1 /*
2  *  Copyright (C) 2015 Samsung Electronics
3  *  Przemyslaw Marczak  <p.marczak@samsung.com>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <errno.h>
10 #include <dm.h>
11 #include <i2c.h>
12 #include <power/pmic.h>
13 #include <power/sandbox_pmic.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 /**
18  * struct sandbox_i2c_pmic_plat_data - platform data for the PMIC
19  *
20  * @rw_reg: PMICs register of the chip I/O transaction
21  * @reg:    PMICs registers array
22  */
23 struct sandbox_i2c_pmic_plat_data {
24 	u8 rw_reg;
25 	u8 reg[SANDBOX_PMIC_REG_COUNT];
26 };
27 
28 static int sandbox_i2c_pmic_read_data(struct udevice *emul, uchar chip,
29 				      uchar *buffer, int len)
30 {
31 	struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
32 
33 	if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
34 		pr_err("Request exceeds PMIC register range! Max register: %#x",
35 		      SANDBOX_PMIC_REG_COUNT);
36 		return -EFAULT;
37 	}
38 
39 	debug("Read PMIC: %#x at register: %#x count: %d\n",
40 	      (unsigned)chip & 0xff, plat->rw_reg, len);
41 
42 	memcpy(buffer, &plat->reg[plat->rw_reg], len);
43 
44 	return 0;
45 }
46 
47 static int sandbox_i2c_pmic_write_data(struct udevice *emul, uchar chip,
48 				       uchar *buffer, int len,
49 				       bool next_is_read)
50 {
51 	struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
52 
53 	/* Probe only */
54 	if (!len)
55 		return 0;
56 
57 	/* Set PMIC register for I/O */
58 	plat->rw_reg = *buffer;
59 
60 	debug("Write PMIC: %#x at register: %#x count: %d\n",
61 	      (unsigned)chip & 0xff, plat->rw_reg, len);
62 
63 	/* For read operation, set (write) only chip reg */
64 	if (next_is_read)
65 		return 0;
66 
67 	buffer++;
68 	len--;
69 
70 	if (plat->rw_reg + len > SANDBOX_PMIC_REG_COUNT) {
71 		pr_err("Request exceeds PMIC register range! Max register: %#x",
72 		      SANDBOX_PMIC_REG_COUNT);
73 	}
74 
75 	memcpy(&plat->reg[plat->rw_reg], buffer, len);
76 
77 	return 0;
78 }
79 
80 static int sandbox_i2c_pmic_xfer(struct udevice *emul, struct i2c_msg *msg,
81 				 int nmsgs)
82 {
83 	int ret = 0;
84 
85 	for (; nmsgs > 0; nmsgs--, msg++) {
86 		bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
87 		if (msg->flags & I2C_M_RD) {
88 			ret = sandbox_i2c_pmic_read_data(emul, msg->addr,
89 							 msg->buf, msg->len);
90 		} else {
91 			ret = sandbox_i2c_pmic_write_data(emul, msg->addr,
92 							  msg->buf, msg->len,
93 							  next_is_read);
94 		}
95 
96 		if (ret)
97 			break;
98 	}
99 
100 	return ret;
101 }
102 
103 static int sandbox_i2c_pmic_ofdata_to_platdata(struct udevice *emul)
104 {
105 	struct sandbox_i2c_pmic_plat_data *plat = dev_get_platdata(emul);
106 	const u8 *reg_defaults;
107 
108 	debug("%s:%d Setting PMIC default registers\n", __func__, __LINE__);
109 
110 	reg_defaults = dev_read_u8_array_ptr(emul, "reg-defaults",
111 					     SANDBOX_PMIC_REG_COUNT);
112 
113 	if (!reg_defaults) {
114 		pr_err("Property \"reg-defaults\" not found for device: %s!",
115 		      emul->name);
116 		return -EINVAL;
117 	}
118 
119 	memcpy(&plat->reg, reg_defaults, SANDBOX_PMIC_REG_COUNT);
120 
121 	return 0;
122 }
123 
124 struct dm_i2c_ops sandbox_i2c_pmic_emul_ops = {
125 	.xfer = sandbox_i2c_pmic_xfer,
126 };
127 
128 static const struct udevice_id sandbox_i2c_pmic_ids[] = {
129 	{ .compatible = "sandbox,i2c-pmic" },
130 	{ }
131 };
132 
133 U_BOOT_DRIVER(sandbox_i2c_pmic_emul) = {
134 	.name		= "sandbox_i2c_pmic_emul",
135 	.id		= UCLASS_I2C_EMUL,
136 	.of_match	= sandbox_i2c_pmic_ids,
137 	.ofdata_to_platdata = sandbox_i2c_pmic_ofdata_to_platdata,
138 	.platdata_auto_alloc_size = sizeof(struct sandbox_i2c_pmic_plat_data),
139 	.ops		= &sandbox_i2c_pmic_emul_ops,
140 };
141