4 * HSI client driver for Nokia N900 modem.
6 * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 #include <linux/gpio/consumer.h>
24 #include <linux/hsi/hsi.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
28 #include <linux/of_irq.h>
29 #include <linux/of_gpio.h>
30 #include <linux/hsi/ssi_protocol.h>
32 static unsigned int pm = 1;
33 module_param(pm, int, 0400);
35 "Enable power management (0=disabled, 1=userland based [default])");
37 struct nokia_modem_gpio {
38 struct gpio_desc *gpio;
42 struct nokia_modem_device {
43 struct tasklet_struct nokia_modem_rst_ind_tasklet;
44 int nokia_modem_rst_ind_irq;
45 struct device *device;
46 struct nokia_modem_gpio *gpios;
48 struct hsi_client *ssi_protocol;
49 struct hsi_client *cmt_speech;
52 static void do_nokia_modem_rst_ind_tasklet(unsigned long data)
54 struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
59 dev_info(modem->device, "CMT rst line change detected\n");
61 if (modem->ssi_protocol)
62 ssip_reset_event(modem->ssi_protocol);
65 static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data)
67 struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
69 tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet);
74 static void nokia_modem_gpio_unexport(struct device *dev)
76 struct nokia_modem_device *modem = dev_get_drvdata(dev);
79 for (i = 0; i < modem->gpio_amount; i++) {
80 sysfs_remove_link(&dev->kobj, modem->gpios[i].name);
81 gpiod_unexport(modem->gpios[i].gpio);
85 static int nokia_modem_gpio_probe(struct device *dev)
87 struct device_node *np = dev->of_node;
88 struct nokia_modem_device *modem = dev_get_drvdata(dev);
89 int gpio_count, gpio_name_count, i, err;
91 gpio_count = of_gpio_count(np);
94 dev_err(dev, "missing gpios: %d\n", gpio_count);
98 gpio_name_count = of_property_count_strings(np, "gpio-names");
100 if (gpio_count != gpio_name_count) {
101 dev_err(dev, "number of gpios does not equal number of gpio names\n");
105 modem->gpios = devm_kcalloc(dev, gpio_count, sizeof(*modem->gpios),
110 modem->gpio_amount = gpio_count;
112 for (i = 0; i < gpio_count; i++) {
113 modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i,
115 if (IS_ERR(modem->gpios[i].gpio)) {
116 dev_err(dev, "Could not get gpio %d\n", i);
117 return PTR_ERR(modem->gpios[i].gpio);
120 err = of_property_read_string_index(np, "gpio-names", i,
121 &(modem->gpios[i].name));
123 dev_err(dev, "Could not get gpio name %d\n", i);
127 err = gpiod_export(modem->gpios[i].gpio, 0);
131 err = gpiod_export_link(dev, modem->gpios[i].name,
132 modem->gpios[i].gpio);
140 static int nokia_modem_probe(struct device *dev)
142 struct device_node *np;
143 struct nokia_modem_device *modem;
144 struct hsi_client *cl = to_hsi_client(dev);
145 struct hsi_port *port = hsi_get_port(cl);
146 int irq, pflags, err;
147 struct hsi_board_info ssip;
148 struct hsi_board_info cmtspeech;
152 dev_err(dev, "device tree node not found\n");
156 modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL);
160 dev_set_drvdata(dev, modem);
163 irq = irq_of_parse_and_map(np, 0);
165 dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq);
168 modem->nokia_modem_rst_ind_irq = irq;
169 pflags = irq_get_trigger_type(irq);
171 tasklet_init(&modem->nokia_modem_rst_ind_tasklet,
172 do_nokia_modem_rst_ind_tasklet, (unsigned long)modem);
173 err = devm_request_irq(dev, irq, nokia_modem_rst_ind_isr,
174 pflags, "modem_rst_ind", modem);
176 dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n",
180 enable_irq_wake(irq);
183 err = nokia_modem_gpio_probe(dev);
185 dev_err(dev, "Could not probe GPIOs\n");
190 ssip.name = "ssi-protocol";
191 ssip.tx_cfg = cl->tx_cfg;
192 ssip.rx_cfg = cl->rx_cfg;
193 ssip.platform_data = NULL;
194 ssip.archdata = NULL;
196 modem->ssi_protocol = hsi_new_client(port, &ssip);
197 if (!modem->ssi_protocol) {
198 dev_err(dev, "Could not register ssi-protocol device\n");
203 err = device_attach(&modem->ssi_protocol->device);
205 dev_dbg(dev, "Missing ssi-protocol driver\n");
208 } else if (err < 0) {
209 dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err);
213 cmtspeech.name = "cmt-speech";
214 cmtspeech.tx_cfg = cl->tx_cfg;
215 cmtspeech.rx_cfg = cl->rx_cfg;
216 cmtspeech.platform_data = NULL;
217 cmtspeech.archdata = NULL;
219 modem->cmt_speech = hsi_new_client(port, &cmtspeech);
220 if (!modem->cmt_speech) {
221 dev_err(dev, "Could not register cmt-speech device\n");
226 err = device_attach(&modem->cmt_speech->device);
228 dev_dbg(dev, "Missing cmt-speech driver\n");
231 } else if (err < 0) {
232 dev_err(dev, "Could not load cmt-speech driver (%d)\n", err);
236 dev_info(dev, "Registered Nokia HSI modem\n");
241 hsi_remove_client(&modem->cmt_speech->device, NULL);
243 hsi_remove_client(&modem->ssi_protocol->device, NULL);
245 nokia_modem_gpio_unexport(dev);
247 disable_irq_wake(modem->nokia_modem_rst_ind_irq);
248 tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
253 static int nokia_modem_remove(struct device *dev)
255 struct nokia_modem_device *modem = dev_get_drvdata(dev);
260 if (modem->cmt_speech) {
261 hsi_remove_client(&modem->cmt_speech->device, NULL);
262 modem->cmt_speech = NULL;
265 if (modem->ssi_protocol) {
266 hsi_remove_client(&modem->ssi_protocol->device, NULL);
267 modem->ssi_protocol = NULL;
270 nokia_modem_gpio_unexport(dev);
271 dev_set_drvdata(dev, NULL);
272 disable_irq_wake(modem->nokia_modem_rst_ind_irq);
273 tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
279 static const struct of_device_id nokia_modem_of_match[] = {
280 { .compatible = "nokia,n900-modem", },
281 { .compatible = "nokia,n950-modem", },
282 { .compatible = "nokia,n9-modem", },
285 MODULE_DEVICE_TABLE(of, nokia_modem_of_match);
288 static struct hsi_client_driver nokia_modem_driver = {
290 .name = "nokia-modem",
291 .owner = THIS_MODULE,
292 .probe = nokia_modem_probe,
293 .remove = nokia_modem_remove,
294 .of_match_table = of_match_ptr(nokia_modem_of_match),
298 static int __init nokia_modem_init(void)
300 return hsi_register_client_driver(&nokia_modem_driver);
302 module_init(nokia_modem_init);
304 static void __exit nokia_modem_exit(void)
306 hsi_unregister_client_driver(&nokia_modem_driver);
308 module_exit(nokia_modem_exit);
310 MODULE_ALIAS("hsi:nokia-modem");
311 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
312 MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem");
313 MODULE_LICENSE("GPL");