diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-pca-platform.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/busses/i2c-pca-platform.c | 293 |
1 files changed, 0 insertions, 293 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-pca-platform.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-pca-platform.c deleted file mode 100644 index 2adbf1a8..00000000 --- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-pca-platform.c +++ /dev/null @@ -1,293 +0,0 @@ -/* - * i2c_pca_platform.c - * - * Platform driver for the PCA9564 I2C controller. - * - * Copyright (C) 2008 Pengutronix - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/jiffies.h> -#include <linux/errno.h> -#include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/i2c-algo-pca.h> -#include <linux/i2c-pca-platform.h> -#include <linux/gpio.h> -#include <linux/io.h> - -#include <asm/irq.h> - -struct i2c_pca_pf_data { - void __iomem *reg_base; - int irq; /* if 0, use polling */ - int gpio; - wait_queue_head_t wait; - struct i2c_adapter adap; - struct i2c_algo_pca_data algo_data; - unsigned long io_base; - unsigned long io_size; -}; - -/* Read/Write functions for different register alignments */ - -static int i2c_pca_pf_readbyte8(void *pd, int reg) -{ - struct i2c_pca_pf_data *i2c = pd; - return ioread8(i2c->reg_base + reg); -} - -static int i2c_pca_pf_readbyte16(void *pd, int reg) -{ - struct i2c_pca_pf_data *i2c = pd; - return ioread8(i2c->reg_base + reg * 2); -} - -static int i2c_pca_pf_readbyte32(void *pd, int reg) -{ - struct i2c_pca_pf_data *i2c = pd; - return ioread8(i2c->reg_base + reg * 4); -} - -static void i2c_pca_pf_writebyte8(void *pd, int reg, int val) -{ - struct i2c_pca_pf_data *i2c = pd; - iowrite8(val, i2c->reg_base + reg); -} - -static void i2c_pca_pf_writebyte16(void *pd, int reg, int val) -{ - struct i2c_pca_pf_data *i2c = pd; - iowrite8(val, i2c->reg_base + reg * 2); -} - -static void i2c_pca_pf_writebyte32(void *pd, int reg, int val) -{ - struct i2c_pca_pf_data *i2c = pd; - iowrite8(val, i2c->reg_base + reg * 4); -} - - -static int i2c_pca_pf_waitforcompletion(void *pd) -{ - struct i2c_pca_pf_data *i2c = pd; - unsigned long timeout; - long ret; - - if (i2c->irq) { - ret = wait_event_timeout(i2c->wait, - i2c->algo_data.read_byte(i2c, I2C_PCA_CON) - & I2C_PCA_CON_SI, i2c->adap.timeout); - } else { - /* Do polling */ - timeout = jiffies + i2c->adap.timeout; - do { - ret = time_before(jiffies, timeout); - if (i2c->algo_data.read_byte(i2c, I2C_PCA_CON) - & I2C_PCA_CON_SI) - break; - udelay(100); - } while (ret); - } - - return ret > 0; -} - -static void i2c_pca_pf_dummyreset(void *pd) -{ - struct i2c_pca_pf_data *i2c = pd; - printk(KERN_WARNING "%s: No reset-pin found. Chip may get stuck!\n", - i2c->adap.name); -} - -static void i2c_pca_pf_resetchip(void *pd) -{ - struct i2c_pca_pf_data *i2c = pd; - - gpio_set_value(i2c->gpio, 0); - ndelay(100); - gpio_set_value(i2c->gpio, 1); -} - -static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id) -{ - struct i2c_pca_pf_data *i2c = dev_id; - - if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0) - return IRQ_NONE; - - wake_up(&i2c->wait); - - return IRQ_HANDLED; -} - - -static int __devinit i2c_pca_pf_probe(struct platform_device *pdev) -{ - struct i2c_pca_pf_data *i2c; - struct resource *res; - struct i2c_pca9564_pf_platform_data *platform_data = - pdev->dev.platform_data; - int ret = 0; - int irq; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - irq = platform_get_irq(pdev, 0); - /* If irq is 0, we do polling. */ - - if (res == NULL) { - ret = -ENODEV; - goto e_print; - } - - if (!request_mem_region(res->start, resource_size(res), res->name)) { - ret = -ENOMEM; - goto e_print; - } - - i2c = kzalloc(sizeof(struct i2c_pca_pf_data), GFP_KERNEL); - if (!i2c) { - ret = -ENOMEM; - goto e_alloc; - } - - init_waitqueue_head(&i2c->wait); - - i2c->reg_base = ioremap(res->start, resource_size(res)); - if (!i2c->reg_base) { - ret = -ENOMEM; - goto e_remap; - } - i2c->io_base = res->start; - i2c->io_size = resource_size(res); - i2c->irq = irq; - - i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0; - i2c->adap.owner = THIS_MODULE; - snprintf(i2c->adap.name, sizeof(i2c->adap.name), - "PCA9564/PCA9665 at 0x%08lx", - (unsigned long) res->start); - i2c->adap.algo_data = &i2c->algo_data; - i2c->adap.dev.parent = &pdev->dev; - - if (platform_data) { - i2c->adap.timeout = platform_data->timeout; - i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed; - i2c->gpio = platform_data->gpio; - } else { - i2c->adap.timeout = HZ; - i2c->algo_data.i2c_clock = 59000; - i2c->gpio = -1; - } - - i2c->algo_data.data = i2c; - i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion; - i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset; - - switch (res->flags & IORESOURCE_MEM_TYPE_MASK) { - case IORESOURCE_MEM_32BIT: - i2c->algo_data.write_byte = i2c_pca_pf_writebyte32; - i2c->algo_data.read_byte = i2c_pca_pf_readbyte32; - break; - case IORESOURCE_MEM_16BIT: - i2c->algo_data.write_byte = i2c_pca_pf_writebyte16; - i2c->algo_data.read_byte = i2c_pca_pf_readbyte16; - break; - case IORESOURCE_MEM_8BIT: - default: - i2c->algo_data.write_byte = i2c_pca_pf_writebyte8; - i2c->algo_data.read_byte = i2c_pca_pf_readbyte8; - break; - } - - /* Use gpio_is_valid() when in mainline */ - if (i2c->gpio > -1) { - ret = gpio_request(i2c->gpio, i2c->adap.name); - if (ret == 0) { - gpio_direction_output(i2c->gpio, 1); - i2c->algo_data.reset_chip = i2c_pca_pf_resetchip; - } else { - printk(KERN_WARNING "%s: Registering gpio failed!\n", - i2c->adap.name); - i2c->gpio = ret; - } - } - - if (irq) { - ret = request_irq(irq, i2c_pca_pf_handler, - IRQF_TRIGGER_FALLING, pdev->name, i2c); - if (ret) - goto e_reqirq; - } - - if (i2c_pca_add_numbered_bus(&i2c->adap) < 0) { - ret = -ENODEV; - goto e_adapt; - } - - platform_set_drvdata(pdev, i2c); - - printk(KERN_INFO "%s registered.\n", i2c->adap.name); - - return 0; - -e_adapt: - if (irq) - free_irq(irq, i2c); -e_reqirq: - if (i2c->gpio > -1) - gpio_free(i2c->gpio); - - iounmap(i2c->reg_base); -e_remap: - kfree(i2c); -e_alloc: - release_mem_region(res->start, resource_size(res)); -e_print: - printk(KERN_ERR "Registering PCA9564/PCA9665 FAILED! (%d)\n", ret); - return ret; -} - -static int __devexit i2c_pca_pf_remove(struct platform_device *pdev) -{ - struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev); - platform_set_drvdata(pdev, NULL); - - i2c_del_adapter(&i2c->adap); - - if (i2c->irq) - free_irq(i2c->irq, i2c); - - if (i2c->gpio > -1) - gpio_free(i2c->gpio); - - iounmap(i2c->reg_base); - release_mem_region(i2c->io_base, i2c->io_size); - kfree(i2c); - - return 0; -} - -static struct platform_driver i2c_pca_pf_driver = { - .probe = i2c_pca_pf_probe, - .remove = __devexit_p(i2c_pca_pf_remove), - .driver = { - .name = "i2c-pca-platform", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(i2c_pca_pf_driver); - -MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); -MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver"); -MODULE_LICENSE("GPL"); |