forked from Minki/linux
i2c: Add platform driver on top of the new pca-algorithm
Tested on a blackfin. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Wolfram Sang
Jean Delvare
parent
c01b083105
commit
244fbbb81c
@ -633,7 +633,7 @@ config I2C_PCA_ISA
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default n
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help
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This driver supports ISA boards using the Philips PCA9564
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Parallel bus to I2C bus controller
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parallel bus to I2C bus controller.
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This driver can also be built as a module. If so, the module
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will be called i2c-pca-isa.
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@ -643,6 +643,17 @@ config I2C_PCA_ISA
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delays when I2C/SMBus chip drivers are loaded (e.g. at boot
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time). If unsure, say N.
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config I2C_PCA_PLATFORM
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tristate "PCA9564 as platform device"
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select I2C_ALGOPCA
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default n
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help
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This driver supports a memory mapped Philips PCA9564
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parallel bus to I2C bus controller.
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This driver can also be built as a module. If so, the module
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will be called i2c-pca-platform.
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config I2C_MV64XXX
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tristate "Marvell mv64xxx I2C Controller"
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depends on (MV64X60 || PLAT_ORION) && EXPERIMENTAL
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@ -30,6 +30,7 @@ obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
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obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
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obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
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obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
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obj-$(CONFIG_I2C_PCA_PLATFORM) += i2c-pca-platform.o
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obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
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obj-$(CONFIG_I2C_PMCMSP) += i2c-pmcmsp.o
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obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
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298
drivers/i2c/busses/i2c-pca-platform.c
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298
drivers/i2c/busses/i2c-pca-platform.c
Normal file
@ -0,0 +1,298 @@
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/*
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* i2c_pca_platform.c
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*
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* Platform driver for the PCA9564 I2C controller.
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*
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* Copyright (C) 2008 Pengutronix
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/i2c.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-algo-pca.h>
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#include <linux/i2c-pca-platform.h>
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#include <linux/gpio.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#define res_len(r) ((r)->end - (r)->start + 1)
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struct i2c_pca_pf_data {
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void __iomem *reg_base;
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int irq; /* if 0, use polling */
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int gpio;
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wait_queue_head_t wait;
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struct i2c_adapter adap;
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struct i2c_algo_pca_data algo_data;
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unsigned long io_base;
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unsigned long io_size;
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};
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/* Read/Write functions for different register alignments */
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static int i2c_pca_pf_readbyte8(void *pd, int reg)
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{
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struct i2c_pca_pf_data *i2c = pd;
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return ioread8(i2c->reg_base + reg);
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}
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static int i2c_pca_pf_readbyte16(void *pd, int reg)
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{
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struct i2c_pca_pf_data *i2c = pd;
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return ioread8(i2c->reg_base + reg * 2);
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}
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static int i2c_pca_pf_readbyte32(void *pd, int reg)
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{
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struct i2c_pca_pf_data *i2c = pd;
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return ioread8(i2c->reg_base + reg * 4);
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}
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static void i2c_pca_pf_writebyte8(void *pd, int reg, int val)
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{
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struct i2c_pca_pf_data *i2c = pd;
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iowrite8(val, i2c->reg_base + reg);
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}
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static void i2c_pca_pf_writebyte16(void *pd, int reg, int val)
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{
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struct i2c_pca_pf_data *i2c = pd;
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iowrite8(val, i2c->reg_base + reg * 2);
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}
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static void i2c_pca_pf_writebyte32(void *pd, int reg, int val)
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{
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struct i2c_pca_pf_data *i2c = pd;
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iowrite8(val, i2c->reg_base + reg * 4);
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}
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static int i2c_pca_pf_waitforcompletion(void *pd)
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{
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struct i2c_pca_pf_data *i2c = pd;
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int ret = 0;
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if (i2c->irq) {
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ret = wait_event_interruptible(i2c->wait,
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i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
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& I2C_PCA_CON_SI);
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} else {
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/*
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* Do polling...
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* XXX: Could get stuck in extreme cases!
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* Maybe add timeout, but using irqs is preferred anyhow.
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*/
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while ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
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& I2C_PCA_CON_SI) == 0)
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udelay(100);
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}
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return ret;
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}
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static void i2c_pca_pf_dummyreset(void *pd)
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{
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struct i2c_pca_pf_data *i2c = pd;
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printk(KERN_WARNING "%s: No reset-pin found. Chip may get stuck!\n",
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i2c->adap.name);
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}
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static void i2c_pca_pf_resetchip(void *pd)
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{
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struct i2c_pca_pf_data *i2c = pd;
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gpio_set_value(i2c->gpio, 0);
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ndelay(100);
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gpio_set_value(i2c->gpio, 1);
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}
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static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id)
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{
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struct i2c_pca_pf_data *i2c = dev_id;
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if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
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return IRQ_NONE;
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wake_up_interruptible(&i2c->wait);
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return IRQ_HANDLED;
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}
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static int __devinit i2c_pca_pf_probe(struct platform_device *pdev)
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{
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struct i2c_pca_pf_data *i2c;
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struct resource *res;
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struct i2c_pca9564_pf_platform_data *platform_data =
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pdev->dev.platform_data;
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int ret = 0;
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int irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_irq(pdev, 0);
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/* If irq is 0, we do polling. */
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if (res == NULL) {
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ret = -ENODEV;
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goto e_print;
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}
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if (!request_mem_region(res->start, res_len(res), res->name)) {
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ret = -ENOMEM;
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goto e_print;
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}
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i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL);
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if (!i2c) {
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ret = -ENOMEM;
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goto e_alloc;
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}
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init_waitqueue_head(&i2c->wait);
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i2c->reg_base = ioremap(res->start, res_len(res));
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if (!i2c->reg_base) {
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ret = -EIO;
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goto e_remap;
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}
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i2c->io_base = res->start;
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i2c->io_size = res_len(res);
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i2c->irq = irq;
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i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
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i2c->adap.owner = THIS_MODULE;
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snprintf(i2c->adap.name, sizeof(i2c->adap.name), "PCA9564 at 0x%08lx",
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(unsigned long) res->start);
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i2c->adap.algo_data = &i2c->algo_data;
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i2c->adap.dev.parent = &pdev->dev;
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i2c->adap.timeout = platform_data->timeout;
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i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;
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i2c->algo_data.data = i2c;
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switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
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case IORESOURCE_MEM_32BIT:
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i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;
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i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;
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break;
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case IORESOURCE_MEM_16BIT:
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i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;
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i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;
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break;
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case IORESOURCE_MEM_8BIT:
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default:
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i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;
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i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;
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break;
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}
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i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;
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i2c->gpio = platform_data->gpio;
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i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;
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/* Use gpio_is_valid() when in mainline */
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if (i2c->gpio > -1) {
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ret = gpio_request(i2c->gpio, i2c->adap.name);
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if (ret == 0) {
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gpio_direction_output(i2c->gpio, 1);
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i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;
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} else {
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printk(KERN_WARNING "%s: Registering gpio failed!\n",
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i2c->adap.name);
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i2c->gpio = ret;
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}
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}
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if (irq) {
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ret = request_irq(irq, i2c_pca_pf_handler,
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IRQF_TRIGGER_FALLING, i2c->adap.name, i2c);
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if (ret)
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goto e_reqirq;
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}
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if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) {
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ret = -ENODEV;
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goto e_adapt;
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}
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platform_set_drvdata(pdev, i2c);
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printk(KERN_INFO "%s registered.\n", i2c->adap.name);
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return 0;
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e_adapt:
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if (irq)
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free_irq(irq, i2c);
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e_reqirq:
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if (i2c->gpio > -1)
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gpio_free(i2c->gpio);
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iounmap(i2c->reg_base);
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e_remap:
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kfree(i2c);
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e_alloc:
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release_mem_region(res->start, res_len(res));
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e_print:
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printk(KERN_ERR "Registering PCA9564 FAILED! (%d)\n", ret);
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return ret;
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}
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static int __devexit i2c_pca_pf_remove(struct platform_device *pdev)
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{
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struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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i2c_del_adapter(&i2c->adap);
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if (i2c->irq)
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free_irq(i2c->irq, i2c);
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if (i2c->gpio > -1)
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gpio_free(i2c->gpio);
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iounmap(i2c->reg_base);
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release_mem_region(i2c->io_base, i2c->io_size);
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kfree(i2c);
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return 0;
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}
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static struct platform_driver i2c_pca_pf_driver = {
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.probe = i2c_pca_pf_probe,
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.remove = __devexit_p(i2c_pca_pf_remove),
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.driver = {
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.name = "i2c-pca-platform",
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.owner = THIS_MODULE,
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},
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};
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static int __init i2c_pca_pf_init(void)
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{
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return platform_driver_register(&i2c_pca_pf_driver);
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}
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static void __exit i2c_pca_pf_exit(void)
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{
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platform_driver_unregister(&i2c_pca_pf_driver);
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}
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MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
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MODULE_DESCRIPTION("I2C-PCA9564 platform driver");
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MODULE_LICENSE("GPL");
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module_init(i2c_pca_pf_init);
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module_exit(i2c_pca_pf_exit);
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12
include/linux/i2c-pca-platform.h
Normal file
12
include/linux/i2c-pca-platform.h
Normal file
@ -0,0 +1,12 @@
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#ifndef I2C_PCA9564_PLATFORM_H
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#define I2C_PCA9564_PLATFORM_H
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struct i2c_pca9564_pf_platform_data {
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int gpio; /* pin to reset chip. driver will work when
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* not supplied (negative value), but it
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* cannot exit some error conditions then */
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int i2c_clock_speed; /* values are defined in linux/i2c-algo-pca.h */
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int timeout; /* timeout = this value * 10us */
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};
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#endif /* I2C_PCA9564_PLATFORM_H */
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