diff options
Diffstat (limited to 'drivers/mxc/pmic/core/pmic_core_spi.c')
| -rw-r--r-- | drivers/mxc/pmic/core/pmic_core_spi.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/mxc/pmic/core/pmic_core_spi.c b/drivers/mxc/pmic/core/pmic_core_spi.c new file mode 100644 index 000000000000..5461dbe3f0f0 --- /dev/null +++ b/drivers/mxc/pmic/core/pmic_core_spi.c @@ -0,0 +1,303 @@ +/* + * Copyright 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +/*! + * @file pmic_core_spi.c + * @brief This is the main file for the PMIC Core/Protocol driver. SPI + * should be providing the interface between the PMIC and the MCU. + * + * @ingroup PMIC_CORE + */ + +/* + * Includes + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/spi/spi.h> +#include <linux/pmic_external.h> +#include <linux/pmic_status.h> + +#include <asm/uaccess.h> + +#include "pmic.h" + +/* + * Static functions + */ +static void pmic_pdev_register(void); +static void pmic_pdev_unregister(void); + +/* + * Platform device structure for PMIC client drivers + */ +static struct platform_device adc_ldm = { + .name = "pmic_adc", + .id = 1, +}; +static struct platform_device battery_ldm = { + .name = "pmic_battery", + .id = 1, +}; +static struct platform_device power_ldm = { + .name = "pmic_power", + .id = 1, +}; +static struct platform_device rtc_ldm = { + .name = "pmic_rtc", + .id = 1, +}; +static struct platform_device light_ldm = { + .name = "pmic_light", + .id = 1, +}; +static struct platform_device rleds_ldm = { + .name = "pmic_leds", + .id = 'r', +}; +static struct platform_device gleds_ldm = { + .name = "pmic_leds", + .id = 'g', +}; +static struct platform_device bleds_ldm = { + .name = "pmic_leds", + .id = 'b', +}; + +/* + * External functions + */ +extern void pmic_event_list_init(void); +extern void pmic_event_callback(type_event event); +extern void gpio_pmic_active(void); +extern irqreturn_t pmic_irq_handler(int irq, void *dev_id); +extern pmic_version_t mxc_pmic_version; + +/*! + * This function registers platform device structures for + * PMIC client drivers. + */ +static void pmic_pdev_register(void) +{ + platform_device_register(&adc_ldm); + platform_device_register(&battery_ldm); + platform_device_register(&rtc_ldm); + platform_device_register(&power_ldm); + platform_device_register(&light_ldm); + platform_device_register(&rleds_ldm); + platform_device_register(&gleds_ldm); + platform_device_register(&bleds_ldm); +} + +/*! + * This function unregisters platform device structures for + * PMIC client drivers. + */ +static void pmic_pdev_unregister(void) +{ + platform_device_unregister(&adc_ldm); + platform_device_unregister(&battery_ldm); + platform_device_unregister(&rtc_ldm); + platform_device_unregister(&power_ldm); + platform_device_unregister(&light_ldm); +} + +/*! + * This function puts the SPI slave device in low-power mode/state. + * + * @param spi the SPI slave device + * @param message the power state to enter + * + * @return Returns 0 on SUCCESS and error on FAILURE. + */ +static int pmic_suspend(struct spi_device *spi, pm_message_t message) +{ + return PMIC_SUCCESS; +} + +/*! + * This function brings the SPI slave device back from low-power mode/state. + * + * @param spi the SPI slave device + * + * @return Returns 0 on SUCCESS and error on FAILURE. + */ +static int pmic_resume(struct spi_device *spi) +{ + return PMIC_SUCCESS; +} + +static struct spi_driver pmic_driver; + +/*! + * This function is called whenever the SPI slave device is detected. + * + * @param spi the SPI slave device + * + * @return Returns 0 on SUCCESS and error on FAILURE. + */ +static int __devinit pmic_probe(struct spi_device *spi) +{ + int ret = 0; + struct pmic_platform_data *plat_data = spi->dev.platform_data; + + /* Initialize the PMIC parameters */ + ret = pmic_spi_setup(spi); + if (ret != PMIC_SUCCESS) { + return PMIC_ERROR; + } + + /* Initialize the PMIC event handling */ + pmic_event_list_init(); + + /* Initialize GPIO for PMIC Interrupt */ + gpio_pmic_active(); + + /* Get the PMIC Version */ + pmic_get_revision(&mxc_pmic_version); + if (mxc_pmic_version.revision < 0) { + dev_err((struct device *)spi, + "PMIC not detected!!! Access Failed\n"); + return -ENODEV; + } else { + dev_dbg((struct device *)spi, + "Detected pmic core IC version number is %d\n", + mxc_pmic_version.revision); + } + + spi_set_drvdata(spi, pmic_alloc_data(&(spi->dev))); + + /* Initialize the PMIC parameters */ + ret = pmic_init_registers(); + if (ret != PMIC_SUCCESS) { + kfree(spi_get_drvdata(spi)); + spi_set_drvdata(spi, NULL); + return PMIC_ERROR; + } + + ret = pmic_start_event_thread(spi->irq); + if (ret) { + pr_err("mc13892 pmic driver init: \ + fail to start event thread\n"); + kfree(spi_get_drvdata(spi)); + spi_set_drvdata(spi, NULL); + return PMIC_ERROR; + } + + /* Set and install PMIC IRQ handler */ + set_irq_type(spi->irq, IRQF_TRIGGER_HIGH); + ret = request_irq(spi->irq, pmic_irq_handler, 0, "PMIC_IRQ", 0); + if (ret) { + kfree(spi_get_drvdata(spi)); + spi_set_drvdata(spi, NULL); + dev_err((struct device *)spi, "gpio1: irq%d error.", spi->irq); + return ret; + } + + enable_irq_wake(spi->irq); + + if (plat_data && plat_data->init) { + ret = plat_data->init(spi_get_drvdata(spi)); + if (ret != 0) { + kfree(spi_get_drvdata(spi)); + spi_set_drvdata(spi, NULL); + return PMIC_ERROR; + } + } + + power_ldm.dev.platform_data = spi->dev.platform_data; + + pmic_pdev_register(); + + printk(KERN_INFO "Device %s probed\n", dev_name(&spi->dev)); + + return PMIC_SUCCESS; +} + +/*! + * This function is called whenever the SPI slave device is removed. + * + * @param spi the SPI slave device + * + * @return Returns 0 on SUCCESS and error on FAILURE. + */ +static int __devexit pmic_remove(struct spi_device *spi) +{ + pmic_stop_event_thread(); + free_irq(spi->irq, 0); + + pmic_pdev_unregister(); + + printk(KERN_INFO "Device %s removed\n", dev_name(&spi->dev)); + + return PMIC_SUCCESS; +} + +/*! + * This structure contains pointers to the power management callback functions. + */ +static struct spi_driver pmic_driver = { + .driver = { + .name = "pmic_spi", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = pmic_probe, + .remove = __devexit_p(pmic_remove), + .suspend = pmic_suspend, + .resume = pmic_resume, +}; + +/* + * Initialization and Exit + */ + +/*! + * This function implements the init function of the PMIC device. + * This function is called when the module is loaded. It registers + * the PMIC Protocol driver. + * + * @return This function returns 0. + */ +static int __init pmic_init(void) +{ + return spi_register_driver(&pmic_driver); +} + +/*! + * This function implements the exit function of the PMIC device. + * This function is called when the module is unloaded. It unregisters + * the PMIC Protocol driver. + * + */ +static void __exit pmic_exit(void) +{ + pr_debug("Unregistering the PMIC Protocol Driver\n"); + spi_unregister_driver(&pmic_driver); +} + +/* + * Module entry points + */ +subsys_initcall_sync(pmic_init); +module_exit(pmic_exit); + +MODULE_DESCRIPTION("Core/Protocol driver for PMIC"); +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_LICENSE("GPL"); |