| /* |
| * 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> |
| |
| #define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */ |
| static struct platform_device *st_kim_devices[MAX_ST_DEVICES]; |
| |
| /**********************************************************************/ |
| /* internal functions */ |
| |
| /** |
| * 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); |
| 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); |
| skb_put_data(kim_gdata->rx_skb, 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__); |
| 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_cansleep(kim_gdata->nshutdown, GPIO_LOW); |
| mdelay(5); /* FIXME: a proper toggle */ |
| gpio_set_value_cansleep(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 = |
| kim_gdata->kim_pdev->dev.platform_data; |
| struct tty_struct *tty = kim_gdata->core_data->tty; |
| |
| reinit_completion(&kim_gdata->ldisc_installed); |
| |
| 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_cansleep(kim_gdata->nshutdown, GPIO_LOW); |
| mdelay(1); |
| gpio_set_value_cansleep(kim_gdata->nshutdown, GPIO_HIGH); |
| mdelay(1); |
| gpio_set_value_cansleep(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 const 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 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 = pdev->dev.platform_data; |
| int err; |
| |
| 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); |
| goto err_sysfs_group; |
| } |
| |
| /* 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); |
| goto err_sysfs_group; |
| } |
| /* 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 = pdev->dev.platform_data; |
| struct kim_data_s *kim_gdata; |
| |
| 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; |
| return 0; |
| } |
| |
| static int kim_suspend(struct platform_device *pdev, pm_message_t state) |
| { |
| struct ti_st_plat_data *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 = 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", |
| }, |
| }; |
| |
| 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"); |