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23#include <linux/gpio/consumer.h>
24#include <linux/hsi/hsi.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/of.h>
28#include <linux/of_irq.h>
29#include <linux/of_gpio.h>
30#include <linux/hsi/ssi_protocol.h>
31
32static unsigned int pm = 1;
33module_param(pm, int, 0400);
34MODULE_PARM_DESC(pm,
35 "Enable power management (0=disabled, 1=userland based [default])");
36
37struct nokia_modem_gpio {
38 struct gpio_desc *gpio;
39 const char *name;
40};
41
42struct 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;
47 int gpio_amount;
48 struct hsi_client *ssi_protocol;
49 struct hsi_client *cmt_speech;
50};
51
52static void do_nokia_modem_rst_ind_tasklet(unsigned long data)
53{
54 struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
55
56 if (!modem)
57 return;
58
59 dev_info(modem->device, "CMT rst line change detected\n");
60
61 if (modem->ssi_protocol)
62 ssip_reset_event(modem->ssi_protocol);
63}
64
65static irqreturn_t nokia_modem_rst_ind_isr(int irq, void *data)
66{
67 struct nokia_modem_device *modem = (struct nokia_modem_device *)data;
68
69 tasklet_schedule(&modem->nokia_modem_rst_ind_tasklet);
70
71 return IRQ_HANDLED;
72}
73
74static void nokia_modem_gpio_unexport(struct device *dev)
75{
76 struct nokia_modem_device *modem = dev_get_drvdata(dev);
77 int i;
78
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);
82 }
83}
84
85static int nokia_modem_gpio_probe(struct device *dev)
86{
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;
90
91 gpio_count = of_gpio_count(np);
92
93 if (gpio_count < 0) {
94 dev_err(dev, "missing gpios: %d\n", gpio_count);
95 return gpio_count;
96 }
97
98 gpio_name_count = of_property_count_strings(np, "gpio-names");
99
100 if (gpio_count != gpio_name_count) {
101 dev_err(dev, "number of gpios does not equal number of gpio names\n");
102 return -EINVAL;
103 }
104
105 modem->gpios = devm_kcalloc(dev, gpio_count, sizeof(*modem->gpios),
106 GFP_KERNEL);
107 if (!modem->gpios)
108 return -ENOMEM;
109
110 modem->gpio_amount = gpio_count;
111
112 for (i = 0; i < gpio_count; i++) {
113 modem->gpios[i].gpio = devm_gpiod_get_index(dev, NULL, i,
114 GPIOD_OUT_LOW);
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);
118 }
119
120 err = of_property_read_string_index(np, "gpio-names", i,
121 &(modem->gpios[i].name));
122 if (err) {
123 dev_err(dev, "Could not get gpio name %d\n", i);
124 return err;
125 }
126
127 err = gpiod_export(modem->gpios[i].gpio, 0);
128 if (err)
129 return err;
130
131 err = gpiod_export_link(dev, modem->gpios[i].name,
132 modem->gpios[i].gpio);
133 if (err)
134 return err;
135 }
136
137 return 0;
138}
139
140static int nokia_modem_probe(struct device *dev)
141{
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;
149
150 np = dev->of_node;
151 if (!np) {
152 dev_err(dev, "device tree node not found\n");
153 return -ENXIO;
154 }
155
156 modem = devm_kzalloc(dev, sizeof(*modem), GFP_KERNEL);
157 if (!modem)
158 return -ENOMEM;
159
160 dev_set_drvdata(dev, modem);
161 modem->device = dev;
162
163 irq = irq_of_parse_and_map(np, 0);
164 if (!irq) {
165 dev_err(dev, "Invalid rst_ind interrupt (%d)\n", irq);
166 return -EINVAL;
167 }
168 modem->nokia_modem_rst_ind_irq = irq;
169 pflags = irq_get_trigger_type(irq);
170
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);
175 if (err < 0) {
176 dev_err(dev, "Request rst_ind irq(%d) failed (flags %d)\n",
177 irq, pflags);
178 return err;
179 }
180 enable_irq_wake(irq);
181
182 if (pm) {
183 err = nokia_modem_gpio_probe(dev);
184 if (err < 0) {
185 dev_err(dev, "Could not probe GPIOs\n");
186 goto error1;
187 }
188 }
189
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;
195
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");
199 err = -ENOMEM;
200 goto error2;
201 }
202
203 err = device_attach(&modem->ssi_protocol->device);
204 if (err == 0) {
205 dev_dbg(dev, "Missing ssi-protocol driver\n");
206 err = -EPROBE_DEFER;
207 goto error3;
208 } else if (err < 0) {
209 dev_err(dev, "Could not load ssi-protocol driver (%d)\n", err);
210 goto error3;
211 }
212
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;
218
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");
222 err = -ENOMEM;
223 goto error3;
224 }
225
226 err = device_attach(&modem->cmt_speech->device);
227 if (err == 0) {
228 dev_dbg(dev, "Missing cmt-speech driver\n");
229 err = -EPROBE_DEFER;
230 goto error4;
231 } else if (err < 0) {
232 dev_err(dev, "Could not load cmt-speech driver (%d)\n", err);
233 goto error4;
234 }
235
236 dev_info(dev, "Registered Nokia HSI modem\n");
237
238 return 0;
239
240error4:
241 hsi_remove_client(&modem->cmt_speech->device, NULL);
242error3:
243 hsi_remove_client(&modem->ssi_protocol->device, NULL);
244error2:
245 nokia_modem_gpio_unexport(dev);
246error1:
247 disable_irq_wake(modem->nokia_modem_rst_ind_irq);
248 tasklet_kill(&modem->nokia_modem_rst_ind_tasklet);
249
250 return err;
251}
252
253static int nokia_modem_remove(struct device *dev)
254{
255 struct nokia_modem_device *modem = dev_get_drvdata(dev);
256
257 if (!modem)
258 return 0;
259
260 if (modem->cmt_speech) {
261 hsi_remove_client(&modem->cmt_speech->device, NULL);
262 modem->cmt_speech = NULL;
263 }
264
265 if (modem->ssi_protocol) {
266 hsi_remove_client(&modem->ssi_protocol->device, NULL);
267 modem->ssi_protocol = NULL;
268 }
269
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);
274
275 return 0;
276}
277
278#ifdef CONFIG_OF
279static const struct of_device_id nokia_modem_of_match[] = {
280 { .compatible = "nokia,n900-modem", },
281 { .compatible = "nokia,n950-modem", },
282 { .compatible = "nokia,n9-modem", },
283 {},
284};
285MODULE_DEVICE_TABLE(of, nokia_modem_of_match);
286#endif
287
288static struct hsi_client_driver nokia_modem_driver = {
289 .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),
295 },
296};
297
298static int __init nokia_modem_init(void)
299{
300 return hsi_register_client_driver(&nokia_modem_driver);
301}
302module_init(nokia_modem_init);
303
304static void __exit nokia_modem_exit(void)
305{
306 hsi_unregister_client_driver(&nokia_modem_driver);
307}
308module_exit(nokia_modem_exit);
309
310MODULE_ALIAS("hsi:nokia-modem");
311MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
312MODULE_DESCRIPTION("HSI driver module for Nokia N900 Modem");
313MODULE_LICENSE("GPL");
314
