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14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/gpio.h>
18#include <linux/of.h>
19#include <linux/of_gpio.h>
20#include <linux/spi/spi.h>
21#include <linux/spi/mmc_spi.h>
22#include <linux/mmc/core.h>
23#include <linux/mmc/host.h>
24
25enum {
26 CD_GPIO = 0,
27 WP_GPIO,
28 NUM_GPIOS,
29};
30
31struct of_mmc_spi {
32 int gpios[NUM_GPIOS];
33 bool alow_gpios[NUM_GPIOS];
34 struct mmc_spi_platform_data pdata;
35};
36
37static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
38{
39 return container_of(dev->platform_data, struct of_mmc_spi, pdata);
40}
41
42static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
43{
44 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
45 bool active_low = oms->alow_gpios[gpio_num];
46 bool value = gpio_get_value(oms->gpios[gpio_num]);
47
48 return active_low ^ value;
49}
50
51static int of_mmc_spi_get_cd(struct device *dev)
52{
53 return of_mmc_spi_read_gpio(dev, CD_GPIO);
54}
55
56static int of_mmc_spi_get_ro(struct device *dev)
57{
58 return of_mmc_spi_read_gpio(dev, WP_GPIO);
59}
60
61struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
62{
63 struct device *dev = &spi->dev;
64 struct device_node *np = dev_archdata_get_node(&dev->archdata);
65 struct of_mmc_spi *oms;
66 const u32 *voltage_ranges;
67 int num_ranges;
68 int i;
69 int ret = -EINVAL;
70
71 if (dev->platform_data || !np)
72 return dev->platform_data;
73
74 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
75 if (!oms)
76 return NULL;
77
78 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
79 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
80 if (!voltage_ranges || !num_ranges) {
81 dev_err(dev, "OF: voltage-ranges unspecified\n");
82 goto err_ocr;
83 }
84
85 for (i = 0; i < num_ranges; i++) {
86 const int j = i * 2;
87 u32 mask;
88
89 mask = mmc_vddrange_to_ocrmask(voltage_ranges[j],
90 voltage_ranges[j + 1]);
91 if (!mask) {
92 ret = -EINVAL;
93 dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
94 goto err_ocr;
95 }
96 oms->pdata.ocr_mask |= mask;
97 }
98
99 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
100 enum of_gpio_flags gpio_flags;
101
102 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
103 if (!gpio_is_valid(oms->gpios[i]))
104 continue;
105
106 ret = gpio_request(oms->gpios[i], dev_name(dev));
107 if (ret < 0) {
108 oms->gpios[i] = -EINVAL;
109 continue;
110 }
111
112 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
113 oms->alow_gpios[i] = true;
114 }
115
116 if (gpio_is_valid(oms->gpios[CD_GPIO]))
117 oms->pdata.get_cd = of_mmc_spi_get_cd;
118 if (gpio_is_valid(oms->gpios[WP_GPIO]))
119 oms->pdata.get_ro = of_mmc_spi_get_ro;
120
121
122 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
123
124 dev->platform_data = &oms->pdata;
125 return dev->platform_data;
126err_ocr:
127 kfree(oms);
128 return NULL;
129}
130EXPORT_SYMBOL(mmc_spi_get_pdata);
131
132void mmc_spi_put_pdata(struct spi_device *spi)
133{
134 struct device *dev = &spi->dev;
135 struct device_node *np = dev_archdata_get_node(&dev->archdata);
136 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
137 int i;
138
139 if (!dev->platform_data || !np)
140 return;
141
142 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
143 if (gpio_is_valid(oms->gpios[i]))
144 gpio_free(oms->gpios[i]);
145 }
146 kfree(oms);
147 dev->platform_data = NULL;
148}
149EXPORT_SYMBOL(mmc_spi_put_pdata);
150
