![Uwe Kleine-König](/assets/img/avatar_default.png)
Since 39b2bbe3d7
(gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.
Use this to simplify the driver. Furthermore this is one caller less
that stops us making the flags argument to gpiod_get*() mandatory.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
315 lines
7.7 KiB
C
315 lines
7.7 KiB
C
/*
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* nokia-modem.c
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*
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* HSI client driver for Nokia N900 modem.
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*
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* Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/hsi/hsi.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <linux/hsi/ssi_protocol.h>
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static unsigned int pm = 1;
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module_param(pm, int, 0400);
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MODULE_PARM_DESC(pm,
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"Enable power management (0=disabled, 1=userland based [default])");
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struct nokia_modem_gpio {
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struct gpio_desc *gpio;
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const char *name;
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};
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struct nokia_modem_device {
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struct tasklet_struct nokia_modem_rst_ind_tasklet;
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int nokia_modem_rst_ind_irq;
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struct device *device;
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struct nokia_modem_gpio *gpios;
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int gpio_amount;
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struct hsi_client *ssi_protocol;
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struct hsi_client *cmt_speech;
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};
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static void do_nokia_modem_rst_ind_tasklet(unsigned long data)
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{
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struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
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if (!modem)
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return;
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dev_info(modem->device, "CMT rst line change detected\n");
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if (modem->ssi_protocol)
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ssip_reset_event(modem->ssi_protocol);
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}
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static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data)
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{
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struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
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tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet);
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return IRQ_HANDLED;
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}
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static void nokia_modem_gpio_unexport(struct device *dev)
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{
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struct nokia_modem_device *modem = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < modem->gpio_amount; i++) {
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sysfs_remove_link(&dev->kobj, modem->gpios[i].name);
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gpiod_unexport(modem->gpios[i].gpio);
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}
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}
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static int nokia_modem_gpio_probe(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct nokia_modem_device *modem = dev_get_drvdata(dev);
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int gpio_count, gpio_name_count, i, err;
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gpio_count = of_gpio_count(np);
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if (gpio_count < 0) {
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dev_err(dev, "missing gpios: %d\n", gpio_count);
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return gpio_count;
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}
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gpio_name_count = of_property_count_strings(np, "gpio-names");
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if (gpio_count != gpio_name_count) {
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dev_err(dev, "number of gpios does not equal number of gpio names\n");
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return -EINVAL;
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}
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modem->gpios = devm_kzalloc(dev, gpio_count *
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sizeof(struct nokia_modem_gpio), GFP_KERNEL);
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if (!modem->gpios) {
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dev_err(dev, "Could not allocate memory for gpios\n");
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return -ENOMEM;
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}
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modem->gpio_amount = gpio_count;
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for (i = 0; i < gpio_count; i++) {
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modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i,
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GPIOD_OUT_LOW);
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if (IS_ERR(modem->gpios[i].gpio)) {
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dev_err(dev, "Could not get gpio %d\n", i);
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return PTR_ERR(modem->gpios[i].gpio);
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}
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err = of_property_read_string_index(np, "gpio-names", i,
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&(modem->gpios[i].name));
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if (err) {
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dev_err(dev, "Could not get gpio name %d\n", i);
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return err;
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}
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err = gpiod_export(modem->gpios[i].gpio, 0);
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if (err)
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return err;
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err = gpiod_export_link(dev, modem->gpios[i].name,
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modem->gpios[i].gpio);
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if (err)
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return err;
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}
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return 0;
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}
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static int nokia_modem_probe(struct device *dev)
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{
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struct device_node *np;
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struct nokia_modem_device *modem;
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struct hsi_client *cl = to_hsi_client(dev);
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struct hsi_port *port = hsi_get_port(cl);
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int irq, pflags, err;
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struct hsi_board_info ssip;
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struct hsi_board_info cmtspeech;
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np = dev->of_node;
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if (!np) {
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dev_err(dev, "device tree node not found\n");
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return -ENXIO;
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}
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modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL);
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if (!modem) {
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dev_err(dev, "Could not allocate memory for nokia_modem_device\n");
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return -ENOMEM;
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}
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dev_set_drvdata(dev, modem);
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modem->device = dev;
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irq = irq_of_parse_and_map(np, 0);
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if (!irq) {
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dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq);
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return -EINVAL;
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}
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modem->nokia_modem_rst_ind_irq = irq;
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pflags = irq_get_trigger_type(irq);
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tasklet_init(&modem->nokia_modem_rst_ind_tasklet,
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do_nokia_modem_rst_ind_tasklet, (unsigned long)modem);
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err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr,
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pflags, "modem_rst_ind", modem);
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if (err < 0) {
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dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n",
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irq, pflags);
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return err;
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}
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enable_irq_wake(irq);
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if(pm) {
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err = nokia_modem_gpio_probe(dev);
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if (err < 0) {
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dev_err(dev, "Could not probe GPIOs\n");
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goto error1;
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}
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}
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ssip.name = "ssi-protocol";
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ssip.tx_cfg = cl->tx_cfg;
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ssip.rx_cfg = cl->rx_cfg;
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ssip.platform_data = NULL;
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ssip.archdata = NULL;
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modem->ssi_protocol = hsi_new_client(port, &ssip);
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if (!modem->ssi_protocol) {
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dev_err(dev, "Could not register ssi-protocol device\n");
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err = -ENOMEM;
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goto error2;
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}
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err = device_attach(&modem->ssi_protocol->device);
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if (err == 0) {
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dev_dbg(dev, "Missing ssi-protocol driver\n");
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err = -EPROBE_DEFER;
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goto error3;
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} else if (err < 0) {
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dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err);
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goto error3;
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}
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cmtspeech.name = "cmt-speech";
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cmtspeech.tx_cfg = cl->tx_cfg;
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cmtspeech.rx_cfg = cl->rx_cfg;
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cmtspeech.platform_data = NULL;
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cmtspeech.archdata = NULL;
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modem->cmt_speech = hsi_new_client(port, &cmtspeech);
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if (!modem->cmt_speech) {
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dev_err(dev, "Could not register cmt-speech device\n");
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err = -ENOMEM;
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goto error3;
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}
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err = device_attach(&modem->cmt_speech->device);
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if (err == 0) {
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dev_dbg(dev, "Missing cmt-speech driver\n");
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err = -EPROBE_DEFER;
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goto error4;
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} else if (err < 0) {
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dev_err(dev, "Could not load cmt-speech driver (%d)\n", err);
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goto error4;
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}
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dev_info(dev, "Registered Nokia HSI modem\n");
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return 0;
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error4:
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hsi_remove_client(&modem->cmt_speech->device, NULL);
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error3:
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hsi_remove_client(&modem->ssi_protocol->device, NULL);
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error2:
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nokia_modem_gpio_unexport(dev);
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error1:
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disable_irq_wake(modem->nokia_modem_rst_ind_irq);
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tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
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return err;
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}
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static int nokia_modem_remove(struct device *dev)
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{
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struct nokia_modem_device *modem = dev_get_drvdata(dev);
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if (!modem)
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return 0;
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if (modem->cmt_speech) {
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hsi_remove_client(&modem->cmt_speech->device, NULL);
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modem->cmt_speech = NULL;
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}
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if (modem->ssi_protocol) {
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hsi_remove_client(&modem->ssi_protocol->device, NULL);
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modem->ssi_protocol = NULL;
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}
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nokia_modem_gpio_unexport(dev);
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dev_set_drvdata(dev, NULL);
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disable_irq_wake(modem->nokia_modem_rst_ind_irq);
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tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id nokia_modem_of_match[] = {
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{ .compatible = "nokia,n900-modem", },
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{},
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};
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MODULE_DEVICE_TABLE(of, nokia_modem_of_match);
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#endif
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static struct hsi_client_driver nokia_modem_driver = {
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.driver = {
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.name = "nokia-modem",
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.owner = THIS_MODULE,
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.probe = nokia_modem_probe,
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.remove = nokia_modem_remove,
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.of_match_table = of_match_ptr(nokia_modem_of_match),
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},
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};
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static int __init nokia_modem_init(void)
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{
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return hsi_register_client_driver(&nokia_modem_driver);
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}
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module_init(nokia_modem_init);
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static void __exit nokia_modem_exit(void)
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{
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hsi_unregister_client_driver(&nokia_modem_driver);
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}
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module_exit(nokia_modem_exit);
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MODULE_ALIAS("hsi:nokia-modem");
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MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
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MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem");
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MODULE_LICENSE("GPL");
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