--- /dev/null
+/*
+ * Shared Transport Line discipline driver Core
+ * Init Manager module responsible for GPIO control
+ * and firmware download
+ * Copyright (C) 2009-2010 Texas Instruments
+ * Author: Pavan Savoy <pavan_savoy@ti.com>
+ *
+ * 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
+ *
+ */
+
+#define pr_fmt(fmt) "(stk) :" fmt
+#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/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/sched.h>
+#include <linux/sysfs.h>
+#include <linux/tty.h>
+
+#include <linux/skbuff.h>
+#include <linux/ti_wilink_st.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */
+static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
+
+/**********************************************************************/
+/* internal functions */
+
+struct ti_st_plat_data *dt_pdata;
+static struct ti_st_plat_data *get_platform_data(struct device *dev);
+
+/**
+ * st_get_plat_device -
+ * function which returns the reference to the platform device
+ * requested by id. As of now only 1 such device exists (id=0)
+ * the context requesting for reference can get the id to be
+ * requested by a. The protocol driver which is registering or
+ * b. the tty device which is opened.
+ */
+static struct platform_device *st_get_plat_device(int id)
+{
+ return st_kim_devices[id];
+}
+
+/**
+ * validate_firmware_response -
+ * function to return whether the firmware response was proper
+ * in case of error don't complete so that waiting for proper
+ * response times out
+ */
+static void validate_firmware_response(struct kim_data_s *kim_gdata)
+{
+ struct sk_buff *skb = kim_gdata->rx_skb;
+ if (!skb)
+ return;
+
+ /* these magic numbers are the position in the response buffer which
+ * allows us to distinguish whether the response is for the read
+ * version info. command
+ */
+ if (skb->data[2] == 0x01 && skb->data[3] == 0x01 &&
+ skb->data[4] == 0x10 && skb->data[5] == 0x00) {
+ /* fw version response */
+ memcpy(kim_gdata->resp_buffer,
+ kim_gdata->rx_skb->data,
+ kim_gdata->rx_skb->len);
+ complete_all(&kim_gdata->kim_rcvd);
+ kim_gdata->rx_state = ST_W4_PACKET_TYPE;
+ kim_gdata->rx_skb = NULL;
+ kim_gdata->rx_count = 0;
+ } else if (unlikely(skb->data[5] != 0)) {
+ pr_err("no proper response during fw download");
+ pr_err("data6 %x", skb->data[5]);
+ kfree_skb(skb);
+ 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(struct kim_data_s *kim_gdata, int len)
+{
+ register int room = skb_tailroom(kim_gdata->rx_skb);
+
+ pr_debug("len %d room %d", len, room);
+
+ if (!len) {
+ validate_firmware_response(kim_gdata);
+ } else if (len > room) {
+ /* Received packet's payload length is larger.
+ * We can't accommodate it in created skb.
+ */
+ pr_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_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;
+}
+
+/**
+ * kim_int_recv - 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
+ */
+static void kim_int_recv(struct kim_data_s *kim_gdata,
+ const unsigned char *data, long count)
+{
+ const unsigned char *ptr;
+ int len = 0, type = 0;
+ unsigned char *plen;
+
+ pr_debug("%s", __func__);
+ /* Decode received bytes here */
+ ptr = data;
+ if (unlikely(ptr == NULL)) {
+ pr_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_W4_DATA:
+ pr_debug("Complete pkt received");
+ validate_firmware_response(kim_gdata);
+ kim_gdata->rx_state = ST_W4_PACKET_TYPE;
+ kim_gdata->rx_skb = NULL;
+ continue;
+ /* Waiting for Bluetooth event header ? */
+ case ST_W4_HEADER:
+ plen =
+ (unsigned char *)&kim_gdata->rx_skb->data[1];
+ pr_debug("event hdr: plen 0x%02x\n", *plen);
+ kim_check_data_len(kim_gdata, *plen);
+ continue;
+ } /* end of switch */
+ } /* end of if rx_state */
+ switch (*ptr) {
+ /* Bluetooth event packet? */
+ case 0x04:
+ kim_gdata->rx_state = ST_W4_HEADER;
+ kim_gdata->rx_count = 2;
+ type = *ptr;
+ break;
+ default:
+ pr_info("unknown packet");
+ ptr++;
+ count--;
+ continue;
+ }
+ ptr++;
+ count--;
+ kim_gdata->rx_skb =
+ alloc_skb(1024+8, GFP_ATOMIC);
+ if (!kim_gdata->rx_skb) {
+ pr_err("can't allocate mem for new packet");
+ kim_gdata->rx_state = ST_W4_PACKET_TYPE;
+ kim_gdata->rx_count = 0;
+ return;
+ }
+ skb_reserve(kim_gdata->rx_skb, 8);
+ kim_gdata->rx_skb->cb[0] = 4;
+ kim_gdata->rx_skb->cb[1] = 0;
+
+ }
+ return;
+}
+
+static long read_local_version(struct kim_data_s *kim_gdata, char *bts_scr_name)
+{
+ unsigned short version = 0, chip = 0, min_ver = 0, maj_ver = 0;
+ const char read_ver_cmd[] = { 0x01, 0x01, 0x10, 0x00 };
+ long timeout;
+
+ pr_debug("%s", __func__);
+
+ reinit_completion(&kim_gdata->kim_rcvd);
+ if (4 != st_int_write(kim_gdata->core_data, read_ver_cmd, 4)) {
+ pr_err("kim: couldn't write 4 bytes");
+ return -EIO;
+ }
+
+ timeout = wait_for_completion_interruptible_timeout(
+ &kim_gdata->kim_rcvd, msecs_to_jiffies(CMD_RESP_TIME));
+ if (timeout <= 0) {
+ pr_err(" waiting for ver info- timed out or received signal");
+ return timeout ? -ERESTARTSYS : -ETIMEDOUT;
+ }
+ reinit_completion(&kim_gdata->kim_rcvd);
+ /* the positions 12 & 13 in the response buffer provide with the
+ * chip, major & minor numbers
+ */
+
+ version =
+ MAKEWORD(kim_gdata->resp_buffer[12],
+ kim_gdata->resp_buffer[13]);
+ chip = (version & 0x7C00) >> 10;
+ min_ver = (version & 0x007F);
+ maj_ver = (version & 0x0380) >> 7;
+
+ if (version & 0x8000)
+ maj_ver |= 0x0008;
+
+ sprintf(bts_scr_name, "ti-connectivity/TIInit_%d.%d.%d.bts",
+ chip, maj_ver, min_ver);
+
+ /* to be accessed later via sysfs entry */
+ kim_gdata->version.full = version;
+ kim_gdata->version.chip = chip;
+ kim_gdata->version.maj_ver = maj_ver;
+ kim_gdata->version.min_ver = min_ver;
+
+ pr_info("%s", bts_scr_name);
+ return 0;
+}
+
+static void skip_change_remote_baud(unsigned char **ptr, long *len)
+{
+ unsigned char *nxt_action, *cur_action;
+ cur_action = *ptr;
+
+ nxt_action = cur_action + sizeof(struct bts_action) +
+ ((struct bts_action *) cur_action)->size;
+
+ if (((struct bts_action *) nxt_action)->type != ACTION_WAIT_EVENT) {
+ pr_err("invalid action after change remote baud command");
+ } else {
+ *ptr = *ptr + sizeof(struct bts_action) +
+ ((struct bts_action *)cur_action)->size;
+ *len = *len - (sizeof(struct bts_action) +
+ ((struct bts_action *)cur_action)->size);
+ /* warn user on not commenting these in firmware */
+ pr_warn("skipping the wait event of change remote baud");
+ }
+}
+
+/**
+ * download_firmware -
+ * internal function which parses through the .bts firmware
+ * script file intreprets SEND, DELAY actions only as of now
+ */
+static long download_firmware(struct kim_data_s *kim_gdata)
+{
+ long err = 0;
+ long len = 0;
+ unsigned char *ptr = NULL;
+ unsigned char *action_ptr = NULL;
+ unsigned char bts_scr_name[40] = { 0 }; /* 40 char long bts scr name? */
+ int wr_room_space;
+ int cmd_size;
+ unsigned long timeout;
+
+ err = read_local_version(kim_gdata, bts_scr_name);
+ if (err != 0) {
+ pr_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))) {
+ pr_err(" request_firmware failed(errno %ld) for %s", err,
+ bts_scr_name);
+ return -EINVAL;
+ }
+ 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) {
+ pr_debug(" 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 */
+ pr_debug("S");
+ 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 */
+ pr_warn("change remote baud"
+ " rate command in firmware");
+ skip_change_remote_baud(&ptr, &len);
+ break;
+ }
+ /*
+ * Make sure we have enough free space in uart
+ * tx buffer to write current firmware command
+ */
+ cmd_size = ((struct bts_action *)ptr)->size;
+ timeout = jiffies + msecs_to_jiffies(CMD_WR_TIME);
+ do {
+ wr_room_space =
+ st_get_uart_wr_room(kim_gdata->core_data);
+ if (wr_room_space < 0) {
+ pr_err("Unable to get free "
+ "space info from uart tx buffer");
+ release_firmware(kim_gdata->fw_entry);
+ return wr_room_space;
+ }
+ mdelay(1); /* wait 1ms before checking room */
+ } while ((wr_room_space < cmd_size) &&
+ time_before(jiffies, timeout));
+
+ /* Timeout happened ? */
+ if (time_after_eq(jiffies, timeout)) {
+ pr_err("Timeout while waiting for free "
+ "free space in uart tx buffer");
+ release_firmware(kim_gdata->fw_entry);
+ return -ETIMEDOUT;
+ }
+ /* reinit completion before sending for the
+ * relevant wait
+ */
+ reinit_completion(&kim_gdata->kim_rcvd);
+
+ /*
+ * Free space found in uart buffer, call st_int_write
+ * to send current firmware command to the uart tx
+ * buffer.
+ */
+ err = st_int_write(kim_gdata->core_data,
+ ((struct bts_action_send *)action_ptr)->data,
+ ((struct bts_action *)ptr)->size);
+ if (unlikely(err < 0)) {
+ release_firmware(kim_gdata->fw_entry);
+ return err;
+ }
+ /*
+ * Check number of bytes written to the uart tx buffer
+ * and requested command write size
+ */
+ if (err != cmd_size) {
+ pr_err("Number of bytes written to uart "
+ "tx buffer are not matching with "
+ "requested cmd write size");
+ release_firmware(kim_gdata->fw_entry);
+ return -EIO;
+ }
+ break;
+ case ACTION_WAIT_EVENT: /* wait */
+ pr_debug("W");
+ err = wait_for_completion_interruptible_timeout(
+ &kim_gdata->kim_rcvd,
+ msecs_to_jiffies(CMD_RESP_TIME));
+ if (err <= 0) {
+ pr_err("response timeout/signaled during fw download ");
+ /* timed out */
+ release_firmware(kim_gdata->fw_entry);
+ return err ? -ERESTARTSYS : -ETIMEDOUT;
+ }
+ reinit_completion(&kim_gdata->kim_rcvd);
+ break;
+ case ACTION_DELAY: /* sleep */
+ pr_info("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 0;
+}
+
+/**********************************************************************/
+/* functions called from ST core */
+/* 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(void *disc_data, const unsigned char *data, long count)
+{
+ struct st_data_s *st_gdata = (struct st_data_s *)disc_data;
+ struct kim_data_s *kim_gdata = st_gdata->kim_data;
+
+ /* proceed to gather all data and distinguish read fw version response
+ * from other fw responses when data gathering is complete
+ */
+ kim_int_recv(kim_gdata, data, count);
+ return;
+}
+
+/* to signal completion of line discipline installation
+ * called from ST Core, upon tty_open
+ */
+void st_kim_complete(void *kim_data)
+{
+ struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
+ complete(&kim_gdata->ldisc_installed);
+}
+
+/**
+ * st_kim_start - called from ST Core upon 1st registration
+ * This involves toggling the chip enable gpio, reading
+ * the firmware version from chip, forming the fw file name
+ * based on the chip version, requesting the fw, parsing it
+ * and perform download(send/recv).
+ */
+long st_kim_start(void *kim_data)
+{
+ long err = 0;
+ long retry = POR_RETRY_COUNT;
+ struct ti_st_plat_data *pdata;
+ struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
+
+ pr_info(" %s", __func__);
+ if (kim_gdata->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = kim_gdata->kim_pdev->dev.platform_data;
+ }
+
+ do {
+ /* platform specific enabling code here */
+ if (pdata->chip_enable)
+ pdata->chip_enable(kim_gdata);
+
+ /* Configure BT nShutdown to HIGH state */
+ gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
+ mdelay(5); /* FIXME: a proper toggle */
+ gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
+ mdelay(100);
+ /* re-initialize the completion */
+ reinit_completion(&kim_gdata->ldisc_installed);
+ /* send notification to UIM */
+ kim_gdata->ldisc_install = 1;
+ pr_info("ldisc_install = 1");
+ sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
+ NULL, "install");
+ /* wait for ldisc to be installed */
+ err = wait_for_completion_interruptible_timeout(
+ &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
+ if (!err) {
+ /* ldisc installation timeout,
+ * flush uart, power cycle BT_EN */
+ pr_err("ldisc installation timeout");
+ err = st_kim_stop(kim_gdata);
+ continue;
+ } else {
+ /* ldisc installed now */
+ pr_info("line discipline installed");
+ err = download_firmware(kim_gdata);
+ if (err != 0) {
+ /* ldisc installed but fw download failed,
+ * flush uart & power cycle BT_EN */
+ pr_err("download firmware failed");
+ err = st_kim_stop(kim_gdata);
+ continue;
+ } else { /* on success don't retry */
+ break;
+ }
+ }
+ } while (retry--);
+ return err;
+}
+
+/**
+ * st_kim_stop - stop communication with chip.
+ * This can be called from ST Core/KIM, on the-
+ * (a) last un-register when chip need not be powered there-after,
+ * (b) upon failure to either install ldisc or download firmware.
+ * The function is responsible to (a) notify UIM about un-installation,
+ * (b) flush UART if the ldisc was installed.
+ * (c) reset BT_EN - pull down nshutdown at the end.
+ * (d) invoke platform's chip disabling routine.
+ */
+long st_kim_stop(void *kim_data)
+{
+ long err = 0;
+ struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
+ struct ti_st_plat_data *pdata;
+ struct tty_struct *tty = kim_gdata->core_data->tty;
+
+ reinit_completion(&kim_gdata->ldisc_installed);
+
+ if (kim_gdata->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else
+ pdata = kim_gdata->kim_pdev->dev.platform_data;
+
+
+ if (tty) { /* can be called before ldisc is installed */
+ /* Flush any pending characters in the driver and discipline. */
+ tty_ldisc_flush(tty);
+ tty_driver_flush_buffer(tty);
+ }
+
+ /* send uninstall notification to UIM */
+ pr_info("ldisc_install = 0");
+ kim_gdata->ldisc_install = 0;
+ sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, NULL, "install");
+
+ /* wait for ldisc to be un-installed */
+ err = wait_for_completion_interruptible_timeout(
+ &kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME));
+ if (!err) { /* timeout */
+ pr_err(" timed out waiting for ldisc to be un-installed");
+ err = -ETIMEDOUT;
+ }
+
+ /* By default configure BT nShutdown to LOW state */
+ gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
+ mdelay(1);
+ gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
+ mdelay(1);
+ gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
+
+ /* platform specific disable */
+ if (pdata->chip_disable)
+ pdata->chip_disable(kim_gdata);
+ return err;
+}
+
+/**********************************************************************/
+/* functions called from subsystems */
+/* called when debugfs entry is read from */
+
+static int show_version(struct seq_file *s, void *unused)
+{
+ struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
+ seq_printf(s, "%04X %d.%d.%d\n", kim_gdata->version.full,
+ kim_gdata->version.chip, kim_gdata->version.maj_ver,
+ kim_gdata->version.min_ver);
+ return 0;
+}
+
+static int show_list(struct seq_file *s, void *unused)
+{
+ struct kim_data_s *kim_gdata = (struct kim_data_s *)s->private;
+ kim_st_list_protocols(kim_gdata->core_data, s);
+ return 0;
+}
+
+static ssize_t show_install(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", kim_data->ldisc_install);
+}
+
+#ifdef DEBUG
+static ssize_t store_dev_name(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ pr_debug("storing dev name >%s<", buf);
+ strncpy(kim_data->dev_name, buf, count);
+ pr_debug("stored dev name >%s<", kim_data->dev_name);
+ return count;
+}
+
+static ssize_t store_baud_rate(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ pr_debug("storing baud rate >%s<", buf);
+ sscanf(buf, "%ld", &kim_data->baud_rate);
+ pr_debug("stored baud rate >%ld<", kim_data->baud_rate);
+ return count;
+}
+#endif /* if DEBUG */
+
+static ssize_t show_dev_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n", kim_data->dev_name);
+}
+
+static ssize_t show_baud_rate(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", kim_data->baud_rate);
+}
+
+static ssize_t show_flow_cntrl(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kim_data_s *kim_data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", kim_data->flow_cntrl);
+}
+
+/* structures specific for sysfs entries */
+static struct kobj_attribute ldisc_install =
+__ATTR(install, 0444, (void *)show_install, NULL);
+
+static struct kobj_attribute uart_dev_name =
+#ifdef DEBUG /* TODO: move this to debug-fs if possible */
+__ATTR(dev_name, 0644, (void *)show_dev_name, (void *)store_dev_name);
+#else
+__ATTR(dev_name, 0444, (void *)show_dev_name, NULL);
+#endif
+
+static struct kobj_attribute uart_baud_rate =
+#ifdef DEBUG /* TODO: move to debugfs */
+__ATTR(baud_rate, 0644, (void *)show_baud_rate, (void *)store_baud_rate);
+#else
+__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL);
+#endif
+
+static struct kobj_attribute uart_flow_cntrl =
+__ATTR(flow_cntrl, 0444, (void *)show_flow_cntrl, NULL);
+
+static struct attribute *uim_attrs[] = {
+ &ldisc_install.attr,
+ &uart_dev_name.attr,
+ &uart_baud_rate.attr,
+ &uart_flow_cntrl.attr,
+ NULL,
+};
+
+static struct attribute_group uim_attr_grp = {
+ .attrs = uim_attrs,
+};
+
+/**
+ * st_kim_ref - reference the core's data
+ * This references the per-ST platform device in the arch/xx/
+ * board-xx.c file.
+ * This would enable multiple such platform devices to exist
+ * on a given platform
+ */
+void st_kim_ref(struct st_data_s **core_data, int id)
+{
+ struct platform_device *pdev;
+ struct kim_data_s *kim_gdata;
+ /* get kim_gdata reference from platform device */
+ pdev = st_get_plat_device(id);
+ if (!pdev)
+ goto err;
+ kim_gdata = platform_get_drvdata(pdev);
+ if (!kim_gdata)
+ goto err;
+
+ *core_data = kim_gdata->core_data;
+ return;
+err:
+ *core_data = NULL;
+}
+
+static int kim_version_open(struct inode *i, struct file *f)
+{
+ return single_open(f, show_version, i->i_private);
+}
+
+static int kim_list_open(struct inode *i, struct file *f)
+{
+ return single_open(f, show_list, i->i_private);
+}
+
+static const struct file_operations version_debugfs_fops = {
+ /* version info */
+ .open = kim_version_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+static const struct file_operations list_debugfs_fops = {
+ /* protocols info */
+ .open = kim_list_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/**********************************************************************/
+/* functions called from platform device driver subsystem
+ * need to have a relevant platform device entry in the platform's
+ * board-*.c file
+ */
+
+static const struct of_device_id kim_of_match[] = {
+{
+ .compatible = "kim",
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, kim_of_match);
+
+static struct ti_st_plat_data *get_platform_data(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ const u32 *dt_property;
+ int len;
+
+ dt_pdata = kzalloc(sizeof(*dt_pdata), GFP_KERNEL);
+
+ if (!dt_pdata)
+ pr_err("Can't allocate device_tree platform data\n");
+
+ dt_property = of_get_property(np, "dev_name", &len);
+ if (dt_property)
+ memcpy(&dt_pdata->dev_name, dt_property, len);
+ of_property_read_u32(np, "nshutdown_gpio",
+ &dt_pdata->nshutdown_gpio);
+ of_property_read_u32(np, "flow_cntrl", &dt_pdata->flow_cntrl);
+ of_property_read_u32(np, "baud_rate", &dt_pdata->baud_rate);
+
+ return dt_pdata;
+}
+
+static struct dentry *kim_debugfs_dir;
+static int kim_probe(struct platform_device *pdev)
+{
+ struct kim_data_s *kim_gdata;
+ struct ti_st_plat_data *pdata;
+ int err;
+
+ if (pdev->dev.of_node)
+ pdata = get_platform_data(&pdev->dev);
+ else
+ pdata = pdev->dev.platform_data;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Platform Data is missing\n");
+ return -ENXIO;
+ }
+
+ if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
+ /* multiple devices could exist */
+ st_kim_devices[pdev->id] = pdev;
+ } else {
+ /* platform's sure about existence of 1 device */
+ st_kim_devices[0] = pdev;
+ }
+
+ kim_gdata = kzalloc(sizeof(struct kim_data_s), GFP_ATOMIC);
+ if (!kim_gdata) {
+ pr_err("no mem to allocate");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pdev, kim_gdata);
+
+ err = st_core_init(&kim_gdata->core_data);
+ if (err != 0) {
+ pr_err(" ST core init failed");
+ err = -EIO;
+ goto err_core_init;
+ }
+ /* refer to itself */
+ kim_gdata->core_data->kim_data = kim_gdata;
+
+ /* Claim the chip enable nShutdown gpio from the system */
+ kim_gdata->nshutdown = pdata->nshutdown_gpio;
+ err = gpio_request(kim_gdata->nshutdown, "kim");
+ if (unlikely(err)) {
+ pr_err(" gpio %d request failed ", kim_gdata->nshutdown);
+ return err;
+ }
+
+ /* Configure nShutdown GPIO as output=0 */
+ err = gpio_direction_output(kim_gdata->nshutdown, 0);
+ if (unlikely(err)) {
+ pr_err(" unable to configure gpio %d", kim_gdata->nshutdown);
+ return err;
+ }
+ /* get reference of pdev for request_firmware
+ */
+ kim_gdata->kim_pdev = pdev;
+ init_completion(&kim_gdata->kim_rcvd);
+ init_completion(&kim_gdata->ldisc_installed);
+
+ err = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp);
+ if (err) {
+ pr_err("failed to create sysfs entries");
+ goto err_sysfs_group;
+ }
+
+ /* copying platform data */
+ strncpy(kim_gdata->dev_name, pdata->dev_name, UART_DEV_NAME_LEN);
+ kim_gdata->flow_cntrl = pdata->flow_cntrl;
+ kim_gdata->baud_rate = pdata->baud_rate;
+ pr_info("sysfs entries created\n");
+
+ kim_debugfs_dir = debugfs_create_dir("ti-st", NULL);
+ if (!kim_debugfs_dir) {
+ pr_err(" debugfs entries creation failed ");
+ return 0;
+ }
+
+ debugfs_create_file("version", S_IRUGO, kim_debugfs_dir,
+ kim_gdata, &version_debugfs_fops);
+ debugfs_create_file("protocols", S_IRUGO, kim_debugfs_dir,
+ kim_gdata, &list_debugfs_fops);
+ return 0;
+
+err_sysfs_group:
+ st_core_exit(kim_gdata->core_data);
+
+err_core_init:
+ kfree(kim_gdata);
+
+ return err;
+}
+
+static int kim_remove(struct platform_device *pdev)
+{
+ /* free the GPIOs requested */
+ struct ti_st_plat_data *pdata;
+ struct kim_data_s *kim_gdata;
+
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
+ kim_gdata = platform_get_drvdata(pdev);
+
+ /* Free the Bluetooth/FM/GPIO
+ * nShutdown gpio from the system
+ */
+ gpio_free(pdata->nshutdown_gpio);
+ pr_info("nshutdown GPIO Freed");
+
+ debugfs_remove_recursive(kim_debugfs_dir);
+ sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp);
+ pr_info("sysfs entries removed");
+
+ kim_gdata->kim_pdev = NULL;
+ st_core_exit(kim_gdata->core_data);
+
+ kfree(kim_gdata);
+ kim_gdata = NULL;
+ kfree(dt_pdata);
+ dt_pdata = NULL;
+
+ return 0;
+}
+
+static int kim_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct ti_st_plat_data *pdata;
+
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
+ if (pdata->suspend)
+ return pdata->suspend(pdev, state);
+
+ return 0;
+}
+
+static int kim_resume(struct platform_device *pdev)
+{
+ struct ti_st_plat_data *pdata;
+
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
+ if (pdata->resume)
+ return pdata->resume(pdev);
+
+ return 0;
+}
+
+/**********************************************************************/
+/* entry point for ST KIM module, called in from ST Core */
+static struct platform_driver kim_platform_driver = {
+ .probe = kim_probe,
+ .remove = kim_remove,
+ .suspend = kim_suspend,
+ .resume = kim_resume,
+ .driver = {
+ .name = "kim",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(kim_of_match),
+ },
+};
+
+module_platform_driver(kim_platform_driver);
+
+MODULE_AUTHOR("Pavan Savoy <pavan_savoy@ti.com>");
+MODULE_DESCRIPTION("Shared Transport Driver for TI BT/FM/GPS combo chips ");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff