1
2
3
4
5
6
7
8
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/pwm.h>
14
15#include "greybus.h"
16#include "gbphy.h"
17
18struct gb_pwm_chip {
19 struct gb_connection *connection;
20 u8 pwm_max;
21
22 struct pwm_chip chip;
23 struct pwm_chip *pwm;
24};
25#define pwm_chip_to_gb_pwm_chip(chip) \
26 container_of(chip, struct gb_pwm_chip, chip)
27
28
29static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc)
30{
31 struct gb_pwm_count_response response;
32 int ret;
33
34 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_PWM_COUNT,
35 NULL, 0, &response, sizeof(response));
36 if (ret)
37 return ret;
38 pwmc->pwm_max = response.count;
39 return 0;
40}
41
42static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc,
43 u8 which)
44{
45 struct gb_pwm_activate_request request;
46 struct gbphy_device *gbphy_dev;
47 int ret;
48
49 if (which > pwmc->pwm_max)
50 return -EINVAL;
51
52 request.which = which;
53
54 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
55 ret = gbphy_runtime_get_sync(gbphy_dev);
56 if (ret)
57 return ret;
58
59 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ACTIVATE,
60 &request, sizeof(request), NULL, 0);
61
62 gbphy_runtime_put_autosuspend(gbphy_dev);
63
64 return ret;
65}
66
67static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc,
68 u8 which)
69{
70 struct gb_pwm_deactivate_request request;
71 struct gbphy_device *gbphy_dev;
72 int ret;
73
74 if (which > pwmc->pwm_max)
75 return -EINVAL;
76
77 request.which = which;
78
79 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
80 ret = gbphy_runtime_get_sync(gbphy_dev);
81 if (ret)
82 return ret;
83
84 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DEACTIVATE,
85 &request, sizeof(request), NULL, 0);
86
87 gbphy_runtime_put_autosuspend(gbphy_dev);
88
89 return ret;
90}
91
92static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc,
93 u8 which, u32 duty, u32 period)
94{
95 struct gb_pwm_config_request request;
96 struct gbphy_device *gbphy_dev;
97 int ret;
98
99 if (which > pwmc->pwm_max)
100 return -EINVAL;
101
102 request.which = which;
103 request.duty = cpu_to_le32(duty);
104 request.period = cpu_to_le32(period);
105
106 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
107 ret = gbphy_runtime_get_sync(gbphy_dev);
108 if (ret)
109 return ret;
110
111 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_CONFIG,
112 &request, sizeof(request), NULL, 0);
113
114 gbphy_runtime_put_autosuspend(gbphy_dev);
115
116 return ret;
117}
118
119static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc,
120 u8 which, u8 polarity)
121{
122 struct gb_pwm_polarity_request request;
123 struct gbphy_device *gbphy_dev;
124 int ret;
125
126 if (which > pwmc->pwm_max)
127 return -EINVAL;
128
129 request.which = which;
130 request.polarity = polarity;
131
132 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
133 ret = gbphy_runtime_get_sync(gbphy_dev);
134 if (ret)
135 return ret;
136
137 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_POLARITY,
138 &request, sizeof(request), NULL, 0);
139
140 gbphy_runtime_put_autosuspend(gbphy_dev);
141
142 return ret;
143}
144
145static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc,
146 u8 which)
147{
148 struct gb_pwm_enable_request request;
149 struct gbphy_device *gbphy_dev;
150 int ret;
151
152 if (which > pwmc->pwm_max)
153 return -EINVAL;
154
155 request.which = which;
156
157 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
158 ret = gbphy_runtime_get_sync(gbphy_dev);
159 if (ret)
160 return ret;
161
162 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ENABLE,
163 &request, sizeof(request), NULL, 0);
164 if (ret)
165 gbphy_runtime_put_autosuspend(gbphy_dev);
166
167 return ret;
168}
169
170static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc,
171 u8 which)
172{
173 struct gb_pwm_disable_request request;
174 struct gbphy_device *gbphy_dev;
175 int ret;
176
177 if (which > pwmc->pwm_max)
178 return -EINVAL;
179
180 request.which = which;
181
182 ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DISABLE,
183 &request, sizeof(request), NULL, 0);
184
185 gbphy_dev = to_gbphy_dev(pwmc->chip.dev);
186 gbphy_runtime_put_autosuspend(gbphy_dev);
187
188 return ret;
189}
190
191static int gb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
192{
193 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
194
195 return gb_pwm_activate_operation(pwmc, pwm->hwpwm);
196};
197
198static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
199{
200 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
201
202 if (pwm_is_enabled(pwm))
203 dev_warn(chip->dev, "freeing PWM device without disabling\n");
204
205 gb_pwm_deactivate_operation(pwmc, pwm->hwpwm);
206}
207
208static int gb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
209 int duty_ns, int period_ns)
210{
211 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
212
213 return gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_ns, period_ns);
214};
215
216static int gb_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
217 enum pwm_polarity polarity)
218{
219 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
220
221 return gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, polarity);
222};
223
224static int gb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
225{
226 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
227
228 return gb_pwm_enable_operation(pwmc, pwm->hwpwm);
229};
230
231static void gb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
232{
233 struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
234
235 gb_pwm_disable_operation(pwmc, pwm->hwpwm);
236};
237
238static const struct pwm_ops gb_pwm_ops = {
239 .request = gb_pwm_request,
240 .free = gb_pwm_free,
241 .config = gb_pwm_config,
242 .set_polarity = gb_pwm_set_polarity,
243 .enable = gb_pwm_enable,
244 .disable = gb_pwm_disable,
245 .owner = THIS_MODULE,
246};
247
248static int gb_pwm_probe(struct gbphy_device *gbphy_dev,
249 const struct gbphy_device_id *id)
250{
251 struct gb_connection *connection;
252 struct gb_pwm_chip *pwmc;
253 struct pwm_chip *pwm;
254 int ret;
255
256 pwmc = kzalloc(sizeof(*pwmc), GFP_KERNEL);
257 if (!pwmc)
258 return -ENOMEM;
259
260 connection = gb_connection_create(gbphy_dev->bundle,
261 le16_to_cpu(gbphy_dev->cport_desc->id),
262 NULL);
263 if (IS_ERR(connection)) {
264 ret = PTR_ERR(connection);
265 goto exit_pwmc_free;
266 }
267
268 pwmc->connection = connection;
269 gb_connection_set_data(connection, pwmc);
270 gb_gbphy_set_data(gbphy_dev, pwmc);
271
272 ret = gb_connection_enable(connection);
273 if (ret)
274 goto exit_connection_destroy;
275
276
277 ret = gb_pwm_count_operation(pwmc);
278 if (ret)
279 goto exit_connection_disable;
280
281 pwm = &pwmc->chip;
282
283 pwm->dev = &gbphy_dev->dev;
284 pwm->ops = &gb_pwm_ops;
285 pwm->base = -1;
286 pwm->npwm = pwmc->pwm_max + 1;
287
288 ret = pwmchip_add(pwm);
289 if (ret) {
290 dev_err(&gbphy_dev->dev,
291 "failed to register PWM: %d\n", ret);
292 goto exit_connection_disable;
293 }
294
295 gbphy_runtime_put_autosuspend(gbphy_dev);
296 return 0;
297
298exit_connection_disable:
299 gb_connection_disable(connection);
300exit_connection_destroy:
301 gb_connection_destroy(connection);
302exit_pwmc_free:
303 kfree(pwmc);
304 return ret;
305}
306
307static void gb_pwm_remove(struct gbphy_device *gbphy_dev)
308{
309 struct gb_pwm_chip *pwmc = gb_gbphy_get_data(gbphy_dev);
310 struct gb_connection *connection = pwmc->connection;
311 int ret;
312
313 ret = gbphy_runtime_get_sync(gbphy_dev);
314 if (ret)
315 gbphy_runtime_get_noresume(gbphy_dev);
316
317 pwmchip_remove(&pwmc->chip);
318 gb_connection_disable(connection);
319 gb_connection_destroy(connection);
320 kfree(pwmc);
321}
322
323static const struct gbphy_device_id gb_pwm_id_table[] = {
324 { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_PWM) },
325 { },
326};
327MODULE_DEVICE_TABLE(gbphy, gb_pwm_id_table);
328
329static struct gbphy_driver pwm_driver = {
330 .name = "pwm",
331 .probe = gb_pwm_probe,
332 .remove = gb_pwm_remove,
333 .id_table = gb_pwm_id_table,
334};
335
336module_gbphy_driver(pwm_driver);
337MODULE_LICENSE("GPL v2");
338
