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Message-ID: <98670.43991.qm@web94911.mail.in2.yahoo.com>
Date: Fri, 26 Mar 2010 01:55:15 +0530 (IST)
From: Pavan Savoy <pavan_savoy@...oo.co.in>
To: marcel@...tmann.org, gregkh@...e.de, alan@...rguk.ukuu.org.uk,
pavan_savoy@...com
Cc: linux-kernel@...r.kernel.org, Pavan Savoy <pavan_savoy@...com>
Subject: Re: [PATCH 3/7] drivers:staging: sources for Init manager module
Marcel, Greg, Alan,
--- On Fri, 26/3/10, pavan_savoy@...com <pavan_savoy@...com> wrote:
> From: pavan_savoy@...com <pavan_savoy@...com>
> Subject: [PATCH 3/7] drivers:staging: sources for Init manager module
> To: marcel@...tmann.org, gregkh@...e.de, alan@...rguk.ukuu.org.uk
> Cc: linux-kernel@...r.kernel.org, pavan_savoy@...oo.co.in, "Pavan Savoy" <pavan_savoy@...com>
> Date: Friday, 26 March, 2010, 1:51 AM
> From: Pavan Savoy <pavan_savoy@...com>
>
> Kernel Space Init-Manager works along with User-Mode
> Init Manager daemon running to maintain the UART state.
>
> Communication between user-space daemon and this module can
> be
> 1. Via the pid written onto sysfs entry
> 2. Via the rfkill subsystem
>
> It also is a platform driver with a relevant platform
> device
> in the board-*.c along with the list of BT/FM/GPS chip
> enable
> gpio configuration
>
> Signed-off-by: Pavan Savoy <pavan_savoy@...com>
> ---
> drivers/staging/ti-st/st_kim.c | 747
> ++++++++++++++++++++++++++++++++++++++++
> drivers/staging/ti-st/st_kim.h | 151 ++++++++
> 2 files changed, 898 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/ti-st/st_kim.c
> create mode 100644 drivers/staging/ti-st/st_kim.h
>
> diff --git a/drivers/staging/ti-st/st_kim.c
> b/drivers/staging/ti-st/st_kim.c
> new file mode 100644
> index 0000000..eac470d
> --- /dev/null
> +++ b/drivers/staging/ti-st/st_kim.c
> @@ -0,0 +1,747 @@
> +/*
> + * Shared Transport Line discipline driver Core
> + * Init Manager module responsible for
> GPIO control
> + * and firmware download
> + * Copyright (C) 2009 Texas Instruments
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it
> will be useful,
> + * but WITHOUT ANY WARRANTY; without even the
> implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU
> General Public License
> + * along with this program; if not, write to the
> Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330,
> Boston, MA 02111-1307 USA
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/jiffies.h>
> +#include <linux/firmware.h>
> +#include <linux/delay.h>
> +#include <linux/wait.h>
> +#include <linux/gpio.h>
> +
> +#include <linux/sched.h>
> +
> +#include "st_kim.h"
> +/* understand BT events for fw response */
> +#include <net/bluetooth/bluetooth.h>
> +#include <net/bluetooth/hci_core.h>
> +#include <net/bluetooth/hci.h>
> +
> +
> +#define DEBUG
> +/* all debug macros go in here */
> +#define ST_KIM_ERR(fmt, arg...) printk(KERN_ERR
> "(stk):"fmt"\n" , ## arg)
> +#if defined(DEBUG) /*
> limited debug messages */
> +#define ST_KIM_DBG(fmt, arg...) printk(KERN_INFO
> "(stk):"fmt"\n" , ## arg)
> +#define ST_KIM_VER(fmt, arg...)
> +#elif defined(VERBOSE)
> /* very verbose */
> +#define ST_KIM_DBG(fmt, arg...) printk(KERN_INFO
> "(stk):"fmt"\n" , ## arg)
> +#define ST_KIM_VER(fmt, arg...) printk(KERN_INFO
> "(stk):"fmt"\n" , ## arg)
> +#else /* error msgs only */
> +#define ST_KIM_DBG(fmt, arg...)
> +#define ST_KIM_VER(fmt, arg...)
> +#endif
> +
> +static int kim_probe(struct platform_device *pdev);
> +static int kim_remove(struct platform_device *pdev);
> +
> +/* KIM platform device driver structure */
> +static struct platform_driver kim_platform_driver = {
> + .probe = kim_probe,
> + .remove = kim_remove,
> + /* TODO: ST driver power management
> during suspend/resume ?
> + */
> +#if 0
> + .suspend = kim_suspend,
> + .resume = kim_resume,
> +#endif
> + .driver = {
> +
> .name = "kim",
> +
> .owner = THIS_MODULE,
> +
> },
> +};
> +
> +#ifndef LEGACY_RFKILL_SUPPORT
> +static ssize_t show_pid(struct device *dev, struct
> device_attribute
> +
> *attr, char *buf);
> +static ssize_t store_pid(struct device *dev, struct
> device_attribute
> +
> *devattr, char *buf, size_t
> count);
> +static ssize_t show_list(struct device *dev, struct
> device_attribute
> +
> *attr, char *buf);
> +
> +/* structures specific for sysfs entries */
> +static struct kobj_attribute pid_attr =
> +__ATTR(pid, 0644, (void *)show_pid, (void *)store_pid);
> +
> +static struct kobj_attribute list_protocols =
> +__ATTR(protocols, 0444, (void *)show_list, NULL);
> +
> +static struct attribute *uim_attrs[] = {
> + &pid_attr.attr,
> + /* add more debug sysfs entries */
> + &list_protocols.attr,
> + NULL,
> +};
> +
> +static struct attribute_group uim_attr_grp = {
> + .attrs = uim_attrs,
> +};
> +#else
> +static int kim_toggle_radio(void*, bool);
> +static const struct rfkill_ops kim_rfkill_ops = {
> + .set_block = kim_toggle_radio,
> +};
> +#endif /* LEGACY_RFKILL_SUPPORT */
> +
> +/* strings to be used for rfkill entries and by
> + * ST Core to be used for sysfs debug entry
> + */
> +#define PROTO_ENTRY(type, name) name
> +const unsigned char *protocol_names[] = {
> + PROTO_ENTRY(ST_BT, "Bluetooth"),
> + PROTO_ENTRY(ST_FM, "FM"),
> + PROTO_ENTRY(ST_GPS, "GPS"),
> +};
> +
> +static struct kim_data_s *kim_gdata;
> +
> +/**********************************************************************/
> +/* internal functions */
> +
> +/*
> + * function to return whether the firmware response was
> proper
> + * in case of error don't complete so that waiting for
> proper
> + * response times out
> + */
> +void validate_firmware_response(struct sk_buff *skb)
> +{
> + if (unlikely(skb->data[5] != 0)) {
> + ST_KIM_ERR("no
> proper response during fw download");
> + ST_KIM_ERR("data6
> %x", skb->data[5]);
> +
> return; /* keep waiting
> for the proper response */
> + }
> + /* becos of all the script being
> downloaded */
> +
> complete_all(&kim_gdata->kim_rcvd);
> + kfree_skb(skb);
> +}
> +
> +/* check for data len received inside kim_int_recv
> + * most often hit the last case to update state to waiting
> for data
> + */
> +static inline int kim_check_data_len(int len)
> +{
> + register int room =
> skb_tailroom(kim_gdata->rx_skb);
> +
> + ST_KIM_DBG("len %d room %d", len,
> room);
> +
> + if (!len) {
> +
> validate_firmware_response(kim_gdata->rx_skb);
> + } else if (len > room) {
> + /* Received packet's
> payload length is larger.
> + * We
> can't accommodate it in created skb.
> + */
> + ST_KIM_ERR("Data
> length is too large len %d room %d", len,
> +
> room);
> +
> kfree_skb(kim_gdata->rx_skb);
> + } else {
> + /* Packet header has
> non-zero payload length and
> + * we have
> enough space in created skb. Lets read
> + * payload
> data */
> +
> kim_gdata->rx_state = ST_BT_W4_DATA;
> +
> kim_gdata->rx_count = len;
> + return len;
> + }
> +
> + /* Change ST LL state to continue to
> process next
> + * packet */
> + kim_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> + kim_gdata->rx_skb = NULL;
> + kim_gdata->rx_count = 0;
> +
> + return 0;
> +}
> +
> +/* receive function called during firmware download
> + * - firmware download responses on different UART
> drivers
> + * have been observed to come in bursts
> of different
> + * tty_receive and hence the logic
> + */
> +void kim_int_recv(const unsigned char *data, long count)
> +{
> + register char *ptr;
> + struct hci_event_hdr *eh;
> + register int len = 0, type = 0;
> +
> + ST_KIM_DBG("%s", __func__);
> + /* Decode received bytes here */
> + ptr = (char *)data;
> + if (unlikely(ptr == NULL)) {
> + ST_KIM_ERR("
> received null from TTY ");
> + return;
> + }
> + while (count) {
> + if
> (kim_gdata->rx_count) {
> +
> len = min_t(unsigned int, kim_gdata->rx_count, count);
> +
> memcpy(skb_put(kim_gdata->rx_skb, len), ptr, len);
> +
> kim_gdata->rx_count -= len;
> +
> count -= len;
> +
> ptr += len;
> +
> +
> if (kim_gdata->rx_count)
> +
> continue;
> +
> +
> /* Check ST RX state machine , where are we? */
> +
> switch (kim_gdata->rx_state) {
> +
> /* Waiting for complete packet ? */
> +
> case ST_BT_W4_DATA:
> +
> ST_KIM_DBG("Complete pkt received");
> +
>
> validate_firmware_response(kim_gdata->rx_skb);
> +
> kim_gdata->rx_state =
> ST_W4_PACKET_TYPE;
> +
> kim_gdata->rx_skb = NULL;
> +
> continue;
> +
> /* Waiting for Bluetooth event header ?
> */
> +
> case ST_BT_W4_EVENT_HDR:
> +
> eh = (struct hci_event_hdr
> *)kim_gdata->
> +
> rx_skb->data;
> +
> ST_KIM_DBG("Event header: evt 0x%2.2x"
> +
>
> "plen %d", eh->evt, eh->plen);
> +
> kim_check_data_len(eh->plen);
> +
> continue;
> +
> } /* end of switch */
> + }
> /* end of if rx_state */
> + switch (*ptr) {
> +
> /* Bluetooth event packet? */
> + case HCI_EVENT_PKT:
> +
> ST_KIM_DBG("Event packet");
> +
> kim_gdata->rx_state = ST_BT_W4_EVENT_HDR;
> +
> kim_gdata->rx_count = HCI_EVENT_HDR_SIZE;
> +
> type = HCI_EVENT_PKT;
> +
> break;
> + default:
> +
> ST_KIM_DBG("unknown packet");
> +
> ptr++;
> +
> count--;
> +
> continue;
> + }
> /* end of switch *ptr */
> + ptr++;
> + count--;
> + kim_gdata->rx_skb
> =
> +
> bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
> + if
> (!kim_gdata->rx_skb) {
> +
> ST_KIM_ERR("can't allocate mem for new packet");
> +
> kim_gdata->rx_state = ST_W4_PACKET_TYPE;
> +
> kim_gdata->rx_count = 0;
> +
> return;
> + } /* not necessary
> in this case */
> +
> bt_cb(kim_gdata->rx_skb)->pkt_type = type;
> + }
> /* end of while count */
> + ST_KIM_DBG("done %s", __func__);
> + return;
> +}
> +
> +static long read_local_version(char *bts_scr_name)
> +{
> + unsigned short version = 0, chip = 0,
> min_ver = 0, maj_ver = 0;
> + char read_ver_cmd[] = { 0x01, 0x01,
> 0x10, 0x00 };
> +
> + ST_KIM_DBG("%s", __func__);
> +
> +
> INIT_COMPLETION(kim_gdata->kim_rcvd);
> + if (4 != st_int_write(read_ver_cmd, 4))
> {
> + ST_KIM_ERR("kim:
> couldn't write 4 bytes");
> + return
> ST_ERR_FAILURE;
> + }
> +
> + if (!wait_for_completion_timeout
> +
> (&kim_gdata->kim_rcvd,
> msecs_to_jiffies(CMD_RESP_TIME))) {
> + ST_KIM_ERR(" waiting
> for ver info- timed out ");
> + return
> ST_ERR_FAILURE;
> + }
> +
> + version =
> +
> MAKEWORD(kim_gdata->resp_buffer[13],
> kim_gdata->resp_buffer[14]);
> + chip = (version & 0x7C00) >>
> 10;
> + min_ver = (version & 0x007F);
> + maj_ver = (version & 0x0380)
> >> 7;
> +
> + if (version & 0x8000)
> + maj_ver |= 0x0008;
> +
> + sprintf(bts_scr_name,
> "TIInit_%d.%d.%d.bts", chip, maj_ver, min_ver);
> + ST_KIM_DBG("%s", bts_scr_name);
> + return ST_SUCCESS;
> +}
> +
> +/* internal function which parses through the .bts
> firmware script file
> + * intreprets SEND, DELAY actions only as of now
> + */
> +static long download_firmware(void)
> +{
> + long err = ST_SUCCESS;
> + long len = 0;
> + register unsigned char *ptr = NULL;
> + register unsigned char *action_ptr =
> NULL;
> + unsigned char bts_scr_name[30] = { 0
> }; /* 30 char long bts scr name? */
> +
> + ST_KIM_VER("%s", __func__);
> +
> + err =
> read_local_version(bts_scr_name);
> + if (err != ST_SUCCESS) {
> + ST_KIM_ERR("kim:
> failed to read local ver");
> + return err;
> + }
> + err =
> +
> request_firmware(&kim_gdata->fw_entry, bts_scr_name,
> +
>
> &kim_gdata->kim_pdev->dev);
> + if (unlikely((err != 0) ||
> (kim_gdata->fw_entry->data == NULL) ||
> +
> (kim_gdata->fw_entry->size == 0)))
> {
> + ST_KIM_ERR("
> request_firmware failed(errno %ld) for %s", err,
> +
> bts_scr_name);
> + return
> ST_ERR_FAILURE;
> + }
> + ptr = (void
> *)kim_gdata->fw_entry->data;
> + len = kim_gdata->fw_entry->size;
> + /* bts_header to remove out magic
> number and
> + * version
> + */
> + ptr += sizeof(struct bts_header);
> + len -= sizeof(struct bts_header);
> +
> + while (len > 0 && ptr) {
> + ST_KIM_VER(" action
> size %d, type %d ",
> +
> ((struct bts_action *)ptr)->size,
> +
> ((struct bts_action *)ptr)->type);
> +
> + switch (((struct
> bts_action *)ptr)->type) {
> + case
> ACTION_SEND_COMMAND: /* action send */
> +
> action_ptr = &(((struct bts_action *)ptr)->data[0]);
> +
> if (unlikely
> +
> (((struct hci_command *)action_ptr)->opcode
> ==
> +
> 0xFF36)) {
> +
> /* ignore remote change
> +
> * baud rate HCI VS command */
> +
> ST_KIM_ERR
> +
> (" change remote baud\
> +
> rate command in
> firmware");
> +
> break;
> +
> }
> +
> +
> INIT_COMPLETION(kim_gdata->kim_rcvd);
> +
> err = st_int_write(((struct bts_action_send *)
> +
>
> action_ptr)->data,
> +
>
> ((struct bts_action *)ptr)->size);
> +
> if (unlikely(err < 0)) {
> +
>
> release_firmware(kim_gdata->fw_entry);
> +
> return ST_ERR_FAILURE;
> +
> }
> +
> if (!wait_for_completion_timeout
> +
> (&kim_gdata->kim_rcvd,
> +
> msecs_to_jiffies(CMD_RESP_TIME)))
> {
> +
> ST_KIM_ERR
> +
> (" response timeout during
> fw download ");
> +
> /* timed out */
> +
>
> release_firmware(kim_gdata->fw_entry);
> +
> return ST_ERR_FAILURE;
> +
> }
> +
> break;
> + case
> ACTION_DELAY: /* sleep */
> +
> ST_KIM_DBG("sleep command in scr");
> +
> action_ptr = &(((struct bts_action *)ptr)->data[0]);
> +
> mdelay(((struct bts_action_delay *)action_ptr)->msec);
> +
> break;
> + }
> + len =
> + len -
> (sizeof(struct bts_action) +
> +
> ((struct bts_action *)ptr)->size);
> + ptr =
> + ptr +
> sizeof(struct bts_action) +
> +
> ((struct bts_action *)ptr)->size;
> + }
> + /* fw download complete */
> +
> release_firmware(kim_gdata->fw_entry);
> + return ST_SUCCESS;
> +}
> +
> +/**********************************************************************/
> +/* functions called from ST core */
> +
> +/* function to toggle the GPIO
> + * needs to know whether the GPIO is active high or active
> low
> + */
> +void st_kim_chip_toggle(enum proto_type type, enum
> kim_gpio_state state)
> +{
> + ST_KIM_DBG(" %s ", __func__);
> +
> + if (kim_gdata->gpios[type] == -1) {
> + ST_KIM_DBG(" gpio
> not requested for protocol %s",
> +
> protocol_names[type]);
> + return;
> + }
> + switch (type) {
> + case ST_BT:
> + /*Do Nothing */
> + break;
> +
> + case ST_FM:
> + if (state ==
> KIM_GPIO_ACTIVE)
> +
> gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_LOW);
> + else
> +
> gpio_set_value(kim_gdata->gpios[ST_FM], GPIO_HIGH);
> + break;
> +
> + case ST_GPS:
> + if (state ==
> KIM_GPIO_ACTIVE)
> +
> gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_HIGH);
> + else
> +
> gpio_set_value(kim_gdata->gpios[ST_GPS], GPIO_LOW);
> + break;
> +
> + case ST_MAX:
> + default:
> + break;
> + }
> +
> + return;
> +}
> +
> +/* called from ST Core, when REG_IN_PROGRESS (registration
> in progress)
> + * can be because of
> + * 1. response to read local version
> + * 2. during send/recv's of firmware download
> + */
> +void st_kim_recv(const unsigned char *data, long count)
> +{
> + ST_KIM_DBG(" %s ", __func__);
> + /* copy to local buffer */
> + if (unlikely(data[4] == 0x01 &&
> data[5] == 0x10 && data[0] == 0x04)) {
> + /* must be the
> read_ver_cmd */
> +
> memcpy(kim_gdata->resp_buffer, data, count);
> +
> complete_all(&kim_gdata->kim_rcvd);
> + return;
> + } else {
> + kim_int_recv(data,
> count);
> + /* either completes
> or times out */
> + }
> + return;
> +}
> +
> +/* to signal completion of line discipline installation
> + * called from ST Core, upon tty_open
> + */
> +void st_kim_complete(void)
> +{
> +
> complete(&kim_gdata->ldisc_installed);
> +}
> +
> +/* called from ST Core upon 1st registration
> +*/
> +long st_kim_start(void)
> +{
> + long err = ST_SUCCESS;
> + long retry = POR_RETRY_COUNT;
> + ST_KIM_DBG(" %s", __func__);
> +
> + do {
> +#ifdef LEGACY_RFKILL_SUPPORT
> + /* TODO: this is
> only because rfkill sub-system
> + * doesn't
> send events to user-space if the state
> + * isn't
> changed
> + */
> +
> rfkill_set_sw_state(kim_gdata->rfkill[ST_BT], 1);
> +#endif
> + /* Configure BT
> nShutdown to HIGH state */
> +
> gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
> +
> mdelay(5); /* FIXME: a proper toggle */
> +
> gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH);
> + mdelay(100);
> + /* re-initialize the
> completion */
> +
> INIT_COMPLETION(kim_gdata->ldisc_installed);
> +#ifndef LEGACY_RFKILL_SUPPORT
> + /* send signal to
> UIM */
> + err =
> kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 0);
> + if (err != 0) {
> +
> ST_KIM_VER(" sending SIGUSR2 to uim failed %ld", err);
> +
> err = ST_ERR_FAILURE;
> +
> continue;
> + }
> +#else
> + /* unblock and send
> event to UIM via /dev/rfkill */
> +
> rfkill_set_sw_state(kim_gdata->rfkill[ST_BT], 0);
> +#endif
> + /* wait for ldisc to
> be installed */
> + err =
> wait_for_completion_timeout(&kim_gdata->ldisc_installed,
> +
> msecs_to_jiffies(LDISC_TIME));
> + if (!err)
> { /* timeout */
> +
> ST_KIM_ERR("line disc installation timed out ");
> +
> err = ST_ERR_FAILURE;
> +
> continue;
> + } else {
> +
> /* ldisc installed now */
> +
> ST_KIM_DBG(" line discipline installed ");
> +
> err = download_firmware();
> +
> if (err != ST_SUCCESS) {
> +
> ST_KIM_ERR("download firmware failed");
> +
> continue;
> + }
> else { /* on success don't retry */
> +
> break;
> +
> }
> + }
> + } while (retry--);
> + return err;
> +}
> +
> +/* called from ST Core, on the last un-registration
> +*/
> +long st_kim_stop(void)
> +{
> + long err = ST_SUCCESS;
> +
> +
> INIT_COMPLETION(kim_gdata->ldisc_installed);
> +#ifndef LEGACY_RFKILL_SUPPORT
> + /* send signal to UIM */
> + err =
> kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 1);
> + if (err != 0) {
> + ST_KIM_ERR("sending
> SIGUSR2 to uim failed %ld", err);
> + return
> ST_ERR_FAILURE;
> + }
> +#else
> + /* set BT rfkill to be blocked */
> + err =
> rfkill_set_sw_state(kim_gdata->rfkill[ST_BT], 1);
> +#endif
> +
> + /* wait for ldisc to be un-installed
> */
> + err =
> wait_for_completion_timeout(&kim_gdata->ldisc_installed,
> +
> msecs_to_jiffies(LDISC_TIME));
> + if (!err) {
> /* timeout */
> + ST_KIM_ERR(" timed
> out waiting for ldisc to be un-installed");
> + return
> ST_ERR_FAILURE;
> + }
> +
> + /* By default configure BT nShutdown to
> LOW state */
> +
> gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
> + mdelay(1);
> +
> gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_HIGH);
> + mdelay(1);
> +
> gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW);
> + return err;
> +}
> +
> +/**********************************************************************/
> +/* functions called from subsystems */
> +
> +#ifndef LEGACY_RFKILL_SUPPORT
> +/* called when sysfs entry is written to */
> +static ssize_t store_pid(struct device *dev, struct
> device_attribute
> +
> *devattr, char *buf, size_t
> count)
> +{
> + ST_KIM_DBG("%s: pid %s ", __func__,
> buf);
> + sscanf(buf, "%ld",
> &kim_gdata->uim_pid);
> + /* to be made use by kim_start to
> signal SIGUSR2
> + */
> + return strlen(buf);
> +}
> +
> +/* called when sysfs entry is read from */
> +static ssize_t show_pid(struct device *dev, struct
> device_attribute
> +
> *attr, char *buf)
> +{
> + sprintf(buf, "%ld",
> kim_gdata->uim_pid);
> + return strlen(buf);
> +}
> +
> +/* called when sysfs entry is read from */
> +static ssize_t show_list(struct device *dev, struct
> device_attribute
> +
> *attr, char *buf)
> +{
> + kim_st_list_protocols(buf);
> + return strlen(buf);
> +}
> +
> +#else /* LEGACY_RFKILL_SUPPORT */
> +
> +/* function called from rfkill subsystem, when someone
> from
> + * user space would write 0/1 on the sysfs entry
> + * /sys/class/rfkill/rfkill0,1,3/state
> + */
> +static int kim_toggle_radio(void *data, bool blocked)
> +{
> + enum proto_type type = *((enum
> proto_type *)data);
> + ST_KIM_DBG(" %s: %d ", __func__,
> type);
> +
> + switch (type) {
> + case ST_BT:
> + /* do nothing */
> + break;
> + case ST_FM:
> + case ST_GPS:
> + if (blocked)
> +
> st_kim_chip_toggle(type, KIM_GPIO_INACTIVE);
> + else
> +
> st_kim_chip_toggle(type, KIM_GPIO_ACTIVE);
> + break;
> + case ST_MAX:
> + ST_KIM_ERR(" wrong
> proto type ");
> + break;
> + }
> + return ST_SUCCESS;
> +}
> +
> +#endif /* LEGACY_RFKILL_SUPPORT */
> +
> +/**********************************************************************/
> +/* functions called from platform device driver subsystem
> + * need to have a relevant platform device entry in the
> platform's
> + * board-*.c file
> + */
> +
> +static int kim_probe(struct platform_device *pdev)
> +{
> + long status;
> + long proto;
> + long *gpios =
> pdev->dev.platform_data;
> +
> + for (proto = 0; proto < ST_MAX;
> proto++) {
> +
> kim_gdata->gpios[proto] = gpios[proto];
> + ST_KIM_VER(" %ld
> gpio to be requested", gpios[proto]);
> + }
> +
> + for (proto = 0; (proto < ST_MAX)
> && (gpios[proto] != -1); proto++) {
> + /* Claim the
> Bluetooth/FM/GPIO
> + *
> nShutdown gpio from the system
> + */
> + status =
> gpio_request(gpios[proto], "kim");
> + if
> (unlikely(status)) {
> +
> ST_KIM_ERR(" gpio %ld request failed ", gpios[proto]);
> +
> proto -= 1;
> +
> while (proto >= 0) {
> +
> if (gpios[proto] != -1)
> +
>
> gpio_free(gpios[proto]);
> +
> }
> +
> return status;
> + }
> +
> + /* Configure
> nShutdown GPIO as output=0 */
> + status =
> +
> gpio_direction_output(gpios[proto], 0);
> + if
> (unlikely(status)) {
> +
> ST_KIM_ERR(" unable to configure gpio %ld",
> +
> gpios[proto]);
> +
> proto -= 1;
> +
> while (proto >= 0) {
> +
> if (gpios[proto] != -1)
> +
>
> gpio_free(gpios[proto]);
> +
> }
> +
> return status;
> + }
> + }
> +#ifndef LEGACY_RFKILL_SUPPORT
> + /* pdev to contain BT, FM and GPS
> enable/N-Shutdown GPIOs
> + * execute request_gpio, set
> output direction
> + */
> + kim_gdata->kim_kobj =
> kobject_create_and_add("uim", NULL);
> + /* create the sysfs entry for UIM to
> put in pid */
> + if
> (sysfs_create_group(kim_gdata->kim_kobj,
> &uim_attr_grp)) {
> + ST_KIM_ERR(" sysfs
> entry creation failed");
> +
> kobject_put(kim_gdata->kim_kobj);
> + /* free requested
> GPIOs and fail probe */
> + for (proto = ST_BT;
> proto < ST_MAX; proto++) {
> +
> if (gpios[proto] != -1)
> +
> gpio_free(gpios[proto]);
> + }
> + return
> -1; /* fail insmod */
> + }
> + ST_KIM_DBG(" sysfs entry created ");
> +#endif
> + /* get reference of pdev for
> request_firmware
> + */
> + kim_gdata->kim_pdev = pdev;
> +
> init_completion(&kim_gdata->kim_rcvd);
> +
> init_completion(&kim_gdata->ldisc_installed);
> +#ifdef LEGACY_RFKILL_SUPPORT
> + for (proto = 0; (proto < ST_MAX)
> && (gpios[proto] != -1); proto++) {
> + /* TODO: should all
> types be rfkill_type_bt ? */
> +
> kim_gdata->rfkill[proto] =
> rfkill_alloc(protocol_names[proto],
> +
> &pdev->dev, RFKILL_TYPE_BLUETOOTH,
> +
> &kim_rfkill_ops, &proto);
> + if
> (kim_gdata->rfkill[proto] == NULL) {
> +
> ST_KIM_ERR("cannot create rfkill entry for gpio %ld",
> +
> gpios[proto]);
> +
> continue;
> + }
> + /* block upon
> creation */
> +
> rfkill_init_sw_state(kim_gdata->rfkill[proto], 1);
> + status =
> rfkill_register(kim_gdata->rfkill[proto]);
> + if
> (unlikely(status)) {
> +
> ST_KIM_ERR("rfkill registration failed for gpio %ld",
> +
> gpios[proto]);
> +
> rfkill_unregister(kim_gdata->rfkill[proto]);
> +
> continue;
> + }
> + ST_KIM_DBG("rfkill
> entry created for %ld", gpios[proto]);
> + }
> +#endif
> + return ST_SUCCESS;
> +}
> +
> +static int kim_remove(struct platform_device *pdev)
> +{
> + /* free the GPIOs requested
> + */
> + long *gpios =
> pdev->dev.platform_data;
> + long proto;
> +
> + for (proto = 0; (proto < ST_MAX)
> && (gpios[proto] != -1); proto++) {
> + /* Claim the
> Bluetooth/FM/GPIO
> + *
> nShutdown gpio from the system
> + */
> +
> gpio_free(gpios[proto]);
> +#ifdef LEGACY_RFKILL_SUPPORT
> +
> rfkill_unregister(kim_gdata->rfkill[proto]);
> +
> rfkill_destroy(kim_gdata->rfkill[proto]);
> +
> kim_gdata->rfkill[proto] = NULL;
> +#endif
> + }
> + ST_KIM_DBG("kim: GPIO Freed");
> +#ifndef LEGACY_RFKILL_SUPPORT
> + /* delete the sysfs entries */
> +
> sysfs_remove_group(kim_gdata->kim_kobj,
> &uim_attr_grp);
> + kobject_put(kim_gdata->kim_kobj);
> +#endif
> + kim_gdata->kim_pdev = NULL;
> + return ST_SUCCESS;
> +}
> +
> +/**********************************************************************/
> +/* entry point for ST KIM module, called in from ST Core
> */
> +
> +long st_kim_init(void)
> +{
> + long ret = ST_SUCCESS;
> + kim_gdata = kzalloc(sizeof(struct
> kim_data_s), GFP_ATOMIC);
> + if (!kim_gdata) {
> + ST_KIM_ERR("no mem
> to allocate");
> + return -ENOMEM;
> + }
> + ret =
> platform_driver_register(&kim_platform_driver);
> + if (ret != 0) {
> + ST_KIM_ERR("platform
> drv registration failed");
> + return
> ST_ERR_FAILURE;
> + }
> + return ST_SUCCESS;
> +}
> +
> +long st_kim_deinit(void)
> +{
> + /* the following returns void */
> +
> platform_driver_unregister(&kim_platform_driver);
> + kfree(kim_gdata);
> + kim_gdata = NULL;
> + return ST_SUCCESS;
> +}
> diff --git a/drivers/staging/ti-st/st_kim.h
> b/drivers/staging/ti-st/st_kim.h
> new file mode 100644
> index 0000000..4e73bb4
> --- /dev/null
> +++ b/drivers/staging/ti-st/st_kim.h
> @@ -0,0 +1,151 @@
> +/*
> + * Shared Transport Line discipline driver Core
> + * Init Manager Module header file
> + * Copyright (C) 2009 Texas Instruments
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it
> will be useful,
> + * but WITHOUT ANY WARRANTY; without even the
> implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR
> PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU
> General Public License
> + * along with this program; if not, write to the
> Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330,
> Boston, MA 02111-1307 USA
> + *
> + */
> +
> +#ifndef ST_KIM_H
> +#define ST_KIM_H
> +
> +#include <linux/types.h>
> +#include "st.h"
> +#include "st_core.h"
> +#include "st_ll.h"
> +#include <linux/rfkill.h>
> +
> +/* time in msec to wait for
> + * line discipline to be installed
> + */
> +#define LDISC_TIME 500
> +#define CMD_RESP_TIME 500
> +#define MAKEWORD(a, b) ((unsigned short)(((unsigned
> char)(a)) \
> + | ((unsigned short)((unsigned
> char)(b))) << 8))
> +
> +#define GPIO_HIGH 1
> +#define GPIO_LOW 0
> +
> +/* the Power-On-Reset logic, requires to attempt
> + * to download firmware onto chip more than once
> + * since the self-test for chip takes a while
> + */
> +#define POR_RETRY_COUNT 5
> +/*
> + * legacy rfkill support where-in 3 rfkill
> + * devices are created for the 3 gpios
> + * that ST has requested
> + */
> +#define LEGACY_RFKILL_SUPPORT
> +/*
> + * header file for ST provided by KIM
> + */
> +struct kim_data_s {
> + long uim_pid;
> + struct platform_device *kim_pdev;
> + struct completion kim_rcvd,
> ldisc_installed;
> + /* MAX len of the .bts firmware script
> name */
> + char resp_buffer[30];
> + const struct firmware *fw_entry;
> + long gpios[ST_MAX];
> + struct kobject *kim_kobj;
> +/* used by kim_int_recv to validate fw response */
> + unsigned long rx_state;
> + unsigned long rx_count;
> + struct sk_buff *rx_skb;
> +#ifdef LEGACY_RFKILL_SUPPORT
> + struct rfkill *rfkill[ST_MAX];
> +#endif
> +};
> +
> +long st_kim_init(void);
> +long st_kim_deinit(void);
> +
> +long st_kim_start(void);
> +long st_kim_stop(void);
> +/*
> + * called from st_tty_receive to authenticate fw_download
> + */
> +void st_kim_recv(const unsigned char *, long count);
> +
> +void st_kim_chip_toggle(enum proto_type, enum
> kim_gpio_state);
> +
> +void st_kim_complete(void);
> +
> +/* function called from ST KIM to ST Core, to
> + * list out the protocols registered
> + */
> +void kim_st_list_protocols(char *);
> +
> +/*
> + * BTS headers
> + */
> +#define ACTION_SEND_COMMAND 1
> +#define ACTION_WAIT_EVENT
> 2
> +#define ACTION_SERIAL
> 3
> +#define ACTION_DELAY
> 4
> +#define ACTION_RUN_SCRIPT
> 5
> +#define ACTION_REMARKS
> 6
> +
> +/*
> + * * BRF Firmware header
> + * */
> +struct bts_header {
> + uint32_t magic;
> + uint32_t version;
> + uint8_t future[24];
> + uint8_t actions[0];
> +} __attribute__ ((packed));
> +
> +/*
> + * * BRF Actions structure
> + * */
> +struct bts_action {
> + uint16_t type;
> + uint16_t size;
> + uint8_t data[0];
> +} __attribute__ ((packed));
> +
> +struct bts_action_send {
> + uint8_t data[0];
> +} __attribute__ ((packed));
> +
> +struct bts_action_wait {
> + uint32_t msec;
> + uint32_t size;
> + uint8_t data[0];
> +} __attribute__ ((packed));
> +
> +struct bts_action_delay {
> + uint32_t msec;
> +} __attribute__ ((packed));
> +
> +struct bts_action_serial {
> + uint32_t baud;
> + uint32_t flow_control;
> +} __attribute__ ((packed));
> +
> +/* for identifying the change speed HCI VS
> + * command
> + */
> +struct hci_command {
> + uint8_t prefix;
> + uint16_t opcode;
> + uint8_t plen;
> + uint32_t speed;
> +} __attribute__ ((packed));
> +
> +
> +#endif /* ST_KIM_H */
> --
> 1.5.4.3
>
> --
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Now, my user-space daemon doesn't need the sysfs entry to write it's PID, from user-space, I open the /dev/rfkill device and ppoll on it, to receive events, upon receiving them I can install/un-install the ldisc based on the blocked or non-blocked state.
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