diff options
Diffstat (limited to 'drivers/staging/cg2900/devices-cg2900-u8500.c')
| -rw-r--r-- | drivers/staging/cg2900/devices-cg2900-u8500.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/staging/cg2900/devices-cg2900-u8500.c b/drivers/staging/cg2900/devices-cg2900-u8500.c new file mode 100644 index 00000000000..cbadeee248d --- /dev/null +++ b/drivers/staging/cg2900/devices-cg2900-u8500.c @@ -0,0 +1,130 @@ +/* + * arch/arm/mach-ux500/devices-cg2900-u8500.c + * + * Copyright (C) ST-Ericsson SA 2010 + * Authors: + * Par-Gunnar Hjalmdahl (par-gunnar.p.hjalmdahl@stericsson.com) for ST-Ericsson. + * Henrik Possung (henrik.possung@stericsson.com) for ST-Ericsson. + * Josef Kindberg (josef.kindberg@stericsson.com) for ST-Ericsson. + * Dariusz Szymszak (dariusz.xd.szymczak@stericsson.com) for ST-Ericsson. + * Kjell Andersson (kjell.k.andersson@stericsson.com) for ST-Ericsson. + * License terms: GNU General Public License (GPL), version 2 + * + * Board specific device support for the Linux Bluetooth HCI H:4 Driver + * for ST-Ericsson connectivity controller. + */ + +#include <asm/byteorder.h> +#include <asm-generic/errno-base.h> +#include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/types.h> +#include <plat/pincfg.h> + +#include "devices-cg2900.h" + +void dcg2900_enable_chip(struct cg2900_chip_dev *dev) +{ + struct dcg2900_info *info = dev->b_data; + + if (info->gbf_gpio == -1) + return; + + /* + * Due to a bug in CG2900 we cannot just set GPIO high to enable + * the chip. We must wait more than 100 msecs before enbling the + * chip. + * - Set PDB to low. + * - Wait for 100 msecs + * - Set PDB to high. + */ + gpio_set_value(info->gbf_gpio, 0); + schedule_timeout_uninterruptible(msecs_to_jiffies( + CHIP_ENABLE_PDB_LOW_TIMEOUT)); + gpio_set_value(info->gbf_gpio, 1); +} + +void dcg2900_disable_chip(struct cg2900_chip_dev *dev) +{ + struct dcg2900_info *info = dev->b_data; + + if (info->gbf_gpio != -1) + gpio_set_value(info->gbf_gpio, 0); +} + +int dcg2900_setup(struct cg2900_chip_dev *dev, + struct dcg2900_info *info) +{ + int err = 0; + struct resource *resource; + const char *gbf_name; + const char *bt_name = NULL; + + resource = platform_get_resource_byname(dev->pdev, IORESOURCE_IO, + "gbf_ena_reset"); + if (!resource) { + dev_err(dev->dev, "GBF GPIO does not exist\n"); + err = -EINVAL; + goto err_handling; + } + + info->gbf_gpio = resource->start; + gbf_name = resource->name; + + resource = platform_get_resource_byname(dev->pdev, IORESOURCE_IO, + "bt_enable"); + /* BT Enable GPIO may not exist */ + if (resource) { + info->bt_gpio = resource->start; + bt_name = resource->name; + } + + /* Now setup the GPIOs */ + err = gpio_request(info->gbf_gpio, gbf_name); + if (err < 0) { + dev_err(dev->dev, "gpio_request failed with err: %d\n", err); + goto err_handling; + } + + err = gpio_direction_output(info->gbf_gpio, 0); + if (err < 0) { + dev_err(dev->dev, "gpio_direction_output failed with err: %d\n", + err); + goto err_handling_free_gpio_gbf; + } + + if (!bt_name) { + info->bt_gpio = -1; + goto finished; + } + + err = gpio_request(info->bt_gpio, bt_name); + if (err < 0) { + dev_err(dev->dev, "gpio_request failed with err: %d\n", err); + goto err_handling_free_gpio_gbf; + } + + err = gpio_direction_output(info->bt_gpio, 1); + if (err < 0) { + dev_err(dev->dev, "gpio_direction_output failed with err: %d\n", + err); + goto err_handling_free_gpio_bt; + } + +finished: + + return 0; + +err_handling_free_gpio_bt: + gpio_free(info->bt_gpio); +err_handling_free_gpio_gbf: + gpio_free(info->gbf_gpio); +err_handling: + + return err; +} |