diff options
Diffstat (limited to 'drivers/modem/m6718_spi/modem_driver.c')
| -rw-r--r-- | drivers/modem/m6718_spi/modem_driver.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/modem/m6718_spi/modem_driver.c b/drivers/modem/m6718_spi/modem_driver.c new file mode 100644 index 00000000000..7d0efa6e395 --- /dev/null +++ b/drivers/modem/m6718_spi/modem_driver.c @@ -0,0 +1,134 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * + * Author: Chris Blair <chris.blair@stericsson.com> for ST-Ericsson + * based on modem_shrm_driver.c + * + * License terms: GNU General Public License (GPL) version 2 + * + * SPI driver implementing the M6718 inter-processor communication protocol. + */ +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/spi/spi.h> +#include <linux/modem/modem_client.h> +#include <linux/modem/m6718_spi/modem_driver.h> + +static struct modem_spi_dev modem_driver_data = { + .dev = NULL, + .ndev = NULL, + .modem = NULL, + .isa_context = NULL, + .netdev_flag_up = 0 +}; + +/** + * modem_m6718_spi_receive() - Receive a frame from L1 physical layer + * @sdev: pointer to spi device structure + * @channel: L2 mux channel id + * @len: frame data length + * @data: pointer to frame data + * + * This function is called from the driver L1 physical transport layer. It + * copied the frame data to the receive queue for the channel on which the data + * was received. + * + * Special handling is given to slave-loopback channels where the data is simply + * sent back to the modem on the same channel. + * + * Special handling is given to the ISI channel when PHONET is enabled - the + * phonet tasklet is scheduled in order to pump the received data through the + * net device interface. + */ +int modem_m6718_spi_receive(struct spi_device *sdev, u8 channel, + u32 len, void *data) +{ + return -ENODEV; +} +EXPORT_SYMBOL_GPL(modem_m6718_spi_receive); + +static int spi_probe(struct spi_device *sdev) +{ + int result = 0; + + spi_set_drvdata(sdev, &modem_driver_data); + + /* + * Since we can have multiple spi links for the same modem, only + * initialise the modem data and char/net interfaces once. + */ + if (modem_driver_data.dev == NULL) { + modem_driver_data.dev = &sdev->dev; + modem_driver_data.modem = + modem_get(modem_driver_data.dev, "m6718"); + if (modem_driver_data.modem == NULL) { + dev_err(&sdev->dev, + "failed to retrieve modem description\n"); + result = -ENODEV; + } + } + return result; +} + +static int __exit spi_remove(struct spi_device *sdev) +{ + return 0; +} + +#ifdef CONFIG_PM +/** + * spi_suspend() - This routine puts the IPC driver in to suspend state. + * @sdev: pointer to spi device structure. + * @mesg: pm operation + * + * This routine checks the current ongoing communication with modem + * and prevents suspend if modem communication is on-going. + */ +static int spi_suspend(struct spi_device *sdev, pm_message_t mesg) +{ + dev_dbg(&sdev->dev, "suspend called\n"); + return 0; +} + +/** + * spi_resume() - This routine resumes the IPC driver from suspend state. + * @sdev: pointer to spi device structure + */ +static int spi_resume(struct spi_device *sdev) +{ + dev_dbg(&sdev->dev, "resume called\n"); + return 0; +} +#endif /* CONFIG_PM */ + +static struct spi_driver spi_driver = { + .driver = { + .name = "spimodem", + .bus = &spi_bus_type, + .owner = THIS_MODULE + }, + .probe = spi_probe, + .remove = __exit_p(spi_remove), +#ifdef CONFIG_PM + .suspend = spi_suspend, + .resume = spi_resume, +#endif +}; + +static int __init m6718_spi_driver_init(void) +{ + pr_info("M6718 modem driver initialising\n"); + return spi_register_driver(&spi_driver); +} +module_init(m6718_spi_driver_init); + +static void __exit m6718_spi_driver_exit(void) +{ + pr_debug("M6718 modem SPI IPC driver exit\n"); + spi_unregister_driver(&spi_driver); +} +module_exit(m6718_spi_driver_exit); + +MODULE_AUTHOR("Chris Blair <chris.blair@stericsson.com>"); +MODULE_DESCRIPTION("M6718 modem IPC SPI driver"); +MODULE_LICENSE("GPL v2"); |