diff options
author | Pavan Savoy <pavan_savoy@ti.com> | 2011-02-04 02:23:10 -0600 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-04 12:41:20 -0800 |
commit | ec60d0ad20ff8796dc41b30a9dce485478ccd263 (patch) | |
tree | 9a0a96e59fb0f193ad25177a54fe16612e2f8545 /drivers | |
parent | 5c88b02196a99332dacf305c8757674dd7a303ff (diff) | |
download | linux-ec60d0ad20ff8796dc41b30a9dce485478ccd263.tar.bz2 |
drivers:misc: ti-st: move from rfkill to sysfs
The communication between ST KIM and UIM was interfaced
over the /dev/rfkill device node.
Move the interface to a simpler less abusive sysfs entry
mechanism and document it in Documentation/ABI/testing/
under sysfs-platform-kim.
Shared transport driver would now read the UART details
originally received by bootloader or firmware as platform
data.
The data read will be shared over sysfs entries for the user-space
UIM or other n/w manager/plugins to be read, and assist the driver
by opening up the UART, setting the baud-rate and installing the
line discipline.
Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/misc/ti-st/st_kim.c | 244 |
1 files changed, 121 insertions, 123 deletions
diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c index 707c85826417..a7fda8141758 100644 --- a/drivers/misc/ti-st/st_kim.c +++ b/drivers/misc/ti-st/st_kim.c @@ -30,46 +30,12 @@ #include <linux/debugfs.h> #include <linux/seq_file.h> #include <linux/sched.h> -#include <linux/rfkill.h> +#include <linux/tty.h> #include <linux/skbuff.h> #include <linux/ti_wilink_st.h> -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, - }, -}; - -static int kim_toggle_radio(void*, bool); -static const struct rfkill_ops kim_rfkill_ops = { - .set_block = kim_toggle_radio, -}; - -/* 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"), -}; - #define MAX_ST_DEVICES 3 /* Imagine 1 on each UART for now */ static struct platform_device *st_kim_devices[MAX_ST_DEVICES]; @@ -371,8 +337,7 @@ void st_kim_chip_toggle(enum proto_type type, enum kim_gpio_state state) kim_gdata = dev_get_drvdata(&kim_pdev->dev); if (kim_gdata->gpios[type] == -1) { - pr_info(" gpio not requested for protocol %s", - protocol_names[type]); + pr_info("gpio not requested for protocol %d", type); return; } switch (type) { @@ -450,11 +415,6 @@ long st_kim_start(void *kim_data) pr_info(" %s", __func__); do { - /* TODO: this is only because rfkill sub-system - * doesn't send events to user-space if the state - * isn't changed - */ - rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1); /* Configure BT nShutdown to HIGH state */ gpio_set_value(kim_gdata->gpios[ST_BT], GPIO_LOW); mdelay(5); /* FIXME: a proper toggle */ @@ -462,22 +422,20 @@ long st_kim_start(void *kim_data) mdelay(100); /* re-initialize the completion */ INIT_COMPLETION(kim_gdata->ldisc_installed); -#if 0 /* older way of signalling user-space UIM */ - /* send signal to UIM */ - err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 0); - if (err != 0) { - pr_info(" sending SIGUSR2 to uim failed %ld", err); - err = -1; - continue; - } -#endif - /* unblock and send event to UIM via /dev/rfkill */ - rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 0); + /* 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_timeout(&kim_gdata->ldisc_installed, msecs_to_jiffies(LDISC_TIME)); if (!err) { /* timeout */ pr_err("line disc installation timed out "); + kim_gdata->ldisc_install = 0; + pr_info("ldisc_install = 0"); + sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, + NULL, "install"); err = -1; continue; } else { @@ -486,6 +444,10 @@ long st_kim_start(void *kim_data) err = download_firmware(kim_gdata); if (err != 0) { pr_err("download firmware failed"); + kim_gdata->ldisc_install = 0; + pr_info("ldisc_install = 0"); + sysfs_notify(&kim_gdata->kim_pdev->dev.kobj, + NULL, "install"); continue; } else { /* on success don't retry */ break; @@ -505,16 +467,15 @@ long st_kim_stop(void *kim_data) struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data; INIT_COMPLETION(kim_gdata->ldisc_installed); -#if 0 /* older way of signalling user-space UIM */ - /* send signal to UIM */ - err = kill_pid(find_get_pid(kim_gdata->uim_pid), SIGUSR2, 1); - if (err != 0) { - pr_err("sending SIGUSR2 to uim failed %ld", err); - return -1; - } -#endif - /* set BT rfkill to be blocked */ - err = rfkill_set_hw_state(kim_gdata->rfkill[ST_BT], 1); + + /* Flush any pending characters in the driver and discipline. */ + tty_ldisc_flush(kim_gdata->core_data->tty); + tty_driver_flush_buffer(kim_gdata->core_data->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_timeout(&kim_gdata->ldisc_installed, @@ -553,33 +514,59 @@ static int show_list(struct seq_file *s, void *unused) return 0; } -/* 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) +static ssize_t show_install(struct device *dev, + struct device_attribute *attr, char *buf) { - enum proto_type type = *((enum proto_type *)data); - pr_debug(" %s: %d ", __func__, type); + struct kim_data_s *kim_data = dev_get_drvdata(dev); + return sprintf(buf, "%d\n", kim_data->ldisc_install); +} - 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_CHANNELS: - pr_err(" wrong proto type "); - break; - } - return 0; +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, "%ld\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 = +__ATTR(dev_name, 0444, (void *)show_dev_name, NULL); + +static struct kobj_attribute uart_baud_rate = +__ATTR(baud_rate, 0444, (void *)show_baud_rate, NULL); + +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/ @@ -633,8 +620,9 @@ static int kim_probe(struct platform_device *pdev) { long status; long proto; - long *gpios = pdev->dev.platform_data; struct kim_data_s *kim_gdata; + struct ti_st_plat_data *pdata = pdev->dev.platform_data; + long *gpios = pdata->gpios; if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) { /* multiple devices could exist */ @@ -700,30 +688,18 @@ static int kim_probe(struct platform_device *pdev) init_completion(&kim_gdata->kim_rcvd); init_completion(&kim_gdata->ldisc_installed); - for (proto = 0; (proto < ST_MAX_CHANNELS) - && (gpios[proto] != -1); proto++) { - /* TODO: should all types be rfkill_type_bt ? */ - kim_gdata->rf_protos[proto] = proto; - kim_gdata->rfkill[proto] = rfkill_alloc(protocol_names[proto], - &pdev->dev, RFKILL_TYPE_BLUETOOTH, - &kim_rfkill_ops, &kim_gdata->rf_protos[proto]); - if (kim_gdata->rfkill[proto] == NULL) { - pr_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)) { - pr_err("rfkill registration failed for gpio %ld", - gpios[proto]); - rfkill_unregister(kim_gdata->rfkill[proto]); - continue; - } - pr_info("rfkill entry created for %ld", gpios[proto]); + status = sysfs_create_group(&pdev->dev.kobj, &uim_attr_grp); + if (status) { + pr_err("failed to create sysfs entries"); + return status; } + /* 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 (IS_ERR(kim_debugfs_dir)) { pr_err(" debugfs entries creation failed "); @@ -741,9 +717,9 @@ static int kim_probe(struct platform_device *pdev) static int kim_remove(struct platform_device *pdev) { - /* free the GPIOs requested - */ - long *gpios = pdev->dev.platform_data; + /* free the GPIOs requested */ + struct ti_st_plat_data *pdata = pdev->dev.platform_data; + long *gpios = pdata->gpios; long proto; struct kim_data_s *kim_gdata; @@ -755,12 +731,11 @@ static int kim_remove(struct platform_device *pdev) * nShutdown gpio from the system */ gpio_free(gpios[proto]); - rfkill_unregister(kim_gdata->rfkill[proto]); - rfkill_destroy(kim_gdata->rfkill[proto]); - kim_gdata->rfkill[proto] = NULL; } pr_info("kim: GPIO Freed"); debugfs_remove_recursive(kim_debugfs_dir); + + sysfs_remove_group(&pdev->dev.kobj, &uim_attr_grp); kim_gdata->kim_pdev = NULL; st_core_exit(kim_gdata->core_data); @@ -769,23 +744,46 @@ static int kim_remove(struct platform_device *pdev) return 0; } +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 -EOPNOTSUPP; +} + +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 -EOPNOTSUPP; +} + /**********************************************************************/ /* 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, + }, +}; static int __init st_kim_init(void) { - long ret = 0; - ret = platform_driver_register(&kim_platform_driver); - if (ret != 0) { - pr_err("platform drv registration failed"); - return -1; - } - return 0; + return platform_driver_register(&kim_platform_driver); } static void __exit st_kim_deinit(void) { - /* the following returns void */ platform_driver_unregister(&kim_platform_driver); } |