chip and trigger any interrupts
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* desired. The interrupts will be triggered from LSB to MSB (i.e.
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* bit 0 first, then bit 1, etc.)
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*
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* For chips that have no interrupt range specified, just skip 'em.
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*/
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for (i = 0; i < htcpld->nchips; i++) {
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struct htcpld_chip *chip = &htcpld->chip[i];
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struct i2c_client *client;
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int val;
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unsigned long uval, old_val;
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if (!chip) {
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pr_debug("chip %d is null in ISR\n", i);
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continue;
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}
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if (chip->nirqs == 0)
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continue;
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client = chip->client;
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if (!client) {
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pr_debug("client %d is null in ISR\n", i);
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continue;
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}
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/* Scan the chip */
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val = i2c_smbus_read_byte_data(client, chip->cache_out);
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if (val < 0) {
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/* Throw a warning and skip this chip */
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dev_warn(chip->dev, "Unable to read from chip: %d\n",
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val);
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continue;
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}
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uval = (unsigned long)val;
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spin_lock_irqsave(&chip->lock, flags);
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/* Save away the old value so we can compare it */
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old_val = chip->cache_in;
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/* Write the new value */
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chip->cache_in = uval;
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spin_unlock_irqrestore(&chip->lock, flags);
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/*
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* For each bit in the data (starting at bit 0), trigger
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* associated interrupts.
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*/
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for (irqpin = 0; irqpin < chip->nirqs; irqpin++) {
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unsigned oldb, newb;
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int flags;
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irq = chip->irq_start + irqpin;
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desc = irq_to_desc(irq);
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flags = desc->status;
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/* Run the IRQ handler, but only if the bit value
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* changed, and the proper flags are set */
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oldb = (old_val >> irqpin) & 1;
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newb = (uval >> irqpin) & 1;
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if ((!oldb && newb && (flags & IRQ_TYPE_EDGE_RISING)) ||
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(oldb && !newb &&
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(flags & IRQ_TYPE_EDGE_FALLING))) {
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pr_debug("fire IRQ %d\n", irqpin);
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desc->handle_irq(irq, desc);
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}
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}
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}
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/*
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* In order to continue receiving interrupts, the int_reset_gpio must
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* be asserted.
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*/
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if (htcpld->int_reset_gpio_hi)
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gpio_set_value(htcpld->int_reset_gpio_hi, 1);
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if (htcpld->int_reset_gpio_lo)
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gpio_set_value(htcpld->int_reset_gpio_lo, 0);
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return IRQ_HANDLED;
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}
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/*
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* The GPIO set routines can be called from interrupt context, especially if,
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* for example they're attached to the led-gpio framework and a trigger is
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* enabled. As such, we declared work above in the htcpld_chip structure,
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* and that work is scheduled in the set routine. The kernel can then run
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* the I2C functions, which will sleep, in process context.
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*/
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void htcpld_chip_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct i2c_client *client;
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struct htcpld_chip *chip_data;
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unsigned long flags;
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chip_data = container_of(chip, struct htcpld_chip, chip_out);
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if (!chip_data)
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return;
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client = chip_data->client;
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if (client == NULL)
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return;
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spin_lock_irqsave(&chip_data->lock, flags);
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if (val)
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chip_data->cache_out |= (1 << offset);
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else
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chip_data->cache_out &= ~(1 << offset);
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spin_unlock_irqrestore(&chip_data->lock, flags);
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schedule_work(&(chip_data->set_val_work));
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}
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void htcpld_chip_set_ni(struct work_struct *work)
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{
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struct htcpld_chip *chip_data;
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struct i2c_client *client;
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chip_data = container_of(work, struct htcpld_chip, set_val_work);
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client = chip_data->client;
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i2c_smbus_read_byte_data(client, chip_data->cache_out);
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}
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int htcpld_chip_get(struct gpio_chip *chip, unsigned offset)
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{
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struct htcpld_chip *chip_data;
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int val = 0;
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int is_input = 0;
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/* Try out first */
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chip_data = container_of(chip, struct htcpld_chip, chip_out);
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if (!chip_data) {
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/* Try in */
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is_input = 1;
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chip_data = container_of(chip, struct htcpld_chip, chip_in);
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if (!chip_data)
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return -EINVAL;
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}
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/* Determine if this is an input or output GPIO */
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if (!is_input)
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/* Use the output cache */
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val = (chip_data->cache_out >> offset) & 1;
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else
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/* Use the input cache */
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val = (chip_data->cache_in >> offset) & 1;
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if (val)
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return 1;
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else
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return 0;
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}
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static int htcpld_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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htcpld_chip_set(chip, offset, value);
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return 0;
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}
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static int htcpld_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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/*
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* No-op: this function can only be called on the input chip.
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* We do however make sure the offset is within range.
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*/
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return (offset < chip->ngpio) ? 0 : -EINVAL;
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}
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int htcpld_chip_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct htcpld_chip *chip_data;
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chip_data = container_of(chip, struct htcpld_chip, chip_in);
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if (offset < chip_data->nirqs)
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return chip_data->irq_start + offset;
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else
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return -EINVAL;
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}
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void htcpld_chip_reset(struct i2c_client *client)
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{
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struct htcpld_chip *chip_data = i2c_get_clientdata(client);
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if (!chip_data)
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return;
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i2c_smbus_read_byte_data(
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client, (chip_data->cache_out = chip_data->reset));
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}
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static int __devinit htcpld_setup_chip_irq(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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struct htcpld_chip *chip;
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struct htcpld_chip_platform_data *plat_chip_data;
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unsigned int irq, irq_end;
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int ret = 0;
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/* Get the platform and driver data */
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pdata = dev->platform_data;
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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plat_chip_data = &pdata->chip[chip_index];
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/* Setup irq handlers */
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irq_end = chip->irq_start + chip->nirqs;
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for (irq = chip->irq_start; irq < irq_end; irq++) {
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set_irq_chip(irq, &htcpld_muxed_chip);
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set_irq_chip_data(irq, chip);
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set_irq_handler(irq, handle_simple_irq);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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#else
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set_irq_probe(irq);
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#endif
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}
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return ret;
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}
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static int __devinit htcpld_register_chip_i2c(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct device *dev = &pdev->dev;
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struct htcpld_core_platform_data *pdata;
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struct htcpld_chip *chip;
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struct htcpld_chip_platform_data *plat_chip_data;
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struct i2c_adapter *adapter;
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struct i2c_client *client;
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struct i2c_board_info info;
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/* Get the platform and driver data */
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pdata = dev->platform_data;
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htcpld = platform_get_drvdata(pdev);
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chip = &htcpld->chip[chip_index];
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plat_chip_data = &pdata->chip[chip_index];
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adapter = i2c_get_adapter(pdata->i2c_adapter_id);
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if (adapter == NULL) {
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/* Eek, no such I2C adapter! Bail out. */
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dev_warn(dev, "Chip at i2c address 0x%x: Invalid i2c adapter %d\n",
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plat_chip_data->addr, pdata->i2c_adapter_id);
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return -ENODEV;
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}
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
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dev_warn(dev, "i2c adapter %d non-functional\n",
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pdata->i2c_adapter_id);
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return -EINVAL;
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}
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memset(&info, 0, sizeof(struct i2c_board_info));
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info.addr = plat_chip_data->addr;
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strlcpy(info.type, "htcpld-chip", I2C_NAME_SIZE);
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info.platform_data = chip;
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/* Add the I2C device. This calls the probe() function. */
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client = i2c_new_device(adapter, &info);
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if (!client) {
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/* I2C device registration failed, contineu with the next */
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dev_warn(dev, "Unable to add I2C device for 0x%x\n",
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plat_chip_data->addr);
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return -ENODEV;
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}
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i2c_set_clientdata(client, chip);
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snprintf(client->name, I2C_NAME_SIZE, "Chip_0x%d", client->addr);
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chip->client = client;
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/* Reset the chip */
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htcpld_chip_reset(client);
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chip->cache_in = i2c_smbus_read_byte_data(client, chip->cache_out);
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return 0;
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}
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static void __devinit htcpld_unregister_chip_i2c(
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struct platform_device *pdev,
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int chip_index)
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{
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struct htcpld_data *htcpld;
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struct htcpld_chip *chip;
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||||
|
||||
/* Get the platform and driver data */
|
||||
htcpld = platform_get_drvdata(pdev);
|
||||
chip = &htcpld->chip[chip_index];
|
||||
|
||||
if (chip->client)
|
||||
i2c_unregister_device(chip->client);
|
||||
}
|
||||
|
||||
static int __devinit htcpld_register_chip_gpio(
|
||||
struct platform_device *pdev,
|
||||
int chip_index)
|
||||
{
|
||||
struct htcpld_data *htcpld;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct htcpld_core_platform_data *pdata;
|
||||
struct htcpld_chip *chip;
|
||||
struct htcpld_chip_platform_data *plat_chip_data;
|
||||
struct gpio_chip *gpio_chip;
|
||||
int ret = 0;
|
||||
|
||||
/* Get the platform and driver data */
|
||||
pdata = dev->platform_data;
|
||||
htcpld = platform_get_drvdata(pdev);
|
||||
chip = &htcpld->chip[chip_index];
|
||||
plat_chip_data = &pdata->chip[chip_index];
|
||||
|
||||
/* Setup the GPIO chips */
|
||||
gpio_chip = &(chip->chip_out);
|
||||
gpio_chip->label = "htcpld-out";
|
||||
gpio_chip->dev = dev;
|
||||
gpio_chip->owner = THIS_MODULE;
|
||||
gpio_chip->get = htcpld_chip_get;
|
||||
gpio_chip->set = htcpld_chip_set;
|
||||
gpio_chip->direction_input = NULL;
|
||||
gpio_chip->direction_output = htcpld_direction_output;
|
||||
gpio_chip->base = plat_chip_data->gpio_out_base;
|
||||
gpio_chip->ngpio = plat_chip_data->num_gpios;
|
||||
|
||||
gpio_chip = &(chip->chip_in);
|
||||
gpio_chip->label = "htcpld-in";
|
||||
gpio_chip->dev = dev;
|
||||
gpio_chip->owner = THIS_MODULE;
|
||||
gpio_chip->get = htcpld_chip_get;
|
||||
gpio_chip->set = NULL;
|
||||
gpio_chip->direction_input = htcpld_direction_input;
|
||||
gpio_chip->direction_output = NULL;
|
||||
gpio_chip->to_irq = htcpld_chip_to_irq;
|
||||
gpio_chip->base = plat_chip_data->gpio_in_base;
|
||||
gpio_chip->ngpio = plat_chip_data->num_gpios;
|
||||
|
||||
/* Add the GPIO chips */
|
||||
ret = gpiochip_add(&(chip->chip_out));
|
||||
if (ret) {
|
||||
dev_warn(dev, "Unable to register output GPIOs for 0x%x: %d\n",
|
||||
plat_chip_data->addr, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = gpiochip_add(&(chip->chip_in));
|
||||
if (ret) {
|
||||
int error;
|
||||
|
||||
dev_warn(dev, "Unable to register input GPIOs for 0x%x: %d\n",
|
||||
plat_chip_data->addr, ret);
|
||||
|
||||
error = gpiochip_remove(&(chip->chip_out));
|
||||
if (error)
|
||||
dev_warn(dev, "Error while trying to unregister gpio chip: %d\n", error);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit htcpld_setup_chips(struct platform_device *pdev)
|
||||
{
|
||||
struct htcpld_data *htcpld;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct htcpld_core_platform_data *pdata;
|
||||
int i;
|
||||
|
||||
/* Get the platform and driver data */
|
||||
pdata = dev->platform_data;
|
||||
htcpld = platform_get_drvdata(pdev);
|
||||
|
||||
/* Setup each chip's output GPIOs */
|
||||
htcpld->nchips = pdata->num_chip;
|
||||
htcpld->chip = kzalloc(sizeof(struct htcpld_chip) * htcpld->nchips,
|
||||
GFP_KERNEL);
|
||||
if (!htcpld->chip) {
|
||||
dev_warn(dev, "Unable to allocate memory for chips\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Add the chips as best we can */
|
||||
for (i = 0; i < htcpld->nchips; i++) {
|
||||
int ret;
|
||||
|
||||
/* Setup the HTCPLD chips */
|
||||
htcpld->chip[i].reset = pdata->chip[i].reset;
|
||||
htcpld->chip[i].cache_out = pdata->chip[i].reset;
|
||||
htcpld->chip[i].cache_in = 0;
|
||||
htcpld->chip[i].dev = dev;
|
||||
htcpld->chip[i].irq_start = pdata->chip[i].irq_base;
|
||||
htcpld->chip[i].nirqs = pdata->chip[i].num_irqs;
|
||||
|
||||
INIT_WORK(&(htcpld->chip[i].set_val_work), &htcpld_chip_set_ni);
|
||||
spin_lock_init(&(htcpld->chip[i].lock));
|
||||
|
||||
/* Setup the interrupts for the chip */
|
||||
if (htcpld->chained_irq) {
|
||||
ret = htcpld_setup_chip_irq(pdev, i);
|
||||
if (ret)
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Register the chip with I2C */
|
||||
ret = htcpld_register_chip_i2c(pdev, i);
|
||||
if (ret)
|
||||
continue;
|
||||
|
||||
|
||||
/* Register the chips with the GPIO subsystem */
|
||||
ret = htcpld_register_chip_gpio(pdev, i);
|
||||
if (ret) {
|
||||
/* Unregister the chip from i2c and continue */
|
||||
htcpld_unregister_chip_i2c(pdev, i);
|
||||
continue;
|
||||
}
|
||||
|
||||
dev_info(dev, "Registered chip at 0x%x\n", pdata->chip[i].addr);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit htcpld_core_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct htcpld_data *htcpld;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct htcpld_core_platform_data *pdata;
|
||||
struct resource *res;
|
||||
int ret = 0;
|
||||
|
||||
if (!dev)
|
||||
return -ENODEV;
|
||||
|
||||
pdata = dev->platform_data;
|
||||
if (!pdata) {
|
||||
dev_warn(dev, "Platform data not found for htcpld core!\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
htcpld = kzalloc(sizeof(struct htcpld_data), GFP_KERNEL);
|
||||
if (!htcpld)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Find chained irq */
|
||||
ret = -EINVAL;
|
||||
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
||||
if (res) {
|
||||
int flags;
|
||||
htcpld->chained_irq = res->start;
|
||||
|
||||
/* Setup the chained interrupt handler */
|
||||
flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
|
||||
ret = request_threaded_irq(htcpld->chained_irq,
|
||||
NULL, htcpld_handler,
|
||||
flags, pdev->name, htcpld);
|
||||
if (ret) {
|
||||
dev_warn(dev, "Unable to setup chained irq handler: %d\n", ret);
|
||||
goto fail;
|
||||
} else
|
||||
device_init_wakeup(dev, 0);
|
||||
}
|
||||
|
||||
/* Set the driver data */
|
||||
platform_set_drvdata(pdev, htcpld);
|
||||
|
||||
/* Setup the htcpld chips */
|
||||
ret = htcpld_setup_chips(pdev);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
/* Request the GPIO(s) for the int reset and set them up */
|
||||
if (pdata->int_reset_gpio_hi) {
|
||||
ret = gpio_request(pdata->int_reset_gpio_hi, "htcpld-core");
|
||||
if (ret) {
|
||||
/*
|
||||
* If it failed, that sucks, but we can probably
|
||||
* continue on without it.
|
||||
*/
|
||||
dev_warn(dev, "Unable to request int_reset_gpio_hi -- interrupts may not work\n");
|
||||
htcpld->int_reset_gpio_hi = 0;
|
||||
} else {
|
||||
htcpld->int_reset_gpio_hi = pdata->int_reset_gpio_hi;
|
||||
gpio_set_value(htcpld->int_reset_gpio_hi, 1);
|
||||
}
|
||||
}
|
||||
|
||||
if (pdata->int_reset_gpio_lo) {
|
||||
ret = gpio_request(pdata->int_reset_gpio_lo, "htcpld-core");
|
||||
if (ret) {
|
||||
/*
|
||||
* If it failed, that sucks, but we can probably
|
||||
* continue on without it.
|
||||
*/
|
||||
dev_warn(dev, "Unable to request int_reset_gpio_lo -- interrupts may not work\n");
|
||||
htcpld->int_reset_gpio_lo = 0;
|
||||
} else {
|
||||
htcpld->int_reset_gpio_lo = pdata->int_reset_gpio_lo;
|
||||
gpio_set_value(htcpld->int_reset_gpio_lo, 0);
|
||||
}
|
||||
}
|
||||
|
||||
dev_info(dev, "Initialized successfully\n");
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
kfree(htcpld);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* The I2C Driver -- used internally */
|
||||
static const struct i2c_device_id htcpld_chip_id[] = {
|
||||
{ "htcpld-chip", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, htcpld_chip_id);
|
||||
|
||||
|
||||
static struct i2c_driver htcpld_chip_driver = {
|
||||
.driver = {
|
||||
.name = "htcpld-chip",
|
||||
},
|
||||
.id_table = htcpld_chip_id,
|
||||
};
|
||||
|
||||
/* The Core Driver */
|
||||
static struct platform_driver htcpld_core_driver = {
|
||||
.driver = {
|
||||
.name = "i2c-htcpld",
|
||||
},
|
||||
};
|
||||
|
||||
static int __init htcpld_core_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Register the I2C Chip driver */
|
||||
ret = i2c_add_driver(&htcpld_chip_driver);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Probe for our chips */
|
||||
return platform_driver_probe(&htcpld_core_driver, htcpld_core_probe);
|
||||
}
|
||||
|
||||
static void __exit htcpld_core_exit(void)
|
||||
{
|
||||
i2c_del_driver(&htcpld_chip_driver);
|
||||
platform_driver_unregister(&htcpld_core_driver);
|
||||
}
|
||||
|
||||
module_init(htcpld_core_init);
|
||||
module_exit(htcpld_core_exit);
|
||||
|
||||
MODULE_AUTHOR("Cory Maccarrone <darkstar6262@gmail.com>");
|
||||
MODULE_DESCRIPTION("I2C HTC PLD Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
24
include/linux/htcpld.h
Normal file
24
include/linux/htcpld.h
Normal file
|
|
@ -0,0 +1,24 @@
|
|||
#ifndef __LINUX_HTCPLD_H
|
||||
#define __LINUX_HTCPLD_H
|
||||
|
||||
struct htcpld_chip_platform_data {
|
||||
unsigned int addr;
|
||||
unsigned int reset;
|
||||
unsigned int num_gpios;
|
||||
unsigned int gpio_out_base;
|
||||
unsigned int gpio_in_base;
|
||||
unsigned int irq_base;
|
||||
unsigned int num_irqs;
|
||||
};
|
||||
|
||||
struct htcpld_core_platform_data {
|
||||
unsigned int int_reset_gpio_hi;
|
||||
unsigned int int_reset_gpio_lo;
|
||||
unsigned int i2c_adapter_id;
|
||||
|
||||
struct htcpld_chip_platform_data *chip;
|
||||
unsigned int num_chip;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_HTCPLD_H */
|
||||
|
||||
Loading…
Reference in a new issue