1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2019-2022, The Linux Foundation. All rights reserved. |
4 | * Copyright (c) 2023, Linaro Ltd |
5 | */ |
6 | #include <linux/of_device.h> |
7 | #include <linux/module.h> |
8 | #include <linux/platform_device.h> |
9 | #include <linux/rpmsg.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/soc/qcom/pdr.h> |
12 | #include <linux/debugfs.h> |
13 | |
14 | #define CREATE_TRACE_POINTS |
15 | #include "pmic_pdcharger_ulog.h" |
16 | |
17 | #define MSG_OWNER_CHG_ULOG 32778 |
18 | #define MSG_TYPE_REQ_RESP 1 |
19 | |
20 | #define GET_CHG_ULOG_REQ 0x18 |
21 | #define SET_CHG_ULOG_PROP_REQ 0x19 |
22 | |
23 | #define LOG_DEFAULT_TIME_MS 1000 |
24 | |
25 | #define MAX_ULOG_SIZE 8192 |
26 | |
27 | struct pmic_pdcharger_ulog_hdr { |
28 | __le32 owner; |
29 | __le32 type; |
30 | __le32 opcode; |
31 | }; |
32 | |
33 | struct pmic_pdcharger_ulog { |
34 | struct rpmsg_device *rpdev; |
35 | struct delayed_work ulog_work; |
36 | }; |
37 | |
38 | struct get_ulog_req_msg { |
39 | struct pmic_pdcharger_ulog_hdr hdr; |
40 | u32 log_size; |
41 | }; |
42 | |
43 | struct get_ulog_resp_msg { |
44 | struct pmic_pdcharger_ulog_hdr hdr; |
45 | u8 buf[MAX_ULOG_SIZE]; |
46 | }; |
47 | |
48 | static int pmic_pdcharger_ulog_write_async(struct pmic_pdcharger_ulog *pg, void *data, size_t len) |
49 | { |
50 | return rpmsg_send(ept: pg->rpdev->ept, data, len); |
51 | } |
52 | |
53 | static int pmic_pdcharger_ulog_request(struct pmic_pdcharger_ulog *pg) |
54 | { |
55 | struct get_ulog_req_msg req_msg = { |
56 | .hdr = { |
57 | .owner = cpu_to_le32(MSG_OWNER_CHG_ULOG), |
58 | .type = cpu_to_le32(MSG_TYPE_REQ_RESP), |
59 | .opcode = cpu_to_le32(GET_CHG_ULOG_REQ) |
60 | }, |
61 | .log_size = MAX_ULOG_SIZE |
62 | }; |
63 | |
64 | return pmic_pdcharger_ulog_write_async(pg, data: &req_msg, len: sizeof(req_msg)); |
65 | } |
66 | |
67 | static void pmic_pdcharger_ulog_work(struct work_struct *work) |
68 | { |
69 | struct pmic_pdcharger_ulog *pg = container_of(work, struct pmic_pdcharger_ulog, |
70 | ulog_work.work); |
71 | int rc; |
72 | |
73 | rc = pmic_pdcharger_ulog_request(pg); |
74 | if (rc) { |
75 | dev_err(&pg->rpdev->dev, "Error requesting ulog, rc=%d\n" , rc); |
76 | return; |
77 | } |
78 | } |
79 | |
80 | static void pmic_pdcharger_ulog_handle_message(struct pmic_pdcharger_ulog *pg, |
81 | struct get_ulog_resp_msg *resp_msg, |
82 | size_t len) |
83 | { |
84 | char *token, *buf = resp_msg->buf; |
85 | |
86 | if (len != sizeof(*resp_msg)) { |
87 | dev_err(&pg->rpdev->dev, "Expected data length: %zu, received: %zu\n" , |
88 | sizeof(*resp_msg), len); |
89 | return; |
90 | } |
91 | |
92 | buf[MAX_ULOG_SIZE - 1] = '\0'; |
93 | |
94 | do { |
95 | token = strsep((char **)&buf, "\n" ); |
96 | if (token && strlen(token)) |
97 | trace_pmic_pdcharger_ulog_msg(msg: token); |
98 | } while (token); |
99 | } |
100 | |
101 | static int pmic_pdcharger_ulog_rpmsg_callback(struct rpmsg_device *rpdev, void *data, |
102 | int len, void *priv, u32 addr) |
103 | { |
104 | struct pmic_pdcharger_ulog *pg = dev_get_drvdata(dev: &rpdev->dev); |
105 | struct pmic_pdcharger_ulog_hdr *hdr = data; |
106 | u32 opcode; |
107 | |
108 | opcode = le32_to_cpu(hdr->opcode); |
109 | |
110 | switch (opcode) { |
111 | case GET_CHG_ULOG_REQ: |
112 | schedule_delayed_work(dwork: &pg->ulog_work, delay: msecs_to_jiffies(LOG_DEFAULT_TIME_MS)); |
113 | pmic_pdcharger_ulog_handle_message(pg, resp_msg: data, len); |
114 | break; |
115 | default: |
116 | dev_err(&pg->rpdev->dev, "Unknown opcode %u\n" , opcode); |
117 | break; |
118 | } |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | static int pmic_pdcharger_ulog_rpmsg_probe(struct rpmsg_device *rpdev) |
124 | { |
125 | struct pmic_pdcharger_ulog *pg; |
126 | struct device *dev = &rpdev->dev; |
127 | |
128 | pg = devm_kzalloc(dev, size: sizeof(*pg), GFP_KERNEL); |
129 | if (!pg) |
130 | return -ENOMEM; |
131 | |
132 | pg->rpdev = rpdev; |
133 | INIT_DELAYED_WORK(&pg->ulog_work, pmic_pdcharger_ulog_work); |
134 | |
135 | dev_set_drvdata(dev, data: pg); |
136 | |
137 | pmic_pdcharger_ulog_request(pg); |
138 | |
139 | return 0; |
140 | } |
141 | |
142 | static void pmic_pdcharger_ulog_rpmsg_remove(struct rpmsg_device *rpdev) |
143 | { |
144 | struct pmic_pdcharger_ulog *pg = dev_get_drvdata(dev: &rpdev->dev); |
145 | |
146 | cancel_delayed_work_sync(dwork: &pg->ulog_work); |
147 | } |
148 | |
149 | static const struct rpmsg_device_id pmic_pdcharger_ulog_rpmsg_id_match[] = { |
150 | { "PMIC_LOGS_ADSP_APPS" }, |
151 | {} |
152 | }; |
153 | |
154 | static struct rpmsg_driver pmic_pdcharger_ulog_rpmsg_driver = { |
155 | .probe = pmic_pdcharger_ulog_rpmsg_probe, |
156 | .remove = pmic_pdcharger_ulog_rpmsg_remove, |
157 | .callback = pmic_pdcharger_ulog_rpmsg_callback, |
158 | .id_table = pmic_pdcharger_ulog_rpmsg_id_match, |
159 | .drv = { |
160 | .name = "qcom_pmic_pdcharger_ulog_rpmsg" , |
161 | }, |
162 | }; |
163 | |
164 | module_rpmsg_driver(pmic_pdcharger_ulog_rpmsg_driver); |
165 | MODULE_DESCRIPTION("Qualcomm PMIC ChargerPD ULOG driver" ); |
166 | MODULE_LICENSE("GPL" ); |
167 | |